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

Missing Radioactive Gauge

On January 6, 2004, Louisiana Radiation Protection Services notified the Nuclear Regulatory Commission that a licensee’s radioactive device could not be located. The device is a Kay-Ray Model 7063P gauge, with serial number 12349, currently containing a 11.71 Gbq (316.4 milliCurie) source of Cs-137. Since 1984, the device has been stored in a secured wooden crate with proper labeling, inside a locked warehouse with limited access at the licensee’s facility. The device was last accounted for during an inventory conducted on September 4, 2003.

Category: Radiation Source United States of America »

INES-event
INES 1

I-192 sealed source stolen

A GammaMat TSI 3/I equipment - matr. 156, containing a 1.92 TBq Iridium 192 source, was stolen in South Italy on November 25th 2005, together with the lorry used for its transportation. The equipment, used for non destructive tests, was in secured position at the time it was stolen. The event was notified to the National Safety Authority by the competent police department, according to the applicable procedure.

Category: Radiation Source Italy »

INES-event
INES 1

Lost Radiographic Exposure Device

On May 29, 2005, a licensee notified the Nuclear Regulatory Commission (NRC) that one of their radiographic devices containing a sealed source of approximately 1.63 terabecquerels (44 Ci) of iridium-192 fell into the ocean. The event occurred during a transfer of the device from an offshore oil rig to a boat. The licensee stated that they intended to send a team of divers to try and retrieve the device.

Category: Radiation Source United States of America »

INES-event
INES 1

Sealed sources stolen from an industrial non destructive test company

On March 1th 2004, four devices used for industrial gammagraphy and an X-ray apparatus were stolen from premises of an industrial non destructive test company near Taranto, in South Italy.
As referred by the company responsible, the devices are all equipped with Ir-192 sealed radiation sources, with the following identification number, type and activity respectively:
Matr. 1727, GAMMAMAT TI/F, 207.2 GBq;
Matr. 1117, GAMMAMAT TI/F, 124.69 GBq;
Matr. 1228, GAMMAMAT TI/F, 1055.56 GBq;
Matr. 130, GAMMAMAT TSI/F, 467.62GBq.

Category: Radiation Source Italy »

INES-event
INES 1

Radioactive orphan source of Eu-152,154

Based on the information from the Republic of Slovenia, the orphan source of Eu-152,154 was discovered on November 29, 2004 in the truck transporting scrap lead. Measured dose rate on the surface of the truck was 130 microSv/h. Source was isolated and safely stored.
After the examination, it was concluded that this source was part of lightning preventer, which was installed in the industrial zone near Osijek, Croatia. The activity of the source in 1986 was 11.1 GBq.

Category: Radiation Source Croatia »

INES-event
INES 1

Loss of an excepted package shipped to Slovakia

End October 2004 the French authorities were notified that the package had arrived on September, 22 to Warsaw airport (Poland) due to an error in the transfer in Praha airport. The package was due to return to France as soon as possible, after having received the appropriate transport authorisation.

Category: Transportation France »

INES-event
INES 1

Unplanned exposure of workers

On 21 October , 2004 Radiation and Nuclear Safety Authority (STUK) received information that an event occurred on 20 October, 2004, resulting in unplanned exposure of two radiographers. The elevated doses, 11 mSv and 18 mSv, were caused by the failure to retract a source to its locked position after exposure. The radiographers had personal alarming rate meters, but because of using hearing protectors in noisy environment they were not able to hear the alarming sound until they had removed the device 20 meters to next workplace.

Category: Radiation Source Finland »

INES-event
INES 1

Loss of an excepted package between Saclay (France) and La Habana (Cuba)

On July 17, an excepted package containing radioactive material has been lost during its transport between Saclay (France) and the consignee located in La Habana (Cuba).The French authority was informed on July 30 of this event. Due to the estival period, the loss discovering has taken more time than in normal period. This package consigned by CIS bio international (France) contains a limited quantity of Iodine 125 (a total of 1.43 MBq). The competent authority of France informed the competent authority of Cuba.

Category: Transportation France »

INES-event
INES 1

Violation of heat-up rate during restart of reactor

From 28 to 29 May 2004 a scheduled plant shutdown for repairing a primary leakage (gland of a control valve ) inside the containment was carried out. In the course of the restart on 28 May (criticality at 22 h 48), at about 50°C, the reactor was made critically for warming-up. During that process, which is closely monitored by the operator to switch over timely the neutron flux monitor ranges (eight decades) to prevent a Scram, he did not fully recognize the positive temperature coefficient of the fuel near to the end of the cycle (power increased to approx.

Category: Power Reactor Leibstad Switzerland »

INES-event
INES 1

Violation of Containment ventilation operation mode

From 28 to 29 May 2004 a scheduled plant shutdown for repairing a primary leakage (gland of a control valve ) inside the containment was carried out. During preparation of the restart on 28. Mai (control room check at 19.00 hours) the operators failed to recognise that containment ventilation was in a condition not allowed for plant start-up (as required by Technical Specification). The check was done in the control room by checking the indicator lights: large purge (light was on), small purge (light was off), this was errorneous interpreted. In effect, only the “small purge” was allowed.

Category: Power Reactor Leibstad Switzerland »