ML19295C005
| ML19295C005 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Byron, Braidwood, Quad Cities, Zion, LaSalle  |
| Issue date: | 01/30/1978 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Brian Lee COMMONWEALTH EDISON CO. |
| References | |
| NUDOCS 8010150707 | |
| Download: ML19295C005 (1) | |
Text
4 CENTR 4DJ[gg JAU 3~01978 Docket Hos. 50-10, 50-237, 50-249, 50-254, 50-265, 50-295, 50-304, 50-373, 50-374,40-454, 50-455, 50-456, 50-457 Coc=onwealth Edison Co~:pany l'TTH:
Mr. Byron Lee, Jr.
Vice President i.
P. O. Box 767 V
Chicago, IL 60690 4
Gentlemen:
.1 Enclosed is IE Bulletin No. 78-02 which requires action by you uith regard to your poner reactor facilities with an operating license or a construction pernit.
I Should you have questions regarding this Bulletin or the actions l
required of you, please contact this office.
P-Sincerely,
(
James G. Keppler i
Director
'b t
Enclosures:
1.
IE Eulletin No. 78-02 2.
List of IE Eulletins
!ssued in 1978 cc w/cncls:
Mr. B. B. Stephenson, M;. R. Cosaro, Project Station Superintendent Superintendent Mr. N. Kalivianakis, Central Files Station Superintendent Reproduction Unit NRC 20b Mr. N. Wandhe, Station PDR Superintendent Local PDR Mr. L. J. Burke, Site USIC i
Project Superintendent TIC Mr. Gunnar Sorensen, Site Anthony Roisman, Esq.,
Project Superintendent Attorney i
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January 30, 1978 IE Bulletin No. 78-02 TERMINAL BLOCK QUALIFICATION Description of Circumstances:
On January 18, 1978, Connecticut Yankee Atomic Company performed a screening test intended to verify previous analyses of the environmental qualifications of unprotected terminal blocks used inside containment.
The test was performed at the Franklin Institute Research Laboratories, Philadelphia, Pennsylvania.
The test specimen was a Marathon M-6012 ter=inal block.
It was exposed to a steam environment which was designed to envelope the calculated I.0CA environmental conditions in the Haddam Neck contain=ent. The pressure selected for the test was 40 psig for a period of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
The te=perature profile consisted of a rise fro: an initial te=peratqre of 100 degrees Fahrenheit to 275 degrees Fahrenheit within ten seconds, followed by a steady state operation at 275 degrees Fahrenheit for four hours. This was followed by a drop of te=perature to 140 degrees Fahrenheit within one hour, followed by a repetition of the initial temperature rise to 275 degrees Fahrenheit (within ten seconds). The temperature then remained constant at 275 degrees Fahrenheit for the remaining 19 hours2.199074e-4 days <br />0.00528 hours <br />3.141534e-5 weeks <br />7.2295e-6 months <br /> of the test period.
During the initial screening test, 525 volts, single phase, 60 Hertz, ac voltage was applied to two pairs of terminals on the test specicen.
Inability of the terminals to hold the voltage was defined before the test as an appropriate failure criterion. The test was initiated on January 19, 1978. The terminal block functioned as intended during the first 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> of the test at which time one of the pairs of terminals failed the test.
The cause of failure is still under investigation. The failure occurred during an operator error resulting in a pressure and te=perature excursion which is outside the envelope of the intended test. Because DUPLICATE DOCUMENT Entire document previously entered into system under:
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