ML19225C356
| ML19225C356 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 07/11/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| NUDOCS 7907270342 | |
| Download: ML19225C356 (1) | |
Text
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o UNITED STATES F#
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E h>( h NUCLEAR REGULATORY COMMISSION 3 (r;k g %, j REGION I 0, 'f* O.A
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,d"g KING OF PRUSSIA. PENNSYLVANIA 19406 July 11, 1979 Doc.ket Nos. 50-245 50-336 50-423 Northeast Nuclear-Energy Company ATTN:
Mr. W. G. Counsil Vice President - Nuclear Engineering and Operations P. O. Box 270 Hartford, Connecticut 06101 Gentlemen:
The enclosed Bulletin No. 79-15 is forwarded to you for action.
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written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely,
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cyce H.
rier Director
Enclosures:
1.
IE Bulletin No. 79-15 w/ Attachments 2.
Listing of IE Bulletins Issued in Last Twelve Months cc w/encls:
J. F. Opeka, Station Superintendent D. G. Diedrick, Manager of Quality Assurance J. R. Himmelwright, Licensing Safeguards Engineer K. W. Gray, Construction Quality Assurance Lead H. R. Nims, Director of Nuclear Projects A. Z. Roisman, Natural Resources Defense Council 427 oyg e,
v 7007270 3f2
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 Dra't".
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 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 were severely galled High Pressure Core Spray Pumps (I-R Model No._1,2R OKDl.IDat u M b m"
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September 1972)
\\ DUPLICATE DOCUMENT _
Bearing clearsnce exceeded recommen i Entire document Previously entered Wear ring clearance out-of-specific Bearings showed wear into system under:
330 7/ 0 7 / 9 U/M 427 og L
c, No. of Pages:
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