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
Hemostatic devices and methods of making same
Image forming apparatus detecting color patterns and generating interleaf images at predetermined position
MOS transistor having combined-source structure with low power consumption and method for fabricating the same
Shared system to operationally connect logic nodes
Specimen preparation device, and control method in specimen preparation device
Local access to data while roaming with a mobile telephony device
Modular storage system
  Randomly Featured Patents
Clarification of xanthan gum
Process for mycelial culture using grain
Fluid directing method and apparatus for aiding the shaping, polishing and smoothing of work piece by sanding
Method of making compressible printing roller
VRAM-based parity engine for use in disk array controller
Device for secret registration of display data
System and method for user support based on user interaction histories
Multiple mailbox mount
Numerical control system with plural groups of miscellaneous functions
Advanced ethernet auto negotiation