ML19209A441
| ML19209A441 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 09/13/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 7910040023 | |
| Download: ML19209A441 (1) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION y ;
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- WALNUT CREEK, C (LIFORNIA 94506 September 13, 1979 Docket No. 50-312 Sacramento Municipal Utility District P. O. Box 15830 Sacramento, California 95813 Attention: Mr. John J. Mattimoe Assistant General Manager Gentlemen:
The enclosed IE Circular No. 79-19 is forwarded to you for information.
No written response is required.
Should you have any questions related to your understanding of this matter, please contact this office.
Sincerely, Bers~,sn R. H. Engelken Director
Enclosures:
1.
IE Circular No. 73-19 2.
List of IE Circulars Issued in the Last Six Months cc w/ enclosures:
R. J. Rodriguez, SMUD L. G. Schwieger, SMUD 7910040023 1090 $
SSIllS:
6830 Accession tio: 7908220111 UtlITED STATES fiUCLEAR REGULATORY COMMISSI0tl 0FFICE OF IllSPECTI0t1 AtlD ErlFORCEMEtlT WASHIrlGT0tl, D. C.
20555 September 13, 1979 IE Circular tio. 79-19 LOOSE LOCKIt4G DEVICES Ott ItiGERSOLL-RAtlD PUMP IMPELLERS Description of Circumstances:
Three reports have been submitted to the fiRC regarding the loosenim of locking devices on the impellers of pumps manufactured by the Ingersoll-Rand Company.
The first report was submitted as a significant deficiency (10 CFR 50.55(e))
by Arkansas Power and Light Company in letters of March 17, 1978 and May 9, 1978. The licensee reported excessive noise and vibrations in both Low Pressure Safety Injection (LPSI) pumps during the preoperational test program on Unit 2 of Arkansas fluclear One (At10).
It was discovered that the washers, jam nut and cap nut used to retain the impellers were missing on both pumps (Ingersoll-Rand Type 8X20WD). The licensee's corrective action involved the installation of a tab wtsher. This corrective action was, also, taken on the containment spray pumps (Ingersoll-Rand Type 6X23WD) because of similarity of design.
The second report was submitted by Duke Power Company in a licensee event 50-287/78-23) dated January 24, 1979.
The symptoms were similar report (LER to those observed at A!10 Unit 2 in that high vibration was detected in a reactor The building spray pump (Ingersc11-Rand Type 4X11A) for Oconee Unit tio. 3.
licensee found that the impeller had worked loose.
The corrective action included a revision to the mainteinance procedure to specify torque requirements.
The third report was 10 CFR 21 Report tio. 79-01 shtmitted by Portland General Electric Co. on April 16, 1979. This report' identified a deficiency that may exist in the Trojan fluclear Plant containment spray pumps (Ingersoll-Rand Type The 6X23WD) in that there is a potential for the impeller lock nut to loosen.
potential deficiency was identified teecause of the similarity of the containment spray pumps design to the residual heat removal (RHR) pumps (Ingersoll-Rand Type 8X20WD) and the discovery of a loose lock nut on an RHR pump during pump maintenance. The corrective action was to provide a positive mechanical lock on the impeller nut.
'destinghouse fluclear Service Division has issued a Technical Bulletin to Westing-hcuse plant owners on loose lock nuts on In ersoll-Rand T es W, WD, and WDF pungs. Excerpts from that Technical Engiceering, Inc. has, also, informe DUPLICATE DOCUMENT same problem in a letter dated March Enclo!.ure flo. 2.
Entire document previously entered into system under:
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