CUPID 코드를 이용한 수직 증기 제트에 의한 헬륨 성층 침식 해석

국문 초록 (Abstract)

가압 경수로에서 사고 시에 격납 건물 내부로 방출된 수소는 폭발의 잠재성을 가지고 있기 때문에 격납 건물의 구조적 건전성에 위협이 될 수 있다. 따라서 수소의 폭발 위험을 줄이기 위한 수소 농도의 저감 방안이 필요하며, 원자로 냉각 계통 파단부에서 방출되는 증기 제트에 의한 수소 성층 침식은 대기 혼합을 통해 수소의 농도를 저감시킬 수 있는 중요한 현상 중의 하나이다. 본 연구에서는 3차원 CFD 코드인 CUPID를 이용한 격납 건물 수소 분포 예측과 관련하여, 제트에 의한 성층 침식 조건에 대해 해석에 적용되는 난류 모델과 복사 열전달 모델이 기체 농도 변화 및 온도 분포 예측에 미치는 영향을 평가하기 위한 민감도 계산을 수행하였고, 이를 바탕으로 유동 장애물이 고려되는 조건에서의 제트-성층 침식 현상에 대한 코드 검증 계산을 수행하였다. 코드 검증에는 HYMERES-2 프로젝트에서 수행된 수직으로 주입되는 증기 제트에 의한 헬륨 성층 침식 실험이 이용되었다.

다국어 초록 (Multilingual Abstract)

Hydrogen released into containment during an accident in a pressurized water reactor has the potential for explosion, which can be a threat to the structural integrity of containment. Therefore, it is necessary to mitigate the concentration of hydrogen to reduce the risk of explosion. Hydrogen stratification erosion by steam jet injected from a broken part of the reactor coolant system is one of the important phenomena that can mitigate the concentration of hydrogen through atmospheric mixing. The three-dimensional computational fluid dynamics analysis code CUPID was used in this study. A sensitivity analysis was conducted on the turbulence and radiative heat transfer models implemented in CUPID. For the validation of the analysis, the experimental data of HYMERES-2 were used. HYMERES-2 is a joint international project to investigate the helium stratification erosion phenomena by a vertical steam jet.

목차 (Table of Contents)

• 초록
• Abstract
• 1. 서론
• 2. 실험 장치 및 실험 조건
• 3. 해석 모델
• 4. 검증 계산 및 평가
• 5. 결론
• 참고문헌(References)

참고문헌 (Reference)

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