POSTED 19.10.21

EASL - Seismic analysis of an AGR gas baffle

In a periodic safety review of an advanced gas reactor (AGR) gas baffle safety case, a requirement was identified for establishing structural integrity in the gas baffle and circulator outlet gas duct (COGD) under a reference earthquake with a zero period acceleration of 0.14g corresponding to an annual probability of exceedance of 10-4. EASL undertook fracture mechanics and ASME III design code assessments at critical locations under combined pressure, temperature and seismic loading. The stresses and strains obtained from this study were subsequently used to demonstrate that the AGR gas baffle design was fit-for-purpose when subject to the reference earthquake.