ML19209A124
| ML19209A124 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 09/13/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Stampley N MISSISSIPPI POWER & LIGHT CO. |
| References | |
| NUDOCS 7910020586 | |
| Download: ML19209A124 (1) | |
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UNITED STATES 8
NUCLEAR REGULATORY COMMISSION IMMil o
.t REGION II 101 MARfETTA ST N.W SUITE 3100 o
ATLANTA. GEORGIA 30303 In Reply Refer To:
RII:JPO C50T16 ^
QO-417 Mississippi Power and Light Company Attn:
N. L. Stampley Vice President of Production P. O. Bnx 16l.0 Jackson, Kississippi 39205 Gentlemen:
The a.nclosed IE Circular No. 79-19, is forwarded to fou for information.
No written response is required.
Should you have any questions related to your understanding of this matte.r, please contact this office.
Sincerely, JhesN,Oi eill Director
Enclosures:
1.
1E Circular No. 79-19 2.
List of IE Circulars Issued in the Last Six Mor.ths M
791oo20 596 f136 054
SEP 131979 HississiPPi Power and Light Company cc w/ enc 1:
C. K. McCoy Plant Manager Post Office Box 756 Port Gibson, Mississippi 39150 1136 055
SSINS:
6830 Accession No: 7908220111 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 5eptember 13, 1979 IE Circular No. 79-19 LOOSE LOCKING DEVICES ON INGERSOLL-RAND P'MP IMPELLERS Description of Circunstances:
Three reports have been submitted to the NRC re,arding the loosening of locking devices on the impellers of pumps manufactured bl "he Ingersoll-Rand Company.
The first report was submitted as a significant aeficiency (10 CFR 50.55[el) by Arkansas Power and Light Company in letters of March 17, 1970 sad May 9, 1978. The licensee reported excessive noise and vibrations in both Low Pressure Safety Injection (LPSI) pumps during the Ireoperational test program on Unit 2 of Arkansas Nuclear One (ANO).
It was uiscovered 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 etion was, also, taken on the containment spny pumps (Ingersoll-Rand Type 6A23WD) because of similarity of design.
The second report was submitted by Duke Power Company in a licensee event report (LER 5)-287/78-23) dated January 24, 1979. The symptoms were similar to those observed at ANO Unit 2 in that high vibratiot 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 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 (?dIR) 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 Ingersoll-Rand Types W, WD, and WDF pumps. Excerpts from that Technical Bu Engineering, Inc. has, also, informe same problem in a letter dated March
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Enclosure No. 2.
DUPLICATE DOCUMENT j}gh Entire document previously entered into system u der ANO No. of pages: _}}