ML102350170: Difference between revisions
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| issue date = 09/15/2010 | | issue date = 09/15/2010 | ||
| title = Review of the Results of 16th Steam Generator Tube Inservice Inspections Performed During Refueling Outage 17 | | title = Review of the Results of 16th Steam Generator Tube Inservice Inspections Performed During Refueling Outage 17 | ||
| author name = Singal B | | author name = Singal B | ||
| author affiliation = NRC/NRR/DORL/LPLIV | | author affiliation = NRC/NRR/DORL/LPLIV | ||
| addressee name = Sunseri M | | addressee name = Sunseri M | ||
| addressee affiliation = Wolf Creek Nuclear Operating Corp | | addressee affiliation = Wolf Creek Nuclear Operating Corp | ||
| docket = 05000482 | | docket = 05000482 | ||
| Line 21: | Line 21: | ||
==Dear Mr. Sunseri:== | ==Dear Mr. Sunseri:== | ||
By letter dated April 8, 2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. | By letter dated April 8, 2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML101100676), as supplemented by letter dated July 15, 2010 (ADAMS Accession No. ML102080031), Wolf Creek Nuclear Operating Corporation (the licensee) submitted information summarizing the results of the 16th steam generator tube inservice inspections at the Wolf Creek Generating Station (WCGS), performed during Refueling Outage 17. The U.S. Nuclear Regulatory Commission (NRC) staff has completed its review of these reports and concludes that the licensee provided the information required by WCGS Technical Specifications and that no additional follow-up is required at this time. The results of the NRC staff's review of the report submitted by the licensee are summarized in the enclosure to this letter. Please contact me at 301-415-3016 with any questions. | ||
Sincerely, R t\.0 C\ '-'.-f L& | Sincerely, R t\.0 C\ '-'.-f L& | ||
K. Singal, Senior Projec1' Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-482 Enclosure As stated cc w/encl: Distribution via Listserv OFFICE OF NUCLEAR REACTOR REGULATION REVIEW OF THE RESULTS OF THE 16TH STEAM GENERATOR TUBE INSERVICE INSPECTIONS PERFORMED DURING 17TH REFUELING OUTAGE WOLF CREEK NUCLEAR OPERATING CORPORATION WOLF CREEK GENERATING STATION DOCKET NO. 50-482 By letter dated April 8,2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. | K. Singal, Senior Projec1' Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-482 Enclosure As stated cc w/encl: Distribution via Listserv OFFICE OF NUCLEAR REACTOR REGULATION REVIEW OF THE RESULTS OF THE 16TH STEAM GENERATOR TUBE INSERVICE INSPECTIONS PERFORMED DURING 17TH REFUELING OUTAGE WOLF CREEK NUCLEAR OPERATING CORPORATION WOLF CREEK GENERATING STATION DOCKET NO. 50-482 By letter dated April 8,2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML101100676), as supplemented by letter dated July 15, 2010 (ADAMS Accession No. ML102080031), Wolf Creek Nuclear Operating Corporation (the licensee) submitted information summarizing the results of the 16th steam generator (SG) tube inservice inspections at the Wolf Creek Generating Station (WCGS), performed during Refueling Outage 17. WCGS has four Westinghouse Model F SGs. Each SG contains 5,626 thermally-treated Alloy 600 tubes. Each tUbe has an outside diameter of 0.688 inches and a wall thickness of 0.040 inches. The tubes are supported by stainless steel tube supports with quatrefoil-shaped holes and V-shaped chrome-plated Alloy 600 anti-vibration bars. The licensee provided the scope, extent, methods, and results of its SG tube inspections in the documents referenced above. In addition, the licensee described corrective actions, such as tube plugging, taken in response to the inspection findings. | ||
