ML20065J587

Special Rept 1-94-1:on 940202,pressurizer Pressure Transmitter Swung on Mounting Bolt & Touched Handle of Isolation Valve for Sensing Line,Causing Valve to Open Momentarily.Valve Was Closed & Unit Stabilized

ML20065J587
Person / Time
Site:	Vogtle
Issue date:	04/11/1994
From:	Mccoy C GEORGIA POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
1-94-1, LCV-0332, LCV-332, NUDOCS 9404180302
Download: ML20065J587 (2)

Text

k Georg a Power Company

' '- 40 (nverness Center Prk way Por,t Ofke Box 1295 DirrrUngham, Alabarna 3520 t

,;. Telepham 205 677 7122 m

' c. K. uccoy Georgia Power Vee Prew&nt Ne Vog% Propct the southero electic syC!em LCV-0332 April 11, 1994 Docket No. 50-424 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555 Gentlemen:

VOGTLE ELECTRIC GENERATING PLANT SPECIAL REPORT SAFETY INJECTION ACTUATION REPORT In accordance with the requirements of the Vogtle Electric Generating Plant Technical Specifications, sections 3.5.2 and 6.8.2, Georgia Power Company submits the enclosed special report concerning the actuation of safety injection which occurred on February 2,1994.

Sincerely, 0 $

C. K. McCoy CKM/IIWM

Enclosure:

Special Report xc: Georgia Power Company Mr. J. B. Beasley, Jr.

Mr. o. Sheibani l NORMS l

U. S. Nuclear Reculatory Commission Mr. S. D. Ebneter, Regional Administrator Mr. D. S. Hood, Licensing Project Manager, NRR ,

Mr. B. R. Bonser, Senior Resident Inspector, Vogtle l 94041eo302 940411 4  ;

ADOCK 0500 gDR.

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ENCLOSURE VOGTLE ELECTRIC GENERATING PLANT - UNIT 1 TECHNICAL SPECIFICATION SPECIAL REPORT l-94-1 SAFETY INJECTION ACTUATION REPORT A. REQUIREMENT FOR REPORT This report is required in accordance with the Vogtle Electric Generating Plant Technical Specifications (TS), section 3.5.2, which requires safety injection actuations to be reported to the Commission in a special report pursuant to TS 6.8.2.

B. DESCRIPTION OF EVENT On February 2,1994, personnel were replacing a pressurizer pressure transmitter in the containment building. During the work, the transmitter swung on one ofits mounting bolts and touched the handle of the isolation valve for its sensing line, causing the valve to open enough to momentarily vent pressure from the sensing line. This sensing line is shared with another pressure transmitter. The momentary venting of the sensing line caused the second pressure transmittei to sense a false low pressure, which completed a two out of four logic for initiating a reactor trip and a safety injection (SI) at 0557 EST. Within seconds, the technician performing the work closed the isolation valve.

Control room operators responded to the reactor trip and SI using the emergency operating procedures (EOPs), and the SI signal was reset at 0607 EST. A Notification of Unusual Event (NOUE) was declared at 0610 EST, due to the safety injection of approximately 1500 gallons of borated water into the reactor vessel. The unit was stabilized and normal operation resumed in Mode 3 (hot standby). The NOUE was terminated at 0750 EST.

C. DETAILS OF REPORT The total accumulated actuation cycles tc date is one. The current value of the usage factor for the safety injection nozzles involved is 0.008, which is less than the 0.7 limit for these nozzles.

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