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
Vehicle control apparatus
Managing job execution
Sampling switch circuit that uses correlated level shifting
Aspect ratio enhancement
Touch-sensitive device and communication device
Detection of procedural deficiency across multiple business applications
Soybean cultivar CL0911444
  Randomly Featured Patents
Method for producing alumina template of nanorods, alumina template, and nanorods
Body thermoregulation using skin temperature feedback
Waterfast inks
Illuminated electrical center
Query scheduling in a parallel-processing database system
Dipper and mixer driveway and roof spreader brush
Fibrin sealant compositions and methods for utilizing same
Direct identification and mapping of RNA transcripts
Infusion pump with tube spike holder
Cut sheet tray having a weighted pivoting jam prevention member