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Prediction of sacrificial material ablation rate by corium jet impingement

노심 용융물 제트 충돌에 의한 희생물질의 침식예측

  • Suh, Jungsoo (Central Research Institute, Korea Hydro and Nuclear Power Co.) ;
  • Kim, Hangon (Central Research Institute, Korea Hydro and Nuclear Power Co.)
  • Received : 2014.03.12
  • Accepted : 2014.09.17
  • Published : 2014.09.30

Abstract

EU-APR1400, the Korean nuclear reactor design for European market adopts a so-called core catcher for ex-vessel molten corium retention and cooling as a severe-accident mitigation system. Sacrificial material, which controls melt properties and modifies melt conditions favorable for corium cooling and retention, is usually employed to protect core catcher body from molten corium. Since molten corium can be ejected through a breach of a reactor pressure vessel and impinged on the sacrificial material with enhanced heat transfer at a severe accident, it is very important to predict ablation rate of sacrificial material due to corium jet impingement accurately for core catcher design. In this paper, sacrificial-material ablation model based on boundary layer theory is suggested and compared with the experimental results by KAERI.

유럽 원전 시장 개척을 위해 개발 중인 EU-APR1400은 중대사고 대처설비로 노외 노심용융물 보유 및 냉각을 위한 소위 Core catcher라 불리는 노외 노심용융물 냉각설비를 개발 중이며, Core catcher body를 노심용융물로부터 보호하기 위하여 노심용융물의 물성 및 상태를 변화시켜 냉각 및 보유에 유리하게 하는 희생물질을 설치한다. 중대사고 시 원자로 압력용기의 틈으로부터 노심용융물이 분출되어 희생물질에 충돌 시 열 전달량이 매우 증가하게 되므로, 이 때 노심용융물 제트의 충돌에 의한 희생물질의 침식율을 정확하게 예측하는 것은 매우 중요하다. 이 논문에서는 경계층 이론을 기반으로 한 희생물질 침식 모형을 제안하고 KAERI에서 수행한 실험결과와 비교하였다.

Keywords

References

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