ML20215D272
| ML20215D272 | |
| Person / Time | |
|---|---|
| Issue date: | 12/11/1986 |
| From: | Baer R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | Philips M NUCLEAR UTILITY GROUP ON EQUIPMENT QUALIFICATION |
| References | |
| NUDOCS 8612160300 | |
| Download: ML20215D272 (2) | |
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UNITED STATES NUCLEAR REGULATORY COMMISSION O
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DEC 11 1996 Nuclear Utility Group on Equipment Qualification Suite 800 1200 17th Street, N.W.
Washington, DC 20036 ATTENTION: MALCOLM H. PHILIPS Gentlemen:
SUBJECT:
IMPROPER INSTALLATION OF RAYCHEM HEAT SHRINKABLE TUBING Recent telephone conversations and meetings between members of the Nuclear Utility Group on Equipment Qualification (NUGEQ) and NRC staff have been productive regarding qualification of Raychem Corporation's heat shrink / product for electrical cable splices.
However, to facilitate the NRC staff's further assessment of the safety significance and generic implications, we are request-ing any specific information you may have regarding the type and frequency of deviations from Raychem's specifications and the test data that may show these deviations to be acceptable.
The NRC staff would like a detailed summary of the NUGEQ's evaluation of concerns identified at the power plants within the scope of its review.
This summary should include if available the number of electrical connections inspected at each plant, the deviations per concern, and the number of electri-cal connections repaired or replaced at each plant.
It would be helpful if this list included such deviations as:
insufficient seal length overlap of heat shrinkable tubing for single conductor and multi-conductor connections.
the maximum deviation allowed for cable bend radius as compared to the accepted manufacturer recommendation, questionable sealing capabilities of the heat shrinkable tubing when applied to woven or metal braided substrates.
the maximum deviation regarding use range (inside diameter of the tubing) when tubing is applied to bolted splice hardware or regular in-line butt splice connections, and installations found to have improperly heated tubing information whether any problems of bare conductors or split heat shrink-able tubing were found i
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a Malcolm H. Phillips If this information has already been provided to the NRC in a report submitted pursuant to the provisions of 10 CFR 50.55(e) or 10 CFR 50.73, a reference to these reports will be sufficient.
Also we would appreciate your providing a summary and detail information pertaining to supporting qualification tests that have been completed, are ongoing or planned, to resolve the deviation concerns identified at the partic-ipating power plants. Copies of these reports are necessary for us to substan-tiate the qualified status of previously identified deviations that were upgraded or corrected. To the extent possible, please provide a tabulation showing the relationship between these qualification tests and the deviations identified during the inspections.
From the above requested information the NRC will determine if additional generic communication to licensees is appropriate and if so, the information will also help us to accurately specify the required licensee actions.
In this regard, it may be appropriate to exempt those plants that have performed adequate inspections and have either corrected identified deficiencies or can justify the qualification of the uncorrected as-found splices. We would appreciate a NVGEQ recommendation as to what in your view constitutes adequate actions on the part of a plant having Raychem heat shrinkable tubing.
We recognize that some of the information requested above may not be readily available, and that your resources are limited for providing the requested detailed data.
If this is the case, an early response indicating what informa-tion can be made available and your estimate of when it could be provided to the NRC staff would be appreciated. Should you have any questions concerning this matter, please call Vincent Thomas of my staff on (301) 492-4755 or me at (301)492-4780.
Sincerely, Robert L. Baer, Chief Engineering ant Generic Comunications Branch Division of Emergency Preparedness and Engineering Response Office of Inspection and Enforcement DISTRIBUTION JMiaylor, IE RWStarostecki, IE ELJordan, IE SASchwartz, IE RLBaer, IE AWDromerick, IE VDThomas, IE JGPartlow, IE BKGrimes, IE RHeishman, IE GHubbard, IE GGower, IE SStein, IE UPotapovs, IE JCalvo, NRR JShemanski, NRR PDR DCS DEPER R/F EGCB R/F VThomas R/F EGCB:DEPER:IE EGCB:DEPER:IE C:EGCB:DEPER:IE VDThomas /g/
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