ML20151C178
| ML20151C178 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 10/01/1973 |
| From: | Reeves D JERSEY CENTRAL POWER & LIGHT CO. |
| To: | |
| References | |
| AO-73-25, NUDOCS 8103040932 | |
| Download: ML20151C178 (2) | |
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JP4 port.No. 73-25 Fallore of isolation Condenser initiation relay 6K12 to func-Sim]Iicr:
tion when docnergized wh'ile herforrning rout.ine surve1111alce.
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'Ihis.evant is Monsidered to be an Nnormal occurrence'as defined in the Technical specifications, paragraph 1.15D. Notification
'of.this event, as required ify the Technical Specifications, i
paragraph 6.6.2.a, was nado to AEC Region I, Directorate of Rcgvlatory Operations, by telephone on $sturday, September 20, 19"3, at 1:35 p. a,f.: and.by' telecopier.on I4ond:.y,. October.1, 1975, at 12:Ob'p, n.
7 SITW. TION: h'ntle perforcing a routino surycillance test on the Reactor liigh Pressure - 1 solation 'Condensor initiation switches, con-i' tacts on r af uy 6K12 failed to open within the preset time delay of 15' seconds after tripping the pressure switch and deenergizing j
the relay, l
CAUSEt Unknown. The relay has since been removed fro:n the circuit and
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bench tested and appears to function properly.
FIMi? DIAL ACTION:
Relay 6812 was replaced with one from Spares. A satisfacton surveill.mce test was conducted and the Isolation condena.er System then considered to be operable.
THIS DOCUMENT 00'NTAINS f/OJO kd pgg POOR QUAUTY PAGES. '
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/d>nor:21 Occurrence Septerher 28,:1973
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_P'.qTf SIGIT F.T_C_AN_C_E:
5 As det' ailed in Amendment '67 to the FPSAP., at least one of the '
Isolation Condenr,ers is required to set as a means"for heat renoval during a postulated Loss of Coolant, Accident. Actust' ion of relay W.12 can be by means or' High Reactor Pressure or I,ow-I,w nenctor Water Level.
It' is wired into the lod e circuit--
such that tripping of the relay 'provides one-half of.the initia-i tion logic for both condesprs,.the other one-half being its redundant counterpart on the sae instrucent penetration. A second redundant ins,tntment penetratie, also includes two pres-sure switches, contuits from whicli also will initiato both iso-l 1ation condonscrs. _The $ignificance of this event then is the loss of redundancy provided td inittste one-half 0f the signal for pIncing the T8clation Condenser System in service.'
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-- Date:
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