NLS2016007, Submittal of Annual Report of Changes and Errors in Emergency Core Cooling System Evaluation Models for 2015

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Submittal of Annual Report of Changes and Errors in Emergency Core Cooling System Evaluation Models for 2015
ML16029A478
Person / Time
Site: Cooper Entergy icon.png
Issue date: 01/21/2016
From: Shaw J
Nebraska Public Power District (NPPD)
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
NLS2016007
Download: ML16029A478 (3)
v • d • e


Text

-t N

Nebraska Public Power District Always there when you need us NLS201 6007 50.46(a)(3)(ii)

January 21, 2016 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555-0001

Subject:

Annual Report of Changes and Errors in Emergency Core Cooling System Evaluation Models for 2015 Cooper Nuclear Station, Docket No. 50-298, DPR-46

Reference:

Letter from Jim Shaw, Nebraska Public Power District, to U.S. Nuclear Regulatory Commission, dated January 21, 2015, "Annual Report of Changes and Errors in Emergency Core Cooling System Evaluation Models for 2014"

Dear Sir or Madam:

The purpose of this letter is to submit the 2015 annual report of changes or errors in the Emergency Core Cooling System (ECCS) evaluation models pursuant to 10 CFR 50.46(a)(3)(ii) for Cooper Nuclear Station (CNS).

In the reference letter, Nebraska Public Power District reported it would pursue additional action due to the limited margin to the 2200°F Peak Cladding Temperature (PCT) limit for both fuel types currently in the core. CNS contracted with the fuel vendor to evaluate Maximum Average Planar Linear Heat Generation Rate (MAPLHGR) limit setdowns to reduce the licensing basis peak clad temperature (LB PCT). The results of this reanalysis are provided below.

The revised LB PCT will be 2150°F for both GEl4 and GNF2 fuel types. This change in the LB PCT is a result of a 1.1% PLHGRiMAPLHGR setdown for GEl4 and a 2.0% PLHGR/

MAPLHGR setdown for GNF2. Use of the revised LB PCT was approved on September 1, 2015, by Engineering Calculation NEDC 99-046, "Review of GE Calculation - Cooper Nuclear Station SAFER/GESTR-LOCA Analysis," Revision 9. This document accepted the use of General Electric Hitachi/Global Nuclear Fuel Report 002N7432-R1, "Updated LHGR/

MAPLHGR Limits for Cooper GEl4 and GNF2 Fuel." The revised LB PCT was applied on September 1, 2015.

The previously reported LB PCT limits in the reference letter were 21 95°F for GEl4 fuel and 2180°F for GNF2 fuel. The subsequent changes of-45°F (GEl4) and -30°F (GNF2) are not classified as significant per 10CFR 50.46(a)(3)(i).

P.O. Box 98 /Brownville, NE 68321-0098 / ,'J Telephone: (402) 825-3811/ Fax:. (402) 825-5211Il wv.nppd.com

.4 NLS2016007 Page 2 of 2 The reanalysis incorporated all errors/changes applicable to the ECCS evaluation models for GEl4 and GNF2 fuel types that were previously reported in the 2014 annual report. Since September 1, 2015, there have been no other changes or errors affecting the LB PCT. CNS continues to comply with the PCT limit of 2200°F specified in 10 CFR 50.46(b)(1) for both GE14 and GNF2 fuel types.

This letter makes no regulatory commitments.

If you have any questions regarding this report, please contact Jeremy Custer, Reactor and Fuels Engineering Supervisor, at (402) 825-5653.

Sincerely, LimcenSiang Manager

/lb

Attachment:

LB PCT Limits in Emergency Core Cooling System Evaluation Models for 2015 Nebraska Public Power District - Cooper Nuclear Station cc: Regional Administrator w/attachment USNRC - Region IV Cooper Project Manager w/attachment USNRC - NRR Plant Licensing Branch IV-2 Senior Resident Inspector w/attacbment USNRC- CNS NPG Distribution w/attachment CNS Records w/attacbment

NLS2016007 Attachment Page 1 of 1 LB PCT Limits in Emergency Core Cooling System Evaluation Models for 2015 Nebraska Public Power District - Cooper Nuclear Station Fuel Type Licensing Basis PCT (0 F) Local Oxidation (%) Core-Wide Metal-Water Reaction (%)

