ML19260C681
| ML19260C681 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 12/20/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 8001080300 | |
| Download: ML19260C681 (1) | |
Text
b ga "Ecoq'o UNITED STATES l 'i, g
NUCLEAR REGULATORY COMMISSION 2.[ '
- E REGION V o, "
[
1990 N. CALIFORNIA BOULEVARD d
SUITE 202, WALNUT CREEK PLAZA e,,,e WALNUT CREE K, CAllF ORNI A 9459G December 20, 1979 Docket No. 50-312 Sacramento Municipal Utility District P. O. Box 15830 Sacramento, California 95813 Attention: Mr. John J. Mattimoe Assistant General Manager 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,
~.M Y R. H. Engelken Director
Enclosures:
1.
IE Circular No. 79-25 2.
List of IE Circulars Recently Issued cc w/ enclosures:
R. J. Rodriguez, SMUD L. G. Schwieger, SMUD 1702 315 8001080
~
O SSIllS:
6830 Accession No: 7910250514 F ',
y' UNITED STATES ihrm NUCLEAR REGULATORY COMfilSSION 0FFICE OF INSPECTION AND ENFORCEMEllT
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WASHIflGTON, D.C.
20555 December 20, 1979 IE Circular No. 79-25 SH0CK ARRESTOR STRUT ASSEMBLY INTERFERE!!CE The Bergen Paterson Pipesupport Corporation reported to the NRC 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 following problems were identified:
For PSCO shock arrestors sizes 15 and 50, the Bergen 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 83.
For ZSCO shock arrestor size 120 there is insufficient clearance throughout 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 part 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 identif.y 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 Mechanical Shock Arrestor installations with Bergen Paterson Part 2540-15, 25a0-50 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 damaaed or deformed snubber.
Corrective action should be coordinated with the Strut Assembly suoplier (Bergen Paterson) and appropriate resolutions promptly implemented.
1702 316
IE Circular No. 79-25 Enclosure December 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 Operating 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 having 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, Catalog SU12-11-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 Proper Installation of 9/10/79 All Holders of Power Target Rock Safety-Relief Reactor OLs and cps 73-17 Contact Problem in SB-12 8/14/79 All Power Reactor Switches on General Electric Licensees with a CP Company Fetalclad 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 Priori'.y I, and Malfunction of Relief Fuel Cycle and Operatina Valve "0" Ring in Certain Self-Power Reactor Licensees Contained Breathing Apparatus I702 517