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

Radiation Exposure of workers to tritium

On June 23, 2012, Rajasthan-5 was under planned biennial shutdown. Work was in progress to weld a piping connection for making alternate provision for water addition to the moderator system. During the work, tritium concentration in the work area increased when an opening was made in the moderator cover gas line. Two of the contract workers involved in the job got internal exposure of tritium equivalent to radiation dose of 24.32 mSv and 16.54 mSv.

Category: Power Reactor India »

INES-event
INES 1

Fire and abnormal primary circuit leak occured at Penly NPP n°2 reactor

On 5 April 2012, at around 12 midday local time, ASN was informed by the operator EDF that a fire had started in the n°2 reactor building of the Penly NPP (North-West of France). The reactor automatically shut down.

EDF teams and the local firemen brigades entered the reactor building and extinguished burning oil. The firemen ensured the fire was totally extinguished.

Category: Power Reactor France »

INES-event
INES 1

Am-241 source melting

An orphan Am-241 source inadvertently included in scrap metal was melted on the //23/2/2012 // in a Finnish steel factory in Tornio. The first alarm of abnormal radiation level was given by detectors screening the slag pots. The activity of melted source can not be determined exactly, but it is estimated to fall in to Category 4 (0,6 – 60 GBq). The source is traced by the operator to stainless steel scrap delivered from Central Europe.

Due to its physical properties most of the Am-241 activity is partitioned in to the slag phase (aprox 99%) and dust phase (1%).

Category: Radiation Source Finland »

INES-event
INES 1

Start of a fire in decontamination machine of former nuclear manufacturing plant of Bosco Marengo (AL) under decommissioning

On December 22nd 2011 Sogin S.p.A, which operates the former plant Fabbricazioni Nucleari of Bosco Marengo (AL) currently under decommissioning, communicated to ISPRA (Institute for Environmental Protection and Research)-which perform the functions of Nuclear Safety Authority- an anomalous event related to the decontamination machine by \shot blasting\ located inside the plant occurred at 9:25 am local time.

Category: Other Italy »

INES-event
INES 1

Hazardous manipulation of a lightning rod with Ra-226

On April 7 ITN ( the Nuclear and Technological Institute), the institution responsible for the interim storage of radioactive waste in Portugal, was contacted by a private company that requested instructions on how to dismantle, handle and transport a radioactive lightning rod (containing a category 5 radioactive source). Detailed instructions were provided by ITN to the company.

On October 4, the lightning rod was finally delivered at ITN.

Category: Radiation Source Portugal »

INES-event
INES 1

Found radioactive source

On 28 Sep 2011 evening, a citizen equipped by the chance with a special watches with dosemeter, informed the Police of the Czech Republic that there was an increased radiation on a children playground in Prague 4. By activating the integrated emergency services the police and fire brigade arrived to the location. The increased radiation was confirmed, State Office for Nuclear Safety (SONS) dispatched a mobile group of National Radiation Protection Institute, which measures the radiation and identified the source. The amounts of dose were approx.

Category: Radiation Source Czech Republic »

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 »