In December 1995, the Monju fast-breeder reactor at Tsuruga sprang a leak in its sodium-cooling circuitry.

ECONOMIST: Japan

Though no radiation was released and no one died, three tons of liquid sodium burst from Monju's cooling circuits.

ECONOMIST: Japan

Unless Japan Atomic Energy can present new information that contradicts the authority's findings by May 23, it will have to suspend its work to proceed with the Monju project except maintenance for safety, the statement said.

WSJ: Panel: Active Fault Runs Beneath Japan Reactor