ML19209A127
| ML19209A127 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 09/13/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Mary Johnson SOUTH CAROLINA ELECTRIC & GAS CO. |
| References | |
| NUDOCS 7910020591 | |
| Download: ML19209A127 (1) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION o
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101 MARIETTA ST., N.W., SUITE 3100
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ATLANTA, GEORGIA 303o3 TF; In Reply Refer To:
SEP 131979 RII:JPO Q0-395 South Carolina Electric and Gas Company Attn:
M. C. Johnson, Vice President Special Services and Purchasing 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, Ja5es$
Director
Enclosures:
1.
IE Circular No. 79-19 2.
List of IE Circulars Issued in the Last Six Months U 36 049 6
7910020 5 9/
SEP 131979 South Carolina Electric and Gas Company cc w/ enc 1:
T. B. Conners, Jr.
Conners, Moore and Corber 1747 Pennsylvania Avenue, N.W.
Washington, D.C.
20006 A. A. Smith Quality Assurance Post Office Box 8 Jenkinsville, South Carolina 29065 O. S. Bradham, Manager Nuclear Operations Post Office Box 8 Jenkinsville. South Carolina 29065
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SSINS:
6830 Accession No: 1908220111 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 Description of Circumstances:
Three reports have been submitted to time 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 D'ike 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 react ar building spray pump (Ingersoll-Rand Type 4X11A) for Oconee Unit No. 3.
The licensee found that the impeller had worked loose.
The corrective actiot.
included a revision to the maintenance 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 Ingersol:-Rand Types W, WD, and WDF pumps. Excerpts from that Technical Engineering, Inc. has, also, informe same problem in a letter dated March Enclosure No. 2.
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