SCDAP/RELAP5 Analysis of Station Blackout with Pump Seal LOCA in Surry Plant

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著者

    • HIDAKA Akihide
    • Sever Accident Research Laboratory, Department of Reactor Safety Research, Japan Atomic Energy Research Institute
    • SODA Kunihisa
    • Sever Accident Research Laboratory, Department of Reactor Safety Research, Japan Atomic Energy Research Institute
    • SUGIMOTO Jun
    • Sever Accident Research Laboratory, Department of Reactor Safety Research, Japan Atomic Energy Research Institute

抄録

During a station blackout of PWR, the pump seal will fail due to loss of the seal cooling.This particular transient-LOCA sequence designated as S3-TMLB' analyzed by SNL with MELPROG/TRAC for Surry plant showed that the depressurization due to the pump seal LOCA would result in early accumulator injection and subsequent core cooling which lead to the delay of reactor pressure vessel (RPV) meltthrough. The present analysis was performed with SCDAP/RELAP5 to evaluate this scenario shown in the MELPROG/TRAC analyses. Additionally, the calculated results were compared with the similar experimental studies of JAERI's ROSA-IV program.<BR>The present analyses showed that: (1) During S3-TMLB', the loop seal clearing would occur and cause a slight delay of accident progression. (2) It is unlikely that the accumulator injection, which leads to the delay of RPV meltthrough by approximately 60min, is initiated automatically during S3-TMLB'. Accordingly, an intentional depressurization using PORVs is recommended for the mitigation of the accident consequences. (3) The present SCDAP/RELAP5 analyses did not show significant delay of accident progression. It was found that non-realistic lower heat generation and higher core cooling models used in the MELPROG/TRAC analysis are attributed to this discrepancy.

収録刊行物

  • Journal of nuclear science and technology

    Journal of nuclear science and technology 32(6), 527-538, 1995-06-25

    Atomic Energy Society of Japan

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各種コード

  • NII論文ID(NAID)
    10002072698
  • NII書誌ID(NCID)
    AA00703720
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00223131
  • データ提供元
    CJP書誌  J-STAGE 
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