ML19225C353
| ML19225C353 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 07/11/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Groce R Maine Yankee |
| References | |
| NUDOCS 7907270339 | |
| Download: ML19225C353 (1) | |
Text
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UNITED STATES 8 f)
['%j NUCLEAR REGULATORY COMMISSION ti ;'4k
../, gJ REGION I s 'f4 ' a 631 PARK AVENUE O
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,o KING OF PRUSSIA, PENNSYLVANI A 19406 D
July 11, 1979 Docket No. 50-309 Maine Yankee Atomic Power Company ATTN:
Mr. Robert H. Groce Licensing Engineer 20 Turnpike Road Westborough, Massachusetts 01581 Gentlemen:
The enclosed Bulletin No. 79-15 is forwarded to you for action.
A written response is required.
If you desire aditional information regarding this matter, please contact this office.
Sincerely,
_/
C3f,/c h Boyce 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:
E. Wood, Plant Superintendent E. W. Thurlow, President 42'7 0/f
(
7907270 g
ENCLOSURE 1 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 Ifi Bulletin No. 79-15 0 ate:
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)
Compa r, Cameron Pump Division.
Each of these pumps is a vertical turbine pump with.mpellers located in bowls in a sump or a self contained barrel.
The motor (prime mover) is located at the highest cump 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 ata 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 imprope-ly 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 Mod ' J'-am f a
~ ~
September 1972)
DUPLICATE DOCUMElg Bearing clearance exceeded recommend
+
Wear ring clearance out-of specifica Entire document previously entered Bearings showed wear into system under:
7h b7/h U/2 F ANO 427 r
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No. of pages:
M
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