ML063200384
| ML063200384 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 12/05/2006 |
| From: | Bhalchandra Vaidya NRC/NRR/ADRO/DORL/LPLIV |
| To: | Brian W Entergy Operations |
| Vaidya B, NRR/DORL/LP4, 415-3308 | |
| Shared Package | |
| ML063210035 | List: |
| References | |
| Download: ML063200384 (4) | |
Text
December 5, 2006 Mr. William R. Brian Vice President of Operations Grand Gulf Nuclear Station Entergy Operations, Inc.
P.O. Box 756 Port Gibson, MS 39150
SUBJECT:
GRAND GULF NUCLEAR STATION, UNIT 1 - RE: FINAL ACCIDENT SEQUENCE PRECURSOR ANALYSIS OF APRIL 2003 OPERATIONAL EVENT, LER 416/03-002
Dear Mr. Brian:
Enclosed are the final results of the Accident Sequence Precursor (ASP) analyses of an event which occurred at Grand Gulf Nuclear Station, Unit 1 (GGNS), as documented in Licensee Event Report (LER) 416/03-002. The subject event occurred on April 14, 2003, during which GGNS experienced an automatic reactor scram due to loss of offsite power with the condenser vacuum pump inoperable and subsequent failure of instrument air, and was reported in LER 416/03-002. The ASP analysis (Agencywide Documents Access and Management System (ADAMS) Accession No. ML062710045) calculated a mean conditional core damage probability of 1.3 x 10-6. The final ASP analyses were previously sent to the licensee and the Office of Nuclear Reactor Regulation (NRR) staff for review. NRR and licensee comments have been addressed in the enclosed analyses.
The Nuclear Regulatory Commission (NRC) established the ASP Program in 1979 in response to the Risk Assessment Review Group report (see NUREG/CR-0400, dated September 1978).
The ASP Program systematically evaluates U.S. nuclear power plant operating experience to identify, document, and rank the operating events that were most likely to have led to inadequate core cooling and severe core damage (precursors), accounting for the likelihood of additional failures.
The ASP Program has the following objectives:
Provide a measure for trending nuclear power plant core damage risk.
Provide a partial check on dominant core damage scenarios predicted by probabilistic risk assessments.
Provide feedback to regulatory activities.
Evaluate the adequacy of NRC programs.
The NRC also uses the ASP Program to monitor performance against the safety goal established in the agency's Strategic Plan (See NUREG-1100, Vol. 21, dated February 2005).
W. Brian For more information about the ASP Program, see the annual ASP Program Report at http://www.nrc.gov/reading-rm/doc-collections/commission/secys/2005/secy2005-0192/2005-01 92scy.pdf.
The enclosure is provided for your information and no response is requested.
If you have any questions, please contact me at 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. 50-416
Enclosure:
Final ASP Analysis cc w/encl: See next page
Pkg ML063210035 (Letter ML063200384, Enclosure ML062710045)
OFFICE NRR/LPLIV/PM NRR/LPLIV/LA RES/DRASP/D NRR/LPLIV/BC NAME BVaidya LFeizollahi FEltawila DTerao DATE 11/28/06 11/27/06 11/1/06 11/30/06
November 2006 Grand Gulf Nuclear Station cc:
Executive Vice President
& Chief Operating Officer Entergy Operations, Inc.
P.O. Box 31995 Jackson, MS 39286-1995 Chief Energy and Transportation Branch Environmental Compliance and Enforcement Division Mississippi Department of Environmental Quality P.O. Box 10385 Jackson, MS 39289-0385 President Claiborne County Board of Supervisors P.O. Box 339 Port Gibson, MS 39150 Regional Administrator, Region IV U.S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, TX 76011-8064 Senior Resident Inspector U.S. Nuclear Regulatory Commission P.O. Box 399 Port Gibson, MS 39150 General Plant Manager Operations Entergy Operations, Inc.
P.O. Box 756 Port Gibson, MS 39150 Attorney General Department of Justice State of Louisiana P.O. Box 94005 Baton Rouge, LA 70804-9005 State Health Officer State Board of Health P.O. Box 139 Jackson, MS 39205 Office of the Governor State of Mississippi Jackson, MS 39201 Attorney General Asst. Attorney General State of Mississippi P.O. Box 22947 Jackson, MS 39225-2947 Vice President, Operations Support Entergy Operations, Inc.
P.O. Box 31995 Jackson, MS 39286-1995 Director Nuclear Safety Assurance Entergy Operations, Inc.
P.O. Box 756 Port Gibson, MS 39150 Director Nuclear Safety & Licensing Entergy Operations, Inc.
1340 Echelon Parkway Jackson, MS 39213-8298 Manager, Licensing Entergy Operations, Inc.
P.O. Box 756 Port Gibson, MS 39150 Richard Penrod, Senior Environmental Scientist/State Liaison Officer Office of Environmental Services Northwestern State University Russsell Hall, Room 201 Natchitoches, LA 71497