Snubber reduction analysis of secondary hot leg

摘要

The analysis is to verify the structural integrity of the Secondary Hot Leg Dump Heat Exchanger piping system of Fast Flux Test Facility (FFTF) under seismic loading after the deletion of seismic snubbers. ADLPIPE computer code was used to perform the analyses. Results of the piping stress analysis with snubber reduction are qualified in accordance with ASME Section II Class 1 requirements. The effects of inelastic strain accumulation, creep-fatigue damage and interaction, and elastic follow-up are evaluated. Anchor and hanger loads are evaluated by comparing with those from qualified seismic report.