ML19209A118
| ML19209A118 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 09/13/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Clayton F ALABAMA POWER CO. |
| References | |
| NUDOCS 7910020568 | |
| Download: ML19209A118 (1) | |
Text
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UNITED STA *IS NUCLEAR REGULATORY COMMISSION i
E REGION II g,****[,/
ici MAnitv7A sr N W SUITE 3100 o,,
ArtAuTA,aEona A 3o30s SEP 131979 6
In Reply Refer To:
RII-0-348 c
364 50-Alabama Power Company Attn:
F. L. Clayton Senior Vice President Post Offici.. Box 2641 Birmingham, Alabama 35291 Gentlemen:
The enclosed I'd Circular No. 'i9-19, is forwarded to you for information.
No written response is required. Should you have any questions related to your understanding of thic matter, please contact this offica.
Sincerely, Janies
. O' eill Director
Enclosures:
1.
IE Circular No. 79-19 2.
List of IE Circulars Issued in the Last Six Months I136 0;is M
.e 910020 sg p
SEP 131979 Alabama Power Company,
cc w/ enc 1:
A. R. Barton Executive Vice President Post Office Box 2641 Birmingham, Alabama 35291 J. T. Young Vice President-Production Post Office Box 2641 Birmingham, Alabama 35291 C. Biddinger, Jr.
Manager-Corporate Quality Assurance Post Office Box 2641 Birmingham, Alabama 35291 H. O. Thrash Manager-Nuclear Generation Post Office Box 2641 Birmingham, Alabama 35291 H. G. Hairston, III Plant Manager Drawer 470 Ashford, Alabama 36312 R. E. Hollands, Jr.
QA Supervisor Posc office Box U Ashford, Alabama 36312 1136 069 M
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SSINS:
6830 Accession No: 7908220111 UNITED STATES NUCLE!'1 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 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 (AN0).
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 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 cortainment 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 8X20VD) 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 pumps. Excerpts from that Technical B E.
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Engineering, Inc. has, also, informed DUPLICATE DOCUMENT same problem in a letter dated March 1 i
Enclosure No. 2.
Entire document previously entered into system under:
h Jf Q]Q ANO L
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