ML19247B877
| ML19247B877 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/11/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Herbein J METROPOLITAN EDISON CO. |
| References | |
| NUDOCS 7908150749 | |
| Download: ML19247B877 (1) | |
Text
L# **j&q'o, UNITED STATES C,fAWA /:t uS' g_
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y ),m, j NUCLEAR REGULATORY COMMISSION 3 g';; ^/, [c o,. M REGION I 631 PARK AVENUE U, 'V D
KING OF PRUSSIA, PENNSYLVANIA 19406 S
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July 11, 1979 Docket Nos. 50-289 50-320 Metropolitan Edison Company ATTN:
Mr. J. G. Herbein Vice President P. O. Box 542 Reading, Pennsylvania 19640 Gentlemen:
The enclosed Bulletin No. 79-15 is forwarded to you for information.
No written response is required at this time.
If you desire additional informa-tion regarding this matter, please contact this office.
Sincerely, V
3" W
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[.
y-- Boyce H. Grier 31 rector i
Enclosures:
1.
IE Bulletin No. 79-15 w/ Attachments 2.
Listing of IE Bulletins Issued in Last Twelve Months cc w/encis:
E. G. Wallace, Licensing Manager J. J. Barton, Project Manager L. L. Lawyer, Manager - Generation Operations G. P. Miller, Manager - Cenerating Station - Nuclear J. L. Seelinger, Unit i Superintendent W. E. Potts, Unit 1 Superintendent - Technical Support J. B. Logan, Unit 2 Superintendent G. A. Kunder, Unit 2 Superintendent - Technical Suoport I. R. Finfrock, Jr.
Mr. R. Conrad G. F. Trowbridge, Esquire Miss Mary V. Southard, Chairman, Citizens for a Safe Environment s ?,q'1CB 79 0 815 9 J4 g Q'
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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 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 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 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 inspections 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 Searing 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-R j ^'
' ~ ~ ~ ~ - ~ ~ ^ ~ ~ ~ " ~^ ^
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l' September 1972)
DUPLICATE DOCUMENT g
Nb Bearing clearance exceeded recom:
Entire document previously entered Wear ring clearance out-of-specit. into system under:
y Bearings showed wear No. of pages:
62cil9 n
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