原子炉再循環ポンプ熱疲労割れ対策

  • 野田 宏
    北海道大学大学院 工学研究科エネルギー環境システム
  • 奈良林 直
    北海道大学大学院 工学研究科エネルギー環境システム
  • 高橋 祐治
    (財)電気事業連合会 原子力部

書誌事項

タイトル別名
  • Countermeasure against Thermal Fatigue Crack of Primary Loop Recirculation Pump in BWR
  • ゲンシロ サイジュンカン ポンプ ネツ ヒロウ ワレ タイサク

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抄録

  The reactor water was fed to the purge water of the mechanical seal on the original design of the primary loop recirculation pump. Because the mechanical seal had a short life due to the cruds in the reactor water, the clean purge water was adopted instead of the reactor water. After this modification, the shallow cracks were found on the surface of the pump shaft and casing cover due to the temperature fluctuation between the cold purge water and the hot pump discharge water. The fundamental mechanism and countermeasure were investigated by scale test, mock-up test and so on. The flow barrier with a heater was contrived through these tests. It has been introduced gradually in operating and constructing PLR pumps after its completion in 1995. The PLR pumps are overhauled around every 10 years in Japan. The first overhaul of the PLR pumps showed no cracks around the pump shaft and casing cover after 10 years' operation. This paper presents both its development process and inspection results.<br>

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