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
2-aryl-4-quinazolinones and their pharmaceutical compositions
Parallel processing computer systems with reduced power consumption and methods for providing the same
Image heating device
Soliciting first party in communication session to maintain call when degradation of connection to second party is anticipated
Management of temporal data by means of a canonical schema
Starch networks as absorbent or superabsorbent materials and their preparation by extrusion
Socket type MEMS device with stand-off portion
  Randomly Featured Patents
Speaker damper
Vacuum cleaner-blower assembly with sound absorbing arrangement
Device for holding and drying sports apparel
Wireless communication scheme with communication quality guarantee and copyright protection
Tire pressure monitoring apparatus and method
Closure system for vehicles
Switching device with a power FET and an inductive load
Automobile interior headliner molding or forming member and an automobile interior headliner member using the same
Garment drying apparatus