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JAEA Reports

Improvement of FIRAC for the simulation of fire and extinguishment in the glove box

; Nagai, Takayuki*; ; Sasaki, Toshihisa*

JNC TN8400 99-007, 216 Pages, 1999/02

JNC-TN8400-99-007.pdf:9.37MB

If the fire accident was occurred in the Glove Box (GB) in the nuclear fuel cycle facilities, it is important to clear the fluctuation of the negative pressure in GB and the influence of the ventilation system. In Japan Nuclear Cycle Development Institute, the fire and extinguishment experiments about the GB ventilation system were executed. The simulations with a calculation code of these experiments were also performed. In this report, FIRAC were improved and these experiments were evaluated with FIRAC. FIRAC, which was developed in Los Alamos National Laboratory in U.S., is a computer code to simulate fire accidents in nuclear facilities. The original FIRAC can not simulate the GB ventilation system adequately. The original FIRAC can not simulate the inflow of the suffocative gas for the extinguishment experiments. The control damper model, the correction of storage of heat, the heat conduction of the construction materials, the model of the hot layer and cold layer, the model of inflow of the suffocative gas, etc., were improved, and the FIRAC are performed to simulate these experiments fitly.

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