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Line 3: |
Line 3: |
| | issue date = 05/31/2006 | | | issue date = 05/31/2006 |
| | title = Relief, Third 10-Year ISI Interval | | | title = Relief, Third 10-Year ISI Interval |
| | author name = Monarque S R | | | author name = Monarque S |
| | author affiliation = NRC/NRR/ADRO/DORL | | | author affiliation = NRC/NRR/ADRO/DORL |
| | addressee name = Christian D A | | | addressee name = Christian D |
| | addressee affiliation = Virginia Electric & Power Co (VEPCO) | | | addressee affiliation = Virginia Electric & Power Co (VEPCO) |
| | docket = 05000280 | | | docket = 05000280 |
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[Table view] |
Text
May 31, 2006Mr. 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 NO. 1 (SURRY 1 ) - CORRECTION TORELIEF REQUESTS PRT-07 AND PRT-08 (TAC NOS. MC6690 AND MC6707)
Dear Mr. Christian:
On March 28, 2006, the Nuclear Regulatory Commission (NRC) issued Relief RequestsPRT-07 and PRT-08 for Surry 1. These reliefs were in response to your application dated April 11, 2005. By letter dated April 27, 2006, you informed the NRC that the safety evaluations (SEs) for bothrelief requests contained a discrepancy. Your letter stated that these SEs provided the datesfor the third 10-year inservice inspection interval (ISI) at Surry 2, instead of the dates for the third 10-year ISI at Surry 1. The corrected pages for these SEs are enclosed with this letter.
The revisions to the SEs are identified by lines in the margin.Sincerely,/RA/Stephen R. Monarque, Project Manager Plant Licensing Branch II-1 Division of Operating Reactor Licensing Office of Nuclear Reactor RegulationDocket No. 50-280
Enclosure:
Safety Evaluation cc w/encl: See next page
ML061510365 NRR-028OFFICENRR/LPL2-1/PMNRR/LPL2-1/LANRR/LPL2-1/BCNAMESMonarque:srmMO'BrienEMarinos DATE5/17/065/18/065/26/06 listed therein. The ASME Code of record for the Surry 1 ISI program is the 1989 edition ofASME Code,Section XI. The licensee requested relief for the third 10-year ISI interval at Surry 1, which began on October 14, 1993, and ended on December 31, 2004.
l
3.0TECHNICAL EVALUATION
3.1ASME Code,Section XI Requirement The 1989 edition of ASME Code,Section XI, Article IWB-2500 requires that components beexamined and tested as specified in Table IWB-2500-1. Table IWB-2500-1, examination category B-A, item number B1.11 requires a volumetric examination of the RV circumferential shell welds once each 10-year ISI interval with essentially 100-percent volumetric coverage of the examination volume cross section specified in Figure IWB-2500-1 of ASME Code,Section XI, for essentially 100-percent of the weld length.3.2Component for Which Relief is RequestedCategory Item Description B-A B1.11 RV Circumferential Shell WeldsThe licensee has specifically requested relief for Circumferential Shell Weld 1-04 at Surry 1. This weld adjoins the RV shell with the lower vessel head.3.3Licensee's Basis for Relief Request The ultrasonic examination of the reactor pressure vessel circumferential shellweld is conducted in accordance with techniques qualified by demonstration for Appendix VIII, Supplements 4 and 6 of the 1995-96 Addenda of ASME [Code],Section XI.There are four core support lugs located at 0 degree, 90 degree, 180 degree,and 270 degree [azimuth] positions [at] the vessel inside surface just above the
[circumferential shell] weld which restrict[s] complete coverage of the required examination volume. The ultrasonic examination of this weld was performed by scanning the accessible scan surfaces between the support lugs and below the support lugs. Figure 1 [in the licensee's submittal] shows the general configuration of the reactor vessel and location of weld 1-04. Figures 2 and 3 [in the licensee's submittal] show the ultrasonic scanning boundaries for this weld with the restrictions due to the core support lugs. The size of the ultrasonic manipulator end effector limits how close the individual transducers can be positioned to the support lugs while scanning. The proximity of the end effector to the support lugs limits the amount of coverage obtained with each of the qualified transducers. Table 1 [in the licensee's submittal] provides the breakdown of percent [of] coverage of the required examination volume by scan direction and transducer. The achieved coverage of the required examinationvolume applying the qualified techniques is 73.4 [percent]. Relief Request PRT-08 lMay 26, 2006 l subject to the limitations and modifications listed therein. The ASME Code of record for theSurry 1 ISI program is the 1989 edition of ASME Code,Section XI. The licensee requested relief for the third 10-year ISI interval at Surry 1, which began on October 14, 1993, and ended lon December 31, 2004.
