ML19282B211

LER 78-025/01T-0 on 780519:during HPCI Sys Surveillance Testing,Hpci Pump Did Not Reach Required Discharge Flow Rate.Sys Declared Inoperable.Cause Unknown.Potential Cause Thought to Be Water in Turbine

ML19282B211
Person / Time
Site:	Duane Arnold
Issue date:	02/06/1978
From:	IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19282B203	List: ML19282B202 ML19282B211
References
FOIA-79-35 LER-78-025-01T, LER-78-25-1T, NUDOCS 7903090375
Download: ML19282B211 (2)

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l During IIPCI systen surveillance testino. HPCT puro did not reach rem 1 ire I

l d discharge flow rate of 3000 ar:m due to failure of tt'rbine to reach ful

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l 1 rated speed. IIPCI system declared inocerable. Redundant ECCS verified

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I operable. Recetitive occurrence. See RO 77-77, 17-95 and 77-96.

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M J7 40 el s2 4F CAUSE DESCRIPTION AND COARECTIVE ACTIONS h I Under investication bv licensee's Encineer Bl Cause of occurrence ur.known. i- " " """ l

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. ,, LICENSEE EVENT REPORT-Supplen . .al Data Docket Number 050-02a1 -

isee Event Report Dates 6-2-78 table Occurrence No: 78-025 t Description ng surveillance testing of the HPCI System, the HPCI pump did not reach the ired disenarg' flow rate (3000 gpm) due to failure of the turbine to reach full d speed. The HPCI system was declared inoperable and redundant emergency cooling systems were demonstrated to be operabic. This occurrence is titive (see RO 77-77, 77-95 and 77-96).

e ause of the occurrence remains under investigation. Investigation as to the it of previous occurrences has been inconclusive. Following RO 77-096, the probable cause was thought to be wear in the turbine shaft driven oil pump.

is thought that the capacity of the shaf t drives oil pump at low turbine speeds nsuf ficient to fully open the turbine stop valve and allow the turbine to .

rated speed. However, disassembly and inspection of the shaft driven oil during the recent refueling outage did not reveal any abnormal wear or other lems which would limit the pumps capability to reach full capacity.

ontinuing investigation has identified another possible cause for the repetitive rences. Abnormal amounts of water have been discovered in the HPCI turbine lube system. The water in the oil may be causing abnormal operation of the HPCI ine control system. The source of the water and determination of appropriate active actions are under investigation by the licensee's Engineering Department.

2ctive Action temporary measure, the auxiliary oil pump cutoff pressure switch setpoint has raised slightly to extend pump run time during HPCI system start. Special

.ng performed as a result of the previous occurrences demonstrated that satisfactory s of the HPCI system are obtained with the auxiliary oil pump cutoff pressure h setpoint elevated slightly. Pending completion of investigation into the cause te occurrences and implementation of corrective actions, the frequency for performance

'CI surveillance testing has been increased to bi-weekly.

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