NRC 2013-0071, Request for Approval of Risk-Informed/Safety Based Inservice Inspection Alternative for Class 1 and 2 Piping in Accordance with 10 CFR 50.55a(a)(3)(i), Response to Request for Additional Information
| ML13221A526 | |
| Person / Time | |
|---|---|
| Site: | Point Beach  |
| Issue date: | 08/09/2013 |
| From: | Meyer L Point Beach |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| NRC 2013-0071, TAC MF1150, TAC MF1151 | |
| Download: ML13221A526 (3) | |
Text
August 9, 2013 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Point Beach Nuclear Plant, Units 1 and 2 Dockets 50-266 and 50-301 Renewed License Nos. DPR-24 and DPR-27 Request for Approval of Risk-Informed/Safety Based lnservice Inspection Alternative for Class 1 And 2 Piping In Accordance With 10 CFR 50.55a(a)(3)(i)
Response to Request for Additional Information NRC 2013-0071 10 CFR 54
References:
(1)
NextEra Energy Point Beach, LLC letter to NRC, dated March 19, 2013, Request for Approval of Risk-Informed/Safety Based lnservice Inspection Alternative for Class 1 and 2 Piping in Accordance with (2) 10 CFR 50.55a(a)(3)(i) (ML13079A092)
NRC electronic mail to NextEra Energy Point Beach, LLC, dated July 1, 2012, Point Beach Units 1 and 2-Draft RAI re: Risk Evaluation for Fifth 10-Year lSI Program Plan (TAC Nos. MF1150 and MF1151)
NextEra Energy Point Beach, LLC (NextEra) requested in Reference (1) that the Nuclear Regulatory Commission (NRC) grant relief from the requirements of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code (B&PV Code),Section XI, 2007 Edition with Addenda through 2008 from the requirements of IWB-2200 IWB-2420, IWB-2430, and IWB-2500, which provide the examination requirements for Category B-F and Category B-J welds. Similarly, relief is requested from the requirements IWC-2200, IWC-2420, IWC-2430, and IWC-2500, which provide the examination requirements for Category C-F-1 and C-F-2 welds.
Specifically, NextEra proposed to use a risk-informed/safety-based inservice inspection (RIS_B) process as an alternate to the current lSI program for Class 1 and 2 piping. The RIS_B process used in this submittal is based upon ASME Code Case N-716, Alternative Piping Classification and Examination Requirements,Section XI, Division 1.
NextEra Energy Point Beach, LLC, 6610 Nuclear Road, Two Rivers, WI 54241
Document Control Desk Page 2 Via Reference (2), the NRC determined additional information was required to enable the staff's continued review of the Request for Approval of Risk-Informed/Safety Based lnservice Inspection Alternative for Class 1 And 2 Piping. The Enclosure to this letter contains the response to the request for additional information in Reference (2).
This letter contains no new commitments and no changes to existing commitments.
Very truly yours, NextEra Energy Point Beach, LLC
- -1/.
Enclosure cc:
Administrator, Region Ill, USNRC Project Manager, Point Beach Nuclear Plant, USNRC Resident Inspector, Point Beach Nuclear Plant, USNRC Mr. Mike Verhagan, Department of Commerce, State of Wisconsin
ENCLOSURE 1 NEXTERA ENERGY POINT BEACH, LLC POINT BEACH NUCLEAR PLANT, UNITS 1 AND 2 REQUEST FOR APPROVAL OF RISK-INFORMED/SAFETY BASED INSERVICE INSPECTION ALTERNATIVE FOR CLASS 1 AND 2 PIPING IN ACCORDANCE WITH 10 CFR 50.55a(a)(3)(i)
RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION The NRC staff determined that additional information was required (Reference 1) to enable the continued review of the request for approval of risk-informed/safety based inservice inspection alternative for class 1 and 2 piping in accordance with 10 CFR 50.55a(a)(3)(i) (Reference 2). The following information is provided by NextEra Energy Point Beach, LLC (NextEra) in response to the NRC staff's request.
The U.S. Nuclear Regulatory Commission (NRC) staff in the Probabilistic Risk Assessment Licensing Branch of the Office of Nuclear Reactor Regulation has reviewed the risk evaluation submitted on March 19, 2013, by NextEra Energy Point Beach, LLC, in support of its request for approval of fifth ten-year inteNal inseNice inspection program plan (Agencywide Documents Access and Management System No. ML13079A092).
The NRC staff has identified areas where additional information is needed to complete its review, as provided below.
- 1. Please explain any inconsistencies between results of the risk impact analysis presented in Table 3.4 and the Table on page 16 of the submittal.
For example: On page 16, the change in core damage frequency for Unit 1 associated with Chemical Volume & Control with POD Credit is -1.12 x 10.10, where the same change in Table 3.4a is -1.25 x 10-10.
Response
The values in the tables on page 16 are generated using the Estimated values in the table shown on page 15. The values in Table 3.4 are generated using the Upper Bound values in the table shown on page 15.
References (1)
NRC electronic mail to NextEra Energy Point Beach, LLC, dated July 1, 2012, Point Beach Units 1 and 2-Draft RAI re: Risk Evaluation for Fifth 10-Year lSI Program Plan (TAC Nos.
MF1150 and MF1151)
(2)
NextEra Energy Point Beach, LLC letter to NRC, dated March 19, 2013, Request for Approval of Risk-Informed/Safety Based lnservice Inspection Alternative for Class 1 and 2 Piping in Accordance with 10 CFR 50.55a(a)(3)(i) (ML13079A092)
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