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

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~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-.

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~o 7 diesel enerator started automaticall and rovided shutdown power

~o 3 off-site power was restored.

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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.

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