Method and device for removing a specimen from within the vessel

Details Method and device for removing a specimen from within the vessel Method and device for removing a specimen from within the vessel

1992-10-21

1993-12-07

Evans, Geoffrey S.

Electric heating

Metal heating

Cutting or disintegrating

219 692, 376260, B23H 900

Patent

active

052685500

ABSTRACT:
A method and device for removal of a specimen (30), especially a parallelepipedal specimen, from within the internal wall of the vessel of a nuclear reactor which is at the end of its service and whose core has previously been dismantled, but which retains a high residual radioactivity. A rotating platform (10) carrying tools (23, 24) for cutting out by electrical discharge is inserted into the vessel (1), maintained under protective water (7). A first electrode produces a recess in a direction perpendicular to the internal wall (21) of the vessel, delimiting the external contour of the specimen, and a second electrode cuts the rear of the latter to a specified depth, before the withdrawal thereof from the wall. The specimen thus obtained is then extracted from the vessel.

REFERENCES:
patent: 3910138 (1975-10-01), Sinha et al.
patent: 4405430 (1983-09-01), Hanulik
patent: 5209895 (1993-05-01), Wivagg
patent: 5225645 (1993-07-01), Overbay et al.
"Performance of the Automated Cutting Equipment System During the Plasma Cutting of the Three Mile Island Unit 2 Lower Core Support Assembly", pp. 648-659, by McGough et al., Nuclear Technology, Nov. 1989.
"Underwater Arc Saw Gets to Work on the Vessel at Japan's JPDR", pp. 35-36 of Nuclear Engineering International,. Sep. 1990 by Yokota et al.
"At The Cutting Edge", pp. 32-33 of Nuclear Engineering International, Jul. 1989.

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