05000324/LER-1981-031-03, /03L-0:on 810223,instrumentation Isolation Valve F014J,located at RIP X-56B,closed,isolating Reactor Protection Sys Main Steam Line High Flow Instruments 2-B21-dPIS-N008A & N008B.Caused by Ruptured Bourdon Tube

/03L-0:on 810223,instrumentation Isolation Valve F014J,located at RIP X-56B,closed,isolating Reactor Protection Sys Main Steam Line High Flow Instruments 2-B21-dPIS-N008A & N008B.Caused by Ruptured Bourdon Tube

ML19350C704
Person / Time
Site:	Brunswick
Issue date:	03/24/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19350C702	List: 05000324/LER-1981-031-03, /03L-0:on 810223,instrumentation Isolation Valve F014J,located at RIP X-56B,closed,isolating Reactor Protection Sys Main Steam Line High Flow Instruments 2-B21-dPIS-N008A & N008B.Caused by Ruptured Bourdon Tube
References
LER-81-031-03L, LER-81-31-3L, NUDOCS 8104060623
Download: ML19350C704 (2)

LER-1981-031, /03L-0:on 810223,instrumentation Isolation Valve F014J,located at RIP X-56B,closed,isolating Reactor Protection Sys Main Steam Line High Flow Instruments 2-B21-dPIS-N008A & N008B.Caused by Ruptured Bourdon Tube

Event date:
Report date:
3241981031R03 - NRC Website

text

U.S. NUCLEAR REGULATORY COMMISSION CRC FORM 366 f7/7)

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8 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lDuring normal plant operation, instrumentation isolation valve F014J, located at l

o 2 g l RIP X-56B, closed, isolating RPS main steam line high flow instruments 2-321-dPIS-l l N008A and 5008B. These instruments function.to isolate MSIV's, main steam line drain l o 4 Both l

l valves and RWCU sample line isolation valves on main steam line high flow.

o s l o j6 ) l instruments were declared inoperable and aCCions were taken in aCCordance with l

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34 35 3o al 40 41 42 43 44 47 JJ CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 2-C32-PT-N009C, Model Q lThe bourdon tube in the parallel feedwater control instrument, y l No. 551, ruptured, causing an auto isolation of the F014J valve due to a detected high, The N009C instrument was isolated locally and the F014J valve was reopened to g l flow.

The N009C instrument will be j

g l return the N008A and N008B instruments to operation.

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. r0 NAME OF PREPARER PHONE-

- 810.4060(o23

LER ATTACHMENT RO #2-81-31 Facility: BSEP Unit No. 2 Event Date: 2-23-81 This event occurred when the bourdon tube in the feedwater control system pressure transmitter 2-C32-PT-N00PC ruptured and caused the auto closing of the

. F014J instrumentation isolation valve due to a detected line break.

An examination of the bourdon tube revealed that a hairline crack had developed in

.t e tu e, pro ab bly due to fatigue of the tube material encountered in normal h

b operation.

A review of past operating and maintenance records for the approximate 200 of these type instruments in service on both units revealed this failure was the first occurrence involving an instrument bourdon tube. Based on i

this review, this event has been determined to be isolated with no further action required.

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