Fully digitized instrument and control system is an important part of advanced nuclear power plant ( NPP) ,and it is a critical role to protect the safe operation of nuclear power plant. Through studying various technologies, including the safety level digitized I&C platform, dedicated I&C system,management tools software,equipment verification,V & V,diversity and defense in depth,etc. ,the technology of NPP digitized I&C system is mastered, and the productization and engineering application of nuclear level digitized I&C platform “FirmSys” are achieved. At present,this platform has been evaluated by experts,and applied in No. 5# & 6# units of Yangjiang nuclear power plant,which further enhances the independent rate of nuclear power plant in our country.%全数字化仪控系统是先进核电站的重要组成部分，对保护核电站安全运行具有至关重要的作用。通过对安全级数字化仪控系统平台、专用仪控系统、管理工具软件、设备鉴定、V&V技术、多样性及纵深防御技术的研究，掌握了核电站数字化仪控系统技术，实现了核级DCS平台“和睦系统”的产品化及其工程应用。目前，该平台已通过专家鉴定，并开始在阳江核电站5#、6#机组进行工程实施，进一步提高了我国核电站的自主化率。
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