ML071080162

Response to Generic Letter 2006-02, Grid Reliability and the Impact on Plant Risk and the Operability of Offsite Power

ML071080162
Person / Time
Site:	River Bend
Issue date:	04/30/2007
From:	Bhalchandra Vaidya NRC/NRR/ADRO/DORL/LPLIV
To:	Venable J Entergy Operations
Vaidya B, NRR/DORL/LP4, 415-3308
References
GL-06-002, RG-1.155, TAC MD1024
Download: ML071080162 (4)

Text

April 30, 2007 Mr. Joseph E. Venable Vice President of Operations Entergy Operations, Inc.

River Bend Station 5485 US Highway 61N St. Francisville, LA 70775

SUBJECT:

RIVER BEND STATION, UNIT 1- RESPONSE TO GENERIC LETTER 2006-02, GRID RELIABILITY AND THE IMPACT ON PLANT RISK AND THE OPERABILITY OF OFFSITE POWER (TAC NO. MD1024 )

Dear Mr. Venable:

On February 1, 2006, the U.S. Nuclear Regulatory Commission (NRC) issued Generic Letter (GL) 2006-02, Grid Reliability and the Impact on Plant Risk and the Operability of Offsite Power (Agencywide Documents Access and Management System (ADAMS) Accession No. ML060180352), to all holders of operating licenses for nuclear power reactors except those who have permanently ceased operation and have certified that fuel has been removed from the reactor vessel.

GL 2006-02 notified licensees of the NRC staffs need for information in four areas as follows:

(1) use of protocols between the nuclear power plant (NPP) and the transmission system operator (TSO), independent system operator (ISO), or reliability coordinator/authority (RC/RA) and the use of transmission load flow analysis tools (analysis tools) by TSOs to assist NPPs in monitoring grid conditions to determine the operability of offsite power systems under plant technical specifications (TSs). (The TSO, ISO, or RA/RC is responsible for preserving the reliability of the local transmission system. In this GL, the term TSO is used to denote these entities.);

(2) use of NPP/TSO protocols and analysis tools by TSOs to assist NPPs in monitoring grid conditions for consideration in maintenance risk assessments; (3) offsite power restoration procedures in accordance with Section 2 of NRC Regulatory Guide (RG) 1.155, Station Blackout; and (4) losses of offsite power caused by grid failures at a frequency equal to or greater than once in 20 site-years in accordance with RG 1.155.

Subsequent to the GL, the NRC issued a Request for Additional Information (RAI) (ADAMS Accession No. ML063380308), regarding the resolution of GL 2006-02 to 63 of 65 holders of

J. Venable operating licenses for nuclear power reactors. The RAI requested that licensees respond to questions in the following areas:

(1) Switchyard Minimum Voltage; (2) Loss of Real-Time Contingency Analysis (RTCA) Capability; (3) Verification of RTCA Predicted Post-Trip Voltage; (4) Identification of Applicable Single Contingencies; (5) Seasonal Variation in Grid Stress (reliability and Loss-of-offsite power (LOOP)

Probability; and (6) Interface With Transmission System Operator During Extended Plant Maintenance.

By letter dated April 3, 2006 (ADAMS Accession No. ML061000256), as supplemented by letter dated January 31, 2007 (ADAMS Accession No. ML070370584), you responded to the information request of GL 2006-02 and the subsequent RAI. Based on the information you provided, the staff has concluded that compliance is being maintained with NRC regulatory requirements governing electric power sources and associated personnel training and considers your response to GL 2006-02 complete.

If you have any questions, please contact me 301-415-3308.

Sincerely,

/RA/

Bhalchandra Vaidya, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-458 cc: See next page

ML061000256), as supplemented by letter dated January 31, 2007 (ADAMS Accession No. ML070370584), you responded to the information request of GL 2006-02 and the subsequent RAI. Based on the information you provided, the staff has concluded that compliance is being maintained with NRC regulatory requirements governing electric power sources and associated personnel training and considers your response to GL 2006-02 complete.

If you have any questions, please contact me 301-415-3308.

Sincerely,

/RA Bhalchandra Vaidya, Project Manager Plant Licensing Branch IV Division of Operating Reactor Licensing Office of Nuclear Reactor Regulation Docket No. 50-458 cc: See next page DISTRIBUTION:

PUBLIC RidsNrrPMBVaidya LPLIV r/f RidsNrrLAJBurkhardt RidsAcrsAcnwMailCenter RidsOgcRp RidsNrrDeEeeb (GWilson) RidsRgn4MailCenter RidsNrrDorlLpl4 JRobinson, PGCB RidsNrrDprPgcb (CJackson)

ADAMS Accession No: ML071080162 OFFICE NRR/LPL4/PM NRR/LPL4/LA NRR/EEEB/BC NRR/PGCB/BC NRR/LPL4/BC NAME BVaidya JBurkhardt GWilson CJackson THiltz DATE 4/20/07 4/20/07 4/30/07 4/26/07 4/30/07 River Bend Station cc:

Manager, Licensing General Manager Plant Operations Entergy Operations, Inc. Entergy Operations, Inc.

River Bend Station River Bend Station 5485 US Highway 61N 5485 US Highway 61N St. Francisville, LA 70775 St. Francisville, LA 70775 Director, Nuclear Safety & Licensing Director, Nuclear Safety Assurance Entergy Operations, Inc. Entergy Operations, Inc.

1340 Echelon Parkway River Bend Station Jackson, MS 39213-8298 5485 US Highway 61N St. Francisville, LA 70775 Louisiana Department of Environmental Quality Vice President, Operations Support Radiological Emergency Planning and Entergy Operations, Inc.

Response Division P.O. Box 31995 P.O. Box 4312 Jackson, MS 39286-1995 Baton Rouge, LA 70821-4312 Mr. Jim Calloway Louisiana Department of Environmental Public Utility Quality Commission of Texas Office of Environmental Compliance 1701 N. Congress Avenue P.O. Box 4312 Austin, TX 78711-3326 Baton Rouge, LA 70821-4312 Attorney General Senior Resident Inspector State of Louisiana P.O. Box 1050 P.O. Box 94095 St. Francisville, LA 70775 Baton Rouge, LA 70804-9095 President of West Feliciana Brian Almon Police Jury Public Utility Commission P.O. Box 1921 William B. Travis Building St. Francisville, LA 70775 P.O. Box 13326 1701 North Congress Avenue Regional Administrator, Region IV Austin, Texas 78701-3326 U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Richard Penrod, Senior Environmental Arlington, TX 76011-8064 Scientist/State Liaison Officer Office of Environmental Services Ms. H. Anne Plettinger Northwestern State University 3456 Villa Rose Drive Russsell Hall, Room 201 Baton Rouge, LA 70806 Natchitoches, LA 71497 Executive Vice President and Chief Operating Officer Entergy Operations, Inc.

P.O. Box 31995 Jackson, MS 39286-1995 November 2006