ML19254A706
| ML19254A706 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 07/11/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | White L ROCHESTER GAS & ELECTRIC CORP. |
| References | |
| NUDOCS 7907270367 | |
| Download: ML19254A706 (1) | |
Text
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UNITED STATES D<
y y ) s > (, (,g NUCLEAR REGULATORY COMMISSION E.' O REGION I 9,.I3 h[/ rf 631 PARK AVENUE
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,d" KING OF PRUSSIA PENNSYLVANIA 19406 July 11, 1979 Docket No. 50-244 Rochester Gas and Electric Corporation ATTN:
Mr. Leon D. White, Jr.
Vice President Electric and Steam Production 89 East Avenue Rochester, New York 14649 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, Q
~
s Boyce H. Grier M irector
Enclosures:
1.
IE Bulletin No. 79-15 w/ Attachments 2.
Listing of IE Bulletins Issued in Last Twelve Months cc w/encls:
B. A. Snow, Plant Superintendent S. Bullock, QC Engineer Lex K. Larson, Esquire
',7 7 907270 J D (
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ENCLO_SURE 1 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Bulletin No. 79-15 Date:
July 11, 1979 Page 1 of 3 DEEP DRAFT 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 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 the driver.
Bearings supporting the vertical shaf t 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 system.
These pumps are designated as " Deep Draft".
Figures 1&2 show typical outlines of such pumps.
The internal deficiencies, identified through dimensional and visual inspec ions were as follows:
Low Pressure 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 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 vere severely galled High Pressure Core Spray Pumps (I-R Mod September 1972)
Bearing clearance exceeded recommend Wear ring clearance out-of-specifica Entire document previously Bearings showed wear entered into system under:
wo 75t$7/95/M No. of pages: