ML12011A009

STP - Record of Conference Call 01102012 on Aluminum-Bronze RAI Responses.Docx

ML12011A009
Person / Time
Site:	South Texas
Issue date:	02/09/2012
From:	Daily J License Renewal Projects Branch 1
To:
Daily J
References
TAC ME4936, TAC ME4937
Download: ML12011A009 (6)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 February 9, 2012 LICENSEE: STP Nuclear Operating Company FACILITY: South Texas Project

SUMMARY

OF TELEPHONE CONFERENCE CALL HELD ON JANUARY 10, 2012, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND STP NUCLEAR OPERATING COMPANY, REGARDING APPLICANT RESPONSES ON ALUMINUM-BRONZE PROGRAMS, FOR THE SOUTH TEXAS PROJECT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC. NOS. ME4936 AND ME4937)

The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of STP Nuclear Operating Company (STPNOC or the applicant) held a telephone conference call on January 10, 2012, to discuss and clarify issues related to the applicant's responses to requests for additional information (RAls) on the applicant's aluminum-bronze Aging Management Program (AMP), for the South Texas Project, Units 1 and 2, license renewal application. The telephone conference call was useful in clarifying the applicant's responses and identifying the staff's Issues for the RAls. provides a listing of the participants and Enclosure; 2 contains a listing of the issues discussed with the applicant, including a brief description of the status of the items.

The applicant had an opportunity to comment on this summary.

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t\AM John Daily, Senior ProJect'Manager Projects Branch 1 Division of License Renewal Office of Nuclear Reactor Regulation Docket Nos. 50-498 and 50-499

Enclosures:

As stated cc w/ends: ListserJ

TELEPHONE CONFERENCE CALL SOUTH TEXAS PROJECT LICENSE RENEWAL APPLICATION LIST OF PARTICIPANTS JANUARY 10, 2012 PARTICIPANTS AFFILIATIONS I John Daily r Regulatory Commission (NRC)

Bill Holston NRC John Wise NRC Jinhui Diao NRC

~Aldridge STP Nuclear Operating Company (STPNOC)

I Ken T aplett STPNOC I Mark Wales NOC Kevin Regis STPNOC Albert Mcintyre STPNOC Richard Kersey STPNOC Michael Garner STPNOC Suryant (Sam) Patel STPNOC STARS Center of Business - Worley Gary Warner Parsons ENCLOSURE 1

CONFERENCE CALL WITH STPNOC REGARDING APPLICANT RESPONSES ON ALUMINUM-BRONZE PROGRAMS STP LICENSE RENEWAL APPLICATION JANUARY 10, 2012 The U.S. Nuclear Regulatory Commission (NRC or the staff) and representatives of STP Nuclear Operating Company (STPNOC or the applicant) held a telephone conference call on January 10, 2012, to discuss and clarify the applicant's responses to RAls B2.1.37 -1 and B2.1.37-2, related to the license renewal application (LRA).

The participants indicated that the calls were useful in clarifying the questions discussed.

Issues and discussions:

The staff explained its general approach to evaluating the aging management of aluminum bronze components susceptible to selective leaching in terms of what will be needed:

• Given the large number of aluminum-bronze defects that have gone through-wall and the unknown condition of the underground pipe welds, the staff needs to be able to conclude that the analytical basis of this plant-specific phenomenon is adequate to demonstrate structural integrity throughout the period of extended operation. The applicant's analyses and discussions (in the RAI responses and others if necessary) should demonstrate an adequate basis for why emergent through-wall defects and undiscovered dealloying would be acceptable.

• The program should conduct sufficient inspections to determine the worst-case degradation occurring in the ten-year period prior to the period of extended operation.

• The program should conduct sufficient inspections to confirm that continued degradation during the period of extended operation is fully bounded by the applicant's assumptions.

Discussion revolved around the following topics relative to the responses to RAls B2.1.37 -1 and B2.1.37 -2, in order for the staff to better understand the applicant's responses.

• Material properties used in APTECH Calculation 8303381, letter ST-HL-AE-2748, calculation AES-C-1964-1, and calculation AES-C-1630-2

• HL&P Lab Report MT-3512 and its statement about time-dependent crack propagation

• STP Relief requests 44,42, 37, and 25

• RAI B2.1.37-1 Response Tables 1 and 2

• Acceptance criteria in STP calculations versus American Society of Mechanical Engineers (ASNlE) Code Section XI design factors

• How the output from the above calculations are used when a selective leaching site is discovered in the plant ENCLOSURE 2

-2

• Number and timing of destructive examinations in relation to confirming degree of selective leaching

... IV! L 120 11 a009 LARPB1 :DLR PM:RPB1 :DLR BC:RPB1 :DLR PM:RPB1 :DLR I OFFICE YEdmonds JDaily DMorey .JDaily NAME DATE 02/09112 02/09/12 02/09/12 02/09/12 Memorandum to File from J. Daily dated February 9,2012

SUMMARY

OF TELEPHONE CONFERENCE CALL HELD ON JANUARY 10, 2012, BETWEEN THE U.S. NUCLEAR REGULATORY COMMISSION AND STP NUCLEAR OPERATING COMPANY, REGARDING APPLICANT RESPONSES ON ALUMINUM-BRONZE AGING MANAGEMENT PROGRAMS, FOR THE SOUTH TEXAS PROJECT, UNITS 1 AND 2, LICENSE RENEWAL APPLICATION (TAC. NOS. ME4936 AND ME4937)

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