ML17339A567

LER 78-017/03L-0:on 780514,improper Switching at Pratt & Whitney Substation & Incorrect Wiring of Protective Relays at Midway Substation Led to de-energization.Offsite Power Lost.Incorrect Wiring Corrected

ML17339A567
Person / Time
Site:	Saint Lucie, Turkey Point
Issue date:	06/13/1978
From:	Schoppman M FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17207A819	List: ML17207A818 ML17339A563 ML17339A565 ML17339A567 ML17339A569 ML17339A571 ML17339A572 ML17339A574 ML17339A575 ML17339A576 ML17339A577
References
LER-78-017-03L-02, LER-78-17-3L-2, NUDOCS 8002150482
Download: ML17339A567 (2)

Text

NRC FOR%I 366U U S NUC~vR RZGUKATORY COIJIMISSIQN P 77l LlCEINSEE EVEIMT RePORT

" "'"*"LJ I

' '

'0 CP~KPRINT CA TYPc I 'KCUIRZDIHPORAIATIOH)

IQ~Q

~ 5 IQ

~~'

t t I I'I

~O 3 Uc vsze cooe II I I I I UCSI>>$ e AVAI$4R I I !Ql 5 I I I

~C 'iSZ iYPS I

JO Si CAC

~O CON T SO

'0 SI

'

COCK>> ~ AV'4$ ZR

'

Sil >>I ZV >>PeTOA-,S Ut~i' IS I

A>>&JET OATS SO cV6NTOGSCAIPTICN ANO rrIOB*BL= CONS=Cue>>IC-6 OIO Im ro er svitchin at the Pratt 6 Whitney Substation, combined with

~43 incorrect wirin of rotective rela s at the M.dvay Substation, led ta

~oil the deener zation of the Midva .Substation. This resulted in the loss

~o 6 of off-site over to the St. Lucie Plant for about 8-1/4 minutes. One on-site diesel generator was out of service for maintenance. The remain-.

until

~o 7 diesel enerator started automaticall and rovided shutdown power

~o 3 off-site power was restored.

7 IUU 7 S 3 9 SVS.ZU C OZ LIILJIQ 9 IO CAVSZ cocs I>>4 II CAI:SZ

$ USccoe LUS l2 cc>>>>poyzpITcoolk SZOVZVTIAI.

IUUJJ l3

'0 IS OCCVR+ZNCZ CC>>PP.

SV3="OS LJQ Ig AZPOrlT Vu.vs

. SVSCOCS LJQ RZVISIO>>I

'IO 0";

I rRIAO

~g '2~

ZVZPITVZAR 12 24 RZPOAT "IO,

~Oi I 24

~~

27

~OS 23 CON 29 TVPe

~t A ~

I PI

~O 0.

ACTION PVTVRZ .

TAICSII LU>>LUS CAUS A,I 34 V

ZPPZw CAP'l LJQ UZI>>

SMVTOOv>>>>I

'VZTMCO 06SCRl~ioiri Aivn COARSCTIVS ACTIOJVJS

~tt'IJQ Q2>>

MOURS Q ATTACI4VZPIT SVSIUilTTZO 4I V>>RE PC>IP~

Prie>>~P, L'UQ. ML'0'JILULL SVP>>UZR 44 CCLVPONZiVT

'VAiIUPA VASA 41,%

The cause'was improper switching at the Pratt 6 Whitney Substati'on com-bined with incorrect wirin of both 240/138 kV autotransformer polarizing CT circuits at the Midva Substation. The incorrect wiring has been corrected, and a ro riate personnel have been advised of the cause and corrective action for this occurrence.

3 9 FACIU,Y Si ATUS .I PO'RZR CTMZRsTAlis ~ >>457I COOP CIsccvzlv

'0 OI~ZRVOZ~PTIOv OS2 UUU UUS '14UIULUUS~N l2 IS I Observation 7 3 5 ACTIVITV CcyT>>VT AZI.Z*SZO OI'ZlZASZ A4IOVIITOFACAVITV026 tccATIoy or RZIRAsz 026 EZ Lu0 LZIQZ IO NA 44 45 NA P>SOyy Zt. ZXPOSVASS

'I:j Q Ujl i~@>>LZJQm 5 II I2 'S NA PSRSCVVSV IVIVRIZS vtSVSZR OZSCRIPncyO I

7 jg ~i~SQO II I2 NA vc$ $ or OR oA>>pAcz To p~qtITv

,VPZ 053&IPTIOy Q EK LZJC2 7 3 7 IO NA

'I SO PVZI.ICI~

ISSVZO OSSCRIPI Cy Q NRC USc CPII.Y KEI I 3 LtL',Q 2 ~

4 NA 53 53 SO NAS'C OF'PocPARcR N. A. Schn man , . 305/552-3802