Method and apparatus for testing, repairing or exchanging the nozzles passing through the bottom of a reactor pressure vessel
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United States of America Patent
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Jan 9, 1996
Grant Date -
N/A
app pub date -
Jan 19, 1994
filing date -
Jan 28, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and an apparatus for testing, repairing or exchanging nozzles of the bottom of a reactor pressure vessel include inserting individual shielding containers into the reactor pressure vessel. Shafts pass through a shielding container and water-filled cartridges can be inserted into the shafts. Tubes for receiving probes of an in-core instrumentation are embedded into bottom plates of the remaining shielding containers and into bottoms of the cartridges. After removing a cartridge, a carrier for working tools can be introduced into the shaft. In this way the radioactive loading is considerably reduced by the probes inside or outside the reactor pressure vessel.
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