ML19329A314

Proposed Bulletin, Misapplication of Crane Co 10 Inch 300 Lb Cast Alloy Steel Valve,Catalog Number 151 1/2 Lu in PWR Plants Supplied by B&W

ML19329A314
Person / Time
Site:	Oconee
Issue date:	09/03/1974
From:	US ATOMIC ENERGY COMMISSION (AEC)
To:
Shared Package
ML19329A313	List: ML19329A314
References
IEB-740903, NUDOCS 8001020889
Download: ML19329A314 (2)

Text

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- 'V MISAPPLICATION OF CRANE COMPANY 10 INCH 300 POUND CAST ALLOY STEEL VALVE - CATALOG NUMBER 151 1/2 LU.

l A recent unusual event report submitted by a licensee of a PWR plant, supplied by B&W, indicated the failure of valve internals in a valve in the low pressure injection system. This has been the third failure of this nature in a two year period, c

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Description of Circumstances f

The low pressure injection system was being operated in the decay

. heat removal mode when it was noted that flow could not be f

throttled below 4003 gpm. The system had been in operation for an extended period at flows less than 3000 gpm.

Visual inspection I

of the valve revealed that the guide pin on the base of the valve l

disc had broken off. Previous failures had been with the disc i

guide bar and the disc guide pin.

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The valve manufacturer advised the licensee that this valve was not intended for regulating service. Operation in a regulating mode causes vibration and/or cavitation and results in failure.

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Action Requested i

Please supply this office, in writing within 30 days af ter receipt C

of this bulletin, the following requested information:

1. Are similar valves used in any safeguard system in your facility?

2. Are they used as flow regulating or throttle valves?

3. If the valves-are used for flow regulation or as throttle valves, i

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4 Jl, what action have you taken_or-do you plan to take to minimize i

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the potential for failure of valve internals?

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4. 'If this bulletin does not apply to your facility, a. negative

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report is requested.

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