Resources Contact Us Home
Method of inhibiting radioactive substances from eluting into cooling water in a nuclear plant and an apparatus therefor

Image Number 2 for United States Patent #4894202.

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.

  Recently Added Patents
Electrode assembly with centrally wound separator member
Systems and methods for providing power and data to lighting devices
Advertisement in operating system
Real-time demand prediction in a fast service restaurant environment
2,2'-binaphthalene ester chiral dopants for cholesteric liquid crystal displays
Flat panel display
System and method for creating, managing and trading hedge portfolios
  Randomly Featured Patents
Sense amplifier with low power in a semiconductor device
Memory controller, flash memory system having memory controller and method for controlling flash memory device
Bottle with handle
Pipe patching clamp
Arrangement for recording characters composed of matrix-like rastered character elements
Insert for video cassette package
Cooperative biometrics abnormality detection system (C-BAD)
System and method for controlling mass storage class digital imaging devices
Lead-in for trim assembly
Transient robust channel for communication systems