05000324/LER-1981-006-03, Valve Stem Disk Separation Occurred in Valve F02BC.Caused by Failure to Install disk-to-piston Assembly Locking Pin.Cylindrical Style Locking Pin Installed in Assembly

Valve Stem Disk Separation Occurred in Valve F02BC.Caused by Failure to Install disk-to-piston Assembly Locking Pin.Cylindrical Style Locking Pin Installed in Assembly

ML20010J047
Person / Time
Site:	Brunswick
Issue date:	09/18/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010J030	List:
References
LER-81-006-03L, LER-81-6-3L, NUDOCS 8109290543
Download: ML20010J047 (1)

LER-1981-006, Valve Stem Disk Separation Occurred in Valve F02BC.Caused by Failure to Install disk-to-piston Assembly Locking Pin.Cylindrical Style Locking Pin Installed in Assembly

Event date:
Report date:
3241981006R03 - NRC Website

text

NRC FORM 366 U. S. NUCLE AR REGULATORY COMMISSION 87 7Fg LICENSEE EVENT REPORT Update Report Previous Report Date 2-5-81 CONTROL BLOCK: l l

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60 61 DOCKTT NUMSER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSCOUENCES h lDurine the performance of Main Steam Line Isolation Valve Closure Channel Functional l

O 2 l O l a l l Test, PT 1.3.1P-2, when MSiV 2-B21-F028C was given an open command signal, the flow l

[T[Tl l indication in main steam line C remained at zerC..

It was then determined that a valve l lOlsj ?etem disk separation had occurred in F028C. Both MSlVs in the steam line were closed l Lo_1.s_) I and deactivated.

This event did not af fect the health and safety of the public.

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l0l7l l additional information see LER 2-81-60.

J s l Technical Specifications 3.6.3, 6.9.1.9b l

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h W lAn inspection of the valve internals showed no evidence that the valve main disk-to-piq-Iton assembly locking pin had been installed, thereby allowing the main disk to unscrewl i i lfrom the piston-and fall into the valve seat at the time of the event. The valve was l i 7

@ l repaired by installing a cylindrical style locking pin in the valve main disk-to-pistoq l assembly and two cylindrical style locking pins in the valve stem-to-stem disk assembly.

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M. J. Pastva. Jr*

PHONE:

N AME OF PREPARER