DEVELOPMENT OF LEVEL 2 PSA METHODOLOGY FOR SODIUM-COOLED FAST REACTORS: (2) DEVELOPMENT OF TECHNICAL BASIS IN THE INITIATING PHASE OF UNPROTECTED EVENTS
As part of level-2 PSA methodology development for sodium cooled fast reactors (SFR), event trees for the initiating phase (IP) of Anticipated Transient Without Scram (ATWS) are constructed. ULOF (Unprotected Loss of Flow), UTOP (Unprotected Transient Overpower) and ULOHS (Unprotected Loss of Heat Sink) are selected as typical and important accident categories. Based on the state-of-the-art knowledge, the headings of these event trees are selected so that dominant factors in accident consequences can be represented appropriately. For each of the headings, available information for judgment are reviewed and integrated as database for level-2 PSA. It is clarified that the headings of ULOF, for which experimental database and evaluation models have been reasonably established, can be commonly applied to certain part of the different accident categories. While, some points specific for UTOP and ULOHS are identified. ULOHS, in which significant heat up of the primary system is expected before start of the core disruption, necessitates an additional event tree before the core disruption providing various boundary conditions for the core disruption process.
ATWS level-2 PSA Initiating Phase event tree database
Ikken Sato Yoshiharu Tobita Hidemasa Yamano
Japan Atomic Energy Agency 4002 Narita-cho, O-arai, Ibaraki, 311-1393, Japan
国际会议
上海
英文
1185-1196
2010-10-10（万方平台首次上网日期，不代表论文的发表时间）