Analysis of Maanshan Station Blackout Accident and Rescue Procedures under Different Tube Plugging Situations with TRACE (NUREG/IA-0517)

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Publication Information

Manuscript Completed: November 2019
Date Published: January 2020

Prepared by:
Jung-Hua Yang, Tsung-I Shen, Shao-Wen Chen, Jong-Rong Wang, Chunkuan Shih
National Tsing Hua University and Nuclear and New Energy Education and Research Foundation
101 Section 2, Kuang Fu Rd.,
HsinChu, 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

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This research focused on the analysis of URG (Ultimate Response Guideline) procedure and the FLEX (Flexible and Diverse Coping Strategies) strategy after one and four hours when Maanshan nuclear power plant is under station blackout (SBO) accident by using TRACE code. This research then explores the influence on heat transfer between primary side and secondary side when there is a plugged tube in the steam generators of the power plant. The NEI (Nuclear Energy Institute) had proposed a FLEX strategy [1-3] and Taiwan Power Company also has developed URG procedure [4, 5], in order to maintain the safety of plant during a severe disaster. The equipment of plant will become old and deteriorative as time passes by. If there are any problems with the tubes of steam generators, operators will plug the defective tube during outage inspection to prevent them from leaking or bursting. This research uses TRACE to analyze under 2%, 5% and 10% of tube plugging, the effectiveness of the URG procedure and the FLEX strategy used during the SBO accident of Maanshan nuclear power plant. The result shows that even under 10% of tube plugging, the URG procedure and the FLEX strategy won’t be affected by tube plugging and still can bring the plant back to safety.

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