05000220/LER-1980-007-03, /03L-0:on 800303,while Shutdown for Maint,Attempts to Close Both Air Operated Outside Main Steam Isolation Valves Failed.Caused by Rust Buildup in Pilot Shuttle.New Instrument Air Sys Is Being Installed

/03L-0:on 800303,while Shutdown for Maint,Attempts to Close Both Air Operated Outside Main Steam Isolation Valves Failed.Caused by Rust Buildup in Pilot Shuttle.New Instrument Air Sys Is Being Installed

ML18037A243
Person / Time
Site:	Nine Mile Point
Issue date:	03/20/1980
From:	NIAGARA MOHAWK POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML17053B514	List: 05000220/LER-1980-007, Forwards LER 80-007/03L-0 05000220/LER-1980-007-03, /03L-0:on 800303,while Shutdown for Maint,Attempts to Close Both Air Operated Outside Main Steam Isolation Valves Failed.Caused by Rust Buildup in Pilot Shuttle.New Instrument Air Sys Is Being Installed ML17053B513 ML18037A243
References
LER-80-007-03L, LER-80-7-3L, NUDOCS 8003310281
Download: ML18037A243 (4)

LER-1980-007, /03L-0:on 800303,while Shutdown for Maint,Attempts to Close Both Air Operated Outside Main Steam Isolation Valves Failed.Caused by Rust Buildup in Pilot Shuttle.New Instrument Air Sys Is Being Installed

Event date:
Report date:
2201980007R03 - NRC Website

text

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Disassembly of the ilot valves revealed that rust buildu had occurred in the ilot shuttle.

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EVENT DESCRIPTION AND PROBABLY CONSEQUENCES While shut down for maintenance, attempts to close both air operated out-side main steam isolation valves failed.

Technicians disconnected the bleed off line to the air operator of one MSIV and jarred the pilot shuttle valve.

At this time the MSIV closed.

Without any changes, a second attempt was made to close the other MSIV.

The attempt succeeded.

Subsequent testing revealed that both valves opened and closed properly.

The event occurred with the reactor mode switch in "refuel" at zero power.

As a result, the consequences were insignificant.

EVENT DESCRIPTION AND PROBABLY CONSEQUENCES While shut down for maintenance, attempts to close both air operated out-side main steam isolation v'alves failed.

Technicians disconnected the bleed off line to the air operator of one MSIV and jarred the pilot shuttle valve.

At this time the MSIV closed.

Without any changes, a second attempt was made to close the other MSIV.

The attempt succeeded.

Subsequent testing revealed that both valves opened and closed properly.

The event occurred

with the reactor mode switch in "refuel" at zero power.

As a result, the consequences were insignificant.