{"id":25741,"date":"2025-11-12T12:32:06","date_gmt":"2025-11-12T11:32:06","guid":{"rendered":"https:\/\/bgz.de\/?page_id=25741"},"modified":"2026-04-29T12:34:44","modified_gmt":"2026-04-29T10:34:44","slug":"mstor-long-term-behaviour-of-metal-seals","status":"publish","type":"page","link":"https:\/\/bgz.de\/en\/mstor-long-term-behaviour-of-metal-seals\/","title":{"rendered":"MSTOR \u2013 Long-term behaviour of metal seals"},"content":{"rendered":"\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-w4vtr1-c0f96300ee944d7ac1521cd1d0213d0c\">\n.avia-section.av-w4vtr1-c0f96300ee944d7ac1521cd1d0213d0c{\nbackground-color:#0d57a0;\nbackground-image:unset;\n}\n<\/style>\n<div id='headerpetrol'  class='avia-section av-w4vtr1-c0f96300ee944d7ac1521cd1d0213d0c main_color avia-section-default avia-no-border-styling  avia-builder-el-0  el_before_av_codeblock  avia-builder-el-first  avia-bg-style-scroll container_wrap sidebar_right'  ><div class='container av-section-cont-open' ><main  role=\"main\" itemprop=\"mainContentOfPage\"  class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-25741'><div class='entry-content-wrapper clearfix'>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-m8oi00o9-f1baeb38fc0d698a22a4ef99caaf4eb4\">\n.av_textblock_section.av-m8oi00o9-f1baeb38fc0d698a22a4ef99caaf4eb4{\nbackground-color:#0d57a0;\n}\n#top .av_textblock_section.av-m8oi00o9-f1baeb38fc0d698a22a4ef99caaf4eb4 .avia_textblock{\ncolor:#ffffff;\n}\n<\/style>\n<section  class='av_textblock_section av-m8oi00o9-f1baeb38fc0d698a22a4ef99caaf4eb4 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><h1 class=\"h3gestaltung\"><strong>MSTOR \u2013 Long-term behaviour of metal seals<\/strong><\/h1>\n<\/div><\/section>\n<\/div><\/div><\/main><!-- close content main element --><\/div><\/div><div id='after_section_1'  class='main_color av_default_container_wrap container_wrap sidebar_right'  ><div class='container av-section-cont-open' ><div class='template-page content  av-content-small alpha units'><div class='post-entry post-entry-type-page post-entry-25741'><div class='entry-content-wrapper clearfix'>\n\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-2upq1p-f9c078ecbc5533a06891da754eb514b7\">\n#top .hr.hr-invisible.av-2upq1p-f9c078ecbc5533a06891da754eb514b7{\nheight:30px;\n}\n<\/style>\n<div  class='hr av-2upq1p-f9c078ecbc5533a06891da754eb514b7 hr-invisible  avia-builder-el-3  el_after_av_codeblock  el_before_av_textblock '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<section  class='av_textblock_section av-6oeddkt-ad70972e3305fd5720e199a85422d4a2 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><div class=\"anleser\">Safe confinement of radioactive materials during storage is ensured by the double-lid sealing system with compressed metal seals.<\/div>\n<p>Only Helicoflex<sup>\u00ae<\/sup> metal seals made by the French manufacturer Technetics are used in the sealing barrier. Helicoflex<sup>\u00ae<\/sup> type seals consist of a helical spring core and a stainless steel jacket covered by an outer liner made of aluminium or silver. The functioning of the seals is based on the elasticity of the helical spring (see Figure 3) that, when compressed, generates the restoring force that is necessary to maintain contact between the outer liner and the sealing surfaces. The plasticity of the outer liner also ensures that the surface of the seal is optimally adapted to the structure of the sealing surface. During compression, the liner material fills the flange imperfections in order to achieve a high degree of tightness with standard He leak rates of less than 10<sup>-8<\/sup> Pa m3\/s. The stipulated standard He leak rate of 10<sup>-8<\/sup> Pa m3\/s is therefore also a system-specific quality criterion for the required long-term functionality and is not a radiologically based tightness requirement, as this could also be met at higher leak rates.