Method of exchanging a nozzle passing through a cover of a nuclear reactor pressure vessel
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United States of America Patent
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-
Apr 4, 1995
Grant Date -
N/A
app pub date -
Oct 25, 1993
filing date -
Oct 24, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
After some time incipient cracks may occur in nozzles welded directly into a reactor pressure vessel cover for guiding a control rod, which make it necessary to exchange the nozzles. A method is provided for exchanging the nozzles which changes the structure of the cover little during removal and accomplishes low-stress installation. According to the method, the nozzles are installed with prestressing. An annular surface is introduced from the inside of the cover coaxially to the through-bore and a supporting surface is introduced from the outside of the cover, which surfaces serve for applying the prestressing force and arresting the same.
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