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

Worker Overexposure

A Nuclear Medicine technologist received an overexposure to the extremity dosimeter for March 2011. The extremity dose was reported as 564.4 mSv (56.44 rem). During the month of March, the technologist performed several cell-labeling procedures involving 2,775 MBq, 4,107MBq, and 3,996 MBq (75mCi, 111mCi, and 108mCi respectively) amounts of Y-90. There were also several labeling procedures involving the use of I-131 during the same time frame.

Category: Other United States of America »

INES-event
INES 2

Over exposure of workers beyond annual regulatory limit

Kakrapar Atomic Power Station (KAPS) is a twin unit station with 220 MWe Pressurized Heavy Water Reactors. Refueling of these reactors is done when the reactor is on-power. The spent fuel bundles discharged from the reactor are transferred to Spent Fuel Storage Bay (SFSB) through the Spent Fuel Transfer Duct (SFTD). The radiation field in the SFTD area goes high during transfer of spent fuel bundles through SFTD.

On May 30, 2011, Unit-2 of KAPS was operating at 98% FP. For carrying out painting job, SFTD shielding blocks were removed.

Category: Power Reactor India »

INES-event
INES 2

Inadequate setting of the auxiliary feedwater turbopump

After the replacement of an auxiliary feedwater turbopump during the 2009-outage, the rotational speed of the pump was adjusted to a lower level because of vibration problems with the pump. The pump was tested and requalified according to the technical specifications but the curve (flow-rate <-> pressure) was not verified as required by ASME-XI. The actual flow rate delivered in case of specific accidents could no longer match the flow rate postulated in the safety report. Nevertheless, an independent emergency feedwater system could offer additional capacity in such circumstances.

Category: Power Reactor Belgium »

INES-event
INES 2

OVEREXPOSURE TO RADIATION WORKER

On January 13, 2011, the licensee received a dosimetry report which stated that one of their employees received a year-to-date exposure of 55 mSv (5.5 rem) which was above the statutory limit of 50 mSv (5 rem). The overexposure was received in December 2010 during the emergency repair of a cyclotron unit over a period of several days. However, the affected employee’s real-time dosimeter indicated a much lesser exposure, calling into question the measurement indicated on the permanent dosimeter.

Category: Other United States of America »

INES-event
INES 2

Level 2 incident on INES scale concerning back-up diesel generators at Tricastin nuclear power plant

ASN has rated at level 2 on INES scale an incident reported by EDF licensee on February 16, 2011 concerning back-up diesel generators at Tricastin NPP.

Category: Power Reactor France Tricastin »

INES-event
INES 2

Reactor trip due to high pressure in the reactor pressure vessel

On January 19, 2011 the Laguna Verde NPP Unit 2 was operating at 43.2% of rated power in process for testing. According to the sequence of events, it follows that: While testing for the load rejection signal, the main turbine incremented its speed. The main turbine control valves started to close while controlling the turbine speed. The pressure at the first step in the turbine was at 17 kg/cm2, with the control valves closed. Then, the pressure at the first step started to decrease until 4.6 kg/cm2.

Category: Power Reactor Mexico »

INES-event
INES 2

Overexposure of field radiography workers

On November 4, 2008, two field radiography workers took overexposure incidentally with radiography equipment containing 1.8Tbq (47.7Ci) Ir-192 sources at pipe welding workshop located in Yeosu province southern part of Korean Peninsula.

The incident caused from returning the disconnected pig-tail source to the source container by those of two workers without any preventive or protective measures. The investigation unfolded that any survey meter was not deployed to working place and an alarm meter worn by one of worker was not properly working.

Category: Radiation Source »

INES-event
INES 2

Several mine workers overexposed by X-rays

Personnel at Boliden Mineral have been exposed to X-rays. Personnel from the Swedish Radiation Safety Authority were on site at the mine in Gällivare to investigate the event that is now being analysed. The Authority has made a provisional INES classification of the event as INES Level 2. This is based on the current knowledge of doses to the exposed personnel.

Category: Mining/Milling Sweden »

INES-event
INES 2

Inadvertent Containment Spray of Reactor Coolant

On 17 September 2010, during the reactor coolant system (RCS) heat-up in hot shutdown condition under commissioning test, the containment spray isolation valve was opened inadvertently. The opened valve formed the flow path through the shutdown cooling system (SCS) from the RCS to the containment spray nozzles.

Category: Power Reactor South Korea »

INES-event
INES 2

Radiography overexposure

On September 16, 2010 the radiation safety officer of a licensed industrial radiography company notified the Regulatory Authority of an overexposure of a gammaradiography worker. The worker was exposed by a 0.4 TBq (11 Ci) cobalt-60 source, with the dose exceeding the annual dose limit 50 mSv for radiation workers. The incident occurred when the radiographer entered the bunker without retracting radiation source to its shielded position. The worker spent about 4 minutes in the bunker while replacing the radiography film.

Category: Radiation Source Finland »