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Title: Passive containment cooling system with drywell pressure regulation for boiling water reactor

A boiling water reactor having a regulating valve for placing the wetwell in flow communication with an intake duct of the passive containment cooling system. This subsystem can be adjusted to maintain the drywell pressure at (or slightly below or above) wetwell pressure after the initial reactor blowdown transient is over. This addition to the PCCS design has the benefit of eliminating or minimizing steam leakage from the drywell to the wetwell in the longer-term post-LOCA time period and also minimizes the temperature difference between drywell and wetwell. This in turn reduces the rate of long-term pressure buildup of the containment, thereby extending the time to reach the design pressure limit.
  1. (Tucson, AZ)
Issue Date:
OSTI Identifier:
General Electric Company (San Jose, CA) OAK
Patent Number(s):
US 5377243
Contract Number:
Research Org:
General Electric Co
Country of Publication:
United States
passive; containment; cooling; drywell; pressure; regulation; boiling; water; reactor; regulating; valve; placing; wetwell; flow; communication; intake; duct; subsystem; adjusted; maintain; slightly; below; initial; blowdown; transient; addition; pccs; design; benefit; eliminating; minimizing; steam; leakage; longer-term; post-loca; time; period; minimizes; temperature; difference; reduces; rate; long-term; buildup; extending; reach; limit; temperature difference; water reactor; time period; flow communication; containment cooling; passive containment; boiling water; regulating valve; pressure buildup; /376/