Slovakia's prime minister said Tuesday he wants more than twice as much EU cash to fully decommission two Soviet-era nuclear reactors that were closed after the country joined the European Union.

"We will ask for the already allocated 115 million euros ($143 million) to cover the costs of the decommissioning process to be raised to at least 300 million euros," Robert Fico told journalists in Bratislava.

"Otherwise we won't continue," the Slovakian premier warned.

"Right now we can't afford to spend money on decommissioning two reactors that we didn't want to decommission in the first place," Fico explained.

Slovakia, where nuclear energy covers 55 percent of overall demand, closed two VVER-440/230 reactors near Jaslovske Bohunice, northeast of Bratislava, in 2006 and 2008 to honor a pledge made before Slovakia's 2004 EU accession.

Fico, who had already criticised the decision to close the reactors, emphasized that "recent stress tests showed our nuclear plants are in a good condition."

The dominant Slovak power producer Slovenske Elektrarne (SE), controlled by Italian energy group Enel, still operates two units at Jaslavske Bohunice along with two at another nuclear power plant in Mochovce, western Slovakia.

SE expects to launch two more generators at Mochovce in 2013.