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filingDate 1988-11-17-04:00^^<http://www.w3.org/2001/XMLSchema#date>
grantDate 1990-07-03-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_69cbbdd5fcf4933dd811b8fa6028e0aa
http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_344e6127a76593b7d7c8b24c9c037777
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publicationDate 1990-07-03-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber US-4938917-A
titleOfInvention Nuclear reactor with internal thimble-type delayed neutron detection system
abstract This invention teaches improved apparatus for the method of detecting a breach in cladded fuel used in a nuclear reactor. The detector apparatus is located in the primary heat exchanger which conveys part of the reactor coolant past at least three separate delayed-neutron detectors mounted in this heat exchanger. The detectors are spaced apart such that the coolant flow time from the core to each detector is different, and these differences are known. The delayed-neutron activity at the detectors is a function of the delay time after the reaction in the fuel until the coolant carrying the delayed-neutron emitter passes the respective detector. This time delay is broken down into separate components including an isotopic holdup time required for the emitter to move through the fuel from the reaction to the coolant at the breach, and two transit times required for the emitter now in the coolant to flow from the breach to the detector loop and then via the loop to the detector. At least two of these time components are determined during calibrated operation of the reactor. Thereafter during normal reactor operation, repeated comparisons are made by the method of regression approximation of the third time component for the best-fit line correlating measured delayed-neutron activity against activity that is approximated according to specific equations. The equations use these time-delay components and known parameter values of the fuel and of the part and emitting daughter isotopes.
isCitedBy http://rdf.ncbi.nlm.nih.gov/pubchem/patent/US-2007069145-A1
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priorityDate 1988-11-17-04:00^^<http://www.w3.org/2001/XMLSchema#date>
type http://data.epo.org/linked-data/def/patent/Publication

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Total number of triples: 37.