2

INES Levels
INES N/A
INES 0
INES 1
INES 2
INES 3
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INES 2: Incident

Impact on People and Environment:
  • Exposure of a member of the public in excess of 10 mSv.
  • Exposure of a worker in excess of the statutory annual limits.
Impact on Radiological Barriers and Control:
  • Radiation levels in an operating area of more than 50 mSv/h.
  • Significant contamination within the facility into an area not expected by design.
Impact on Defence-in-Depth:
  • Significant failures in safety ­provisions but with no actual ­consequences.
  • Found highly radioactive sealed orphan source, device or transport package with safety provisions intact.
  • Inadequate packaging of a highly radioactive sealed source.
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INES-event
INES 2

Realizing of maintenance activities without respecting the procedures

During maintenance activities that were conducted on some systems of one of the two irradiators present in the Sterigenic's installations, it was found that some safety-related equipment was unavailable. However, the availability of this equipment is requested as described in the procedure currently in application.

As this equipment was unavailable, Sterigenic's operators carried out those maintenance operations with only one safety device ensuring protection from a potential irradiation by the 60-Co sources that are used in the installations.

Category: Irradiation/Accelerators Facility Belgium »

INES-event
INES 2

Overexposure to workers to radiografic source

Three workers were exposed to doses while working in a bunker. One worker was shielded, two were not.
The source is Se-75 1,5 TBq
Two workers were exposed to approx. 30 mSv, well above the annual limit of 20 mSv
The shielded workers dose was approx. 0.6 mSv.

None of the workers had dosimeters.

Category: Radiation Source Norway »

INES-event
INES 2

Overexposure of radiographyworker over the annual limit

Worker, wearing warning device (not dosimeter) was in a bunker with an unsecured source (Ir-192 - 555 GBq).

Dose received approx. 32 mSv.

Category: Radiation Source Norway »

INES-event
INES 2

Overexposure to Member of the Public

The patient received 555 MBq (15 mCi) of I-131 for therapy conducted from March 22, 2013, through March 29, 2013. During the patient’s hospitalization, visitors, including family members, were provided with radiation badges to monitor exposure. The badges were processed by Landauer on May 5, 2013, and the results of the badge reading indicate that a family member appears to have received 59 mSv (5.9 rem) effective dose equivalent during the period of the patient’s hospitalization.

Category: Other United States of America »

INES-event
INES 2

Overexposure to Radiographer

Two radiography trainees were performing industrial radiography inside a tank. The first trainee handled the guide tube of a radiography camera while the Ir-192 source was in the guide tube. The Ir-192 source contained 2553 GBq (69 curies).The first trainee was not wearing his personnel monitoring devices because he had left them in the truck. He also was not using a survey meter.

Category: Radiation Source United States of America »

INES-event
INES 2

Irradiation of a worker during an intervention using gamma ray projector

During a weld inspection operation carried out by two employees of the Welding Institute on a worksite in Pau using gamma radiography equipment , the radioactive source of the gamma ray projector jammed inside its guide tube.

Using a metal rod found on site, one of the operators managed to free the jammed source and return it to the safe position in the body of the device. During this operation, the operator was directly exposed to the radiation emitted by the radioactive source.

Category: Irradiation/Accelerators Facility France »

INES-event
INES 2

Exposure of a worker during radiographic inspections

On 18th April 2014, ASN was informed by the DCNS of an incident which occurred during the night of 17th to 18th April 2014 during radiographic inspections on the Nantes – Indret à La Montagne site. A team, consisting of an operator from the OTECMI company’s Plabennec office and an operator from the SGS Qualitest Industrie company’s Harfleur office, was carrying out radiographic inspections using a gamma ray projector containing a sealed radioactive source of iridium 192 with an activity of 1.95 TBq (terabecquerels) in one of the workshops on the DCNS site.

Category: Radiation Source France »

INES-event
INES 2

Deficiency in the determination of the uranium content of liquid waste tanks

On 26 October 2013 NRG reports that the of concentration Uranium-235 in one of the liquid waste tanks in the Molybdenum Production Facility (MPF) appears to be higher than allowed according to the license. Therefore, a criticality incident could not be excluded. The MPF has twelve storage tanks for liquid uranium-containing waste: six for highly radioactive waste and six for waste with a lower activity. The waste is temporarily stored in the tanks awaiting transport to the Dutch processor of radioactive waste, COVRA.

Category: Radioisotope Processing/Handling Facility Netherlands Dutch NRG »

INES-event
INES 2

Common cause mechanical deficiency in control rods

During an outage, on 26 September 2013, NRG reports the discovery of a deficiency in one of the six control rods of the High Flux Reactor (HFR) during an outage. Based on this discovery NRG decided to delay the restart of the reactor until the root cause and necessary measures were established and carried out. During the investigation two more control rods were found to show comparable deficiencies. The deficiencies could be traced back to an unreliable joining method of two main parts of the control rods.

Category: Research Reactor Netherlands Dutch NRG »

INES-event
INES 2

Deficiency in the determination of the uranium content of liquid waste tanks

On 17 October 2013 NRG reports that the of concentration Uranium-235 in one of the liquid waste tanks in the Molybdenum Production Facility (MPF) appears to be higher than allowed according to the license. Therefore, a criticality incident could not be excluded. The MPF has twelve storage tanks for liquid uranium-containing waste: six for highly radioactive waste and six for waste with a lower activity. The waste is temporarily stored in the tanks awaiting transport to the Dutch processor of radioactive waste, COVRA.

Category: Radioisotope Processing/Handling Facility Netherlands »