<\/p>\n<\/div><\/section>\n<div class='flex_column_table av-3vq9p5p-cf3cfa34d637cc539362a3199aef3ade sc-av_two_third av-equal-height-column-flextable'><div  class='flex_column av-3vq9p5p-cf3cfa34d637cc539362a3199aef3ade av_two_third  avia-builder-el-5  el_after_av_textblock  el_before_av_one_third  first flex_column_table_cell av-equal-height-column av-align-top  column-top-margin'     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-3ftp4ot-fb3468952673358c3473462e756f8be1\">\n.avia-image-container.av-3ftp4ot-fb3468952673358c3473462e756f8be1 img.avia_image{\nbox-shadow:none;\n}\n.avia-image-container.av-3ftp4ot-fb3468952673358c3473462e756f8be1 .av-image-caption-overlay-center{\ncolor:#ffffff;\n}\n<\/style>\n<div  class='avia-image-container av-3ftp4ot-fb3468952673358c3473462e756f8be1 av-styling- avia-align-center  avia-builder-el-6  avia-builder-el-no-sibling '   itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\" ><div class=\"avia-image-container-inner\"><div class=\"avia-image-overlay-wrap\"><img decoding=\"async\" fetchpriority=\"high\" class='wp-image-13221 avia-img-lazy-loading-not-13221 avia_image ' src=\"https:\/\/bgz.de\/wp-content\/uploads\/2022\/11\/221027_BGZ_Forschungsprogramm_19_Abb18-1.png\" alt='' title='221027_BGZ_Forschungsprogramm_19_Abb18'  height=\"675\" width=\"1307\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/bgz.de\/wp-content\/uploads\/2022\/11\/221027_BGZ_Forschungsprogramm_19_Abb18-1.png 1307w, https:\/\/bgz.de\/wp-content\/uploads\/2022\/11\/221027_BGZ_Forschungsprogramm_19_Abb18-1-300x155.png 300w, https:\/\/bgz.de\/wp-content\/uploads\/2022\/11\/221027_BGZ_Forschungsprogramm_19_Abb18-1-1030x532.png 1030w, https:\/\/bgz.de\/wp-content\/uploads\/2022\/11\/221027_BGZ_Forschungsprogramm_19_Abb18-1-768x397.png 768w, https:\/\/bgz.de\/wp-content\/uploads\/2022\/11\/221027_BGZ_Forschungsprogramm_19_Abb18-1-705x364.png 705w\" sizes=\"(max-width: 1307px) 100vw, 1307px\" \/><\/div><\/div><\/div><\/div>\n<div class='av-flex-placeholder'><\/div><div  class='flex_column av-5vnfkpp-4b38439327d1d7164c2af47f747a0ad0 av_one_third  avia-builder-el-7  el_after_av_two_third  el_before_av_hr  flex_column_table_cell av-equal-height-column av-align-top  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-5cixwrh-944fd4c6571e48319f4654ade96ceb94\">\n#top .hr.av-5cixwrh-944fd4c6571e48319f4654ade96ceb94{\nmargin-top:30px;\nmargin-bottom:30px;\n}\n.hr.av-5cixwrh-944fd4c6571e48319f4654ade96ceb94 .hr-inner{\nwidth:100px;\nborder-color:#0d57a0;\n}\n<\/style>\n<div  class='hr av-5cixwrh-944fd4c6571e48319f4654ade96ceb94 hr-custom  avia-builder-el-8  el_before_av_textblock  avia-builder-el-first  hr-left hr-icon-no'><span class='hr-inner inner-border-av-border-fat'><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-rsf3z1-9782591e931f6a0e77e99dd2ff0f3df6\">\n#top .av_textblock_section.av-rsf3z1-9782591e931f6a0e77e99dd2ff0f3df6 .avia_textblock{\ncolor:#0d57a0;\n}\n<\/style>\n<section  class='av_textblock_section av-rsf3z1-9782591e931f6a0e77e99dd2ff0f3df6 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p><em>Figure 3:<br \/>\nFunctionality of Helicoflex<sup>\u00ae<\/sup> metal seals<br \/>\n<\/em><\/p>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1iyrbx-370508f7468f8bd8244ddd044339bb56\">\n#top .hr.av-1iyrbx-370508f7468f8bd8244ddd044339bb56{\nmargin-top:30px;\nmargin-bottom:30px;\n}\n.hr.av-1iyrbx-370508f7468f8bd8244ddd044339bb56 .hr-inner{\nwidth:100px;\nborder-color:#0d57a0;\n}\n<\/style>\n<div  class='hr av-1iyrbx-370508f7468f8bd8244ddd044339bb56 hr-custom  avia-builder-el-10  el_after_av_textblock  avia-builder-el-last  hr-left hr-icon-no'><span class='hr-inner inner-border-av-border-fat'><span class=\"hr-inner-style\"><\/span><\/span><\/div><\/p><\/div><\/div><!