0CAN071701, Annual 10 CFR 50.46 Report for Calendar Year 2016, Emergency Core Cooling System Evaluation Changes

Annual 10 CFR 50.46 Report for Calendar Year 2016, Emergency Core Cooling System Evaluation Changes

ML17207A163
Person / Time
Site:	Arkansas Nuclear
Issue date:	07/26/2017
From:	Pyle S Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
0CAN071701
Download: ML17207A163 (4)

Text

Entergy Operations, Inc.

1448 S.R. 333 Russellville, AR 72802 Tel 479-858-4704 Stephenie L. Pyle Manager, Regulatory Assurance Arkansas Nuclear One 0CAN071701 July 26, 2017 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

SUBJECT:

Annual 10 CFR 50.46 Report for Calendar Year 2016 Emergency Core Cooling System Evaluation Changes Arkansas Nuclear One - Units 1 and 2 Docket Nos. 50-313 and 50-368 License Nos. DPR-51 and NPF-6 REFERENCE Entergy submittal to the NRC, Annual 10 CFR 50.46 Report for Calendar Year 2015 Emergency Core Cooling System Evaluation Changes, dated June 22, 2016 (ML16175A383)

Dear Sir or Madam:

10 CFR 50.46(a)(3)(ii) requires licensees to report annually each change to or error discovered in an acceptable evaluation model or in the application of such model for the emergency core cooling system (ECCS) that affects the peak cladding temperature (PCT). Entergy Operations, Inc. (Entergy), has reviewed the small and large break loss-of-coolant accident (LOCA) PCT evaluations for both Arkansas Nuclear One, Units 1 and 2 (ANO-1 and ANO-2).

No issues were identified for ANO-1 or ANO-2 in 2016 that impacted the results reported for the calendar year 2015 referenced above.

A summary / overview of the information required to be submitted each year is attached to this submittal.

This submittal fulfills the reporting requirements referenced above.

This letter contains no new regulatory commitments.

0CAN071701 Page 2 of 2 If you have any questions or require additional information, please contact me.

Sincerely, ORIGINAL SIGNED BY STEPHENIE L. PYLE SLP/rwc

Attachment:

Summary / Overview of Information for Arkansas Nuclear One, Units 1 and 2 10 CFR 50.46 Annual Report for 2016 cc: Mr. Kriss Kennedy Regional Administrator U. S. Nuclear Regulatory Commission, Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 NRC Senior Resident Inspector Arkansas Nuclear One P.O. Box 310 London, AR 72847 U. S. Nuclear Regulatory Commission Attn: Mr. Thomas Wengert MS O-08B1A One White Flint North 11555 Rockville Pike Rockville, MD 20852

ATTACHMENT TO 0CAN071701 Summary / Overview of Information for Arkansas Nuclear One, Units 1 and 2 10 CFR 50.46 Annual Report for 2016

Attachment to 0CAN071701 Page 1 of 1 Summary / Overview of Information for Arkansas Nuclear One, Units 1 and 2 10 CFR 50.46 Annual Report for 2016 Analysis of Record (AOR)

Peak Clad Temperature Adjustment as New (PCT), (°F) of End-of-Year Net PCT at the Adjustments for Net PCT at the (EOY 2015), EOY 2015, (°F) Calendar Year EOY 2016, (°F)

Evaluation Model (EM) Used

(°F) 2016, (°F)

AOR Date ANO-1 Small-Break 1459 Loss-of-Coolant 1459 None 1459 RELAP5 / MOD2-B&W None Accident (estimated) (Note) (estimated)

(SBLOCA) February 2011 Large-Break 2008.1 Loss-of-Coolant 2008.1 None 2008.1 RELAP5 / MOD2-B&W None Accident (estimated) (Note) (estimated)

(LBLOCA) July 2005 ANO-2 2111 2111 2111 SBLOCA S2M None None (analyzed) (analyzed)

October 2007 2144 2144 2144 LBLOCA 1999 EM None None (analyzed) (analyzed)

January 2008