安全壳卸压排放气体在线辐射监测仪的理论设计

针对核电厂事故条件下卸压排气过程中的放射性气体成分及气体监测要求，对核电厂安全壳卸压排放气体放射性活度探测装置进行了理论设计。并利用MCNP对探测装置进行了模拟计算，结果表明：在选择合理的测量准直器、屏蔽方案条件下，该装置可实现安全壳卸压排放气体放射性活度监测。最后通过实验验证表明，模拟计算结果真实可靠，可为核电厂卸压排气放射性监测设备的研制提供重要的理论支持和参考。

Theoretical Design of On-line Radiation Monitor for Containment Pressure Relief and Exhaust

Aiming at the radioactive gas compositions and monitoring requirements in the process of pressure relief and exhaust during the accident conditions of nuclear power plant, the theoretical design was made for the containment pressure relief and exhaust activity detector of the nuclear power plant. And the simulation computation was made for the performance of the monitor with the MCNP. The results show that under the conditions of choosing the reasonable measuring collimation aperture and shielding plan, the device can realize monitoring the total activity of containment pressure relief and exhaust. Through comparing the simulation computation results with the test data, it is shown that the results of simulation computation are credible, and provide an important theoretical support and reference for the development of the containment pressure relief and exhaust activity detector for the nuclear power plant.