ML080650570
| ML080650570 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 03/24/2008 |
| From: | Mahesh Chawla NRC/NRR/ADRO/DORL/LPLIII-1 |
| To: | Entergy Nuclear Operations |
| Saba F, NRR/DORL/LPL4, 301-415-1447 | |
| References | |
| TAC MD5391 | |
| Download: ML080650570 (5) | |
Text
March 24, 2008 Vice President, Operations Entergy Nuclear Operations Palisades Nuclear Plant 27780 Blue Star Memorial Highway Covert, MD 49043-9530
SUBJECT:
PALISADES PLANT - REVIEW OF THE STEAM GENERATOR TUBE INSERVICE INSPECTION REPORT FOR THE PALISADES NUCLEAR PLANT REFUELING OUTAGE IN 2006 (TAC NO. MD5391)
Dear Sir or Madam:
By letters dated April 26, 2006 (Agencywide Document Access and Management System (ADAMS) Accession No. ML061160510), April 11, 2007 (ADAMS Accession No. ML071090247), and June 19, 2007 (ADAMS Accession No. ML071780216), Entergy Nuclear Operations, Inc. (the licensee) submitted steam generator (SG) tube inspection results from the 2006 inspections at the Palisades Nuclear Plant. The licensee also provided information regarding the SG inspections in a letter dated November 20, 2007 (ADAMS Accession No. ML073241330). Additionally, the U.S. Nuclear Regulatory Commission (NRC) staff summarized three conference calls held with the licensee, concerning the 2006 SG tube inspections, in a letter dated September 22, 2006 (ADAMS Accession No. ML062560069).
The NRC staff has completed its review of these reports and concludes that the licensee provided the information required by their technical specifications and that no additional follow up is required at this time. The staffs review of the reports is enclosed.
If you have any questions regarding this matter, please contact me at (301) 415-8371.
Sincerely,
/RA/
Mahesh L. Chawla, Project Manager Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-255
Enclosure:
Review of SG Inspection Reports cc w/encl: See next page
ML071090247), and June 19, 2007 (ADAMS Accession No. ML071780216), Entergy Nuclear Operations, Inc. (the licensee) submitted steam generator (SG) tube inspection results from the 2006 inspections at the Palisades Nuclear Plant. The licensee also provided information regarding the SG inspections in a letter dated November 20, 2007 (ADAMS Accession No. ML073241330). Additionally, the U.S. Nuclear Regulatory Commission (NRC) staff summarized three conference calls held with the licensee, concerning the 2006 SG tube inspections, in a letter dated September 22, 2006 (ADAMS Accession No. ML062560069).
The NRC staff has completed its review of these reports and concludes that the licensee provided the information required by their technical specifications and that no additional follow up is required at this time. The staffs review of the reports is enclosed.
If you have any questions regarding this matter, please contact me at (301) 415-8371.
Sincerely,
/RA/
Mahesh L. Chawla, Project Manager Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-255
Enclosure:
Review of SG Inspection Reports cc w/encl: See next page DISTRIBUTION PUBLIC LPL3-1 r/f RidsNrrDorlLpl3-1 RidsNrrPMMChawla RidsNrrLATHarris AHiser KKarwoski RidsRgn3MailCenter RidsOgcRp RidsAcrsAcnw&mMailCenter Adams Accession: ML080650570 Memo from A. Hiser to P. Milano OFFICE LPL3-1/PM LPL3-1/LA CSGB/BC*
LPL3-1/BC NAME MChawla THarris AHiser LJames DATE 03 / 21 /08 03 / 21 /08 02/ 28 /2008 03 / 24 /08
Palisades Plant cc:
Supervisor Covert Township P. O. Box 35 Covert, MI 49043 Office of the Governor P. O. Box 30013 Lansing, MI 48909 U.S. Nuclear Regulatory Commission Resident Inspector's Office Palisades Plant 27782 Blue Star Memorial Highway Covert, MI 49043 Michigan Department of Environmental Quality Waste and Hazardous Materials Division Hazardous Waste and Radiological Protection Section Nuclear Facilities Unit Constitution Hall, Lower-Level North 525 West Allegan Street P.O. Box 30241 Lansing, MI 48909-7741 Michigan Department of Attorney General Special Litigation Division 525 West Ottawa St.
