Induced nuclear reactions: processes – systems – and elements – Reactor protection or damage prevention – Corrosion or damage prevention
Patent
1987-10-02
1990-01-16
Maples, John S.
Induced nuclear reactions: processes, systems, and elements
Reactor protection or damage prevention
Corrosion or damage prevention
G21C 101
Patent
active
048942022
ABSTRACT:
Disclosed is a method and apparatus for inhibiting radioactive substances eluting into cooling water of a nuclear plant. The method uses an index consisting of an amount of iron adhered onto the fuel cladding surface, that is calculated from the iron concentration of the cooling water and the operation time. A formation of a layer of the iron oxide on the fuel cladding surface is confirmed based upon the covering ratio of 100%. When the covering ratio is smaller than 100%, the iron concentration in the cooling water is controlled to remain constant at a maximum concentration. The Fe/Ni molar concentration ratio in the cooling water is adjusted to be set from about 2 to 10 after the layer of iron oxide reaches a covering ratio of 100%. .sup.58 Co ion and .sup.60 Co ion concentrations in the cooling water can be decreased without greatly increasing the concentration of precipitating radioactive crud, and the surface dosage in the primary system can be decreased at the time of regular checking.
REFERENCES:
patent: 3142625 (1964-07-01), Wellborn
patent: 4476047 (1984-10-01), Bonnici et al.
patent: 4526626 (1985-07-01), Carter
patent: 4722823 (1988-02-01), Honda et al.
Asakura Yamato
Karasawa Hidetoshi
Nagase Makoto
Ohsumi Katsumi
Sakagami Masaharu
Hitachi , Ltd.
Maples John S.
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