05000029/LER-1977-009, Forwards LER 77-009/03L-0

Forwards LER 77-009/03L-0

ML19345A352
Person / Time
Site:	Yankee Rowe
Issue date:	03/23/1977
From:	Autio H YANKEE ATOMIC ELECTRIC CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345A353	List: 05000029/LER-1977-009, Forwards LER 77-009/03L-0 05000029/LER-1977-009-03, /03L-0:on 770221,primary Vent Stack Monitor Particulate Channel Alarmed Due to Blown Fuse.Caused by Ledex Stepping Motor Failing to Advance Filter Paper Which Overloaded Driving Transistor.New Motor & Fuse Installed
References
NUDOCS 8011190274
Download: ML19345A352 (1)

LER-1977-009, Forwards LER 77-009/03L-0

Event date:
Report date:
0291977009R00 - NRC Website

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YANKEE ATOMIC ELECTRIC COMPANY gg

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Rowe, Massachusetts 01367 IANKEE b

March 23, 1977 4

L, Mr. J. P. O'Reilly, Director I

U.S. Nuclear Regulatory Commission I

Office of Inspection and Enforcement Region I 631 Park Avenue King'of Prussia, Pennsylvania 19406 Subj(ct: Reportable Occurrence 50-29/77-09/03L Primary Vent Stack Radiation Monitoring i

Particulate Channel Filter Paper Drive l

Motor Failure

Dear Mr. O'Reilly:

In accordance with Technical Specifications, Section 6.9.4.b, the attached Licensee Event Report is hereby submitted.

Very truly yours, f

Herbert A. Autio Plant Superintendent rib /mid

Enclosure:

cc:

[30] Director, Office of Inspection and Enforcement U.S. Nuclear Regulaton Comission Washington, D.C. 20555 [3]

Director, Office of Management Information S Program Control U.S. Nuclear Regulato n Co M ssion Washington, D.C. 20555 780=200?8 l

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LER 77-09/03L EVENT D3SCRIPTION

- During nomal operation the Primary Vent Stack (PVS) Monitor Particulate Channel alamed. Tne investigation of the alarm

- disclosed that a fuse was blown on the Particulate Channel.

The inst unent was declared inoperative. This instrument is required to be operable per Technical Specification, Section 3.3.3.1.

No releases were in progress at the time of the failure and all planned releases were cancelled. A grab '3 ample was analyzed, results satisfactory.

The paper drive motor was replaced and the channel was returned to operatiot. A channel functional test was performed. The results were satisfactory and the channel was declared operable.

This event is non-repetitive.

(77-09/03L)

CAUSE DESCRIPTION An Ledex stepping motor, Series SQ, No. 216090-026 faile/ to advance the filter paper. The failure of the filter paper advance motor resulted in the overload of the driving transister. 'Ihis in turn caused a blown fuse on the Particulate Channel filter paper drive system. A new motor and fuse were installed.

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