ML19326C036

RO 50-313/76-09:on 760512,four Valves & Reactor Bldg Cooling Fan Failed to Respond to Simulated Engineered Safeguards Signal.Caused by Friction Due to Stem & Packing Aging,Dirty Relay Contacts & Loose Terminal Plug Connection

ML19326C036
Person / Time
Site:	Arkansas Nuclear
Issue date:	06/09/1976
From:	David Williams ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19326C031	List: ML19326C030 ML19326C036
References
NUDOCS 8004180717
Download: ML19326C036 (5)

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Repor:abic ' Occurrence Report 13i.

50-313/76-9.

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Report Date: June.9, 1976 3.

Occurrence Daf,e: !!ay 12,1976 t.

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Arkansas Nuclear One-Unit 1 Russellville, Arkansas 5.

Identification of Occurrenec:

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~ Failure'to respond to simulated E.S. signal during refueling period testing.

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Conditions Prior to Ocenrrence:

Steady-State Power Reactor Power n

t!Wth llot Standby Net Output 0

FfWe Cold Shutdown Percent of 1ull Power o

's Refueling Shutdown X

Load Changes During Roi: tine Power Operation Routine Startup f.

Operation Routine Shutdown Operation

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l Other (specify)

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Description of Occurrence:

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The following equipment failed -to respond properly to a simulated E.S.

signal during the refueling period test:

A.

!!ake up pump recirculation valve, CV-1300, which received an E.S.

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signal.but the valve torqued out and did not close.

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Auxiliary cooling water valve, CV-3643, which received an E.S.

l-signal but the valve torqued out and did not closc.

C.

Service water to the Reactor Building, CV-3814. failed to respond to an E.S. signal and open.

.D.

_ Reactor Building particulate monitor isolation valve, CV-7454, failed to respond to an E.S. signal and close.

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Reactor Building cooling fan, VSF-1B failed to start on an E.S.

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!! arch 23, ' 1976 N5,P-10 Rev. 4 Page' 2 of 4 i

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!!eportab!c Occurrence I:cport. No.

50-313/76-9 4

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Desij: nation of Apparent Cause of Occurrence:

i Desinn l'rocedurc Manufacture Unusual Service Condition i;

Including Environmental-

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Installation /

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I-Construction Component Failure X

Ope rator Other (speci fy)

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Analysis of Occurrence:

l-The redundant component for CV-1300, CV-3643, CV-3814, CV-7454 and VSF-1B

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and VSF-1B were also operable manually from the control room. Due to the i f redundant components responding properly there was no hazard to the health and safety of the public.

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Reportable Occurrence !!cpprt ilo. 50-313/76-f d

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Corrective Action:

Adjustments were made.to' the torque switches for CV-1300 and CV-3643 relay was cleaned that caused CV-3814 failure to respond.

The loose connection at the terminal plug for CV-74S4 was tightened. The hand switch, ilS-7411, ' for VSF-1B was replaced. All components were retested i

j by simulating an E.$. signal and responded properly.

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Failure Data:

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llandswitch !!S-7411 is a GE Type CR2940 spring return to neutral.

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l CV-1300 is a 2" Bolted Bonnet Gate Valve 1500# Velan Fig. No. N8-354B-13MS i

CV-3643 is an 18" 150# 9123 Double R/L Fisher Controls Butterfly Valve ES relay for CV-3814 is GE catalog No. 12HGA11J52 i

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March 23,1976 NSP-10, Rev.

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Attachment to Reportable Occurrenco~No. 50-313/76-9 1

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Other A.

The apparent cause for.CV-1300 and CV-3643 torquing out was increased j'

friction between the valve stem and packing due to aging.

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CV-3814 did not respond due to a dirty relay contact.

B.

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CV-7454 did not respond due to a loose connection'at a terminal plug.

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D.

VSF-1B did not respond due to contact failure in the fan handswitch (IIS-7411).

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