ML19254F926

RO-NP-09-79-06:on 791008,station Vent Recorder UJR5023 Was Inoperable.Caused by Recorder Not Advancing Paper Under Printer Due to Drive Shaft & Gear Mechanism Jam.All Ujr Recorders Will Be Replaced

ML19254F926
Person / Time
Site:	Davis Besse
Issue date:	11/02/1979
From:	TOLEDO EDISON CO.
To:
Shared Package
ML19254F925	List: ML19254F924 ML19254F926
References
NUDOCS 7911190461
Download: ML19254F926 (1)

Text

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Docket No. 50-346 License No. NPF-3 TOLEDO EDISON COMPANY DAVIS-BESSE NUCLEAR POWER STATION UNIT ONE REPORTABLE OCCURRENCE NP-09-79-06 -

DATE OF EVENT: October 8, 1979 FACILITY: Davis-Besse Unit 1

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IDENTIFICATION OF OCCURRENCE: Station Vent Recorder UJR5023 inoperable

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Conditions Prior to Occurrence: The unit was in Mode 1, with Power (MUT) = 1830, and Laad (Gross MWE) = 600.

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Description of Occurrence: On October 8,1979, the Chemistry and Health Physics supervisor found that station vent recorder UJR5023 was inoperable. The strip paper was not advancing under the printer. This put the unit in violation of Environmental Technical Specification (ETS) 2.4.4.b which requires a continuous monitoring of air-borne activity in the station vent releases and a continuous monitoring and recording of station vent flow. Operations personnel began taking hourly readings and recorded station vent airborne activity. Station vent flow was being recorded on the daily log by computer point F885.

Designation of Accarent Cause of Occurrence: The recorder was not advancing paper under the printer because the drive shaf t and gear mechanism were jammed. The shaft o

was quite chewed up. These shaf ts have been previously replaced but have not held up. This is a co= mon problem with the recorders.

Analysis of Occurrence: There was no danger to the health and safety of the public or station personnel. The local monitors from the areas that exhaust into the station vent were operable and would have alarmed on high radiation levels. Station vent flow was obtainable from computer point F885.

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Corrective Action: Under Maintenance Work Order IC-258-79, the recorder was removed from service and inspected. The damaged drive shaf t was replaced, and the paper feed mechanism tested for operability. The recorder was returned to service at 1210 hours0.014 days <br />0.336 hours <br />0.002 weeks <br />4.60405e-4 months <br /> on September 9, 1979. Facility Change Request 79-217 was written to replace all UJR recorders with newer design instruments, and the station is currently awaiting the arrival of the replacement units.

Failure Data: UJR5023 was reported inoperable in Reportable Occurrence NP-09-79-05 1343 359 7911100 hb(