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Abstract

Since 1986, a sealing technique has been studied and tested by JRC-Ispra at the Sellafield plant, aimed at the safeguarding of spent fuel containers. In this technique a special sealing-bolt is used to replace one of the bolts which close the lid of these special BNFL containers, called MultiElement Bottles (MEB). The sealing-bolts (SB) can be easily installed on a MEB and verified underwater thanks to adequate tools and an ultrasonics/electronics portable instrument. In mid 1990 the decision was made to carry out a field test involving at least 50 SBs. During the following 15 month period 53 MEBs were sealed in a transfer bay, of which 36 were successfully reverified after their transportation into the new THORP storage pond. Using new tools, 10 SBs were properly broken for demonstration purposes and 5 were removed. The field test was completed to the satisfaction of Euratom and IAEA inspectors and the equipment remains on site for future routine use.

Additional information

Authors: D'AGRAIVES B C ET AL., JRC Ispra (IT);JEFFREY A, CEC Luxembourg (LU);DETOURBET P, CEC Luxembourg (LU);REYNOLDS A, British Nuclear Fuel Ltd., Sellafield (GB);WARREN R, British Nuclear Fuel Ltd., Sellafield (GB);OLSEN R, International Atomic Energy Agency, Wien (AT)
Bibliographic Reference: Paper presented: INMM 33rd Annual Meeting, Orlando, July 19-22, 1992
Availability: Available from (1) as Paper EN 36983 ORA
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