ULNRC-06266, Response to Request for Additional Information, Third 10-Year Interval Inservice Inspection, Request for Relief No. 13R-11

Response to Request for Additional Information, Third 10-Year Interval Inservice Inspection, Request for Relief No. 13R-11

ML15328A243
Person / Time
Site:	Callaway
Issue date:	11/24/2015
From:	Maglio S A Ameren Missouri, Union Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
TAC MF6736, ULNRC-06266
Download: ML15328A243 (7)

Text

2/JI11eteII Cal laway Plant MISSOURI November 24, 2015 ULNRC-06266 U.S.Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-000 1 10 CFR 50.55a Ladies and Gentlemen:

DOCKET NUMBER 50-483 CALLA WAY PLANT UNIT 1 UNION ELECTRIC CO.RENEWED FACILITY OPERATING LICENSE NPF-30 RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION THIRD 10-YEAR INTERVAL INSERVICE INSPECTION REQUEST FOR RELIEF NO.13R-11 (TAC NUMBER MF6736)By letter dated September 14, 2015 (ADAMS Accession Number ML1525$A432), and pursuant to 10 CFR 50, Section 50.55a(g)(5)(iii), Union Electric Company (Ameren Missouri)requested relief from the requirements of the ASME Code,Section XI, in regard to certain weld examinations performed during the third 10-year interval for the inservice inspection (ISI)Program at Callaway Plant.Four specific relief requests were submitted for the third 10-year ISI interval, for which the code of record was the 1998 Edition, through the 2000 Addenda of ASME Code,Section XI.In particular, per Relief Request 13R-11, relief was requested from the Code required"essentially 100 percent"volumetric examination coverage requirements applicable to the Pressurizer nozzle-to-vessel welds, ASME Section XI Category B-D, Item No.B3.1 10.During its review of Relief Request 13R-11, the NRC staff determined that requests for additional information (RATs)were needed to complete its review of the relief request.Pursuant to electronic correspondence dated November 3, 2015, the NRC transmitted a list of RATs to Ameren Missouri in electronic form on November 12, 2015, and requested that responses be provided within 29 days.The responses to the RATs are provided in the Attachment to this letter.P0 Box 620 Fulton, rvlO 65251: ArnerenrvlissourLconi STARS Alliance ULNRC-06266 November 24, 2015 Page 2 This letter contains no new commitments.

If there are any questions, please contact Tom Elwood at 314-225-1905.

Sincerely,£4 S.A.Magli Manager, Regulatory Affairs JPK/

Attachment:

Response to Request for Additional Information

-Third 10-Year Interval Inservice Inspection Request for Relief No.13R-1 1 ULNRC-06266 November 24, 2015 Page 3 cc: Mr.Marc L.Dapas Regional Administrator U.S.Nuclear Regulatory Commission Region IV 1600 East Lamar Boulevard Arlington, IX 7601 1-4511 Senior Resident Inspector Callaway Resident Office U.S.Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr.L.John Klos Project Manager, Callaway Plant Office of Nuclear Reactor Regulation U.S.Nuclear Regulatory Commission Mail Stop 08H4 Washington, DC 20555-0001 ULNRC-06266 November 24, 2015 Page 4 Index and send hardcopy to QA File A160.0761 Hardcopy: Certrec Corporation 6100 Western Place, Suite 1050 fort Worth, TX 76107 (Certrec receives ALL attachments as long as they are non-safeguards and may be publicly disclosed.)

Electronic distribution for the following can be made via Other Situations ULNRC Distribution:

F.M.Diya D.W.Neterer L.H.Graessle T.E.Herrmann B.L.Cox S.A.Maglio I.B.Elwood M.G.Hoebn Corporate Communications NSRB Secretary STARS Regulatory Affairs Mr.John O'Neill (Pillsbury Winthrop Shaw Pittman LLP)Missouri Public Service Commission Attachment to ULNRC-06266 Response to Request for Additional Information Third 10-Year Interval Inservice Inspection Request for Relief No.13R-11 2 Pages Attachment to ULNRC-06266 Page 1 REQUEST FOR ADDITIONAL INFORMATION THIRD JO-YEAR INTERVAL INSERVICE INSPECTION REQUEST FOR RELIEF NO.13R-IJ UNION ELECTRIC COMPANY CALLAWAY PLANT, UNIT I DOCKET NO.50-48 1.0 SCOPE By letter dated September 14, 2015 (Agencywide Documents Access and Management System (ADAMS)at Accession Number ML15258A432), Union Electric Company (dba Ameren Missouri), the licensee, requested relief from the requirements of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code (ASME BPV Code), Section Xl, for Callaway Plant, Unit 1 (Callaway) under the provisions of Title 10 of the Code of Federal Regulations (10 CFR), Part 50, Section 50.55a(g)(5)(iii), for the third 10-year inservice inspection (ISI)Program.Request for Relief (RR)No.13R-1 I applies to the third 10-year 151 interval, in which the licensee adopted the 1998 Edition, through the 2000 Addenda of ASME Code,Section XI as the code of record.2..0 REGULATORY BASIS 2.1 10 CFR 50.55a(g),"Inservice Inspection Requirements,"

requires, in part, that Class 1, 2 and 3 piping, components and their supports, as well as metal and concrete containment components and their supports, meet the requirements of Section XI,"Rules for Inservice Inspection of Nuclear Power Plant Components,"

of the ASME BPV Code or equivalent quality standards.

10 CFR 50.55a states the requirements governing the use of Code Cases, as amended by Regulatory Guide 1.147, Revision 17,"Inservice Inspection Code Case Acceptability, ASME Section XI, Division 1,"which accepts ASME Code Case N-460,"Alternative Examination Coverage for Class 1 and Class 2 Welds."The code case provides clarification that the stated requirement for examination of essentially 100 percent of the weld length means greater than 90 percent coverage of the examination volume, or surface area, as applicable.

3.0 REQUEST

FOR ADDITIONAL INFORMATION 3.1 For RR 13R-1 1, please identify the non-destructive examination procedure used in the subject ultrasonic examinations (e.g., ASME Code,Section XI, Appendix VIII;or Section V, Article 4;or other).Response: The examination was performed in accordance with ASME Section V Article 4, as supplemented by Section XI Table 1-2000-1.(Reference Section XI Article 1-2400.)

Attachment to ULNRC-06266 Page 2 3.2 Please state the material of construction of the Pressurizer (PZR)nozzles contained in the table in RR 13R-11.Response: The Pressurizer nozzle material is nominal 3"carbon steel with.25"SS ID clad.3.3 The ilcensee's enclosed inspection reports states that 0, 45, and 60 degree angles were used in the examinations of the subject PZR nozzles-to-vessel welds.Please fully clarify the wave modality and insonification angles used for each of the ultrasonic examinations of the PZR nozzle-to-vessel welds contained in RR 13R-7 1.Response: To the extent practical, a 0-degree longitudinal wave examination was performed on the accessible examination volume.Also, 45-&60-degree shear wave examinations were performed in two directions axial to the weld and in two directions parallel to the weld on the available examination volume.