ML20235R121
| ML20235R121 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 09/29/1987 |
| From: | Kulchak R MORRISON-KNUDSEN ENGINEERS, INC. |
| To: | Taylor J NRC |
| References | |
| REF-PT21-87, REF-PT21-87-164-000 PT21-87-164, PT21-87-164-000, NUDOCS 8710070798 | |
| Download: ML20235R121 (2) | |
Text
_-__--_-7
- CONTRACTORS
- n ENGINEERS '
']
DEVELOPERS MORRISO -KNUDSEN COMPANY,INC.
===.
'ed3*R"?!aC?M" l.
L September 29, 1987 Mr. James Taylor USNRC
- 1717 H ' Street Washington, D.C.
20555
Subject:
Reportable 10CFR21 Finding,. Saturable Core Transformer Installed in Emergency Diesel Generator Set
Dear Sir:
We' have been advised by our manufacturer, Power Systems Divisions, of - a potential ' problem with the above subject' transformer installed at the Sequoyah-Nuclear Plant-which is in nuclear service (correspondence attached).
Our Power Systems Division in Rocky Mount, North Carolina has been notified by the utility (TVA) of this problem and they are proceeding to report.it as a 10CFR21 defect.
As you will note from the attached correspondence, the problem developed in service 'and a tear down inspection was performed by the utility.
The.
results were noted as not adequate insulation between windings.
We will forward additionc1 information.as it becomes available.
Very truly!yo s,
J/
/
a-R. D.
Mca Director' Quality Assu ance RDK/gs Attach.
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H. Falter V. Mitchell F11E 8
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JiFTN RON KULCHAK
,5 GPT. 25, 1987
[3FERENCE SEGUOYAH - TVA 10CFR21
'(
THE EME RGENCY DIESEL GENERATOR FURNISHED TO THE SEQUOYAH o
NUCLEAR PLANT (TVR)'USED A SATURABLE CORE TRANSFORMER l
4 MANUFACTURED BY BAGLER ELECTRIC IN HIGHLAND, ILLINOIS.
ONE SATURABLE CORE:. TRANSFORMER FAILED IN SERVICE.
THE f
PART' NUMBER IS BEIR173-001.
IT HAS BEEN REPL/4CED WITH A CABLER PART NUMBER $Ee2873-001.
TVA DISECTED THE FAILED TRANSFORMf!R AND CONCLUDED THAT a
i THERE WAS NOT ADEQUATE INSULATION BETWEEN THE WINDINGS.
THIS'IS PROBABLY A WORKMANSHIP PROBLEM.
I HAVE NCT7' SEEN ANY OF THE EVIDENCE.
TVA CALLED TO REPORT THEIR CONCLUSION THAT THIS WAS A o
REPORTABLE DEFECT AND WILL REPORT IT UNDER 10CFR21.
\\>
WE SHOULD NOTIFY THE NRCiTHAT TVA WILL REPORT THIS DEFECT, o.
BECAUSE THE NRC AUDITOR ORITICIZED ME FOR NOT DOING SO PREVIOUSLY.
- 3GARDS, M/PSD ERRY FALTER EMM 4
2KAYAN BSE E eRATION 214 secs LISTED 14:42 MDT 09/25/87
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