ML14205A014
| ML14205A014 | |
| Person / Time | |
|---|---|
| Site: | South Texas  |
| Issue date: | 07/07/2014 |
| From: | Dunn R South Texas |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| G25, NOC-AE-14003157, STI: 33897028 | |
| Download: ML14205A014 (2) | |
Text
Nuclear Operating Company South Texas Pro/ect Electric Generating Station PO. Box 289 Wadsworth, Texas 77483 July 7, 2014 NOC-AE-14003157 File No.: G25 1 OCFR50.46 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555-0001 South Texas Project Unit 1 Docket No. STN 50-498 1 OCFR50.46 Thirty-Day Report of Siqnificant ECCS Model Chanqes
Reference:
Letter from R.F. Dunn to NRC Document Control Desk, "10CFR 50.46 ECCS Evaluation Model Significant Change/Error Report," dated October 17, 2012, NOC-AE-12002912 (ML12310A383)
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 Model.
The value for the hot assembly average rod Gamma Energy Deposition Model for Unit 1 Cycle 19, increased 0.0041 above the analyzed value of 0.984. This resulted in an estimated increase in Peak Clad Temperature (PCT) of 3°F to the value of 2117°F reported in the Reference letter.
The new PCT value for Unit 1 Cycle 19 is 2120°F. Since the absolute value of PCT changes to the Analysis of Record exceeds 50'F, the change is considered significant in accordance with 1 OCFR50.46(a)(3)(i).
No schedule for reanalysis is proposed since the Unit 1 Cycle 19 PCT remains below the 10CFR50.46(b)(1) limit of 2200°F.
There are no commitments in this letter.
If there are any questions please contact Charlie Albury at (361) 972-8901.
Roland F. Dunn Manager Nuclear Fuel and Analysis cra STI: 33897028
NOC-AE-14003157 Page 2 of 2 cc:
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(electronic copy)
Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 1600 East Lamar Boulevard Arlington, TX 76011-4511 Balwant K. Singal Senior Project Manager U.S. Nuclear Regulatory Commission One White Flint North (MS 8 B1) 11555 Rockville Pike Rockville, MD 20852 NRC Resident Inspector U. S. Nuclear Regulatory Commission P. 0. Box 289, Mail Code: MNl 16 Wadsworth, TX 77483 A. H. Gutterman, Esquire Morgan, Lewis & Bockius LLP Balwant K. Singal U. S. Nuclear Regulatory Commission John Ragan Chris O'Hara Jim von Suskil NRG South Texas LP Kevin Polio Cris Eugster L. D. Blaylock CPS Energy Peter Nemeth Crain Caton & James, P.C.
C. Mele John Wester City of Austin Richard A. Ratliff Texas Department of State Health Services Robert Free Texas Department of State Health Services