ML19289G181
| ML19289G181 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 07/11/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Weigand J GULF STATES UTILITIES CO. |
| References | |
| NUDOCS 7907190493 | |
| Download: ML19289G181 (1) | |
Text
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_,o, UNITED STATES NUCLEAR REGULATORY COMMISSION g 7..
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REGION IV 611 RYAN PLAZA DRIVE. SUITE 1000
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July 11, 1979 In Reply Refer To:
RIV Docket Nos.
50-458/IE Bulletin No. 79-15 50-459/IE Bulletin No. 79-15 Gulf Statea Utilities Attn:
Dr. J G. Weigand General Manager, Nuclear Projects Post Office Box 2951 Beaumont, Texas 77704 Gentlemen:
The enclosed IE 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,
/.M.
,N Karl V. Seyfrit/
Director
Enclosures:
1.
Listing of IE Bulletins Issued in Last 12 Months
~
2058 294 5907' 90W3 p
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 pu ap 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 and 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. 12X20 September 1972)
Bearing clearance exceeded recommen onrn 10C Wear ring clearance out-of-specific DUPLICATE DOCUMENT 4 U J ()
L7J Bearings showed wear Entire document previously entered into system under:
ANO No. of pages: