ML20211Q009
| ML20211Q009 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 09/08/1999 |
| From: | Sekerak S NRC (Affiliation Not Assigned) |
| To: | Eaton W ENTERGY OPERATIONS, INC. |
| References | |
| GL-88-20, TAC-M83625, NUDOCS 9909140162 | |
| Download: ML20211Q009 (3) | |
Text
Mr. William A. Eaton Vice Pr;sident, Oper;tions GGNS September 8, 1999 Ent:rgy Oper:tions, Inc.
P. O. Box 756 Port Gibson, MS 39150
SUBJECT:
GRAND GULF NUCLEAR STATION, UNIT 1 - REQUEST FOR ADDITIONAL INFORMATION RE: INDIVIDUAL PLANT EXAMINATION OF EXTERNAL EVENTS SUBMITTAL (TAC NO. M83625)
REFERENCE:
- 1. Entergy Operations, Inc., letter (GNRO-98/00012) from W.K. Hughey to the USNRC, dated February 10,1998.
- 2. Electric Power Research Institute (EPRI) Report " Guidance for Development of Response to Generic Request for Additional Information on Fire Individual Plant Examination for External Events (IPEEE)," dated May 1999.
Dear Mr. Eaton:
The staff has reviewed your response (Ref.1) to our previous request for additional information (RAI) on the IPEEE, Generic Letter (GL) 88-20, Supplement 4, dated June 28, 1991. Based upon its review of your response, the staff is unable to conclude at this time that you have met the intent of Supplement 4 to GL 88-20. Therefore, your response to the enclosed follow-up questions, considering the recently developed EPRI guidance provided in Reference 2, is necessary in order to complete the staff's review.
It is requested that you provide a response to the enclosed RAI by June 15,2000. This response date was discussed with Mr. Jerry Burford of your staff on August 24,1999, who indicated that Entergy will be able to meet this date. The staff appreciates the efforts expended with respect to this matter.
Sincerely, ist S. Patrick Sekerak, Project Manager, Section 1 Project Directorate IV & Decommissioning Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-416
Enclosure:
As stated j
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Grand Gulf Nuc!aar Station cc:
Executive Vice President Attomey General
& Chief Operating Officer Department of Justice Entergy Operations, Inc.
State of Louisiana P. O. Box 31995 P. O. Box 94005 Jackson, MS 39286-1995 Baton Rouge, LA 70804-9005 Wise, Carter, Child & Caraway State Health Officer P. O. Box 651-State Board of Health
' Jackson, MS 39205 :
P. O. Box 1700 l
Jackson, MS 39205 Winston & Strawn
- 1400 L Street, N.W. - 12th Fioor Office of the Governor Washington, DC 20005-3502 State of Mississippi Jackson, MS 39201 Director Division of Solid Waste Management Attorney General Mississippi Department of Natural Asst. Attomey General Resources State of Mississippi P. O. Box 10385 P. O. Box 22947 Jackson, MS 39209 Jackson, MS 39225 President Vice President, Operations Support Claiborne County Board of Supervisors Entergy Operations, Inc.
P. O. Box 339 P.O. Box 31995 Port Gibson, MS 39150 Jackson, MS 39286-1995 j
Rsglonal Administrator, Region IV Director, Nuclear Safety U.S. Nuclear Regulatory Commission and Regulatory Affairs 611 Ryan Plaza Drive, Suite 1000 Entergy Operations, Inc.
Arlington,TX 76011 P.O. Box 756 j
Port Gibson, MS 39150 Senior Resident inspector U. S. Nuclear Regulatory Commission P. O. Box 399 Port Gibson, MS 39150 i
General Manager, GGNS Entergy Operations, Inc.
P. O. Box 756 Port Gibson, MS 39150 May 1999 l
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l Grand Gulf Nuclear Statian (GGNSL Unit 1
~ Suoolemental Reauest for Additional Information
Reference:
- 1.. Entergy Operations, Inc., letter (GNRO-98/00012) from W.K. Hughey to the USNRC, dated February 10,1998, 2.
Electric Power Research Institute (EPRI) Report " Guidance for Development of Response to Generic Request for Additional Information on Fire Individual Plant Examination for Extemal Events (IPEEE)," dated May 1999.
Based on your Individual Plant Examination for Extsmal Events (IPEEE) submittal and the February 10,1998 (Ref.1), response to requests for additional information (RAls) for the GGNS IPEEE, the staff is unable to conclude at this time that you have met the intent of Supplement 4 to Generic Letter 88-20. Your response to the following fire risk analysis RAls (follow-up to previous RAls) is necessary in order to complete our review.
1.
The Reference 1 response to RAI Question 4 relating to the assumed heat release rates (HRRs) from electrical cabinet fires reiterated information provided in the nbmittal and/or traceable to the Electric Power Research Institute (EPRI) Fire PRA [probaoilistic risk assessment) Implementation Guide, without responding to the original RAl New EPRI guidance included in Reference 2 should be helpfulin formulating a new response. The new guidance provides specific recommendations for higher values of HRRs for electrical
. control cabinets, which may alter the conclusions based on the damage expected from postulated cabinet fires. Please consider the new guidance and submit a revised response to the original question.
2.
The Reference 1 response to RAI Question 6 discussed the assumed heat loss factor (HLF) that was used in the GGNS lPEEE analysis. New EPRI guidance on this subject is included in Reference 2, and should be helpful in formulating a new response to this question. The new EPRI guidance provides recommendations for use of lower values of HLF in determining the effects of hot gas layers. Thus, hot gas layer damage may become a more significant contributor to the fire-induced core damage frequency.
Previous conclusions should be re-examined given the new guidance. Please consider the new guidance and submit a revised response to the original question.
Seismic events There are no RAls in this area.
Hiah wind. floods and other external events There are no RAls in this area.
Enclosure
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