ML20064C201
| ML20064C201 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 12/30/1982 |
| From: | William Jones OMAHA PUBLIC POWER DISTRICT |
| To: | Clark R Office of Nuclear Reactor Regulation |
| References | |
| LIC-82-416, NUDOCS 8301040343 | |
| Download: ML20064C201 (2) | |
Text
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Omaha Public Power District 1623 HARNEY e OMAHA. NEBRASKA 68102 m~ TELEPHONE 536 4000 AREA CODE 402 December 30, 1982 LIC-82-416 Mr. Robert A. Clark, Chief U. S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation Division of Licensing Operating Reactors Branch No. 3 Washington, D.C.
20555
Reference:
Docket No. 50-285
Dear Mr. Clark:
Environmental Qualification of Safety Related Electrical Equipment in a Harsh Environment to Omaha Public Power District's letter dated September 9, 1982 identified the outstanding items that remain to be completed for the subject issue for the Fort Calhoun Station.
Specifically, Item 2 involved the qualification testing of the Conax electrical containment penetrations and the District stated that this testing was expected to be completed by Janucry 1, 1983.
The purpose of this letter is to provide a status update and revise the completion schedule for the electrical penetration testing.
Testing of the subject penetrations was proceeding on schedule until recently, when significant leakage was measured during pressure testing at LOCA pressure.
This leakage occurred after the penetrations were subjected to accelerated aging and initial analysis indicates that the abnormally high temperature administered to the penetrations during this aging was the mechanism for failure.
The penetrations' manufacturer, the test laboratory, and the Dis-trict are presently conducting a thorough analysis to verify that the failure was caused by the accelerated aging process. After completion of this analysis, another complete test of new sample penetrations will be conducted to ensure proper penetration operability. The District expects the failure evaluation to be completed during February, 1983 and will inferm the Commission at that time of the results of the evaluation and the schedule for retesting another set of penetrations.
8301040343 821230 PDR ADOCK 05000285 P
Mr. Robert A. Clark LIC-82-416 Page Two i
The District would like to emphasize that all Conax penetrations installed at the Fort Calhoun Station have exhibited no unusual leakage during periodic leakage testing over the last nine years of plant operation. All electrical penetrations were just recently leak tested during the present refueling outage and all but one penetration had no detectable leakage. The penetration that did have observed leakage was determined to be leaking at a loose fitting -and was appropriately re-paired. The District believes that since failure of the test pene-tration occurred in a laboratory environment and our experience with the installed penetrations has been excellent, continued operation of the Fort Calhoun Station is justified.
Since ly, j
si W. C.
ones Divis on Manager Production Operations WCJ/TLP:jmm i
cc: LeBoeuf, Lamb, Leiby & MacRae i
1333 New Hampshire Avenue, N.W.
1 Washington, D.C.
20036 l
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