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) | |
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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.
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
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l Other (specify)
Defuele~d s-s 7.
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.
ps E.
Reactor Building cooling fan, VSF-1B failed to start on an E.S.
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' signal.
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!!eportab!c Occurrence I:cport. No.
50-313/76-9 4
'8.
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)
X fi See attachment.
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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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