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INES-event
INES 0

AUTOMATIC REACTOR SHUTDOWN CAUSED BY GENERATOR TRIP

On August 9, 1994 unit 1 was under normal operation codntions at a thermal power of 2100 MW with turbogenerator no. 2 at an electrical power of 750 MW. At 3:17 am an exciter failure caused a generator trip and subsequent turbine trip followed by the reactor shutdown. The generator trip was caused by wrong switching of the exciter current circuits. The safety systems functioned in full.
INES level 0 (Table II - A1 user's manual)

Category: Power Reactor Ignalina Lithuania »

INES-event
INES 0

REACTOR SHUTDOWN CAUSED BY LEAKAGE THROUGH A JOINT WELD IN THE ECCS PIPEWORK

On August 21, 1994 Unit 1 was under normal operation conditions at a thermal power of 2340 MW with turbogenerator no. 2 at an electrical power of 750 MW. At 20:00 am routine surveillance detected the increased leakage in reactor building room 208/l where the ECCS pipe headers were located. The radiation monitoring system confirmed the presence of water leakage in the reinforced leaktight compartments encasing the left loop of the coolant recirculation circuit. At 21:32 the reactor was shut down in order to locate and eliminate the leak.

Category: Power Reactor Ignalina Lithuania »

INES-event
INES 1

MALFUNCTION IN THE SYSTEM OF NEUTRON CONTROL OF REACTOR POWER FOLLOWING THE REPLACEMENT OF A CONTROL ROD SWITCH

On July 11, 1994, Unit 2 was under normal operation at a thermal power of 2100 MW, when one of the two control rod switches was replaced in order to correct a small malfunction. After the replacement the switch was tested. In the neutral position the local automatic control rod selected for test performance failed to function (it was lifted upwards by 0.5m). The switch was replacedby a new one and tested again. This time the test was successful. It later emerged that interconnection in the first switch was not made to design.

Category: Power Reactor Ignalina Lithuania »

INES-event
INES 0

AUTOMATIC REACTOR SHUTDOWN CAUSED BY SPURIOUS CLOSING OF THE GATE VALVE AT THE PIPELINE FEEDING THE MAIN CONDENSATE HEATER WITH HEATING STEAM

On July 8, 1994 unit 2 was under normal operation conditions at a thermal power of 2180 MW. The reactor was operated in a single turbogenerator mode. Turbogenerator no. 4 was at an electrical power of 690 MW. At 2:07 am the gate valve at the pipeline feeding the main condensate heater (Low Pressure Heater no. 4) with heating steam closed spuriously because of a failure of the control circuit. The increased water level in LPH no. 4 caused TG no. to trip. The reactor was shut down by the reactor protection system

Category: Power Reactor Ignalina Lithuania »

INES-event
INES 1

DETERIORATION OF THE PRIMARY CIRCUIT INTEGRITY

In the afternoon of Feb. 25, 1994 unit no. 2 of Ignalina NPP was shut down to locate the leakage in the primary circuit unservicable compartment enclosing the multipurpose valves and reactor channel flowmeters and eliminate its causes. On February 28 the primary circuit underwent pressure and visual tests. The leaks were detected in the detachable joints of multipurpose valve 38-42 and ball-type flowmeter 13-18. The leaks were caused by the damage of the sealing gaskets. The event was provisionally rated as INES level 0, as per table II (A-1).

Category: Power Reactor Ignalina Lithuania »

INES-event
INES 1

FAILURE OF THE FOAM FIRE-EXTINGUISHING SPRINKLER SYSTEM TO OPERATE FOR 16 HOURS DUE TO FROZEN PIPES

The event occurred while unit 1 was in normal operation. The foam fire-extinghushing sprinkler system is meant for fighting a fire in the oil systems of the turbine building and main circulation pumps. In the morning of 7 February unit 1 pumps were put oput of operation for maintenance. The said fire extinguishing system was integrated with the similar system in unit 2. The latter with pumps ready to bstarted automatically. In the afternoon the regular

Category: Power Reactor Ignalina Lithuania »

INES-event
INES 0

MANUAL REACTOR SHUTDOWN CAUSED BY THE FAILURE OF THE MANUAL REACTOR CONTROL ROD SYSTEM

On January 27, 1994 unit 2 was in normal operation mode. At 2:31 the operator shut down the reactor by pushing the emergency knob because of the failure of the reactor control rod system. The failure was reasoned by a mechanical malfunction of one of the controls on the reactor control board. The opertor followed the regular prescribed procedures. The reactor shutdown was normal. The regular reactor protection system, automatics, safety systems acted within the design limits. Neither on-site nor off-site radiation impact occurred. The event was rated provisionally as INES level 0.

Category: Power Reactor Ignalina Lithuania »

INES-event
INES 0

REACTOR SHUTDOWN CAUSED BY THE LEAKAGE DETECTED IN ONE OF THE REACTOR BUILDING ROOMS

On January 18 Unit 1 of the Ignalina NPP has been shut down because of the leakage rated 1.5 l/min. which was detected in one of the Reactor Building Rooms. In accordance with the design procedure this leakage has been removed to the existing leakage collection system without its intruding the serviceable areas of the unit. The off-site and on-site radiological situation has not changed. After the reactor cooldown additional information about the damage will be available.

Category: Power Reactor Ignalina Lithuania »

INES-event
INES 1

LEAKAGE OF REACTOR CIRCUIT PIPE 76 MM DIAMETER FROM REACTOR CHANNEL 32-24 TO THE DRUM SEPARATOR

On October 6, 1992 the plant radiation monitoring system detectors indicated the increase of the radioactivity 2xE-12 Cu/l to 1,6E-11 Cu/l in the room where the drum separators of the reactor circuit right side are located. Due to this the radioactivity level was constantly monitored. On October 13, 1992, the radioactivity level in the room was stabilized at 5,6E-10 Cu/l. Radioactivity increase 1xE-12 Cu/l to 1,3E-10 Cu/l was also monitored out of the room (above the reactor) which is common for the ventilation system and the drum separators.

Category: Power Reactor Ignalina Lithuania »

INES-event
INES 0

DENT ON THE PIPE OF REACTOR CHANNEL 10-33 TO THE DRUM SEPARATOR

After the incident which occurred at Ignalina 2 on October 15, 1992, the pipelines metal inspection programme for reactor circuit, Unit 1 was expanded. An external examination of elbows of the pipes of reactor channels to the drum separators was performed. During the inspection a dent about 3 mm in depth was discovered on the elbow of the pipe of reactor channel 10-33.
Since the strength calculations do not allow operation with such a defect the damaged part of the pipe was replaced by a new one.
Basic level rating:0 (Table III.2-A1)
Final Rating level:0.

Category: Power Reactor Ignalina Lithuania »