PNO-III-85-065A, on 850729,containment Spray Pump 1B Failed to Start Due to Incorrect Overcurrent Setpoint.Caused by Personnel Error.Licensee Investigation Complete.Erroneous Setpoint Could Have Existed Since 1984 W/No Pump Failures

PNO-III-85-065A:on 850729,containment Spray Pump 1B Failed to Start Due to Incorrect Overcurrent Setpoint.Caused by Personnel Error.Licensee Investigation Complete.Erroneous Setpoint Could Have Existed Since 1984 W/No Pump Failures

ML20133D504
Person / Time
Site:	Callaway
Issue date:	08/01/1985
From:	Chrissotimos N, Creed J, Hind J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
To:
References
PNO-III-85-065A, PNO-III-85-65A, NUDOCS 8508070354
Download: ML20133D504 (1)

b S-PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-III-85-65A Date August 1, 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: Union Electric Company Licensee Emergency Classification:

Callaway Nuclear Plant Notification of an Unusual Event Steedman, M0 65077 Alert Site Area Emergency Docket No: 50-483 General Emergency XX Not Applicable

Subject:

POSSIBLE TAMPERING (FIRST UPDATE)

The licensee has completed its investigation of the possible tampering incident involving the overcurrent relay for the Containment Spray Pump 18 and concluded that tampering was unlikely. The investigation determined there was a plausible explanation for the circumstances surrounding the incorrect overcurrent setpoint.

(The pump failed to start July 29, 1985, and the licensee determined that the setpoint for the overspeed relay was 19.6 amps instead of the normal 40-amp setting.)

The licensee determined that the lead wire seal had been improperly installed (rather than tampered with) and that the damage to the plastic cover of the relay box had been previously reported with a pending work request for its repair.

The improper setpoint was attributed by the licensee as an apparent personnel error which occurred in 1984 when more than 200 relays were set. The pump start range is 10.95 to 21.9 amps, and so the erroneous setpoint could have existed since 1984 with no pump failures.

The Senior Resident Inspector and a region-based security inspector have reviewed the c licensee's investigation and findings with the conclusion that the investigation was thorough and the conclusions appropriate. No further action is planned by Region III (Chicago).

This information will be provided to the State of Missouri.

This updated information is current as of 3 p.m., ugust t 1985.

CONTACT: J.

.Deed J.

h ind hh N.

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