PNO-III-85-061, on 850713,reactor Trip Occurred Along W/Loss of Some Instrumentation.Caused by Lightning Strike Near Facility.Methodology Used to Ground Lightning Reviewed.Sys Being Modified to Preclude Recurrence

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PNO-III-85-061:on 850713,reactor Trip Occurred Along W/Loss of Some Instrumentation.Caused by Lightning Strike Near Facility.Methodology Used to Ground Lightning Reviewed.Sys Being Modified to Preclude Recurrence
ML20128N678
Person / Time
Site: Byron Constellation icon.png
Issue date: 07/19/1985
From: Forney W, Greenman E
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-85-061, PNO-III-85-61, NUDOCS 8507260250
Download: ML20128N678 (1)
v • d • e


PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-85-61 Date July 19, 1985 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without veri-fication or evaluation, and is basically all that is known by the staff on this date.

Facility: Commonwealth Edison Company Licensee Emergency Classification:

Byron Unit 1 Notification of an Unusual Event Byron, IL 61010 Alert /

f/

Site Area Emergency Docket No: 50-454 General Emergency XX Not Applicable

Subject:

LIGHTENING STRIKE AFFECTS INSTRUMENTATION, COMPONENTS At 4:39 a.m. (CDT), July 13, 1985, while in the process of shutting down because of a control rod problem, a lightening strike in the vicinity of the plant caused a reactor trip and the loss of some instrumentation.

A detailed examination by the licensee subsequently determined that 47 components were affected by the lightening, including security and meteorological equipment and reactor protection instrumentation.

The licensee has reviewed the methodology used to ground lightening and is in the rpocess of modifying the system to preclude a reoccurrence of this event. This is expected to be completed by July 20. (The unit is currently in cold shutdown.)

The resident inspectors are following the licensee's course of action.

The State of Illinois will be notified.

Region III was first notified of this event about 7 a.m. (CDT), July 13, 1985. This information is current as of July 19, 1985.

O'T CONTACT: W." Forney E. Greenman FTS 388-5590 FTS 388-5518 DISTRIBUTI N:

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