GNRO-2017/00060, Submittal of 2017 Report of Changes and Errors to 10CFR50.46

Submittal of 2017 Report of Changes and Errors to 10CFR50.46

ML17276B858
Person / Time
Site:	Grand Gulf
Issue date:	10/03/2017
From:	Neve D Entergy Operations
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
GNRO-2017/00060
Download: ML17276B858 (3)

Text

• .~Entergy .

Entergy Operations, Inc.

P.O. Box 756 Port Gibson, MS 39150 Douglas A. Neve

• Regulatory Assurance Manager Grand Gulf Nuclear Station Tel. (601) 437-2103 GNR0-2017/00060 October 3, 2017 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk 11555 Rockville Pike Rockville, MD 20852

SUBJECT:

2017 Report of Changes and Errors to 10CFR50.46 Docket No. 50-416 License No. NPF-29

REFERENCES:

1. Letter to the NRC, GNR0-2016/00058, "2016 Report of Changes and Errors to 10CFR50.46," dated October 27, 201.6 (ML16301A154).

Dear Sir or Madam:

In accordance with 10 CFR 50.46(a)(3)(ii) Grand Gulf Nuclear Station, Unit 1 (GGNS) is*

required to report to the Commission, at least annually, the estimated effect on the limiting Emergency Core Cooling System (ECCS) analysis caused by changes to or errors discovered in the acceptable ECCS evaluation model.

Since the last 10 CFR 50.46 report dated October 27, 2016 [see Reference 1], there has been one model change and one error discovered in the Grand Gulf Nuclear Station ECCS evaluation model. The current Licensing Basis peak clad temperature (PCT) results in a projected current PCT~ 1715°F. This is below the 2200°F acceptance criterion of 10CFR50.46.

The table below summarizes the effects of two recent notifications 2017-01 and 2017-02 to the GGNS EC.CS analysis performed by General Electric-Hitachi Nuclear Energy (GEH) for the current reporting period.

Evaluation Model: SAFER/PRIME-LOCA Estimated PCT Notification Nature Of Change . Effect (~PCT)

GNF2 2017-01 Input error in GNF2 fuel channel & LTP interface 0°F

.features, leaving default input for backflow leakaQe

GNR0-2017/00060 Page 2 of 3 through these paths not consistent with GNF2 design.

2017-02 Inputs for fuel rod plenum temperature modeling are 0°F updated to be reflective of current 1Ox10 fuel bundle rod design without a getter included in the fuel rod plenum.

Cumulative Sum of Absolute Magnitud.e of Errors During this Period. 0°F This letter contains no new Regulatory Commitments. Should you have any questions concerning the content of this letter, please contact Douglas Neve, Manager Regulatory Assurance at 601-437-2103.

Sincerely,

<~~

Dougla:N'~~

Manager Regulatory Assurance DAN/amh

GNR0-2017/00060 Page 3 of 3 cc: with Attachment and Enclosures Mr. John P. Beska, Project Manager Plant Licensing Branch 1-1 Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 0-8-C2 Washington, DC 20555 cc: without Attachment and Enclosures Mr. Kriss M. Kennedy U.S. Nuclear Regulatory Commission Regional Administrator, Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 Mr. Siva Lingham U.S. Nuclear Regulatory Commission Mail Stop OWFN 8 81 Rockville, MD 20852-2738 NRC Senior Resident Inspector Grand Gulf Nuclear Station Port Gibson, MS 39150 Dr. Mary Currier, M.D., M.P.H State Health Officer Mississippi Department of Health P.O. Box 1700 Jackson, MS 39215-1700 Email: mary.currier@msdh.ms.gov