ML17296A796
| ML17296A796 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 07/03/1980 |
| From: | ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | |
| Shared Package | |
| ML17296A795 | List: |
| References | |
| NUDOCS 8007140341 | |
| Download: ML17296A796 (2) | |
Text
INTERDf REPORT POTENTIAL REPORTABLE DEFICIENCY ARIZONA PUBLIC SERVICE COMPANY (APS)
PVNGS UNITS 81 AND f12 I
Potential Problem Ruskin Vertical Fire Dampers have been modified in accordance with two (2) 10CFR Part 21 Reports applying two different de-sign corrections (f36 screw and spring clip addition).
The present mode of failure appears to be lack of design toler-ance on sheet metal sides wherein a minor distortion (bow) pre-vents full closure of the damper door, when'the fuse link is separated.
II A
roach To and Status 'of"Pro osed Resolution Due to warpage and bowing of some Ruskin Fire Dampers, some of the assemblies failed to pass the functional test performed by Bechtel's HVAC subcontractor, The Waldinger Corporation.
The definitive cause of this condition has not yet been determined and accepted by all parties concerned.
The Waldinger Corporation has issued Nonconformance Report No.
289. to identify and return to Ruskin the identified inoperative fire dampers.
Bechtel has been notified by Waldinger that Ruskin Manufacturing Company is conducting tests and implementing design changes which would, reduce or eliminate th'e warpage and bowing of the dampers from welding operations and/or shipping.
The Wal-dinger Corporation and Ruskin Manufacturing Company are in the process of evaluating whether the existing installed dampers which previously passed the cycling test must be backfitted with this new modification to assure operability.
III Pro'ected Com letion of Corrective Action and Submittal Date of the Final Re'ort Sufficient information is expected to be available to issue a
Final Report by September 15, 1980.
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