Pakistan

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INES 1

Exposure to Worker in Excess of Administrative Limit

On May 04, 2014, C-1 was in shutdown state and maintenance activities were being performed during refueling outage. A worker belonging to Electrical Maintenance Division entered in restricted area of Reactor Building for a maintenance job on Containment Reactor Coolant Drain System (SRD) pumps. This area was already cordoned off and entry was restricted by Health Physics Division owing to the fact that dose rate was high due to placement of In-Core Neutron Flux Monitoring System Thimbles. The worker received a dose of 8.5 mSv which is above the administrative limit set by the plant i.e.

Category: Power Reactor Pakistan »

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Radiation Leakage from Brachytherapy Machine

The Brachytherapy machine became out of order in September 2009. The Bio-medical Engineering Department of the hospital explored to obtain maintenance support from the manufacturer for the repair of the machine but the same could not be arranged and machine remained out of use and was kept safe and secure in its bunker. In February 2014, during a routine check of the machine condition, the machine showed radiation leakage in the bunker room. It was suspected that the source pellet, while returning from the intermediate safe to the main safe mode, got stuck in the passage.

Category: Radiation Source Pakistan »

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INES 3

Overexposure of Workers

On October 18, 2012, three workers were overexposed during industrial radiography at Phool Nagar near Lahore. The event took place due to detachment of Ir-192 source (67 Ci) which remained stuck in the Guide Tube. The workers could not notice this and loaded the Gamma Projector and Guide Tube in the vehicle and traveled for almost 30 minutes from work site to office while placing the Guide Tube very close to the leg of one worker (‘worker A’ sitting on rear seat of the vehicle).

Category: Radiation Source Pakistan »

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Leakage of Heavy Water from Feeder Pipe

Plant was in shutdown state since October 05, 2011 because of maintenance activities. As per normal procedure during shutdown state, Standby Cooling System (SH) was in service to remove decay heat from the reactor core while Primary Heat Transport (PHT) system was in depressurized state. On October 19, 2011, inspection of channel S-11 grayloc seal was carried out to find out any foreign material in the orifice. During normalization of the system, Boiler Room (B/R) floor beetle alarm received in control room. Later, 'Tritium in Air High' alarm also annunciated.

Category: Power Reactor Pakistan »

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INES 0

Fire incident in boiler room

While monitoring boiler room through CCTV during plant start-up, flames were observed in the vicinity of one of the main coolant pumps. Reactor was immediately shut down, and primary heat transport system crash cooled to 300 deg. F. Shift fire fighting crew rushed to the affected area to extinguish the fire. At the fire site it was observed that the insulating material of the piping close to the main coolant pump was burning.

Category: Power Reactor Pakistan »

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Power excursion and subsequent plant trip

Due to problems in the Process Salt water heat exchangers, the performance of control room air-conditioning chillers (which is cooled by the process salt water) was affected, resulting in rise of the control room temperature (up to 87.5 deg. F). this rise in control room temperature adversely affected the satisfactory operation of the two regulating computers. At 0153 hrs controlling computer B started internal initialization frequently, while controlling computer A stalled at 0200 hrs. without any alarm.

Category: Power Reactor Pakistan »

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Release of iodine-131 from 131 production plant of nuclear chemistry division Pakistan Institute of Nuclear Science and Technology

On August 5, 20 and 21, unusual high activity up to 2203 Bq/m3 was reported by the Health Physics surveyor in the I-131 plant room during routine air sampling. Investigations revealed that the ventilation of the building was shut down during off-working hours. Due to the closure of exhaust/ventilation system, the negative pressure in I-131 cell was lost and the pressure in the cell became in equilibrium with room pressure, thereby by un-utilized Iodine-131 vapors in the fume hoods diffused and escaped the cell causing spread of radioactivity in the plant room.

Category: Other Pakistan »

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INES 0

STICKING OF SHIELD PLUG IN THE FUEL CHANNEL

Fuelling machine failed to unlock and remove the shield plug. The shield was manually removed by draining the fuel channel. During the operation, no person was exposed to high radiation fields.
Event Description:

Category: Power Reactor Pakistan »