Inhibition of nuclear-reactor coolant-circuit contamination

Details Inhibition of nuclear-reactor coolant-circuit contamination Inhibition of nuclear-reactor coolant-circuit contamination

1988-12-15

1991-01-01

Wasil, Daniel D.

Induced nuclear reactions: processes, systems, and elements

Reactor protection or damage prevention

Corrosion or damage prevention

G21C 1930

Patent

active

049816411

ABSTRACT:
A method of inhibiting or reducing contamination of out-of-core components of the primary coolant circuit of a pressurized water reactor due to absorption by oxide films of such components of cobalt and other radioactive contaminants generated by neutron irradiation of coolant impurities while in the reactor core. The method consisting of intermittently (e.g. at reactor shutdown for maintenance purposes), and/or once-off during commissioning of the reactor, holding the temperature of the circulating coolant within a suitable range below normal operating temperature for an extended period while maintaining its boric acid concentration substantially higher than during normal operation. Inhibition of absorpotion by component oxide films persists long-term and predisposes to preferential and improved removal of contamination by the usual purification equipment which operates continuously during normal operation of the reactor.

REFERENCES:
patent: 4684494 (1987-08-01), Dagard
patent: 4722823 (1988-02-01), Honda et al.
patent: 4759900 (1988-07-01), Peterson et al.
patent: 4764337 (1988-08-01), Panson
patent: 4820473 (1989-04-01), Ohashi et al.
"Effect of Cooling and Oxidation at the Time of Shutdown in PWRs", Beslu et al., IAEA-SM-264/5, Nov. 1982.
"Radiation Field Control at LWRs", NEI, Nov. 1987, pp. 27-30.
"Getting to Grips with Water Chemistry and Corrosion", NEI, Mar. 1983, pp. 53-55.

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