ML19260C659
| ML19260C659 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 12/20/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Arenal A SOUTHERN CALIFORNIA EDISON CO. |
| References | |
| NUDOCS 8001080253 | |
| Download: ML19260C659 (1) | |
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'o, UNITED STATES 5 c" 3,! j' ' '-
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1990 N. CALIFORNIA BOULEVARD
,e SUITE 202, WALNUT CREEK PLAZA WALNUT CR E E K, CALIFORNI A 94596 December 20, 1979 Docket tios. 50-206, 50-361 50-362 Southern California Edison Company P. O. Box 300 2244 Walnut Grove Avenue Rosemead, California 91770 Attention: Mr. A. Arenal, Vice President Advanced Engineering Gentlemen:
The enclosed Circular 79-25 is forwarded to you for information.
flo written response to this Circular is required.
If you require additional information regarding this subject, please contact this office.
Sincerely, Ih5, xpf R. H. Engelken Director
Enclosures:
1.
IE Circular fio. 79-25 2.
List of IE Circulars Recently Issued cc w/ enclosures:
J. M. Curran, SCE J. T. Head, SCE J. H. Drake, SCE 1702 221 1N 8001080
SSI!lS:
6830 Accession flo: 7910250514 Ut1ITED STATES Pnl D
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flUCLEAR REGULATORY COMf11SSI0ft OFFICE OF IfiSPECTIO!! AtlD EflFORCEMEflT
,i WASHIflGT0ft, D.C.
20555 December 20, 1979 IE Circular No. 79-25 SH0CK ARRESTOR STRUT ASSEf'BLY IflTERFEREflCE The Bergen Paterson Pipesupport Corporation reported to the flRC a potential problem with their nechanical shock arrestor
" Strut Assembly." The Berqen Paterson, Part 2540 Strut Assembly, is being used as a rear bracket for different sizes of Pacific Scientific Company (PSCO) mechanical shock arrestors.
Some of these shock arrestor sizes may not function as intended due to insufficient clearances.
The followino problems were identified:
For PSCO shock arrestors sizes 15 and 50, the Berqen Paterson Part 2540 Strut Assembly does not provide sufficient clearance for the shock arrestof to function freely, when installed at an off axis angle areater than 8T.
For ZSCO shock arrestor size 120 there is insufficient clearance throuahout the 180 installation anale.
0 For PSCO shock arrestor sizes 50 and 120 with Beroen Paterson Adaptor Part 2108 the shock arrestor unit may sustain functional damaae when the adaptor unit comes in contact with the rear of the snubber, causino distortion of the end dust cover.
PSCO shock arrestors sizes
.35,
.65, 1.5 and 6 do not have this interference condition and therefore are not part of the potential problen of this circular.
Bergen Paterson stopped shipment as of October 1979 of all Part 2540-15, 2540-50, and 2540-120 strut assemblies and is reviewing all applicable desian detail drawings, to identify all affected itens and the facilities to which those itens have been delivered.
Licensees and holders of construction permits are advised to proceed with the inspection of Pacific Scientific Mechanical Shock Arrestor installations with Bergen Paterson Part 2540-15, 2540-50 and 2540-120 Strut Assemblies and deter-mine whether any of the following conditions are applicable:
1.
The shock arrestor installation orientation presents a possible interference oroblem.
2.
Inspection of shock arrestors 50 and 120 with adaptor show damaced or deformed snubber.
Corrective action should be coordinated with the Strut Assembly sunplier (Bergen Paterson) and aporopriate resolutions promptly implenented.
1702 222
4 IE Circular No. 79-25 Enclosure Decenber 20, 1979 RECENTLY ISSUED IE CIRCULARS Circular Subject Date of Issued to No.
Issue 79-24 Proper Installation and 11/26/79 All Holders of a Calibration of Core Spray Power Reactor OL or Pipe Break Detection CP Equipment on BWRs.
79-23 Motor Starters and 11/26/79 All Power Reactor and Contactors Failed Operatina Facilities and Holders of to Operate Reactor cps 79-22 Stroke Times for Power 11/16/79 All Power Reactor Operated Relief Valves Operatinq Facilities and all Utilities havina a CP 79-21 Prevention of Unplanned 10/19/79 All holders of Power Releases of Radioactivity Reactor OLs and cps 79-20 Failure of GTE Sylvania 9/24/79 All holders of Power Relay, Type PM Bulletin Reactor OLs and cps 7305, Cataloq SU12-11-AC with a 12V AC Coil 79-19 Loose Lockinq Devices 9/13/79 All Holders of Power on Ingersoll-Rand Pumps Reactor OLs and cps 79-18 Proper Installation of 9/10/79 All Holders of Power Target Rock Safety-Relief Reactor OLs and cps 79-17 Contact Problem in SB-12 8/14/79 All Power Reactor Switches on General Electric Licensees with a CP Company Petalclad Circuit and/or OL Breakers 79-16 Excessive Radiation Exposures 8/16/79 All Radiography To Membars Of The General Public Licensees And A Radiographer 79-15 Bursting of High Pressure Hose 8/8/79 All Materials Priority I, and Malfunction of Relief Fuel Cycle and Operatina Valve "0" Rina in Certain Self-Power Reactor Licensees Contained Breathinq Apparatus 1702 223