• 辐射防护监测 •

### 田湾核电站弱贯穿辐射调查与个人剂量监测

1. 1.江苏核电有限公司,江苏 连云港 222000;
2.中国辐射防护研究院,太原 030006
• 收稿日期:2018-11-27 发布日期:2020-05-15
• 通讯作者: 韦应靖。E-mail:weiyj531@sina.com
• 作者简介:侯炳君(1989—),男,2011年毕业于兰州大学核科学与技术学院辐射防护与环境工程,工程师。E-mail:houbja@cnnp.com.cn

### Weakly penetrating radiation and personal dose monitoring in Tianwan Nuclear Power Station

HOU Bingjun1, ZHAO Honghe1, WEI Yingjing2, LI Zhonghua1

1. 1.Jiangsu Nuclear Power Co. Ltd., Jiangsu Lianyungang 222000;
2.China Institute for Radiation Protection, Taiyuan 030006
• Received:2018-11-27 Published:2020-05-15

Abstract: During the two refueling outages of the Tianwan Nuclear Power Station, the investigation of weakly penetrating radiation of Units 1 and 2 was carried out, mainly including radiation dose rate monitoring at sites that may have a higher probability of weakly penetrating radiation, the weakly penetrating radiation dose monitoring received by some representative workers and the protective effect test of protective equipment. From the measurement results of weak penetrating radiation, the radionuclides deposited on the surface of the maintenance equipment of Tianwan nuclear power plant are basically the same, including 58Co, 60Co, 95Nb, 95Zr, 51Cr, 124Sb, 54Mn, 110mAg, 59Fe, etc. The β-ray energy is mainly concentrated below 600 keV.It is measured that the maximum value of H·′(3)/H·*(10) is 2.08 and H·′(0.07)/H·*(10) has a maximum value of 34.9 for reactor coolant pump item; H·′(3)/H·*(10) has a maximum value of 2.58 and H·′(0.07)/H·*(10) has a maximum value of 10.7 for the steam generator item; H·′(3)/H·*(10) has a maximum value of 1.25, H·′(0.07)/H·*(10) has a maximum value of 26.4 for the reactor item; The maximum value of H·′(3)/H·*(10) is 3.80 and H·′(0.07)/H·*(10) has a maximum value of 55.6 for the other pumps item; H·′(3)/H·*(10) has a maximum value of 1.15 and the monitoring value of H·′(0.07)/H·*(10) is 4.18 for the valves item. The maximum value of H·′(3)/H·*(10) is 1.53 and H·′(0.07)/H·*(10) has the maximum value of 2.16 for the other items. The results of weakly penetration dose monitoring showed that the maximum values of Hp(0.07)/Hp(10) and Hp(3)/Hp(10) are 7.66 and 3.73 respectively, and the personal dose equivalent Hp(10) during the overhaul monitoring period are all below 0.35 mSv. In addition, the personal dose equivalent Hp(10) of the entire staff in these overhauls is less than 2 mSv. It indicates that Hp(0.07)and Hp(3) are less likely to exceed the national standard personal dose limit of 500 mSv/a and the new IAEA limit of 20 mSv/a, respectively. It is suggested to carry out eye crystal dose and skin dose monitoring for special maintenance personnel such as reactor coolant pump maintenance, reactor pool cleaning, KBA system pumps and valves maintenance, radioactive waste sorting, etc.

• TL75+1