ML17207A163

Arkansas Nuclear One, Units 1 and 2 - 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:	Stephanie Pyle Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
0CAN071701
Download: ML17207A163 (4)

Text

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.

Entergy Operations, Inc. 1448 S.R. 333 Russellville, AR 72802 Tel 479-858-4704 Stephenie L. Pyle Manager, Regulatory Assurance Arkansas Nuclear One

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 (PCT), (°F)

Evaluation Model (EM) Used AOR Date Adjustment as of End-of-Year (EOY 2015), (°F) Net PCT at the EOY 2015, (°F) New Adjustments for Calendar Year 2016, (°F) Net PCT at the EOY 2016, (°F) ANO-1 Small-Break Loss-of-Coolant Accident (SBLOCA) 1459 RELAP5 / MOD2-B&W February 2011 None 1459 (estimated)

None (Note) 1459 (estimated) Large-Break Loss-of-Coolant

Accident (LBLOCA) 2008.1 RELAP5 / MOD2-B&W July 2005 None 2008.1 (estimated)

None (Note) 2008.1 (estimated) ANO-2 SBLOCA 2111 S2M October 2007 None 2111 (analyzed)

None 2111 (analyzed)

LBLOCA 2144 1999 EM January 2008 None 2144 (analyzed)

None 2144 (analyzed)