05000302/LER-1978-034-03, /03L-0:on 780621,decay Heat Removal Flow Control Valve DHV-111 Failed to Respond to Open Command After Being Closed to Check for Low Pressure Injection.No Apparent Cause.Remote Control Immediately re-established

/03L-0:on 780621,decay Heat Removal Flow Control Valve DHV-111 Failed to Respond to Open Command After Being Closed to Check for Low Pressure Injection.No Apparent Cause.Remote Control Immediately re-established

ML19308D214
Person / Time
Site:	Crystal River
Issue date:	07/14/1978
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19308D151	List: 05000302/LER-1978-034, Forwards LER 78-034/03L-0 05000302/LER-1978-034-03, /03L-0:on 780621,decay Heat Removal Flow Control Valve DHV-111 Failed to Respond to Open Command After Being Closed to Check for Low Pressure Injection.No Apparent Cause.Remote Control Immediately re-established
References
LER-78-034-03L, LER-78-34-3L, NUDOCS 8002270676
Download: ML19308D214 (2)

LER-1978-034, /03L-0:on 780621,decay Heat Removal Flow Control Valve DHV-111 Failed to Respond to Open Command After Being Closed to Check for Low Pressure Injection.No Apparent Cause.Remote Control Immediately re-established

Event date:
Report date:
3021978034R03 - NRC Website

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SUPILEMENTARY INFORMATION

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( C 7 port No.:

50-302/78-034/03L-0 Q ]acility:

2.

Y Crystal River Unit #3 3.

Report Date:

14 July 1978 4

Occurrence Date:

21 June 1978 5.

Identification of occurrence:

No control of the Decay Heat Ramoval Flow control Valve DRV-lli rendering in a condition contrary to Technical Specification 3.1.2.5.

6.

Conditions Prior to Occurrence:

Mode 6 refueling.

7.

Description of Occurrence:

At 1300 with Decay Heat Removal Flow at approrimately 1000 GPM to check for low pressure injection low flow alarm, Decay Heat Removal Flow Control Valve (DEV-111) would not respond to an open consnand while in " bypass mode".

DEV-lll was manually reopened to regain required flow. Valve control was placed in Both " automatic" and " bypass" by the operators and DEV-lli responded in all cases. Maintenance electricians investigated and found no discrepancies. Valve DEV-111 was cycled several times and responded satisfactorily to commands.

T2esignation of Apparent Cause:

Cause of this event is undetermined as full control was re-established and subsequent investigation revealed no apparent cause.

9.

Analysis of Occurrence:

There were no safety implications presented by this occurrence as manual control of flow was available and utilized until remote controls responded.

10.

Corrective Action

None required as cause is a transient anomaly.

11.

Failure Data:

This is the first occurrence of this event.