United States Nuclear Regulatory Commission - Protecting People and the Environment

RELAP5/MOD3.3 Assessment against PMK Test T3.1 – LBLOCA with Nitrogen in PRZ (NUREG/IA-0246)

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Publication Information

Manuscript Completed: November 2008
Date Published: October 2010

Prepared by:
Pavel Kral

Nuclear Research Institute Rez
Husinec-Rez 130
250 68 Rez, Czech Republic

A. Calvo, NRC Project Manager

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

Prepared for:
Division of Systems Analysis
Office of Nuclear Regulatory Research
U.S. Nuclear Regulatory Commission
Washington, DC 20555-0001

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Abstract

The results of RELAP5 post-test analyses of test T3.1 performed on the PMK experimental facility are presented. The Hungarian facility PMK is a scaled-down model of NPP with VVER-440/213 reactor. The code versions RELAP5/MOD3.3hg (post Patch03) and RELAP5/MOD3.3ef (Patch02) have been assessed against the experimental data from the test T3.1. The test T3.1 was a large-break LOCA with 30% break starting from shutdown conditions with nitrogen in PRZ. Generally, both prediction of system behavior and prediction of nitrogen transport are in very good agreement with measured data.

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