Table of Content

20 October 2014 Volume 34 Issue 5

  

Control of Water Quality for Secondary Loop at Ningde Nuclear Power Plant Unit 1

Liu Heng, Wei Ting

RADIATION PROTECTION BULLETIN. 2014, 34(5):  1-6. 

Abstract ( 37 )   PDF (236KB) ( 114 )  

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A full range of control method for water quality is employed in the practices of secondary loop water control and management at Ningde nuclear plant unit 1, namely equipment maintenance and washing during commissioning, chemical control during outage, complete rinsing and cleaning of the secondary loop in the process of start, and water regulation and control during operation. These have obtained significant performance. Water quality analyses have shown that the secondary loop and steam generator have good water quality, resulting in reduced equipment corrosion to a larger extent.

Radiation Protection against Radioactive Source Terms at Ningde Nuclear Power Plant during Overhaul

Li Jianlong, Dong Zhengpeng, Zhang Wenfa, Wang Yonghui, Chen Wentao

RADIATION PROTECTION BULLETIN. 2014, 34(5):  7-11. 

Abstract ( 21 )   PDF (211KB) ( 48 )  

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The radioactive source terms at a PWR NPP during overhaul are presented, including radioactive aerosol, radioiodine and radioactive noble gases in PWRs is discussed, with description made of their properties and radiation protection measures.

Detection of Fuel Assembly Damage at Ningde Nuclear Power Plant by Using Sipping Device

Zhan Xiaocong, Liu Heng, Liu Hui, Gao Huibin, Jiang Yafeng, Wu Huaqiang, Pan Erquang, Bai Zhaotao, Yu Liangzhong, Chen Zhanggui, Liu Nin, Cai Xiangyu

RADIATION PROTECTION BULLETIN. 2014, 34(5):  12-16. 

Abstract ( 32 )   PDF (616KB) ( 37 )  

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The optimization and application of a domestic online sipping device are described in this paper. By optimizing and resetting key parameters, analyzing the threshold counting rate data in the form of chart, using ²⁴¹Am radioactive source to help locate the 81 keV position, we optimized the device state and sought out the failed fuel elements successfully during refueling outages.

Management of Safety of Industrial Radiography Sources at Ningde Nuclear Power Plant

Pu Lixing, Yang Jian, Zuo Guoyong, Guo Fei, Yang Yan, Dong Zhengpeng

RADIATION PROTECTION BULLETIN. 2014, 34(5):  17-20. 

Abstract ( 23 )   PDF (572KB) ( 30 )  

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Industrial radiography with high activity would cause damage to people in the case of improper regulatory control and even may bring about social fears to some extent. This paper presents analyses of the risks posed from industrial radiography and a summary of the safety of radiography management at Ningde nuclear power plant from the point of the view of radiation protection and safety management.

Radiation Protection Optimization for Removal and Installation of Nozzle Dams at Ningde Nuclear Power Plant

Deng Kechun, Guo Fei, Yang Yan, Yang Xiaoqiang

RADIATION PROTECTION BULLETIN. 2014, 34(5):  21-23. 

Abstract ( 22 )   PDF (115KB) ( 44 )  

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The removal and installation of nozzle dams (RIND) at primary water chamber of steam generator (SG) is one of the essential maintenance jobs, with high radiation risk during outage at a PWR nuclear power plant. This paper introduces the method and effect of implementing ALARA principle for RIND by radiation protection (RP) staff at Ningde nuclear power plant.

Optimization Management of Nuclear Frade Resin at Ningde Nuclear Power Plant

Hu Xiangmeng, Liu Hui

RADIATION PROTECTION BULLETIN. 2014, 34(5):  24-27. 

Abstract ( 23 )   PDF (180KB) ( 25 )  

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Radioactive resin at nuclear grade is one of the major origins of radioactive solid waste in nuclear power plants. In the context of the nation’s waste minimization management, it is necessary to take a range of measures to achieve optimal management of nuclear grade resin and to reduce the amount of radioactive waste as much as possible by improving waste source control, optimization of resin type, control of operation target and waste management.

