ML20009E031
| ML20009E031 | |
| Person / Time | |
|---|---|
| Site: | 05000000 |
| Issue date: | 08/05/1981 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| IEIN-81-24, NUDOCS 8107270003 | |
| Download: ML20009E031 (1) | |
Text
?
K '.
s y.
4 SSINS No.: 6835 Accession No.:
'm fr/o 7AT ed03 IN 81-24 g
UNITED STATiS NUCLEAR REGULATORY I,0MMISSION OFFICE OF INSPFCTION Air rNFORCEMENT WASHINGTON, D a.
i5 August 5, 196.
IE INF0lHATION NOTICE NO. 81-24: AUXILIARY FEED PUMP TURBINE BEARINi FAILURES Description of Circumstances:
During an inspect'Jn of one auxiliary feed pump inboard turbine journal bearing to determine the cause of dirty oil, Baltimore Gas and Electric Company Qund the bearing damaged.
The other auxiliary feed pump turbines were disassembled and similar damage was found on all inboard journal bearings.
The Lurbines are Terry Turbine type GS-2.
Bearing lubrication is accomplished by oil ring pick-up from reservoirs at either end of the turbine.
Each reservoir is fitted with a sight glass about three inches long to monitor oil level.
The damage has been attributed to a failure to maintain oil level within a narrow operating range (approximately 1/4 inch) within the sight glass.
A similar instance of bearing failure was discovered by Northeast Utilities during an inservice inspection of the turbine bearings at Millstone Unit 2.
Both facilities reporting the bearing failures have the Terry Turbine type GS-2 where bearing lubrication is supplied by oil ring pick-up only.
The corrective actions taken have been to clearly mark the maximum and minimum allowed oil levels on the sight glass.
A spot check of other facilities using Terry Turbines in PWR and BWR appli-cations has revealed that the Terry Turbine types GS-2 and GS-1 can have a combination of force feed and oil ring pick-up lubrication.
In these applications, the oil ring pick-up supplies lubrication during startup and coastdown of the turbine. A check of the Technical Manual has shown that proper oil level range for the oil ring pick-up was not addressed.
- However, the level should be maintained within a narrow range to provide adequate lubrication during startup & coastdown.
1 No written response to this information is required.
If you need additional information regarding this matter, please contact the Director of the appro-priate NRC Regional Office.
Attachment:
Recently issued IE Information Notices B$113$$$3
- l. >'
l 92 1
Attachment IN 81-24 August 5, 1981
'N RECENTLY ISSUED IE INFORMATION NOTICES Information Date of Notice No.
Subject Issue issued to 81-23 Fuel Assembly Damaged 8/4/81 All power reactor due to Improper Positioning facilities with an of Handling Equipment OL or CP 81-22 Section 235 and 236 7/31/81 All power research Amendments to the reactor, fuel Atomic Energy Act fabrication and of 1954 reprocessing, and spent fuel storage licensees and applicants 81-21 Potential Loss of Direct 7/21/81 All power reactor Access to Ultimate Heat Sink facilities with an OL or CP 81-20 Test Failures of Electrical 7/13/81 All power reactor Penetration Assemblies facilities with an OL or CP 81-19 Lost Parts in Primarj 7/6/81 All power reactor Coolant System facilities with an OL or CP 81-18 Excessive Radiation 6/23/81 Specified licensees Exposures to the Fingers of holding byproduct Three Individuals Incurred licenses During Cleaning and Wipe Testing of Radioactive Sealed Sources at a Sealed-Source Manufacturing Facili ty 81-16 Control Rod Drive System 4/23/81 All BWR facilities Malfunctions with an OL or CP 81-15 Degradation of Automatic 4/22/81 All power reactor ECCS Actuation Capability facilities with an by Isolation of Instrument OL or CP Lines OL = Operating Licenses CP = Construction Permits