ML19247A385
| ML19247A385 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 07/11/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Hines E DETROIT EDISON CO. |
| References | |
| NUDOCS 7907310334 | |
| Download: ML19247A385 (1) | |
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UNITED STATES PDR
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GLEN ELLYN, ILLINOls 60137
%.'.br JVI. I 11979 Docket No. 50-341 The Detroit Edison Company AITN:
Mr. Edward Hines, Assistant Vice President and Manager Quality Assurance 2000 Second Avenue Detroit, MI 48226 Gentlemen:
The enclosed IE Bulletin No. 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, dB
- James G. Keppler Director
Enclosures:
1.
Listing of IE Bulletins Issued in Last 12 Months cc w/ encl:
Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Ronald Callen, Michigan Public Service Commission Eugene B. Thomas, Jr.,
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7907310334
U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION III July 11, 1979 IE Bulletin No. 79-15 DEEP DRAFT PUMP DEFICIENCIES
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Description of Circumstances:
On October 20, 1978, Co==onwealth Edison Company reported that manufacturing deficiencies had been identified in new high pressure core spray, low pressure core spray, and residual heat removal pu=ps manufactured by Ingersoll-Rand (I-R)
Company, Cameron Pu=p Division.
Each of these pu ps is a vertical turbine pu=p with i=pellers located in bowls in a su=p or a self contained barrel.
The motor (pri=e mover) is located at the highest pu=p elevation to take into account maximum flooding at the site
.or space consideratier:s. The suction is at the lower end of the pu=p while the discharge head is just below the driver. Bearings supporting the vertical shaft seg=ents (usually 5 to 10 seg=ents) are either self lubricated, force fed (lubricated by fluid being pu= ped), or oil lubricated and maintained within their own isolated system. These pumps are designated as " Deep Draf t".
Figures 1&2 show typical outlines of such pumps.
The internal deficiencies, identified through dimensional and visual inspections were as follows:
Lov Pressure Core Spray Pu=ps (I-R Model No. 29APKD-5) (Date of Manufacture -
Feburary 1973)
Loose impeller bolts and bolts improperly staked Loose key - keyway fit Excessive runout on pu=p shaf t Bearing showed wear Bearing clearance exceeded recommended tolerance Ccupling thread galled Wear ring clearance out-of-specification Impeller-to-shaft clearance out of specification s
. gp Cracks found in second-and-third-stage i=pellers U i UMO Stuffing box bushings vers severely galled High Pressure Core Spray Pu=ps (I-R Model No. 12X200) (Date of Manufacture -
September 1972)
Bearing clearance exceeded reco= mended tole:~,
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i Wear ring clearance out-of-specification DUPLICATE DOCUMENT Bearings showed wear
_g j1 Entire document previously entered iinto system under:
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No. of Pages:
9