ML19260C656
| ML19260C656 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay, Diablo Canyon |
| Issue date: | 12/20/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 8001080247 | |
| Download: ML19260C656 (1) | |
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NUCLEAR REGULATORY COMMISSION 5 /-
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1990 N. CALIFORNIA BOULEVARD
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SulTE 202, WALNUT CREEK PLAZA
- ,,,o WALNUT CR EEK, CALIFORNIA 94596 December 20, 1979 Docket flos. 50-133, 50-275 50-323 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94106 Attention: Mr. Philip A. Crane, Jr.
Assistant General Counsel 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, j(2 U,.5<f S ~
R. H. Engelken Director
Enclosures:
1.
IE Circular No. 79-25 2.
List of IE Circulars Recently Issued cc w/ enclosures:
W. Barr, PG&E W. Raymond, PG&E R. Ramsay, PG&E, Diablo Canyon E. Weeks, PG&E, Humboldt Bay J. Worthington, PG&E 1702 196 8001080 2'9 9
a SSIflS: 6830 Accession No: 7910250514 c'
UNITED STATES
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<b NUCLEAR REGULATORY C0"filSSION E
m OFFICE OF If;SPECTION AfiD EllFORCEf'EllT WASHIrlGTON, D.C.
20555 December 20, 1979 IE Circular No. 79-25 SHOCK CRRESTOR STRUT ASSEPSLY INTERFEREllCE 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 beino used as e rear bracket for different sizcs of Pacific Scientific Company (PSCO) mechanical shock arrestors. Some of these shock arrestor sizes may not function as intended due to insufficient cl earances. The following problems were identified:
For PSCO shcck arrestors sizes 15 and 50, the Bergen Paterson Part 2540 Strut Assenbly does not provide sufficient clearance for the shock arrestor to function freely, when installed at an off axis angle creater than 83'.
For ZSCO shock arrestor size 120 there is insufficient clearance throuahout 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 damace 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 baen 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, 25d0-50 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.
Inscection of shock arrestors 50 and 120 with adaptor show damaaed or deformed snubber.
Corrective action should be coordinated with the Strut Assembly suoplier (Bergen Paterson) and aporopriate resolutions promptly imr'enented.
1702 197
IE Circular No. 79-25 Enclosure Cecember 20, 1979 RECENTLY ISSUED IE CIRCULARS Circular Subject Date of Issued to No.
Issue 79-24 Proner 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 Operating Facilities and all Utilities havino 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 Inqersoll-Rand Pumps Reactor OLs and cps 79-18 Proper Installation of 9/10/79 All Holders of Power Target Pock 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 01.
Breakers 79-16 Excessive Radiation Exposures 8/16/79 All Radiaqraphy 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 Operatinq Valve "0" Ring in Certain Self-Power Reactor Licensees Contained Breathinq Apparatus 1702 198