ML041480142
| ML041480142 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 05/20/2004 |
| From: | Warner M Florida Power & Light Energy Seabrook |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NYN-04045 | |
| Download: ML041480142 (4) | |
Text
FPL Energy Seabrook Station FPL Energy Seabrook Station I
P.O.
Box 300 Seabrook, NH 03874 (603) 773-7000 MAY 2 0 2004 Docket No. 50-443 NYN-04045 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555-0001
References:
FPLE Seabrook Letter NYN-03069, Seabrook Station License Amendment Request 03-0 l,"Changes to Electrical Power Systems - A.C. Sources Technical Specifications - Inclusion of the Supplemental Emergency Power System," dated August 25, 2003.
Seabrook Station Response to Request for Additional Information Regarding License Amendment Request 03-01 FPL Energy Seabrook, LLC (FPLE Seabrook) has enclosed herein its response to a request for additional information associated with License Amendment Request (LAR) 03-01. The additional information provides clarity with regards to the decrease in risk associated with FPLE Seabrook's planned installation of a permanent non safety-related supplemental emergency power system (SEPS).
The results of the probabilistic risk assessment performed to quantitatively assess the risk impact when one EDG is out of service with the SEPS available indicate a significant decrease in core damage frequency (CDF) by up to 30 percent.
Should you have any questions concerning this response, please contact Mr. James M. Peschel, Regulatory Programs Manager, at (603) 773-7194.
Very truly yours, FPL Energy Seabrook, LLC MariE. Warner Site Vice President AL)Dj an FPL Group company
U. S. Nuclear Regulatory Commission NYN-04045/Page 2 cc:
H. J. Miller, NRC Region I Administrator V. Nerses, NRC Project Manager, Project Directorate 1-2 G. T. Dentel, NRC Senior Resident Inspector Mr. Bruce Cheney, Director New Hampshire Office of Emergency Management State Office Park South 107 Pleasant Street Concord, NH 03301 OATH AND AFFIRMATION I, Mark E. Warner, Site Vice President of FPL Energy Seabrook, LLC, hereby affirm that the information and statements contained within this response to the Request for Additional Information to License Amendment Request 03-01 are based on facts and circumstances which are true and accurate to the best of my knowledge and belief.
Sworn and Subscribed before rre this 1
bday of mj\\a-2004 icTMark.Wamer Site Vice President Notary Public-
- - -------EnclosuretoNYN-04045
Response to Request for Additional Information Seabrook Station, Unit No. 1 RAI: In the table at the top of page 22 of section 1 of the August 25, 2003 submittal, the base case (baseline) risk calculations are for a 3-day Allowed Outage Time (AOT) with no SEPS.
Submit new baseline risk calculations (Revise Case number 1: "3-day AOT with the SEPS with normal expected unavailabilities.") which will determine the net effect on risk of the proposed 14-day EDGs AOT of the Delta Core Damage Frequency and delta Large Early Release Frequency.
Response
New-case I a is presented below.--The case presents risk calculations for a day AOT with the Supplemental Emergency Power System and normal expected unavailabilities. Consistent with the methodology in the LAR, the new case is compared to case 3 for determining ACDF and ALERF.
Case Description CDF CDF CDF LERF Number Mode 1,2,3 Mode 4,5,6 Mode 1-6 Mode 1,2,3 la 3-day AOT with the SEPS with 2.94E-05 1.82E-05 4.76E-05 9.66E-08 normal expected unavailabilites.
N/A ACDF and ALERF 1.90E-6
-1.90E-6*
2.00E-7 9.00E-10
= Case 3 - Case I a
- Note: The Mode 4,5,6 ACDF is negative because the Case 3 model does not include planned unavailability for the existing Emergency Diesel Generators (EDG) during modes 4,5,6. If a 14 day AOT is granted, preventive maintenance for the EDGs will generally not be performed during shutdown.