서지주요정보
Transient multicomponent mixture analysis for air ingress phenomena in a high-temperature gas-cooled reactor (HTGR) = 고온가스로의 공기유입현상에 대한 다성분기체 거동 분석
서명 / 저자 Transient multicomponent mixture analysis for air ingress phenomena in a high-temperature gas-cooled reactor (HTGR) = 고온가스로의 공기유입현상에 대한 다성분기체 거동 분석 / Hong-Sik Lim.
저자명 Lim, Hong-Sik ; 임홍식
발행사항 [대전 : 한국과학기술원, 2005].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8016800

소장위치/청구기호

학술문화관(문화관) 보존서고

DNE 05003

휴대폰 전송

도서상태

이용가능

대출가능

반납예정일

초록정보

The air ingress accident is one of the postulated design basis accidents, a guillotine-type break of the main pipes connecting to the reactor vessel, which is still unclear if the present HTGRs can maintain a passive safe function for this type of break. In order to analyze the air ingress accident, we developed a multi-dimensional multi-component mixture analysis code (GAMMA) and investigated chemical reaction and thermo-fluid behaviors related to the accident. GAMMA includes the models to address the important physical phenomena: multi-component molecular diffusion, bulk and surface chemical reactions, and heat transport by conduction, convection and thermal radiation. Since the period of the transient is very long, about one month, the efficient analysis tool is necessary in order to get a solution numerically stable and computationally fast. Therefore, for fast code run, we adopt the Implicit Continuous Eulerian (ICE) technique which reduces a 10N ×10N matrix to an N×N pressure matrix. A concerned complex system can be configured by the linkage of a 1-D calculation module and a 2/3-D calculation module. In order to verify and validate the GAMMA code, we assessed various experiments and benchmark problems on the chemical reaction and heat removal behaviors: molecular diffusion tests, graphite oxidation tests, air-ingress tests, pebble-bed heat removal tests, and reactor cavity cooling system performance tests. The calculation results of the GAMMA code are in a high level of agreement with the experimental data as well as those of the other analysis codes used for the conventional HTGRs. From the air ingress analyses for the reference gas cooled reactors, PBMR and GT-MHR, significant rise in fuel temperature is observed for an assumed large air volume but the peak fuel temperature is predicted below the fuel failure criterion (1600℃). Sensitivity analysis on the air volumes in a vault and the onset timings of natural convection shows that the major parameters affecting on the severity of air ingress are the air concentration in a vault, the natural convection flow rate, and the bottom reflector temperature. In particular, if the air supply into the core is limited by isolating the reactor cavity immediately following the break, the consequence of air ingress would be mitigated enough to maintain the fuel and internal structure integrity during the accident.

서지기타정보

서지기타정보
청구기호 {DNE 05003
형태사항 xiii, 131 p. : 삽도 ; 26 cm
언어 영어
일반주기 Appendix : Elements of coefficient matrix and source vector
저자명의 한글표기 : 임홍식
지도교수의 영문표기 : Hee-Cheon No
지도교수의 한글표기 : 노희천
수록잡지명 : "GAMMA multi-dimensional multicomponent mixture analysis to predict air ingress phenomena in an HTGR". Nuclear science engineering,
수록잡지명 : "Transient multicomponent mixture analysis based on an ICE numerical technique for the simulation of an air ingress accident in an HTGR". Journal of the korean nuclear society, 36, 375-387(2004)
학위논문 학위논문(박사) - 한국과학기술원 : 원자력및양자공학과,
서지주기 Reference : p. 111-114
주제 Air Ingress
Gas-Cooled Reactor
Molecular Diffusion
Graphite Oxidation
GAMMA code
공기 유입
가스 냉각로
분자 확산
흑연 산화
GAMMA 코드
QR CODE qr code