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Heat-retarding closure system for pressure relief openings of partitions, in nuclear reactor buildings

  • US 4,495,147 A
  • Filed: 01/22/1981
  • Issued: 01/22/1985
  • Est. Priority Date: 01/23/1980
  • Status: Expired due to Fees
First Claim
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1. Heat retarding closure system, for partitions having pressure relief openings formed therein, in nuclear reactor buildings where main coolant nozzles of a reactor pressure vessel penetrate a biological shield, comprising blowout inserts in the form of closure elements having a side facing the reactor, a side facing away from the reactor and anchors for holding said closure elements, said blowout inserts being pushable out of said anchors by an overpressure in a given pressure difference direction on said side facing the reactor, and an outer sealing blowout skin, said blowout inserts being in the form of heat-retarding cassette inserts having a front surface at said side facing away from the reactor with a peripheral shearing edge formed thereon resting against said blowout skin, said blowout skin having a given thickness in said given pressure difference direction, said blowout skin being sheared off by said shearing edge of said cassette insert and said cassette insert being pushed out of said anchors when a given pressure difference is reached, said anchors being in the form of a partition seat having an outside and an inside and said partition seat and blowout insert being widened from the inside to the outside.

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