ML19225A262
| ML19225A262 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 07/11/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Johari Moore SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| NUDOCS 7907180704 | |
| Download: ML19225A262 (1) | |
Text
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WALNUT CHL E K, CAltFORNIA 94%G July 11, 1979 Docket fios. 50-361 50-362 Southern California Edison Ccmpany P. O. Box 800 2244 Walnut Grove Avenue Rosenead, California 91770 Attention: 11r. J. B. P.0>re Vice Presidant Gentlemen:
The enclosed IE Bulletin t;o. 79-15 is forwarded to you for action.
A written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, l ' 5
, e J..
R. H. Engelken Director
Enclosures:
1.
IE Bulletin flo. 79-15 2.
l.ist of IE Bulletins Issued in Last 12 llonths cc w/ enclosures:
J. H. Drake, SCE
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79071807of 34/
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UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION ANP ENFORCEMENT WASlilNGTON, D.C.
20555 July 11,1979 IE Bulletin No. 79-15 DEEP URAFT PUMP DEFICIENCIES Description of Circumstances:
On October 20, 1978, Commonwealth Edison Company reported that manufacturing deficiencies had been identified in new high pressure core spray, low pressure core spray, and residual heat removal pumps manufactured by Ingersoll-Rand (I-R)
Company, Cameron Pump Division.
Each of these pumps is a vertical turbine pump with impellers located in bowls in a sump or a self cantained barrel.
The motor (prime mover) is located at the highest pump elevation to take into account maximum flooding at the site or space considerations.
The suction is at the lower end of the pump while the discharge head is just below the driver.
Bearings supportir.g the vertical shaf t segments (usually 5 to 10 segments) are either self lubricated, force fed (lubricated by fluid being pum.ced), or oil lubricated and maintained within their cwn isolated system.
These pumps are designated as " Deep Draft".
Figures 1&2 si.ow typical outlines of such pumps.
The internal deficiencies, identified through dimensional and visual inspections were as follows:
Low ", essure Core Spray Pumps (I-R Model No. 29APKD-5) (Date of Manufacture -
Feburary 1973)
Loese impeller bolts and bolts improperly staked Loose key - keyway fit Excessive runcut on pump shaft Bearing showed wear Bearing clearance exceeded recommended tolerance Coupling thread galled Wear ring clearance out-of-specification Impeller-to-shaft clearance out of specification Cracks found in second-and-third-stage impellers Stuffing box bushings were severely galled High Pressure Core Spray Pumps (I-P, Model No.12X20KD) (Date of Manufacture -
September 1972)
Bearing clearance exceeded re 7M-4~M1or3nm_ _ '
~~"m-Wear ring clearance out-of-sp Bearings showed wear DUPLICATE DOCtJMENT Entire document previously entered
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