GNRO-2011/00111, Request for Additional Information Regarding Extended Power Uprate

Request for Additional Information Regarding Extended Power Uprate

ML113530656
Person / Time
Site:	Grand Gulf
Issue date:	12/19/2011
From:	Krupa M A Entergy Operations
To:	Office of Nuclear Reactor Regulation, Document Control Desk
References
GNRO-2011/00111, TAC ME4679
Download: ML113530656 (5)

Text

G NRO-2011/00 111 December 19, 2011 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

SUBJECT:

Request for Additional Information Regarding Extended Power Uprate Grand Gulf Nuclear Station, Unit 1 Docket No. 50

-416 License No.

NPF-29

REFERENCES:

1. Entergy Operations, Inc. letter to the NRC (GNRO

-2010/00056), License Amendment Request

- Extended Power Uprate , September 8, 2010 (ADAMS Accession No. ML102660403)

2. NRC e-mail to Entergy Operations, Inc., Grand Gulf Extended Power Uprate Reactor Systems Branch Request for Additional Information (ME4679), December 14, 2011

Dear Sir or Madam:

In Reference 1, Entergy submitted a license amendment request (LAR) to the NRC, which proposes an extended power uprate (EPU) for Grand Gulf Nuclear Station, Unit 1 (GGNS).

To support its review and approval of this LAR

, on October 27, 2011 the NRC staff conducted an on-site audit of the implementation of stability long

-term solutions and the impact of EPU on instability and an Anticipated Transient without Scram (ATWS) event. As a result of that audit, the NRC has requested additional information (transmitted via Reference 2) pertaining to simulator scenarios reflecting EPU operating conditions

, specifically:

1. Provide data for worst

-case ATWS long

-term scenario at EPU conditions.

Include plots, sequence of events, and initial conditions.

2. Provide data for wor st-case ATWS short

-term pressure peak scenario at EPU conditions.

Include plots, sequence of events, and initial conditions.

Entergy is currently in the process of incorporating EPU

-related system modifications and operating conditions into the GGNS simulator. Based on the current schedule, Entergy commits to provide the requested data to the NRC on or before February 15, 2012.

No change is needed to the no significant hazards consideration includ ed in the initial LAR (Reference 1) as a result of the additional information provided. This letter contains one new commitment, which is identified in the attachment

. Entergy Operations, Inc.

P. O. Box 756 Port Gibson, MS 39150 Michael A. Krupa Director , Extended Power Uprate Grand Gulf Nuclear Station Tel. (601) 437

-6694 GNRO-2011/00111 Page 2 of 3 If you have any questions or require additional information, please contact Mr. Jerry Burford at 601-368-5755. Sincerely, MAK/ghd

Attachment:

List of Regulatory Commitments

GNRO-2011/00 111 Page 3 of 3 cc: Mr. Elmo E. Collins, Jr.

Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 612 East Lamar Blvd., Suite 400 Arlington, TX 76011

-4125 NRC Senior Resident Inspector Grand Gulf Nuclear Station Port Gibson, MS 39150 U. S. Nuclear Regulatory Commission ATTN: Mr. A. B. Wang, NRR/DORL ATTN: ADDRESSEE ONLY ATTN: Courier Delivery Only Mail Stop OWFN/8 B1 11555 Rockville Pike Rockville, MD 20852

-2378 State Health Officer Mississippi Department of Health P. O. Box 1700 Jackson, MS 39215

-1700 Attachment GNRO-2011/00111 Grand Gulf Nuclear Station Extended Power Uprate LIST OF REGULATORY COMMITMENTS

Attachment to GNRO-2011/00111 Page 1 of 1 LIST OF REGULATORY COMMITMENTS

The following table identifies those actions committed to by Entergy in this document. Any other statements in this submittal are provided for information purposes and are not considered to be regulatory commitments.

COMMITMENT TYPE (Check one)

SCHEDULED COMPLETION DATE (If Required)

ONE-TIME ACTION CONTINUING COMPLIANCE Entergy will provide data for the following simulator scenario runs on or before February 15, 2012:

1. Worst-case ATWS long

-term scenario at EPU conditions.

Include plots, sequence of events, and initial conditions.

2. Worst-case ATWS short

-term pressure peak scenario at EPU conditions.

Include plots, sequence of events, and initial conditions.

2/15/2011