ML082210012
| ML082210012 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 08/07/2008 |
| From: | Christian D Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 08-0413 | |
| Download: ML082210012 (5) | |
Text
VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 August 7, 2008 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Serial No.
NL&OS/ETS Docket Nos.
License Nos.
08-0413 RO 50-338/339 NPF-4/7 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
NORTH ANNA POWER STATION UNITS 1 AND 2 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION PROPOSED LICENSE AMENDMENT REQUEST LCO 3.8.7 AND 3.8.9 - SHARED COMPONENTS In a letter dated October 24,2007 (Serial No. 07-0630), Dominion requested amendments, In the form of changes to the Technical Specifications to Facility Operating License Numbers NPF-4 and NPF-7 for North Anna Power Station Units 1 and 2, respectively. The proposed amendments would revise LCO 3.8.7 and LCO 3.8.9 to support shared component operability on the opposite unit.
In a July 9, 2008 letter the NRC requested additional information to complete the review of the proposed amendments.
The requested information is provided in the attachment to this letter.
The information provided in this letter does not affect the conclusion of the significant hazards consideration discussion provided in the October 24, 2007 Dominion letter (Serial No. 07-0630).
If you have any questions or require additional information, please contact Mr. Thomas Shaub at (804) 273-2763.
Very truly yours, i'~JJcO--
David A. Christian President and Chief Nuclear Officer COMMONWEALTH OF VIRGINIA
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COUNTY OF HENRICO
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VICKI L. HUll Notafy PublIc Commonwealth of VIIgInIa CommIIIlon......
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Notary Public
~.IC£..<.f+'-......._' 2008.
Acknowledged before me this 2!!' day of TJJ//~'//c.
My Commission Expires:,....:....JeL.L...,~=4-..;--I-"""-""'-<-L-'-
The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by David A Christian, who is President and Chief Nuclear Officer, of Virginia Electric and Power Company. 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.
Serial No.08-413 Docket Nos. 50-338/339 Shared Components Page 2 of 2 Attachment Response to Request for Additional Information - Proposed License Amendment Request LCO 3.8.7 and 3.8.9 - Shared Components Commitments made in this letter: None.
cc:
U.S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, SW Suite 23T85 Atlanta, Georgia 30303 Mr. J. E. Reasor, Jr.
Old Dominion Electric Cooperative Innsbrook Corporate Center 4201 Dominion Blvd.
Suite 300 Glen Allen, Virginia 23060 State Health Commissioner Virginia Department of Health James Madison Building - i h floor 109 Governor Street Suite 730 Richmond, Virginia 23218 NRC Senior Resident Inspector North Anna Power Station Mr. S. P. Lingam NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North MaiI Stop 0-8 G9A 11555 Rockville Pike Rockville, Maryland 20852
Serial No.08-413 Docket Nos. 50-338/339 Attachment Response to Request for Additional Information Proposed License Amendment Request LCO 3.8.7 and 3.8.9 - Shared Components North Anna Power Station Units 1 And 2 Virginia Electric and Power Company (Dominion)
Serial No.08-413 Docket Nos. 50-338/339 RAI Response - Shared Components Page 1 of 2 Response to Request for Additional Information Proposed License Amendment Request LCO 3.8.7 and 3.8.9 - Shared Components In a letter dated October 24, 2007 (Serial No. 07-0630),
Dominion requested amendments, in the form of changes to the Technical Specifications to Facility Operating License Numbers NPF-4 and NPF-7 for North Anna Power Station Units 1 and 2, respectively.
The proposed amendments would revise LCD 3.8.7 and LCD 3.8.9 to support shared component operability on the opposite unit. In a July 9, 2008 letter the NRC requested the following additional information to complete the review of the proposed amendments.
NRC QUESTION 1 "In the proposed Technical Specifications (TS), Limiting Condition of Operation (LCD) 3.8.7, Action B, it is stated that in case: One or more inverters required by LCD 3.8.7.b inoperable, Declare associated shared components inoperable.
Provide the following information related to the above statement (preferably in the tabular form):
- a. Specific Inverter(s) out.
- b. Specific associated component(s) inoperable.
- c. Describe how this component becomes inoperable. Provide reference drawing number from where this information can be verified, if necessary.
- d. Provide the associated system which becomes inoperable due to the associated component(s) being inoperable. Provide the associated system LCD."
NRC QUESTION 2 "In the proposed TS, LCD 3.8.9, Action F, it is stated that in case: One or more required LCD 3.8.9.b AC vital electrical power distribution subsystem(s) inoperable, Declare associated shared components inoperable.
Provide the following information related to the above statement (preferably in the tabular form):
- a. Specific AC vital electrical power distribution subsystem(s).
- b. Specific associated component(s) inoperable.
- c. Describe how this component becomes inoperable.
Provide reference drawing number from where this information can be verified, if necessary.
- d. Provide the associated system which becomes inoperable due to the associated component(s) being inoperable. Provide the associated system LCD."
Serial No.08-413 Docket Nos. 50-338/339 RAI Response - Shared Components Page 2 of 2 DOMINION RESPONSE
Background
There are four independent 120V ac vital distribution systems per unit. Each system is powered from a respective 125V dc panel through a static inverter. Each 120V ac vital distribution panel is normally powered from its respective static inverter. For periods of static inverter maintenance, a transfer switch is provided for each vital bus.
The following table identifies the Unit 1 and 2 inverters and the components powered by that inverter that are necessary for operability of the Emergency Core Cooling System (ECCS) Pump Room Exhaust Air Cleanup System (PREACS).
Applicable to TS changes LCO 3.8.7 Action Band 3.8.9 Action F Specific Specific associated How component is System declared Inverter or shared component INOPERABLE and INOPERABLE and Vital Bus reference drawings.
associated system LeO Unit 1 -
SOV-HV-103-1A and 18 Loss of power to one Emergency Core Cooling Inverter 1-1 train of SOVs prevents System (ECCS) Pump operation of Air Room Exhaust Air Cleanup Operated Dampers System (PREACS), LCO AOD-HV-103-1/2/3/4 3.7.12 Action A entered.
for Aux Building Central Exhaust Reference Drawings:
I 11715-ESK-6NW I
11715-F8-006A II Unit 2 -
SOV-HV-103-2A and 2B Loss of power to one Emergency Core Cooling Inverter 2-111 train of SOVs prevents System (ECCS) Pump operation of Air Room Exhaust Air Cleanup Operated Dampers System (PREACS), LCO AOD-HV-103-1/2/3/4 3.7.12 Action A entered.
for Aux Building Central Exhaust Reference Drawings:
11715-ESK-6NX 11715-FB-006A