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INES N/A INES 0 INES 1 INES 2 INES 3 INES 4 INES 5 INES 6 INES 7 |
INES 3: Serious incident
Impact on People and Environment:- Exposure in excess of ten times the statutory annual limit for workers.
- Non-lethal deterministic health effect (e.g., burns) from radiation.
- Exposure rates of more than 1 Sv/h in an operating area.
- Severe contamination in an area not expected by design, with a low probability of significant public exposure.
- Near accident at a nuclear power plant with no safety provisions remaining.
- Lost or stolen highly radioactive sealed source.
- Misdelivered highly radioactive sealed source without adequate procedures in place to handle it.
 INES 3 |
Accident in industrial radiography |
A radiographer was taking several radiographic films to a pipes by the night. In order to be sure that the guide tube was correctly the radiographer went to the tube guide an collimator to fix them. This operation was made by 40 times. Eventually the radiographer touched with his left hand, at least 10 times, the tube guide where the source was unnoticed. Also, two auxiliar staff went to the radiographer position carrying the films to be checked at least by 40 and 20 times. The radioactive source was 3199,5 GBq Ir-192. The event was detected at the end of job.
INES 3 |
Overexposure to a Radiographer Trainee's Extremities |
Preliminary information indicates that a radiographer trainee received an extremity exposure to the fingers, as result of removing a radiography camera guide tube with the source still in it and touching the source. The trainee's fingers indicate observable deterministic effects, which include blistering of the thumb, index and middle fingers. These types of effects correspond to an exposure range of 20 to 30 Sv (2000 to 3000 rem) to the extremities. The trainee is receiving medical care at an area hospital.
INES 3 |
Loss of the cooling function to the ultimate heat sink due to the big tsunami |
Fukushima Dai-ni Nuclear Power Station Units 1, 2 and 4, which is in rated power operation, have automatically shut down around 14:46(JST) on March 11, 2011, because of the Tohoku regional Pacific Ocean Offshore Earthquake. Following the earthquake, the big tsunami attacked the power station and the seawater pump rooms were flooded. The licensee lost the function operability of sea water pumps for last heat removal. The turbine driven pump started operation and the exhausted steam increased the pressure of the suppression pool.
INES 3 |
Loss of the cooling function to the ultimate heat sink due to the big tsunami |
Fukushima Dai-ni Nuclear Power Station Units 1, 2 and 4, which is in rated power operation, have automatically shut down around 14:46(JST) on March 11, 2011, because of the Tohoku regional Pacific Ocean Offshore Earthquake. Following the earthquake, the big tsunami attacked the power station and the seawater pump rooms were flooded. The licensee lost the function operability of sea water pumps for last heat removal. The turbine driven pump started operation and the exhausted steam increased the pressure of the suppression pool.
INES 3 |
Loss of the cooling function to the ultimate heat sink due to the big tsunami |
Fukushima Dai-ni Nuclear Power Station Units 1, 2 and 4, which is in rated power operation, have automatically shut down around 14:46(JST) on March 11, 2011, because of the Tohoku regional Pacific Ocean Offshore Earthquake. Following the earthquake, the big tsunami attacked the power station and the seawater pump rooms were flooded. The licensee lost the function operability of sea water pumps for last heat removal. The turbine driven pump started operation and the exhausted steam increased the pressure of the suppression pool.
INES 3 |
Loss of cooling function and water supplying function on the spent fuel pool due to the big tsunami. |
Fukushima Dai-ichi Nuclear Power Station Unit 4, which was in shutdown mode, was attacked by the Tohoku regional Pacific Ocean Offshore Earthquake around 14:46 (JST) in March 11, 2011.
After that, the power station was attacked by a tsunami.
Electricity rooms and seawater pump rooms were flooded, and the cooling function and water supplying function on the spent fuel pool became inoperable.
INES 3 |
Effect to the Nuclear Facilities from the earthquake on east area of Japan |
14:46 (UTC 5:46) March 11, an earthquake hit east area of Japan. Summary of earthquake and current status of each nuclear facility is as follows;
1. Summary of Earthquake
(1) Time of Occurrence: 14:46 (UTC 5:46) March 11, 2011, Friday
(2) Epicenter: Off-Coast of Sanriku (North Latitude: 38; East Longitude: 142.9), 10km deep, M8.8
2. The status of operation at Power Stations(Number of automatic shutdown(units): 10 (as of 00:30(UTC:11:46), March12)
a.
INES 3 |
Overexposure of a field radiography worker |
A field of radiography worker took overexposure incidentally with radiography equipment containing 2.1TBq (55.8Ci) Ir-192 source at the pipe welding workshop located in Jinju southern part of Korean Peninsula, on March 3, 2009.
The incident caused from the wrong direction of crank handle by radiographer’s confusion. The investigation unfolded that any survey meter was not deployed to working place and the worker did not wear a personal dosimeter as well as an alarm meter.
INES 3 |
Overexposure in the field radiography |
The incident has happened during radiography work with Gammamat model TSI-3, containing Ir-192 source with activity at the time 2.6 TBq (70.2 Ci). The technician operating remote crank mechanism was not able to crank in the source to the shielded position. He asked for help company’s radiation protection inspector (RPI). The RPI with the second worker came in the hurry, forgetting to take their individual dosemeters.
INES 3 |
Overexposure of a worker |
On September 25 th the CSN was informed through the Radiopathology National Hospital that an industrial radiography operator suffered from radiological skin injuries, on the fingertips of three fingers on his right hand. The operator complained of tightness in his fingers 24 hours and developed a blister and erythema 48 hours later of an incident involving an event with an remote portable industrial gammagraphy device with 0,8 TBq (21,4 Ci ) of Iridium-192 .
