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Title: Expert system for identification of simultaneous and sequential reactor fuel failures with gas tagging

Failure of a fuel element in a nuclear reactor core is determined by a gas tagging failure detection system and method. Failures are catalogued and characterized after the event so that samples of the reactor's cover gas are taken at regular intervals and analyzed by mass spectroscopy. Employing a first set of systematic heuristic rules which are applied in a transformed node space allows the number of node combinations which must be processed within a barycentric algorithm to be substantially reduced. A second set of heuristic rules treats the tag nodes of the most recent one or two leakers as background'' gases, further reducing the number of trial node combinations. Lastly, a fuzzy'' set theory formalism minimizes experimental uncertainties in the identification of the most likely volumes of tag gases. This approach allows for the identification of virtually any number of sequential leaks and up to five simultaneous gas leaks from fuel elements. 14 figs.
Inventors:
Issue Date:
OSTI Identifier:
6989853
Assignee:
Univ. of Chicago, IL (United States) PTO; EDB-94-129743
Patent Number(s):
US 5333157; A
Application Number:
PPN: US 8-118151
Contract Number:
W-31109-ENG-38
Resource Relation:
Patent File Date: 8 Sep 1993
Country of Publication:
United States
Language:
English
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; FAILED ELEMENT DETECTION; EXPERT SYSTEMS; FAILED ELEMENT MONITORS; FUZZY LOGIC; REACTOR MONITORING SYSTEMS; DETECTION; MATHEMATICAL LOGIC; MEASURING INSTRUMENTS; MONITORS; 220400* - Nuclear Reactor Technology- Control Systems