SpizWurZ – Stress-induced hydrogen rearrangement in fuel rod cladding (2020 –2024)

Subject matter:	SpizWurZ – Stress-induced hydrogen rearrangement in fuel rod cladding (2020 –2024) » Expansion of the existing experimental basis for cladding performance under conditions of extended interim storage » Derivation of models for predicting cladding performance
Organisation:	» BMWi research funding for nuclear safety as part of the 7th Energy Research Programme (funding codes RS1586A, 1501609B) » GRS and KIT (IAM, INE) collaborative project (IAM, INE) » BGZ has observer status
Project period:	2020 to 2024

In the BMWi/BMUKN-funded joint project of GRS and KIT (funding codes RS1568A [GRS] and 1501609B [KIT]), experimental and model-based investigations were carried out into how hydrogen is distributed in zirconium-based cladding tubes under long-term stress conditions.

The work expanded the data basis for hydrogen diffusion at micro and macro level and provided data on the hydride structure of non-irradiated cladding tubes. BGZ was involved as an observer and was able to incorporate the findings into its own research projects with irradiated fuel rods.

Publications (german language)

Abschlussbericht: Spannungsinduzierte Wasserstoffumlagerung in Brennstabhüllrohren während längerfristiger Zwischenlagerung (SPIZWURZ), Aleksandra Rezchikova et al., GRS-808, ISBN 978-3-911727-01-3, 2025.

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