S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Energy Systems Engineering (에너지시스템공학부) Nuclear Engineering (원자핵공학전공) Journal Papers (저널논문_원자핵공학과)
Analysis of the OECD main steam line break benchmark problem using the refined core thermal-hydraulic nodalization feature of the MARS/MASTER code
- Joo, Han Gyu; Jeong, Jae Jun; Cho, Byung Oh; Lee, Won Jae; Zee, Sung Quun
- Issue Date
- American Nuclear Society
- Nucl. Technol., 142, 166 (2003)
- Coupled spatial kinetics and thermal hydraulics; MARS/MASTER code; Steam Line Break; OECD MSLB benchmark
- The refined core thermal-hydraulics (T-H) nodalization feature of the MARS/MASTER code is used to generate a high-fidelity solution to the OECD main steam line break benchmark problem and to investigate the effects of core T-H nodalization. The MARS/MASTER coupling scheme is introduced first that enables efficient refined node core T-H calculations via the COBRA-III module. The base solution is generated using a fine T-H nodalization consisting of fuel assembly-sized radial nodes. Sensitivity studies are performed on core T-H nodalization to examine the impacts on core reactivity, power distribution, and transient behavior. The results indicate that the error in the peak local power can be very large (up to 25%) with a coarse T-H nodalization because of the inability to incorporate detailed thermal feedback. A demonstrative departure from nucleate boiling (DNB) calculation shows no occurrence of DNB in this problem.