ML19249E845
| ML19249E845 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 09/13/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Groce R VERMONT YANKEE NUCLEAR POWER CORP. |
| References | |
| NUDOCS 7910020558 | |
| Download: ML19249E845 (1) | |
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Docket No. 50-29 SEP i 3 yg t
Yankee Atomic Electric Company ATTN:
Mr. Robert H. Groce Licensing Engineer 20 Turnpike Road Westborough, Massachusetts 01581 Gentlemen:
The enclosed IE Circular No. 79-19, is forwarded to you for information.
No written resp Mse is required.
Should you have any questions related to your understanding of this matter, please contact this office.
Sincerely, f
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hffs OAw oyce H. Grier
' Director
Enclosures:
1.
IE Circular No. 79-19 2.
List of IE Circulars Issued in the Last Six Months cc w/encls:
H. Autio, Plant Superintendent L. E. Minnick, President 1069 077 7910020 S rf 9
ENCLOSURE 1 SSINS:
6830 Accession No: 7908220111 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 IE Circular No. 79-19 Date:
September 13, 1979 Page 1 of 2 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 (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 submittet 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 AN0 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 DivisionI
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Westinghouse plant owners on loose lo oupLICATE DOCUMELT, and WDF pumps.
Excerpts from that Te i Combustion Engineering, Inc. has also iEntire document Previously entered to the same problem in a letter dated 4into system under:
letter are in Attachment No. 2.
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