ML20042A643

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Forwards Updated LER 81-033/01X-1.Detailed Event Analysis Encl
ML20042A643
Person / Time
Site: Dresden Constellation icon.png
Issue date: 02/25/1982
From: Scott D
COMMONWEALTH EDISON CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20042A644 List:
References
82-267, NUDOCS 8203230644
Download: ML20042A643 (2)


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  • 7^C-N Commonwealth

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Dresden Nucle:r Power St tionEdison c-m R_R. #1 Morris, Illinois 80450

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Telephone 815/942 2920 February 25, 1982 DJS Ltr. #82-267 Q by S

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James 0. Keppler, Regional Administrator 9I

  • 2.31982a-Directorate of Regulatory Operations - Region III M G 7't ??M,r;c:::

U.S. Nuclear Regulatory Commission nS' ' "' ' if" 82 ., #'

3 i 799 Roosevelt Road Clen Ellyn, IL 60137 y~ h' Revised Reportabic Occurrence Report #81-33/01X-1. Docket 050-237 is being submitted to your office in accordance with Dresden Nuclear Power Station Technical Specification 6.6.B.1.(e), failure or malfunction of one or more components which prevents or could prevent, by itself, and the fulfillment of the functional requirements of system (s) used to cope with accidents analyzed 'a the CAR. This supplemental report is being submitted to update the cause desci Vtion.

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' ' csd D. J. Scott Station Superintendent Dresden Nuclear Power Station DJS:nh Enclosure I cc: Director of Inspection & Enforcement Director of Management Information & Program Control U.S. NRC, Document Mr genent Branch j

File /NRC

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8203230644 820225 //

gDRADOCK 050002S MAR 15 &

ATTACHMENT TO LICENSEE EVENT REPORT 81-33/OlX-1 COMMONWEALTH EDISON COMPANY (CWE)

DRESDEN UNIT #2 DOCKET # 050-237 While blowing down HPCI steam supply line, with HPCI on the , turning

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, gear, the auxiliary oil pump tripped and the motor was found to be burned.

HPCI was declared inoperable and the required surveillances were begun.

This event was of minimal safety significance since all remaining ECCS-systems were available. This is the first occurrence of this type. HPCI system control circuits related to the operation of this pomp were tested with no abnormalities noted.

The apparent cause of the failure was a stator winding becoming loose and moving out of its slot. This allowed the winding to rub against the rotor causing failure of its insulation and allowing subsequent arcing and motor failure. The motor was repaired and will continue to be checked during normal surveillance testing.

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