CAJ | 학술논문

严重事故情况下压力容器下封头内熔融物的传热对保持压力容器的完整性有着重要的作用。该过程作用机理非常复杂，包括多孔碎片导热、压力容器壁导热以及熔池的自然对流传热等。本文基于有限元方法，开发二维有限元瞬态传热程序 FEM OC ，利用固体导热的方法计算下封头熔融物的两相传热。熔融物相变的处理采用固相增量法，在导热方程中引入凝固率来衡量计算单元的凝固程度；处于两相区的有限元内用有效热导率模拟真实的两相传热过程。本文计算结果与SCDAP/RELAP5的进行对比，结果显示程序的模型精度符合要求。
엄중사고정황하압력용기하봉두내용융물적전열대보지압력용기적완정성유착중요적작용。해과정작용궤리비상복잡，포괄다공쇄편도열、압력용기벽도열이급용지적자연대류전열등。본문기우유한원방법，개발이유유한원순태전열정서 FEM OC ，이용고체도열적방법계산하봉두용융물적량상전열。용융물상변적처리채용고상증량법，재도열방정중인입응고솔래형량계산단원적응고정도；처우량상구적유한원내용유효열도솔모의진실적량상전열과정。본문계산결과여SCDAP/RELAP5적진행대비，결과현시정서적모형정도부합요구。
In severe accident situations , the heat transfer of lower head plays an important role in the integrity of the reactor pressure vessel (RPV ) .This process is very complex ,comprising porous debris conduction ,heat conduction of RPV wall and the pressure vessel wall and the natural convection of corium .In this paper ,a code named FEMOC was made using the finite element method to solve the two-dimensional transient two-phase heat transfer of the lower head .The phase changing process was treated using solid phase increment method ,and solidification rate was added into heat conduction equation to measure the solidification of corium .When the material in the element was in two-phase condition , effective heat transfer efficient was used to simulate the real conduction process .Results were compared with results of the SCDAP/RELAP5 calculations .It shows that the model accuracy meets the requirements .