United States Nuclear Regulatory Commission - Protecting People and the Environment

Assessment of a Pressurizer Spray Valve Faulty Opening Transient at Asco Nuclear Power Plant with RELAP5/MOD2 (NUREG/IA-0121, ICSP–AS–SPR–R)

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Publication Information

Date Published: December 1993

Prepared by:
F. Reventos, J. S. Baptista, A. P. Navas, P. Moreno

Asociacion Nuclear Asco
C/Tres Torres, 7
0817 - Barcelona
Spain

Prepared as part of:
The Agreement on Research Participation and Technical Exchange
under the International Thermal-Hydraulic Code Assessment
and Application Program (ICAP)

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

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Abstract

The Asociación Nuclear Ascó has prepared a mocdel of Ascó NPP using RELAP5/MOD2. This model, which include thermalhydraulics, kinetics and protection and controls, has been qualified in previous calculations of several actual plant transients.

One of the transients of the qualification process is a "Pressurizer spray valve faulty opening" presented in this report. It consists in a primary coolant depressurization that causes the reactor trip by overtemperature and later on the actuation of the safety injection

The results are in close agreement with plant data.

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