NOC-AE-17003468, 10 CFR 50.46 Thirty-Day Report of Significant ECCS Model Changes

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10 CFR 50.46 Thirty-Day Report of Significant ECCS Model Changes
ML17139D354
Person / Time
Site: South Texas STP Nuclear Operating Company icon.png
Issue date: 05/10/2017
From: Dunn R
South Texas
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
NOC-AE-17003468, STI:34483335
Download: ML17139D354 (2)
v • d • e


Text

South kras Pro/eel £/t:dric Gem;r.1ti11f{Si<ltfo11 PO. ~ 289 l#ulswdrth. Tex:1s 77483 May 10, 2017 NOC-AE-17003468 10 CFR 50.46 (a)(3)(ii)

  • U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555-0001 South Texas Project Unit 1 Docket No. STN 50-498 10 CFR 50.46 Thirty-Day Report of Significant ECCS Model Changes

References:

Letter from R. Dunn to NRC Document Control Oesk, "1 O CFR 50.46 Thirty-Day Report of Significant ECCS Model Changes and Annual Report," dated November 22, 2016, NOC-AE-16003422(ML16336A637)

In accordance with the requirements of 10 CFR 50.46 (a)(3)(ii), STP Nuclear Operating Company (STPNOC) is submitting a 30-day report for a significant change in the South Texas Unit 1 Emergency Core Cooling System (ECCS) Model.

In referenced letter, STP identified for Unit 1 Cycle 20 there was no peak clad temperature (PCT) penalty due to gamma energy deposition model (GEOM) violation, so the 3°F penalty was no longer applicable, and the PCT was reduced from 2120°F down to 2117°F. For Unit 1 Cycle 21, there is no change in PCT penalty, so the PCT remains at 2117°F. Since the absolute value of PCT changes to the Analysis of Record still remains above 50°F, the change from the Analysis of Record is considered significant in accordance with 10 CFR 50.46

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No schedule for reanalysis is proposed since the Unit 1 Cycle 21 PCT remains below the 10 CFR 50.46 (b)(1) limit of 2200°F.

There are no commitments in this letter.

If there are any questions regarding this information please contact Safdar Hafeez at 361-972-8906.

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  • I Roland Dunn. >
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Nuclear Fuel and Analysis

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NOC-AE-17003468

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(Paper Copy) * (Electronic Copy)

Regional Administrator, Region IV Morgan. Lewis & Beckius LLP U. S. Nuclear Regulatory Commission Steve Frantz, Esquire 1600 East Lamar Boulevard Paul Bessette Arlington, TX 76011-4511 U.S. Nuclear Regulatory Commission Lisa M. Regner Lisa M. Regner Senior Project Manager U.S. Nuclear R~gulatory Commission NRG South Texas LP One White Flint North (08H04) Mark Walker 11555 Rockville Pike Jim von Suskil Rockville, Mp 20852 Skip Zahn

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NRC Resident Inspector CPS Energy U. S. Nuclear Regulatory Commission Kevin Pollo P. 0. Box 289, Mail Code: MN116 Cris Eugster Wadsworth, TX 77 483 L. D. Blaylock City of Austin Elaina Ball John Wester Texas Dept. of State Health Services Helen Watkins Robert Free

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STI: 34483335

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