Nuclear mattersDay nears for restarting Japan's fast-breeder reactor - the world's only such reactor
Monju, the world’s only fast-breeder reactor, achieved criticality in April 1994; in December 1995 a coolant loop leaked more than 700 kilograms of molten sodium, releasing toxic fumes and damaging the plant; plant managers tried to cover up the accident, but covertly recorded videos were leaked to the press; there followed fourteen years of repairs and redesigns of safety measures and attempts to rebuild public trust by Monju’s operator
Japan’s Monju experimental fast-breeder reactor faces one last hurdle before restarting fourteen years after an accident and a botched coverup shut it down: An OK from the governor of Fukui Prefecture, where the reactor is located. Shunsuke Kondo, chair of the Japan Atomic Energy Commission said the other day at a press conference that approval could come in May or June because it will likely take that long for negotiations between the governor and the central government to resolve remaining sticking points (see “Operator of Shut-down Monju Fast Reactor Seeks Resumption of Operations,” 24 February 2010 HSNW).
Science’s Dennis Normile writes that Monju was intended to demonstrate the practicality of using highly fissile plutonium as a nuclear fuel, instead of the uranium used in conventional nuclear power plants. The appeal is that, depending on the configuration, a plant using plutonium as a fuel can produce more plutonium than it consumes. The United States, the United Kingdom, Germany, France, Russia, and Japan built experimental fast reactors in the 1970s, 1980s, and 1990s, but technical problems, costs, and concerns about safeguarding plutonium — an ingredient in nuclear weapons — led every nation but Japan to abandon the technology (see “U.S. Reluctant to Adopt New Nuclear Reactor Technology,” 4 March 2010 HSNW).
Monju achieved criticality in April 1994. In December 1995 a coolant loop leaked more than 700 kilograms of molten sodium, releasing toxic fumes and damaging the plant. Plant managers tried to cover up the accident; covertly recorded videos were leaked to the press.
Kondo explained that a gentlemen’s agreement which may or may not be legally binding gives the local government a veto over restarting the plant if safety concerns have not been addressed (Kondo did not discuss rumors that the governor is holding out for an extension of Japan’s high-speed bullet train lines to the remote prefecture as a condition of approving a Monju restart). Kondo said that the ministers of Education and of Economy, Trade and Industry will meet with the governor to try to resolve the impasse.
