Heat-retarding closure system for pressure relief openings...

G - Physics – 21 – C

Patent

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359/38

G21C 9/00 (2006.01) G21C 9/004 (2006.01) G21C 9/008 (2006.01)

Patent

CA 1155566

Abstract of the Disclosure Heat retarding closure system for partitions having pressure relief openings formed therein especially in nuclear reactor buildings where main coolant nozzles of a reactor pressure vessel penetrate a biological shield, including lightweight construction closure elements having a side facing the reactor and anchors for holding the closure elements, the closure elements being pushable out of the anchors by an overpressure in a given pressure difference direction on the reactor side, and an outer sealing blowout skin, the closure elements being in the form of heat-retarding cassette inserts having a front surface with a peripheral shearing edge formed thereon resting against the blowout skin, and the blowout skin having a given thickness in the given pressure difference direction enabling the cassette insert to shear off the blowout skin and be pushed out of the anchors when a given pressure differ- ence is at least reached.

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