Reactor vessel cavity seal plate
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United States of America Patent
Stats
-
Jul 27, 1993
Grant Date -
N/A
app pub date -
Apr 30, 1992
filing date -
Apr 30, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A nuclear reactor vessel cavity seal plate. An annular support plate is positioned over the cavity between the reactor vessel and the shield structure. The inner diameter of the support plate rests freely upon the reactor vessel flange to allow movement of the vessel thereunder during thermal expansion and contraction. A flexible annular seal positioned over the support plate has its inner diameter seal welded to the reactor vessel flange and its outer diameter seal welded to the shield structure. Matching ports in the support plate and seal provide access to nuclear instruments below the support plate. A mounting block around each port accepts a cover plate that seals the port. This provides a permanent seal plate that allows flooding of the cavity for refueling with it only being necessary to remove the cove plates for normal reactor operations.
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