'Japan's nuclear stockpile excessive'

China has added its voice to international concerns over Japan's large stockpile of nuclear materials, saying the Japanese have exceeded their needs in nuclear power.

Such a large stockpile increases security risks, said Chen Kai, secretary-general of the China Arms Control and Nuclear Disarmament Association, said at a briefing on Monday before the plenary of the Nuclear Security Summit.

"The international community has found that Japan has stocked excessive amounts of nuclear material that surpasses its actual necessities of nuclear power," Chen said.