ML19225C365
| ML19225C365 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 07/11/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| NUDOCS 7907270358 | |
| Download: ML19225C365 (1) | |
Text
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UNITED STATES 7:f<'
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REGION I 3
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631 PARK AVENUE
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KING OF PRUSSIA, PENNSYLVANI A 19406 July 11, 1979 Docket Nos. 50-277 50-278 Philadelphia Electric Company ATTN:
Mr. S. L. Daltroff Vice President Electric Production 2301 Market Street Philadeiphia, Pennsylvania 19101 Gentlemen:
The enclosed 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,
/
Mf J yce H. Grier Director
Enclosures:
1.
IE Bulletin No. 79-15 w/ Attachments 2.
Listing of IE Bulletins Issued in Last Twelve Months cc w/encls:
W. T. Ullrich, Station Superintendent Trov o Conner, Jr., Esquire Eugene J. Bradley, Esquire Raymond L. Hovis, Esquire Warren Rich, Esquire A27 03f/
,757 7 907 276 ~ %
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ENCLOSURE 1 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-15 Date:
July 21, 1979 Page 1 of 3 DEEP DRAFT PUMP DEFICIENCIES Description of Circumstances:
On Octobe.- 20, 1978, Commonwee.lth Edison Company rep';rted 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 locat in bowls in a sump or a self contained 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 tho driver.
Bearings supporting the vertical shaft segments (usually 5 to 10 segments) are either self lubricated, force fed (lubricated by fluid being pumped), or oil lubricated and maintained within their own isolated rystem.
These pumos are uesignated as " Deep Draft".
Figures 112 show typical outlines of such pumps.
The internal deficiencies, identified through dimensional and visual icspections were as follows:
Low. essure Core Spray Pumps (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 pump shaft Boaring 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 severe)," H lad High Pressure Core Spray Pumps (I-R DUPLICATE DOCUMENT September 1972)
, Entire document Vi Bearing clearance eu.eeded recomr into system under Sly entered Wear ring clearance out-of-speci
_ ) 9() y 7 g/g g Bearings showed wear ANO 427 g3g n
or payst 7
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