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| {{#Wiki_filter:}} | | {{#Wiki_filter:AmerenUE P0 Box 620 Callaway Plant Fulton, MO 65251 October 9, 2008 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop P1-137 Washington, DC 20555-0001 ULNRC-05553 Ladies and Gentlemen: |
| | DOCKET NUMBER 50-483 WAmeren CALLAWAY PLANT UNIT 1 UE UNION ELECTRIC COMPANY FACILITY OPERATING LICENSE NPF-30 FOLLOW-UP INFORMATION REGARDING 10CFR50.55a REQUEST: PROPOSED ALTERNATIVE TO ASME SECTION XI REQUIREMENTS FOR REPLACEMENT OF CLASS 3 BURIED PIPING (TAC NO. MD6792) |
| | |
| | ==References:== |
| | : 1. AmerenUE letter ULNRC-05434 dated August 30, 2007 2. AmerenUE letter ULNRC-05490 dated April 17, 2008 3. AmerenUE letter ULNRC-05517 dated July 10, 2008 4. AmerenUE letter ULNRC-05529 dated July 24, 2008 5. AmerenUE letter ULNRC-05542 dated September 15, 2008 By letter dated August 30, 2007 (Reference 1 above), Union Electric Company (AmerenUE) submitted Relief Request 13R-10 regarding paragraph IWA-422 1(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 enable planned replacement of buried steel piping in the essential service water (ESW) system at Callaway Plant with high-density polyethylene (HDPE) piping.Following AmerenUE's initial submittal, additional letters (identified as References 2 through 4 above) were submitted to provide additional or clarifying information requested by the NRC staff. The additional information provided by AmerenUE included two calculations. |
| | One of the calculations, provided with the letter of reference 2 above, was a preliminary stress analysis for the new ESW piping configuration, i.e., Calculation 2007-16760, "Analysis of Buried HDPE Piping." The other calculation was provided via the letter of Reference 3 above, and was performed for determining the minimum design wall thickness for the HDPE piping, i.e., Calculation 2007-13241, "Minimum Wall Thickness for ESW Buried HLDPE Piping," Revision 0.a i o o o a subsidiary of Ameren Corporation ULNRC-05553 October 9, 2008 Page 2 In early September (2008), a telephone discussion was conducted with the NRC staff, wherein AmerenUE was asked to provide updated versions of the subject calculations. |
| | Accordingly, Revision 1 of Calculation 2007-13241 and Revision 0 of Calculation 2007-16760 were provided via the letter of Reference 5 above.After receipt of the updated calculations by the NRC, another telephone discussion was conducted on September 19, 2008, in which the NRC staff identified two notable differences between the versions of the calculations provided via the letter of Reference 5 and the versions provided earlier (via the letters of References 2 and 3). Specifically, it was noted that Revision 1 of Calculation 2007-13241 (the minimum wall thickness calculation) provided results obtained by use of 0.56 design factor, along with results obtained by the expected use of a 0.5 design factor. It was confirmed during the telephone discussion that the results obtained from use of the 0.56 design factor were provided for information only, as indicated in the calculation. |
| | The NRC emphasized that their review would be based solely on the use of 0.5 as the value for the design factor.With regard to the second difference discussed, it was noted that in Revision 0 of Calculation 2007-16760, the thermal gradient stress evaluation that had been provided in the preliminary version was not included. |
| | AmerenUE explained that there was a misunderstanding of whether this analysis needed to be included in the calculation. |
| | Having provided it once, AmerenUE agreed to include the thermal gradient stress eviluation in a follow-up revision of the calculation to be provided via a follow-up letter to the NRC. In accordance with that agreement, Revision 1 of Calculation 2007-16760 is hereby provided as an enclosure to this letter.In Revision 1 of Calculation 2007-16760, the thermal gradient stress evaluation is included in a second thermal load case for the HDPE piping. As discussed with the NRC subsequent to the September 19, 2008 telephone discussion, the peak normal operating ESW water temperature was assumed (in lieu of a peak post-LOCA temperature) as appropriate for this case.This letter serves to document the issues raised in the September 19, 2008 telephone conference, as well as to provide the updated calculation discussed in that telephone conference. |
