The continuous monitoring device of boron concentration in primary system of PWR nuclear power plant is called boron meter,and during normal operation of the boron meter,it is necessary to use a neutron source whose activity meets the requirements of on-line boron concentration monitoring.In order to ensure that while the operator is debugging or using boron meter,the exposure dose is below the limit and in order to get the distribution of neutron and gamma outside the boron meter,MCNP was used to calculate the radiation shielding of boron meter based on Pu-Be neutron source,and the radiation dose distribution in six directions outside the boron meter detector was measured,and the calculated results were compared with the measured results.The results show that the calculated neutron and gamma dose rates outside the boron meter detector are in good agreement with the measured values,the distribution measuring result of dose rate outside the boron meter detector shows that the dose rate decreases significantly by distance.As long as the operation time and operating distance are controlled,the radiation safety of personnel can be ensured.
关键词
钚铍中子源/硼表/屏蔽计算/核电站
Key words
Pu-Be neutron source/boron meter/shielding calculation/nuclear power plant
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