ML073241108
| ML073241108 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 12/12/2007 |
| From: | Vaaler M NRC/NRR/ADRO/DORL/LPLII-2 |
| To: | Duncan R Carolina Power & Light Co |
| Vaaler, Marlayna, NRR/DORL 415-3178 | |
| References | |
| TAC MD5385 | |
| Download: ML073241108 (5) | |
Text
December 12, 2007 Robert J. Duncan II, Vice President Shearon Harris Nuclear Power Plant Carolina Power & Light Company Post Office Box 165, Mail Code: Zone 1 New Hill, North Carolina 27562-0165
SUBJECT:
SHEARON HARRIS NUCLEAR POWER PLANT, UNIT 1 - REVIEW OF THE SPRING 2006 REFUELING OUTAGE 13 STEAM GENERATOR TUBE INSPECTION REPORTS (TAC NO. MD5385)
Dear Mr. Duncan:
By letter dated May 5, 2006, Carolina Power & Light Company (the licensee), now doing business as Progress Energy Carolinas, Inc. (PEC), submitted the steam generator (SG) tube plugging report for Refueling Outage (RFO) 13 for the Shearon Harris Nuclear Power Plant, Unit 1 (HNP), in accordance with Technical Specification (TS) Section 4.4.5.5.a. By letter dated April 20, 2007, the licensee submitted the 12-month SG tube inservice inspection report for RFO-13 in accordance with TS Section 4.4.5.5.b. Additional information regarding the SG tube inspections was provided in an inservice inspection report dated August 10, 2006, a licensee letter dated September 27, 2007, and a conference call held on October 25, 2007.
As discussed in the enclosed evaluation, the NRC staff has completed its review of the above documents and has concluded that PEC provided the information required by the HNP TSs. In addition, the staff did not identify any technical issues that warrant follow up action at this time.
If you have any questions regarding this matter, please contact me at (301) 415-3178.
Sincerely,
/RA/
Marlayna Vaaler, Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-400
Enclosure:
As stated cc w/enclosure: See next page
Robert J. Duncan II, Vice President December 12, 2007 Shearon Harris Nuclear Power Plant Carolina Power & Light Company Post Office Box 165, Mail Code: Zone 1 New Hill, North Carolina 27562-0165
SUBJECT:
SHEARON HARRIS NUCLEAR POWER PLANT, UNIT 1 - REVIEW OF THE SPRING 2006 REFUELING OUTAGE 13 STEAM GENERATOR TUBE INSPECTION REPORTS (TAC NO. MD5385)
Dear Mr. Duncan:
By letter dated May 5, 2006, Carolina Power & Light Company (the licensee), now doing business as Progress Energy Carolinas, Inc. (PEC), submitted the steam generator (SG) tube plugging report for Refueling Outage (RFO) 13 for the Shearon Harris Nuclear Power Plant, Unit 1 (HNP), in accordance with Technical Specification (TS) Section 4.4.5.5.a. By letter dated April 20, 2007, the licensee submitted the 12-month SG tube inservice inspection report for RFO-13 in accordance with TS Section 4.4.5.5.b. Additional information regarding the SG tube inspections was provided in an inservice inspection report dated August 10, 2006, a licensee letter dated September 27, 2007, and a conference call held on October 25, 2007.
As discussed in the enclosed evaluation, the NRC staff has completed its review of the above documents and has concluded that PEC provided the information required by the HNP TSs. In addition, the staff did not identify any technical issues that warrant follow up action at this time.
If you have any questions regarding this matter, please contact me at (301) 415-3178.
Sincerely,
/RA/
Marlayna Vaaler, Project Manager Plant Licensing Branch II-2 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-400
Enclosure:
As stated cc w/enclosure: See next page DISTRIBUTION:
PUBLIC LPL2-2 R/F RidsNrrPMMVaaler RidsNrrLACSola RidsNrrDorlLpl2-2 RidsNrrDciCsgb RidsOgcRp RidsAcrsAcnwMailCenter RidsRgn2MailCenter (RMusser) KKarwoski LMiller ADAMS Accession Number: ML073241108 NRR-106 OFFICE LPL2-2/PM LPL2-2/LA CSGB/BC LPL2-2/BC NAME MVaaler CSola AHiser* TBoyce DATE 11 / 29 /07 11 / 28 /07 10/31/2007 12 / 12 /07
- by memo OFFICIAL RECORD COPY
Mr. Robert J. Duncan II Shearon Harris Nuclear Power Plant, Carolina Power & Light Company Unit No. 1 cc:
Mr. Kelvin Henderson Chairman of the North Carolina Plant General Manager Utilities Commission Shearon Harris Nuclear Power Plant Post Office Box 29510 Progress Energy Carolinas, Inc. Raleigh, North Carolina 27626-0510 P. O. Box 165, Mail Zone 3 New Hill, North Carolina 27562-0165 Public Service Commission State of South Carolina Mr. Chris L. Burton Post Office Drawer 11649 Director of Site Operations Columbia, South Carolina 29211 Shearon Harris Nuclear Power Plant Progress Energy Carolinas, Inc. Ms. Beverly Hall, Section Chief Post Office Box 165, Mail Zone 1 Division of Radiation Protection New Hill, North Carolina 27562-0165 N.C. Department of Environment and Natural Resources Mr. David H. Corlett, Supervisor 3825 Barrett Drive Licensing/Regulatory Programs Raleigh, North Carolina 27609-7721 Shearon Harris Nuclear Power Plant Progress Energy Carolinas, Inc. Mr. Robert P. Gruber P. O. Box 165, Mail Zone 1 Executive Director New Hill, NC 27562-0165 Public Staff NCUC 4326 Mail Service Center Mr. Thomas J. Natale, Manager Raleigh, North Carolina 27699-4326 Support Services Shearon Harris Nuclear Power Plant Ms. Margaret A. Force Progress Energy Carolinas, Inc. Assistant Attorney General P. O. Box 165, Mail Zone 1 State of North Carolina New Hill, North Carolina 27562-0165 Post Office Box 629 Raleigh, North Carolina 27602 Resident Inspector / Harris NPS c/o U. S. Nuclear Regulatory Commission Mr. Tony Gurley, Chair 5421 Shearon Harris Road Board of County Commissioners New Hill, North Carolina 27562-9998 of Wake County P. O. Box 550 Mr. J. Paul Fulford Raleigh, North Carolina 27602 Manager, Performance Evaluation and Regulatory Affairs PEB 5 Mr. Carl Thompson, Chair Progress Energy Carolinas, Inc. Board of County Commissioners Post Office Box 1551 of Chatham County Raleigh, North Carolina 27602-1551 P. O. Box 87 Pittsboro, North Carolina 27312 David T. Conley Associate General Counsel II - Mr. John H. ONeill, Jr.