--close column table wrapper. Autoclose: 1 -->\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-32i2br1-c40e5c6217558c6f9448c0a39923b40b\">\n#top .hr.hr-invisible.av-32i2br1-c40e5c6217558c6f9448c0a39923b40b{\nheight:50px;\n}\n<\/style>\n<div  class='hr av-32i2br1-c40e5c6217558c6f9448c0a39923b40b hr-invisible  avia-builder-el-11  el_after_av_one_third  el_before_av_textblock '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<section  class='av_textblock_section av-mhezwlo2-8e294fe0295b934eec24fe44bb11c0fb '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p>During initial compression of the metal seal, a force-deformation curve is obtained as shown in Figure 4. At deformation e<sub>0<\/sub>, the required tightness is achieved for the first time, but only at deformation e<sub>2<\/sub> is the seal at its operating point. The seal is compressed to the operating point thanks to the depth of the groove in which the seal is inserted in the lid, as the difference between the groove depth and the torus diameter of the seal corresponds exactly to the optimum compression e<sub>2<\/sub>.<\/p>\n<p>If the seal is decompressed as a result of external loads, i.e. if a gap emerges between the lid and the mating surface, the required tightness is maintained until e1 is reached. The permissible gap between the sealing surface and the lid corresponds to the useful elastic recovery ru (see Figure 4). In particular, this parameter and the associated force Y<sub>1<\/sub> are essential for evaluating the behaviour of the metal seal under operating and accident conditions.<\/p>\n<p>In the assembly state, mechanical stress and temperature exposure lead to creep processes in the metal seal. These become noticeable in the form of relaxation. As shown in Figure 4, relaxation decreases the restoring force at the operating point to Y<sub>2r<\/sub> with unchanged deformation. Although the minimum force required to maintain the specified tightness Y<sub>1r<\/sub> decreases upon decompression, the deformation e<sub>1r<\/sub> also decreases accordingly, so that the remaining useful recovery rur for an aged seal decreases considerably compared to the assembly state.<\/p>\n<p>Knowledge of the characteristic values Y<sub>1r<\/sub> and r<sub>ur<\/sub> of an aged seal is therefore of great importance to reliably evaluate the long-term behaviour of the metal seals. In particular, the remaining useful recovery r<sub>ur<\/sub> is a measure for assessing the robustness of the sealing barrier, i.e. the extent to which the seal is able to maintain the required tightness even under external mechanical influences.<\/p>\n<\/div><\/section>\n<div class='flex_column_table av-6cnczpp-1de365737a9a04dbc17ca4768b4c3d39 sc-av_three_fourth av-equal-height-column-flextable'><div  class='flex_column av-6cnczpp-1de365737a9a04dbc17ca4768b4c3d39 av_three_fourth  avia-builder-el-13  el_after_av_textblock  el_before_av_one_fourth  first flex_column_table_cell av-equal-height-column av-align-top  column-top-margin'     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mhf0er01-6453622fbcf0c28e1c7fcf2a0197644c\">\n.avia-image-container.av-mhf0er01-6453622fbcf0c28e1c7fcf2a0197644c img.avia_image{\nbox-shadow:none;\n}\n.avia-image-container.av-mhf0er01-6453622fbcf0c28e1c7fcf2a0197644c .av-image-caption-overlay-center{\ncolor:#ffffff;\n}\n<\/style>\n<div  class='avia-image-container av-mhf0er01-6453622fbcf0c28e1c7fcf2a0197644c av-styling- avia-align-center  avia-builder-el-14  avia-builder-el-no-sibling '   itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\" ><div class=\"avia-image-container-inner\"><div class=\"avia-image-overlay-wrap\"><img decoding=\"async\" fetchpriority=\"high\" class='wp-image-13223 avia-img-lazy-loading-not-13223 avia_image ' src=\"https:\/\/bgz.de\/wp-content\/uploads\/2022\/11\/221027_BGZ_Forschungsprogramm_20_Abb19-1.png\" alt='' title='221027_BGZ_Forschungsprogramm_20_Abb19'  height=\"774\" width=\"1000\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/bgz.de\/wp-content\/uploads\/2022\/11\/221027_BGZ_Forschungsprogramm_20_Abb19-1.png 