ML19209A117
| ML19209A117 | |
| Person / Time | |
|---|---|
| Site: | Atlantic Nuclear Power Plant  |
| Issue date: | 09/13/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Collier A OFFSHORE POWER SYSTEMS (SUBS. OF WESTINGHOUSE ELECTRI |
| References | |
| NUDOCS 7910020567 | |
| Download: ML19209A117 (1) | |
Text
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'o UNITED STATES 8
NUCLEAR REGULATORY COMMISSION o
g e
REGION 11 a'#
101 MARIETTA ST N.W., SUITE 3100 oYg o
ATLANTA, GEORGIA 30303 i
In Reply Refer To:
SEP 131979 RII:JP L Offshore Power Systems Attn:
A. R. Collier, President P. O. Be < 8000 Jacksonville, Florida 32211 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 undarstanding of this matter, please contact this office.
Sincerely, Jam R
Director
Enclosures:
1.
IE Circular No. 79-19 2.
List of IE Circulars Issued in the Last Six Months n36 066 ~
701002 0 $7
SSINS:
6830 Accession No: 7908220111 UNITED W.TES NUCLEAR REGULAToi' 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 (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 repo:t was submitted by Duke Power Company in a licensee event report (LER 50-2't7/78-23) 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 puup (Ingersoll-Rand Type 4X11A) fo 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 n quirements.
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 Tvpe 6X23WD) in that there is a potential for the impeller lock nut to looren.
fhe 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.
WestinghouseNuclearServiceDivisicj Jg-house plant. owners on loose lock na q pumps. Excerpts from that Technica Engineering, Inc. has, also, informc] DUPLICATE DOCUMENT l
same problem in a letter dated Marcl Entire document previously entered Enclosure No. 2.
into system under:
ANO No. of pages:
U 36 067 w__