- Summary- Rosatom warns of nuclear accident- Kremlin concerned by shelling- IAEA calls it a 'close call'- Moscow blames Ukraine, Kyiv blames RussiaLONDON, Nov 21 (Reuters) - Russia said on Monday that shelling of the Zaporizhzhia nuclear power plant risked unleashing a grave nuclear accident and repeated accusations, denied by Kyiv, that Ukrainian forces were to blame."The plant is at risk of a nuclear accident," Alexei Likhachev, the director general of Russia's Rosatom state nuclear corporation, was quoted as saying by Interfax.The power plant, which is under Russian control, was rocked by heavy shelling on Saturday and Sunday, drawing condemnation from the U.N. nuclear watchdog which said such attacks risked a major disaster.The International Atomic Energy Agency (IAEA) said its mission at the plant had reported damage to a radioactive waste and storage building, cooling pond sprinkler systems, an electrical cable to one of the reactors, condensate storage tanks, and to a bridge between another reactor and its auxiliary buildings."I think the large distance between Washington and Zaporizhzhia should not be an argument for the United States to delay the decision on a security zone," Interfax quoted him as saying."