05000331/LER-1978-025-01, /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: |
| References | |
| FOIA-79-35 LER-78-025-01T, LER-78-25-1T, NUDOCS 7903090375 | |
| Download: ML19282B211 (2) | |
| Event date: | |
|---|---|
| Report date: | |
| 3311978025R01 - NRC Website | |
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During IIPCI systen surveillance testino. HPCT puro did not reach rem 1 ire
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I operable. Recetitive occurrence. See RO 77-77, 17-95 and 77-96.
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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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