ML19225A258
| ML19225A258 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 07/11/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7907180700 | |
| Download: ML19225A258 (1) | |
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NUCLEAR REGULATORY COMMISSION g., k, ].,,.g REGION V r; i 2 l y!;. f' f 1930 N. CALIFORNI A HOULEVARD
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Tge[p wntNuT ciire x, CAtirc'RNi A 9:soa July 11, 1979 Docket iios. 50-275 50-323 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94105 Attention:
Mr. Philip A. Crane, Jr.
Assistanc General Counsel Gentl enen:
The enclosed IE Bulletin lio. 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.
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Sincerely, l' ii 5 C,.
R. H. Engelken Director
Enclosures:
1.
IE Bulletin ilo. 79-15 2.
List of IE Bulletins Issued in Last 12 l'onths cc w/ enclosures:
R. Ramsey, PG&E W. A. Raymond, PG&E J. D. Worthington, PGSE CI 7 9 0718 0 7 ec, 347 248
Ui1ITED STATES i;UCLEAR REGULATORY COMMISSI0il 0FFICE OF INSPECTI0!i AiiD ErdORCEMEi!T WASHIiiCT0il, D.C.
20555 July 11,1979 IE Bulletin fio. 79-15 DEEP DRAFT PUMP DEFICIEtiCIES Description of Circumstances:
On October 20, 1978, con 'onwealth 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 Pu p Division.
Each of these pumos is a vertical turbine pump with impellers located in bowls in a sump or a self c n:ained barrel.
The motor (prime movar) is located at the highest puro elevation to take into account maximum flooding at the site or spac? considerati ns.
The suction is at the lower end of the pump while the discharge head is just belcw the driver.
Bearings supporting the vertical shaft segments (usually 5 to 10 segnents) are either self lubricated, force fed (lubricatet by fluid ::eing pumped), or oil lubricated and maintained within their own isolated systr.
These pumps are designated as " Deep Draft".
Figures 1&2 show typical outlines of such pu ps.
The internal deficiencies, identified througi dinensional and visual inspections were as follows:
Low Pressure Core Spray Pumps (I-R isodel i;o. 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 le g A12X20KD) (Date of Manufacture -
September 1972) iDUPLICATE DOCUMENT Wear ring clearance out-of-soecifjEntire documen Bearing clearance exceeded recon;m
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Bearings showed wear into system under:
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