ML16242A238
| ML16242A238 | |
| Person / Time | |
|---|---|
| Site: | Mcguire, Catawba, McGuire  |
| Issue date: | 08/30/2016 |
| From: | Duke Energy Corp |
| To: | Office of Nuclear Reactor Regulation |
| Sreenivas V | |
| References | |
| Download: ML16242A238 (17) | |
Text
Catawba / McGuire Proposed Changes to Technical Specification 3.8.1, AC Sources - Operating August 30, 2016
Duke Energy Attendees Art Zaremba (Manager, Nuclear Fleet Licensing)
Jordan Vaughan (Senior Nuclear Engineer, Fleet Regulatory Affairs)
Ed Wiegert (Lead Nuclear Engineer, PRA)
Mark Hutcheson (Project Manager, Major Projects)
Ed Schulte (Project Engineer, Major Projects)
Mike Swim (System Engineer, Catawba Nuclear Station)
Randy Tracey (Operations) 2 2
Agenda Introductions / Opening Remarks Emergency Supplemental Power Supply (ESPS) Project Overview License Amendment Request Overview Probabilistic Risk Assessment (PRA) Overview 3
ESPS Project Overview Project
Description:
Installation of an Emergency Supplemental Power Source (ESPS) that will support obtaining a 14 day Allowed Outage Time (AOT) for Emergency Diesel Generator (EDG) maintenance and repair (planned and unplanned) in accordance with Branch Technical Position 8-8. The electrical output from the ESPS system will replace the power supplied from any one of the four Emergency Diesel Generators.
Background:
Site locations will be inside the Protected Area. Commercially available diesel generator sets (two) and the switchgear set will be installed inside vendor supplied, weather resistant enclosures. The enclosures are designed to meet commercial International Building Code (IBC) criteria, including seismic loading and wind loading up to 130 mph. The ESPS system will connect to the U1 and U2 6.9 kV switchgear - existing plant infrastructure will then feed the 4160 V emergency buses. A load bank is provided to allow testing of the ESPS diesel generator sets without impact to plant systems.
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ESPS Project Overview The ESPS diesels provide an independent, diverse, defense in depth, AC power source with sufficient capacity to bring a unit to the safe shutdown condition.
At McGuire the system will consist of two (2) Caterpillar C175-16 diesel gensets with a combined electrical output of 5000 kW.
At Catawba the system will consist of two (2) Caterpillar C175-20 diesel gensets with a combined electrical output of 6300 kW.
ESPS is capable of providing power to any one of the four (4) emergency buses via the Normal Onsite Power Distribution 6.9 kV buses.
System must be manually started and aligned to the desired 6.9 kV bus.
Actions to start and align the ESPS system can be accomplished within one hour.
Both Catawba and McGuire are 4 hour4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> Station Blackout coping plants.
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Catawba ESPS Project Overview 2/15/17 2/15/18 2/18/16 LAR LAR Released SDG Submittal Approval Specs for Bid 6/15/16 Audited Factory 1/21/18 QA Program Approve SDG (Pre-Award) Mod 8/1/16 10/17/17 7/30/18 Awarded SDG Award SDG SDG Engineering Contract Manufacturing Contract Delivery 4/29/17 - 5/28/17 3/17/18 - 4/12/18 11/17/18 - 12/13/18 9/21/19 - 10/20/19 4/21/16 - 6/6/16 Unit 1 Unit 2 Unit 1 Unit 2 Conducted Electrical Tie-In Electrical Tie-In Commissioning Commissioning Bid Review 9/26/17 - 1/15/18 8/1/18 - 10/1/18 Site Prep SDG Installation and Checkout January 2016 January 2017 January 2018 January 2019 6
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McGuire ESPS Project Overview 2/15/17 2/15/18 2/18/16 LAR LAR Released SDG Submittal Approval Specs for Bid 6/15/16 Audited Factory 12/18/17 QA Program Approve SDG (Pre-Award) Mod 8/1/16 6/13/17 4/17/18 Awarded SDG Award SDG SDG Engineering Contract Manufacturing Contract Delivery 4/1/17 - 4/27/17 9/23/17 - 10/19/17 9/15/18 - 10/14/18 3/16/19 - 4/14/19 4/21/16 - 6/6/16 Unit 2 Unit 1 Unit 2 Unit 1 Conducted Electrical Tie-In Electrical Tie-In Commissioning Commissioning Bid Review 5/11/17 - 8/30/17 4/19/18 - 6/18/18 Site Prep SDG Installation and Checkout January 2016 January 2017 January 2018 January 2019 7
