ML19209A278
| ML19209A278 | |
| Person / Time | |
|---|---|
| Site: | Bailly |
| Issue date: | 09/13/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Shorb E NORTHERN INDIANA PUBLIC SERVICE CO. |
| References | |
| NUDOCS 7910030266 | |
| Download: ML19209A278 (1) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION n
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GLEN ELLYN. ILLINOIS 6o137 Docket No. 50-367 SEP 131979 Northern Indiana Public Service Company ATTN:
Mr. Eugene M. Shorb Senior Vice President 5265 Hohman Avenue Hammond, IN 46325 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, fpfe Director
Enclosures:
1.
IE Circular No. 79-19 2.
List of IE Circulars Issued in the Last 6 Months cc w/ encl:
Central Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Mr. Dean Hansell, Office of Assistant Attorney General 1087 274 7s20 oso g gg P
6 SSINS:
6830 Accession No: 7908220111 UNITED STATES NUCLEAR REGULATORY C04tISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 September 13, 1979 IE Circular No. 79-19 LOOSE LOCKING DEVICES ON INGERSOLL-RAND PUMP IMPELLERS Description of Circumstances:
Three reports have been submitted to the NRC regarding the loosening of locking devi es 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 Nuclear One (ANO).
It was discovered that the washers, jarn 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 washer.
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 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 recctor 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 torque requirements.
The third report was 10 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 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 Westing-house plant owners on loose lock nuts on Ingersoll-Rand Types W. WD, and WDF pumps.
Excerpts from that Technical Bulletin are in Enclosure No. 1.
Combustion Engineering, Inc. has, also, informed the NRC of their actions relative to t same problem in a letter dated March 13 DUPLICATE DOCUMENT Entire document previously entered into system under:
ANO c
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