NON-DESTRUCTIVE DETERMINATION OF FISSION GAS RELEASE IN RAMP TESTED LWR FUEL RODS
Three methods of non-destructive determination (NDE) of fission gas release in LWR fuel rods will be presented: (1) A NDE method based on gamma spectrometric evaluation of 85-Kr activity in the fuel rod plenum region: This method has been applied since 1980 at HFR for all ongoing LWR transient test programmes. In addition to a description of the NDE technique used, the data from the destructive PIE and the 85-Kr method is reviewed. The 85-Kr method offers, at low costs and within a short time interval after the irradiation is terminated, the possibility of determining the fission gas release of a fuel rod exposed to multiple power ramps at different burnup levels after each consecutive transient test. (2) A quasi NDE method based upon the conventional fission gas release measuring technique, but using a laser based puncturing and welding device in a hot cell: This device provides the capability of puncturing, refilling and resealing of the puncture by welding of fuel rods, thus facilitating intermediate fission gas analysis, re-irradiation, storage and reprocessing of a non-defective fuel rod. (3) Another quasi NDE method using the conventional technique of analysing fission gas release, but providing re-instrumentation of pre-irradiated fuel rods with pressure sensors and a sampling connection with valve facilitating in-pile transient fission gas release monitoring and intermediate fission gas analysis: A new irradiation device at the HFR offers these features. The re-instrumentation procedure and the method of fission gas sampling, void volume determination and refilling will be described.
Bibliographic Reference: IAEA SPECIALISTS' MEETING ON POST IRRADIATION EXAMINATION AND EXPERIENCE, TOKYO (JAPAN), NOV. 26-30, 1984 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 31878 ORA
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Record Number: 1989123033400 / Last updated on: 1987-01-01
Available languages: en