ML19242A125
| ML19242A125 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Byron, Braidwood, Quad Cities, Zion, LaSalle  |
| Issue date: | 07/11/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Brian Lee COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 7907310311 | |
| Download: ML19242A125 (1) | |
Text
ka "' %q' t
g 4-o UNITFD STATES PDR'
~
E \\*.[n NUCLEAR REGULATORY COMT11SSION J
'".4/
REGION lit O
o, b
[
,cf GLE N E LLYN. ILLINOIS 60137 JUL 111979 Docket Nos. 50-10, 50-237, 50-249, 50-254, 50-265, 50-295, 50-304, 50-373, 50-374, 50-454, 50-455, 50-456 and 50-457 Commonwealth Edison Company ATTN:
Mr. Byron Lee, Jr.
Vice President Post Gifice Box 767 Chicago, IL 60690 Gentlemen:
The enclosed IE Bulletin No 79-15 is forwarded to you for action.
A written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely, a ok
- James G. Keppler Director
Enclosures:
1.
IE Eulletin No. 79-15 2.
Listing of IE Bulletins Issued in Last 12 Months cc w/ encl:
Mr. B. B. Stephenson, Mr. R. Cosaro, Proj ect Station Superintendent Superintendent Mr. N. Kalivianakis, Central Files Station Superintendent Director, NRR/DPM
- h N. Wandke, Station Director, NRR/ DOR Superintendent PDR Mr. L. J. Burke, Site Local PDR Project Superintendent NSIC Mr. T. E. Quaka, Quality TIC Assurance Supervisor AntLony Roisman, Esq.,
Mr. R. H. Holyoak, Station Attorney Superintendent Mr. Dean Hansell, Office Mr. Gunner Sorensen, Site of Assistant Attorney Project Superintendent General i'
- U 7907310311 I
5
U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT REGION III July 11, 1979 IE Bulletin No. 79-15 DEEP DRAFT PUMP DEFICIENCIES
~~
Description of Circumstances:
On October 20, 1978, Commonwealth Edison Company reported that manufacturing deficiencies had been identified in new high pressure core spray, low pressurr.
core spray, and residual heat removal pu=ps manufactured by Ingersoll-Rand (I-R)
Company, Cameron Pump Division.
Each of these pumps is a vertical turbine pump with impellers located in bowls in a sump or a self contained barrel.
The motor (prime mover) is located at the highest pu=p elevation to take into account maximum flooding at the site
.or space considerations. The suction is at the lower end of the pu=p while the discharge head is just below the driver.
Bearings supporting the vertical shaft segments (usually 5 to 10 segments) are either self lubricated, force fed (lubricated by fluid being pu= ped), or oil lubricated and maintained within their own isolated system. These pumps are designated as " Deep Draf t".
Figures 1&2 show typical outlines of such pu=ps.
The internal deficiencies, identified through dimensional and visual inspections were as follows:
Low Pressure Core Spray Pu=ps (I-R Model No. 29APKD-5 ) (Date of Manufacture -
Feburary 1973)
Loose impeller bolts and bolts improperly staked Loose key - keyway fit Excessive runout on pu=p shaft Bearing showed wear Bearing clearance exceeded recommended tolerance Coupling thread galled Wear ring clearance out-of-specification Impeller-to-shaft clearance out of specification Cracks found in second-and-third-stage impellers Stuffing box bushings were severely galled High Pressure Core Spray Pumps (I-R Model No. 3 ?v207"b. /" - c'"
September 1972)
DUPLICATE DOCUMENT Bearing clearance exceeded recommended tol l
Wear ring clearance out-of-specification Entire document previously entered
.4 Bearings showed wear into system under:
f ANO h
F
~,; <
./
No. of pages:
.. -.