1000w, https:\/\/bgz.de\/wp-content\/uploads\/2022\/11\/221027_BGZ_Forschungsprogramm_20_Abb19-1-300x232.png 300w, https:\/\/bgz.de\/wp-content\/uploads\/2022\/11\/221027_BGZ_Forschungsprogramm_20_Abb19-1-768x594.png 768w, https:\/\/bgz.de\/wp-content\/uploads\/2022\/11\/221027_BGZ_Forschungsprogramm_20_Abb19-1-705x546.png 705w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/div><\/div><\/div><\/div>\n<div class='av-flex-placeholder'><\/div><div  class='flex_column av-5u5unpp-913879be779c89128293304e128aceb4 av_one_fourth  avia-builder-el-15  el_after_av_three_fourth  el_before_av_hr  flex_column_table_cell av-equal-height-column av-align-top  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-591m9d9-df76d51777ccb4b4b10e6e2ce83c338b\">\n#top .hr.av-591m9d9-df76d51777ccb4b4b10e6e2ce83c338b{\nmargin-top:30px;\nmargin-bottom:30px;\n}\n.hr.av-591m9d9-df76d51777ccb4b4b10e6e2ce83c338b .hr-inner{\nwidth:100px;\nborder-color:#0d57a0;\n}\n<\/style>\n<div  class='hr av-591m9d9-df76d51777ccb4b4b10e6e2ce83c338b hr-custom  avia-builder-el-16  el_before_av_textblock  avia-builder-el-first  hr-left hr-icon-no'><span class='hr-inner inner-border-av-border-fat'><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mhf0f0lg-5e798ef86787c76ca992168f17973ea4\">\n#top .av_textblock_section.av-mhf0f0lg-5e798ef86787c76ca992168f17973ea4 .avia_textblock{\ncolor:#0d57a0;\n}\n<\/style>\n<section  class='av_textblock_section av-mhf0f0lg-5e798ef86787c76ca992168f17973ea4 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p><em>Figure 4:<br \/>\nChange in characteristic values of metal seals due to ageing<\/em><\/p>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-50nvrzh-9a1c73b276added87afb38069928fb9e\">\n#top .hr.av-50nvrzh-9a1c73b276added87afb38069928fb9e{\nmargin-top:30px;\nmargin-bottom:30px;\n}\n.hr.av-50nvrzh-9a1c73b276added87afb38069928fb9e .hr-inner{\nwidth:100px;\nborder-color:#0d57a0;\n}\n<\/style>\n<div  class='hr av-50nvrzh-9a1c73b276added87afb38069928fb9e hr-custom  avia-builder-el-18  el_after_av_textblock  avia-builder-el-last  hr-left hr-icon-no'><span class='hr-inner inner-border-av-border-fat'><span class=\"hr-inner-style\"><\/span><\/span><\/div><\/p><\/div><\/div><!--close column table wrapper. Autoclose: 1 -->\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mhf0fjfo-ca828caef100162af1f74b0a9cae7bbc\">\n#top .hr.hr-invisible.av-mhf0fjfo-ca828caef100162af1f74b0a9cae7bbc{\nheight:30px;\n}\n<\/style>\n<div  class='hr av-mhf0fjfo-ca828caef100162af1f74b0a9cae7bbc hr-invisible  avia-builder-el-19  el_after_av_one_fourth  el_before_av_textblock '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<section  class='av_textblock_section av-mhf0g4n5-0240ca6ced06986dbcec26b456eb9dd7 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p>The long-term tests carried out so far and the operating experience of more than 25 years demonstrate that the high tightness requirements are also met in the long term by the metal seals used. This can be expected to remain the case for interim storage of 40 years and longer. However, in order to validate and quantitatively predict the sealing behaviour over longer periods of time, further investigations are required to determine the change in sealing characteristics under the influence of temperature and time.<\/p>\n<p>A study on the ageing behaviour of metal seals was carried out between 2013 and 2016 under the direction of GNS with RuDrift. The tests were carried out in the joint laboratory of Technetics and CEA at the Pierrelatte site (France). The stainless steel (SST) test flanges developed for the tests represent the standard sealing surface\/lid combination (nickel-plated cask body\/martensitic lid material). Aluminium- and silver-coated metal seals were used in the test flanges. These metal seals are of the kind used in the primary and secondary lids, the so-called main lids. The compressed metal seals used in the test flanges were stored for a total of two years at temperatures of 100\u00b0C and 130\u00b0C and for one year at 150\u00b0C to predict the sealing behaviour, particularly for the maximum design temperatures. Reference flanges were stored in parallel at room temperature. At different times, the test flanges were removed from the furnaces and the decompression curves were recorded with respect to Y<sub>1r<\/sub> and r<sub>ur<\/sub>. The results describe the quantitative behaviour of the metal seals for a temperature level that corresponds to the maximum design thermal load.