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August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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BWXT will scout potential TRISO fuel production sites in Wyoming
BWX Technologies Inc. announced today that its Advanced Technologies subsidiary has signed a cooperation agreement with the state of Wyoming to evaluate locations and requirements for siting a potential new TRISO nuclear fuel fabrication facility in the state.
J. R. Trinko, Jr., S. H. Hanauer
Nuclear Technology | Volume 8 | Number 6 | June 1970 | Pages 522-530
Technique | doi.org/10.13182/NT70-A28652
Articles are hosted by Taylor and Francis Online.
A pulse-mode neutron detection system designed for reactor noise measurements was characterized and compared with conventional current-mode noise measurement systems. Pulses from a proportional counter with a 60-nsec electron collection time were amplified and applied to a discriminator and thence to a counting-rate circuit with a time constant of 15 µsec. Statistical fluctuations in the counting-rate voltage were frequency analyzed. Under conditions of negligible gamma flux and counting loss, the pulse system yielded frequency spectra indistinguishable from ion-chamber spectra. The results were not very sensitive to counting loss up to at least 20%, but the effect of counting loss limited the ultimate useful neutron flux for the system tested to <2 × 106 n/(cm2 sec). Space charge and gamma pileup in the detector controlled the performance of the pulse system in high gamma fluxes; the pulse system performed better than the best available current system over a limited range of neutron- and gamma-flux intensities. Because of its shorter time constant, the pulse-mode system can be used to measure power spectral density at much higher frequencies than the current-mode system. Thus, the pulse-mode system appears to be the more attractive for fast reactor subcriticality measurements.