ML19225C364
| ML19225C364 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 07/11/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Boyer V PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| NUDOCS 7907270353 | |
| Download: ML19225C364 (1) | |
Text
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o UNITED STATES S 'f) e (g[',,g NUCLEAR REGULATORY COMMISSION
.gr$., y REGION I 0,,'f+' j g Ug 631 PARK AVENUE U,
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o KING OF PRUSSIA, PENNSYLVANIA 19406 July 11, 1979 Docket Nos. 50-352 50-353 Philadelphia Electric Company ATTN:
Mr. V. S. Boyer Vice President Engineering and Research 2301 Market Street Philadelphia, Pennsylvania 19101 Gentlemen:
The enclosed Bulletin No. 79-15 is forwarded to you for action.
A wrict.en response is required.
If you desire additional information regardin0 this matter, please contact this office.
Sincerely, (O
oyce H.
rier M irector
Enclosures:
1.
IE Bulletin No. 79-15 w/ Attachments 2.
Listing of IE Bulletins Issued in Last Twelve Months
$}'7
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027 79072707f3'"
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 ?
DEEP DRAFT PUMP DEFICIE.NCIES Description of Circumstances:
On October 20, 1978, Commonwealth Edison Company reported that manufacturing deficiencies had been identified in new high pressure core spray, lu 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 taka into account maximum floodino 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 oy 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 runaut 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
_x High Pressure Core Spray Pumps (I-R Mod iDUPLICATE DOCUMENT September 1972)
! Entire document previously entered Bearing clearance exceeded recommend i into system under:
Wear ring clearance out-of-specifica Bearings showed wear ANO 7Y b 7/ f P
4 No. of pages:
427 029 i
+-s a
.