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Title: Method and apparatus for manufacturing gas tags

For use in the manufacture of gas tags employed in a gas tagging failure detection system for a nuclear reactor, a plurality of commercial feed gases each having a respective noble gas isotopic composition are blended under computer control to provide various tag gas mixtures having selected isotopic ratios which are optimized for specified defined conditions such as cost. Using a new approach employing a discrete variable structure rather than the known continuous-variable optimization problem, the computer controlled gas tag manufacturing process employs an analytical formalism from condensed matter physics known as stochastic relaxation, which is a special case of simulated annealing, for input feed gas selection. For a tag blending process involving M tag isotopes with N distinct feed gas mixtures commercially available from an enriched gas supplier, the manufacturing process calculates the cost difference between multiple combinations and specifies gas mixtures which approach the optimum defined conditions. The manufacturing process is then used to control tag blending apparatus incorporating tag gas canisters connected by stainless-steel tubing with computer controlled valves, with the canisters automatically filled with metered quantities of the required feed gases. 4 figs.
Inventors:
;
Issue Date:
OSTI Identifier:
415721
Assignee:
Univ. of Chicago, IL (United States) PTO; SCA: 220200; PA: EDB-97:013311; SN: 97001714598
Patent Number(s):
US 5,586,157/A/
Application Number:
PAN: 8-174,146; TRN: 97:001289
Contract Number:
W-31109-ENG-38
Resource Relation:
Other Information: PBD: 17 Dec 1996
Research Org:
Univ. of Chicago, IL (United States)
Country of Publication:
United States
Language:
English
Subject:
22 NUCLEAR REACTOR TECHNOLOGY; GASES; ISOTOPE RATIO; COMPUTER-AIDED MANUFACTURING; FAILED ELEMENT MONITORS; CALIBRATION; MIXTURES; REACTOR MONITORING SYSTEMS

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