Legal Department Pillsbury Winthrop Shaw Pittman, LLP Progress Energy Service Company, LLC 2300 N Street NW.
Post Office Box 1551 Washington, DC 20037-1128 Raleigh, North Carolina 27602-1551
EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION CAROLINA POWER AND LIGHT COMPANY STEAM GENERATOR TUBE INSPECTION REPORTS FOR THE SPRING 2006 OUTAGE SHEARON HARRIS NUCLEAR POWER PLANT, UNIT NO. 1 DOCKET NO. 50-400
1.0 INTRODUCTION
By letter dated May 5, 2006 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML061360488), Carolina Power & Light Company (the licensee), now doing business as Progress Energy Carolinas, Inc. (PEC), submitted the steam generator (SG) tube plugging report for Refueling Outage (RFO) 13 for the Shearon Harris Nuclear Power Plant, Unit 1 (HNP), in accordance with Technical Specification (TS) Section 4.4.5.5.a. By letter dated April 20, 2007 (ADAMS Accession No. ML071160122), the licensee submitted the 12-month SG tube inservice inspection report for RFO-13 in accordance with TS Section 4.4.5.5.b. Additional information regarding the SG tube inspections was provided in an inservice inspection report dated August 10, 2006 (ADAMS Accession No. ML062300078), a licensee letter dated September 27, 2007 (ADAMS Accession No. ML072770007), and a conference call held on October 25, 2007 (ADAMS Accession No. ML073241044).
2.0 BACKGROUND
HNP has three Westinghouse model Delta 75 SGs, which were placed into service in 2001 during RFO 10. Each SG has 6,307 thermally treated Alloy 690 tubes which have an outside diameter of 0.688 inches and a nominal wall thickness of 0.040 inches. The tubes were hydraulically expanded at each end for the full depth of the tubesheet. The tubes are supported by a number of stainless steel support plates which have trifoil shaped holes through which the tubes pass. Below the support plates is a flow distribution baffle which has octafoil shaped holes. The tubes in rows 1 through 17 (i.e., those with a bend radius less than 12 inches) received a supplemental thermal treatment (stress relieving) after bending.
3.0 EVALUATION The licensee provided the scope, extent, methods, and results of their SG tube inspections in the documents referenced above. The licensee also described corrective actions in the form of tube plugging and tube stabilization taken in response to the inspection findings.
Enclosure
Based on review of the information submitted by the licensee, the NRC staff has the following observations/comments:
- 1. New dents located by the 8th and 9th tube support plates were identified in two tubes on the hot-leg side and three tubes on the cold-leg side of SG C. The licensee indicated that the new dents could potentially be due to thermal transients from the colder auxiliary feedwater fluid used during startup operations. This colder auxiliary feedwater fluid was reported to have been in service slightly longer than is typical while exiting the 2004 refueling outage.
- 2. During a conference call with the licensee on October 25, 2007, the licensee confirmed that the 10 tubes in SG B with loose part signals at the hot-leg top of the tubesheet region were detected with the rotating coil. In addition, the licensee confirmed that no tube degradation was identified with the rotating coil.
- 3. The licensee indicated during a conference call on October 25, 2007, that they do not have a clear explanation for the restriction located approximately 22 inches up from the cold-leg tube end in SG B.
The licensee provided the following inspection sequence for the affected tube:
(1) attempted to pass the bobbin probe from the hot-leg side (would not pass),
(2) attempted to pass the bobbin probe from the cold-leg side (would not pass), and (3) attempted to pass a +Point' probe from the cold-leg side (would pass).
The licensee indicated that it is possible that something could have been moved during this inspection sequence; however, the probe did not detect anything nearby.
The licensee conducted a historical review of SG inspection data and reported no degradation or restriction at this area. The licensee indicated that the +Point' probe detected no degradation, no bulge, or restriction. Based on the favorable results of their
+Point' probe exam, they did not perform additional exams. The tube was left in service. The next planned SG tube eddy current inspection for the tube in question is scheduled during the Fall 2010 refueling outage.
4.0 CONCLUSION
Based on a review of the information provided, the NRC staff concludes that the licensee provided the information required by the HNP TSs. In addition, the staff concludes that there are no technical issues that warrant follow up action at this time since the inspections appear to be consistent with the objective of detecting potential tube degradation, and the inspection results appear to be consistent with industry operating experience at similarly designed and operated units.
Principal Contributor: Leslie Miller Date: December 12, 2007