PNO-I-86-002, on 860109,fire Protection Deluge Sys for Auxiliary Transformer Manually Actuated by Unknown Person at Local Fire Box.Caused by Intentional Act of Tampering or Harassment.Addl Security Patrols Instituted

PNO-I-86-002:on 860109,fire Protection Deluge Sys for Auxiliary Transformer Manually Actuated by Unknown Person at Local Fire Box.Caused by Intentional Act of Tampering or Harassment.Addl Security Patrols Instituted

ML20137G531
Person / Time
Site:	Vermont Yankee
Issue date:	01/14/1986
From:	Meyer G, Raymond W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-86-002, PNO-I-86-2, NUDOCS 8601210073
Download: ML20137G531 (1)

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DCS No: 50271860109 Date: January 14, 1986 PRELIM!NALY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-86-02 This rceliminary notification constitutes EARLY notice of events of POSSIBLE safety or piblic interest significance. The information is as initially received without vert 'ication or evaluation, and is basically all that is known by the Region I staff on this date.

Facility: Licensee Emergency Classification:

Vermont Yankee Nuclear Power Corp. Notification of Unusual Event Vermont Yankee Nuclear Power Station Alert

Vernon, Vermont Site Area Emergency DN 50-271 General Emergency X Not Applicable

Subject:

PROBABLE TAMPERING WITH FIRE DELUGE SYSTEM At 2:40 p.m. January 9, 1986, the fire protection deluge system for the auxiliary transformer was manually actuated by an unknown person at a local fire box. No fire existed. The reactor was defueled for an extended piping replacement outage, and station power was being provided by the startup transformers. No damage to the plant resulted.

The licensee has concluded that the deluge system actuation was an intentional act of ta pering or harassment. The licensee's primary contractor for the recirculation pipe replacement outage had taken a job action against 49 welders within the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period prior to the incident. However, no direct connection between these two events has been established. None of the affected welders were onsite at the time of the actuation.

The licensee has assigned additional security patrols throughout the plant, and has b: gun an investigation. The Vermont State Police are investigating the event.

No other suspicious events have occurred as of noon on January 14.

The State of Vermont has been notified.

CONTACT: W. Raymond G. Meyer 802-257-4319 488-1120 DISTRIBUTIdN:

H. St. MNB0 Phillips E/W Willste Mail: ADM:DMB ChairmaE~PHWdino E00 NRR IE NMSS 00T:Trans only Comm. Zech PA OIA RES Comm. Dernthal ELD AE00 Comm. Roberts Comm. Anselstine 7.,,

ACRS Air Rights INPO ---

SCCY SP NSAC d #

CA POR Regional Offices ~

TMI Resident 'ection A RI Resident Office 6:40 Licensee:

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Region I Form 83 (Rev. January 1986) 0601210073 060114 PDM IAE PNO-I-%-OO2 PDR