ML19305D796

LER 80-005/03L-0:on 800311,while Performing SI-247.605, Reactor Solid State Protection Sys Was Placed in Input Inhibit Mode,Removing High Voltage from Source Range Channel N31.Caused by Removal of Fuses from Voltage Cut Out Relay

ML19305D796
Person / Time
Site:	Sequoyah
Issue date:	04/08/1980
From:	Mcgriff J TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19305D793	List: ML19305D792 ML19305D796
References
LER-80-005-03L-02, LER-80-5-3L-2, NUDOCS 8004150533
Download: ML19305D796 (2)

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g, , , , i the reactor solid state _ protection _ system was placed in the " input J

g i nhibit", i mode. This removed the high voltage from the source range 1 g i channel N31. Action statement LCo 3.9.2 was initiated b cAu.se 1 of _Qnly_J I

gi having one sou.rce range channel in service. Unit was in Mode 6 but no,.f

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g ,of a source range voltage cut out relay. Fuses L19 and L20_had been g iremoved which prevented operation of this relay. The fuses were I

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Tennessee Valley Authority Sequoyah Nuclear Plant LER SUPPLEMENTAL INFORMATION SQRO-50-327/8005 Technical Specification Involved 3.9.2 Reported Undar Technical Specification 6.9.1.13.b Date of Occurrence: 3/11/80 Time of Occurrence: 1220 CST Unit 1 Identification and Description of Occurrence:

Alarm for loss of detector voltage of NIS System actuated noting that source range channel N31 was not operable.

Conditions Prior to Occurrence:

Unit I was in Mode 6 but core alterations were not in progress.

Action specified in the Technical Specification Surveillance Requirements met due to inoperable equipment. Describe.

Confirmed that core alterations were not in progress and restored the channel to service. ,

Apparent Cause of Occurrence:

Fuses L19 and L20 source range voltage cut out relay had been removed thus causing it to be in the cut out state. When the reactor solid state protec-tion system was placed in the " input inhibit" mode for surveillance testing voltage was lost to the detector.

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Analysis of Occurrence:

There was no hazard to plant equipment or personnel health or safety. '

Corrective Action:

Replaced the fuses.

i Failure Data:

N/A

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