05000302/LER-1978-045-03, /03l-0 on 780907:closed Indication Not Received for Control Complex Air Supply Damper D-1 After Closed Command Was Issued.Caused by Mech Binding of Air Supply Damper.Preventive Maint Will Provide Corrective Action

/03l-0 on 780907:closed Indication Not Received for Control Complex Air Supply Damper D-1 After Closed Command Was Issued.Caused by Mech Binding of Air Supply Damper.Preventive Maint Will Provide Corrective Action

ML19344A050
Person / Time
Site:	Crystal River
Issue date:	09/27/1978
From:	Cooper J FLORIDA POWER CORP.
To:
Shared Package
ML19344A049	List: 05000302/LER-1978-045, Forwards LER 78-045/03l-0 05000302/LER-1978-045-03, /03l-0 on 780907:closed Indication Not Received for Control Complex Air Supply Damper D-1 After Closed Command Was Issued.Caused by Mech Binding of Air Supply Damper.Preventive Maint Will Provide Corrective Action
References
LER-78-045-03L, LER-78-45-3L, NUDOCS 7810110152
Download: ML19344A050 (2)

LER-1978-045, /03l-0 on 780907:closed Indication Not Received for Control Complex Air Supply Damper D-1 After Closed Command Was Issued.Caused by Mech Binding of Air Supply Damper.Preventive Maint Will Provide Corrective Action

Event date:
Report date:
3021978045R03 - NRC Website

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PTICN ANo PaotAatt con 51oGENCEt h aVENTOt$Ca At 1600, during the performance of SP-417. Refueline Tnegrv,1 Tne gr,r,a l

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SUPPLEMENTARY INFORMATION 1.

Report No.:

50-302/78-045/03L-0 2.

Facility:

Crystal River Unit #3 3.

Report Date:

27 September 1978 4.

Occurrence Date:

7 September 1978 5.

Identification of Occurrence:

Failure to have two operable Control Room emergency ventilation systems which is contrary to Technical Specification 3.7.7.1.

6.

Conditions Prior to Occurrence:

Mode 4 hot shutdown.

7.

Description of Occurrence:

At 1600, during the performance of Surveillance Procedure, SP-417, Refueling Interval Integrated Plant Response to Engineered Safeguards Actuation, it was discovered that the Control Complex air supply damper D-1, did not respond to a close command. This was substantiated by observing that a closed position indication had not been received in the Control Room. Operability was restored on 8 September 1978, after a successful post maintenance test.

8.

Designation of Apparent Cause:

This occurrence was caused by the mechanical binding of the air supply damper, D-1, which prohibited it from closing and making contact with closed limit switch.

9.

Analysis of Occurrence:

The health and safety of plant and public was not endangered as no accident conditions existed at the time of this occurrence.

10.

Corrective Action

Preventive maintenance will identify the requirement for frequent lubrication as corrective action.

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Failure Data:

l No previous occurrence of this event.

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