2

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

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.
Javascript is required to view this map.
INES-event
INES 2

Overexposure of a member of the public

An industrial radiograph test was performed in Sakarya province, Turkey on October 17,2016 after which a serious radiological incident occured.
Test was performed in a normal manner but after the test, the radiological protection officer hurried up and skipped the control that the source was secured. The source, Ir-192 with a 15 Ci activity (category 3 source according to INES manual) at the date of the accident, dropped to the worksite as unsealed. The source was found by a 16 years old visitor (E.B) approximately at 03:40 p.m. (local time) next day. E. B. placed the source to his trouser’s back pocket and travelled to home for two and a half hours. At the house, household members and their guests declared that they touched or saw the source until approximately 09:00 a.m. on October 20, 2016.
The source was reported as lost to Turkish Atomic Energy Authority Disaster and Emergency Management Center by its owner on October 20, 2016.

Category: Radiation Source Turkey »

INES-event
INES 2

Overexposure to Radiographer

The licensee radiographer's dosimetry report for July 2016 recorded a dose of 0.055 Sv (5.5 rem), bringing his total dose to 0.064 Sv (6.4 rem), which is above the statutory limit of 0.05 Sv annually (5 rem) for a radiation worker. The Radiation Safety Officer believes the radiographer may not have been properly distancing himself from the source while performing radiography in an enclosed area. NRC EN52199

Category: Radiation Source United States of America »

INES-event
INES 2

Excessive Deposits of Material Containing Uranium In Scrubber

At a facility authorized to use low-enriched uranium to fabricate commercial nuclear fuel assemblies, excessive deposits of uranium-bearing material were found in the main scrubber and associated ventilation ductwork. The function of the scrubber is to remove gases and particulates from various process exhaust streams. During the most recent planned annual wet scrubber system cleanout, personnel noticed an abnormal amount of material buildup in the inlet transition region and associated ductwork (i.e. elbow). Over the course of the 2-day maintenance evolution approximately 197 kilograms of material were removed from these two sections. These sections are not a favorable geometry from a criticality perspective. Since the facility personnel were under the assumption that this material had a low uranium concentration, operators attempted to break up and wash away the material to facilitate its removal. The facility personnel did not sample the material to confirm the uranium concentration before conducting these activities. After the material was removed, grab samples of the material were taken and analyzed for uranium concentration. The grab sample results indicated that the uranium concentrations ranged from 34wt% – 55wt%, which corresponded to approximately 87 kilograms of uranium. As such, the criticality safety evaluation mass limit of 29 kilograms was exceeded by a factor of 3.

Category: Fuel Fabrication United States of America »

INES-event
INES 2

Overexposure to Radiographer

During the performance of industrial radiography, the licensee radiographer taped the radiography camera’s guide tube to a jig in preparation for an exposure shot. During the exposure shot, the guide tube fell and the radiographer re-taped it to the jig without first retracting the source back inside the camera. A re-enactment of the event demonstrated that the radiographer had placed his left hand on the camera's collimator and inserted his middle finger into its port hole.

Category: Radiation Source United States of America »

INES-event
INES 2

Worker Overexposure

During an inspection in January 2016, the State of Florida noted that one of the licensee's employees working with a particle accelerator had exceeded the 50 mSv (5 rem) worker exposure limit for 2015 (overexposure nominally was 52 mSv (5.2 rem)). This employee also had nine high exposure investigative reports for 2015, and the Radiation Safety Officer had failed to take any action to mitigate exposure. Florida plans to conduct a follow up inspection to investigate the circumstances surrounding the worker overexposure. NRC EN51688

Category: Irradiation/Accelerators Facility United States of America »

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 »