Fuel Reprocessing

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Spillage of active liquor

Unusual levels of radioactivity were detected at a storm water collection tank serving a number of Active Plants. The radioactivity was traced to a spillage of active liquor arising from active liquor transfers. Heavy rain had washed the active liquor spillage into the storm water drain and contaminated roadway, gutters and building environments. About 5 GBq beta and 100 MBq alpha was found on the ground, etc.
Personnel contamination and radiation exposure was not significant.
Discharges to the environment were well within the authorised limits.

Category: Fuel Reprocessing Sellafield United Kingdom »

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Release of airborne activity into the workplace resulted in a building evacuation

A release of airborne activity during work on the charge machine resulted in airborne activity monitor alarms which automatically triggered a building evacuation. There was no activity discharge to the external environment. Personnel involved have been decontaminated. An estimate of the quantity of activity released into the air in the immediate vicinity of the event is a few tens of gigabequerels of I-131 equivalent.

Category: Fuel Reprocessing Sellafield United Kingdom »

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CONFIRMED DOSE ABOVE STATUTORY DOSE LIMIT PROBABLY DUE TO A WOUND

Last year an event was reported in the Sellafield Newsletter, Thursday 14 September 1995 (no. 424), involving the exposure of a fuel plant's worker. Monitoring and extensive investigations have been carried out since and these have confirmed that he exceeded the dose limit for 1995.
Investigations have shown that no other worker in the same area at that time was affected. As part of our continuous safety improvement policy any implications will be fully taken into account. This event breached the regulatory dose limit and is therefore reportable to ministers.

Category: Fuel Reprocessing Sellafield United Kingdom »

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SKIN EXPOSURE IN EXCESS OF DOSE LIMIT

Following an entry to Pour Cell 2 Hoist Park, the PVC coverall of a filter was found to be contaminated with a localised spot of radioactivity on the right knee. Combining dosimetric measurements of dose rates with estimates of wearing times, result in an intital estimate up to about 2 Sv skin radiation exposure (of dose limit of 0.5 SV/y).

Category: Fuel Reprocessing Sellafield United Kingdom »

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DAMAGE TO A SPENT FUEL ASSEMBLY DURING PREPARATORY OPERATIONS FOR REPROCESSING

In the "hot room" of the spent fuel reprocessing plant a spent fuel assembly was being prepared for grinding and loading into the dissolver. During the chopping of the lower end plug an electric arc was formed at the place of installation of the "static" clamp of the fuel assembly jacket tube. Personnel stopped the chopping process and switched off the chopping machine.

Category: Fuel Reprocessing Mayak Russian Federation »

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OVEREXPOSURE OF OPERATORS WHILE CHARGING IRRADIATED FUEL BUNDLES INTO THE DISSOLVER

Spent fuel reprocessing campaign at Plutonium Plant was in progress on 18th March 1994. The charging cask with the fuel was mated to the dissolver port hole at the charging bay of the dissolver. The liner with the fuel was pushed in and the pushing of the fuel into the dissolver was started. But the fuel got stuck between the dissolver port and the liner. When the charging cask was withdrawn, the fuel was partly out of the cask. There was no damage to the cladding nor any release of radioactivity to the environment.

Category: Fuel Reprocessing India »

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RADIATION EXPOSURE OF WORKERS AT TOKAI REPROCESSING PLANT

Four workers were exposed internally while they were replacing a filter element of the vacuum filter installed in the sampling system connected to the plutonium receiving vessel of the rework process of the Tokai Reprocessing Plant on December 27, 1993. At the time of incident, operation of the Tokai Reprocessing Plant was stopped for routine maintenance from December 5, 1993. The cause of the internal exposure was that the four workers inhaled plutonium particles dispersed from the filter element in the vacuum distribution room.

Category: Fuel Reprocessing Japan »

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ACID SPILLAGE IN THORP

A minor seepage of uranyl nitrate liquor from the containment surrounding a pump has occurred in the chemical separation area of the Thermal Oxide Reprocessing Plant (THORP) at Sellafield. The volume was approximately one litre, covering an area of about 30 cm squared. No person has been sujected to any radiological hazard from the seepage and there was no relase of radioactive material to the environmet. Air smaplers confirmed that there was no abnormal airborne radioactivity resulting from the seepage.

Category: Fuel Reprocessing Sellafield United Kingdom »

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OVEREREXPOSURE OF A RADIOGRAPHY INSPECTOR AS A RESULT OF A WOUND

A special programme of urine sampling on a radiography inspector has confirmed a committed dose equivalent to bone surfaces of 628 mSv and a committed effective dose equivalent of 32.4 mSv following a puncture wound to his right elbow sustained during an inspection of a weld in a plutonium facility. The inspector had to lie on the floor to gain access to the weld and in so doing felt a sharp prick in his elbow. The wound was excised and about 1500 Bq of plutonium was removed from the wound site.

Category: Fuel Reprocessing Sellafield United Kingdom »

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INTAKE OF RADIOACTIVE MATERIAL BY OPERATORS AT DOUNREAY

Operations were being carried out in the residue recovery plant of the Prototype Fast Reactor Reprocessing Plant at Dounreay on the evening of 29 June 1993. Following the opening of a drum which contained centrifuge filter there was a small release of radioactive material, which was fully contained within the plant and easily cleaned up. The inital indications were that no significant doses had been received by workers.

Category: Fuel Reprocessing Dounreay United Kingdom »