ATWS Analysis of Lungmen ABWR for MSIV Closure Transient (NUREG/IA-0438)

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Publication Information

Manuscript Completed: September 2013
Date Published: March 2014

Prepared by:
Jong-Rong Wang, Ai-Ling Ho*, Hao-Tzu Lin, Chunkuan Shih*

Institute of Nuclear Energy Research, Atomic Energy Council, R.O.C.
1000, Wenhua Rd., Chiaan Village, Lungtan, Taoyuan, 325, Taiwan

*Institute of Nuclear Engineering and Science, National Tsing Hua University
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:
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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Abstract

The objective of this report is to analyses the MSIV closure ATWS transient for Lungmen ABWR. There are three parts in ATWS analysis: ARI, FMCRD run-in and SLCS initiation.

The ATWS analyses show that the TRACE/PARCS coupling model established in this report indeed have ability to analyze the ARI and FMCRD initiation transient. And the design (RRCS) of Lungmen ABWR is verified to have an ability to mitigate the ATWS transient. In addition, it also shows the importance of control rod. Reactor power will decrease rapidly as control rod run-in. If the ARI and FMCRD run-in fail simultaneously, the peak reactor power would still be controlled by pressure, RVs, void fraction and RIP rotation speed. However, the reactor core shutdown will then rely on the SLCS injection after 300sec.

The peak pressure of ARI, FMCRD run-in, and SLCS initiation analyses is 9.12, 9.12, 9.40 MPaG respectively, which is below the 10.342 MPaG limit. And the peak cladding temperature is 309.5, 309.5, 591.78°C respectively, which is below the 1204°C limit. The oxidation under these temperatures is insignificant. Therefore, the primary system criteria and the fuel integrity critria of 10CFR50.46 are met.