ML19209A126
| ML19209A126 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 09/13/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 7910020588 | |
| Download: ML19209A126 (1) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION Qp].'l o
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,e REGION 11 b[
101 MARIETTA ST N.W., SUITE 3100 0,
o ATLANTA, GEORGIA 30303 In Reply Refer To:
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QO-395].:
South Carolina Electric and Gas Company Attn:
T. C. Nichols, Jr., Vice President Power Production and System Operations P. O. Box 764 Columbia, South Carolina 29218 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, JamesN Director
Enclosures:
1.
IE Circular No. 79-19 2.
List of IE Circulars Issued in the Last Six Months 1136 052 M
7910020 688-
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SSINS:
6830 g
Accession No: 7908220111 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 September 13, 1979 IE Circular No. 79-19 LOOSE LOCKING DEVICEP ON INGERSOLL-RAND PUMP IMPELLERS Description of Circumstances:
Three reports have been submitted to tie NRC regarding the loosening >f locking S
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 Arkansar. Power and Light Company in letters of March 17, 1978 and May 9, 1978. The licensee reporte1 excessive noise and vibrations in both Low Pressure f,afety Injection (LPSI) puers during the preoperational tes?. program on Unit I of Arkansas Nuclear One (ANO).
It was discovered that the washers, jam nut and cap nut used to retain the impellers were missing on both pumps (Ingerso"l-Rand Type 8X20WD). The licensee's corrective action involved th!
installstion of a tab washet.
This corrective action was, alt.o, takca on the contaiument spray pumps (In;ersoll-Rand Type 6X23WD) because of similarity of design.
The second report was wbmitted by Duke Power Company in a licensee event report (LER 50-287/78-2a) dated Jar.uary 24, 1979.
The symptoms were similar to those observed at ANO Unit 2 ir that high vibration was detected i.n a reactot 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 revisioit to the maintenance procedure to specify torque requirements.
The third report was 'O CFR 21 Report No. 79-01 submitted by Portland General Electric Co. on April 16, 1979. This report identified a deficiency 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 identifieo because of the similarity of the containment spray pumps design to the residual heat rooval (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 Westing-house plant owne m on loose lock nuts on Ingersoll-Rand Types W, WD, and WDF pumps. Excerpts from that Technico Engineering, Inc. has, also, xnforn eggvg= gg.77 g gg f
same problem in a letter dated Marc ' DUPLICATE DOCUMENT rnclosure No. 2.
Entire document previously entered into system u der:
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