<\/p>\n<p>In fact, the seal temperatures during interim storage are significantly lower than the test temperatures at RuDrift. This means that the design temperatures are not reached even at the time of loading and continue to drop due to the decreasing heat generation. Additional tests at lower temperature levels with a correspondingly extended test duration are also planned. These will be performed to obtain valid statements on the behaviour of metal seals at the sealing temperatures expected during extended interim storage. The study will also cover seals with a smaller torus diameter. These seals are used in the so-called small lids (closure lid, protective cap and pressure switch). There are also plans to study the transferability to the use of another sealing surface\/lid combination. This is a combination of uncoated cast iron (DCI) with stainless steel (SST), which is only relevant for main lids with aluminium-coated metal seals. The test programme (EP) under MSTOR is therefore as follows (see Figure 5):<\/p>\n<\/div><\/section>\n<div class='flex_column_table av-4h3yzgt-dc7bf90ea629346adf84272acfbae795 sc-av_four_fifth av-equal-height-column-flextable'><div  class='flex_column av-4h3yzgt-dc7bf90ea629346adf84272acfbae795 av_four_fifth  avia-builder-el-21  el_after_av_textblock  el_before_av_one_half  first flex_column_table_cell av-equal-height-column av-align-top  column-top-margin'     ><style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mhf0h7et-14bfc19d5ab81ba1047bc8330d15dd25\">\n.avia-image-container.av-mhf0h7et-14bfc19d5ab81ba1047bc8330d15dd25 img.avia_image{\nbox-shadow:none;\n}\n.avia-image-container.av-mhf0h7et-14bfc19d5ab81ba1047bc8330d15dd25 .av-image-caption-overlay-center{\ncolor:#ffffff;\n}\n<\/style>\n<div  class='avia-image-container av-mhf0h7et-14bfc19d5ab81ba1047bc8330d15dd25 av-styling- avia-align-center  avia-builder-el-22  avia-builder-el-no-sibling '   itemprop=\"image\" itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/ImageObject\" ><div class=\"avia-image-container-inner\"><div class=\"avia-image-overlay-wrap\"><img decoding=\"async\" fetchpriority=\"high\" class='wp-image-13434 avia-img-lazy-loading-not-13434 avia_image ' src=\"https:\/\/bgz.de\/wp-content\/uploads\/2022\/12\/221118_BGZ_Forschungsprogramm_21_Abb20.png\" alt='' title='221118_BGZ_Forschungsprogramm_21_Abb20'  height=\"599\" width=\"1200\"  itemprop=\"thumbnailUrl\" srcset=\"https:\/\/bgz.de\/wp-content\/uploads\/2022\/12\/221118_BGZ_Forschungsprogramm_21_Abb20.png 1200w, https:\/\/bgz.de\/wp-content\/uploads\/2022\/12\/221118_BGZ_Forschungsprogramm_21_Abb20-300x150.png 300w, https:\/\/bgz.de\/wp-content\/uploads\/2022\/12\/221118_BGZ_Forschungsprogramm_21_Abb20-1030x514.png 1030w, https:\/\/bgz.de\/wp-content\/uploads\/2022\/12\/221118_BGZ_Forschungsprogramm_21_Abb20-768x383.png 768w, https:\/\/bgz.de\/wp-content\/uploads\/2022\/12\/221118_BGZ_Forschungsprogramm_21_Abb20-705x352.png 705w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/div><\/div><\/div><\/div><\/div><!