di&c project & lead-plant experiences gordon clefton march 11, 2009
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DI&C Project & Lead-Plant Experiences
Gordon CleftonMarch 11, 2009
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Digital Experiences --- Agenda
–Why Digital Upgrades
– Digital Operating Experience at Oconee
– Lessons Learned with Oconee’s LAR
– Digital Project Path Forward
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Why Digital Upgrades (1 of 1)
Driving Forces for Digital Upgrades•Existing plant systems are obsolete
•Spare parts are limited
•Component repairs are addressing near-term equipment issues
•Elimination of single failure vulnerabilities through redundant equipment
•Enhancements to system design and functions
•Significantly improved on-line monitoring and channel check capability
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Digital Operating Experience at Oconee (1 of 2)
Digital Upgrades completed on Oconee Units:– Integrated Control System (1996-1998)
– Operator Aid Computer (1998-1999)
– Main Turbine Control System (2002-2004)
– Digital Control Rod Drive Control System
– Turbine Supervisory Instrumentation
– Foundation Fieldbus System for Instrument Loop Upgrades (Process Control System)
– Electrical Generator Automatic Voltage Regulator
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Digital Operating Experience at Oconee (2 of 2)
Positive OE from Digital Upgrades:• Replaced obsolete systems which had
performance problems• Improved system and plant reliability by
installing redundancy to eliminate single point vulnerabilities
• Improved reactivity management by increasing system stability and reducing operator burden during power maneuvers
• Significantly improved:– System monitoring – Online functional check capabilities– Improved diagnostic capabilities
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Lessons Learned with Oconee’s LAR (1 of 1)
For digital upgrades requiring NRC approval (RPS & ESPS), lessons learned by Oconee:
Regulatory findings Regulatory standards High quality, accurate, and timely documentsMilestone scheduleCommunicationsNRC/Vendor/Utility Engineering strength
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Digital Project Path Forward (1 of 1)
Interim Staff Guidance (ISG):– Revise DI&C-ISG-02, ISG-04, & ISG-05
– Create DI&C-ISG-06 & ISG-07
– Roll ISG content into permanent guidance
Digital Project Workshops– Lessons Learned (Oconee & Wolf Creek)
– LAR Preparation using ISGs
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DI&C Project & Lead-Plant Experiences
– Questions ?
– Items to carry to NEI ?
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