The Ultimate Response Guideline Simulation and Study for Lungmen (ABWR) Nuclear Power Plant Using RELAP5/SNAP (NUREG/IA-0493)

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Publication Information

Manuscript Completed: October 2017
Date Published: February 2019

Prepared by:
Chunkuan Shih, Jong-Rong Wang, Wen-Shu Huang, Shao-Wen Chen, Ting-Yi Wang*, Tzu-Yao Yu*, Hsien-Lang Chiu*

Nuclear and New Energy Education and Research Foundation; Institute of Nuclear Engineering
and Science, National Tsing Hua University
101 Section 2, Kuang Fu Rd., HsinChu, Taiwan

*Department of Nuclear Safety, Taiwan Power Company
242, Section 3, Roosevelt Rd.,
Zhongzheng District, Taipei, Taiwan

K. 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


The RELAP5/SNAP model for Lungmen ABWR nuclear power plant (NPP) was established for the simulation and study of the URG (ultimate response guideline). The main actions of the URG are the depressurization and low pressure water injection of the reactor and the venting of the containment. Therefore, this research focuses to assess the URG utility of Lunemgn NPP under Fukushima-like conditions. Two steps are in this study. The first step is the establishment of RELAP5/SNAP model using the system and operating data, startup tests reports and FSAR of Lungmen NPP. The second step is the simulation and study of the URG under Fukushima-like conditions by using the above RELAP5/SNAP model. In this step, the case without URG was also performed to evaluate the URG effectiveness for Lungmen NPP. According to RELAP5 analysis results, the URG can keep the peak cladding temperature (PCT) below the failure criteria (1088.7 K) under Fukushima-like conditions. It indicates that Lungmen NPP can be controlled in a safe situation.

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