Tokyo Electric Power Co. is to abandon plans to export its nuclear power plant expertise as it struggles to cope with the Fukushima disaster, news reports said Thursday.

The turnaround by one of the world's largest utilities would be a blow to Japan's once-proud policy of promoting its nuclear technology, the Mainichi Shimbun daily said.

Tokyo Electric, known as TEPCO, will withdraw from a scheme to supply and run two nuclear reactors at a plant in Vietnam, the paper said.

The project is being undertaken by International Nuclear Energy Development, a Tokyo-based company set up in 2010 by public funds, heavy machinery makers, and power companies including TEPCO, to promote nuclear power exports.

"Our atomic power engineers still need to do a lot more to stabilise and decommission the reactors" at the crippled Fukushima Daiichi plant, TEPCO president Naomi Hirose said Wednesday according to the Mainichi.

"It is impossible" to abandon the domestic task and promote exports, he was quoted as saying.

TEPCO had been expected to send engineers to the Vietnam plant for operations and maintenance while accepting Vietnamese engineers at its plants, according to Jiji Press news agency.

International Nuclear Energy Development said it had not been informed of any change of plan by TEPCO.

"We have confirmed with Tokyo Electric that it will continue to cooperate in the (Vietnam) project," said an official who declined to be named.

No immediate comment was available from TEPCO.

Tsunami-sparked meltdowns at Fukushima in March 2011 threw Japan into nuclear crisis as leaking reactors polluted vast areas of farmland and forced tens of thousands of people from their homes.

The clean-up is expected to take decades, with scientists warning that some settlements may have to be abandoned.

TEPCO posted a massive 781 billion yen net loss in the fiscal year to March on disaster-related costs, as well as increased imports of fossil fuels to make up for a nuclear power shortfall.

A boisterous shareholders' meeting on Wednesday rubber-stamped the effective nationalisation of the company.