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Title: Staged depressurization system

A nuclear reactor having a reactor vessel disposed in a containment shell is depressurized in stages using depressurizer valves coupled in fluid communication with the coolant circuit. At least one sparger submerged in the in-containment refueling water storage tank which can be drained into the containment sump communicates between one or more of the valves and an inside of the containment shell. The depressurizer valves are opened in stages, preferably at progressively lower coolant levels and for opening progressively larger flowpaths to effect depressurization through a number of the valves in parallel. The valves can be associated with a pressurizer tank in the containment shell, coupled to a coolant outlet of the reactor. At least one depressurization valve stage openable at a lowest pressure is coupled directly between the coolant circuit and the containment shell. The reactor is disposed in the open sump in the containment shell, and a further valve couples the open sump to a conduit coupling the refueling water storage tank to the coolant circuit for adding water to the coolant circuit, whereby water in the containment shell can be added to the reactor from the open sump. 4 figures.
Inventors:
Issue Date:
OSTI Identifier:
5377419
Assignee:
Westinghouse Electric Corp., Pittsburgh, PA (United States) OAK; EDB-94-051711
Patent Number(s):
US 5259008; A
Application Number:
PPN: US 7-903413
Contract Number:
AC03-90SF18495
Resource Relation:
Patent File Date: 24 Jun 1992
Research Org:
Westinghouse Electric Corp
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; DEPRESSURIZATION SYSTEMS; DESIGN; REACTORS; AUXILIARY WATER SYSTEMS; CONTAINMENT SYSTEMS; DEPRESSURIZATION; PRESSURE VESSELS; PRIMARY COOLANT CIRCUITS; AUXILIARY SYSTEMS; CONTAINERS; CONTAINMENT; COOLING SYSTEMS; ENERGY SYSTEMS; ENGINEERED SAFETY SYSTEMS; REACTOR COMPONENTS; REACTOR COOLING SYSTEMS; 220200* - Nuclear Reactor Technology- Components & Accessories