Induced nuclear reactions: processes – systems – and elements – Testing – sensing – measuring – or detecting a fission reactor... – Leak detection
Patent
1983-09-26
1985-01-22
Cangialosi, Sal
Induced nuclear reactions: processes, systems, and elements
Testing, sensing, measuring, or detecting a fission reactor...
Leak detection
376250, 376253, G21C 1704
Patent
active
044951434
ABSTRACT:
The invention discloses the use of stable isotopes of neon and argon, that are grouped in preselected different ratios one to the other and are then sealed as tags in different cladded nuclear fuel elements to be used in a liquid metal fast breeder reactor. Failure of the cladding of any fuel element allows fission gases generated in the reaction and these tag isotopes to escape and to combine with the cover gas held in the reactor over the fuel elements. The isotopes specifically are Ne.sup.20, Ne.sup.21 and Ne.sup.22 of neon and Ar.sup.36, Ar.sup.38 and Ar.sup.40 of argon, and the cover gas is helium. Serially connected cryogenically operated charcoal beds are used to clean the cover gas and to separate out the tags. The first or cover gas cleanup bed is held between approximately 0.degree. and -25.degree. C. operable to remove the fission gases from the cover gas and tags and the second or tag recovery system bed is held between approximately -170.degree. and -185.degree. C. operable to isolate the tags from the cover gas. Spectrometric analysis further is used to identify the specific tags that are recovered, and thus the specific leaking fuel element. By cataloging the fuel element tags to the location of the fuel elements in the reactor, the location of the leaking fuel element can then be specifically determined.
REFERENCES:
patent: 3632470 (1972-01-01), Rubin et al.
patent: 4012490 (1977-03-01), Lofredo
patent: 4135970 (1979-01-01), Mitsutsuka et al.
patent: 4347214 (1982-08-01), Sato et al.
Handbook of Applied Engineering Science (1970), pp. 27-29, Bolz et al.
Gross Kenny C.
Laug Matthew T.
Cangialosi Sal
Lind Charles F.
The United States of America as represented by the United States
Weinberger James W.
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