05000285/LER-1979-008-03, /03L-0 on 790321:during Normal Operation,Loop Safety Injection Valve Failed to Open from Lockout Relay Activation.Caused by Dirty Auxiliary Interlock Switch. Switch Cleaned

/03L-0 on 790321:during Normal Operation,Loop Safety Injection Valve Failed to Open from Lockout Relay Activation.Caused by Dirty Auxiliary Interlock Switch. Switch Cleaned

ML19263E023
Person / Time
Site:	Fort Calhoun
Issue date:	03/22/1979
From:	Connolly J OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19263E021	List: 05000285/LER-1979-008, Forwards LER 79-008/03L-0 05000285/LER-1979-008-03, /03L-0 on 790321:during Normal Operation,Loop Safety Injection Valve Failed to Open from Lockout Relay Activation.Caused by Dirty Auxiliary Interlock Switch. Switch Cleaned
References
LER-79-008-03L, LER-79-8-3L, NUDOCS 7904240360
Download: ML19263E023 (3)

LER-1979-008, /03L-0 on 790321:during Normal Operation,Loop Safety Injection Valve Failed to Open from Lockout Relay Activation.Caused by Dirty Auxiliary Interlock Switch. Switch Cleaned

Event date:
Report date:
2851979008R03 - NRC Website

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LICENSEE EVENT REPORT CONTROL BLOCK !

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REPORT D ATE iJ EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l Curind normal power operation vnile performng.ST-SF-2, Loop 3arety in.'eccion tal te 1

o[2 lHC7-311 failed to open frc= lockcut relay actuation.

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LER 79-008 Onaha Public Power District Fort Calhoun Station Unit No. 1 Docket No. 05000235 Attachment No. 1

Safety Analysis

The Engineered Safeguards System is so designed that no single failure can jeopardize the safe shutdown of the plant if required.

The safeguards system at Fort Calhoun Station is separated into two trains of systems either of which would provide adequate accident protection.

The railure of a single high pressure loop valve does not degrade any of the safety analyses performed on Fort Calhoun Station No. 1.

During the time HC7-311 was inoperable, the remaining loop safety in-j ection valves were considered operable and available to perform their design function.

Since the last failure of this tr.;e, ( April 1976), the surveillance tests associated with the operational testing of all Safety Injection valves have been revised to electrically verify the operability of these valves.

The failure to verify operability of HCV-311 was a result of operating HC7-311 to correct level in a safety injection tank during back shift hours.

This problem vill be resolved by verification of valve operability following each valve operation in accordance with the revised operating instruction.

It should be noted that during the 1978 Refueling Outage, the problems described in IE Bulletin 78-05 of this type of Aux. Interlock switch binding was resolved by removing and installing new plunger arms and overicad relay insulation.

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LE3 79-008 Cmaha Public Power District Fort Calhoun Station Unit :Io. 1 Docket !lo. 05000285 Attachment ?io. 2 Failure Data This is the fourth failure of an auxiliary interlock switch on a safety injection valve, due to binding.

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