05000348/LER-1978-088-03, /03L-1 on 791125:train a River Water Pumps Found Tripped & Could Not Be Restarted from Control Room.Caused by Moisture in Switch Box.Condulet Sealing Fittings Installed on Switch Box to Prevent Water Accumulation.Design Chan

/03L-1 on 791125:train a River Water Pumps Found Tripped & Could Not Be Restarted from Control Room.Caused by Moisture in Switch Box.Condulet Sealing Fittings Installed on Switch Box to Prevent Water Accumulation.Design Changed

ML19224D810
Person / Time
Site:	Farley
Issue date:	07/09/1979
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19224D791	List: 05000348/LER-1979-025-03, /03L-0 on 790623:during Surveillance Test FNP-1-STP-256.11 Both Source Range Channels Inadvertently Were Deenergized. Caused by Procedure Deficiency. Power Restored & Procedure Changed ML19224D790
References
LER-78-088-03L, LER-78-88-3L, NUDOCS 7907170071
Download: ML19224D810 (3)

LER-1978-088, /03L-1 on 791125:train a River Water Pumps Found Tripped & Could Not Be Restarted from Control Room.Caused by Moisture in Switch Box.Condulet Sealing Fittings Installed on Switch Box to Prevent Water Accumulation.Design Changed

Event date:
Report date:
3481978088R03 - NRC Website

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gigl I condition and could not be started from the Control. Room.

The oymos were operat o la l local control.

T/S 3.7.5 requires both RW loops operable. The Train A RW pumos wet a,.,, l returned to an operabia status at 0726 on 11/25/78. T/S 3.7.5 action statement 2 is j gequirements were met.

The Traia B RW nunOs were coerable. This occurrence had no f

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ALABAMA POWER COMPANY JOSEPH M. FARLEY NUCLEAR PLA.'iT DOCKET No. 50-348 ATTACHMENT TO LER 78-088/03L-1 Facility:

Joseph M. Farley Unit 1 Report Date:

7/9/79 Event Date:

11/25/78 Identification of Event:

Train A River Water Pumps could not be started from the Control Room.

Conditions Prior to Event

The ur it was in Mode 1 (100*4 power).

Description of Event

At 0625 on 11/25/78 Train A River Water (RW) Pumps were observed to be in

,a tripped condition and could not be started from the Control Room. The pumps codld be operated in local control. T/S 3.7.5 requires both R.W.

loops operable. The Train A RW pumps were returned to an operable status at 072U on 11/25/78.

T/S 3.7.5 action statement requirements were met.

The Train B RW pumps were operable.

Designation of Apparent Cause:

Immedia:cly prior to this incident one Train A RW pump was in "Run", the other tuo pumps were in "Autc".

Service pond Icvel switch, LS-511 (Upper Linit Svitch), was actuated on a high level.

When the pond level dropped, the upper switch did not clear and the pumps were prevented from starting when the low level switch was actuated.

This also caused the running river water pucp to trip.

An investigation determined that the failure of LS-511 was apparently caused by moisture accumulation in the switch box.

Analysis of Event-Service pond tvel switch, LS-511, starts the Train A RW pumps when in

" Auto" in order to maintain the service Iond level.

The sersice po.d level was within Tech. Spec. limits at the time of the cccurrecce, also the Train 3 River Water pumps were operable. The Train A River Water pumps were restored to an operable status within the time limits npecified in Tech. Spec. 3.7.5.

The health and safety of the general public were not affected by this occurrence.

b

LER 78-083/03L-1

Corrective Action

A.

A test procedure was developed and performed in an attempt to simulate the condicions reported in this LER. The results of this test were inconclusive.

However, further investigation determined that the LS-511 fault was caused by moisture accumulation in the switch box.

Crouse-Hinds condulet sealing fittings have been installed on the LS-511 switchbox to prevent water accumulation.

B.

Delaval-Gems, series L5-800 level switches have been installed to replace the Robershaw Controls Company Leveloc switch Model No.

SL-416-B1 on LS-511.

C.

A design change has been implemented which will allow the pond low level switch to override the high level switch should both actuate simultaneously.

Failure Data:

Previous failures of LS-511 were reported in LER's 77-018/03L-0, 77-019/03L-0,

_. s 77-044/03L-0, 77-058/03L-0, 78-005/03L-0, and 78-053/031-0.

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