Development of Severe Accident Analysis Code SAMPSON in IMPACT Project

• Published in: Journal of nuclear science and technology 1999-11, Vol.36 (11), p.1076
• Main Authors: UJITA, Hiroshi, SATOH, Nobuhide, NAITOH, Masanori, HIDAKA, Masataka, SHIRAKAWA, Noriyuki, YAMAGISHI, Makoto
• Format: Article
• Language: English
• ISSN: 0022-3131; 1881-1248
• DOI: 10.3327/jnst.36.1076

IMPACT is the name of a program and of specific simulation software, which will perform full-scope and detailed calcutations of various phenomena in a nuclear power plant for a wide range of event scenarios. The four years of the IMPACT project Phase I have been completed, and each analysis module of the prototype version of the severe accident analysis code SAMPSON has been developed and verified by comparison with separate-effect test data. Verification of the integrated code with combinations of up to 11 analysis modules has been conducted, with the Analysis Control Module, to demonstrate the code capability and integrity. A 10-inch cold leg failure Loss of Coolant Accident in the Surry Plant was the assumed initiating event. The system analysis was divided into two cases; one was an in-vessel retention analysis when gap cooling was effective, the other was an analysis of phenomena when the event was extended to ex-vessel due to the reactor pressure vessel failure when gap cooling was not sufficient. Using the Analysis Control Module to select and execute adequate combinations of the various analysis modules dynamically according to the progression of plant phenomena and to control parallel processing, the goal of integrated calculations by SAMPSON with multiple analysis modules executing in parallel was achieved.