ML17139D354
| ML17139D354 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| 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) | |
Text
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- U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555-0001 South Texas Project Unit 1 Docket No. STN 50-498 May 10, 2017 NOC-AE-17003468 10 CFR 50.46 (a)(3)(ii) 1 O 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no peak clad temperature (PCT) penalty due to gamma energy deposition model (GEOM) violation, so the 3°F penalty was no longer applicable, and the PCT was reduced from 2120°F down to 2117°F. For Unit 1 Cycle 21, there is no change in PCT penalty, so the PCT remains at 2117°F. Since the absolute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
( a)(3)(i).
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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- Manager Nuclear Fuel and Analysis
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(Paper Copy)
Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 1600 East Lamar Boulevard Arlington, TX 76011-4511 Lisa M. Regner Senior Project Manager U.S. Nuclear R~gulatory Commission One White Flint North (08H04) 11555 Rockville Pike Rockville, Mp 20852
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NRC Resident Inspector U. S. Nuclear Regulatory Commission P. 0. Box 289, Mail Code: MN116 Wadsworth, TX 77 483 STI: 34483335
- (Electronic Copy)
_Page 29f2
- Morgan. Lewis & Beckius LLP Steve Frantz, Esquire Paul Bessette U.S. Nuclear Regulatory Commission Lisa M. Regner NRG South Texas LP Mark Walker Jim von Suskil Skip Zahn CPS Energy Kevin Pollo Cris Eugster L. D. Blaylock City of Austin Elaina Ball John Wester Texas Dept. of State Health Services Helen Watkins Robert Free