| | No additional commitments are made per this letter. For questions concerning this letter, please contact Mr. Scott Maglio at (573) 676-8719.Very truly yours, Luke H. Graessle Manager -Regulatory Affairs TBE/nls Enclosure ULNRC-05553 October 9, 2008 Page 3 cc: U.S. Nuclear Regulatory Commission (Original and 1 copy)Attn: Document Control Desk Mail Stop P1-137 Washington, DC 20555-0001 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 ULNRC-05553 October 9, 2008 Page 4 Index and send hardcopy to QA File A160.0761 Hardeopy: 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 (all w/o attachments): |
| | A. C. Heflin F. M. Diya T. E. Herrmann D. W. Neterer L. H. Graessle M. A. McLachlan S. M. Maglio T. B. Elwood S. L. Abel J. L. Fortman M. D. Brandes S. L. Gallagher L. M. Belsky (NSRB)Mr. Ron Reynolds, Director (SEMA)Mr. Edward Gray, Senior REP Planner (SEMA)Mr. John Campbell, REP Planner (SEMA)Ms. Diane M. Hooper (WCNOC)Mr. Dennis Buschbaum (TXU)Mr. Scott Bauer (Palo Verde)Mr. Stan Ketelsen (PG&E)Mr. Wayne Harrison (STPNOC)Mr. John O'Neill (Pillsbury Winthrop Shaw Pittman LLP)Mr. Floyd Gilzow (DNR)}} |
Revision as of 17:08, 14 October 2018
Letter Sequence Request |
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TAC:MD6792, Addition of New Tech Spec on RCS Boron Limits and Revisions to Tech Spec 3.3.1 to Address Rwfs (Open) |
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MONTHYEARML0703900572007-02-21021 February 2007 BVPS Doc Table M Project stage: Other ML0725504882007-08-30030 August 2007 10 CFR 50.55a Request: Proposed Alternative to ASME Section Xi Requirements for Replacement of Class 3 Buried Piping Project stage: Request ULNRC-05445, One-Time Completion Time Extension for Essential Service Water (ESW) System2007-10-31031 October 2007 One-Time Completion Time Extension for Essential Service Water (ESW) System Project stage: Request ML0800400232008-01-0808 January 2008 Forthcoming Meeting with Union Electric Company on the Callaway Plant Relief and Amendment Requests Dated August 3 and October 31, 2007. (Tac No. MD6792 and MD7252) Project stage: Meeting ML0802504052008-01-23023 January 2008 Licensee Handout for Meeting with Union Electric Company on the Callaway Plant Relief Request I3R-10 to Use Plastic Pipe in the Safety-Related Essential Service Water (ESW) System Project stage: Meeting ML0803802882008-02-0707 February 2008 Preliminary Request for Additional Information Project stage: RAI ML0803806472008-02-29029 February 2008 Summary of Meeting with Union Electric Company Callaway Plant, Unit 1, 8/30/2007 Relief Request and 10/31/2007 License Amendment Request Applications Related to Replacement of Essential Service Water Piping (Tac No. MD6792 and MD7252) Project stage: Meeting ULNRC-05434, CFR50.55a Request: Proposed Alternative to ASME Section X1 Requirements for Replacement of Class 3 Buried Piping2008-04-17017 April 2008 CFR50.55a Request: Proposed Alternative to ASME Section X1 Requirements for Replacement of Class 3 Buried Piping Project stage: Request ML0815800112008-06-10010 June 2008 Request for Additional Information, Relief Request No. 13R-10 and License Amendment Request to Revise TS 3.7.8, Essential Service Water System, and TS 3.8.1, AC Sources - Operating, for One-time CT Extension Underground Piping Project stage: RAI ML0817506442008-06-24024 June 2008 Forthcoming Meeting with Union Electric Company on the Callaway Plant to Discuss the Licensee'S Responses to NRC Request for Additional Information Relief and License Amendment Requests Project stage: RAI ULNRC-05517, CFR50.55a Request: Proposed Alternative to ASME Section XI Requirements for Replacement of Class 3 Buried Piping2008-07-10010 July 2008 CFR50.55a Request: Proposed Alternative to ASME Section XI Requirements for Replacement of Class 3 Buried Piping Project stage: Request ULNRC-05529, CFR50.55a Request: Proposed Alternative to ASME Section XI Requirements for Replacement of Class 3 Buried Piping2008-07-24024 July 2008 CFR50.55a Request: Proposed Alternative to ASME Section XI Requirements for Replacement of Class 3 Buried Piping Project stage: Request ML0826307992008-09-0505 September 2008 Calculation 2007-13241, Rev. 1, Minimum Wall Thickness for ESW Buried Hdpe Piping. Project stage: Other ML0826308002008-09-12012 September 2008 Calculation 2007-16760, Rev. 0, Buried Hdpe Piping Stress Analysis. Project stage: Other 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 Piping2008-09-15015 September 2008 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 