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Abstract

Neutron and gamma ray measurements made on 22 LWR spent fuel elements at the Obrigheim Nuclear Power Station in Germany were used successfully to: demonstrate that the elements had radiation characteristics attributable to spent fuel elements, and verify that operator declared information for the elements was consistent. All measured neutron and gamma signals could be analyzed with currently recommended procedures. Elements with interrupted irradiation histories were generally identifiable. The need to be able to make corrections for 242-Cm build-up in neutron data and for the short-lived fission products in gamma data is evident; further analysis will be made. In addition to the LWR elements one fresh and one irradiated MOX element were measured. Some specific results: The burn up of fuel elements can be determined from the neutron measurements to within about 5%. Different irradiation histories of fuel elements are detectable. From 15 measurements over 2 days a variation of 2.8% was observed for the neutron and of 1.9% for the gamma measurements. The gamma background was about constant (about 9 units/s) over the storage rack. Consistency of operator declared total Pu content can be checked by using the neutron measurement. Assembly, handling, disassembly and decontamination of FORK detector can be done in reasonable time.

Additional information

Authors: SCHENKEL R, CEC LUXEMBOURG;LOS ALAMOS NATIONAL LABORATORIES, LOS ALAMOS, NEW MEXICO (USA);BOSLER G, CEC LUXEMBOURG;LOS ALAMOS NATIONAL LABORATORIES, LOS ALAMOS, NEW MEXICO (USA);KLOSTERBUER S CEC LUXEMBOURG, CEC LUXEMBOURG;LOS ALAMOS NATIONAL LABORATORIES, LOS ALAMOS, NEW MEXICO (USA);LOS ALAMOS NATIONAL LABORATORIES, LOS ALAMOS, NEW MEXICO (USA), CEC LUXEMBOURG;LOS ALAMOS NATIONAL LABORATORIES, LOS ALAMOS, NEW MEXICO (USA)
Bibliographic Reference: EUR 9877 EN (1985) MF, 48 P., BFR. 150, BLOW-UP COPY 240, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
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