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Ohno, Shuji; Matsuki, Takuo*; ; Miyake, Osamu
JNC TN9520 2000-001, 196 Pages, 2000/01
JNC-TN9520-2000-001.pdf:5.13MB
ASSCOPS (Analysis of Simultaneous Sodium Combustion in Pool and Spray) has been developed for analyses of thermal consequences of sodium leak and fire accidents in LMFBRs. This report presents a description of the computational models, input and output data as the user's manual of ASSCOPS version 2.1. ASSCOPS is an integrated computational code based on the sodium pool fire code SOFIRE II developed by the Atomics International Division of Rockwell International, and on the sodium spray fire code SPRAY developed by the Hanford Engineering Development Laboratory in the U.S. The users of ASSCOPS need to specify the sodium leak conditions (leak flow rate and temperature, etc.), the cell geometries (cell volume, surface area and thickness of structures, etc.), and the atmospheric initial conditions such as gas temperature, pressure, and composition. ASSCOPS calculates the time histories of atmospheric temperature, pressure and of structural temperature.
Miyake, Osamu; Yamazaki, Hiroshi*; *; Himeno, Yoshiaki; Miyaguchi, Kimihide
PNC TN941 85-131, 53 Pages, 1985/08
For the analysis of sodium pool fire accidents in the LMFBR safety design, the computer codes SOFIRE-MII and ASSCOPS (the latter evaluate the pool-spray combined fires) have been utilized. In regard to the combustion phenomena of pool fire, better understanding has been obtained by experiments since the time of development of above mentioned codes. On the other hand, for the purpose of rationalization of the present LMFBR plants, the detailed analysis code is supposed to be required which can evaluate the sodium fires and their thermal effects more accurately and can remove existing conservatism of the present codes. Therefore, considering the requirement of the current status and trends, a new sodium pool fire model (SPM) has been accomplished mainly aiming at the evaluation of sodium fires under the air-filled secondary system condition. To model the actual phenomena precisely as possible, SPM takes account of the combustion flame above the pool surface, and the combustion heat and the heat transports to ambient and to the surrounding structures are estimated. To verify SPM, the comparisons of calculated results with experimental data obtained by the U.S. HEDL's CSTF and the German KfK's FAUNA facilities are presented. The comparisons with SOFIRE-II and SOFIRE-II are also discussed. Results show that the SPM predictions give reasonable agreement or somewhat overestimation, though, the pool temperature predictions are greatly improved in comparison with those of SOFIREs.