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RIC 2011 Adequacy of Station Electric Distribution System Voltages—Degraded Voltage Protection Kenn Miller Division of Engineering/NRR March 9, 2011 1 Purpose of Session • Ensure that design issues concerning station electrical distribution system/offsite power system interface and degraded voltage protection are addressed • Staff is issuing the Regulatory Issue Summary to clarify the existing staff guidance and positions 2 NRC Regulation and Guidance • Title 10 of the Code of Federal Regulations Part 50, Appendix A, General Design Criteria 17, “Electric Power Systems” y • June 1977 Letter to all Operating Reactors, “Statement of Staff Positions Relative to Emergency Power Systems for Operating Reactors” • Generic Letter 79-36, “Adequacy of Station Electric Distribution Systems Voltages” • Branch Technical Position BTP-1 (Later BTP 8-6) of NUREG 0800 / Standard Review Plan 3 1 NRC Staff Positions on DVRs (1977 Letter) • Voltage calculations are necessary to develop DVR settings, ensuring 1E equipment is supplied with adequate voltage • Voltage calculations should model the plant safety related electrical distribution system and offsite circuits • Voltage calculations should have cases that demonstrate the protection of 1E systems by the DVR • DVR time delays must support FSAR accident analyses and protect 1E systems and components while not reducing availability of adequate offsite power 4 NRC Staff Positions on Offsite Circuit / Station Distribution Design Interface • The offsite electric power system is the preferred source of power to the plant • Voltage calculations should demonstrate voltage requirements of all plant components are satisfied in all conditions • Voltage analysis, while supplied from the offsite circuit, should be based on the operating voltage range of the transmission network connection. 5 NRC Staff Positions on Offsite Circuit / Station Distribution Design Interface (cont.) • Voltage calculations should model voltage at the terminals of each safety related load. • All plant electric distribution system automatic functions should be assumed to occur as designed • Manual load shedding should not be assumed 6 2 Questions? 7 3