After reviewing the information provided by the licensee, the U.S. Nuclear Regulatory Commission (NRC) staff has the following comments or observations: The licensee has previously identified 31 tubes in SG A, 11 tubes in SG B, 10 tubes in SG C, and 7 tubes in SG D that are considered tubes with potentially elevated residual stress. The dents, dings, and expansion transitions in these tubes are not preferentially examined with a rotating probe. The NRC staff notes that several licensees do preferentially sample these locations since they may be more prone to cracking. The licensee does not appear to inspect all new dents and dings with a rotating probe when they are discovered. | After reviewing the information provided by the licensee, the U.S. Nuclear Regulatory Commission (NRC) staff has the following comments or observations: The licensee has previously identified 31 tubes in SG A, 11 tubes in SG B, 10 tubes in SG C, and 7 tubes in SG D that are considered tubes with potentially elevated residual stress. The dents, dings, and expansion transitions in these tubes are not preferentially examined with a rotating probe. The NRC staff notes that several licensees do preferentially sample these locations since they may be more prone to cracking. The licensee does not appear to inspect all new dents and dings with a rotating probe when they are discovered. | ||
However, the licensee is maintaining the tube integrity. | However, the licensee is maintaining the tube integrity. | ||
| Line 36: | Line 36: | ||
==Dear Mr. Sunseri:== | ==Dear Mr. Sunseri:== | ||
By letter dated April 8, 2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. | By letter dated April 8, 2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML101100676), as supplemented by letter dated July 15, 2010 (ADAMS Accession No. ML102080031), Wolf Creek Nuclear Operating Corporation (the licensee) submitted information summarizing the results of the 16th steam generator tube inservice inspections at the Wolf Creek Generating Station (WCGS), performed during Refueling Outage 17. The U.S. Nuclear Regulatory Commission (NRC) staff has completed its review of these reports and concludes that the licensee provided the information required by WCGS Technical Specifications and that no additional follow-up is required at this time. The results of the NRC staffs review of the report submitted by the licensee are summarized in the enclosure to this letter. Please contact me at 301-415-3016 with any questions. | ||
Sincerely, IRN Balwant K. Singal, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-482 Enclosure As stated cc w/encl: Distribution via Listserv DISTRIBUTION: | Sincerely, IRN Balwant K. Singal, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-482 Enclosure As stated cc w/encl: Distribution via Listserv DISTRIBUTION: | ||
PUBLIC RidsNrrPMWolfCreek Resource LPLIV rtf RidsNrrLA.lBurkhardt Resource RidsAcrsAcnw_MailCTR Resource RidsOgcRp Resource RidsNrrDorlLpl4 Resource RidsRgn4MailCenter Resource ADAMS Accession No'" | PUBLIC RidsNrrPMWolfCreek Resource LPLIV rtf RidsNrrLA.lBurkhardt Resource RidsAcrsAcnw_MailCTR Resource RidsOgcRp Resource RidsNrrDorlLpl4 Resource RidsRgn4MailCenter Resource ADAMS Accession No'" ML102350170 OFFICE NRR/LPL4/PM NRR/LPL4/LA NRR/LPL4/BC NRR/LPL4/PM NAME BSingal JBurkhardt MMarkley BSingal DATE 9/13/10 9/10/10 9/15/10 9/15/10 OFFICIAL RECORD COpy}} | ||
Revision as of 04:54, 11 July 2019
| ML102350170 | |
| Person / Time | |
|---|---|
| Site: | Wolf Creek  |
| Issue date: | 09/15/2010 |
| From: | Balwant Singal Plant Licensing Branch IV |
| To: | Matthew Sunseri Wolf Creek |
| Singal, Balwant, 415-3016, NRR/DORL/LPL4 | |
| References | |
| TAC ME3774 | |
| Download: ML102350170 (4) | |
Text
UNITED NUCLEAR REGULATORY WASHINGTON, D.C. 20555-0001 September 15, 2010 Mr. Matthew W. Sunseri President and Chief Executive Officer Wolf Creek Nuclear Operating Corporation Post Office Box 411 Burlington, KS 66839 WOLF CREEK GENERATING STATION -REVIEW OF THE RESULTS OF THE 16TH STEAM GENERATOR TUBE INSERVICE INSPECTIONS PERFORMED DURING REFUELING OUTAGE 17 (TAC NO. ME3774)
Dear Mr. Sunseri:
By letter dated April 8, 2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML101100676), as supplemented by letter dated July 15, 2010 (ADAMS Accession No. ML102080031), Wolf Creek Nuclear Operating Corporation (the licensee) submitted information summarizing the results of the 16th steam generator tube inservice inspections at the Wolf Creek Generating Station (WCGS), performed during Refueling Outage 17. The U.S. Nuclear Regulatory Commission (NRC) staff has completed its review of these reports and concludes that the licensee provided the information required by WCGS Technical Specifications and that no additional follow-up is required at this time. The results of the NRC staff's review of the report submitted by the licensee are summarized in the enclosure to this letter. Please contact me at 301-415-3016 with any questions.
