ML19276G942

LER 79-094/03L-0 on 790726:ventilation Stack Particulate Radiation Monitor RM-VG112 Failed & Was Inoperable for 10-h. Caused by Faulty Power Supply.New Power Supply Ordered. Temporary Power Supply Now in Use

ML19276G942
Person / Time
Site:	North Anna
Issue date:	08/24/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19276G938	List: ML19276G937 ML19276G942
References
LER-79-094-03L, LER-79-94-3L, NUDOCS 7908280759
Download: ML19276G942 (2)

Text

NRC FORM 366 - -

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REPORT DATE 80 7 8 60 bl DOCKET NUMBt:R EVENT D ATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES o 2 10n July 26. 1970 durina Mode 1 ocarations. ventil,rin, senck narrienlarn r,r neine I o 3 Imonitor RM-VG112 failed. The detector was inoOerable for acoroximatelv 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />.

o 4 lBecause the ventilation stack aas radiation monitor RM-VGill remained ooarahla and I o S the Environmental Technical Specifications concerninc caseous releases were not I o 6 violated. the health and safety of station narsonn=1 and the general nnhlic were nne 1 0 7 laffected by this event. Reoortable oursuant to T.S. 6.9.1.9.h I o 8 l 80 7 8 9 SYSTEM CAUSE CAUSE COMP. VA LVE CODE CODE SUSCODE COMPON ENT CODE SUSCODE SUBCODE o 9 l Ml cl@ lE lh l A lh I i l N l S l T l R l U lh l_E_jh W h 18 1.4 20 7 8 9 10 11 12 13 SEQUENTI AL nCCURRENCE REPORT REVISION

_ EVENT YE AR REPORT NO. CODE TYPE NO.

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42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o l A faul tv power sucolv caused radiation moni tor RM-VG112 to fail . The Veoco Instrument I

[ g iDepartment ordered a new power supp1v and connected a temocrarv eower sunniv en I i 2 loperate the detector until the new part arrives. I I

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7 8 9 89 ST S  % POWE R OTHER STA TUS ISCOV RY DISCOVERY DESCRIPTION 11 15 I bh l 1l 0 0l@l NA l lAl@l Operator Observation l A C TI VI TY CO TENT RELEASED OF RELE ASE AVOUNT OF ACTIVITY LOCATION OF RELE ASE NA l l1 l6l W @ W @l NA l PERSONNEL E XPOS ES NUMBER TYPE DESCRIPTION ['

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• PE,uCNN A'iNJ ES NUVSER DESCRIPTION NA l1 l a8 l9l 0 l 0 l 011l@l12 7 80

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[?lol ISSUEl @ DESCRIPTION NA [ l 68 69 lllllllllll l 80 5 7 8 9 10 N AME OF PREPARER PHONE: 703-894-5151

Virginia Electric and Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of I Docket No. 50-338 Report No. LER 79-094/03L-0 Description of Event On July 26, 1979, during normal power operation, ventilation stack particulate radiation monitor RM-VG112 failed. The detector was inoperable for approximately 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br />.

Probable Consequences of Occurrence The consequences of this event were limited because ventilation stack gas radia-tion monitor RM-VGil3 remained operable at all times to monitor the vent stack gasses and because the Environmental Technical Specifications were never violated.

As a result, the health and safety of station personnel and the general public were not affected by this event. This equipment is shared by Unit I and Unit 2.

Cause Radiation monitor RM-VGil2 became inoperable as a result of a power supply failure.

Immediate Corrective Action The Vepco Instrument Department ordered a new power supply and connected a temporary power supply to operate the detector until the new parts arrive.

Scheduled Corree;ive Action The Vepco Instrument Department will install the new power supply as soon as they receive it and unit operating conditions permit.

Actions Taken to Prevent. Recurrence No further actions required.

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