ML19260C657
| ML19260C657 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 12/20/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Goodwin C PORTLAND GENERAL ELECTRIC CO. |
| References | |
| NUDOCS 8001080249 | |
| Download: ML19260C657 (1) | |
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o UNITED STATES 5\\f ) '.,, 7 i
NUCLEAR REGULATORY COMMISSION
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REGION V
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1590 N. CALIFORNIA BOULEVAR7 O
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SUITE 202, WALNUT CREEK PLAZA
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WALNUT CREE K, CALIFORNI A 94596 December 20, 1979 Docket No. 50-344 Portland General Electric Company 121 S. W. Salmon Street Portland, Oregon 97204 Attention: Mr. Charles Goodwin, Jr.
Assistant Vice President Gentlemen:
The enclosed Circular 79-25 is forwarded to you for information.
No written response to this Circular is required.
If you require additional information regarding this subject, please contact this office.
Sincerely,
>, ed.L-R. H. Engelken Director
Enclosures:
1.
IE Circular No. 79-25 2.
t.ist of IE Circulars Recently Issued cc w/en..osures:
C. P. Yundt, PGE F. C. Gaidos, PGE 1702 199 8001080 l t.{.g
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6830 Accession No: 7910250514 UtlITED STATES T
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NUCLEAR REGULATORY COMMISSION
- g 0FFICE OF INSPECTI0fl AND ErlFORCE!!ErlT WASHIflGTON, D.C.
20555 December 20, 1979 IE Circular No. 79-25 SH0CK ARREST 0R STRUT ASSEMBLY INTERFERENCE The Bergen Paterson Pipesupport Corporation reported to the flRC a potential problem with their nechanical shock arrestor
" Strut Assembly." The Bergen 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 following 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 arrestog to function freely, when installed at an off axis angle areater than 87.
For ZSCO shock arrestor size 120 there is insufficient clearance throughout 0
the 180 installation anale.
For PSCO shock arrestor sizes 50 and 120 with Beraen 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, causina 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 nart of the potential problem 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 items and the facilities to which those items have been delivered.
Licensees and holders of construction permits are advised to proceed with the inspection of Pacific Scientific fiechanical Shock Arrestor installations with Berqen Paterson Part 2540-15, 2540-50 and 2540-120 Strut Assemblies and deter-mine whether any of the followinq 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 damaged or deformed snubber.
Corrective action should be coordinated with the Strut Assembly supplier (Bergen Paterson) and appropriate resolutions promptly implemented.
1702 200
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IE Circular flo. 79-25 Enclosure December 20, 1979 RECEllTLY ISSUED IE CIRCULARS Circular Subject Date of Issued to flo.
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 Eouipment on BWRs.
79-23 fiotor Starters and 11/26/79 All Power Reactor and Contactors Failed Operatina Facilities to Operate and Holders of Reactor cps 79-22 Stroke Times for Power 11/16/79 All Power Reactor Operated Relief Valves Operating Facilities and all Utilities havina a CP 79-21 Prevention of Unplanned 10/19/79 All holders of Power Releases of Radio,ctivity 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 5U12-11-AC with a 12V AC Coil 79-19 Loose Locking Devices 9/13/79 All Holders of Power on Ingersoll-Rand Pumps Reactor OLs and cps 79-18 Propar Installation of 9/10/79 All Holders of Power Tarcet 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 t'etalclad 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 Hiqh Pressure Hose 8/8/79 All Materials Priority I, and fialfunction of Relief Fuel Cycle and Operatina Valve "0" Ring in Certain Self-Power Reactor Licensees Contained Breathing Apparatus 1702 201