Tokyo: A Japanese power firm on Saturday said that it would halt operations at a nuclear reactor because of a technical failure, placing further strain on the country's power supply.

Kansai Electric Power Co said it would manually shut down reactor No 1 at its Ooi plant in central Japan because of a temporary pressure drop in a standby tank.

The tank contains boric acid solution that can be pumped in to slow nuclear fission in case of emergency.

Pressure in the tank had already returned to the correct level, but the company decided to shut down the reactor "to give the top priority to safety and find out the cause," a company spokesman said.

The company did not yet know when the reactor would resume operations but there had been no radiation leak, he said.

The stalled reactor is one of four at the Ooi plant and has a capacity of 1.18 million kilowatts. It provides four percent of the power generated by the company, according to
A news agency.
Japan is already sweltering in the summer heat as it seeks to save electricity and avoid blackouts, with many nuclear reactors remaining shut after the March 11 earthquake
and tsunami.

Utilities not directly affected by the twin disasters have held back from restarting reactors that were under maintenance at the time or entered regular check-ups after the
disaster.

As a result only 19 of Japan's 54 reactors are now operating.

(Agencies)