Apparatus for in situ determination of burnup, cooling time and

Induced nuclear reactions: processes – systems – and elements – Testing – sensing – measuring – or detecting a fission reactor... – Fuel assay

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376254, G21C 1700

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active

045101175

ABSTRACT:
A detector head for in situ inspection of irradiated nuclear fuel assemblies submerged in a water-filled nuclear fuel storage pond. The detector head includes two parallel arms which extend from a housing and which are spaced apart so as to be positionable on opposite sides of a submerged fuel assembly. Each arm includes an ionization chamber and two fission chambers. One fission chamber in each arm is enclosed in a cadmium shield and the other fission chamber is unshielded. The ratio of the outputs of the shielded and unshielded fission chambers is used to determine the boron content of the pond water. Correcting for the boron content, the neutron flux and gamma ray intensity are then used to verify the declared exposure, cooling time and fissile material content of the irradiated fuel assembly.

REFERENCES:
patent: 4325785 (1982-04-01), Klotz et al.
patent: 4335466 (1982-06-01), Lee
LA-9002-MS, "Neutron Measurement Techniques for the Nondestructive Analysis of Irradiated Fuel Assemblies", Phillips et al., (11/81).
LA-9438-MS, "Nondestructive Verification with Minimal Movement of Irradiated LWR Fuel Assemblies", Phillips et al., 10/82.
IEEE Trans. Nucl. Sci., NS-29, No. 1, 858-862, (2/82), Halbig et al.

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