2

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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

Overexposure to Radiographer

After performing a radiograph, the radiographer believed he had cranked the source back inside the camera. However, when he went to retrieve the film, he noticed that his survey meter was reading off-scale, and then he noticed that his pocket dosimeter also read off-scale. The radiographer’s whole body dosimetry was sent for processing, which resulted in readings of 114.5 mSv (11.45 rem) deep dose equivalent and 114.9 mSv (11.49 rem) lens dose equivalent. The total effective dose equivalent accrued by the radiographer for the year was 125.8 mSv (12.58 rem).

Category: Radiation Source United States of America »

INES-event
INES 2

Bordeaux University: discovery of radioactive sources and incidental exposure of persons

Two radioactive sources were discovered by the Bordeaux University prevention service in a very cluttered and regularly frequented room during a housekeeping operation carried out at the end of June 2015.

As soon as they were discovered, the sources were transferred for safe storage in a room specially intended for that purpose within the university campus.

Category: Radiation Source France »

INES-event
INES 2

Irradiation of a worker during scheduled NNP outage at Le Blayais

On 21st August 2015, ASN was informed by EDF of the accidental exposure of a worker from an EDF contractor to a dose of ionising radiation exceeding the regulation limit.

On 18th August, during the check carried out prior to exiting the limited access area, contamination was detected on the worker’s chin. He had been carrying out maintenance work in preparation for the hydrotesting of an exchanger on the chemical and volume control system in the reactor 4 safeguard auxiliaries building in the Le Blayais NPP.

Category: Power Reactor France La Blayais »

INES-event
INES 2

Overexposure to Radiographer

The licensee reported that one of their radiographers received a deep dose equivalent of 55.63 mSv (5.563 rem) during 2009. The licensee stated that the exposure had accumulated over the year and was not the result of a one-time event. Additionally, the licensee stated that the exposure probably occurred while the radiographer was using high activity sources in confined spaces. The licensee believes that the shooting times were so short that the radiographer was not able to maximize distance during operations.

Category: Radiation Source United States of America »

INES-event
INES 2

Overexposure to Radiographer

The licensee reported that one of their radiographers received a deep dose equivalent of 55.63 mSv (5.563 rem) during 2009. The licensee stated that the exposure had accumulated over the year and was not the result of a one-time event. The licensee stated that the exposure probably occurred while the radiographer was using high activity sources in confined spaces. The licensee believes that the shooting times were so short that the radiographer was not able to not maximize distance during operations in order to sufficiently reduce dose.

Category: Radiation Source United States of America »

INES-event
INES 2

Overexposure to Nuclear Medicine Technologist

In February 2015, it was determined that a nuclear medicine technologist received a cumulative annual whole body dose of 110 mSv (11 rem) for the time period of September 01, 2014 to January 07, 2015, which exceeds the annual statutory dose limit of 50 mSv (5 rem). The State completed their investigation and confirmed the validity of the whole body dose on July 13, 2015. The staff member received 100 mSv (10 rem) for 2014 and 10.1 mSv (1.01 rem) for 2015. NRC EN50877.

Category: Other United States of America »

INES-event
INES 2

Overexposure to Nuclear Medicine Technologist

In February 2015, it was determined that a nuclear medicine technologist received a cumulative annual whole body dose of 110 mSv (11 rem) for the time period of September 01, 2014 to January 07, 2015, which exceeds the annual statutory dose limit of 50 mSv (5 rem). The State completed their investigation and confirmed the validity of the whole body dose on July 13, 2015. The staff member received 100 mSv (10 rem) for 2014 and 10.1 mSv (1.01 rem) for 2015. NRC EN50877.

Category: Other United States of America »

INES-event
INES 2

Transport incident of a gamma ray projector

On 16th March 2015, ASN was informed by the ECW company (Courcelles-les-Lens) that one of their gamma ray projects had been carried on the public highway on 2nd March 2015 in conditions failing to comply with a number of requirements stipulated by the transport approval issued by ASN. Indeed, the device was not in the closed and locked position and was equipped with its site accessories, which prevented it from being fully inserted into its transport casing.

Category: Transportation France »

INES-event
INES 2

Overexposure to Radiographer

The Lead Radiographer and three assistant radiographers were completing two exposures lasting 35 seconds each. The set-up time for the exposures was approximately 15 to 18 minutes. After completing two exposures, one individual noticed that his pocket dosimeter read off scale, a second individual read their dosimetry at 0.5 mSv (50 mrem), the third individual read their pocket dosimeter as off scale, and the fourth individual was not wearing a dosimeter. Two individuals were wearing functioning rate meters and two were not.

Category: Radiation Source United States of America »

INES-event
INES 2

Uncontrolled release of radioactive effluents into the public sewerage system

On 2nd August 2013, ASN was informed by the Haut-Lévêque hospital in Pessac that an abnormal level of radioactivity had been discovered in a wastewater drain pipe. Investigations showed that radioactive effluents from the vectorised internal radiotherapy rooms were being discharged directly into the public sewerage network instead of being routed to the radioactive decay tanks, between August 2012 and 27th July 2013, owing to a piping connection error. The connection had been defective since works were carried out in August 2012.

Category: Other France »