05000366/LER-1979-129-03, /03L-0:on 791129,while Performing Procedure HNP-2-3303,HPCI Pump Rated Flow,Thermal Overloads of HPCI Auxiliary Oil Pump Breaker Tripped While HPCI Turbine Being Decreased.Caused by Personnel Error.Thermal Overloads Reset

/03L-0:on 791129,while Performing Procedure HNP-2-3303,HPCI Pump Rated Flow,Thermal Overloads of HPCI Auxiliary Oil Pump Breaker Tripped While HPCI Turbine Being Decreased.Caused by Personnel Error.Thermal Overloads Reset

ML19260C383
Person / Time
Site:	Hatch
Issue date:	12/14/1979
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19260C381	List: 05000366/LER-1979-129, Forwards LER 79-129/03L-0 05000366/LER-1979-129-03, /03L-0:on 791129,while Performing Procedure HNP-2-3303,HPCI Pump Rated Flow,Thermal Overloads of HPCI Auxiliary Oil Pump Breaker Tripped While HPCI Turbine Being Decreased.Caused by Personnel Error.Thermal Overloads Reset
References
LER-79-129-03L, LER-79-129-3L, NUDOCS 7912260269
Download: ML19260C383 (3)

LER-1979-129, /03L-0:on 791129,while Performing Procedure HNP-2-3303,HPCI Pump Rated Flow,Thermal Overloads of HPCI Auxiliary Oil Pump Breaker Tripped While HPCI Turbine Being Decreased.Caused by Personnel Error.Thermal Overloads Reset

Event date:
Report date:
3661979129R03 - NRC Website

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/4 75 FILFO81T D Af f tT EVENT DESCRIPTION AND PROB AULE CONSE GUE.NCES h j,o 2l l With the reactor in the run tode, while performing procedure IP P-2-3303, llPCI Pump l

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lT; q g turbine was not tripped at 2100 RPM as required by procedure !!NP-2-3303, but was

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Cause Description and Corrective Actions (cont) overloads reset.

Procedure llSP-2-3303 was then perforiaed correctly and' found l

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Procedure llNP-2-3303 ull1.be reviewed to con fitta that sufficient precautions i

are p,1ven to insure that the llPCL Turbine will not be run below 2l00 RPM; also, the 11PCi ~a xiliary oil pump cont rol circuit will be reviewed to determine if a timer should be added to the pressure switch ci rcuit.

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NARRATIVE

REPORT f

Georgia Power Company Plant E. 1. Ilatch j

Baxley, Georgia 31513 l

Reportable Occurrence Report No. 50-366/1979-129 With the reactor at 100% power, on November 29, 1979, the thermal overloads of the llPC1 Auxiliary 011 Pump tripped while performing procedure llNP-2-3303.

The llPCI turbine was secured and the system declared inoperable per Technical Spe ci fi ca t ion 3. 5.1.

Operablility of Reactor Core Isolation Cooling, Automatic Depressurization, Core Spray and Low Pressure Coolant Injection was then ascertained by veri fying t. hat the survel))ances were complete and satisf actory.

Although there have been other failures of the llPCI system, re f e ren ce Reportable Occurrence Eeport No. 50-366/1979-116, this occurrence was not repetitive because a corrponent did not f all but personnel were in error.

Instead of tripping the turbine at 2l00 RPM, af ter running it at rated flow as required by procedure and allowing it to.const down, i t was b rough t.down gradually by manual control to approximately 1000 RP:1. This allowed the auxiliary oil pump, which is controlled by a pressure swi tch in the oil system, t o be aided by the shaf t driven oil pu ip and cycle on and off which caused the breaker thernal overloads to t rip.

The auxt]Iary oil pump and motor were checked for damage and the thermal overloads reset.

P roce dure llNP-2-3303 uns then performed correctly and found satisf actorily on Novembe r 30, 1979.

P rocedu re llNP-2-3303 uill be reviewed to confi rm that suf ficient precautions are given to lusure that the llPCI Turbine will not be run below 2100 RPM; also, the llPCI auxiliary oil pump cont rol circuit will be reviewed to determine if l

anything can be added that w1]l help prevent a re-occurrence of this incidtut.

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