ML19246B835
| ML19246B835 | |
| Person / Time | |
|---|---|
| Site: | Columbia, Washington Public Power Supply System, Satsop  |
| Issue date: | 07/11/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Strand N WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| References | |
| NUDOCS 7907180711 | |
| Download: ML19246B835 (1) | |
Text
'o, UNITED STATES b
p NUCLEAR REG TORY COMMISSION t h./
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1990 fJ. C ALIF ORNI A HOULEVARD 5'
- 6 SUITE 202, WALNUT CRi. L K PL AZA
';9 WALNU T CH E E K, CALIFOHNI A 9150G July 11, 1979 Docket flos. 50-460 50-397 50-503 50-509 50-513 Washington Pui) ic Po',ler Supply System P. O. Box 968 3000 George Hashington Way Richland, Washington 99352 Attention: Mr. :i. 3. 5: rand Managin] :irector Gentie.nen:
The enclosed IE Lil:ti
'::. 7915 is forwarded to you for ac' ion.
A written response is rez_ ire:i.
If you desire additional information regarding this matter, please con:ac; this office.
Sincerely, L'l0..3,Cc R. H. Engelken Director
Enclosures:
1.
List of IE Bulletins Issued in Last 12 Months cc w/ enclosures:
M. E. Witherspoon, WPPSS A. D. Kohler, W:lP-2, WPPSS J. P. Thomas, WPPSS L'. J. Talbot, WFPSS
- 0. C. Sorensen, WPPSS s
'f Y
790718071.o 361 036
UilITED STATES fiUCLEAR REGULATORY C0iOIISSION OFFICE OF IriSPECTI0tl AilD Ef4FORCEMEilT WASHIriSTON, D.C.
20555 July 11,1979 IE Bulletin flo. 79-15 DEEP DRAFT PUMP DEFICIEi4CIES 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 contained barrel.
The motor (prime nover) 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 supporting the vertical shaf t segments (usually 5 to 10 segments) are either self lub-icated, force fed (lubricated by fluid being pumped), or oil lubricated and maintained within their cwn isolated system.
These
.mps are designated as " Deep Draft".
Figures 1&2 show typical outlines of such pumps.
The internal deficiencies, identified through dimensional and visual inspections were as follows:
Low Pressure Core Spray Pumps (I-P Model fio. 29APKD-5) (Date of Manufacture -
Feburary 1973)
Loose impeller bolts and bolts improperly staked Loose key - keyway fit Excessive runout 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-chird-stage impellers Stuffing box bushings were severely galled High Pressure Core Spray Pumps (I-R Model tio.12X20KD) (Date of Manufacture -
September 1972) p ~. m, _ _ _
= ~.,,.
Bearing clearance exceeded recort DUPLICATE DOCUMENT d~
Wear ring clearance out-of-spec
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Bearings showed wear Entire document linto system under sly entered (I -
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