NOC-AE-16003341, Submittal of 10 CFR 50.46 Thirty-Day Report of Significant ECCS Model Changes

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Submittal of 10 CFR 50.46 Thirty-Day Report of Significant ECCS Model Changes
ML16103A512
Person / Time
Site: South Texas STP Nuclear Operating Company icon.png
Issue date: 02/24/2016
From: Dunn R
South Texas
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
NOC-AE-16003341, STI: 34283123
Download: ML16103A512 (2)
v • d • e


Text

South Teras Project Electric Genemting Station P.O. Ba.- 289 1-'hdsworth. Texas 77./83 February 24, 2016 NOC-AE-16003341 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:

1~ - Letter from R.F. Dunn to NRC Document Control Desk, "10 CFR 50.46 ECCS c: *:: >:.:;,_;Eva1*uation Model Significant Change/Error Report," dated October 17, 2012, NOC-AE-12002912(ML12310A383)

2. Letter from R.F. Dunn to NRC Document Control Desk,, '.'10 GF:R 50.46 Thirty-Day Report of Significant ECCS Model Changes," dated Jµ)y.7, _2014, NOC-AE-14003157 (ML14205A014) . " .

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 STP Unit 1 Emergency Core Cooling System (ECCS) Model. It was discovered that the 10 CFR 50.46

  • report was-~hot issued within 30 day~ 9f $TP _Unit 1. reach_ir;ig 100% rated- thermal* power which was achieved Ori Dece-mber 3o,* 2'015: cO'nditiC:m .. Report-16-2783 was written to address this oversight.

In Reference 2, STPNOC identified that the value for the hot assembly average rod Gamma Energy Deposition Model-( GEOM) for Unit_ 1 Cygle 19, ,increased 0.0041 _above the*Joss-of-coolant accident (LOCA)re'road i:mfety analysis checklist (RSAC) limit of 0.984. This change resulted in an estimated increase of 3°F in Peak Clad Temperature (PCT) from the 211 ?°F reported in Reference 1. For Unit 1 Cycle 20, there is no PCT penalty due to GEOM violation, so the 3°F penalty no longer applies, and PCT reduces from 2120°F back to 2117°F. Since the absolute value of PCT changes to the Analysis of Record exceeds 50°F, the change is considered significant in accordance with 10 CFR 50.46 (a)(3)(i).

No-s-chedule for reanalysis-is proposed since the 'unit_ 1 Cycle ~O PQT remains below the 10 CF.R 50.46(b)(1) limit of 2200°F. _ - ' . - . ,

There are no commitments in this letter.

lf-the~e~re any ques'tions regardin'g.this.infor'mation':-~J~a~~ co_rita~cf-~harli~ Albury~{" ,,_ . - -

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Roland F. Dunn

_ M~nager,, .. ,

      • 1 Nuclear Fuel and Analysis

. ' -.. -* ~ .

    • * ,1

\ *' -* *.) ;

STI: 34283123 . : ,, f* -

NOC-AE-16003341 Page 2 of 2 cc:

(Paper Copy) (Electronic Copy)

Regional Administrator, Region IV Morgan, Lewis & Bockius LLP U.S. Nuclear Regulatory Commission Steve Frantz, Esquire 1600 East La-mar Boulevard Arlington, TX 76011-4511 U. S. Nuclear Regulatory Commission Lisa M. Regner Lisa M. Regner Senior Project Manager NRG South Texas LP U.S. Nuclear Regulatory Commission John Ragan One White Flint North (08H04) Chris O'Hara 11555 Rockville Pike Jim van Suski!

Rockville, MD 20852 CPS Energy NRC Resident Inspector Kevin Pollo U. S. Nuclear Regulatory Commission Cris Eugster P. 0. Box 289, Mail Code: MN116 L. D. Blaylock Wadsworth, TX 77 483 Crain Caton & James. P.C.

