ML17179A269

Assessment Follow-Up Letter for Grand Gulf Nuclear Station

ML17179A269
Person / Time
Site:	Grand Gulf
Issue date:	06/28/2017
From:	Troy Pruett NRC/RGN-IV/DRP
To:	Emily Larson Entergy Operations
JASON KOZAL
References
Download: ML17179A269 (3)

Text

UNITED STATES NUCLEAR REGULATORY COMMISSION REGION IV 1600 E. LAMAR BLVD ARLINGTON, TX 76011-4511 June 28, 2017 Mr. Eric Larson Site Vice President Operations Entergy Operations, Inc.

Grand Gulf Nuclear Station P.O. Box 756 Port Gibson, MS 39150

SUBJECT:

ASSESSMENT FOLLOW-UP LETTER FOR GRAND GULF NUCLEAR STATION

Dear Mr. Larson:

As a result of our continuous review of plant performance the NRC updated its assessment of Grand Gulf Nuclear Station. The NRCs evaluation consisted of a review of performance indicators and inspection results. This letter informs you of the NRCs assessment and its plans for a future inspection at your facility. This letter supplements, but does not supersede, the annual assessment letter issued on March 1, 2017 (Agencywide Documents Access and Management System (ADAMS) Accession No. ML17059D517).

The NRCs review of Grand Gulf Nuclear Station identified that the Unplanned Power Changes Per 7,000 Critical Hours performance indicator has crossed the Green-to-White threshold. The performance issues included in this performance indicator were associated with three unplanned downpower events that occurred in the second quarter of 2016 due to operator actions to reset turbine stop valves, an unplanned downpower and shutdown required by technical specifications that occurred in the third quarter of 2016 due to a failure of residual heat removal subsystem A, and an unplanned downpower that occurred in the first quarter of 2017 due to condensate booster pump seal degradation.

The NRC determined the performance at Grand Gulf Nuclear Station remains in the Regulatory Response Column of the Reactor Oversight Process Action Matrix following a second White performance indicator input in the Initiating Events cornerstone beginning in the fourth quarter of 2016. Therefore, the NRC plans to conduct a supplemental inspection in accordance with Inspection Procedure 95001, Supplemental Inspection Response to Action Matrix Column 2 Inputs due to the Uplanned Power Changes Per 7,000 Critical Hours performance indicator.

Additionally, the NRC previously indicated our intent to perform a supplemental inspection in accordance with Inspection Procedure 95001 due to the Unplanned Scrams Per 7000 Critical Hours performance indicator crossing the Green-to-White threshold in the third quarter of 2016 as indicated in a letter sent on November 8, 2016 (ADAMS Accession No. ML16313A169).

As of the date of this letter we have not been notified that you are ready for this inspection.

The objectives of the supplemental inspection are: (1) to assure that the root causes and contributing causes of significant performance issues are understood, (2) to independently

E. Larson 2 assess and assure that the extent of condition and extent of cause of significant performance issues are identified, (3) to assure that corrective actions taken to address and preclude repetition of significant performance issues are prompt and effective, and (4) to assure that corrective plans direct prompt actions to effectively address and preclude repetition of significant performance issues. This inspection will be scheduled after you notify the NRC in writing of your readiness.

In accordance with Title 10 of the Code of Federal Regulations (10 CFR) 2.390 of the NRCs Rules of Practice, a copy of this letter will be available electronically for public inspection in the NRC Public Document Room or from the Publicly Available Records (PARS) component of NRC's Agencywide Documents Access and Management System (ADAMS). ADAMS is accessible from the NRC Web site at http://www.nrc.gov/reading-rm/adams.html (the Public Electronic Reading Room).

Please contact Jason Kozal at 817-200-1144 with any questions you have regarding this letter.

Sincerely,

/RA/

Troy Pruett, Director Division of Reactor Projects Docket No. 50-416 License No. NPF-29

SUNSI Review ADAMS Publicly Available Non-Sensitive By: CHY/dll Yes No Non-Publicly Available Sensitive OFFICE DRP:C/SPE DRP:PBC DRP: D NAME CYoung JKozal TPruett SIGNATURE /RA/MStafford /RA/ /RA/RLantz for for DATE 6/22/17 6/21/17 6/22/17