--close column table wrapper. Autoclose: 1 -->\n<div  class='flex_column av-3zj9mwd-0b38808ae3e319a4151a4dafb9b795be av_one_half  avia-builder-el-23  el_after_av_four_fifth  el_before_av_hr  first flex_column_div  '     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-3jeu58t-7e9c193c7d84a2ee42b0e09361fb1407\">\n#top .hr.av-3jeu58t-7e9c193c7d84a2ee42b0e09361fb1407{\nmargin-top:30px;\nmargin-bottom:30px;\n}\n.hr.av-3jeu58t-7e9c193c7d84a2ee42b0e09361fb1407 .hr-inner{\nwidth:100px;\nborder-color:#0d57a0;\n}\n<\/style>\n<div  class='hr av-3jeu58t-7e9c193c7d84a2ee42b0e09361fb1407 hr-custom  avia-builder-el-24  el_before_av_textblock  avia-builder-el-first  hr-left hr-icon-no'><span class='hr-inner inner-border-av-border-fat'><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mhf0hhqu-6a2994ac3c07494e970507b33942dc30\">\n#top .av_textblock_section.av-mhf0hhqu-6a2994ac3c07494e970507b33942dc30 .avia_textblock{\ncolor:#0d57a0;\n}\n<\/style>\n<section  class='av_textblock_section av-mhf0hhqu-6a2994ac3c07494e970507b33942dc30 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_inherit_color'  itemprop=\"text\" ><p><em>Figure 5:<br \/>\nOverview of the RuDrift\/MSTOR test programme<br \/>\n<\/em><\/p>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-31l0v4d-78e0aad024ff9759d704f13785b2d782\">\n#top .hr.av-31l0v4d-78e0aad024ff9759d704f13785b2d782{\nmargin-top:30px;\nmargin-bottom:30px;\n}\n.hr.av-31l0v4d-78e0aad024ff9759d704f13785b2d782 .hr-inner{\nwidth:100px;\nborder-color:#0d57a0;\n}\n<\/style>\n<div  class='hr av-31l0v4d-78e0aad024ff9759d704f13785b2d782 hr-custom  avia-builder-el-26  el_after_av_textblock  avia-builder-el-last  hr-left hr-icon-no'><span class='hr-inner inner-border-av-border-fat'><span class=\"hr-inner-style\"><\/span><\/span><\/div><\/p><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mhf0w334-62b6fe18f31497e1d9f28f5a46ddd219\">\n#top .hr.hr-invisible.av-mhf0w334-62b6fe18f31497e1d9f28f5a46ddd219{\nheight:20px;\n}\n<\/style>\n<div  class='hr av-mhf0w334-62b6fe18f31497e1d9f28f5a46ddd219 hr-invisible  avia-builder-el-27  el_after_av_one_half  el_before_av_one_fourth '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<div  class='flex_column av-2hc3v71-fdf1f5a65d167742a2a739f969904b20 av_one_fourth  avia-builder-el-28  el_after_av_hr  el_before_av_one_fourth  first flex_column_div  '     ><section  class='av_textblock_section av-mhf0j5in-85ee8e319336043dd3df4ebd9017fd23 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p><strong>EP1\/2<\/strong><br \/>\nContinuation of the artificial ageing of aluminium- and silver-coated metal seals in main lids at 130\u00b0C (plus one year) and 100\u00b0C (plus three years), which was started with RuDrift. The aim is to improve prediction accuracy in the selected temperature range and to carry out further reference testing of seals stored at room temperature (plus eight years).<\/p>\n<\/div><\/section><\/div>\n<div  class='flex_column av-27253vx-2a6be9c9cb3669afd6addfc2c717d7fb av_one_fourth  avia-builder-el-30  el_after_av_one_fourth  el_before_av_one_fourth  flex_column_div  '     ><section  class='av_textblock_section av-mhf0jn45-1863d8531fbef8b1b6a46cc3e0633890 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p><strong>EP3\/6<\/strong><br \/>\nExpansion of the database for aluminium- and silvercoated metal seals in main lids at ageing temperatures of 60\u00b0C and 80\u00b0C, in each case over a period of at least eight years.<\/p>\n<\/div><\/section><\/div>\n<div  class='flex_column av-1hqv1d9-72952e9512841cd81a87033a8af045d8 av_one_fourth  avia-builder-el-32  el_after_av_one_fourth  el_before_av_one_fourth  flex_column_div  '     ><section  class='av_textblock_section av-mhf0k7vl-849d9cf6b7b6b1f6d4ca5caf56e5625f '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p><strong>EP4<\/strong><br \/>\nCreation of a database for aluminium-coated metal seals in main lids for the flange combination DCI\/SST at representative ageing temperatures of 130\u00b0C (one year), 100\u00b0C (six years) and at room temperature (six years) for reference purposes.