Development of a system code for transient analysis in a HTGR = 초고온가스냉각로의 천이해석을 위한 계통코드 개발

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A GAMMA (GAs Multi-component Multi-dimensional Analysis) code is developed for transient analysis and air ingress analysis in High Temperature Gas-cooled Reactors (HTGR). The PBMR of ESKOM is selected as a reference plant for the High Temperature Gas-cooled Reactor here, which uses a direct helium cycle and pebble fuel. Physical models included in GAMMA are the pebble conduction model, radiation heat transfer model, point kinetics model, decay heat model, and component models for break flow, valve, pump, cooler, power conversion unit model. The temperature distribution and the flow distribution of the PBMR are calculated for initial and accident core in the present study. In the accident analysis, typical design basis accident (DBA), including the load transient accident and depressurization accident into the system are selected and analyzed in detail. The predictions by GAMMA for PBMR at 100% power are compared with those by VSOP and PBR_SIM. It turns out that the temperature in the upper region in the third channel predicted by GAMMA is about 62℃ at maximum higher than that by VSOP, but is pretty close to that by PBR_SIM. The center temperature of the fuel shows that that predicted by considering swelling effect is higher than that without swelling effect by about 10 ℃. The net efficiency of direct system is higher than that of indirect system due to an effect of the circulator power. The transient capability of GAMMA is validated through analytical solution and PBR_SIM analyzing the depressurization (Loss Of Coolant Accident, LOCA) and load transient accident. After the LOCA the system pressure decreases dramatically from 8MPa to 0.4MPa within 2 sec. After the PI (Proportional-plus-Integral) controller senses that the power shaft is over the set-point of 3,600 rpm, the bypass valve makes shaft speed back to the set-point.
No, Hee-Cheonresearcher노희천researcher
한국과학기술원 : 원자력및양자공학과,
Issue Date
238253/325007  / 020023501

학위논문(석사) - 한국과학기술원 : 원자력및양자공학과, 2004.2, [ viii, 63 p. ]


system code; ICE(Implicit Continuous Eulerian) scheme; GAMMA(GAs Multi-component Muti-dimensional Analysis) code; PBMR(Pebble Bed Modular Reactor); transient analysis; 헬륨 냉각가스; 감압사고; 계통코드; 천이해석; 초고온 가스냉각로

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