ML19329A764

Responds to Util Re 740104 Incident Resulting in Isolation of 230 Kv Switchyard.Requires Submittal of Safety Evaluation Prior to Installation of Modified Breaker Failure Relay Circuits from Transformer Lockout Relays

ML19329A764
Person / Time
Site:	Oconee
Issue date:	01/21/1974
From:	Moore V US ATOMIC ENERGY COMMISSION (AEC)
To:	Thies A DUKE POWER CO.
References
NUDOCS 8001090760
Download: ML19329A764 (1)

Text

.

1 O

DISTRIBUTION:

JAN 21574 AEC PDR DVassallo

_ pcal PDR JStolz

.L Dockat IIos. 5 269 Leockets (3)

WButler w 270 LWR 2-3 Rdg (3) 5 extra cps VAMoore RPollard, RO and 50.-287 JHendrie

" Thomas, RO AKenneke BPollus, RO DEisenhut Duke Power Company RWKlecker ATTN: Mr. Austin C. Thies OGC f

S*niar Vice President, Production and Tran=4=sion RO (3) 422 South Church Street IAPeltier EIGoulbourne P. O. Box 2178 TR AD's Charlotte, H. C.

28201 ACRS (16)

ASchwencer g,gy KGoller f

We have reviewed your letter of January 14,19749BhNding the int ident which resulted in the isolation of the 230 Kv switchyard at the Cconee l

Nuc1 car Station en January 4,1974. Based upon this letter and our dis:ussions with you, we agree that the proposed code of operation of the switchyard does not involve any unreviewed cafety catter.

Because of the nature of the condition which resultad in the breaker failure relays isolating the 230 Kv switchyard, you should provide us with your safety evaluation prior to insen1147g the cocified breaker failure relay circuits fron the transformer lockout relays. Your safety evaluation should include any additional surveillance and testing not j

nou required by the Technical Specifications to assure proper operation of the switchyard with regard to establishing the Keowee overhead line I

to the Oconee Station startup transformers when required.

t It is our understanding that to the best of your knowledge there are no other syste=s 'inich could generate a switchyard isolation logic sf pm1 as a consequence of spurious signals or faulty logic.

Please provide us with your schedule for installing the modified system.

Sincerely, Original Signed 1

i Voss A. Moore, Assistant Director l

for Light Uater Reactors No. 2 Direcrorate of Licensing

~ ~

l l

cc: William L. Porter Duke Power Cocpany kO. Zu 178, _

gjg,),y,g, ;,;,g, g,c f,g j74 4

.~ a

v.. - m. -

Charlotte,'!. C.

28201 LWR 2,73 _,,_ _L;gg]

L:C/ LWR 2-3 L:

1

.mc.,

IAPelt' :kmf.RPollab ASchNncer

'V ore D l

..1/.16/ 74

,1[,,y

/74 L/,f

/74 1//[/74 ov*

l l

rar= uc.m <an. 9.m ac.w om eu 8 0 010 90 7dO 8!