<\/p>\n<\/div><\/section><\/div>\n<div  class='flex_column av-11zcnjh-6e00f02d99c22d5848e25a5b1bca8bb1 av_one_fourth  avia-builder-el-34  el_after_av_one_fourth  el_before_av_hr  flex_column_div  '     ><section  class='av_textblock_section av-mhf0kdzo-02ec8171117d5133772ba8e993bdd02f '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><p><strong>EP5\/7<\/strong><br \/>\nCreation of a database for aluminium- and silver-coated metal seals in small lids for the flange combination SST\/ SST at ageing temperatures analogous to the large lid seals of 150\u00b0C (one year), 130\u00b0C (three years), 100\u00b0C (six years), 80\u00b0C (seven years) and 60\u00b0C (at least seven years) as well as at room temperature (at least seven years) for reference purposes.<\/p>\n<\/div><\/section><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mhf0lqr7-674b2e5dd0a9d106ce98f78df93bd91d\">\n#top .hr.hr-invisible.av-mhf0lqr7-674b2e5dd0a9d106ce98f78df93bd91d{\nheight:30px;\n}\n<\/style>\n<div  class='hr av-mhf0lqr7-674b2e5dd0a9d106ce98f78df93bd91d hr-invisible  avia-builder-el-36  el_after_av_one_fourth  el_before_av_textblock '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-mhf0lzcq-9ffd837888e05175752d0d9a382d5845\">\n#top .av_textblock_section.av-mhf0lzcq-9ffd837888e05175752d0d9a382d5845 .avia_textblock{\ncolumn-count:2;\ncolumn-gap:15 em;\n}\n\n@media only screen and (max-width: 479px){ \n#top .av_textblock_section.av-mhf0lzcq-9ffd837888e05175752d0d9a382d5845 .avia_textblock{\ncolumn-count:1;\n}\n.av_textblock_section.av-mhf0lzcq-9ffd837888e05175752d0d9a382d5845 .avia_textblock.av_multi_colums > p:first-child{\nmargin-top:0.85em;\n}\n}\n<\/style>\n<section  class='av_textblock_section av-mhf0lzcq-9ffd837888e05175752d0d9a382d5845 '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock av_multi_colums'  itemprop=\"text\" ><p>Models for predicting the change in the characteristic values of the metal seals are generated based on the temperature and time-dependent measurement results. These models allow the long-term behaviour of metal seals to be evaluated, taking into account real thermal loads and decay behaviour. The results can also be used to specifically pre-age metal seals by artificial ageing, for example for further studies on aged seals. To verify the calculations, additional flanges (so-called travelling flanges) with silver- and aluminium-coated metal seals are aged at various temperatures (130\u00b0, 100\u00b0, 80\u00b0 and 60\u00b0C) in the EP3\/6 test programmes. The respective measurement results are compared with the temperature- and time-dependent calculations. The aim is to demonstrate that the prediction model found is able to correctly calculate ageing under realistic operating conditions at decreasing temperatures.<\/p>\n<\/div><\/section>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-av_one_full-cd2f474e3bba50187b6ed141031f97f7\">\n#top .flex_column.av-av_one_full-cd2f474e3bba50187b6ed141031f97f7{\nmargin-top:0px;\nmargin-bottom:0px;\n}\n.responsive #top #wrap_all .flex_column.av-av_one_full-cd2f474e3bba50187b6ed141031f97f7{\nmargin-top:0px;\nmargin-bottom:0px;\n}\n<\/style>\n<div  class='flex_column av-av_one_full-cd2f474e3bba50187b6ed141031f97f7 av_one_full  avia-builder-el-38  el_after_av_textblock  el_before_av_hr  first flex_column_div  column-top-margin'     ><p>\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-av_hr-fb8f8e4fa21dcdb365b9430aeb7c21a4\">\n#top .hr.av-av_hr-fb8f8e4fa21dcdb365b9430aeb7c21a4{\nmargin-top:30px;\nmargin-bottom:30px;\n}\n.hr.av-av_hr-fb8f8e4fa21dcdb365b9430aeb7c21a4 .hr-inner{\nwidth:100px;\nborder-color:#0d57a0;\n}\n<\/style>\n<div  class='hr av-av_hr-fb8f8e4fa21dcdb365b9430aeb7c21a4 hr-custom  avia-builder-el-39  el_before_av_textblock  avia-builder-el-first  hr-left hr-icon-no'><span class='hr-inner inner-border-av-border-fat'><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<section  class='av_textblock_section av-mmbxlpdb-0b7210f39cfe44aa980a6c66c79044fb '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><h2 