The Federation of Electric Power Companies admitted Wednesday that it failed to disclose data it compiled in February 1996 on the cost of burying spent nuclear fuel.

The federation estimate shows that the cost of burying spent nuclear fuel is about 30 percent lower than recycling it.

The federation, which consists of 10 power utilities in Japan, is under no obligation to publicize such data, but trust in nuclear power policy may be eroded due to the failure by the government and the power industry group to disclose crucial information, critics claim.