(Repeats story published late on Monday)
By Peter Laca
BRATISLAVA, Jan 12 (Reuters) - Slovakia said on Monday it would decide within hours whether to restart a Soviet-era nuclear reactor, a plan that would put it on a collision course with a highly critical European Union.
The government has begun preparatory work needed to restart the 440 MW unit at the Jaslovske Bohunice power station. Prime Minister Robert Fico said on Monday the decision would depend on whether Slovakia received an assurance that Russian gas supplies would resume.
Last week Bratislava declared a state of emergency after the flow of Russian gas stopped and the government said the Bohunice unit, closed at the end of 2008, had to be put into operation again to maintain the stability of the power grid.
"I will check the situation when I return home, I will speak with the prime minister and then I will decide what to do next," the news agency SITA quoted Economy Minister Lubomir Jahnatek as saying after a meeting of EU energy ministers in Brussels.
Fico also said Jahnatek would decide whether to restart the Bohunice unit. Ministry officials were not available for comment.
Russia and Ukraine rescued a deal that could get Russian gas flowing again via Ukraine to Europe on Tuesday after a contract dispute had cut off supplies for nearly a week.
The deal signed in Brussels on Monday set out the procedures for international observers to deploy to strategic points along the gas export route to check no gas is being stolen -- a condition set by Russia for resuming supplies.
SUPPLIES RESUME ON TUESDAY
Alexander Medvedev, the deputy chief executive of Russia's state gas export monopoly Gazprom, said gas supplies should be restarted at 0700 GMT on Tuesday "if there are no obstacles".
Even before the gas deal was signed, Fico sounded less certain about restarting the Bohunice reactor on Monday than he had done in statements made over the weekend.
He and Jahnatek said at the weekend the unit would resume operations and stay connected to the grid until gas supplies were stabilised and Slovak gas storage tanks were full again.
The Bohunice nuclear reactor was shut down in December 2008 to comply with Slovakia's EU accession agreement.
A spokesman for the European Commission, the EU's executive arm, said any attempt to restart the unit at Bohunice would break European Union rules.
"It will be a serious violation of primary law of the EU and the Comission will react in consequence," he said. He added the Commission would listen to Slovakia's arguments for restarting the unit.
Neighbouring Austria has also protested against the plan to restart the Bohunice unit, saying the reactor was not safe.
The EU accession agreement, setting terms for Slovakia's entry to the bloc in 2004, had forced Bratislava to close another unit at the Soviet-designed Bohunice in 2006.
Leftist leader Fico had opposed the accession deal, agreed by the previous centre-right administration his government replaced two years ago, and has repeatedly said the Bohunice facility met all safety standards.
The gas dispute, which began when Russia and Ukraine could not agree on the price Ukraine should pay for Russian gas this year, has intensified calls for alternative energy sources.
Slovakia's southern neighbour, Hungary, has also said it needs to consider whether to build new nuclear power generating capacity. (Additional reporting by Boris Groendahl in Vienna and Marcin Grajewski in Brussels; editing by Tim Pearce)