Project stage: Request ULNRC-05553, Follow-up Information Regarding 10CFR50.55a Request: Proposed Alternative to ASME Section XI Requirements for Replacement of Class 3 Buried Piping (TAC No. MD67920)2008-10-0909 October 2008 Follow-up Information Regarding 10CFR50.55a Request: Proposed Alternative to ASME Section XI Requirements for Replacement of Class 3 Buried Piping (TAC No. MD67920) Project stage: Request ML0826400072008-10-31031 October 2008 Relief Request I3R-10 for Use of Polyethylene Pipe in Lieu of Carbon Steel Pipe in Buried Essential Service Water Piping System Project stage: Acceptance Review ML0831002882008-11-0707 November 2008 Relief Request 13R-10 Approved on October 31, 2008, for Third 10-Year Inservice Inspection Interval for Use of Polyethylene Pipe in Lieu of Carbon Steel Pipe in Buried Essential Service Water Piping System Project stage: Acceptance Review ULNRC-05563, One-Time Completion Time Extension for Essential Service Water System2008-12-0101 December 2008 One-Time Completion Time Extension for Essential Service Water System Project stage: Other ML0834503272008-12-19019 December 2008 Summary of Meeting with Representatives of Union Electric Company, Licensee for Callaway Plant, Unit 1 Second Round of Requests for Information, Extension of Completion Time for Essential Service Water Systems (TAC Nos. MD6792 & MD7252) Project stage: Meeting ULNRC-06115, CFR 50.55a Request: Proposed Alternative to ASME Section XI Alternative Technical Requirements for Class 3 Buried Piping2014-06-10010 June 2014 CFR 50.55a Request: Proposed Alternative to ASME Section XI Alternative Technical Requirements for Class 3 Buried Piping Project stage: Request 2008-02-29
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Category:Letter
MONTHYEARULNRC-06853, Submittal of 2023 Fitness for Duty Performance Data Per Per 10 CFR 26.7172024-01-29029 January 2024 Submittal of 2023 Fitness for Duty Performance Data Per Per 10 CFR 26.717 IR 05000483/20230042024-01-19019 January 2024 Integrated Inspection Report 05000483/2023004 ML24008A0552024-01-19019 January 2024 Acceptance of Requested Licensing Action - Proposed Alternative to the Requirements of the ASME Code (EPID L-2023-LLR- 0061) ML23353A1712024-01-18018 January 2024 Issuance of Amendment No. 237 to Clarify Support System Requirements for the Residual Heat Removal System and Control Room Air Conditioning System Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 ML23317A0012024-01-12012 January 2024 Audit Summary Regarding LAR to Clarify Support System Requirements for the Residual Heat Removal and Control Room Air Conditioning System Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 ML23347A1212024-01-11011 January 2024 Issuance of Amendment No. 236 to Adopt TSTF-501, Revision 1, Relocate Stored Fuel Oil and Lube Volume Values to Licensee Control EPID L-2023-LLA-0046) ML24011A1492024-01-11011 January 2024 Notification of Post-Approval Site Inspection for License Renewal and Request for Information (05000483/2024011) ULNRC-06847, Supplement to Relief Request from Requirements of ASME BPV Code, Section XI, Subsection Iwl Regarding Examination and Testing of the Unbonded Post-Tensioning System (Relief Request C3R-01)2023-12-21021 December 2023 Supplement to Relief Request from Requirements of ASME BPV Code, Section XI, Subsection Iwl Regarding Examination and Testing of the Unbonded Post-Tensioning System (Relief Request C3R-01) ULNRC-06849, License Renewal Resolution for Commitments 34 and 35 Perform Evaluation of Crack Initiation and Propagation in Steam Generator Divider Plate and Tube-To-Tubesheet Welds2023-12-20020 December 2023 License Renewal Resolution for Commitments 34 and 35 Perform Evaluation of Crack Initiation and Propagation in Steam Generator Divider Plate and Tube-To-Tubesheet Welds ML23346A0392023-12-14014 December 2023 Supplemental Information Needed for Acceptance of Requested Licensing Action Request for Relief from Requirements of ASME Code, Section Xl, Examination and Testing Unbonded Post-Tensioning System ULNRC-06844, Request for Exemption from Specific Requirements in 2023 Security Rule, Enhanced Weapons, Firearms Background Checks, and Security Event Notification2023-12-0707 December 2023 Request for Exemption from Specific Requirements in 2023 Security Rule, Enhanced Weapons, Firearms Background Checks, and Security Event Notification 05000483/LER-2023-001, Submittal of LER 2023-001-00 for