RELAP4 Modeling for Reverse Flow Property of BWR Jet Pump under Large Break LOCA Condition

Kiyoshi Matsumoto, Atsuo Kohsaka

Research output: Contribution to journalArticlepeer-review


It is very important to identify the reverse loss coefficient of BWR jet pump in the evaluation of core inlet flow at the beginning phase of BWR LBLOCA (Large Break Loss-of-Coolant Accident) analyses. Hence, the reverse flow property of jet pump was investigated in relation between the momentum equation, pressure loss coefficient and RELAP4 noding, and a new modeling has been proposed. In the proposed modeling, an equivalent pressure loss coefficient is used to take into account of the effect of accellerating pressure loss by the continuous flow area reduction from the tale pipe to the throat. The effectiveness of this model was studied by analyses for the LOFT 1/6 scale jet pump experiment and typical BWR LBLOCA. It has been, consequently, shown that this proposed model gives better jet pump property than a previous model which is used in the WREM sample problem and which gives very conservative result in core inlet flow and in the peak cladding temperature through whole transient.

Original languageEnglish
Pages (from-to)404-414
Number of pages11
JournalJournal of Nuclear Science and Technology
Issue number5
Publication statusPublished - 1986
Externally publishedYes


  • flowdown core inlet flow pressure loss momentum equation RELAP4 BWR type reactors
  • jet pump loss of coolant reverse flow computer codes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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