Manual shutdown to prevent problems before they happen
Manual, heap was implemented to find out the cause.
The investigation revealed that the supply of cooling water to the stator coils leaked into the cooling water system side. A survey of the progress of this crack inferred that when the insulating rubber tube was manufactured at the factory, there was a crack inside the rubber tube material, and later, cracks were generated due to the stator coils generated by the operation of the generator.
At present, the insulating rubber tube that has cracked has been replaced, and the other 143 insulating rubber tubes of the generator have been replaced.
In addition, the company's Fushun 1 nuclear power plant 64 unit boiling water reactor set the power of 00 stomach after the July 21st earthquake in the Ibaraki County, the exhaust gas treatment system in this case, for the sake of safety, the manual shutdown was carried out to pay This survey.
The investigation revealed that a total of six safety valves in the crossover circuit of the steam turbine plant were cracked at the joint of the small stern tube. The air sucked from here separated the condenser, resulting in the flow test of the exhaust gas treatment system. increase. After a detailed investigation of the crack portion, the safety valve of the cross-rotating tube of the small-diameter tube is attached sharply, which is liable to cause cracks. Due to the repeated start-up and shutdown of the reactor, the hot junction of the cross-return pipeline causes the joint to produce ten. The stress, so the cracked snail groove begins to expand, and finally penetrates the entire bolt, and finally opens and creates a crack due to the seismic stress.
In the past, the small diameter 1 pipe of the flexion was completely replaced, and the secondary bolt was no longer used.
The small incidents at the Tokyo Electric Power Corporation’s nuclear power plants have no external radiation effects.
The operating license of the Zanhuang Houkun School Group has been extended for 20 years. This is after the historic US Nuclear Regulatory Commission has agreed that it will be located in South Carolina in March 2000 to the Calvert Suspension Power Station in Xuna, all three of the Lake Okoni power stations can be proved after the extension. For the first time to commercial nuclear power plants
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