ML19209A123
| ML19209A123 | |
| Person / Time | |
|---|---|
| Site: | Hatch, Vogtle  |
| Issue date: | 09/13/1979 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | John Miller GEORGIA POWER CO. |
| References | |
| NUDOCS 7910020585 | |
| Download: ML19209A123 (1) | |
Text
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UNITED STATnS NUCLEAR REGULATORY COMMISSION o
E REGION 11 o
101 MARIETTA ST., N.W., SL"TE 3100 Yg o
ATLANTA, GEORGIA EA33 In Reply Refer To:
SEP 131979 UW4 RII:JP0 50-321
,50-36Q]
50-424 50-425 s.
p-Georgia Power Company Attn:
J. H. Miller, Jr.
Executive Vice President 270 Peachtree Street Atlanta, Georgia 30303 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, JameiI.O'Reill Director
Enclosures:
1.
IE Circular No. 79-19 2.
List of IE Circulars Issued in the Last Six Months 6
- 1136 057 7910020 Sg5
SEP 131979 Georgia Power Ccmpany cc w/ enc 1:
M. Hanry, Plant Manager Post Office Box 442 Baxley, Georgia 31513 C. E. Belflower Site QA Supervisor Post Office Box 442 Baxley, Georgia 31513 K. M. Gillespie Construction Project Manager Post Office Fox 282 Waynesboro, Georgia 30830 E. D. Groover QA Site Supervisor Post Office Box 282 Waynesboro, Georgia 30830
' [136 058
SSINS:
6830 Accession No: 7908220111 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 September 13, 1979 IE Circula r 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 The licensee's corrective action involved the installation of, Type 8X20WD).
a tab washer. This corrective action was, also, taken on the containment spray pumps (Ingersoll-hand 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 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 has issued a Technical Bulletin to Westing-house plant owners on loose lock nuts on Ingersoll-Rand Types W, WD, and WDF pumps. Excerpts f rom that Technical Bu' '-- --- '- "- ' ---- "-
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Engineering, Inc. has, also, informed t same problem in a letter dated March 12 Enclosure No. 2.
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