ML18157A032
| ML18157A032 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 06/06/2018 |
| From: | Michael Mahoney Plant Licensing Branch II |
| To: | Simril T Duke Energy Carolinas |
| Mahoney M | |
| References | |
| Download: ML18157A032 (18) | |
Text
Proposed Removal of Catawbas Containment Valve Injection Water System (NW) from Specified Containment Isolation Valves (CIVs)
June 11, 2018
Duke Energy Attendees Cecil Fletcher (Catawba Regulatory Affairs Manager)
Carrie Wilson (Catawba Regulatory Affairs Senior Engineer)
Lee Keller (Catawba Engineering General Manager)
Mandi Brigman (Catawba Engineering Manager)
Bob Pryce (Catawba Principal Engineer)
Douglas Brunson (Catawba Engineer III) 2 2
Agenda Introductions / Opening Remarks Containment Valve Injection Water System (NW or CVIWS) System - Purpose and Sketch Planned License Amendment Request (LAR) to Change Catawbas Updated Final Safety Analysis Report (UFSAR) Section 6.2.4.2.2, Containment Valve Injection Water System and Table 6-77, Containment Isolation Valve Data UFSAR Change - Purpose, Precedent, Overview, and Subsequent Actions Other System Sketches Revised UFSAR Section 6.2.4.2.2 Revised TSB 3.6.17, Containment Valve Injection Water System (CVIWS) 3
Containment Valve Injection Water System (NW or CVIWS) Purpose Containment Valve Injection Water System:
The Containment Valve Injection Water System (NW or CVIWS) is designed to provide a water seal to a specific class of containment isolation valves (gate valves) during a LOCA to prevent leakage of containment atmosphere through the gate valves.
The NW penetration valves are not required to be Type C tested.
The NW system is designed to meet all Regulatory and Testing requirements set forth in 10 CFR 50, Appendix J and ASME Code Section IX.
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Containment Valve Injection Water System (NW or CVIWS) Sketch - 1(2) A Train 5 5 Legend:
For Information Only Highlighted -
Proposed CIVs for NW isolation RN - Nuclear Service Water System YM - Demineralized Water System
Containment Valve Injection Water System (NW or CVIWS) Sketch - 1(2) B Train 6 6 Legend:
For Information Only Highlighted -
Proposed CIVs for NW isolation Legend:
For Information Only Highlighted -
Proposed CIVs for NW isolation RN - Nuclear Service Water System YM - Demineralized Water System
Planned LAR to Change Catawbas UFSAR Section 6.2.4.2.2, Containment Valve Injection Water System and Table 6-77, Containment Isolation Valve Data 7
Overview 7
Containment Valve Injection Water System (NW or CVIWS) UFSAR Change Purpose of Requested UFSAR Change:
Isolation of Containment Valve Injection Water System (NW) Supply from Safety Injection (NI) and Containment Spray (NS) Containment Isolation Valves (CIVs) and exclude the CIVs from Type-C Local Leak Rate Testing (LLRT).
Improve NW System reliability 8 8
Containment Valve Injection Water System (NW or CVIWS) UFSAR Change Precedent of Requested UFSAR Change:
Request to exempt from LLRT using a closed system outside containment submitted by VC Summer on October 12, 2011 for HHSI CIVs (ML11286A318) and Comanche Peak on March 18, 2003 for RHR and Containment Spray CIVs. (ML030860407)
Based on information submitted, the NRC granted the exception based on closed loop outside of containment and issued a SER on March 5, 2004 for Comanche Peak (ML040690358) and a SER on July 9, 2012 for VC Summer. (ML12184A135) 9 9
Containment Valve Injection Water System (NW or CVIWS) UFSAR Change 10 Overview of Requested UFSAR Change:
This will be a Permanent Change to Catawbas UFSAR
Proposal is to revise UFSAR Section 6.2.4.2.2, Containment Valve Injection Water System to remove the reference to specific solenoid valves that supply seal water to valves closing on an SP signal. These solenoid valves are for the NI and NS containment isolation valves receiving seal water injection. UFSAR Table 6-77, Containment Isolation Valve Data will also be modified to remove the NW System designator for LRT type for the associated CIVs.
The subject CIVs are currently NW Leak Rate Tested consistent with the original licensing basis which was under 10 CFR 50, Appendix J, prior to availability of Option B.
The proposed LAR submittal will be deterministic.
Submittal is based on the affected valves not constituting a potential primary containment atmospheric pathway during and following a Loss of Coolant Accident (LOCA) and an acceptable program in place to monitor and reduce leakage from those portions of systems outside containment to ensure these systems will maintain containment isolation functions.
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Containment Valve Injection Water System (NW or CVIWS) UFSAR Change Subsequent Actions of Requested UFSAR Change:
Planned Modifications Future Inspections Future Maintenance Activities 11 11
Safety Injection System (NI) Sketch 12 12 Legend:
For Information Only FWST - Refueling Water (FW) Storage Tank Highlighted -
Proposed CIVs for NW isolation Gray Lines -
Containment penetration reference
Emergency Core Cooling System (ECCS) Sketch 13 13 Legend:
For Information Only FWST - Refueling Water (FW) Storage Tank Highlighted -
Proposed CIVs for NW isolation Gray Lines -
Containment penetration reference
Containment Spray System (NS) Sketch 14 14 Legend:
For Information Only FWST - Refueling Water (FW) Storage Tank Highlighted -
Proposed CIVs for NW isolation Gray Lines -
Containment penetration reference
Revised UFSAR Section 6.2.4.2.2 15 Proposal:
Revise UFSAR Section 6.2.4.2.2, Containment Valve Injection Water System to remove the reference to specific solenoid valves that supply seal water to valves closing on an SP signal.
These solenoid valves are for the NI and NS containment isolation valves receiving seal water injection.
Revise associated pages of UFSAR Table 6-77, Containment Isolation Valve Data.
TSB 3.6.17 Change - Alignment 16 16 Proposal:
Revise TSB 3.6.17, Containment Valve Injection Water System (CVIWS) for alignment with proposed UFSAR changes.
PRA Overview (Catawba and McGuire)
Questions?
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