05000321/LER-1980-072-03, /03L-0:on 800624,reactor Bldg Vent Radiation Monitor Sample Pump Failed in Run Mode at 2426 Mwt.Caused by Swelled Carbon Vanes.Pumps Will Be Switched Out More Often to Minimize Moisture Buildup & Improve Reliability

/03L-0:on 800624,reactor Bldg Vent Radiation Monitor Sample Pump Failed in Run Mode at 2426 Mwt.Caused by Swelled Carbon Vanes.Pumps Will Be Switched Out More Often to Minimize Moisture Buildup & Improve Reliability

ML19329G008
Person / Time
Site:	Hatch
Issue date:	07/02/1980
From:	Rogers W GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19329G003	List: 05000321/LER-1980-072, Forwards LER 80-072/03L-0 05000321/LER-1980-072-03, /03L-0:on 800624,reactor Bldg Vent Radiation Monitor Sample Pump Failed in Run Mode at 2426 Mwt.Caused by Swelled Carbon Vanes.Pumps Will Be Switched Out More Often to Minimize Moisture Buildup & Improve Reliability
References
LER-80-072-03L-01, LER-80-72-3L-1, NUDOCS 8007110463
Download: ML19329G008 (2)

LER-1980-072, /03L-0:on 800624,reactor Bldg Vent Radiation Monitor Sample Pump Failed in Run Mode at 2426 Mwt.Caused by Swelled Carbon Vanes.Pumps Will Be Switched Out More Often to Minimize Moisture Buildup & Improve Reliability

Event date:
Report date:
3211980072R03 - NRC Website

text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION (7 77)

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8 60 61 DOCKET NUMBER 68 69 LVENT OAT E 14 75 REPORT DATE 30 EVENT DESCRIPTION AND PRO 9ABLE CONSEQUENCES h IO l2l l _ While tile reactor was opprat i ag at 2426 MWT the reactor buildina vent I

[ la j l radiation monitor sample pump failed. Attempts to start the backup sam-1 Io l41 l ple pump also failed. Werk was initiated to get a pump operable. The 1

lOisl l Lab was notified to take daily samples as per Tech Specs. There were nol lO is i l effects upon public health and safety due to this event.

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33 34 35 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTI.ONS h g l The cause of this event has been attributed to moisture swelling the I

lililI carbon vanes in the pump thus locking the pump so it was unable to moveJ ml These pumps will be switched out on a frequency which proves to be ade-l i 3 l quate to prevent future occurrence of this problem.

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NARRATIVE

REPORT Reportable Occurrence Report No. 50-321/1980-72 With the reactor in the run mode at 2426 f!WT, the operatcr noticed a Hi-Low Flow Alarm for the Reactor Building Vent Sample System.

Lab and Operations personnel were sent to investigate. The' sample pump had-failed, and the lab personnel attempted to valve in and start the backup pump.

It would not start.

A main-tenance request was initiated notino that Technical Specifications made it a seven-day limiting condition of op ation.

The cause of the backup pump not

,qg has been determined to be swelled carbon vanes.

This was probably,

roisture. We will revise our sampling procedure to switch pumps.

. 'ently to minimize moi'sture buildup and improve the reliability of the bactue pump.

- There were no Technical Specifications violated and tha pump was operating within 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />s-of the time the alarm was noticed by the operator.

This type of pump is used in the Main Stack and Recombiner Building Off Gas Sample System.

The pumps in the Main Stack do have a history of similar failures.

There were no. effects upon safe plant operation or upon public health or safety.

4