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[en] This paper documents a new approach which simulates without interruption the blowdown and the post-blowdown portions of a LOCA/LOECC. The blowdown portion is simulated first with the pressures, enthalpies, and void fractions of the headers as boundary conditions. The transient inlet header flowrates are written to a file. The blowdown portion is then simulated again with the inlet header flowrates as boundary conditions. At the end of the blowdown, the flowrates are gradually changed to obtain the desired constant gas flowrate of the post-blowdown portion. This new approach was applied with CATHENA MOD3.5a Rev. 0 for a 20% reactor inlet header break coincident with a total loss of emergency core cooling injection. In summary, this paper shows a successful new approach where the blowdown and the post-blowdown portions of a large LOCA coincident with a total loss of emergency core cooling are simulated continuously. (author)
Source
Donnelly, J.V. (Atomic Energy of Canada Limited, Mississauga, Ontario (Canada)); Oliva, A. (Ontario Hydro, Toronto, Ontario (Canada)) (eds.); Canadian Nuclear Society, Toronto, Ontario (Canada); [1122 p.]; ISSN 0227-1907; 
; 1997; v. 2 [13 p.]; Powering Canada's future; Toronto, Ontario (Canada); 8-11 Jun 1997; 5 refs., 1 tab., 11 figs.
; 1997; v. 2 [13 p.]; Powering Canada's future; Toronto, Ontario (Canada); 8-11 Jun 1997; 5 refs., 1 tab., 11 figs.