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Haiyanmiao, China

Peng F.,Nuclear Power Qinshan Co.
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2015

Fuel assembly gripper driving circuit is a key part of the refueling machine. Its reliability has great significance for safety and stability of refueling operation. A number of tripping faults have occurred since the operation of the refueling machine No.1 and No.2 of Qinshan nuclear power plant II, and it has a certain impact on the refueling operation. With gripper driving circuit as the research object, considering the fault phenomenon and the maintenance experiences, the reasons of key components defect were analyzed in detail, the troubleshooting methods and solutions were summarized, and the measures to solve the problem was provided. ©, 2015, Editorial Office of Nuclear Power Engineering. All right reserved. Source


Kong W.,Nuclear Power Qinshan Co.
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2015

Service water system operation requirements and circulate water system maintenance needs are analyzed, and it is determined that the circulate water system maintenance will result in the availability of service water pumps. Solutions are proposed to resolve the conflicts between the circulate water system maintenance and the service water system availability, that will improve the safety and economy of the plant. ©, 2015, Editorial Office of Nuclear Power Engineering. All right reserved. Source


Guo P.,Nuclear Power Qinshan Co.
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2015

False alarm problem of radioactive iodine activity monitor during commissioning in nuclear plant is analyzed and studied. Results show that the instrument background noise, ambient gamma radiation field and other non nuclide measurement statistics will cause the measured value distortion; the using of the 131I detecting efficiency to calculate the 131I to 135I total radioactive iodine volume activity will cause the distortion of the measured results. Through the analysis of the reasonability of the set area of the radioactive iodine monitor energy window, and to change the measurement window energy 100~2000 keV to 310~410 keV, only 131I is monitored. After the implementation of this program, the instrumentation values are accurate and no false alarm occurs. ©, 2015, Yuan Zi Neng Chuban She. All right reserved. Source


Guo P.,Nuclear Power Qinshan Co.
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2015

Based on the collection and statistical analysis of the radiation monitoring instrument calibration data, and taking the typical GIM204 gamma dose rate monitoring device as an example, the feasibility is demonstrated by the experience feedback method, to adapt to the implementation of the refueling scheme for a long period of time in Tianwan nuclear power station. Studies have shown that when the calibration cycle of GIM204 is extended from1 year to 1.5 year, the relative calibration error does not exceed the allowable values, and satisfies the requirement on refueling cycle extension. ©, 2015, Editorial Office of Nuclear Power Engineering. All right reserved. Source


Sun J.,Nuclear Power Qinshan Co.
Hedongli Gongcheng/Nuclear Power Engineering | Year: 2015

In the pressurized water reactor which uses ammonia to adjust the feedwater pH, the high PH control method is usually used to inhibit the flow accelerated corrosion (FAC) in the secondary system. But the increasing Ammonia concentration will shorten the lifetime of the resin in the steam generator blowdown system demineralizer, which will lead to the increasing of waste, heavy loading, and operation cost. By the ammonia-saturated operation test of the resin in the steam generator blowdown system demineralizer in Qinshan phase II, we found that the ammonia-saturated operation is feasible; and it is an effective method to balance the demand of high PH value and the lifetime of demineralizer resin. And we prefer to use 2 demineralize systems together, one with ammonia-saturated operation and another one with hydrogen operation. © 2015, Yuan Zi Neng Chuban She. All right reserved. Source

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