Induced nuclear reactions: processes – systems – and elements – Detection of radiation by an induced nuclear reaction – By fission
Patent
1979-05-18
1982-04-20
Cangialosi, Sal
Induced nuclear reactions: processes, systems, and elements
Detection of radiation by an induced nuclear reaction
By fission
376254, 376257, G21L 1700
Patent
active
043257852
ABSTRACT:
An accurate determination of whether the reactivity of individual spent fuel assemblies exceeds a threshold value is made while each assembly is being transferred from the reactor core to the fuel storage rack. The reactivity of each spent assembly is compared with that of a standard assembly by comparing the subcritical multiplication resulting from insertion of a neutron source into the assemblies. The measuring apparatus preferably exteriorly resembles a control element assembly wherein one control element finger containing the neutron source is yoked to another finger containing a neutron detector. The fingers are simultaneously inserted into a standard assembly having a known reactivity and subcritical multiplication, and the resulting flux signal is recorded. Thereafter spent assemblies are sequentially measured to assure that no assembly having a subcritical multiplication greater than that of the standard is ever placed into the storage rack.
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Trans. Am. Nuc. Soc., vol. 23, pp. 95-96, (1976), Ragen et al., (II).
Klotz Robert J.
Stephen Donald W.
Cangialosi Sal
Combustion Engineering Inc.
Ristas L. James
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