ML063610325
| ML063610325 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 12/28/2006 |
| From: | Siva Lingam NRC/NRR/ADRO/DORL/LPLII-1 |
| To: | Christian D Virginia Electric & Power Co (VEPCO) |
| Lingam, Siva NRR/DORL 415-1564 | |
| References | |
| TAC MD3168, TAC MD3169 | |
| Download: ML063610325 (5) | |
Text
December 28, 2006 Mr. David A. Christian Senior Vice President and Chief Nuclear Officer Virginia Electric and Power Company Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711
SUBJECT:
SURRY POWER STATION, UNIT NOS. 1 AND 2, REQUEST FOR ADDITIONAL INFORMATION (RAI) REGARDING THE PROPOSAL TO REVISE TECHNICAL SPECIFICATION SURVEILLANCE REQUIREMENTS FOR THE INSPECTION OF THE CONTAINMENT RECIRCULATION SUMP (TAC NOS. MD3168 AND MD3169)
Dear Mr. Christian:
By letter dated October 3, 2006, Virginia Electric and Power Company (the licensee), submitted a license amendment request regarding the revision of the Technical Specification (TS)
Surveillance Requirements (SR), for the inspection of the containment recirculation sump. The proposed license amendment will revise the TS SR to: (1) change the required frequency of containment sump inspections, and (2) replace specific terminology associated with the existing sump screen design with generic terminology applicable to both the existing design and the replacement strainer being installed in response to the Nuclear Regulatory Commissions (NRCs) Generic Letter 2004-02, Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at Pressurized-Water Reactors. The NRC staff is reviewing the submittal and has determined that additional information is required to complete its evaluation.
The NRC staffs RAI is enclosed. The licensee is requested to provide a response to the RAI within 30 days.
Sincerely,
/RA/
Siva P. Lingam, Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket Nos. 50-280 and 50-281
Enclosure:
RAI cc w/encl: See next page
ML063610325 NRR-088 OFFICE NRR/LPL2-1/PM NRR/LPD2-1/LA NRR/DSS/SSIB/BC NRR/LPL2-1/BC NAME SLingam MOBrien MScott EMarinos DATE 12/27/06 12/27/06 12/21/06 12/28/06
Enclosure REQUEST FOR ADDITIONAL INFORMATION REGARDING REVISION OF TECHNICAL SPECIFICATION SURVEILLANCE REQUIREMENTS AMENDMENT ASSOCIATED WITH CONTAINMENT SUMP SURRY POWER STATION, UNIT NOS. 1 AND 2 DOCKET NOS. 50-280 AND 50-281 1.
The language in the proposed Technical Specifications (TSs) 4.5.D and 4.11.C.5.c and their associated TS Basis discussions does not clearly identify the scope of these surveillance requirements. Specific components are referenced in the existing TSs 4.5.D and 4.11.C.5.c (i.e., pump wells, engineered safeguards suction inlets, containment sump, trash racks, and screens). The proposed TS change would replace these specific references with generic wording (i.e., containment sump components).
The applicable TS Basis descriptions would also be modified to include the generic phrase containment sump components, without identifying the specific components within the scope of the surveillance.
The Nuclear Regulatory Commission (NRC) staff considers it essential that the proposed TS surveillance requirements 4.5.D and 4.11.C.5.c and/or the associated TS Basis descriptions identify the specific components that are within the scope of the surveillance inspection to provide a clear and inspectable requirement. Please provide additional description within proposed TSs 4.5.D and 4.11.C.5.c and/or the associated TS Basis discussions to address the NRC staffs concern, or else provide justification for the adequacy of the generic wording of the proposed TS requirements and basis discussions in light of the discussion above.
2.
Please identify the scope of the proposed containment sump suction inlet periodic inspection required by TS 4.5.D, including a list of the components and/or structures covered by the inspections for potential debris restrictions, structural distress, and abnormal corrosion.
If the proposed requirement involves a reduction in the scope of the current surveillance inspection, then justification should also be provided to support the proposed reduction in inspection scope.
3.
Please identify the scope of the proposed containment sump suction inlet periodic inspection required by TS 4.11.C.5.c, including a list of the components and/or structures covered by the inspections for potential debris restrictions, structural distress, and abnormal corrosion.
If the proposed requirement involves a reduction in the scope of the current surveillance inspection, then justification should also be provided to support the proposed reduction
in inspection scope.
- 4.
The submittal states that, with one subsequent modification, the current containment sump surveillance requirements (i.e., TSs 4.5.D and 4.11.C.5.c ) were implemented following the identification of debris in the sump and of degraded conditions associated with the sump that are documented in Licensee Event Report (LER) 88-017-01, dated November 7, 1988. However, the submittal does not provide an indication of whether the historical results of the current sump inspections support a reduction in frequency (i.e., deletion of the requirement for performing the inspection following major maintenance activities in containment). Therefore, the NRC staff requests additional information concerning the results of past containment sump inspections performed after the completion of clean up and modification activities associated with LER 88-017-01. Specifically, the NRC staff requests a description of the types and quantities of debris or foreign materials that have been found in the containment sumps and the presumed means by which the debris or foreign materials entered sumps.
5.
The TS Basis discussion for TS 4.5 indicates that flow tests are performed for the internal recirculation spray pumps through the installation of a temporary dike and physical modifications to the pump discharge piping. Please describe whether this flow test has previously resulted in debris entering the containment sumps and what level of verification is/will be performed following this test to ensure that no debris is present downstream of the screens/replacement strainers.
6.
The NRC staff noted that the potential for dynamic effects associated with the strainer replacement modification was not specifically addressed in the submittal. In particular, the submittal noted that the trash rack will be removed and that the replacement strainer will be installed on the containment floor around the existing containment sump pit. The NRC staff seeks reasonable assurance that these planned modifications have been adequately evaluated with respect to the dynamic effects of a piping rupture, including jet impingement, whipping pipes, and missile impacts. Please provide additional justification to demonstrate that the proposed strainer modification satisfies NRC requirements with respect to dynamic effects.
Surry Power Station, Units 1 & 2 cc:
Mr. David A. Christian Senior Vice President and Chief Nuclear Officer Virginia Electrical and Power Company Innsbrook Technical Center 5000 Dominion Boulevard Glen Allen, VA 23060-6711 Ms. Lillian M. Cuoco, Esq.
Senior Counsel Dominion Resources Services, Inc.
Building 475, 5th Floor Rope Ferry Road Waterford, Connecticut 06385 Mr. Donald E. Jernigan Site Vice President Surry Power Station Virginia Electric and Power Company 5570 Hog Island Road Surry, Virginia 23883-0315 Senior Resident Inspector Surry Power Station U. S. Nuclear Regulatory Commission 5850 Hog Island Road Surry, Virginia 23883 Chairman Board of Supervisors of Surry County Surry County Courthouse Surry, Virginia 23683 Dr. W. T. Lough Virginia State Corporation Commission Division of Energy Regulation Post Office Box 1197 Richmond, Virginia 23218 Dr. Robert B. Stroube, MD, MPH State Health Commissioner Office of the Commissioner Virginia Department of Health Post Office Box 2448 Richmond, Virginia 23218 Office of the Attorney General Commonwealth of Virginia 900 East Main Street Richmond, Virginia 23219 Mr. Chris L. Funderburk, Director Nuclear Licensing & Operations Support Dominion Resources Services, Inc.
Innsbrook Technical Center 5000 Dominion Blvd.
Glen Allen, Virginia 23060-6711