ML19249E816
| ML19249E816 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 09/13/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Andognini C BOSTON EDISON CO. |
| References | |
| NUDOCS 7910020507 | |
| Download: ML19249E816 (1) | |
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UNITED STATES y y)e g
NUCLEAR REGULATORY COMMISSION O J~ \\ ".. [
631 PARK AVENUE E
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KING oF PRUSSIA, PENNSYLVANIA 19406
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Docket No. 50-293 SEP13 1373 Boston Edison Company M/C Nuclear ATTN:
Mr. G. Carl Andognini, Manager Nuclear Operations Department 800 Boylston Street Boston, Massachusetts 02199 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,
_ m j
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Boyce H. Grier
- Director
Enclosures:
1.
IE Circular No. 79-19 2.
List of IE Circulars Issued in the Last Six Months cc w/encls:
P. J. McGuire, Pilgrim Station Manager A. Z. Roisman, Natural Resources Defense Council 1072 064 7910020 d
ENCLOSURE 1 SSINS:
6830 Accession No: 7908220111 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20',55 IE Circular No. 79-19 Date:
September 13, 1979 Page 1 of 2 LOOSE LOCKING DEVICES ON INGERSOLL-RAND PUMP IMPFLLERS 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 Pcwer Company in a licensee event report (LER 50-287/78-23) dated January 24, 1979.
The symptoms were similar to those o' served at ANO Unit 2 in that high vibration was detected in a o
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 Gwwwm
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Westinghouse plant owners on loose locl DUPLICATE DOCUMENT and WDF pumps.
Excerpts from that Tecl J
Combustion Engineering, Inc. has also Entire document previously entered to the same problem in a letter dated f 6i nto system under:
a letter are in Attachment No. 2.
ANO pm u 9
No. of Pages:
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