ML19326C036
| ML19326C036 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 06/09/1976 |
| From: | David Williams ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19326C031 | List: |
| References | |
| NUDOCS 8004180717 | |
| Download: ML19326C036 (5) | |
Text
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- 1. Repor:abic ' Occurrence Report 13i. 50-313/76-9.
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~f' 2. Report Date: June .9, 1976 3. Occurrence Daf,e: !!ay 12,1976
- 5. Identification of Occurrenec:
{. ~ Failure'to respond to simulated E.S. signal during refueling period testing.
- 6. 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
'A d
l Other (specify) Defuele~d s-s
- 7. Description of Occurrence: )
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. -l j signal .but the valve torqued out and did not close. -!
i; ' B. 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.
, .' ps E.
Reactor Building cooling fan, VSF-1B failed to start on an E.S.
t.
) signal. .
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Attachuent "C"
-' !! arch 23, ' 1976 Page' 2 of 4 N5,P- 10 Rev. 4 i
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!!eportab!c Occurrence I:cport . No. 50-313/76-9
'8. Desij: nation of Apparent Cause of Occurrence:
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l'rocedurc . . - . .
Manufacture Unusual Service Condition i; Including Environmental-
- ) Installation / y
- I- Construction Component Failure X Ope rator Other (speci fy) X fi See attachment.
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{I} ," 9. Analysis of Occurrence: -
- l-The redundant component for CV-1300, CV-3643, CV-3814, CV-7454 and VSF-1B
,j was operabic and did respond properly to an E.S. signal. CV-3814, CV-7454 i+ and VSF-1B were also operable manually from the control room. Due to the if redundant components responding properly there was no hazard to the health
. and safety of the public. ,
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At t acionent "C" th rch 23, ' 1976 f4SP- 10, Rev. 1 Page 3Of4 1
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-l \ Reportable Occurrence !!cpprt ilo. 50-313/76-f d
- 10. 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 i ,
' switch, ilS-7411, ' for VSF-1B was replaced. All components were retested j by simulating an E.$. signal and responded properly.
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, j II. Failure Data:
I
[- llandswitch !!S-7411 is a GE Type CR2940 spring return to neutral. ~
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 l
! ES relay for CV-3814 is GE catalog No. 12HGA11J52 i
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March 23,1976 NSP-10, Rev. 4- Page 4 of 4
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Attachment to Reportable Occurrenco~No. 50-313/76-9 1
- 8. 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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B. CV-3814 did not respond due to a dirty relay contact.
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[ jg- C. CV-7454 did not respond due to a loose connection'at a terminal
-a plug. ,
l! D. VSF-1B did not respond due to contact failure in the fan handswitch (IIS-7411) .
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