Resources Contact Us Home
Method and apparatus for measuring reactivity of fissile material

Image Number 5 for United States Patent #4493810.

Given are a method and apparatus for measuring nondestructively and non-invasively (i.e., using no internal probing) the burnup, reactivity, or fissile content of any material which emits neutrons and which has fissionable components. No external neutron-emitting interrogation source or fissile material is used and no scanning is required, although if a profile is desired scanning can be used. As in active assays, here both reactivity and content of fissionable material can be measured. The assay is accomplished by altering the return flux of neutrons into the fuel assembly. The return flux is altered by changing the reflecting material. The existing passive neutron emissions in the material being assayed are used as the source of interrogating neutrons. Two measurements of either emitted neutron or emitted gamma-ray count rates are made and are then correlated to either reactivity, burnup, or fissionable content of the material being assayed, thus providing a measurement of either reactivity, burnup, or fissionable content of the material being assayed. Spent fuel which has been freshly discharged from a reactor can be assayed using this method and apparatus. Precisions of 1000 MWd/tU appear to be feasible.

  Recently Added Patents
Proton conducting electrolytes with cross-linked copolymer additives for use in fuel cells
Method of operating a split gate flash memory cell with coupling gate
Monitoring device, monitoring method and non-transitory computer readable medium
Advertising apparatus
Catalytic pyrolysis using UZM-44 aluminosilicate zeolite
ZNF217 a new prognostic and predictive biomarker of recurrent invasive and metastatic phenotypes in breast cancer
  Randomly Featured Patents
Automatic profile updating for a wireless communication device
Induction sensor having conductive concentrator with measuring gap
Method and apparatus for varying laser intensity level
Fuel metering control system for internal combustion engine
Silanol-free resins
Reproducing apparatus, system LSI, and initialization method
Safety belt system with emergency retraction capability
Hydraulic drive for electrical switches
Durable EMI/RFI shield between two or more structural surfaces and shield formed therefrom
Apparatus and method for transmitting/receiving data in a CDMA mobile communication system