PNO-V-85-052, on 850805 & 08,breaker Power Switches on Control Element Drive Mechanism Panels Found Closed.Two 13.8 Kv Electrical Breaker Incidents Under Licensee Review to Determine If Tampering Involved

PNO-V-85-052:on 850805 & 08,breaker Power Switches on Control Element Drive Mechanism Panels Found Closed.Two 13.8 Kv Electrical Breaker Incidents Under Licensee Review to Determine If Tampering Involved

ML20134D739
Person / Time
Site:	Palo Verde
Issue date:	08/12/1985
From:	Miller L, Zimmerman R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
To:
References
PNO-V-85-052, PNO-V-85-52, NUDOCS 8508190340
Download: ML20134D739 (1)

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. PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V-85-52 Date: 08/12/85 This preliminary notification constitutes EARLY not ce i of events'.of POSSIBLE safety or public

intcrest significance. The information presented;isas initially received without verification or svaluation and is basically all that is known by Region.V staff on this date.

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- FACILITY: Arizona Nuclear Power Project Emergency Classification Palo Verde Unit 2 Notification of Unusual Event Docket No. 50-529 ( . Alert Site Area Emergency Ceneral Emergency {

XX Not' Applicable \

SUBJECT:

POTENTIAL UNAUTHORIZED OPERATION OF EQUIPMENT On' August 5, 1985, a contract startup engineer performing preoperational testing on Unit-2, '

fcund five breaker power switches on the control element drive mechanism panels in other thin the expected condition (switches were found closed). He returned the switches to the cpan position assuming the switches had been closed accidentally. On August 8, at about

~2:15 pm, another contract startup_ engineer reported that 21 similar switches had been found in the closed position. Preliminary investigation by the licensee revealed that the panels hid been checked by startup engineering on August 6 as part of a system walkdown, and the s Twitches were open at that time.

= Additionally, two recent incidents associated with two 13.8 KV electrical breakers at Unit 3~cre also under licensee review to determine whether the events indicate poor maintenance prrctices, construction mischief, or possible tampering.

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.The licensee is currently conducting an investigation of the above events. The resident inspector is monitoring the licensee's' actions.

. Licensee investigation into previous potential tampering events (reported in PNO-V-85-41 and PNO-V-85-50) have been inconclusive, to date, in determining whether the reported

. incidents were accidental or purposeful in nature.

The licensee has notified local media.

This information is current as of 10:30 am (PDT), August 12, 1985.

. CONTACT: L. Miller R. Zimmerman FTS 463-3869 (602) 386-5260

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CA- (Reactor Licensees) REGION V: FORM 211 PDR Resident Inspector 1V#/ (Revised 3/14/83)

Y 8508190340 850812 PDR 18cE PNO-V-85-052 PDR

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