Anti-nuclear groups in Japan are trying to stop an energy company from loading fuel manufactured by British Nuclear Fuels into one of its reactors, because they claim it may not be safe.
Pressure groups Green Action and Mihama no Kai are seeking an injunction to stop Kansai Electric loading the mixed-oxide (Mox) fuel into the number four reactor at its Takahama plant.
Mox fuel ran into controversy last September when BNFL admitted workers at its Sellafield fabrication plant had falsified quality-control documentation.
The company insisted this had not affected a consignment of fuel already shipped to Japan.
The anti-nuclear groups maintain that discrepancies between automatic and random measurements of the first consignment indicate that some manipulation had taken place.
A BNFL spokesman said Kansai and the Japanese regulator were satisfied that there had been no falsification of documentation.