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The Diverse Actuation System (DAS) serves as a critical component of the defense-in-depth architecture in nuclear power plants, with its protective functions being of paramount importance. During the 217 overhaul at Qinshan Phase II, the safety-grade nuclear island process instrumentation protection measurement cabinet system (KRG-P), originally implemented with analog technology, underwent a comprehensive digital control system (DCS) upgrade. To address potential software common cause failure (SWCCF) risks in the upgraded safety-grade DCS, a dedicated DAS was designed using a platform based on a different technical approach. The DAS at Qinshan Phase II adopted the HOLLiAS-N platform by HollySys for comprehensive design, including system architecture, functional allocation, fault default value configuration, and interface design. Verification was conducted on the implemented DAS, with results confirming full compliance with requirements. Field commissioning tests demonstrated successful first-time activation, providing valuable insights for similar future engineering upgrades.

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Design and Verification of the DAS System for the Digital Upgrade of KRG-P in Qinshan Nuclear Power Phase II

  • 会议论文

  • 发表日期：

    2025年

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  • Chengyu Wang,
  • Qing Zhou,
  • Yifan Wang,
  • Jingyin Li,
  • Zhao Chen,
  • Jing Wen

摘要

The Diverse Actuation System (DAS) serves as a critical component of the defense-in-depth architecture in nuclear power plants, with its protective functions being of paramount importance. During the 217 overhaul at Qinshan Phase II, the safety-grade nuclear island process instrumentation protection measurement cabinet system (KRG-P), originally implemented with analog technology, underwent a comprehensive digital control system (DCS) upgrade. To address potential software common cause failure (SWCCF) risks in the upgraded safety-grade DCS, a dedicated DAS was designed using a platform based on a different technical approach. The DAS at Qinshan Phase II adopted the HOLLiAS-N platform by HollySys for comprehensive design, including system architecture, functional allocation, fault default value configuration, and interface design. Verification was conducted on the implemented DAS, with results confirming full compliance with requirements. Field commissioning tests demonstrated successful first-time activation, providing valuable insights for similar future engineering upgrades.