United States Nuclear Regulatory Commission - Protecting People and the Environment

Application of TRACE V5.0 P2 to China Domestic PWR LBLOCA Analysis (NUREG/IA-0427)

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Publication Information

Manuscript Completed: March 2013
Date Published: July 2013

Prepared by:
FENG Jinjun, CHAI Guohan, ZHOU Kefeng, SHI Junying

Nuclear and Radiation Safety Centre
Ministry of Environmental Protection
54 Honglian Nancun
Haiden District, Beijing, 100082, China

A. Calvo, NRC Project Manager

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 purpose of this work is to study the behavior of China domestic PWR under LBLOCA scenario using the TRACE (TRAC/RELAP Advanced Computational Engine) code. The work is divided into five parts:

The first part is TRACE model establishment. SNAP(Symbolic Nuclear Analysis Program) program was used to facilitate system modeling work. Important components such as active core, pressurizer, accumulator and steam generator were modeled respectively. These components were tested separately and results were compared with design data to check the accuracy. Key parameters were indentified and properly adjusted to refine the model further. All of the components were incorporated together to build up the integrated TRACE model of China domestic PWR.

The second part is steady state calculation. Steady state of full power operation was simulated by TRACE code and calculation results were compared with design data. Hydraulic frictions were adjusted to keep calculated and designed flow distribution as close as possible. The adjustment work was iterated until all of key parameters were acceptable.

The third part is transient calculation. The LBLOCA scenario was simulated in this part. Restart case of accident scenario was prepared based on the steady state TRACE model established previously. The transient calculation results showed that safety goal was achieved under the assumed accident scenario.

The forth part is sensitivity analysis. Sensitivity analysis of break spectrum and initial accumulator pressure was performed respectively. The most limiting break size and proper initial accumulator pressure were found though the sensitivity analysis.

The last part is accident scenario animation. SNAP was used to create the animation of the LBLOCA Accident scenario. Better understanding of the calculated physical phenomena and transient process was obtained via animation demonstration.

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