ULNRC-05542, Transmittal of Callaway, Unit 1, Additional Information Regarding 10CFR50.55a Request: Proposed Alternative to ASME Section XI Requirements for Replacement of Class 3 Buried Piping

Transmittal of Callaway, Unit 1, Additional Information Regarding 10CFR50.55a Request: Proposed Alternative to ASME Section XI Requirements for Replacement of Class 3 Buried Piping

ML082630798
Person / Time
Site:	Callaway
Issue date:	09/15/2008
From:	Graessle L AmerenUE, Union Electric Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
TAC MD6792, ULNRC-05542
Download: ML082630798 (4)

Text

AmerenUE P0 Box 620 Callaway Plant Fulton, MO 65251 September 15, 2008 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop P1-137 Washington, DC 20555-0001 ULNRC-05542 "Ae Ladies and Gentlemen:

DOCKET NUMBER 50-483 CALLAWAY PLANT UNIT 1 UNION ELECTRIC CO.

FACILITY OPERATING LICENSE NPF-30 ADDITIOANL INFORMATION REGARDING 10CFR50.55a REQUEST:

PROPOSED ALTERNATIVE TO ASME SECTION XI REQUIREMENTS FOR REPLACEMENT OF CLASS 3 BURIED PIPING - (TAC NO. MD6792)

References:

1. ULNRC-05434 dated August 30, 2007

2. ULNRC-05490 dated April 17, 2008

3. ULNRC-05517 dated July 10, 2008

4. ULNRC-05529 dated July 24, 2008 By letter dated August 30, 2007 (Reference 1 above), Union Electric Company (AmerenUE) submitted Relief Request 13R- 10 regarding paragraph IWA-4221 (b) of the American Society of Mechanical Engineers (ASME) Boiler'and Pressure Vessel Code,Section XI. The relief request, which is still under review by the NRC staff, was submitted to support the planned replacement of buried steel piping in Callaway's essential service water (ESW) system with high-density polyethylene (HDPE) piping. Subsequent to submittal of the relief request, additional letters (identified as References 2, 3 and 4 above) were submitted to provide additional or clarifying information requested by the NRC staff in regard to the request.

The additional information provided by AmerenUE included two calculations.

Specifically, in the letter of Reference 2 above, AmerenUE provided (as Enclosure 3 of that letter) a preliminary stress analysis for the new ESW piping configuration, i.e.,

Calculation 2007-16760, "Analysis of Buried HDPE ESW Piping." In the letter of Reference 3 above, AmerenUE provided (as Enclosure 4 to that letter) Calculation 2007-13241, "Minimum Wall Thickness for ESW Buried HDPE Piping," Revision 0.

AO(47 a subsidiary of Ameren Corporation

ULNRC-05542 September 15, 2008 Page 2 Per a recent telephone discussion with the NRC staff, AmerenUE was asked to provide updated versions of the calculations provided in the aforementioned letters.

Accordingly, updates of the calculations are hereby provided. Revision 1 of Calculation 2007-13241 is provided as Attachment 1, and finalized Revision 0 of Calculation 2007-1670 is provided as Attachment 2.

For questions concerning this letter or its attachments, please contact Mr. Scott Maglio at (573) 676-8719. There are no additional commitments made within this submittal.

Very truly yours, Luke H. Graessle Manager, Regulatory Affairs TBE/nls Attachments: 1 - Calculation 2007-13241 (Rev. 1) 2 - Calculation 2007-1670 (Rev. 0)

ULNRC-05542 September 15, 2008 Page 3 cc: Mr. Elmo E. Collins, Jr.

Regional Administrator U.S. Nuclear Regulatory Commission Region IV 612 E. Lamar Blvd., Suite 400 Arlington, TX 76011-4125 Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 Mr. Mohan C. Thadani (2 copies)

Licensing Project Manager, Callaway Plant Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Mail Stop O-8G14 Washington, DC 20555-2738 I

ULNRC-05542 September 15, 2008 Page 4 Index and send hardcopy to QA File A160.0761 Hardcopy:

Certrec Corporation 4200 South Hulen, Suite 630 Fort Worth, TX 76109 (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 Responses and Reports ULNRC Distribution:

A. C. Heflin w/o F. M. Diya w/o T. E. Herrmann D. W. Neterer w/o L. H. Graessle w/o S. M. Maglio w/o T. B. Elwood w/o S. L. Abel M. D. Brandes S. L. Gallagher w/o L. M. Belsky (NSRB) w/o Mr. Ron Reynolds, Director (SEMA) w/o Mr. Edward Gray, Senior REP Planner (SEMA) w/o Mr. John Campbell, REP Planner (SEMA) w/o Ms. Diane M. Hooper (WCNOC) w/o Mr. Dennis Buschbaum (TXU) w/o Mr. Scott Bauer (Palo Verde) w/o Mr. Stan Ketelsen (PG&E) w/o Mr. Scott Head (STP) w/o Mr. John ONeill (Pillsbury Winthrop Shaw Pittman LLP) w/o Mr. Floyd Gilzow (DNR) w/o