Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Corrosion or damage prevention
Patent
1992-12-31
1994-12-27
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
Reactor protection or damage prevention
Corrosion or damage prevention
376310, 376313, G21C 900
Patent
active
053772440
ABSTRACT:
The reactor coolant system (RCS) of a pressurized water reactor (PWR) is chemically decontaminated and cleaned utilizing apparatus which is comprised of components designed to operate at low pressures while still utilizing installed reactor coolant pumps and/or the residual heat removal pumps to generate the high flow rates required for the process. A high volume diverted flow of reactor coolant from the RCS is passed through letdown valves to reduce the high pressure produced by the installed pumps. Chemical decontamination and cleaning agents are mixed with the low pressure diverted flow and returned to the RCS by high head injection pumps. Contamination solubilized by the decontamination and cleaning agents is removed as the reactor coolant is recirculated through demineralizers. Filters remove particulates, and fines from the demineralizer resins. A surge tank, which may or preferably is not, in the path of the diverted flow provides reactor coolant for backwashing the demineralizers and filters and downloading the demineralizer resins.
REFERENCES:
patent: 3783268 (1974-01-01), Neeb et al.
patent: 4684494 (1987-08-01), Dagard
patent: 4699755 (1987-10-01), Dagard et al.
patent: 4842812 (1989-06-01), Panson et al.
patent: 5082618 (1992-01-01), Dagard
Voss Frederick H.
Walsh Donald P.
Westinghouse Electric Corp.
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