過酷事故対応のドライウェル冷却器の除熱特性
Heat Removal Characteristics of Dry-well Cooler for a Severe Accident
著者:
石田 直行 Naoyuki ISHIDA 綿引 直久 Naohisa WATAHIKI 細井 秀章 Hideaki HOSOI 渡邉 亮平 Ryohei WATANABE 佐藤 大樹 Daiki SATO
発刊日:
公開日:
CondensationDry-well coolerElement testHeat removalNatural circulationNon-condensable gasPrimary containment vesselSevere accident
概要
日立 GE 安藤 浩二 Kouji ANDOU Non-Member The new dry-well cooler (DWC) for a severe accident has been developed to avoid release of radioactive materials to environment caused by primary containment vessel failure. The DWC can be operated using natural driving force to remove decay heat. The element tests using copper tube bundle with 3 rows and 5 levels were conducted under existing nuclear power plant conditions to estimate heat removal ratio with non-condensable gas (N2) and to confirm occurrence of natural circulation through the DWC due to density difference. Test data showed that condensation continued in the DWC even under 30vol% N2 condition. Occurrence of natural circulation was confirmed from N2 fraction distribution estimated by temperature distribution in the DWC. As a result, it was confirmed that the DWC could remove heat under high N2 fraction condition and heat removal continued with consecutive steam flow into the DWC by natural circulation.
