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Title: Nuclear reactor with makeup water assist from residual heat removal system

A pressurized water nuclear reactor uses its residual heat removal system to make up water in the reactor coolant circuit from an in-containment refueling water supply during staged depressurization leading up to passive emergency cooling by gravity feed from the refueling water storage tank, and flooding of the containment building. When depressurization commences due to inadvertence or a manageable leak, the residual heat removal system is activated manually and prevents flooding of the containment when such action is not necessary. Operation of the passive cooling system is not impaired. A high pressure makeup water storage tank is coupled to the reactor coolant circuit, holding makeup coolant at the operational pressure of the reactor. The staged depressurization system vents the coolant circuit to the containment, thus reducing the supply of makeup coolant. The level of makeup coolant can be sensed to trigger opening of successive depressurization conduits. The residual heat removal pumps move water from the refueling water storage tank into the coolant circuit as the coolant circuit is depressurized, preventing reaching the final depressurization stage unless the makeup coolant level continues to drop. The residual heat removal system can also be coupled in a loop with the refueling water supplymore » tank, for an auxiliary heat removal path. 2 figures.« less
Inventors:
;
Issue Date:
OSTI Identifier:
5387474
Assignee:
Westinghouse Electric Corp., Pittsburgh, PA (United States) OAK; EDB-94-044538
Patent Number(s):
US 5268943; A
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:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; PWR TYPE REACTORS; DESIGN; RHR SYSTEMS; AUXILIARY WATER SYSTEMS; DEPRESSURIZATION SYSTEMS; PRIMARY COOLANT CIRCUITS; AUXILIARY SYSTEMS; COOLING SYSTEMS; ENERGY SYSTEMS; ENRICHED URANIUM REACTORS; POWER REACTORS; REACTOR COMPONENTS; REACTOR COOLING SYSTEMS; REACTORS; THERMAL REACTORS; WATER COOLED REACTORS; WATER MODERATED REACTORS; 210200* - Power Reactors, Nonbreeding, Light-Water Moderated, Nonboiling Water Cooled