本文从核电厂控制区两种进出模式在防护用品的使用量、清洗防护用品的废液产生量以及固废产生量方面对日常运行期间和大修期间进行了运行成本分析.分析可知,采用清洁控制区模式控制区进出模式无论在日常运行期间还是大修期间,其运行成本均低于传统"七件套"模式.尤其是日常运行期间,清洁控制区模式的运行成本仅占"七件套"模式的约三分之一.
某核电厂采用了国际上比较先进的"EVEREST"进出控制区模式,人员可以穿着普通劳保服进出辐射控制区.为避免或减少辐射控制区内因设备意外泄漏导致的污染扩散和人员沾污,该核电厂控制区采用潜在污染风险管理方式,包括通过分析反应堆回路主要设备的放射性介质包容可靠性以及已发生的污染事件原因,识别潜在污染区域,对控制区进行污染分区,并对潜在污染区和实际污染区设置边界,对进入的人员进行相应的防护.
The method for estimating the air contamination conditions in EPR reactor building during power operation and shutdown is described,and a model for estimation of the H-3 activity concentration is established.Air contamination levels in the equipment room and the work room of reactor building during the power operation and shutdown are evaluated.The results show that H-3 is the main contributor for air contamination in reactor building during the shutdown with a concentration in air of about 0.07 DAC,which could cause a collective dose of about 56 man · mSv in a typical outage
There is a strong radioactive source in the EPR's AMS calibration equipment,but the shielding design has a defect,which will increase the irradiation dose and unplanned irradiation risk.The equipment was redesigned to decrease the dose and the risk.Besides,the effect evaluation was implemented based on MCNP software calculation.Finally,the optimization of radiation protection is realized.The design theory and the calculation method are introduced in the paper.
从第3代中国先进压水堆(CEPR)机组的辐射工作场所分区、源项控制、维修优化和厂房设计等方面,介绍了台山核电厂CEPR机组的辐射防护最优化设计.分析表明,该CEPR机组的辐射防护最优化设计是合理可行的,其预期的年平均集体剂量相较于现运行的压水堆核电厂处于较先进的水平.
The application of differential management in production preparation work of radiation protection for CEPR units is presented ,in terms of regulations and standards ,personnel preparation ,controlled area man-agement ,material preparation ,design document review ,system ,document preparation ,experience feedback and first overhaul preparation .
This article introduces the assessment method for the main radionuclides in need of control during outage of CEPR unit, and the suggested values are given.
