China

INES-event
INES 3

Two occupational workers were injured by exposure of electron accelerator

Two occupational workers, Mr. Qiao and Wang were injured by exposure of high frequency-high voltage electron accelerator during its commission in Tianjin electrical wire factory. The energy of the accelerator is 2.5 MeV. Its cooling water tank under Ti window was needed to change cooling water pipe. On 21 November 1995, while the accelerator has high voltage, but no electron beam was provided, five workers entered the irradiation hall to change cooling water pipe for 7-8 minutes. They did not wear personal dosimeter. Two of them were exposed by electron beam which caused skin burns.

Category: Other China »

INES-event
INES 3

A worker was injured by an overexposure of Iridium-192 lost source from a gamma radiograph

A young worker, Mr Song who is not a radiation worker, was injured by an overexposure of an Ir-192 source lost from a gamma radiograph in the Construction Site for 300 kt Polyethylene Project of Jihua.
The Ir-192 source slipped out from the container of the gamma radiograph and dropped on the ground of the site when the container was carried and moved. Because the key to the safe lock of the container broken, the shutter cannot be locked.

Category: Other China »

INES-event
INES 0

TURBINE TRIP AND REACTOR SCRAM DUE TO TO AG WATER LEVEL HIGH-HIGH

The unit was in stable operation with a load of 290 MWe on December 15, 1995. Because some tubes of no. 3 high pressure heater leaked seriously, at 10:18 a.m. control room operator isolated the leaking no. 3 high pressure heater. The Main feedwater automatic regulation could not meet the requirement of water level control of SG and then manual control failed, which led to turbine trip and reactor scram because of "SG water level high-high" at 10:26:50 a.m.

Category: Power Reactor China »

INES-event
INES 1

DROP TIME OF CONTROL RODS OUT OF CRITERION

After first refuelling outage of Unit 1, the rod drop test was performed in hot shutdown conditions on 14 February. The results showed an increase of rod drop time T5 (the drop time to the dash pot entry) of 0.3 seconds in average comparing with commisioning results and 7 control rods exceeding the criterion (2.15 seconds). The maximum drop time was 3.17 seconds for one control rod.

Category: Power Reactor China »

INES-event
INES 0

REACOR SCRAM AND TURBINE TRIP BY RCP BUS LOW VOLTAGE

The unit was at 240 MWe operation before the event occurred. At 4:16 several alarm signals occurred as mentioned below:
1) the signal of 6 kV bus I and Bus II voltage circuit breaker, 2) the signal of 380 V bus voltage circuit breaker, 3) the signal of the AC voltage of kilowatt-hour meter of 220 kV bus I disappearance.
In the meantime, the voltage of generator and 6 kV bus declined which made the RCP bus voltage too low and resulted in reactor scram and turbine trip.

Category: Power Reactor China »

INES-event
INES 0

REACTOR SCRAM BY ATWT SIGNAL DURING PERIODIC TEST

The unit was at full power operation before the event with output of 984 MWe. During performance of periodic test on protection channel SIP IV on ATWT signal logic, low level signals on 3 steam generators appeared simultaneously at 22:00 and then appeared main feedwater flow rate low, which caused reactor scram by "feedwater flowrate low plus ATWT signal", the unit wasdisconnected from the grid for 6 hours.

Category: Power Reactor China »

INES-event
INES 0

TURBINE TRIP ON SG HIGH-HIGH WATER LEVEL FOLLOWED BY REACTOR TRIP

On 30 March 1993, the unit was operating at 300 MWe full power.

Category: Power Reactor China »

INES-event
INES 3

COBALT-60 SOURCE LOSS

One piece of a Cobalt 60 source was lost in Xinshou District, Shanxi Province, which caused on Dec. 3, 1992, the death of Mr. Zhan Youchang who picked up the lost Cobalt-60 source. His brother and father also died due to overexposure on December 7 and 10, respectively.
The lost Cocalt 60 source has been found and stored safely.

Category: Irradiation/Accelerators Facility China »