ML083310006

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Draft RAIs Request for Relief to Extend the D.C. Cook Unit 2 Inservice Inspection Interval for the Reactor Vessel Weld Examination (ISIR-29)
ML083310006
Person / Time
Site: Cook American Electric Power icon.png
Issue date: 11/26/2008
From: Beltz T
Plant Licensing Branch III
To: Scarpello M, Waters J
American Electric Power Co
beltz T, NRR/DORL/LPL3-1, 301-415-3049
References
TAC MD9934
Download: ML083310006 (2)


Text

From:

Terry Beltz Sent:

Wednesday, November 26, 2008 6:42 AM To:

'mkscarpello@aep.com'; 'jrwaters@aep.com' Cc:

Dan Widrevitz; Matthew Mitchell

Subject:

Draft RAI re: Request for Relief to Extend the D.C. Cook Unit 2 Inservice Inspection Interval for the Reactor Vessel Weld Examination (ISIR-29) (TAC No. 9943)

Michael and Joe By letter dated October 9, 2008 (ADAMS Accession No. ML082980354), Indian Michigan Power Company (I&M) submitted a relief request for the Donald C. Cook Nuclear Plant Unit 2 (CNP-2). The proposed relief request pertains to a new inservice inspection (ISI) schedule for the CNP-2 reactor vessel shell welds.

The U.S. Nuclear Regulatory Commission (NRC) staff in the Vessels and Internals Integrity Branch (CVIB) has completed its preliminary review of your submittal. The staff requires additional information to complete the review.

Our technical reviewer, Daniel Widrevitz, has developed the following questions which we would like to discuss with you in a conference call:

RAI 1

In Section 3.4 of the Final Safety Evaluation Report issued 05/09/2008 (ADAMS Accession No. ML081060045), the NRC staff notes that licensees submitting a request for an alternative based on Topical Report (TR) WCAP-16168,Risk-Informed Extension of the Reactor Vessel In-Service Inspection Interval, must submit the following plant-specific information:

1. Licensees must demonstrate that the RTmax-x and the shift in the Charpy transition temperature produced by irradiation defined at the 30 ft-lb energy level, T30 must be calculated using the latest approved methodology documented in Regulatory Guide 1.99, Radiation Embrittlement of Reactor Vessel Materials, or other NRC-approved methodology.

Other NRC-approved methodology includes equations 5, 6, and 7 as described in paragraph (g) of the proposed Title 10 of the Code of Federal Regulations (CFR) 50.61a rule as published in the Federal Register, Vol. 72, No. 191, dated October 3, 2007. However, paragraph (f)(6) of the proposed rule contains a prescriptive approach to determining the validity of implementing equations 5 through 7 of paragraph (g) for the calculation of T30 values. Data from a plant-specific or integrated surveillance program shall be evaluated in accordance with 10 CFR 50.61a(f)(6) to validate use of the associated embrittlement model.

The licensee has implemented the use of equations prescribed in proposed 10 CFR 50.61a(g),

NUREG-1874, and WCAP-16168 to determine T30 values for the beltline materials.

The NRC staff requests information consistent with the requirements of proposed rule 10 CFR 50.61a(f)(6) that establishes the applicability of equations 5 through 7 as given in 10 CFR 50.61a(g) for calculating T30 values for their plants beltline materials.

RAI 2

The licensee states that they are bounded by 7 heatup/cooldowns per year in Table 1 of the submittal.

Please cite the plant design basis for heatup/cooldowns per year.

RAI 3

The submittal the licensee cites compositions in terms of Cu, Ni, P, and Mn for Items 1-9 in Table 3 of the submittal. These compositions are not consistent with NRC records in Reactor Vessel Integrity Database (RVID).

Please explain where the Cu, Ni, and P compositions were accepted by the NRC or provide new data. Also, please explain on what basis the reported Mn compositions were determined.

This e-mail aims solely to prepare you and others for the proposed conference call. We can discuss the draft questions and how to disposition them during any subsequent conference call.

This e-mail does not formally convey an NRC staff position, nor does it formally request additional information. With or without the conference call, we plan to issue the formal RAIs to you in the near future and no later than December 12, 2008.

Sincerely, Terry A. Beltz, Senior Project Manager Plant Licensing Branch III-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation (301) 415-3049 Terry.Beltz@nrc.gov cc: Daniel Widrevitz Matthew Mitchell E-mail Properties Mail Envelope Properties ()

Subject:

Draft RAI re: Request for Relief to Extend the D.C. Cook Unit 2 Inservice Inspection Interval for the Reactor Vessel Weld Examination (ISIR-29) (TAC No. 9943)

Sent Date: 11/25/2008 3:11:22 PM Received Date: 11/26/2008 6:42:00 AM From: Terry Beltz

Created By: Terry.Beltz@nrc.gov Recipients:

mkscarpello@aep.com ('mkscarpello@aep.com')

Tracking Status: None jrwaters@aep.com ('jrwaters@aep.com')

Tracking Status: None Dan.Widrevitz@nrc.gov (Dan Widrevitz)

Tracking Status: None Matthew.Mitchell@nrc.gov (Matthew Mitchell)

Tracking Status: None Post Office:

Files Size Date & Time MESSAGE 14612 11/25/2008 Options Expiration Date:

Priority: olImportanceNormal ReplyRequested: False Return Notification: False Sensitivity: olNormal Recipients received: