Abstract

The “Establishing AMR Structural Integrity Codes and Standards for UK GDA” (EASICS) project has recently been established to help support the acceptance of Advanced Modular Reactors, or AMRs, which are typically based on high temperature Generation IV reactors. The EASICS project is looking to help define the requirements for codes and standards for the design of AMRs, to ensure that state-of-the art knowledge will be brought to bear on developing the required design and assessment methodologies. The EASICS project is to run from July 2019 to March 2021.

To support this, the work presented in this paper provides an overview of two interacting aspects of this programme. The first is to perform validation tests for high temperature creep-fatigue assessments of a plant relevant component. The second aspect is to use these results, along with those of other identified tests, to provide a comparison of internationally recognised approaches for the assessment of high temperature (creep regime) components. This paper provides an initial overview of the works and progress; the final results will be presented in subsequent paper(s).

Specialist testing of a plant relevant component (thin tubes butt welded together) under high temperature loading conditions will be performed. The validation testing is to include two fatigue tests and four creep-fatigue tests on 316H welded tubes. The tubes will be subject to strain controlled tension/compression (R-ratio of −1), with the possibility to apply a displacement controlled dwell. The tests will be conducted at 525 C.

To help enhance interaction with the code bodies, and to understand the impact of differences in the approaches, comparative assessments will be performed when adopting R5, ASME Section III Div 5 and RCC-MRx. One comparison will be based around the tests detailed here. The second assessment comparison will consider the Evasion mock-up tests provided by CEA (sodium based thermal shock tests). The third assessment case currently still needs to be defined in the programme at the time of writing. The subsequent discussions over results, differences and potential impact to the codes will help inform a guidance document to best assess AMRs in the UK.

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