现有的CANDU重水堆(简称“重水堆”)以天然铀作为燃料,但重水堆由于其独特的堆芯设计,具有较好的燃料灵活性,还可以烧低浓铀、回收铀和钍等燃料.研究现有重水堆改烧钍燃料后对堆芯特性和运行安全的潜在影响.使用DRAGON程序建立了重水堆的无限栅元模型,研究比较了钍燃料和天然铀燃料的重要堆芯特性参数.结果表明,尽管2种燃料下的堆芯特性有所差异,但钍燃料利用实际上有助于提升重水堆的运行安全.

This paper introduces how the Third Qinshan Nuclear Power Co.,Ltd.digest and absorb imported technology,and insist on improvement and innovation to upgrade the comprehensive performance of CANDU nuclear power plants;deeply develop the advantage of CANDU technology to vigorously promote the CANDU cobalt-60 production and technical development for recycling uranium and thorium resources.Through constant technological innovation and technology improvement,the safety and reliability of nuclear power plant is continuously improved,and the comprehensive operation level of nuclear power plant keeps abreast with the international advanced level.Good economic,environmental and social benefits are achieved.

秦山三核通过技术创新,坚持进行电站系统和设备的技术改进,提升了机组综合性能,对汽机功率实施了提升改造,实现钴60同位素大批量生产,开发了重水堆利用回收铀技术,开展了钍资源利用研究。科技创新将继续为秦山三核发展注入不竭的动力。

A risk monitor,an integrated risk analysis tool for real-time monitoring,was widely used in the management of nuclear power plants around the world.A risk monitor prototype system,named RiskAngel,has been developed by FDS Team,China,in which the fault tree analysis engine RiskA was integrated.Based on these,Third Qinshan nuclear power plant Risk Monitor(TQRM) has been developed considering the safety characteristics and the management process of Third Qinshan nuclear power plant.The status and development trend of risk monitor were given in this paper.An overview of the architecture and functions of TQRM was introduced.The key algorithms and technical features were also presented.

与作为技术主流的压水堆相比,重水堆因其独特的堆芯设计和运行特点,具有燃料灵活多样、铀资源利用率高、可利用钍资源和回收铀、可大量生产60Co等多种同位素的技术优势。秦山三核正在根据重水堆的比较优势开发重水堆相关技术,目前已经实现60Co生产棒束入堆,并正在联合国内外科研院所研发重水堆回收铀应用和重水堆利用钍资源技术。一旦实现重水堆利用回收铀或重水堆利用钍技术,重水堆运行将不再大量消耗天然铀资源,对后续在其他堆型推广应用,多渠道解决核燃料供应并促进核电产业的科学发展均意义重大。

Qinshan NPP Phase Ⅲ(PHWR) Project is one of the national key projects during the"9th Five-year Plan",the first commercial heavy water reactor nuclear power plant in China,and the biggest trade project between China and Canada.Qinshan Phase Ⅲ Project adopts the proven CANDU-6 reactor technology and refers to Wolsong Unit 3 and Unit 4 in Korea.Because of the difference of the site condition and standards,specific country situation and lack of operation feedback,it is greatly challenged to keep the safe and stable operation of Qinshan Phase Ⅲ plant during earlier commercial operation.Qinshan Phase Ⅲ analyzed and investigated the hidden troubles and hotspots,proposed the modifications and technical improvements,and great improvements were achieved in safety performance,operating performance,and economic efficiency.This paper describes the important modifications and technical improvements in Qinshan Phase Ⅲ,and the effects after implementation,which can serve as reference to similar projects.

With the development of electronic technology, especially computer technology, and with the completion of CANDU 9 design, AECL likes to transplant the big screen display of CANDU 9 to Qinshan CANDU 6 plant so as to improve human engineering and update the system design, incorporating such design changes as the safety parameter display, technical support center, emergency response interface which are required by the Contract. The new main control rooms of Qinshan CANDU units after improvements are briefly presented.