The UK and Japan have agreed a framework on civil nuclear cooperation, the government has announced.
Prime minister David Cameron, who is currently on his first official visit to Japan, has agreed to assist the Japanese with the decontamination and decommissioning of the Fukushima nuclear site, which was damaged by last year's tsunami.
In return, the Japanese will lend their technical expertise in new plant design and construction.
Speaking about the accord, Charles Hendry, minister of state for energy, said that it would be mutually beneficial for both parties.
"This agreement will open up opportunities for UK firms to work with Japanese industry and to continue to share the UK's world-class expertise, just as we did in the aftermath of Fukushima," he said.
Earlier this year, Mr Cameron came to a similar arrangement with his French counterpart Nicolas Sarkozy.
This partnership will see the two nations collaborating for research and development, education and training, and establish a framework for co-operation on security.