ML19276G928

LER 79-011/03X-1 on 790828:process & Ventilation Particulates & Gaseous Monitors Were W/O Power on Two Occasions.Caused by Loose Lug Connection on Power Supply Cable.Loose Connection Repaired & Plants Restored to Svc

ML19276G928
Person / Time
Site:	Surry
Issue date:	08/21/1979
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18130A515	List: ML18130A514 ML19276G928
References
LER-79-011-03X, LER-79-11-3X, NUDOCS 7908280667
Download: ML19276G928 (2)

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/ L 63 E1 DOCKET NUYdE R Evt Nr atsCHiPriON AND DHO3ABLE CON 3EQUCNCf s ED [ On two occasions with both units at col d s t_u t down , the Process Vent Particulate and I o 3 l Gaseous nonitors and the Ventilation Vent Particulate and Caseous _ mnitors were with- l o 64 lout power because of a loose luo connection on a nower supolv eM ' > This is enntraegj loIsl ito Technical Specifications 3.11.B.4 and is reportable as ner Technical Soecification I L O ) ] 16.6.2.B. (2) . The heal t.h and safety of t % ou',l i c wcIn not a f fec ted 1 O i l I O 9 l 7 8 9 W

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[il,] lthe first event attributed the failure to a blown fuse. After the second event, the l i 4 loose connection was discovered, repai red, and the rnoni tors were restored to service. I i E 9 80 5 1  % PO/.E R OTHEH STA TUS b SC V H D'iCOk E RY DESCRIPTION i ,

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tachment, page 1 of 1) UPDATE LER Surry Power Station, Units 1 6 2 Docke t Mos: 50-280; 50-281 Report No: 79-Oll/03X-1

1. Desc ript ion of Event on two occasions, 3/28/79 and 4/25/79, with both units at cold shutdown, it was observed by Operations personnel that the following radiation monitors were without power; Process Vent-Particulate monitor (101-GN-101), Process Vent-Gas monitor (RM-GU-102) , Ventilation Vent-Particula te monitor (RM-VG-103) and Ven tila-tion Vent Cas Ifonitor (RM-VG-104) . This is contrary to Technical Specifications 3.ll.b.4 and is reportable as per Technical Specifications 6.6.2.b. (2) .

2. Probable Consequences and Status of Redundant Systems During the periods these nonitors were out of service, there vere no significant gaseous releases noted by Health Physics' accountability sampling of the Process Vent and Ventilation Vent systems. The health and safety of the general public were not af fected.

3. Cause:

On 3-28-79, the loss of power was attributed to a blown fuse. After the second event, subsequent investigation determined both events were caused by a loose lug connection located on the power supply lead, which supplies the power to these radiation conitors. This is considered a random event.

4. Inmediate Corrective Action:

Both units were ac cold shutdown and the portions of the abnormal procedure pertincat to the plant conditions were perforned. The loose connection was repaired and the affected monitors uere restored to service. The conitors were without pouer during these events for 90 and 12 ainutes respectively.

5. S ub seque nt Corrective Action:

No further corrective action will be required.

6. Actions Taken to Prevent Recurrence:

No acticn will be required since the failure was a randon occurrence.

7. Generic Inplications:

None e

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