1

INES Levels
INES N/A 
INES 4
INES 0
INES 5
INES 1
INES 6
INES 2
INES 7
INES 3

INES 1: Anomaly

Impact on Defence-in-Depth
  • Overexposure of a member of the public in excess of statutory ­annual limits.
  • Minor problems with safety components with significant defence-in-depth remaining.
  • Low activity lost or stolen radioactive source, device or transport package.
(Arrangements for reporting minor events to the public differ from country to country. Also, it is difficult to ensure precise consistency in rating events between INES Level-1 and Below scale/Level-0)
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INES-event
INES 1

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 »

INES-event
INES 1

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 »

INES-event
INES 1

Melting of Orphan Source

Tuesday 13 September 2011 in the evening, the FANC was informed that a radiation portal monitor for the measurement of radioactivity in a French facility indicated the presence of radioactive material in the load of a truck coming fom Duferco La Louvière Produits Longs, located in La Louvière, Belgium.

Category: Radiation Source Belgium »

INES-event
INES 1

Potential damage in riser pipe at Laguna Verde NPP U2

On October 22, 2010, Laguna Verde NPP Unit 2 personnel found during the outage inspection that the riser pipe of two jet pumps of the recirculation system were affected with a small crack. The root cause of this event is still in investigation. Corrective actions are still in planning and the refueling activities are in hold.

Category: Power Reactor Mexico »

INES-event
INES 1

Non Usual Event declared due to loss of outside power at Laguna Verde NPP U1

On December 02, 2010, Laguna Verde NPP Unit 1 was operating at 87.5 % rated power, when a loss of outside power event ocurred, and a Non Usual Event was declared by the operator. All safety systems worked as required, including all three diesel generators; and the reactor was taken to a safe shutdown condition.

Category: Power Reactor Mexico »

INES-event
INES 1

Lost or stolen sources containing Co-60

During regulatory control carried out on in decommissioned old foundry facility located in LUBLIN (city located near the eastern border of Poland) regulatory inspectors of NAEA discovered lack of 7 lead containers (Type: PrJ20) with Co-60 (non-dangerous source, category 5). The lost or stolen sources contain Co-60 with following activity, on December 7 current year, as follow:
1. 9 MBq
2. 20 MBq
3. 20 MBq
4. 20 MBq
5. 13 MBq
6. 17 MBq
7. 17 MBq
The investigation is being conducted.

Category: Other Poland »

INES-event
INES 1

Radiation Worker Skin Overexposure

On August 28, 2008, a production operator in the UltraTechnekow (UTK) lab at the Petten (the Netherlands) radiopharmaceutical production facility was contaminated with molybdenum-99 (Mo-99) on the skin of both hands, most significantly the right thumb. The contamination was discovered approximately 1.5 hours after shift started when employees monitor themselves for contamination before leaving the radiological zone for their regular scheduled break. Immediate decontamination and radiological surveys of the production area were initiated.

Category: Other Netherlands NRG »

INES-event
INES 1

Incident involving radioactive material at IAEA safeguards laboratory

Pressure build-up in a small sealed sample bottle in a storage safe resulted in plutonium contamination of a storage room at about 02:30h on 3 August 2008 at the IAEA's Safeguards Analytical Laboratory in Seibersdorf.
All indications are that there was no release of radioactivity to the environment. Further monitoring around the laboratory will be undertaken. No one was working in the laboratory at the time.

Category: Other Austria »

INES-event
INES 1

Spillage of uranium-bearing effluents into the environment at the SOCATRI nuclear facility

During the night of July 7 to 8 2008, an incident occurred at the site of the SOCATRI company. A tank of the Uranium-bearing Effluent Treatment Station (STEU) of the SOCATRI facility overflowed in its retention tank. This retention tank was not leakproof at that time and caused a pollution of the environment.

On July 10 2008, four ASN inspectors, accompanied by two IRSN experts, carried out an in-depth inspection of the STEU facility. They examined the premises, the events chronology and the first corrective actions implemented by the licensee.

Category: Other France Tricastin »

INES-event
INES 1

Deterioration of the containment depression of unit 1 during an air locking operation for maintenance activities

During the morning shift on 07/07/2008, two workers, involved in the maintenance of safety valves, were instructed to repair a leakage at a safety valve in the cooling water system of the recirculation fans used for cooling the containment air space of Unit 1. The entry to the room is possible through an air-lock. The air-locking operations were carried out by the two workers, having entrance permit to the area, by disregarding the relevant regulations.

Category: Power Reactor Hungary Paks »