ML071270786
| ML071270786 | |
| Person / Time | |
|---|---|
| Site: | Millstone, Kewaunee, Surry, North Anna  |
| Issue date: | 05/07/2007 |
| From: | Gerald Bichof Dominion Energy Kewaunee, Dominion Nuclear Connecticut, Dominion Resources Services, Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, NRC/NRR/ADRO |
| References | |
| 07-0268, GL-07-001 | |
| Download: ML071270786 (9) | |
Text
Dominion Resources Services, Inc.
5000 Dominion Boulevard, Glen Allen. VA 21(16(1 Web Address: www.dom.com May 7, 2007 United States Nuclear Regulatory Commission Serial No.
07-0268 Attention: Document Control Desk NL&OS/TJS R2 1 1 555 Rockville Pike Docket Nos. 50-280, 281 Rockville, MD 20852 50-338, 339 50-336, 423 50-305 License Nos. DPR-32, 37 NPF-4, 7 DPR-65 N P F-49 DPR-43 VIRGINIA ELECTRIC AND POWER COMPANY DOMINION NUCLEAR CONNECTICUT. INC, DOMINION ENERGY KEWAUNEE, INC.
SURRY POWER STATION UNITS 1 AND 2 NORTH ANNA POWER STATION UNITS 1 AND 2 MILLSTONE POWER STATION UNITS 2 A h l m KEWAUNEE POWER STATION RESPONSE TO GENERIC LETTER 2007-01. INACCESSIBLE OR UNDERGROUND POWER CABLE FAILURES THAT DISABLE ACCIDENT MITIGATION SYSTEMS OR CAUSE PLANT TRANSIENTS In accordance with 10 CFR 50.54(f), Virginia Electric and Power Company, Dominion Nuclear Connecticut, Inc. and Dominion Energy Kewaunee, Inc. (collectively, Dominion) are providing the attached response to NRC Generic Letter 2007-01, Inaccessible or Underground Power Cable Failures that Disable Accident Mitigation Systems or Cause Plant Transients, issued February 7, 2007. provides the requested information for GL 2007-01, Question 1, concerning Dominion's fleet history with regards to inaccessible or underground power cable failures. provides the requested information for GL 2007-01, Question 2, concerning Dominion's fleet inspection, testing, and monitoring programs to detect degradation of inaccessible or underground power cables.
Serial No. 07-0268 Docket Nos. 50-2801281, 3381339, 3361423, 305 Page 2 of 3 Please contact Mr. David A. Sommers at (804) 273-2823 if you have any questions or require additional information.
Very truly yours, i&yk6 erald T. Bischof Vice President - l d d a r Engineering Virginia Electric and Power Company Dominion Nuclear Connecticut, Inc.
Dominion Energy Kewaunee, Inc.
Attachments - Dominion Fleet Response: GL 2007-01, Question 1 - Dominion Fleet Response: GL 2007-01, Question 2 Commitments made in this letter: None cc: U. S. Nuclear Regulatory Commission Region I 475 Allendale Road King of Prussia, PA 19406-1 41 5 U. S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, S.W., Suite 23T85 Atlanta, GA 30303-8931 U. S. Nuclear Regulatory Commission Region Ill 2443 Warrenville Road, Suite 210 Lisle, I L 60532-4352 Mr. D. C. Arnett NRC Resident lnspector Surry Power Station Mr. J. T. Reece NRC Senior Resident lnspector North Anna Power Station
Serial No. 07-0268 Docket Nos. 50-2801281, 3381339, 3361423,305 Page 3 of 3 Mr. R. Prince NRC lnspector Region I 475 Allendale Road King of Prussia, PA 19406-1 41 5 Mr. S. M. Schneider NRC Senior Resident lnspector Millstone Power Station Mr. S. C. Burton NRC Senior Resident lnspector Kewaunee Power Station Mr. J. B. Hickman Project Manager - Millstone Unit 1 U. S. Nuclear Regulatory Commission Mail Stop T-7E18 Washington, DC 20555 Mr. J. D. Hughey NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North 1 1 555 Rockville Pike Mail Stop 883 Rockville, MD 20852-2738 Mr. S. P. Lingam NRC Project Manager North Anna and Surry U. S. Nuclear Regulatory Commission, Mail Stop 8 G9A One White Flint North 1 1 555 Rockville Pike Rockville, MD 20852-2738 Ms. M. H. Chernoff NRC Project Manager Kewaunee U. S. Nuclear Regulatory Commission, Mail Stop 8 G9A Washington, DC 20555
Serial No. 07-0268 Docket Nos.: 50-2801281,3381339, 3361423, 305
Subject:
GL 2007-01 COMMONWEALTH OF VIRGINIA
)
1 COUNTY OF HENRICO
)
The foregoing document was acknowledgeld before me, in and for the County and Commonwealth aforesaid, today by Gerald T'. Bischof, who is Vice President - Nuclear Engineering, of Dominion Resources Services, Inc. He has affirmed before me that he is duly authorized to execute and file the foregoing document in behalf of that Company, and that the statements in the document are true to the best of his knowledge and belief.
