ML11130A026

Response to Request for Additional Information for License Renewal Application

ML11130A026
Person / Time
Site:	South Texas
Issue date:	05/05/2011
From:	Gerry Powell South Texas
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NOC-AE-11002670
Download: ML11130A026 (4)

Text

JLM11"m Nuclear Operating Company South Texas Pro/cd Electric GeneratinS Station P0 Box 289 Wdswvorth Texas 77483

-Wv-/---

May 05, 2011 NOC-AE-1 1002670 10CFR54 STI: 32862176 File: G25 U. S. Nuclear Regulatory Commission Attention: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2746 South Texas Project Units 1 and 2 Docket Nos. STN 50-498, STN 50-499 Response to Request for Additional Information for the South Texas Proiect License Renewal Application

Reference:

1. STPNOC Letter dated October 25, 2010, from G. T. Powell to NRC Document Control Desk, "License Renewal Application", (NOC-AE-10002607) (ML103010257)

2. NRC letter dated April 14, 2011, "Requests for Additional Information for the Review of the South Texas Project, License Renewal Application -

Electrical Branch Scoping", (ML110890764)

By Reference 1, STP Nuclear Operating Company (STPNOC) submitted the License Renewal Application (LRA) for South Texas Project (STP) Units 1 and 2. By Reference 2, the NRC staff requested additional information for the review of the STP LRA. STPNOC's response to the request for additional information is included in the Enclosure to this letter.

There are no regulatory commitments in this letter.

Should you have any questions regarding this letter, please contact either Arden Aldridge, STP License Renewal Project Lead, at (361) 972-8243 or Ken Taplett, STP License Renewal Project Regulatory point-of-contact, at (361) 972-8416.

I declare under penalty of perjury that the foregoing is true and correct.

Executed on Mooszod

'Date G. T. Powell Vice President, Technical Support & Oversight KJT

Enclosure:

STPNOC Response to Request for Additional Information

cc:

(paper copy without enclosures)

Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 612 East Lamar Blvd, Suite 400 Arlington, Texas 76011-4125 Balwant K. Singal Senior Project Manager U.S. Nuclear Regulatory Commission One White Flint North (MS 8B1) 11555 Rockville Pike Rockville, MD 20852 Senior Resident Inspector U. S. Nuclear Regulatory Commission P. 0. Box 289, Mail Code: MN116 Wadsworth, TX 77483 C. M. Canady City of Austin Electric Utility Department 721 Barton Springs Road Austin, TX 78704 John W. Daily License Renewal Project Manager (Safety)

U.S. Nuclear Regulatory Commission One White Flint North (MS O11-F1) 11555 Rockville Pike Rockville, MD 20852 Tam Tran License Renewal Project Manager (Environmental)

U. S. Nuclear Regulatory Commission One White Flint North (MS 011 F01) 11555 Rockville Pike Rockville, MD 20852 NOC-AE-1 1002670 Page 2 (electronic copy without enclosures)

A. H. Gutterman, Esquire Kathryn M. Sutton, Esquire Morgan, Lewis & Bockius, LLP John Ragan Catherine Callaway Jim von Suskil NRG South Texas LP Ed Alarcon Kevin Polio Richard Pena City Public Service Peter Nemeth Crain Caton & James, P.C.

C. Mele City of Austin Richard A. Ratliff Alice Rogers Texas Department of State Health Services Balwant K. Singal John W. Daily Tam Tran U. S. Nuclear Regulatory Commission

Enclosure NOC-AE-1 102670 Page 1 STPNOC Response to Request for Additional Information RAI 2.5-1, Temperature sensors/transducers subject to aging management review.

Background:

NEI 95-10, "Industry Guideline for Implementing the Requirements of 10 CFR Part 54 - The License Renewal Rule," Appendix B indicates that elements, resistance temperature detectors (RTDs), sensors, thermocouples and transducers should be included in the list of components/commodity groups subject to Aging Management Review if a pressure boundary is applicable.

Issue:

The staff cannot find these components/groups in the applicant's LRA.

Request:

Please justify why these components are not included in Section 2.5 of the License Renewal Application.

STPNOC Response The commodity group associated with elements, Resistance Temperature Detectors (RTDs),

sensors, thermocouples and transducers designated as "thermowell" are found in Sections 2.3.3 and 2.3.4 of the LRA. The following mechanical systems have component type "thermowell" with an intended function of "pressure boundary". These "thermowells" are within the scope of license renewal and are subject to an aging management review.

Spent Fuel Pool Cooling & Cleanup (LRA Table 2.3.3-2)

Essential Cooling Water & ECW Screen Wash (LRA Table 2.3.3-4)

Chilled Water HVAC (LRA Table 2.3.3-9)

Chemical & Volume Control (LRA Table 2.3.3-19)

Standby Diesel Generator (LRA Table 2.3.3-20)

Liquid Waste Processing (LRA Table 2.3.3-22)

Main Steam (LRA Table 2.3.4-1)

Auxiliary Feedwater (LRA Table 2.3.4-6)

RAI 2.5-2, Control circuits and structures associated with Station Blackout (SBO) recovery.

Background:

In accordance with 10 CFR 54.4(a)(3) and SRP-LR section 2.5.2.1.1, the control circuits and structures associated with the switchyard circuit breakers used to supply the SBO recovery paths should be within the scope of license renewal.

Issue:

The applicant has not included these components/groups within the scope of license renewal.

Request:

Please confirm whether these components are within the scope of license renewal. If not within scope, then justify why they are not included.

STPNOC Response Switchyard circuit breakers within the scope of license renewal remain in position when offsite power is interrupted. Each of the breakers contains stored energy such that the breakers may be operated without use of control circuits during a loss of offsite power event. Therefore control circuits are not required for station blackout recovery and are not within the scope of license renewal.

Enclosure NOC-AE-1 102670 Page 2 The structures associated with the switchyard station blackout recovery path are within the scope of license renewal. See LRA Section 2.4.7 "Electrical Foundations and Structures".