ML19261A610

LER 79-002/03L-0 on 790102:33 Ft Wind Direction Monitor Was Inoperable.Caused by Wind Direction Sensor Bearing Being Contaminated W/Coal Dust.Sensor Renewed Thru Normal Maint

ML19261A610
Person / Time
Site:	Crystal River
Issue date:	01/25/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19261A609	List: ML19261A608 ML19261A610
References
LER-79-002-03L, LER-79-2-3L, NUDOCS 7902050115
Download: ML19261A610 (2)

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[3i: ; At 0955, during routine plant operation, it was observed that the 33' wind,

, , , firectionmonitorwasinoperable. This condition is contrary to Technical

, , , ppecification3.3.3.4 Maintenance revealed that the wind direction sensor ,

malfunctioned. Operability was restored on 8 January 1979. No redundant o's b4,a ai-nce4ne yn,cnr cnv 17' i n, n1 - Mn 5,-,va *n ekn kn,1*h ,Tu e,fnev I

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o3, phile the system was inoperable. Two previous occurrences of an event of  ;

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CAUSE DESCpirticN A 13 CC AR EC rl% E ACTIONS

, , ;The cause of this event can be attributed to a wind direction sensor beariqg

, ,being contaminated with coal dust. No corrective action necessary as the ,

, sensor was renewed through ncemal maintenance. A Modification Approval ,

Record (MAR) issued to install new type bearings and ice shields to elimin-

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SUPPLDENTARY INFORMATION Report No.: 50-302/79-002/03L-0 Facility. Crystal River Unit #?

Report Date: 25 January 1979 Occurrence Date: 2 January 1979 IdeTtification of Occurrence:

Thirty-three foot wind direction monitor inoperable contrary to Technical Specification 3.3.3.4.

Conditions Prior to Occurrence:

Mode 1 power operation (92%)

Description of Occurrence:

At 0955, during routine plant operation, it was observed that oue thirty-three foot wind direction monitor was inoperable. Investigation by maintenance personnel revealed that the directional sensor had malfu:.ctioned.

The directional sensor was renewed and operability was restored on 8 January 1979.

Design ition of Apparent Cause:

The cause of this event can be attributed to a wind direction sensor bearing being contaminated with coal dust from the surrounding coal yard.

Analysis of Occurrence:

There was no hazard to the health and safety of the plant or general public as no unplanned gaseous releases to the atmosphere occurred during this time frame.

Corrective Action:

No corrective action necessary as the wind direction sensor was renewed through normal maintenance. A Modification Approval Record (MAR) has been issued to install ice shields and new type bearings in an effort to eliminate coal dust contamination.

Failure Data:

Two previous occurrences of an event of this type reported.

/rc