ML20012E897

Submits Results of Evaluation of Util 900414 Response to Station Blackout Rule (10CFR50.63).Station Mod May Be Required to Change Starting Air Sys to Accomodate Compressed Bottled Air

ML20012E897
Person / Time
Site:	Waterford
Issue date:	03/30/1990
From:	Burski R LOUISIANA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
W3P90-0673, W3P90-673, NUDOCS 9004090020
Download: ML20012E897 (3)

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.M' ~. c tou6elevin Powet & Ught Coenpany 317 Daro.wa Stroot P. O. Dos 60340 t

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' '" R. F. Burski NW:19ar Saloty & hod'Aal0'y Aftairs.

i Manager t' 1 V3P90-0673

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p March 30, 1990  :

j U.S. Nuclear Regulatory Commission ,

i . Attn Document Control Desk ,

, i Washington, D.C. 20555 i

Subject:

Waterford 3 SES 1 DetSet N6. 50 4 i '

.I i Station BlacV e (SBO)

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f C.intlement .

,. LP&L on April 14, 1989 submitted the response for Waterford 3 to the *

{' station blackout rule 10CFR50.63, ref-rence one (1). Subsequently, NUMARC

.o,.tanuary 4, 1990, reference two (2), issued a letter to the industry L identifying tesues requiring evaluation. The following information provides the results of our evaluation. [

L 1. The infoimation provided in the April 14, 1989 LP&L response was based on NUMARC 87-00 and remains valid. There are no changes to e the Waterford 3 S110 categories and classifications documented in i reference one. .i

2. Pursuant to NUMARC 87-00, section 3.2.1, part 1.B. method A, sita l specific data was used in calculating the estimated frequency of a loss of off-sfte power due to extremely severe weather. The ,

methodology and data in NUREG/CR-2639, May 1982, was used. LP&L l

also supplemented the data in NUREG/CR-2639 witn tornado data from ,

I the National Oceanic and Atmospheric Administration and eniculated [

the annual expectation of tornadoes.

3. The original anilysis assumed that at the end of the postulated SBO, >

power was rest.ored to the shutdown buses from of f-site AC power. LP&L i E is in the process of modifying emergency operations procedure p .0P-902-005 to include the restoration of the emergency diesel generators as part of the recovery process. Provisions need to be i b'

made to have bottled compressed air stored on-site and available for j the emergency diesel generctors. A station modification may be ,

' required to change the starting air system to accommodate the  !

coupressed bottled air. This effort will be completed by April 17, 1991 purousut to paragraph c(4) of 10CFR 50.63. '

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W3P90-0673 l

' Docket No. 50-382 '

i Station Blackout (SBO) i March 30, 1990 Pa'ge 2

4. The LP&L document for SBO, calculation EC-E89-016, was revised. The revision was made to enhance the existing SB0 analyses and evaluations or to validate certain assumptions. The analysis which is required to confirm the LOCA is.the bounding containment heat-up event compared with an SB0 is in the process of being finalized. The documentation of the analysis, which includes computer analysis, will be finalized-by April 16, 1990.

5. LP&L affirms its understanding that the diesel generator target reliability for Waterford 3, 0.975, 18 to be maintained, o LP&L recognizes the importance of' station blackout. . A significant effort has been made to assure there is comprehensive and well supported documentation for SBO. We believe the Waterford 3 evaluation thoroughly addresses the current issues' on SBO.

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RFB/RJM/smb Attachment cct ' Messrs. R.D. Martin s F.J. Hebdon D.L. Wigginton e

E.L. Blake W.M. Stevenson W-3 NRC Resident inspector's Office a:

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