RELAP5/MOD2 post-CHF heat and mass transfer models

Conference · Thu Mar 01 04:00:00 EST 1984

OSTI ID:7155975

Lin, J C; Tsia, C C; Ransom, V H; Johnsen, G W

RELAP5/MOD2 is a new version of RELAP5 containing improved modeling features that provide a generic pressurized water reactor transient simulation capability. In particular, the nonequilibrium modeling capability has been generalized to include post critical heat flux (CHF) conditions which occur in severe core damage accidents and large break loss-of-coolant accident. Objective of this paper is to describe the post-CHF wall heat transfer and interphase mass transfer model in RELAP5/MOD2 and to report the developmental assessment results using separate effects experiments. The post-CHF wall heat transfer and interphase mass transfer in RELAP5/MOD2 is mechanistically modeled. The developmental assessment results show that the post-CHF wall heat transfer and the interphase mass transfer are properly modeled. For further modeling improvements, new data with local void fraction or phasic velocity measurement are needed.

• Research Organization: EG and G Idaho, Inc., Idaho Falls (USA)
• DOE Contract Number: AC07-76ID01570
• OSTI ID: 7155975
• Report Number(s): EGG-M-06284; CONF-8404126-2; ON: DE84012538
• Country of Publication: United States
• Language: English

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