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Simulation of a hypothetical liquid relief valve failure (open) at Embalse nuclear power plant when a reactor shutdown is considered; Simulacion de la evolucion de la CNE (central nuclear Embalse) en el caso hipotetico de la apertura espuria de una valvula de alivio liquido con disparo del reactor

Abstract

The study of the spurious opening of the liquid relief valves is of great interest in CANDU nuclear power plants because this could lead to a loss of coolant through the degasser-condenser relief valves, and implies an undesirable intermittent opening/closure of them. In fact, there is a specific procedure to follow at Embalse nuclear power plant whenever this abnormal situation occurs. This procedure contains a section where a reactor trip is considered. Really, automatic reactor trip is not accepted to occur. No trip parameters set points are through to be reached (neutronic or process). However, the procedure considers the situation where the reactor does trip. We analyzed the plant behavior when a reactor shutdown is triggered. Our objective was to assess if after this trip, the procedure can lead the plant to a safe situation, preventing high pressures in the degasser-condenser and with the inventory recovered in the storage tank. The case was analyzed with Firebird III, Mod. 1.0 code. Two situations were considered: trip at 40 sec. and trip at 180 sec. after the liquid relief valve failed opened (the latter when the degasser-condenser fills up). Procedure analysis and code simulations showed that following the steps recommended, provided the  More>>
Authors:
Bedrossian, G; Gersberg, S [1] 
  1. Comision Nacional de Energia Atomica, San Martin (Argentina). Unidad de Actividad Reactores y Centrales Nucleares
Publication Date:
Dec 31, 1996
Product Type:
Conference
Report Number:
INIS-AR-121; CONF-961181-
Reference Number:
SCA: 210400; PA: AIX-29:000304; EDB-98:008423; SN: 98001898444
Resource Relation:
Conference: International conference on nuclear power competitiveness in the next two decades, Buenos Aires (Argentina), 18-21 Nov 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the international conference on nuclear power competitiveness in the next two decades; PB: 335 p.
Subject:
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS; COMPUTERIZED SIMULATION; EMBALSE REACTOR; F CODES; FAILURES; PRIMARY COOLANT CIRCUITS; RELIEF VALVES; SAFETY
OSTI ID:
555662
Country of Origin:
Argentina
Language:
Spanish
Other Identifying Numbers:
Other: ON: DE98603571; TRN: AR9700041000304
Availability:
OSTI as DE98603571
Submitting Site:
INIS
Size:
pp. 72-79
Announcement Date:
Feb 02, 1998

Citation Formats

Bedrossian, G, and Gersberg, S. Simulation of a hypothetical liquid relief valve failure (open) at Embalse nuclear power plant when a reactor shutdown is considered; Simulacion de la evolucion de la CNE (central nuclear Embalse) en el caso hipotetico de la apertura espuria de una valvula de alivio liquido con disparo del reactor. Argentina: N. p., 1996. Web.
Bedrossian, G, & Gersberg, S. Simulation of a hypothetical liquid relief valve failure (open) at Embalse nuclear power plant when a reactor shutdown is considered; Simulacion de la evolucion de la CNE (central nuclear Embalse) en el caso hipotetico de la apertura espuria de una valvula de alivio liquido con disparo del reactor. Argentina.
Bedrossian, G, and Gersberg, S. 1996. "Simulation of a hypothetical liquid relief valve failure (open) at Embalse nuclear power plant when a reactor shutdown is considered; Simulacion de la evolucion de la CNE (central nuclear Embalse) en el caso hipotetico de la apertura espuria de una valvula de alivio liquido con disparo del reactor." Argentina.
@misc{etde_555662,
title = {Simulation of a hypothetical liquid relief valve failure (open) at Embalse nuclear power plant when a reactor shutdown is considered; Simulacion de la evolucion de la CNE (central nuclear Embalse) en el caso hipotetico de la apertura espuria de una valvula de alivio liquido con disparo del reactor}
author = {Bedrossian, G, and Gersberg, S}
abstractNote = {The study of the spurious opening of the liquid relief valves is of great interest in CANDU nuclear power plants because this could lead to a loss of coolant through the degasser-condenser relief valves, and implies an undesirable intermittent opening/closure of them. In fact, there is a specific procedure to follow at Embalse nuclear power plant whenever this abnormal situation occurs. This procedure contains a section where a reactor trip is considered. Really, automatic reactor trip is not accepted to occur. No trip parameters set points are through to be reached (neutronic or process). However, the procedure considers the situation where the reactor does trip. We analyzed the plant behavior when a reactor shutdown is triggered. Our objective was to assess if after this trip, the procedure can lead the plant to a safe situation, preventing high pressures in the degasser-condenser and with the inventory recovered in the storage tank. The case was analyzed with Firebird III, Mod. 1.0 code. Two situations were considered: trip at 40 sec. and trip at 180 sec. after the liquid relief valve failed opened (the latter when the degasser-condenser fills up). Procedure analysis and code simulations showed that following the steps recommended, provided the liquid relief valve can be closed manually, the inventory that enters the degasser-condenser from the heat transport primary system through the failed valve could be recovered in the storage tank, leading the plant to shutdown in safe conditions, and preventing the degasser-condenser relief valves setpoint from being reached. (author). 3 refs., 10 figs.}
place = {Argentina}
year = {1996}
month = {Dec}
}