Patent
1975-05-08
1977-08-16
Engle, Samuel W.
176 38, G21C 900
Patent
active
040424553
ABSTRACT:
A process for dissolving radioactive corrosion products from the internal surfaces of a nuclear reactor. In preparation for reactor refueling, the reactor coolant is depressurized and the temperature reduced to .about.140.degree. F. Hydrogen is purged from the system and the coolant repressurized to about 400 psi to permit operation of a reactor coolant circulating pump. A solution containing oxygen, preferably hydrogen peroxide, is injected into the reactor coolant which is then circulated through the reactor. The thus oxygenated coolant effects prompt and nearly complete release, at least 95% complete, of radioactive corrosion products, especially cobalt 58, from the reactor internal surfaces. The coolant is then circulated through a demineralizer which removes such products by ion exchange processes, at the completion of which, the reactor is opened to commence replacing fuel assemblies in the reactor.
REFERENCES:
patent: 3663725 (1972-05-01), Pearl
General College Chemistry 3rd Ed., Keenan et al., Pub; Harper & Row pp. 151 & 152.
Ind. Eng. Chem. vol. 51, No. 10 Oct. 1959 "Coolant Technology" pp. 1262-1264.
Corrosion vol. 17, 1961 "Corrosion of Carbon and Low-Alloy Steels in Out-of-Pile Boiling-W-R Envior," pp. 269-276.
Campbell J. R.
Engle Samuel W.
Palo Ralph
Westinghouse Electric Corporation
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