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INES Levels
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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

Personal Contamination at Reprocessing Plant

Sampling of radioactive material was taking place on a reprocessing facility. This sampling task is performed twice daily and experienced senior staff are used to perform the operation. On this occasion a Shift Team Leader was engaged to undertake the task. Upon leaving the building and using the building exit hand and frisking monitors, the Shift Team Leader found himself to be contaminated. The Shift Team Leader reported to the Health Physics Surgery where contamination was found on one finger of his right hand and removed using the standard procedure.

Category: Fuel Reprocessing Sellafield United Kingdom »

INES-event
INES 2

Electronic Personal Dosimeter went into Alarm during X-ray Radiography Operations

Radiographers were working in a cell in a redundant reprocessing facility, carrying out digital imaging of legacy crates using X-rays in order to identify their contents.
This cell is an area of known high background radiation containing ten legacy crates.
A previous health physics survey of the crates had identified radiation levels in nine of the crates between 0.5 mSv/h and 1.8 mSv/h gamma, with the other crate up to 20mSv/h gamma.

Category: Fuel Reprocessing Sellafield United Kingdom »

INES-event
INES 2

Transport of package containing a radioactive source from Kenya to South Africa

A parcel containing an industrial radiography sealed source was transported from Kenya to South Africa. The package was labelled as empty (UN2908) and was handled as a general luggage during transportation in a South African Airways passenger flight. On arrival at the final destination the dose rate on the outside surface of the package was measured by the consignee to be 6mSv per hour. The measured dose rate on the surface of the package could potentially result in the low to moderate health risk to people who were in contact with the package.

Category: Transportation Kenya South Africa »

INES-event
INES 2

Inadvertent damage of a Se-75 source

On December the 12th, 2016, a Se-75 source was inadvertently damaged during re-pair work on faulty radiography equipment. The work was performed in Düsseldorf region in North Rhine-Westphalia by a specialized company within a controlled area. The source contained about 1.3 Terabecquerel Se-75. The radioactive substance was released during the repair work and contaminated persons and zones within and out-side of the controlled area. Besides the two workers performing the repair work, other persons were also contaminated.

Category: Radiation Source Germany »

INES-event
INES 2

Cyclotron operated with an open bunker door

On the 12th of October 2016 the Swedish Radiation Safety Authority was informed about an event that occurred on the 7th of October where a cyclotron was operated with an open bunker door. The licensee is authorised to produce short lived isotopes used for medical
diagnostics. The bunker is supposed to be sealed with interlocks preventing operation of the cyclotron with an open door. At the time of the event a study visit was performed at the facility by hospital personnel from the whole of Sweden lead by a representative from

Category: Radioisotope Processing/Handling Facility Sweden »

INES-event
INES 2

Overdose to Nuclear Pharmacist

The licensee (PETNET Solutions) has confirmed an extremity dose of greater than 0.5 Sv (50 rem) to one of its nuclear pharmacists. Dosimetry results for a ring badge worn on the pharmacist’s right ring finger accumulated a total dose of 0.511 Sv (51.1 rem) for the year as of October 19, 2016. The pharmacist received the dose while working at the licensee's locations in Phoenix, Arizona, and Portland, Oregon. The pharmacist has been placed on work restrictions. The licensee expects to complete a root cause analysis within 2 weeks. NRC EN52350

Category: Radioisotope Processing/Handling Facility United States of America »

INES-event
INES 2

Overdose to Nuclear Pharmacist

The licensee (PETNET Solutions) has confirmed an extremity dose of greater than 0.5 Sv (50 rem) to one of its nuclear pharmacists. Dosimetry results for a ring badge worn on the pharmacist’s right ring finger accumulated a total dose of 0.511 Sv (51.1 rem) for the year as of October 19, 2016. The pharmacist received the dose while working at the licensee's locations in Phoenix, Arizona, and Portland, Oregon. The pharmacist has been placed on work restrictions. The licensee expects to complete a root cause analysis within 2 weeks. NRC EN52350

Category: Radioisotope Processing/Handling Facility United States of America »

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 »