05000254/LER-1980-018-03, /03L-0:on 800805,main Chimney Offgas Sample Pump Tripped.Backup Pump Tripped Also,Producing Low Flow Alarm. Caused by Excessive Vane Wear on Pump Rotors

/03L-0:on 800805,main Chimney Offgas Sample Pump Tripped.Backup Pump Tripped Also,Producing Low Flow Alarm. Caused by Excessive Vane Wear on Pump Rotors

ML19337A091
Person / Time
Site:	Quad Cities
Issue date:	08/15/1980
From:	Hafera T COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19337A089	List: 05000254/LER-1980-018, Forwards LER 80-018/03L-0 05000254/LER-1980-018-03, /03L-0:on 800805,main Chimney Offgas Sample Pump Tripped.Backup Pump Tripped Also,Producing Low Flow Alarm. Caused by Excessive Vane Wear on Pump Rotors
References
LER-80-018-03L-03, LER-80-18-3L-3, NUDOCS 8009080427
Download: ML19337A091 (2)

LER-1980-018, /03L-0:on 800805,main Chimney Offgas Sample Pump Tripped.Backup Pump Tripped Also,Producing Low Flow Alarm. Caused by Excessive Vane Wear on Pump Rotors

Event date:
Report date:
2541980018R03 - NRC Website

text

,NRC FORM 366 U.S. NUCLEAR REGULATORY COMMisSI;N i

(7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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8 60 61 OOCKET NUMs gR 68 69 EVENT DATE 74 75 REPORT 0 ATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10121 l At 2025 on August 5, 1980, with Unit One at 486 MWe and Unit Two at 698 MWe, the l

[o la l l Main Chimney Off Gas Sample pump tripped. The backup pump also tripped when placed g

io ;4 ; ; in service. The steam jet air ejector monitors and the continuous air monitors l

,og3; ; were operable. Tech Spec 3.8.G.2. was satisfied, thus safe reactor operation and g

l0 }6 l l publIC safety were not affected.

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JJ 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h

i !o l l The cause of both pumps tripping was eauipment failure.

Excessive rotor wear 1

i ;i ; [ caused the loose rotor to become wedged against the pump casing. The primary I

,,,3; j pump was replaced with a new one.

The secondary pump was rebuilt and replaced.

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DESCRIPTION

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LER NUMBER: LER/R0 80-18/03L ll.

Ll;ENSEE NAME: Commonwealth Edison Company Quad-Cities Nuclear Pnwer Station Ill.

FACILITY NAME: Unit One IV.

DOCKET NUMBER: 050-254 V.

EVENT DESCRIPTION

At 2025 on August 5, 1980, with both units in steady state operation at 486 and 698 MWe, respectively for Unit One and Unit Two, the Main Chimney Off Gas Sample Pump tripped. When the backup off gas sample pump was started it tripped also. This produced a low flow alarm to the main chimney monitor.

VI.

PROBABLE CONSEQUENCES OF THE OCCURRENCE:

The Steam Jet Air Ejector monitors and the continuous air monitors were operable during this period. Technical Specification 3.8.G.2. was satisfied, thus safe reactor operation and the public safety were not affected.

Vll. CAUSE:

The cause of this malfunction has been designated as equipment failure.

The vanes on the pump rotors had become overly worn and loose to the point where they became wedged between the pump rotor and pump casing, causing the pump to trip. This was found to be the case for both the sample pump and the backup sample pump.

Vill.

CORR'_CTIVE ACTION:

Work Request Q06924 was immediately written to repair the sample pumps.

The primary sample pump was replaced with a new pump and the backup sample pump was rebuilt and replaced. This pump is manufactured by Doerr Electric Corporation, and this is the first occurrence of this type involving this component.

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