GE14 2150 <6.00 <0.10 GNF2 2150 <6.00 <0.10

-t N

Nebraska Public Power District Always there when you need us NLS201 6007 50.46(a)(3)(ii)

January 21, 2016 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555-0001

Subject:

Annual Report of Changes and Errors in Emergency Core Cooling System Evaluation Models for 2015 Cooper Nuclear Station, Docket No. 50-298, DPR-46

Reference:

Letter from Jim Shaw, Nebraska Public Power District, to U.S. Nuclear Regulatory Commission, dated January 21, 2015, "Annual Report of Changes and Errors in Emergency Core Cooling System Evaluation Models for 2014"

Dear Sir or Madam:

The purpose of this letter is to submit the 2015 annual report of changes or errors in the Emergency Core Cooling System (ECCS) evaluation models pursuant to 10 CFR 50.46(a)(3)(ii) for Cooper Nuclear Station (CNS).

In the reference letter, Nebraska Public Power District reported it would pursue additional action due to the limited margin to the 2200°F Peak Cladding Temperature (PCT) limit for both fuel types currently in the core. CNS contracted with the fuel vendor to evaluate Maximum Average Planar Linear Heat Generation Rate (MAPLHGR) limit setdowns to reduce the licensing basis peak clad temperature (LB PCT). The results of this reanalysis are provided below.

The revised LB PCT will be 2150°F for both GEl4 and GNF2 fuel types. This change in the LB PCT is a result of a 1.1% PLHGRiMAPLHGR setdown for GEl4 and a 2.0% PLHGR/

MAPLHGR setdown for GNF2. Use of the revised LB PCT was approved on September 1, 2015, by Engineering Calculation NEDC 99-046, "Review of GE Calculation - Cooper Nuclear Station SAFER/GESTR-LOCA Analysis," Revision 9. This document accepted the use of General Electric Hitachi/Global Nuclear Fuel Report 002N7432-R1, "Updated LHGR/

MAPLHGR Limits for Cooper GEl4 and GNF2 Fuel." The revised LB PCT was applied on September 1, 2015.

The previously reported LB PCT limits in the reference letter were 21 95°F for GEl4 fuel and 2180°F for GNF2 fuel. The subsequent changes of-45°F (GEl4) and -30°F (GNF2) are not classified as significant per 10CFR 50.46(a)(3)(i).

P.O. Box 98 /Brownville, NE 68321-0098 / ,'J Telephone: (402) 825-3811/ Fax:. (402) 825-5211Il wv.nppd.com

.4 NLS2016007 Page 2 of 2 The reanalysis incorporated all errors/changes applicable to the ECCS evaluation models for GEl4 and GNF2 fuel types that were previously reported in the 2014 annual report. Since September 1, 2015, there have been no other changes or errors affecting the LB PCT. CNS continues to comply with the PCT limit of 2200°F specified in 10 CFR 50.46(b)(1) for both GE14 and GNF2 fuel types.

This letter makes no regulatory commitments.

If you have any questions regarding this report, please contact Jeremy Custer, Reactor and Fuels Engineering Supervisor, at (402) 825-5653.

Sincerely, LimcenSiang Manager

/lb

Attachment:

LB PCT Limits in Emergency Core Cooling System Evaluation Models for 2015 Nebraska Public Power District - Cooper Nuclear Station cc: Regional Administrator w/attachment USNRC - Region IV Cooper Project Manager w/attachment USNRC - NRR Plant Licensing Branch IV-2 Senior Resident Inspector w/attacbment USNRC- CNS NPG Distribution w/attachment CNS Records w/attacbment

NLS2016007 Attachment Page 1 of 1 LB PCT Limits in Emergency Core Cooling System Evaluation Models for 2015 Nebraska Public Power District - Cooper Nuclear Station Fuel Type Licensing Basis PCT (0 F) Local Oxidation (%) Core-Wide Metal-Water Reaction (%)

GE14 2150 <6.00 <0.10 GNF2 2150 <6.00 <0.10

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