ML083090065
| ML083090065 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 11/03/2008 |
| From: | Price J Virginia Electric & Power Co (VEPCO) |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| 08-0013E, GL-08-001 | |
| Download: ML083090065 (3) | |
Text
VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261 November 3, 2008 U. S. Nuclear Regulatory Commission Attention: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738 Serial No.
NLOS/GDM Docket Nos.
License Nos.
08-0013E RO 50-280/281 DPR-32/37 VIRGINIA ELECTRIC AND POWER COMPANY (DOMINION)
SURRY POWER STATION UNITS 1 AND 2 CORRECTION TO NINE-MONTH RESPONSE TO NRC GENERIC LETTER 2008-01, MANAGING GAS ACCUMULATION IN EMERGENCY CORE COOLING, DECAY HEAT REMOVAL, AND CONTAINMENT SPRAY SYSTEMS On January 11, 2008, the Nuclear Regulatory Commission (NRC) issued Generic Letter (GL) 2008-01, Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems.
The GL requested each licensee to evaluate the licensing basis, design, testing, and corrective action programs for the Emergency Core Cooling System (ECCS), Residual Heat Removal (RHR) System, and Containment Spray (CS) System to ensure that gas accumulation is maintained less than the amount that could challenge operability of these systems, and that appropriate action be taken when conditions adverse to quality are identified.
By letter dated October 14, 2008 (Serial No. 08-0013B), Dominion provided its nine-month response for Surry and North Anna Power Stations. Attachment 1 to that letter provided the response for Surry. In Section A.1 of the Surry response, Dominion noted that we had reviewed the Surry license basis to determine which documents address the management of gas accumulation in the ECCS, CS and RHR systems.
The response noted that the Basis sections for TS 3.5 and TS 4.5 and Section 6.3.1.5.2, Recirculation Spray Subsystem, of the Surry Updated Final Safety Analysis Report (UFSAR) discussed gas accumulation. The response concluded that the Surry TS and UFSAR do not sufficiently document the bases and surveillance requirements needed for the ECCS to remediate potential gas accumulation.
Subsequent to the submittal of the nine-month response to GL 2008-01 for Surry, Dominion identified an additional UFSAR section that discusses gas accumulation.
Specifically, UFSAR Section 6.2.2.2.6, Vent Valves, notes the following:
6.2.2.2.6 Vent Valves High point vents have been installed at critical points in the suction lines of the charging (HHSI) pumps, and the discharge lines of the LHSI pumps where gasses could collect during plant operation. These vents have been installed to
Serial No. 08-0013E Docket Nos. 50-280/281 Page 2 of 3 allow venting during operations to minimize the possibility of gas binding of the HHSI pumps.
These vents are also used to reduce the potential for pressure surges, which may challenge the thermal relief valves upon LHSI pump starts.
Following maintenance, the vents can be used to ensure the piping is adequately filled.
Consequently, Surry UFSAR Section 6.2.2.2.6 should have been included in the nine-month response with the three licensing basis documents noted above as part of the consideration of the existing license base regarding gas accumulation.
- However, identification of the additional UFSAR section does not change the conclusion stated in the Surry nine-month response regarding the need to revise the Surry UFSAR to more thoroughly address the disposition of gas accumulation in the ECCS.
The required UFSAR revision is being prepared consistent with the commitment included in the Surry nine-month response.
If you have any questions or require additional information, please contact Gary D. Miller at (804) 273-2771.
Sincerely,
~<af\\-
J. AI~n Price Vic~President - Nuclear Engineering Commitments made in this letter: None COMMONWEALTH OF VIRGINIA
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COUNTY OF HENRICO
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The foregoing document was acknowledged before me, in and for the County and Commonwealth aforesaid, today by J. Alan Price, who is Vice President -
Nuclear Engineering 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.
3 rd
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Acknowledged before me this day of7l/)/lr.,n7 (.,).tM
,2008.
My Commission Expires:
VICKI L. HUll Notorv Public Commonwealth of virginia 140542 My Commission Expires May 31. 2010
- cc:
U. S. Nuclear Regulatory Commission Region II Sam Nunn Atlanta Federal Center 61 Forsyth Street, S.W., Suite 23T85 Atlanta, GA 30303-8931 NRC Senior Resident Inspector Surry Power Station Mr. J. F. Stang, Jr.
NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North Mail Stop 08 G9A 11555 Rockville Pike Rockville, MD 20852-2738 Ms. D. N. Wright NRC Project Manager U. S. Nuclear Regulatory Commission One White Flint North Mail Stop 08 H4A 11555 Rockville Pike Rockville, MD 20852-2738 Serial No. 08-0013E Docket Nos. 50-280/281 Page 3 of 3