ML20050C198
| ML20050C198 | |
| Person / Time | |
|---|---|
| Site: | 05000000 |
| Issue date: | 06/19/1981 |
| From: | Udall M HOUSE OF REP., INTERIOR & INSULAR AFFAIRS |
| To: | Hendrie J NRC COMMISSION (OCM) |
| Shared Package | |
| ML20050C153 | List: |
| References | |
| RTR-NUREG-CR-1681 NUDOCS 8204080265 | |
| Download: ML20050C198 (1) | |
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8 f WdETY-SEVENTH CONGRESS CHARLES CO.ewLIN MOR2"3 K. UDAL&. AAf1 CHAIRMAN sTs.sesp R. wi st$e cJatt.
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lll:'l 'A""" ", O The lionorable Joseph IIendrie Chairman, Nuclear Regulatory Commission Washington, D.C.
20515
Dear Mr. Chairman:
We have recently received a Sandia National Laboratories Report,
" Electrical Insulators in a Reactor Accident Environment,"
This report indicates that for small steam breakout accidents, in the absence of " flow retarding breathers,"
electrical terminals mounted in protected boxes, ".
. will show leakage currents, noise, and an approximately 1% breakdown rate."
The report concludes that unprotected terminals would experience a significantly higher failure rate than would protected terminals.
The report also states that for the design basis LOCA, about 14% of protect'ed terminals are expected to break down within the first 10 minutes.
The Sandia data suggests, in the face of a design basis LOCA, that up to 30% of unprotected terminals would experience electrical breakdowns.
The Sandia report concludes that, " Terminal blocks are apparently the weakest link of the electrical system inside a reactor containment building.
The concern for their use in safety related (lE) terminals is absolutely justified."
Finally, the Sandia report makes several recommendations for a substantial number of corrective measures.
I would appreciate your providing me a statement of the Commission's position with regard to the Sandia conclusions and recommendations, and a statement including a schedule for actions to be taken to correct deficiencies of a kind indicated by the Sandia research.
i cerely, MORRIS K. UDALL Chairman 8204000265 820322 PDR ADOCK 05000244 T