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LAR Overview - Proposed Change #1 Extend CNS and MNS Technical Specification 3.8.1, AC Sources - Operating Completion Time (CT) for Diesel Generator (DG) from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 14 days Branch Technical Position (BTP) 8-8 LAR supported by Probabilistic Risk Assessment (PRA)
CNS and MNS are implementing ESPS modifications (i.e., two supplemental DGs at each site)
Capacity to bring affected unit to Cold Shutdown (i.e., MODE 5) conditions Capable of powering any of the 4160 kV essential buses (on either unit) during a Station Blackout (SBO) within one hour CNS and MNS TS Changes include:
Required Action introduced to evaluate availability of ESPS prior to entering extended CT Availability of ESPS checked once per shift when in the extended CT Completion Time introduced should ESPS become unavailable during the extended CT 8
LAR Overview - Proposed Change #2 Current CNS/MNS TS Bases requirement for OPERABILITY of shared components is to have an OPERABLE normal and emergency power source available Propose to remove the TS Bases requirement for shared components to have both an OPERABLE normal and emergency power source Propose to update CNS/MNS TS 3.8.1, AC Sources - Operating to add new LCOs for one required opposite unit offsite circuit and one required opposite unit DG for each required shared component Precedent for TS treatment of opposite unit power sources supporting shared components:
North Anna ITS Conversion (ADAMS Accession Nos. ML003780732 and ML010430193)
NRC Safety Evaluation (ADAMS Accession No. ML021200265)
CNS/MNS TS Section 1.1 definition of OPERABLE/OPERABILITY is to have normal or emergency power 9
PRA Overview PRA Includes: Internal Events, Internal Flooding, External Events, High Winds and Fire All Completed Peer Reviews Against ANS/ASME PRA Standard and RG 1.200 R2 Seismic and External Flooding have Bounding / Qualitative Assessments 10
PRA Overview (McGuire)
Preliminary Results of EDG Completion Time Extension from 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to 14 Days (McGuire)
Risk Metric Risk Metric Results Unit 1 Unit 2 Total CDF 4.97E-05 6.14E-05 Total CDF -1.07E-05 -1.14E-05 Total LERF 4.61E-06 4.87E-06 Total LERF -1.91E-06 -1.32E-06 Total ICCDP 6.59E-07 5.59E-07 Total ICLERP 8.73E-09 4.45E-08 11 11
PRA Overview (McGuire)
McGuire Internal Events (Including LERF and Internal Flooding)
Internal Events Peer Review June 2015 LERF Peer Review December 2012, follow on June 2015 Internal Flooding Peer Review September 2011, follow on June 2015 Internal Events Independent Closure Review January 2016 All Supporting Requirements Reviewed Resolved Findings to Capability Category (CC) II except for 5 Findings 2 Internal Flooding 3 Internal Events 8 LERF SRs at CCI 12 12
PRA Overview (Catawba)
Catawba Internal Events (Including LERF and Internal Flooding)
Internal Events Peer Review December 2015 LERF Peer Review December 2012, Follow on December 2015 Internal Flooding Peer Review September 2012, Follow on December 2015 All Supporting Requirements Reviewed Resolved Findings to Capability Category (CC) II except for 46 Findings 41 Internal Events Model Issues 5 LERF SRs at CCI 13 13
PRA Overview (McGuire)
McGuire External Events High Winds Peer Review Peer Review October 2014 All Supporting Requirements Reviewed Resolved Findings to Capability Category (CC) II except for 8 Findings External Flooding Qualitative Assessment Seismic Conservative Bounding Assessment 14 14
PRA Overview (Catawba)
Catawba External Events High Winds Peer Review Peer Review August 2013 All Supporting Requirements Reviewed Resolved Findings to Capability Category (CC) II except for 5 Findings External Flooding Qualitative Assessment Seismic Conservative Bounding Assessment 15 15
PRA Overview (Catawba and McGuire)
Fire PRA Peer Reviewed Model Used for NFPA 805 Application 16 16
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