Sixth Floor, G. Mennen Williams Building Lansing, MI 48913 Mr. William DiProfio 48 Bear Hill Road Newton, NH 03858 Mr. William T. Russell 400 Plantation Lane Stevensville, MD 21666 Mr. Gary Randolph1750 Ben Franklin Drive, 7E Senior Vice President Entergy Nuclear Operations P. O. Box 31995 Jackson, MS 39286-1995 Vice President Oversight Entergy Nuclear Operations P. O. Box 31995 Jackson, MS 39286-1995 Senior Manager, Nuclear Safety
& Licensing Entergy Nuclear Operations P. O. Box 31995 Jackson, MS 39286-1995 Senior Vice President and COO Entergy Nuclear Operations 440 Hamilton Avenue White Plains, NY 10601 Assistant General Counsel Entergy Nuclear Operations 440 Hamilton Avenue White Plains, NY 10601 Manager, Licensing Entergy Nuclear Operations Palisades Nuclear Plant 27780 Blue Star Memorial Highway Covert, MI 49043-9530
REVIEW OF THE 2006 STEAM GENERATOR TUBE INSERVICE INSPECTION REPORTS RENEWED FACILITY OPERATING LICENSE NO. DPR-20 ENTERGY NUCLEAR OPERATIONS, INC.
PALISADES NUCLEAR PLANT DOCKET NO. 50-255 By letters dated April 26, 2006 (Agencywide Document Access and Management System (ADAMS) Accession No. ML061160510), April 11, 2007 (Accession No. ML071090247), and June 19, 2007 (Accession No. ML071780216), Entergy Nuclear Operations, Inc. (the licensee) submitted steam generator (SG) tube inspection results from the 2006 inspections at the Palisades Nuclear Plant. The licensee also provided information regarding the SG inspections in a letter dated November 20, 2007 (Accession No. ML073241330). Additionally, the U.S.
Nuclear Regulatory Commission (NRC) staff summarized three conference calls held with the licensee, concerning the 2006 SG tube inspections, in a letter dated September 22, 2006 (Accession No. ML062560069).
Palisades Nuclear Plant has two Combustion Engineering Model 2530 replacement SGs. Each SG has 8,219 mill-annealed, Alloy 600 tubes. The tubes have an outside diameter of 0.75 inches, and a wall thickness of 0.042 inches. Stainless steel, eggcrate, lattice-type tube supports, diagonal straps, and vertical straps support the tubes at various locations. The tubes were expanded through the full depth of the tubesheet using an explosive process.
The licensee provided the scope, extent, methods, and results of their SG tube inspections in the documents referenced above. In addition, the licensee described corrective actions (e.g.,
tube plugging) taken in response to the inspection findings.
After review of the information provided by the licensee, the NRC staff has the following comments/observations:
The licensee left parts in service, but the parts are small (i.e., present no threat to tube integrity) or have been tracked for several cycles with no evidence of tube wear.
The licensee has concluded circumferential outside diameter stress corrosion cracking (ODSCC) at dents and dings is non-relevant since conditions conducive to circumferential ODSCC are not present in the Palisades SGs. Also, axial and circumferential primary water stress corrosion cracking at dents and dings greater than five volts is non-relevant, since the support structures are fabricated from stainless steel, and thus cannot experience denting in the classical sense (i.e., due to carbon steel corrosion resulting in magnetite formation sufficient to deform the tube).
Based on a review of the information provided by the licensee, the staff concludes that the licensee provided the information required by their technical specifications. The SG tube inspections at Palisades Nuclear Plant 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: Andrew B. Johnson, DCI/CSGB Date: March 24, 2008