l
3.0TECHNICAL EVALUATION
3.1ASME Code,Section XI Requirement The 1989 edition of ASME Code,Section XI, Article IWB-2500, requires that components beexamined and tested as specified in Table IWB-2500-1. Table IWB-2500-1, examination category B-A, Item Number B1.30, requires a volumetric examination of the RV shell-to-flange weld once each 10-year ISI interval, with essentially 100-percent volumetric coverage of the examination volume specified in Figure IWB-2500-4 of ASME Code,Section XI.3.2Component for Which Relief is Requested Category Item Description B-A B1.30 RV Shell-to-Flange Weld 3.3Licensee's Basis for Relief Request The ultrasonic examination of the reactor vessel shell-to-flange weld wasperformed using a combination of manual and remote automated ultrasonic examination techniques. The manual examination was applied from the flange surface with techniques in accordance with the requirements of ASME Section V, Article 4. The remote automated ultrasonic examinations were performed from the vessel shell inside surface using techniques qualified by demonstration for Appendix VIII, Supplements 4 and 6 of the 1995-1996 Addenda of ASME Section XI as allowed by approved relief request SR-030 (NRC letter datedOctober 16, 2004). These automated techniques are noted to produce more accurate, reliable and repeatable procedures of examinations than the standard
[ASME Code] Section V techniques previously used.Figure 1 [of the licensee's submittal] shows the reactor vessel and associatedwelds. Figures 2 and 3 [of the licensee's submittal] illustrate the weld profile andshow scan orientation and directions. Coverage of the examination volume is obtained by combining the manual examination performed from the flange surface with the automated coverage obtained from the vessel shell surface. The examination performed from the flange surface provides examination coverage with the ultrasonic sound beam directed essentially normal to the weld axis. Coverage from the flange provides coverage of the examination volume in one beam direction, perpendicular to the weld axis. The ASME Section XI, Appendix VIII, Supplements 4 and 6 techniques are applied from the vesselinside surface, scanning in four directions to the extent possible. Due to the surface geometry of the flange, the ability to scan the necessary areas to providecomplete coverage of the examination volume in four directions is limited. The examination tool end effector, which holds the ultrasonic transducers, is not able to maintain the necessary surface contact on the non-parallel surface of theRelief Request PRT-07 lMay 26, 2006 l
Surry Power Station, Units 1 & 2 cc:Ms. Lillian M. Cuoco, Esq.Senior Counsel Dominion Resources Services, Inc.
Building 475, 5th Floor Rope Ferry Road Waterford, Connecticut 06385Mr. Donald E. JerniganSite Vice President Surry Power Station Virginia Electric and Power Company 5570 Hog Island Road Surry, Virginia 23883-0315Senior Resident InspectorSurry Power Station U. S. Nuclear Regulatory Commission 5850 Hog Island Road Surry, Virginia 23883ChairmanBoard of Supervisors of Surry County Surry County Courthouse Surry, Virginia 23683Dr. W. T. LoughVirginia State Corporation Commission Division of Energy Regulation Post Office Box 1197 Richmond, Virginia 23218Dr. Robert B. Stroube, MD, MPHState Health Commissioner Office of the Commissioner Virginia Department of Health Post Office Box 2448 Richmond, Virginia 23218Office of the Attorney GeneralCommonwealth of Virginia 900 East Main Street Richmond, Virginia 23219Mr. Chris L. Funderburk, DirectorNuclear Licensing & Operations Support Dominion Resources Services, Inc.
Innsbrook Technical Center 5000 Dominion Blvd.
Glen Allen, Virginia 23060-6711