ML19209A438
| ML19209A438 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 09/13/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Goodwin C PORTLAND GENERAL ELECTRIC CO. |
| References | |
| NUDOCS 7910040020 | |
| Download: ML19209A438 (1) | |
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jf UNITED STATES
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WALNUT CREEK, CAllFORNI A 94596 September 13, 1979 Docket No. 50-344 Portland General Electric Company 121 S. W. Salmon Street Portland, Oregon 97204 Attention: Mr. Charles Goodwin, Jr.
Assistant Vice President 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, hm.C&k e
R. H. Engelken Director
Enclosures:
l.
IE Circular No. 79-19 2.
List of IE Circulars Issued in the Last Six Months cc w/ enclosures:
C. P. Yundt, PGE F. C. Gaidos, PGE 1104 015 7910040 O M
SSINS:
6830 Accession No: 7908220131 UNITED STATES NUCLEAR F T.._ATORY CONMISSION OFFICE OF IfiS ECTIOil AllD ENFORCEMEtiT WASHINGTON, D. C.
20555 September 13, 1979 IE Circular No. 79-19 LOOSE LOCKING DEVICES Oil IriGERSOLL-RAND PL'MP IMPELLERS Description of Circumstances:
Three reports have been submitted to the NRC regarding the loosening 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 Sa. :.ty Injection (LPSI) pumps during the preoperational test program on Unit 2 of Arkansas Nuclear One (A"0).
It was discovered that the washers, jam nut and cap nut used to retain the impellers were missi..g on both pumps (Ingersoll-Rand Type 8X20WD). The licensee's corrective action involved the installation of a tab washer. This corrective action was, also, taken on the containment spray pumps (Ingersoll-Rand Type 6X23WD) because of similarity nf design.
The second report was submitted by Duke Power Company in a licensee event report (LER 50-287/78-23) dated January 24, 1979.
The symptoms were similar to those observed at ANO Unit 2 in that high vibration was detected in a reactor building spray pump (Ingersoll-Rand Type 4X11A) for Oconee Unit No. 3.
The licensee found that the impeller had worked loose.
The corrective action included a revision to the mainteinance procedure to specify torgte requirements.
~
The third report was 10 CFR 21 Report No. 79-01 submitted by Por+1and General Electric Co. on April 16, 1979. This report identified a deff uency that may exist in the Trojan Nuclear Plant containment spray pumps (Ingersoll-Rand Type 6X23WD) in that there is a potential for the impeller lock nut to loosen.
The potential deficiency was identified because 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.
Westinghouse Nuclear Service Division has issued a Technical Bulletin to Wes house plant owners on loose lock nuts on Inc ersor nw v -
pumps.
Excerpts from that Technical MalkW Engineering, Inc. has, also, informed DUPLICATEDOCUMENT,a 104 016 same problem in a letter date1 March Entire document previous 1y entered En.:losure No. 2.
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