Damage to radiological barriers: Yes

Fuel fail and emission from research reactor

Fuel rods were unloaded October 17 2016, and placed in an open container in the handling compartment. The reactor was then in shutdown. On October 20th increased levels of noble gasses were detected in the filters from the handling compartment. The fuel in the handling compartment was inspected and several faults on fuel rods were detected.
These were moved to a storage container on October 24, however the container was discovered to not be leak tight. The levels of I-131 and I-132 in the Reactor hall were still increasing.

Category: Research Reactor Norway »


Inadvertent damage of a Se-75 source

On December the 12th, 2016, a Se-75 source was inadvertently damaged during re-pair work on faulty radiography equipment. The work was performed in Düsseldorf region in North Rhine-Westphalia by a specialized company within a controlled area. The source contained about 1.3 Terabecquerel Se-75. The radioactive substance was released during the repair work and contaminated persons and zones within and out-side of the controlled area. Besides the two workers performing the repair work, other persons were also contaminated.

Category: Radiation Source Germany »


A sealed radioactive Cs-137 source contaminated the premises of waste management company

Event Abstract:
A sealed radioactive Cs-137 source contaminated the premises of waste management company and also the neighboring rooms used by Finnish Radiation and Nuclear Safety Authority (STUK). The event was found out on 7 March 2016.

The source, activity presently 360 MBq, had been used in a factory in Finland for level gauging and was delivered to waste management company as radioactive waste. When the gauge was received by the company, one of the staff tried to open the source shield in order to remove the actual cesium source for disposal. He did not have information or other indication that the source might not be intact. During the handling of the source contamination was released into the room where gauge was handled and also to adjacent rooms and air exhaust ventilation ducts.

Category: Radiation Source Finland »


Contaminated water being transferred to turbine building of unit 3 from 1000 tons notch tank was leaking from the cracked pressure hose

On 29 May, 2015, TEPCO found that contaminated water being transferred to turbine building of unit 3 from 1000 tons notch tank was leaking from the cracked pressure hose.
TEPCO stopped the inappropriate transfer of contaminated water.
The estimated volume of the leaked water is approximately 7 m3.
Although the leaked water flowed into the drainage which led to the port there has been no significant change in radioactivity of the ocean that raises any concern about influence to health and the environment.

Category: Power Reactor Japan »


Leakages of water from the dikes in tank areas storing contaminated water

TEPCO found that leakages of water accumulated in the dikes due to rainfall in 4 areas storing contaminated water at Fukushima Daiichi NPS between 9 and 14 September 2015.
The dikes are installed in order to prevent contaminated water from spreading in case a leakage from the tanks would occur.

Category: Power Reactor Japan »


Leakage of Contaminated Water from a Flange of Water Pressure Measuring instrument

On 6 February,2014, TEPCO found that the water treated by Simplified Active Water Retrieve and Recovery System (SARRY, cesium removal facility) and Reverse Osmosis Desalination Facility (RO) was leaking from the flange of water pressure measuring instrument equipped to the water pipe in which the water was running to the reactors unit 1 to 3 for their cooling.
The leaked water was flowing into the underground nearly under the water pressure measuring instrument.
The water leakage from the flange was stopped by means of closing the valve attached between the flange and the water pipe.
The amoun

Category: Power Reactor Japan »


Discovery of a Crack in a Connection Valve between Tanks for Concentrated Water Treated by Reverse Osmosis

On 4 September, 2014, TEPCO found that the concentrated water* treated by Reverse Osmosis (RO) was leaking from a connection valve between A5 tank and A6 tank in the G4 South Tank Area.

Category: Power Reactor Japan »


Contaminated water leakage from a water tank

?Regarding the contaminated water leakage from a water tank in the H4 Tank Area at Fukushima Daiichi NPS that was detected on August 19, radioactivities in the leaked water in the dike were found to be:
- Cesium-134: 4.6×101 Bq/cm3
- Cesium-137: 1.0×102 Bq/cm3
- β emitting radionuclides in total: 8.0×104 Bq/cm3
?The amount of the leaked water is estimated to be approximately 300m3, judging from the decrease of water level in the water tank in question.

Category: Power Reactor Fukushima Daiichi »


Leakage of Heavy Water from Feeder Pipe

Plant was in shutdown state since October 05, 2011 because of maintenance activities. As per normal procedure during shutdown state, Standby Cooling System (SH) was in service to remove decay heat from the reactor core while Primary Heat Transport (PHT) system was in depressurized state. On October 19, 2011, inspection of channel S-11 grayloc seal was carried out to find out any foreign material in the orifice. During normalization of the system, Boiler Room (B/R) floor beetle alarm received in control room. Later, 'Tritium in Air High' alarm also annunciated.

Category: Power Reactor Pakistan »


Explosion and fire at Centraco CENTRACO waste processing and conditioning plant

On 12 September 2011 at 11h45 pm (9.45 UTC), the explosion of a furnace used for melting low-level (LL) and very low-level (VLL) metallic radioactive waste triggered a fire at the CENTRACO nuclear installation located in Codolet, adjacent to but separate from Marcoule nuclear site (France, Gard Département). The fire ended at 1.00 pm (11.00 UTC) on the same day.

This explosion caused one worker's death and injuries to four others, including one seriously due to deep burns.

Category: Radwaste Facility France »