There has been no official request from Japan for Russian nuclear specialists, Emergency Situations Ministry spokeswoman Irina Andrianova said on Thursday.
"Russia has received no such request from Japan," she said.
Russian Foreign Ministry spokesman Alexander Lukashevish said earlier in the day Russia was ready to provide Japan any assistance in putting out fires at its quake-affected nuclear power plants.
The water level in a spent nuclear fuel pool at Fukushima No. 1 plant has dropped, creating the possibility of a meltdown, the container of the No. 3 reactor has possibly been damaged and the fuel in the No. 1, 2 and 3 reactors is no longer fully covered with coolant, The Mainichi Daily said.
It warned that if no effective countermeasures are implemented the fuel will melt which could result in a radiation leak.
A series of blasts and fires damaged four of Fukushima's six reactors after a 9.0-magnitude earthquake struck off the northeast coast of Japan last week, sparking a powerful tsunami and killing thousands.
MOSCOW, March 17 (RIA Novosti)