05000334/LER-1979-003-03, /03L-0 on 790102:increasing Containment Air Partial Pressure observed.1B Containment Vacuum Pump Motor Running,But Pump Not Turning Due to Seized Rotor on Pump

/03L-0 on 790102:increasing Containment Air Partial Pressure observed.1B Containment Vacuum Pump Motor Running,But Pump Not Turning Due to Seized Rotor on Pump

ML19259B433
Person / Time
Site:	Beaver Valley
Issue date:	02/02/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19259B431	List: 05000334/LER-1979-002, Forwards LER 79-002/03L-0 & 79-003/03L-0 05000334/LER-1979-002-03, /03L-0 on 790103:reactor Trip & Safety Injection Occurred.During recovery,1C Charging Pump Had Low Discharge Pressure Due to Faulty Rotating Element in Pump 05000334/LER-1979-003-03, /03L-0 on 790102:increasing Containment Air Partial Pressure observed.1B Containment Vacuum Pump Motor Running,But Pump Not Turning Due to Seized Rotor on Pump
References
LER-79-003-03L, LER-79-3-3L, NUDOCS 7902090331
Download: ML19259B433 (1)

LER-1979-003, /03L-0 on 790102:increasing Containment Air Partial Pressure observed.1B Containment Vacuum Pump Motor Running,But Pump Not Turning Due to Seized Rotor on Pump

Event date:
Report date:
3341979003R03 - NRC Website

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NRC FOR*' 46 U. S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL 8 LOCK: l l

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l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 8 6

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7 8 9 LICENSEE CODE 14 15 LICENSE. Nuv eE R 25 26 LICENSE TYPE JO

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8 60 el OOCK ET NUMB ER t>d 69 EVENT DATE 14 75 REPORT OATE 80 EVENT OESCRIPTION AND PROB ABLE CONSEQUENCES h

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o 2 l At 0225 hours0.0026 days <br />0.0625 hours <br />3.720238e-4 weeks <br />8.56125e-5 months <br />, an increasing containment air partial pressure was cb::crved, even l

@ l though two containment vacuum pumps were in service. An investigation revealed the o 4 IB Containment Vacuum Pump motor was running but the pump was not turning.

The 1

l pur$p was de:.~ared inoperable at 0630 hours0.00729 days <br />0.175 hours <br />0.00104 weeks <br />2.39715e-4 months <br />.

The redundant 1A Vacuum Pumn was l

0 s o s I operable and maintained the containment at the required subatmospheric condition.

1 [o TTI The pump was returned to service on 1/3/79.

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CAUSE

CAUSE COMP.

VALVE CODE CODE SU8 CODE COMPONENT CODE SUSCODE SU8 CODE O 9 lS l A lh [g_jh l B lh lP lU lM lP lX lX lh Wh dj h 7

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10 18 12 13 18 13 20 SEQUENTIAL OCCURRENCE REPORT REVtS10N LER/RO EVENT YEAR REPORT NO.

COD 6 TYPE NO.

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h E IThe incident resulted from a seized rotor on the nu-n.

The numn was ren1nced l

with a new pump and tested successfully.

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7 8 9 80 STA

% POWER OTHER STATUS 015 RY DISCOVERY OESCRIPTION

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8 9 10 t1 44 45 80 PERSONNEL EXPOSURES NUM8FR TYPE D E SCRIPTION 1010l01@lzl@l N/A l

i T PE RsONN E L imu' ins cEsCRiPTiON@

NUM8ER 1010 Ol@l N/A l

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8 9 it 12 30 LOSS OP OR DAMAGE TO FACILITv TYPE D E SCRIP TION U;j@l N/A l

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UN NAME OF PRCPARER PHONE:

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