ML20042H036

Forwards Safety Evaluation Concluding That Diverse Emergency Feedwater Actuation Sys Designs Acceptable & Meet Requirements of ATWS Rule (10CFR50.62)

ML20042H036
Person / Time
Site:	Arkansas Nuclear
Issue date:	05/01/1990
From:	Poslusny C Office of Nuclear Reactor Regulation
To:	Carns N ARKANSAS POWER & LIGHT CO.
Shared Package
ML20042H037	List: ML20042H036 ML20042H039
References
TAC-59069, NUDOCS 9005170100
Download: ML20042H036 (5)

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i Nif og UNITED STATES

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May-1, 1990

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.Docb. Ho. 50-368 Mr. Heil S. Carns Vice President,-Nuclear

-Arkansas Power and Light Company-P. O. Box 551 Little Rock,- Arkansas. :72203.

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SUBJECT:

-SAFETY' EVALUATION ON'THE ARKANSAS NUCLEAR ONE, UNIT 2

. COMPLIANCE WITH:THE-ATWS RULE, 10 CFR 50.62-DIVERSE

-EMERGENCY FEE 0 WATER ACTUATION SYSTEM'(TAC NO. 59069)

The" ATWS Rule-(10 CFR 50.62,_ "Requirem.nts for! Reduction of Risk from Anticipated y

Transients Without Scram ( ATWS) Events for. Light-Water-Cooled NuclearL Power i

Plants") requires improvements in the design and operation.of commercial nuclear

' power facilities to reduce the. likelihood.of failure to shutdown the reactor-

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following anticipated transients, and to mitigate the consequences of an'ATWS-event.- The requirements for Combustion Engineering: plants'such as Arkansas-i Nuclear-One,: Unit'2(ANO-2)aretoprovideadiversescramsystem(DSS),

diverse auxiliary (DTT).feedwatersystem(DAFW) actuation,:anddiverse-initiation-of turbine-trip-Paragraph (c)(6) of the rule requires that information sufficient to demonstrate compliance with the requirements be submitted to NRR.

a In response to Arkansas Power and Light Company's (AP&L) submittals.~ dated 1

' November 3,(1988,' February 2,-andFebruary 21, 1989, the staff issued a safety n

evaluation SE)onJune'21,1989, addressing the.acceptabilityfof the ANO-2 DSS and DTT designst These ATWS modifications were completed during.the.last refuelingoutageforANO-2L(11/89). The final:ATWS-requirement'for this plant, DAFW or diverse emergency feedn ter actuation system (DEFAS) wasidescribed in=

AP&L's submittal to the staff dated January 15,-1990. The: staff has reviewed this information and as discussed in~the enclosed SE has' concluded that the DEFAS desfgns are acceptable'and meet the requirements of the ATWS rule.

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' As per yt-or January submittal, the DEFAS will be-installed during the ANO eighth refueling outage, currently scheduled to be completed in April 1991~.-

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-2 After installation,:the staff will' conduct a' review of the DEFAS software validation and verification processes and end-to-end procedures as part of an on site implementation audit..

The issuance of this SE' closes TAC No. 59069.

Sincerely, i

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Chester Poslusny, Jr., Project Manager Project Directorate IV

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Division of Reactor Projects. 11 IV,'V, and Special Projects Office of Nuclear Reactor Regulation

Enclosure:

As stated

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.Mr. Neil S. Carns After installation, the staff will con' duct a review of the DEFAS software validation and. verification processes and end-to.end procedures as part of an on site implementation audit.

The issuance of this SE" closes TAC Ho. 59069.

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Chester Posiusny,-Jr., Project Manager.

Project Directorate IV

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IV, V, and Special Projects Office <f Nuclear Reactor Regulation

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After installation, the staff will conduct a review of the DEFAS software validation and verification processes and end-to-end procedures as part of r.e.

on site in.plementation audit.

The issuance of this SE closes TAC No. 59069.

I Sincerely, f

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Chester Posiusny, Jr., Project Manager Project Directorate IV Division.of Reactor Projects - III IV, V, and Special Projects 4-Office of Nuclear ReactorLRegulation

Enclosure:

As stated cc w/ enclosure:

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Mr. Neil S. Carns Arkansas Power & Light Company Arkansas tiuclear One, Unit 2 Cc:

i tir. Early Ewing, General Manager Mr. Charles B. Brinkman, Manager i

Technical Suppo.t and Assessment Washington Nuclear Operations Arkansas Nuclear One Cottbustion Engineering, Inc.

P. O. Box 608.

12300 Twinbrook Parkway, Suite 330 Russellville, Arkansas ~ 72801 Rockville, Maryland P0852 Mr. Jerry Yelverton, Director Nuclear Operations Honorable Joe W. Phillips Arkansas Huclear One County Judge of Pope County P; 0.-Box 608 Pope County Courthouse Russellville, Arkansas 72801 Russellville, Arkansas 72801 Mr. Nicholas S. Reynolds Bishop, Cook, Perce11 & Reynolds 1400 L Street, N.W.

Washington, D.C.

20005-3502 Regional Administrator, Region IV U.S. Nuclear Regulatory Comission

~0ffice of EYecutive Director for Operationn 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 7K11 4

Senior Resident Inspector U.S. Nuclear Regulatory Connission f

1' Nuclear Plant Road l

Russellville, Arkansas 72801 Ms. Greta Dicus, Director Division of Environmental Health

-Protection Arkansas Department of Health 4815 West Markam Street Little Rock, Arkansas 72201 fir. Robert B. Borsum Babcock & Wilcox tluclear Power Generation Division-3 1700 Rockville Pike, Suite 5?S-Rockville, Maryland 20852 l

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