| 摘要 |
Seal for a large rotatable cover of a nuclear reactor containing protective gas and cooled with sodium wherein the cover is formed of a radially outer rotatable cover portion and a radially inner cover portion mutually connected by a plurality of peripherally distributed screws and the reactor has a flanged opening closable by the cover, comprising a removable outer ring surrounding the outer rotatable cover portion and threadedly secured to the flange of the reactor, a pair of spaced-apart inflatable hollow sealing rings surrounding the outer cover portion and received in the outer ring, a blocking gas connection located in the space between the sealing rings for supplying blocking gas to the space, a layer of tetrafluorethylene coated on the hollow sealing rings in situ in the outer ring, and an additional sealing member located below the inner cover portion, the screws connecting the inner and outer cover portions being adjustable for lowering the inner cover portion into sealing engagement with additional sealing member. |