Sincerely, R t\.0 C\ '-'.-f L&
K. Singal, Senior Projec1' Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-482 Enclosure As stated cc w/encl: Distribution via Listserv OFFICE OF NUCLEAR REACTOR REGULATION REVIEW OF THE RESULTS OF THE 16TH STEAM GENERATOR TUBE INSERVICE INSPECTIONS PERFORMED DURING 17TH REFUELING OUTAGE WOLF CREEK NUCLEAR OPERATING CORPORATION WOLF CREEK GENERATING STATION DOCKET NO. 50-482 By letter dated April 8,2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML101100676), as supplemented by letter dated July 15, 2010 (ADAMS Accession No. ML102080031), Wolf Creek Nuclear Operating Corporation (the licensee) submitted information summarizing the results of the 16th steam generator (SG) tube inservice inspections at the Wolf Creek Generating Station (WCGS), performed during Refueling Outage 17. WCGS has four Westinghouse Model F SGs. Each SG contains 5,626 thermally-treated Alloy 600 tubes. Each tUbe has an outside diameter of 0.688 inches and a wall thickness of 0.040 inches. The tubes are supported by stainless steel tube supports with quatrefoil-shaped holes and V-shaped chrome-plated Alloy 600 anti-vibration bars. The licensee provided the scope, extent, methods, and results of its SG tube inspections in the documents referenced above. In addition, the licensee described corrective actions, such as tube plugging, taken in response to the inspection findings.
After reviewing the information provided by the licensee, the U.S. Nuclear Regulatory Commission (NRC) staff has the following comments or observations: The licensee has previously identified 31 tubes in SG A, 11 tubes in SG B, 10 tubes in SG C, and 7 tubes in SG D that are considered tubes with potentially elevated residual stress. The dents, dings, and expansion transitions in these tubes are not preferentially examined with a rotating probe. The NRC staff notes that several licensees do preferentially sample these locations since they may be more prone to cracking. The licensee does not appear to inspect all new dents and dings with a rotating probe when they are discovered.
However, the licensee is maintaining the tube integrity.
The NRC staff notes that several licensees inspect new dents and dings with a rotating probe to ensure degradation is not occurring at these locations (before placing these dents and dings in the general population of dents and dings). Enclosure
-2Degradation has been observed at a few J-nozzle-to-feedwater ring interface locations.
The licensee stated that periodic visual inspections and ultrasonic measurements are performed at these locations and all results have met the acceptance criteria.
No other degradation has been observed during the secondary side inspections.
Based on a review of the information provided, the NRC staff concludes that the licensee provided the information required by the technical specifications.
In addition, the NRC staff concludes that there are no technical issues that warrant follow-up actions 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:
Aloysius O. Obodoako, NRR/DCI/CSGB September 15, 2010 Mr. Matthew W. Sunseri President and Chief Executive Officer Wolf Creek Nuclear Operating Corporation Post Office Box 411 Burlington, KS 66839 WOLF CREEK GENERATING STATION -REVIEW OF THE RESULTS OF THE 16TH STEAM GENERATOR TUBE INSERVICE INSPECTIONS PERFORMED DURING REFUELING OUTAGE 17 (TAC NO. ME3774)
Dear Mr. Sunseri:
By letter dated April 8, 2010 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML101100676), as supplemented by letter dated July 15, 2010 (ADAMS Accession No. ML102080031), Wolf Creek Nuclear Operating Corporation (the licensee) submitted information summarizing the results of the 16th steam generator tube inservice inspections at the Wolf Creek Generating Station (WCGS), performed during Refueling Outage 17. The U.S. Nuclear Regulatory Commission (NRC) staff has completed its review of these reports and concludes that the licensee provided the information required by WCGS Technical Specifications and that no additional follow-up is required at this time. The results of the NRC staffs review of the report submitted by the licensee are summarized in the enclosure to this letter. Please contact me at 301-415-3016 with any questions.
Sincerely, IRN Balwant K. Singal, Senior Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-482 Enclosure As stated cc w/encl: Distribution via Listserv DISTRIBUTION:
PUBLIC RidsNrrPMWolfCreek Resource LPLIV rtf RidsNrrLA.lBurkhardt Resource RidsAcrsAcnw_MailCTR Resource RidsOgcRp Resource RidsNrrDorlLpl4 Resource RidsRgn4MailCenter Resource ADAMS Accession No'" ML102350170 OFFICE NRR/LPL4/PM NRR/LPL4/LA NRR/LPL4/BC NRR/LPL4/PM NAME BSingal JBurkhardt MMarkley BSingal DATE 9/13/10 9/10/10 9/15/10 9/15/10 OFFICIAL RECORD COpy