class=\"anleser\">Publications<\/h2>\n<\/div><\/section><br \/>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-av_hr-7a1a1df713b91246e12e7c5d2b3f0a33\">\n#top .hr.hr-invisible.av-av_hr-7a1a1df713b91246e12e7c5d2b3f0a33{\nheight:5px;\n}\n<\/style>\n<div  class='hr av-av_hr-7a1a1df713b91246e12e7c5d2b3f0a33 hr-invisible  avia-builder-el-41  el_after_av_textblock  el_before_av_textblock '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div><br \/>\n<section  class='av_textblock_section av-mmbxlwlw-4cb8c7aa6edda6344bb21f3c37a0752e '   itemscope=\"itemscope\" itemtype=\"https:\/\/schema.org\/CreativeWork\" ><div class='avia_textblock'  itemprop=\"text\" ><ul>\n<li><strong>Prediction Models For The Long-Term Performance Of Metal Seals In Dual-Purpose Casks<\/strong>, R. Schneider-Eickhoff, G. Jezdan, J. Becker; Proceedings of the 21st International Symposium on the Packaging and Transportation of Radioactive Materials, PATRAM25, 27 July &#8211; 1 August 2025, San Antonio, TX, USA, 2025.<br \/>\n<a href=\"https:\/\/www.researchgate.net\/publication\/395586100_Proceedings_of_the_21st_International_Symposium_on_the_Packaging_and_Transportation_of_Radioactive_Materials_1_PREDICTION_MODELS_FOR_THE_LONG-TERM_PERFORMANCE_OF_METAL_SEALS_IN_DUAL-PURPOSE_CASKS\">(PDF) Proceedings of the 21st International Symposium on the Packaging and Transportation of Radioactive Materials 1 PREDICTION MODELS FOR THE LONG-TERM PERFORMANCE OF METAL SEALS IN DUAL-PURPOSE CASKS<\/a><\/li>\n<li><strong><a href=\"https:\/\/doi.org\/10.69152\/BGZFachworkshop\/proceedings\/2025\">MSTOR\u2010Projekt: Prognosemodelle f\u00fcr das Alterungsverhalten von Metalldichtungen<\/a><\/strong>, Dr. Ghina Jezdan, Ralf Schneider-Eickhoff, Proceedings 4. Fachworkshop Zwischenlagerung, BGZ Gesellschaft f\u00fcr Zwischenlagerung, DOI 10.69152\/BGZFachworkshop\/proceedings\/2025, 2025.<\/li>\n<\/ul>\n<\/div><\/section><\/p><\/div><div  class='hr av-n0h7wt-b427d3dc174dc851d394752ee63a23e9 hr-default  avia-builder-el-43  el_after_av_one_full  el_before_av_buttonrow '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n<div  class='avia-buttonrow-wrap av-m8ofr2q8-b1300f8408a98bacf8600206ddf1663d avia-buttonrow-left  avia-builder-el-44  el_after_av_hr  el_before_av_hr '>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-1369wt9-74746dba5089f6588c185a0c2aeafc6a\">\n#top #wrap_all .avia-button.av-1369wt9-74746dba5089f6588c185a0c2aeafc6a{\nmargin-bottom:5px;\nmargin-right:5px;\n}\n<\/style>\n<a href='#top'  class='avia-button av-1369wt9-74746dba5089f6588c185a0c2aeafc6a avia-icon_select-no avia-size-small avia-color-theme-color'   aria-label=\"To top\"><span class='avia_iconbox_title' >To top<\/span><\/a>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-rdy9z1-629b3a287ca96bd66ba85ca3d1d03e3d\">\n#top #wrap_all .avia-button.av-rdy9z1-629b3a287ca96bd66ba85ca3d1d03e3d{\nmargin-bottom:5px;\nmargin-right:5px;\n}\n<\/style>\n<a href='https:\/\/bgz.de\/en\/research-programme\/#forschungsaktivitaeten'  class='avia-button av-rdy9z1-629b3a287ca96bd66ba85ca3d1d03e3d avia-icon_select-no avia-size-small avia-color-theme-color'   aria-label=\"All research activities\"><span class='avia_iconbox_title' >All research activities<\/span><\/a>\n<\/div>\n\n<style type=\"text\/css\" data-created_by=\"avia_inline_auto\" id=\"style-css-av-3pwu59-85770930f4ee5df96e266abaadeb45ae\">\n#top .hr.hr-invisible.av-3pwu59-85770930f4ee5df96e266abaadeb45ae{\nheight:50px;\n}\n<\/style>\n<div  class='hr av-3pwu59-85770930f4ee5df96e266abaadeb45ae hr-invisible  avia-builder-el-45  el_after_av_buttonrow  avia-builder-el-last '><span class='hr-inner '><span class=\"hr-inner-style\"><\/span><\/span><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"inline_featured_image":false,"footnotes":""},"class_list":["post-25741","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - 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