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

Abstract

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.« less

Inventors:
 [1];  [2]
  1. (New Kensington, PA)
  2. (Murrysville, PA)
Issue Date:
Research Org.:
Westinghouse Electric Corp
OSTI Identifier:
869059
Patent Number(s):
5268943
Assignee:
Westinghouse Electric Corp. (Pittsburgh, PA) OAK
DOE Contract Number:  
AC03-90SF18495
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
nuclear; reactor; makeup; water; assist; residual; heat; removal; pressurized; coolant; circuit; in-containment; refueling; supply; staged; depressurization; leading; passive; emergency; cooling; gravity; feed; storage; tank; flooding; containment; building; commences; due; inadvertence; manageable; leak; activated; manually; prevents; action; operation; impaired; pressure; coupled; holding; operational; vents; reducing; level; sensed; trigger; successive; conduits; pumps; move; depressurized; preventing; reaching; final; stage; unless; continues; drop; loop; auxiliary; path; coolant level; pressurized water; water storage; storage tank; reactor coolant; passive cooling; nuclear reactor; residual heat; heat removal; water supply; containment building; auxiliary heat; refueling water; water nuclear; coolant circuit; staged depressurization; makeup water; gravity feed; supply tank; in-containment refueling; move water; /376/

Citation Formats

Corletti, Michael M., and Schulz, Terry L. Nuclear reactor with makeup water assist from residual heat removal system. United States: N. p., 1993. Web.
Corletti, Michael M., & Schulz, Terry L. Nuclear reactor with makeup water assist from residual heat removal system. United States.
Corletti, Michael M., and Schulz, Terry L. Fri . "Nuclear reactor with makeup water assist from residual heat removal system". United States. https://www.osti.gov/servlets/purl/869059.
@article{osti_869059,
title = {Nuclear reactor with makeup water assist from residual heat removal system},
author = {Corletti, Michael M. and Schulz, Terry L.},
abstractNote = {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 supply tank, for an auxiliary heat removal path.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1993},
month = {1}
}

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