ML17193A279
| ML17193A279 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 08/17/1973 |
| From: | US ATOMIC ENERGY COMMISSION (AEC) |
| To: | |
| Shared Package | |
| ML14097A316 | List: |
| References | |
| IEB-73-04, IEB-73-4, NUDOCS 7904200087 | |
| Download: ML17193A279 (2) | |
Text
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DEFECTIVE BERGEN-PATERSON HYDRAULIC SHOCK ABSORBERS INFORMATION August 17, 1973 Directorate of Regulatory Operations Bulletin 73-4 Reference is made to Regulatory Oper'ations Bulletin 73-3, dated July 27, 1973, entitled DEFECTIVE HYDRAULIC SHOCK ABSORBERS AND RESTRAINTS which provided information on known problems with hydraulic shock absorbers and which requested actions, including inspections of installed hydraulic shock absorbers, by certain utilities.
The compiled results of these inspections of Bergen-Paterson shock absorbers, based on telephone reports from affected licensees to the five Regional Offices of the Dire~torate of Regulatory Operations, reveal that a large percentage of installed Bergen-Paterson hydraulic shock absorbers were_ not fully operational.
In addition, preliminary information indicates tpat routine repairs, replacing defective seals and filling hydraulic oil reservoirs may not be an adequate long range solution to this problem.
There is also some indication that deterioration of the affected hydraulic shock absorbers can occur over a relatively short period of time (less than 90 days).
ACTION INDICATED
- 1.
Schedule.a reinspection of Bergen-Paterson hydraulic shock absorbers installed in safety related systems to be conducted approximately 45 days and no longer than 90 days after the pl_ant has been at. operating temperature subsequent to the inspection performed as requested in RO Bulletin 73-3.
- 2.
The inspection should include the following:
- a.
Determination of condition.of seals.
- b.
Verification of overall integrity of shock absorber assemblies.
- c.
Examination for loss of fluid, fluid leaks, and other signs of distress.
- d.
Recording of piston.rod extension and fluid level indicator positions.
- 3.
Inform this office of the planned date for reinspection of the Bergen-Paterson hydraulic shock absorbers.
- 4.
Provide this office with a prompt telephone report of the significant findings of this reinspection.
If defective shock absorbers are identified, a written report should be submitted to this office within 10 days following completion of the inspection; if no defective shock absorbers ar~ identified, the written report should be submitted within 30 days following the completion of the inspection.
- 5.
The written report should include the following:
- a.
As appropriate for each defective shock absorber identified, a description of the mode of failure, corrective action and tests performed to determine the adequaty of the repair.
- b.
A description of the program for the development and subsequent installation of a permanent modification to the hydraulic shock absorber installation to assure proper operation.
The description should include the technical basis for the conclusion that deficiencies in the Bergen-Paterson hydraulic shock absorbers have been resolved.
'