Application of Wireless EPDs to High Risk Tasks a Nuclear Power Plant

Chen Ziliang, Zhong Ming, Su Chengjie, Ha Hanzhang, Chen Wentao

RADIATION PROTECTION BULLETIN. 2014, 34(5):  28-31. 

Abstract ( 26 )   PDF (1136KB) ( 17 )  

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This paper provides a description of the application of wireless EPDs to high risk tasks in PWR nuclear power plant during overhaul, ranging from washing and cleaning to removal and installation of steam generators nozzle dams, also with analyses made of remote real-time dose monitoring and its effectiveness. Actual application shows that the wireless EPDs can be used for the high radiation risk tasks in some complex working environment at nuclear power plants, to effectively control the doses to personnel and avoid the happening of over-dose events.

Improvement of Defoaming System at Ningde Nuclear Power Plant

Liu Heng, Wang Hongbo, Ye Ming, Ke Jianwei, Lin Jianxiong

RADIATION PROTECTION BULLETIN. 2014, 34(5):  32-34. 

Abstract ( 29 )   PDF (297KB) ( 14 )  

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In order to improve the quality of discharged water from Ningde Nuclear Power Plant and avoid the negative impacts on the public members and the environment, defoaming agent tests were launched in April 2013 at Ningde Nuclear Power Plant. The paper mainly introduces the defoaming system’s technical parameters suitable for Ningde Nuclear Power Plant, which may be used in design of the formal defoaming system.

Prevention and Removal of Radioactive Contaminatiion on Personnel Surface during Overhaul at Ningde Nuclear Power Plant

Yang Xiaoqiang, Yang Yan, Deng Kechun

RADIATION PROTECTION BULLETIN. 2014, 34(5):  35-37. 

Abstract ( 21 )   PDF (155KB) ( 44 )  

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Overhaul operation in Ningde nuclear power plant has a potential radioactive contamination risks to human body surface. This article describes several issues in need of attention in many aspects, involving the origin of these risks, surface contamination control, protection and control during operation, training strengthening, early decontamination, choice of decontaminant and method, decontamination, and protection and control against decontamination.

Monitoring of Plant Building for Radioactive Release during Normal Operation of Ningde Nuclear Power Plant

Guo Fei, Deng Kechun, Yang Yan

RADIATION PROTECTION BULLETIN. 2014, 34(5):  38-40. 

Abstract ( 21 )   PDF (464KB) ( 37 )  

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This paper describes a wide range of monitoring activities for airborne radioactivity released during normal operation from Reactor Building, auxiliary nuclear building and connecting building, and points out the issues in need of attention while conducting field survey screening by using KRT036MA.

Practice of Wano Chemistry Index Management in Ningde Nuclear Power Plant

Yu Liangzhong, Liu Heng, Liu Hui, Wu Huaqiang, Yang Jinlong

RADIATION PROTECTION BULLETIN. 2014, 34(5):  41-43. 

Abstract ( 42 )   PDF (157KB) ( 15 )  

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For the water quality management at Ningde NPP Unit 1, a variety of measures were taken at different stages of construction, involving equipment maintenance to reduce corrosion of thermal container during the installing stage of system, strict control over rinse and drain during debugging and startup stage, and check and removal of contamination sources in an one-by-one way. Thus, secondary loop water quality is continuously improved. Chemistry performance index (CPI) had reached advanced level of WANO in the first year of commercial operation.

Application of Portable Hydrogen Meter in Nuclear Power Plant

Chen Zhanggui, Bai Zhaotao, Wu Huaqiang, Zhan Xiaocong, Wang Long, Zhang Tao

RADIATION PROTECTION BULLETIN. 2014, 34(5):  44-46. 

Abstract ( 17 )   PDF (153KB) ( 13 )  

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During nuclear power plant operation and overhaul, the hydrogen concentration in reactor coolant system is subject to monitoring. This paper mainly describes the experimental process of rapid measurement of hydrogen in reactor coolant system by using portable ORBISPHERE 3654 hydrogen meter and the application of portable hydrogen meter in Ningde nuclear power plant. The results show that the portable hydrogen meter can rapidly and accurately measure hydrogen content in the RCP with optimal water sample flow at a rate of 270-310 mL/min.