ML11276A187

NRR E-mail Capture - Mur RAI (Cvib)( ME6169)

ML11276A187
Person / Time
Site:	Harris
Issue date:	09/30/2011
From:	Mozafari B Division of Operating Reactor Licensing
To:	Caves J Office of Nuclear Reactor Regulation
References
TAC ME6169
Download: ML11276A187 (3)

Text

NRR-PMDAPEm Resource From: Mozafari, Brenda Sent: Friday, September 30, 2011 6:00 PM To: Caves, John Cc: Saba, Farideh

Subject:

MUR RAI (CVIB)( ME6169).docx Importance: High

John, By letter dated April 28, 2011 (Agencywide Documents Access and Management System Accession No. ML11124A180), Carolina Power & Light Company requested approval from the U.S. Nuclear Regulatory Commission (NRC) to increase the core thermal power level of Shearon Harris Nuclear Power Plant, Unit 1 from 2,900 megawatts thermal (MWt) to 2,948 MWt, an increase of approximately 1.66% over the present licensed power level and to change the power plant technical specifications accordingly.

Based on the NRC staff review, the following additional information is requested:

1. Table Matrix-1 of NRC RS-001, Revision 0, Review Standard for Extended Power Uprates, provides the staffs basis for evaluating the potential for extended power uprates to induce aging effects on reactor vessel (RV) internals. Depending on the magnitude of the projected RV internals fluence, Table Matrix-1 may be applicable to the MUR application. In the Notes to Table Matrix-1, the staff states that guidance on the neutron irradiation-related threshold for irradiation-assisted stress corrosion cracking (SCC) for pressurized water reactor RV internal components are given in BAW-2248A, Demonstration of the Management of Aging Effects for the Reactor Vessel Internals, and WCAP-14577, Revision 1-A, License Renewal Evaluation: Aging Management for Reactor Internals. The Notes to Table Matrix-1 state that for thermal and neutron embrittlement of cast austenitic stainless steel, stress corrosion cracking (SCC), and void swelling, licensees will need to provide plant-specific degradation management programs or participate in industry programs to investigate degradation effects and determine appropriate management programs. The BAW-2248A report and the WCAP-14577, Revision 1-A have been superseded by the MRP-227 report, Pressurized Water Reactor (PWR) Internals Inspection and Evaluation Guidelines, which summarized the industrys most current recommended inspection and evaluation guidelines for RV internals. The safety evaluation dated June 22, 2011, lists the limitations and conditions imposed by the staff on use of the MRP-227 report. Please confirm the establishment of an inspection plan to manage the age-related degradation in the Shearon Harris, Unit 1 RV internals, or whether participation is planned in the industrys initiatives on age-related degradation of PWR RV internals, including submittal of a plant-specific program consistent with the MRP-227 report guidelines. For the former case, discuss your management of the above-mentioned aging effects on RV internals and demonstrate that the management is appropriate to ensure integrity and operability of RV internals to the end of license.

2. Enclosure 2,Section IV.1.C.v, Effect on Upper Shelf Energy Calculation, states that all RV materials have Charpy upper shelf energy (USE) greater than the 50 ft-lb acceptance criteria of 10 CFR Part 50, Appendix G, including the power uprate. Provide the specific Charpy USE value calculated for the limiting beltline material for 55 effective full power years (EFPY) neutron fluence, including the power uprate.

It is requested that your RAI response be provided by October 28, 2011, as discussed with your staff on September 29, 2011. If more time is needed to respond to the RAl, your request for additional time should include a basis for the need for an extension.

Brenda L. Mozafari 1

Senior Project Manager, NRR/DORL U.S. Nuclear Regulatory Commission 301-415-2020 email: brenda.mozafari@nrc.gov 2

Hearing Identifier: NRR_PMDA Email Number: 162 Mail Envelope Properties (Brenda.Mozafari@nrc.gov20110930175900)

Subject:

MUR RAI (CVIB)( ME6169).docx Sent Date: 9/30/2011 5:59:42 PM Received Date: 9/30/2011 5:59:00 PM From: Mozafari, Brenda Created By: Brenda.Mozafari@nrc.gov Recipients:

"Saba, Farideh" <Farideh.Saba@nrc.gov>

Tracking Status: None "Caves, John" <john.caves@pgnmail.com>

Tracking Status: None Post Office:

Files Size Date & Time MESSAGE 3823 9/30/2011 5:59:00 PM Options Priority: High Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:

Recipients Received: ZZZ