ML19257A348

LER 79-070/03L-0:on 791122,during Log Readings,Discovered That Reactor Protection Sys Channel C Containment Pressure Signal Had Deviated by Greater That 0.1 Volts from Other Channels.Caused by Faulty Isolator 1-E/E-5313C

ML19257A348
Person / Time
Site:	Calvert Cliffs
Issue date:	12/20/1979
From:	Davis S BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19257A347	List: ML19257A346 ML19257A348
References
LER-79-070-03L, LER-79-70-3L, NUDOCS 8001030797
Download: ML19257A348 (2)

Text

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LICENSEE EVENT REPORT control block: l l l l l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 o i 8 9 lMIDlClClNl 1 l@l 010 l- 10 l0LICENSE 14 15 l 0 lNUMBER 0 l 0 l- [0 l 0 25l@l4 26 l1LICENSE l1 l1TYPE l 1JOl@l 57 CAT l 68 l@

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60 l l l@l 0 l 5 l DOCKET 61 0 l 0NUMBER l 0 l 3 l 1 68[ 7 69l@l 1EVENT l1 DATE 12 12 l 719 l@llREPCRT 74 75 1212 DATEl 017 80 9l@

EVENT DESCRIPTION AND PRCBABLE CONSEQUENCES h o 2 l At 1800 the Control Rcom Ocerator while takina 100 readings discovered I ola t reactor protection system channel "C" centainment pressure signal had l 0 4 [ deviated by 9reater than 0.1 volts from the other channels. The Channel I o s Iwas bvpassed in accordance with T.S. 3.3.1.1 to accommodate recairs. The I o s I three redundant channels remained ocerable durinc the event. Channel "C" I oi7 I containment cressure was returned to service at 1310 on 11/23/79. This l I is a recetitive occurrence for this tyre of instrument. I cis 80 7 8 9

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A, 3 ,' 40 41 l42Y l@ 43 44 47 CAUSE DESCRIPTION AND CCARECTIVE ACTICNS h i lo I Feund isolater 1-E/E-5313C to have a low cutrut for its inrut sicnal level, 1 ti ITne instr n ent cculd not be calibrated ard was vaniaced with a stocbd I

!, 2 1 scare. The instrument is a Tran7ation "Odel 230T isolatine transnitter. I ii i2 i Recent Transmation correscendence has succested the use of vil. Scec. I i A I cacacitcrs to decrease failure rate of this mcdel. 30 i

3 3 5  % POWER CTMER STATUS Di RY DiSCCVERY CESCRIPTION Is W @ l 01 6l Ol @ n N/A l l Bl@l Operator Observaticn l

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LER NO. 79-70/3L DOCKET NO. 50-317 EVENT DATE 11/22/79 REPORT DATE 12/20/79 ATTACH.'ENT CAUSE DESCRIPTICN AND CORRECTIVE ACTION: (C0tiTINUED)

Plant personnel are presently investigating best means to accerolish the change.

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