Investigation of the Loop Seal Clearing Phenomena for the ATLAS DVI Line and Cold Leg SBLOCA Tests Using MARS-KS and RELAP5/MOD3.3 (NUREG/IA-0501)

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Publication Information

Manuscript Completed: March 2018
Date Published: March 2019

Prepared by:
Minjeong Hwang, Suk K. Sim, Ki-Yong Choi*, Kyung Won Lee**

Environment & Energy Technology, Inc.
213 R&D Building, 99, Gajeong-ro, Yuseong-gu, Daejeon, Republic of Korea

*Department of Nuclear Thermal Hydraulics and Safety
Korea Atomic Energy Research Institute, Daejeon, Republic of Korea

**Korea Institute of Nuclear Safety
62 Gwahak-ro, Yuseong-gu, Daejeon 34142, Republic of Korea

Kirk Tien, NRC Project Manager

Division of Systems Analysis
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

Prepared as part of:
The Agreement on Research Participation and Technical Exchange
Under the Thermal-Hydraulic Code Applications and Maintenance Program (CAMP)

Published by:
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001


Availability Notice

In the framework of the ATLAS Domestic Standard Problem (DSP), the loop seal clearing phenomena of the ATLAS Direct Vessel Injection (DVI) line and cold leg Small Break Loss of Coolant Accident (SBLOCA) tests were investigated. MARS-KS and RELAP5/MOD3.3 codes were used to predict the transient thermal hydraulic behavior of the DVI line and cold leg SBLOCA and compared with the ATLAS test data. MARS-KS and RELAP5/MOD3.3 calculations show that both codes predict the sequence of events and major thermal hydraulic behaviors of the tests with reasonable agreement. However, both codes calculate some discrepancies in predicting core collapsed water level, loop seal clearing and thus show large differences in the maximum PCT. Further R&D is required specifically to investigate the loop seal clearing phenomena and its effects on the safety during a postulated SBLOCA.

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