ML19260C654
| ML19260C654 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 12/20/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Millen C PUBLIC SERVICE CO. OF COLORADO |
| References | |
| NUDOCS 8001080224 | |
| Download: ML19260C654 (1) | |
Text
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UNITED STATES TIC
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NUCLEAR REGULATORY COMMISSION NSIC O 'l -
REGloN IV
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December 20, 1979 Docket No. 50-267 Public Service Company of Colorado ATTN:
Mr. C. K. Millen Senior Vice President P. O. Box 840 Denver, Colorado 80201 Gentlemen:
The enclosed IE 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, p. ease contact th'is office.
Sincerely,
/
i 4 Q f p Karl V. Seyfrit g Director
Enclosures:
1.
IE Circular No. 79-25 2.
List of IE Circulars Recently Issued cc:
D. W. Warembourg, Nuclear Production Manager Fort St. Vrain Nuclear Station P. O. Box 368 Platteville, Colorado 80651 L. Brey, Manager, Quality Assurance 1702 181 8001080
SSINS:
6830 Accession No: 7910250514 UNITED STATES D
'3 NUCLEAR REGULATORY COMMISSION
,_J OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 IE Circular No. 79-25 Date: December 20, 1979 Page 1 of 1 SHOCK ARRESTOR STRUT ASSEMBLY INTERFERENCE The Bergen Paterson Pipesupport Corporation reported to the NRC a potential problem with their mechanical 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 civarances. 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 arrestor to function freely, when installed at an off axis angle greater than 83*.
For PSCO shock arrestor size 120 there is insufficient clearance throughout the 180* installation angle.
For PSCO shock arrestor sizes 50 and 120 with Bergen Paterson Adaptor Part 2108 the shock arrestor unit may sustain functional damage when the adaptor unit comes in contact with the rear of the snubber, causing 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 design 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 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 problem.
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 l82
IE Circular No. 79-25 December 20, 1979 RECENTLY ISSUED IE CIRCULARS Circular Subject Date Issued To No.
Issued 79-18 Proper Installation of 9/10/79 All Holders of a Target Rock Safety-Relief Power Reactor Operating Valves License (OL) or Construction Permit (CP) 79-19 Loose Locking Devices on 9/13/79 All Power Reactor Ingersoll-Rand Pumps Licensees with a Construction Permit (CP) and/or Operating Licensee (OL) 79-20 Failure Of GTE Sylvania 9/24/79 All Power Reactor Relay, Type PM Bulletin Licensees with a 7305, Catalog SU12-11-AC Construction Permit (CP)
With A 120V AC Coil and/or Operating Licensee (OL) 79-21 Prevention of Unplanned 10/16/79 All holders of Power Releases of Radioactivity Reactor Operating Licenses (OLs) or Construction Permits (cps) 79-22 Stroke Times,for Power 11/16/79 All Power Reactor Oper-Operated Relief Valves ating Facilities and all Utilities having a Construction Permit (CP) 79-23 Motor Starters and 11/26/79 All Power Reactor Oper-Contactors Failed to ating Facilities and Holders Operate of Reactor Construction Permits (cps) 79-24 Proper Installation and 11/26/79 All Holders of a Calibration of Core Spray Power Reactor Operating Pipe Break Detection License (OL) or Equipment on BWRs.
Construction Permit (CP)
Enclosure 1702 183