05000338/LER-1979-002-03, /03L-0 on 790101:during Normal Operation,Pump 1-RM-P-159A Tripped on Overload.Containment Particulate Sample Flow Was Lost,Rendering Inoperable 1 Reactor Coolant Leak Detection Sys,Due to Deficient Federal 1206LLT Bearing

/03L-0 on 790101:during Normal Operation,Pump 1-RM-P-159A Tripped on Overload.Containment Particulate Sample Flow Was Lost,Rendering Inoperable 1 Reactor Coolant Leak Detection Sys,Due to Deficient Federal 1206LLT Bearing

ML19263C043
Person / Time
Site:	North Anna
Issue date:	01/29/1979
From:	Cartwright W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19263C039	List: 05000338/LER-1979-002, Forwards LER 79-002/03L-0 & 79-003/03L-0 05000338/LER-1979-002-03, /03L-0 on 790101:during Normal Operation,Pump 1-RM-P-159A Tripped on Overload.Containment Particulate Sample Flow Was Lost,Rendering Inoperable 1 Reactor Coolant Leak Detection Sys,Due to Deficient Federal 1206LLT Bearing 05000338/LER-1979-003-03, /03L-0 on 790102:during Periodic Test,Noted That Containment Isolation Valve TV-SV-102-1 Would Not Shut Fully.Cause Undetermined
References
LER-79-002-03L, LER-79-2-3L, NUDOCS 7902020184
Download: ML19263C043 (2)

LER-1979-002, /03L-0 on 790101:during Normal Operation,Pump 1-RM-P-159A Tripped on Overload.Containment Particulate Sample Flow Was Lost,Rendering Inoperable 1 Reactor Coolant Leak Detection Sys,Due to Deficient Federal 1206LLT Bearing

Event date:
Report date:
3381979002R03 - NRC Website

text

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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t,0 61 DOCKET NUMSER 68 63 EVENT DATE 14 75 REPORT DAT E 80 EVENT oESCRIPTION AND PROBABLE CONSEQUENCES h iDuring normal operation 1-RM-P-159A trioned on overic3d and containment 6 articulate I

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iO l3i isample flow was lost rendering inoperable one reactor coolant leakaae detection I

[O l4 l Isystem (T.S. 3.4.6.1).

Standby pump 1-RM-P-159B was started and samole flow restored.1

]This event did not jeopardize the health and safety of the general public.

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s 10161 I pursuant to T.S. 6.9.1.9.b.

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33 34 35 36 34 40 di 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l A design deficiency in the Model 6 couplino driven Conde Dri-Air pumos results in the I i

O ii ii i [ bearings overheating and seizing. The bearings and carbon var,es were reoiaced: and I

i,,7i i the coupling alignment checked and found to be proper.

Bearinas removed had a broken I l retainer and missing balls (Type: Federal 1206 LLT).

Replaced with type NDH Z 99506 I

3 i, i4 i ] bearings approved by vendor.

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NAME OF PREPARER PHONE:

Virginia Electric and Power Company North Anna Power Station, Unit No.1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 79-02/03L-0

Description of Event

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On 1/1/79 during normal plant operation, a low flow alarm was received on channel RM-RMS-159 (Containment Particulate Monitor) and it was discovered that 1-RM-P-159A had tripped on overload.

Standby pump 1-RM-P-159B was immediately placed in service. This malfunction is reportable as per T.S. 6.9.1.9.b.

Probable Consequences of Occurrence:

The Containment Particulate Monitoring System is used as a primary means of detecting a Reactor Coolant System leak.

The system also provides a signal to secure and isolate the Containment Purge Supply and Exhaust Systems on a high-high particulate level.

The Containment Gas Monitoring System (1-RM-RMS-160) was operable to provide an isolation signal and standby pump 1-RM-P-159B was operative to restore 1-RM-RMS-159 to operable status.

In addition, the Contain-ment Purge and Exhaust Valves were shut at this time.

Therefore, pr-]tection was available and the health and safety of the general public were not jeopardized.

Cause of Occurrence:

This event was caused by failure of a FEDERAL 1206LLT bearing in the sample pump.

It is believed that the bearing overheated causing the ball retainer ring to break resulting in pump seizure.

Immediate Corrective Action

The immediate corrective action was to start the standby pump 1-RM-P-1598 which restored 1-RM-RMS-159 to operable status.

Scheduled Corrective Action:

The bearings and carbon vanes were replaced and the coupling alignment verified to be procer.

1-RM-P-159A was restored to operable status.

Action Taken to Pr vent Recurrence:

Replaced bearing with another type approved by Vendor. An engineering study to monitor the performance of this bean ing is currently being undertaken.