Callaway, Unit 1, Inoperable Instrument Tunnel Sump Level Indication Resulted in Condition Prohibited by Technical Specifications2023-11-29029 November 2023 Submittal of LER 2023-001-00 for Callaway, Unit 1, Inoperable Instrument Tunnel Sump Level Indication Resulted in Condition Prohibited by Technical Specifications ULNRC-06827, Supplement to License Amendment Request Regarding Support System Requirements for Residual Heat Removal and Control Room Air Conditioning Systems Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 (LDCN 22-0029)2023-11-20020 November 2023 Supplement to License Amendment Request Regarding Support System Requirements for Residual Heat Removal and Control Room Air Conditioning Systems Under Technical Specifications 3.4.8, 3.7.11, and 3.9.6 (LDCN 22-0029) IR 05000483/20230102023-11-15015 November 2023 NRC License Renewal Phase 1 Inspection Report 05000483 2023010 IR 05000483/20233012023-11-0909 November 2023 NRC Examination Report 05000483-2023301 ML23311A2082023-11-0909 November 2023 Reassignment of U.S. Nuclear Regulatory Commission Branch Chief in the Division of Operating Reactor Licensing for Plant Licensing Branch IV ML23297A2502023-11-0606 November 2023 Individual Notice of Consideration of Issuance of Amendment to Renewed Facility Operating License, Proposed No Significant Hazards Consideration Determination and Opportunity for a Hearing (EPID L-2022-LLA-0176) - Letter IR 05000483/20240122023-10-24024 October 2023 Information Request for the Cybersecurity Baseline Inspection, Notification to Perform Inspection (05000483/2024012) ML23293A2652023-10-24024 October 2023 3rd Quarter 2023 Integrated Inspection Report ML23240A3692023-10-0505 October 2023 Issuance of Amendment No. 235 to Revise Technical Specifications to Use of Framatome Gaia Fuel (EPID L-2022-LLA-0150) (Non-Proprietary) ML23234A1522023-10-0505 October 2023 Exemption from the Requirements of 10 CFR Part 50, Section 50.46, and Appendix K Regarding Use of M5 Cladding Material (EPID L-2022-LLE-0030) (Letter) ML23305A0942023-10-0202 October 2023 10-CW-2023-09 Post-Exam Submittal ML23270B9662023-09-27027 September 2023 10 CFR 50.55a(z)(I) Request for Relief from ASME OM Code Pump and Valve Testing Requirements for Fifth 120-Month Inservice Testing Interval ML23228A0252023-09-25025 September 2023 Issuance of Amendment No. 234 to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Test Frequencies ML23261C3852023-09-25025 September 2023 Safety Evaluation for Operating Quality Assurance Manual Revision 36A ML23166B0882023-09-20020 September 2023 Issuance of Amendment No. 233 for Adoption of Alternative Source Term and Revision of Technical Specifications ML23206A1992023-09-15015 September 2023 Regulatory Audit Summary Regarding License Amendment and Regulatory Exemptions Request for Fuel Transition to Framatome Gaia Fuel (Epids L-2022-LLA-0150 and L-2022-LLE-0030) IR 05000483/20234012023-09-13013 September 2023 NRC Security Baseline Inspection Report 05000483/2023401 ML23240A7572023-08-31031 August 2023 NRC Initial Operator Licensing Examination Approval 05000483/2023301 IR 05000483/20230052023-08-23023 August 2023 Updated Inspection Plan for Callaway Nuclear Power Plant, Unit 1 (Report 05000483/2023005) - Mid Cycle Letter 2023 ULNRC-06824, Response to Request for Additional Information Regarding Operating Quality Assurance Manual (Oqam) Revision 36A2023-08-17017 August 2023 Response to Request for Additional Information Regarding Operating Quality Assurance Manual (Oqam) Revision 36A ML23219A1392023-08-15015 August 2023 Request for Withholding Information from Public Disclosure ULNRC-06830, Transmittal of Updated Technical Specification Markup and Clean Pages for License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak2023-08-15015 August 2023 Transmittal of Updated Technical Specification Markup and Clean Pages for License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak ML23215A1972023-08-0303 August 2023 Supplement to License Amendment and Exemption Request Regarding Use of Framatome Gaia Fuel (LDCN 22-0002) ULNRC-06223, Minor Correction to License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Test Frequencies (LDCN 2020-0004)2023-07-25025 July 2023 Minor Correction to License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate Test Frequencies (LDCN 2020-0004) ULNRC-06799, Submittal of Licensee Event Report 2022-003-01, Class 1E Electrical Air Conditioning System Thermal Expansion Valve