05000249/LER-1977-001, For Dresden Unit 3 Regarding During Normal Operation, Differential Pressure Indicating Switch 3-1349A Failed in the Opening Position
ML17252A283 | |
Person / Time | |
---|---|
Site: | Dresden ![]() |
Issue date: | 02/09/1977 |
From: | Stephenson B Commonwealth Edison Co |
To: | James Keppler NRC/RGN-III |
References | |
BBS Ltr. #77-110 LER 77-001-00 | |
Download: ML17252A283 (3) | |
Similar Documents at Dresden | |
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Event date: | |
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Report date: | |
2491977001R00 - NRC Website | |
text
.,
Commonw. Edison Dresden Nucleai, ower Station R.R. #1.
Morris, Illinois 60450
.. Telephone 815/942-2920 BBS Ltr. #77-110 February 9, 1977 Mr. James G. Keppler, Regional Director Directorate of Regulatory Operations -
Regioh I I I tJ; S\\ Nuclear *Regulatory C0mmi*s-si*on 799 Rooseve.lt Road.
~VIL'J ICU [ <<'llilP Glen Ellyn, 11 i inois 60137 RlGUU\\lllR~ un\\J.i\\L O*LL \\JU Enclosed pleas*e" firid Reportable Occurrence report number 50-249/1977-1.
This ~epott i~ being_ submitted to your offic~ in accordance* with the Dresden Nuclear. Power Stat.ion Technical Specifications, Se~tion 6.6.B.,
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CATEGORY REPORT TYPE 1
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EVENT DESCRIPTION
J9Tuli Dli{ihg_rf6tfual operatjcin, d\\Jf~_rential pressure 'indicati.~g switch 3-1349A._f_a_iJ_e_d _______ d
@fa) I in the open position.
The failure.causedan.isolatib.h condenser line break a:larm.
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This. is not. a repetit.!ve I
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MANUFACTURER VIOLATlON l B I 0 rs. I 0 I
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.47 48 ffi I The event was caused by the failure of an internal _microswitch.assembly in DP-IS J
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- DISCOVERY e*lectrically. although the h
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TYPE OESc'fi1PTiON Efil w NA 7 *a* s 10 PUBLICITY [i-f?.] 'I*
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- "- tAl:JSE DESCRIPTION (Continu.ed) a.
- mechanical function of the switch was unimpaired.
The switch assembly on PP.IS 3-Jj49A was prompt}y replaced, and the i so 1 at ion condenser sys tern was
- /returned to service.
Nd further corrective action was indicated.
. 3-1349A is a~arton model *288pressure sensor, with a range,of 0 -
100 inches H10 differential press~~e.
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