United States Nuclear Regulatory Commission - Protecting People and the Environment

Analysis of Inadvertent Pressurizer Spray Valve Opening Real Transient with RELAP5/MOD3.2 (NUREG/IA-0194)

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Publication Information

Date Published: January 2001

Prepared by:
J. Blanco, L. Rebollo, E. Moralo, J. Pindado, P. Moreno

UNESA
C/ Francisco Gervas No. 3
28020 Madrid
SPAIN

Prepared as part of:
The Agreement on Research Participation and Technical Exchange
under the International Code Application and Maintenance Program (CAMP)

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

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Abstract

This document presents the comparison between the simulation results and the plant measurements of an actual event that took place in Jose Cabrera Nuclear Power Plant (NPP) in August 30, 1984. The event was originated by a continuous and inadvertent opening of the pressurizer spray valve.

Jose Cabrera NPP is a 510 Mwth single loop Westinghouse PWR owned by UNION ELECTRICA FENOSA, S.A. (UNION FENOSA), a Spanish utility that participates in the Code Application and Maintenance Project (CAMP) as a member of UNIDAD ELECTRICA, S.A. (UNESA).

The simulation has been carried out with the RELAP5/MOD3.2 code, running on a Digital AlphaServer 2000 4/200 computer under DIGITAL-UNIX operating system.

The main phenomena of the transient have been calculated correctly and some conclusions about the performance of new models and correlations incorporated in the MOD3.2 version, have been obtained. Several considerations about spray modelling in RELAP5/MOD3.2 are given. Additionally, a comparison with the MOD2.5 version results has shown some improvements and shortcomings of the new version.

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