Failure Resulted in Condition Prohibited by Technical Specifications2023-07-13013 July 2023 Submittal of Licensee Event Report 2022-003-01, Class 1E Electrical Air Conditioning System Thermal Expansion Valve Failure Resulted in Condition Prohibited by Technical Specifications IR 05000483/20230022023-07-10010 July 2023 Integrated Inspection Report 05000483/2023002 ML23174A1272023-06-23023 June 2023 Cw FFD Document Request List 2023 ML23171A9942023-06-22022 June 2023 Acceptance of Request for Approval of Operating Quality Assurance Manual Revision 36a ULNRC-06821, Post-Audit Follow-Up Information in Support of Callaway'S License Amendment Request and Proposed Exemption to Allow Use of Framatome Gaia Fuel (LDCN 22-0002) (EPID L-2022-LLA-0150 and EPID L-2022-LLE-00301)2023-06-21021 June 2023 Post-Audit Follow-Up Information in Support of Callaway'S License Amendment Request and Proposed Exemption to Allow Use of Framatome Gaia Fuel (LDCN 22-0002) (EPID L-2022-LLA-0150 and EPID L-2022-LLE-00301) IR 05000483/20230112023-06-15015 June 2023 Comprehensive Engineering Team Inspection (CETI) Inspection Report 05000483/2023011 ULNRC-06822, Additional Information Regarding Request for NRC Approval of Operating Quality Assurance Manual (Oqam) Revision 36a2023-06-14014 June 2023 Additional Information Regarding Request for NRC Approval of Operating Quality Assurance Manual (Oqam) Revision 36a ML23158A1462023-06-13013 June 2023 Notification of Post-Approval Site Inspection for License Renewal and Request for Information Inspection (05000483/2023010) ULNRC-06815, Request for NRC Approval of Operating Quality Assurance Manual, Revision 36a2023-06-0505 June 2023 Request for NRC Approval of Operating Quality Assurance Manual, Revision 36a ULNRC-06818, Response to Request for Additional Information Regarding License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate .2023-06-0505 June 2023 Response to Request for Additional Information Regarding License Amendment Request to Revise Technical Specification 5.5.16, Containment Leakage Rate Testing Program, for Permanent Extension of Type a and Type C Leak Rate . ML23093A0952023-05-10010 May 2023 Issuance of Amendment No. 232 Regarding Technical Specification Changes for Spent Fuel Storage ULNRC-06816, Withdrawal of Previously Submitted Enclosures Regarding License Amendment Request for Adoption of Alternative Source Term and Revision of Technical Specifications (LDCN 21-0015)2023-05-0909 May 2023 Withdrawal of Previously Submitted Enclosures Regarding License Amendment Request for Adoption of Alternative Source Term and Revision of Technical Specifications (LDCN 21-0015) ML23129A7942023-05-0909 May 2023 Post-Audit Supplement to License Amendment Request and Exemption to Allow Use of Framatome Gaia Fuel (LDCN 22-0002) (Iepid L-2022-LLA-0150 and EPID L-2022-LLE-0030) ML23122A3172023-05-0808 May 2023 Review of the Spring 2022 Steam Generator Tube Inservice Inspections ML23118A3492023-05-0808 May 2023 Request for Withholding Information from Public Disclosure 2024-01-29
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AmerenUE P0 Box 620 Callaway Plant Fulton, MO 65251 October 9, 2008 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Stop P1-137 Washington, DC 20555-0001 ULNRC-05553 Ladies and Gentlemen:
DOCKET NUMBER 50-483 WAmeren CALLAWAY PLANT UNIT 1 UE UNION ELECTRIC COMPANY FACILITY OPERATING LICENSE NPF-30 FOLLOW-UP INFORMATION REGARDING 10CFR50.55a REQUEST: PROPOSED ALTERNATIVE TO ASME SECTION XI REQUIREMENTS FOR REPLACEMENT OF CLASS 3 BURIED PIPING (TAC NO. MD6792)
References:
- 1. AmerenUE letter ULNRC-05434 dated August 30, 2007 2. AmerenUE letter ULNRC-05490 dated April 17, 2008 3. AmerenUE letter ULNRC-05517 dated July 10, 2008 4. AmerenUE letter ULNRC-05529 dated July 24, 2008 5. AmerenUE letter ULNRC-05542 dated September 15, 2008 By letter dated August 30, 2007 (Reference 1 above), Union Electric Company (AmerenUE) submitted Relief Request 13R-10 regarding paragraph IWA-422 1(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 enable planned replacement of buried steel piping in the essential service water (ESW) system at Callaway Plant with high-density polyethylene (HDPE) piping.Following AmerenUE's initial submittal, additional letters (identified as References 2 through 4 above) were submitted to provide additional or clarifying information requested by the NRC staff. The additional information provided by AmerenUE included two calculations.
