ML20148T134
| ML20148T134 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 05/22/1974 |
| From: | Rone A JERSEY CENTRAL POWER & LIGHT CO. |
| To: | |
| References | |
| AO-50-219-74-32, NUDOCS 8102190757 | |
| Download: ML20148T134 (3) | |
Text
,
pate er -
'Intesat setepnene!
Occurrenes 5/21/74
. Report. Dater
'5/?$/74-(-
Time of l
Initial tfritten Report Date::
5 /22 / 74 _ _ _ _ _
,0ccurrence:
1100 3
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' OYSTER CREEK NUCLEAR GENERATING STATICS FORKED RIVER, NEW JERSEY 08731-THIS DOCUMENT CONTICN3' b*'"*****""
P00R QUALITY FAGES Report No. 50-219/74/ 32
'!DENTIFICATION.
Violation.of the Technical Specifications, paragraph' N/A
'0F OCCURRENCE:
..It was observed that the RV400 core spray booster purp pressure
^
' switch failed in the pernissive position. This created a condi-
.. tion whereby had core spray booster pump NZO3B failed to start (or failed to establish a discharge pressure of 230 psig its associated redundant teoster purp, NZO3D, would not have ~ started
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,. ?, n L sutoustically.
"'.1his event is considered to be an' abnormal occurrence as de-
'.. fined in the Technical Specifications, paragraph 1.150
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CO'iDITIONS PRIOR
,'o-TO OCCURRENCE:
fSteady State Power u.' Routine Shutdown Operation
. Hot Standby Cold Shutdown
.Icad Chcages During
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X' Refueling Shutdown ^
~. Routine Power Operation
. vi.;jI Routine Startup Other (Specify) f Operation t.c
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. ' Reactor rode skitchLin REFUEL, with the reactor cavity flooded.
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.,t DESCRIPTION
. Bile perforcing the annual st'rycillance test of the auto-0F OCCURRE?iCB:
depressurization initiation logic with the System I core spray
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system disabled, it was observed that 'a relay,1K114D in the
'.' Systen'II core spray booster pu p initiation logic, was in the
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.,..! energized position.. An investigation indicated that the System II
' core spray booster pu:p discharge pressure switch, RV40D, which sctuates.this relay was in the closed position. The switch XYoN907537
uvs,waa t,y 's.avaual wuen, e,nv vvw wa yu y,wusuagu y4wneuau n.v av a "upf.t] tt 1 cast 230 'psig, khereby enr izing ths IK114D relay.
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'Normally closed contacts from the 1K114D relay act in conjunction.
- with the IK114B rel,ay and RV40B pressure switch to trip the NZ033 booster pump and start the. redundant NZO3D booster. pu=p if the pucp does not.co
- :e up to.230 psig after five seconds.
Failuie of the switch in the closed position created a condition whereby(NZ03D would not have tripped if it falled to sta
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' establish'suffici'ent' dischari;e pressure and pu=p N203D would not i
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'"1, have started since the ' logic was fai' led'in the " satisfied" I:..'
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'. It should b'e noted:that this ' failure ocentred subsequent to the
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i 4.Apri1Q.., 2 pia'nt sh'utd'own,since auxiliary contacts" fro:n 'this relay
' \\,. ['ac' uate an alarm in 'tho ' station control room which was not ob-T
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aj served during po,:or operation.
h' hen the plant is in the cold
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,shutdoUn' conditien, this alarm is norcally on because it is a
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' con =on alarm for the 285 psig permissive Awitch, R$17; for. the T
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core spray para 11ol' injection valves. Since the reactor.was y
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. fully depressurized,. this switch:was. closed and..tho: alarm was on.
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. APPAPIffT CAUSB
_ Design Procedure OP OCCUPHSCE:
Manufacturc tinusual Service Condition
~.. Cons t ru ction
^.Inc.. Environ: cntal Installation /
..j "
_ Corponent Failure 4
Operator' Other (Specify) 1 4
'Ihe cause of.this occurrence is presently under investigation.
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ANALYSIS OF-
. h.e safoty significance of this event'is considered to be r
'utdown condition with the OCCURRENCE:
. sinim.; since the reactor was in,ths i
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.,, c'avityl flooded. Ha'd a 14CA occurred l'n this condition,' the i
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'Syste:a. II. coro' spray purps which operated satisfactorily would ihave delivered core spray flow at rated' capacity but at a Iwer 5..
discharge pressure, assuming the booster pu::p failed to start.
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'Ihe'16'K114D relay was placed in the deenergized position which
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CORRBCTIVE
,is thestripped condition.
In this configuration, RV40B would
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4 chave ac,ted to sense inproper booster pump dis' charge pre
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and sta.rted the redundant pucp.
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FAIL 11RB DATA:
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