Nuclear reactor vessel decontamination systems

Details Nuclear reactor vessel decontamination systems Nuclear reactor vessel decontamination systems

1981-03-09

1985-01-29

Schafer, Richard E.

Induced nuclear reactions: processes, systems, and elements

Fission reactor material treatment

Impurity removal

376309, 376260, 239185, 134168R, 1510401R, G21C 1900, B05B 300, B08B 300

Patent

active

044965192

ABSTRACT:
There is disclosed in the present application, a decontamination system for reactor vessels. The system is operatable without entry by personnel into the contaminated vessel before the decontamination operation is carried out and comprises an assembly which is introduced into the vertical cylindrical vessel of the typical boiling water reactor through the open top. The assembly includes a circular track which is centered by guideways permanently installed in the reactor vessel and the track guides opposed pairs of nozzles through which water under very high pressure is directed at the wall for progressively cutting and sweeping a tenacious radioactive coating as the nozzles are driven around the track in close proximity to the vessel wall. The whole assembly is hoisted to a level above the top of the vessel by a crane, outboard slides on the assembly brought into engagement with the permanent guideways and the assembly progressively lowered in the vessel as the decontamination operation progresses. The assembly also includes a low pressure nozzle which forms a spray umbrella above the high pressure nozzles to contain radioactive particles dislodged during the decontamination.

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