Fugen (Japan)

Map of Fugen

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HWLWR 150 MW in operation since 1978, shut down in 2003.

Facilities in Fugen

plantreactor typconstruction startoperation startshut down

The reactor is due to cease operation in March 2003. Decommissioning will take 40 years. Officials estimate they must get rid of 370,000 tons of waste.


A leak was detected involving a tritium leak outside of the reactor container and the concrete wall surrounding the facility.


Reactor manually shut down due to level of noble gasses storage equipment monitoring system and level of off-gasses chimney monitoring system during test operation; leak found at two special fuel assemblies.
(source: http://cnic.jp/english/)


The reactor was shut down because of a leakage of radioactive steam. The decision was particularly embarrassing as the accident followed close on the heels of the release of a new white paper on nuclear safety that reported that the safety record has in fact improved.


Reactor manually shutdown due to tritium leak at helium circular system piping.
(source: http://cnic.jp/english/)


Fugen scrammed Friday, June 5, apparently due to what officials call an operator's trivial error.
The Reactor Regulatory Division Director of Science & Technology Agency Kenichi Takeyama told "The technical issue is the fact that the wrong fuse was removed, but I have to wonder why it took such a long time for Power Reactor & Nuclear Fuel Development Corp (PNC) to report it.


The Fugen NP station stopped operation at 10.31 p.m.
a radiation leak occurred when heavy water, containing the radioactive material tritium, leaked from a water purification system located in a separate building from the reactor.
The size of the leakage was very small and had caused no damage to the environment.
The cause of the leak was a loose bolt, which has been tightened, he said.
The accident was not reported to local or central authorities until 30 hours later.
The Science and Technology Agency (STA) found on 27 May that a workers' operational mistake caused the automatic shut The STA found that the insert ratio of control rods had been 8% at the time of the automatic shut down, whereas it should have been 5% according to operation manuals. The agency concluded that it caused a sharp decrease of the output of the reactor, which resulted in boiling of wate in the moisture separator.

YOS 28/5


Turbine trip due to rotation anomaly.


Steam leak from high presssure turbine pipe, reactor manually stopped. some 50 liters of water spilled on the floor.


Failure of fuel replacement system


Short circuit in power supply board for ECCS