A Qualitative Assessment of Current CCF Guidance Based on a Review of Safety System Digital Implementation Changes with Evolving Technology

Korsah, Kofi¹  Muhlheim, Michael David¹  Wood, Richard¹ 

[1]Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

关键词: SAFETY ANALYSIS;    NUCLEAR POWER PLANTS;    ON-LINE CONTROL SYSTEMS;    WATER MODERATED REACTORS;    IMPLEMENTATION;    US NRC;    WATER COOLED REACTORS;    DIGITAL SYSTEMS;    REGULATORY GUIDES;    EVALUATION;    FAILURES;    RECOMMEN;   

DOI  :  10.2172/1263857
RP-ID  :  ORNL/SR--2016/148
PID  :  OSTI ID: 1263857
Others  :  Other: 453040374
Others  :  TRN: US1601613

美国|英语

来源: SciTech Connect

【 摘 要 】

The US Nuclear Regulatory Commission (NRC) is initiating a new rulemaking project to develop a digital system common-cause failure (CCF) rule. This rulemaking will review and modify or affirm the NRC's current digital system CCF policy as discussed in the Staff Requirements Memorandum to the Secretary of the Commission, Office of the NRC (SECY) 93-087, Policy, Technical, and Licensing Issues Pertaining to Evolutionary and Advanced Light Water Reactor (ALWR) Designs, and Branch Technical Position (BTP) 7-19, Guidance on Evaluation of Defense-in-Depth and Diversity in Digital Computer-Based Instrumentation and Control Systems, as well as Chapter 7, Instrumentation and Controls, in NRC Regulatory Guide (NUREG)-0800, Standard Review Plan for Review of Safety Analysis Reports for Nuclear Power Plants (ML033580677). The Oak Ridge National Laboratory (ORNL) is providing technical support to the NRC staff on the CCF rulemaking, and this report is one of several providing the technical basis to inform NRC staff members. For the task described in this report, ORNL examined instrumentation and controls (I&C) technology implementations in nuclear power plants in the light of current CCF guidance. The intent was to assess whether the current position on CCF is adequate given the evolutions in digital safety system implementations and, if gaps in the guidance were found, to provide recommendations as to how these gaps could be closed.