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Arrangements for closing penetrations in the walls op reactor pressure containing structures

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1. IN COMBINATION WITH A NUCLEAR REACTOR PRESSURE VESSEL HAVING A PENETRATION THROUGH THE PRESSURE VESSEL WALL TO PERMIT REMOVAL OF A PLANT COMPONENT WITHIN THE PRESSURE VESSLE, A NUCLEAR REACTOR PRESSURE VESSEL PENETRATION CLOSURE DEVICE COMPRISING: AN OUTER CLOSURE MEMBER, MOUNTING MEANS FOR REMOVABLY MOUNTING SAID OUTER CLOSURE MEMBER ONTO THE PRESSURE VESSLE TO CLOSE OFF THE SAID PENETRATION, AND A LEAK TIGHT SEAL OPERATIVELY ASSOCIATED WITH SAID OUTER CLOSURE MEMBER SO THAT THE SAID MOUNTING MEANS AND THE SAID LEAK TIGHT SEAL SEAL OFF PRESSURE DIFFERENCES WITHIN THE VESSEL AND A MASSIVE NON-SEALING INNER REMOVABLE CLOSING MEMBER, SECOND MOUNTING MEANS
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