Peter Nemeth City of Austin Elaina Ball John Wester Texas Department of State Health Services Richard A. Ratliff Robert Free STI: 34283123

South Teras Project Electric Genemting Station P.O. Ba.- 289 1-'hdsworth. Texas 77./83 February 24, 2016 NOC-AE-16003341 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:

1~ - Letter from R.F. Dunn to NRC Document Control Desk, "10 CFR 50.46 ECCS c: *:: >:.:;,_;Eva1*uation Model Significant Change/Error Report," dated October 17, 2012, NOC-AE-12002912(ML12310A383)

2. Letter from R.F. Dunn to NRC Document Control Desk,, '.'10 GF:R 50.46 Thirty-Day Report of Significant ECCS Model Changes," dated Jµ)y.7, _2014, NOC-AE-14003157 (ML14205A014) . " .

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 STP Unit 1 Emergency Core Cooling System (ECCS) Model. It was discovered that the 10 CFR 50.46

  • report was-~hot issued within 30 day~ 9f $TP _Unit 1. reach_ir;ig 100% rated- thermal* power which was achieved Ori Dece-mber 3o,* 2'015: cO'nditiC:m .. Report-16-2783 was written to address this oversight.

In Reference 2, STPNOC identified that the value for the hot assembly average rod Gamma Energy Deposition Model-( GEOM) for Unit_ 1 Cygle 19, ,increased 0.0041 _above the*Joss-of-coolant accident (LOCA)re'road i:mfety analysis checklist (RSAC) limit of 0.984. This change resulted in an estimated increase of 3°F in Peak Clad Temperature (PCT) from the 211 ?°F reported in Reference 1. For Unit 1 Cycle 20, there is no PCT penalty due to GEOM violation, so the 3°F penalty no longer applies, and PCT reduces from 2120°F back to 2117°F. Since the absolute value of PCT changes to the Analysis of Record exceeds 50°F, the change is considered significant in accordance with 10 CFR 50.46 (a)(3)(i).

No-s-chedule for reanalysis-is proposed since the 'unit_ 1 Cycle ~O PQT remains below the 10 CF.R 50.46(b)(1) limit of 2200°F. _ - ' . - . ,

There are no commitments in this letter.

lf-the~e~re any ques'tions regardin'g.this.infor'mation':-~J~a~~ co_rita~cf-~harli~ Albury~{" ,,_ . - -

~~~~~~2_-8901:'.,~ :_. ~ ' - __ .- :_.;*",*: :_*: \,,~- . ,:. ::.. -- .._. :'.,_ ~: _-_ --,;~:

. r".

  • r.~; I~~ ~; - ~ '. ~-- .. ,
  • . *:i~>- ~---
  • , I

.-'_: -*- . : r ~

  • ' ', ~,. 'r ' '* ~ < ( I '
  • ' ! . '~

Roland F. Dunn

_ M~nager,, .. ,

      • 1 Nuclear Fuel and Analysis

. ' -.. -* ~ .

    • * ,1

\ *' -* *.) ;

STI: 34283123 . : ,, f* -

NOC-AE-16003341 Page 2 of 2 cc:

(Paper Copy) (Electronic Copy)

Regional Administrator, Region IV Morgan, Lewis & Bockius LLP U.S. Nuclear Regulatory Commission Steve Frantz, Esquire 1600 East La-mar Boulevard Arlington, TX 76011-4511 U. S. Nuclear Regulatory Commission Lisa M. Regner Lisa M. Regner Senior Project Manager NRG South Texas LP U.S. Nuclear Regulatory Commission John Ragan One White Flint North (08H04) Chris O'Hara 11555 Rockville Pike Jim van Suski!

Rockville, MD 20852 CPS Energy NRC Resident Inspector Kevin Pollo U. S. Nuclear Regulatory Commission Cris Eugster P. 0. Box 289, Mail Code: MN116 L. D. Blaylock Wadsworth, TX 77 483 Crain Caton & James. P.C.

Peter Nemeth City of Austin Elaina Ball John Wester Texas Department of State Health Services Richard A. Ratliff Robert Free STI: 34283123

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