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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Date Published: December 1993
F. Reventos, J. S. Baptista, A. P. Navas, P. Moreno
Asociacion Nuclear Asco
C/Tres Torres, 7
0817 - Barcelona
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
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.