Acknowledged before me this 7 day of. / n / / y Z
,2007.
My Commission Expires:
d L
I Notary Public (SEAL)
Serial No. 07-0268 SURRY POWER STATION UNITS 1 AND 2 NORTH ANNA POWER STATION UNITS 1 AND 2 MILLSTONE POWER STATION UNITS 2 AND 3 KEWAUNEE POWER STATION DOMINION FLEET RESPONSE: GL 2007-01. QUESTION 1 VIRGINIA ELECTRIC AND POWER COMPANY DOMINION NUCLEAR CONNECTICUT. INC.
DOMINION ENERGY KEWAUNEE. INC.
Serial No. 07-0268 Page 1 of 2 GL 2007-01. Question 1 :
Provide a history of inaccessible or underground power cable failures for all cables that are within the scope of 10 CFR 50.65 (the Maintenance Rule) and for all voltage levels.
Indicate the type, manufacturer, date of failure, type of service, voltage class, years of service, and the root causes of the failure.
The Nuclear Energy Institute (NEI), working in conjunction with the NRC's Electrical Engineering Branch, developed guidance for licensees to use in responding to GL 2007-01 (NEI to industry letter dated 0311 6/0;7, Guidance for Response to GL 2007-01 ).
This guidance was used to compile the Dominion fleet response detailed in the following table.
Specifically, the following responses were cornpiled by searching multiple electronic databases that are currently in use as well as some older electronic databases for which the information of interest was readily available. These database searches were constructed to identify power cable failures in voltage ranges at or above 480 VAC.
Examples of the databases searched include Licensee Event Reports (LERs),
corrective action system, work orders, design change packages, engineering work requests and engineering transmittals.
Serial No. 07-0268 Page 2 of 2 Generic Letter 2007-01, Question 1 Dominion Fleet Cable Failure Summary Failed Cables
(
Failed I Cable I
Cable Type Type of Service Site/ Date of In-Producer Failure1 (In-service service Date) or Insulation Shielded Normally Equipment During Type Energized Identifier Testing (mark #)
NAPS/
0511985 1 Durina I General I EPR I
No 1
Yes I 1-SW-P-1B
( In-service testing Cable (Ethylene since 4/78 )
Propylene Rubber)
[Service Water Pump1 NAPS/
6/24/88 In-General EPR No Yes 2-SW-P-1 A
( !n-service service Cab!e
!Service water since 4/78 )
1 1
I I
I NAPS/
911 2199 In-Essex XLPE No Yes 1 -EP-ST-( In-service service (Cross-linked 1 G3 since 1981 )
Polyethylene)
[Unit Sub-station]
S PSI 10120193 (In-In-Reynolds XLPE Yes Yes 1 -EP-TX-1 G service since service
[Circ. Water 1983)
Pump Transformer]
I I
I I
I MPS No cable failures meeting search criter KPS No cable failures meeting search criter
-1 Nominal ( Root Causes of Failure Cable Voltage E
E I
1 Rating 1 Voltage 41 60V investigating low Polarization Index (PI) values for cablelmotor Presence of water in 41 60V 5kV the manholes and I
I di;z:s resi;l:ed iii the formation of water blisters Unknown Unknown 1
I i identified.
i identified.
Serial No. 07-0268 SURRY POWER STATION UNITS 1 AND 2 NORTH ANNA POWER STATION UNITS 1 AND 2 MILLSTONE POWER STATION UNITS 2 AND 3 KEWAUNEE POWER STATION DOMINION FLEET RESPONSE: GL 2007-01. QUESTION 2 VIRGINIA ELECTRIC AND POWER COMPANY DOMINION NUCLEAR CONNECTICUT. INC.
DOMINION ENERGY KEWAUNEE. INC.
Serial No. 07-0268 Page 1 of 1 GL 2007-01. Question 2:
Describe inspection, testing and monitoring programs to detect the degradation of inaccessible or underground power cables that support EDGs, offsite power, ESW, service water, component cooling water and other systems that are within the scope of 10 CFR 50.65 (the Maintenance Rule).
Cable testing within the Dominion fleet principally involves megger testing. This testing is performed either with the load remaining connected or with the load disconnected.
Surry, North Anna and Kewaunee Power Stations perform megger testing during equipment preventive maintenance for equipment and cable together and for cable after new cable pulls. Millstone performs megger testing during equipment preventive maintenance for equipment only.
Other cable testing methodologies are employed within the Dominion fleet on a less frequent basis than megger testing. These testing methods are outlined below:
Surrv and Performs DC high-potential (hi-pot) testing on the cable after new cable North Anna: pulls. Also performs polarization index (PI) testing during equipment preventive maintenance for equipment and cable together.
Millstone:
Surge capacitance testing is performed during equipment preventive maintenance for the equipment and cable together. DC high-potential (hi-pot) testing is performed for equipment and cable together after new cable pulls.