ML19209A266
| ML19209A266 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 09/13/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 7910030250 | |
| Download: ML19209A266 (1) | |
Text
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+4 9'o UNITED STATES NUCLEAR REGULATORY COMMISSION n
- E REGION 111
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799 ROOSEVELT ROAD o,
GLEN ELLYN. ILLINOIS 60137 Docket No. 50-329 Docket No. 50-330 Consumers Power Company ATTN:
Mr. Stephen H. Howell Vice President 1945 West Parnall Road Jackson, MI 49201 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, O. _ u h 6ames'G.Kep er 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 Ronald Callen, Michigan Public Service Commission Dr. Wayne E. North Myron M. Cherry, Chicago 1087 235 7910080
e SSINS:
6850 Accession No: 7908220111 i
UNITED STATES NUCLEAR REGULATORY COMMISSION 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 S scription of Circumstances:
it.ree 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 Safety Injection (LPSI) pumps during the preoperational test program on Unit 2 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 (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 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 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
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+ha Engineering, Inc. has, also, informed tt same problem in a letter dated March 13, Enclosure No. 2.
DUPLICATE DOCUMENT Entire document previously entered into system under:
ANO 1087 236
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