One of the calculations, provided with the letter of reference 2 above, was a preliminary stress analysis for the new ESW piping configuration, i.e., Calculation 2007-16760, "Analysis of Buried HDPE Piping." The other calculation was provided via the letter of Reference 3 above, and was performed for determining the minimum design wall thickness for the HDPE piping, i.e., Calculation 2007-13241, "Minimum Wall Thickness for ESW Buried HLDPE Piping," Revision 0.a i o o o a subsidiary of Ameren Corporation ULNRC-05553 October 9, 2008 Page 2 In early September (2008), a telephone discussion was conducted with the NRC staff, wherein AmerenUE was asked to provide updated versions of the subject calculations.
Accordingly, Revision 1 of Calculation 2007-13241 and Revision 0 of Calculation 2007-16760 were provided via the letter of Reference 5 above.After receipt of the updated calculations by the NRC, another telephone discussion was conducted on September 19, 2008, in which the NRC staff identified two notable differences between the versions of the calculations provided via the letter of Reference 5 and the versions provided earlier (via the letters of References 2 and 3). Specifically, it was noted that Revision 1 of Calculation 2007-13241 (the minimum wall thickness calculation) provided results obtained by use of 0.56 design factor, along with results obtained by the expected use of a 0.5 design factor. It was confirmed during the telephone discussion that the results obtained from use of the 0.56 design factor were provided for information only, as indicated in the calculation.
The NRC emphasized that their review would be based solely on the use of 0.5 as the value for the design factor.With regard to the second difference discussed, it was noted that in Revision 0 of Calculation 2007-16760, the thermal gradient stress evaluation that had been provided in the preliminary version was not included.
AmerenUE explained that there was a misunderstanding of whether this analysis needed to be included in the calculation.
Having provided it once, AmerenUE agreed to include the thermal gradient stress eviluation in a follow-up revision of the calculation to be provided via a follow-up letter to the NRC. In accordance with that agreement, Revision 1 of Calculation 2007-16760 is hereby provided as an enclosure to this letter.In Revision 1 of Calculation 2007-16760, the thermal gradient stress evaluation is included in a second thermal load case for the HDPE piping. As discussed with the NRC subsequent to the September 19, 2008 telephone discussion, the peak normal operating ESW water temperature was assumed (in lieu of a peak post-LOCA temperature) as appropriate for this case.This letter serves to document the issues raised in the September 19, 2008 telephone conference, as well as to provide the updated calculation discussed in that telephone conference.
No additional commitments are made per this letter. For questions concerning this letter, please contact Mr. Scott Maglio at (573) 676-8719.Very truly yours, Luke H. Graessle Manager -Regulatory Affairs TBE/nls Enclosure ULNRC-05553 October 9, 2008 Page 3 cc: U.S. Nuclear Regulatory Commission (Original and 1 copy)Attn: Document Control Desk Mail Stop P1-137 Washington, DC 20555-0001 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 ULNRC-05553 October 9, 2008 Page 4 Index and send hardcopy to QA File A160.0761 Hardeopy: 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 (all w/o attachments):
A. C. Heflin F. M. Diya T. E. Herrmann D. W. Neterer L. H. Graessle M. A. McLachlan S. M. Maglio T. B. Elwood S. L. Abel J. L. Fortman M. D. Brandes S. L. Gallagher L. M. Belsky (NSRB)Mr. Ron Reynolds, Director (SEMA)Mr. Edward Gray, Senior REP Planner (SEMA)Mr. John Campbell, REP Planner (SEMA)Ms. Diane M. Hooper (WCNOC)Mr. Dennis Buschbaum (TXU)Mr. Scott Bauer (Palo Verde)Mr. Stan Ketelsen (PG&E)Mr. Wayne Harrison (STPNOC)Mr. John O'Neill (Pillsbury Winthrop Shaw Pittman LLP)Mr. Floyd Gilzow (DNR)