Method for removing debris from a nuclear reactor vessel

Induced nuclear reactions: processes – systems – and elements – Testing – sensing – measuring – or detecting a fission reactor... – Optics

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376313, 376310, G21C 1700, G21C 1942

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active

046108386

ABSTRACT:
A method for extracting debris from the bottom of a water-filled nuclear reactor vessel. The method includes steps of removing the vessel closure head, upper internals and at least some fuel assemblies from the reactor vessel to expose a flow hole which is contained in the lower core plate and which has a perimeter, wherein imaginary vertical projection lines extending from the perimeter define an obstructed volume between the lower core plate and the bottom of the vessel, lowering a pipe having an open free end into the vessel so that the pipe extends through the exposed flow hole in the lower core plate and has its free end in close proximity to the bottom of the vessel, applying suction to the end of the pipe remote from the open free end to withdraw water and debris from the bottom of the vessel through the pipe, and removing the debris from the water withdrawn from the vessel and discharging the debris-free water into a reservoir.

REFERENCES:
patent: 1305564 (1919-06-01), Purvis
patent: 3780571 (1973-12-01), Wiesener
patent: 3809608 (1974-05-01), Katz et al.
patent: 4309583 (1982-01-01), Krauss et al.
patent: 4376602 (1983-03-01), Landmark et al.

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