ML15289A555
| ML15289A555 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 10/26/2015 |
| From: | Geoffrey Miller Plant Licensing Branch II |
| To: | Capps S Duke Energy Carolinas |
| Miller G | |
| References | |
| CAC MF2983, CAC MF2984 | |
| Download: ML15289A555 (4) | |
Text
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Mr. Steven D. Capps Vice President McGuire Nuclear Station Duke Energy Carolinas, LLC 12700 Hagers Ferry Road Huntersville, NC 28078-8985
SUBJECT:
MCGUIRE NUCLEAR STATION, UNITS 1 AND 2: REQUEST FOR ADDITIONAL INFORMATION REGARDING LICENSE AMENDMENT REQUEST NUCLEAR SERVICE WATER SYSTEM ALLOWED OUTAGE TIME EXTENSION (CAC NOS. MF2983 AND MF2984)
Dear Mr. Capps:
By letter dated June 30, 2015 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML15191A025), Duke Energy Carolinas, LLC (Duke) submitted a license amendment request, which' requested to modify selected Technical Specification Completion Times to support repair activity associated with the Nuclear Service Water System, Train 'A'. By letter dated September 24, 2015 (ADAMS Accession No. ML15275A155), Duke submitted a response to a request for additional information (RAI).
The U.S. Nuclear Regulatory Commission staff has reviewed the licensee's supplement and determined that additional information is needed in order to complete our review. The enclosed document describes this RAI.' This information request was discussed with Duke staff on October 8, 2015.
If you have any questions, please call me at 301-415-2481.
Docket Nos. 50-369 and 50-370
Enclosure:
. Request for Additional Information cc w/encl: Distribution via Listserv Sin~e{:,}
c~Miftl G. Edward Miller, Project Manager Plant Licensing Branch 11-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation
REQUEST FOR ADDITIONAL INFORMATION MCGUIRE NUCLEAR STATION, UNITS 1 AND 2 RELATED TO A LICENSE AMENDMENT REQUEST SUPPORTING CORRECTION OF A NUCLEAR SERVICE WATER SYSTEM DEGRADED CONDITION DUKE ENERGY CAROLINAS, LLC DOCKET NOS. 50-369 AND 50-370 By letter' dated June 30, 2015 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML15191A025), Duke Energy Carolinas, LLC (Duke Energy) submitted a license amendment request (LAR) to temporarily change McGuire Nuclear Station (MNS), Units 1 and 2, Technical Specifications (TSs) for correction of a degraded condition affecting the 'A' Train of the nuclear service water system (NSWS). The requested amendment would temporarily change the following TSs to allow the inoperability of the 'A' Train of the NSWS for a total of up to 14 days: TS 3.5.2, Emergency_ Core Cooling System (ECCS) -
Operating; TS 3.6.6, Containment Spray System (CSS); TS 3.7.5, Auxiliary Feedwater (AFW)
System; TS 3.7.6, Component Cooling Water (CCW) System; TS 3.7.7,, Nuclear Service Water System (NSWS); TS 3.7.9, Control Room Area Ventilation System (CRAVS); TS 3.7.11, Auxiliary Building Filtered Ventilation Exhaust System (ABFVES), and TS 3.8.1, AC Sources-Operating. The 'A' Train of the shared NSWS would be inoperable while the safety-related supply from the MNS Nuclear Service Water Pond was drained and isolated to correct a degraded condition affecting that line. By letter dated September 24, 2015, (ADAMS Accession No. ML15275A155), Duke submitted a response to a request for additional information.
Based on the NRC staff's review of the September 24, 2015 response, the NRC staff has determined the following additional information is necessary to support completion of its technical review:
SBPB-RAl-003 The LAR includes the potential activity to install a piping penetration in the drained section of the NSWS within the auxiliary building if required for personnel access to remove suspected blockage. In SBPB-RAl-001, the U.S. Nuclear Regulatory Commission (NRC) staff requested additional information on how using the single valve ORN-7A for isolation was consistent with defense-in-depth. Duke's response to SBPB-RAl-001 discussed administrative controls that would be used to maintain the valve in the closed position and the leakage rate into the area around valve ORN-7 A that has been evaluated as acceptable. Although the tag out process and other administrative controls would provide some level of assurance that the valve would remain closed, the NRC staff requests Duke provide additional discussion of measures that would limit the potential for significant leakage past valve ORN-7A and measures that could be taken to remediate significant leakage. This discussion should include the following:
Potential for development of significant leakage (e.g., qualification of valves for isolation function, operating experience with water-hammer following flow interruption, and Enclosure potential for inadvertent valve operation to cause leakage in excess of evaluated limits for internal flooding)
Likelihood of successful remediation (e.g., conditions allowing re-closure of valve ORN-7 A and independence of other measures to isolate flow through ORN-7 A, such as closure of valve ORN-12A)
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ML15275A155), Duke submitted a response to a request for additional information (RAI).
The U.S. Nuclear Regulatory Commission staff has reviewed the licensee's supplement and determined that additional information is needed in order to complete our review. The enclosed document describes this RAI. This information request was discussed with Duke staff on October 8, 2015.
If you have any questions, please call me at 301-415-2481.
Docket Nos. 50-369 and 50-370
Enclosure:
Request for Additional Information cc w/encl: Distribution via Listserv DISTRIBUTION:
Public RidsACRS_MailCTR Resource RidsNrrDeEicb Resource RidsNrrLASFigueroa Resource ADAMS Accession No. ML15289A555 LPL2-1 R/F Sincerely,
/RA/
G. Edward Miller, Project Manager Plant Licensing Branch 11-1 Division of Operating -Reactor Licensing Office of Nuclear Reactor Regulation RidsNrrDorllpl2-1 Resource RidsNrrPMMcGuireResource (hard copy)
RidsRgn2MailCenter Resource
- via e-mail OFFICE NRR/LPL2-1/PM NRR/LPL2-1/LA N RR/DE/SBPB/BC NRR/LPL2-1/BC NAME GEMiller DATE 10/21/15 SFigueroa GCasto*
10/21/15 10/07/15