ML20028G417

LER 82-083/03L-0:on 821229,reactor Protective Sys Channel a Trip Units for Low Steam Generator Level,Low Pressure & Thermal Margin/Low Pressure Bypassed for Maint on Pressure Instrument.Caused by Transmitter Output Drift

ML20028G417
Person / Time
Site:	Calvert Cliffs
Issue date:	01/28/1983
From:	Hinkle L, Lagiewski J BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20028G414	List: ML20028G413 ML20028G417
References
LER-82-083-03L, LER-82-83-3L, NUDOCS 8302090321
Download: ML20028G417 (1)

Text

NRC FORM 366 U. S. NUCLE AR RE!ULATORY COMMISSION LICENSEE EVENT REPORT CONTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL CEQUIRED INFORMATl"NI 1 6 l0 l11 7 8 9 lM lDLICENSEE lC lCCODE lN l1 14l@l 150 l 0 l -l 0 l 0LICENSE l 0 lNUMBER 0 l 0 l - l 0 l 0 l@l 25 4 l 1LICENSE 26 l 1 l 1TYPE l 1JOl@l$7 CAT l b8 l@

CON'T IOIii Si" "J LL_j@l0 l 5 l0 10 l0 l3 l1 68 l769 Glil2 l2 l9 l8 l2 @l 0lREPORT EVENT DATE 74 75 il 2lDATE sl 8 h80l@

7 8 eso 61 DOCKET NUMBER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h lO l2l l At 0725, during normal shutdown operation, Reactor Protective System l l0 l3 l l Channel A trip units for low steam generator (SG) level, low SG pressure l 0 4 l and thermal margin / low pressure were bypassed for maintenance on 11 SG l

) 10 i s ll pressure instrument (T.S. 3.3.1.1) . 11 SG pressure transmitter was re- l 0 6 l calibrated and all instruments returned to service at 0855. The three l 0 7 l redundant channels remained operabic during this event. l l 0 is l l Similar event: 82-40/3L. 80 l

7 8 9 DE CODC S BC E COMPONENT CODE SURC DE S E

@ II l A lh (B_jh Wh I I I N I S I T l R l U lh Wh d h 12 13 18 19 20 7 8 9 10 11 SE QUENTI AL OCCURRENCE REPORT R EVISION LER/RO EVENT YEAR REPORT NO. CODE TYPE NO.

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(---J 23 l 0 l 813 l 24 26 d

27 l0 l3 l 28 29 lL l 30

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32 KN A O ONP NT ET HOURS SB ITT FOR b 8. SUPPLI MANUFACTURER I E l@(_X_jh 33 34 (Z_jh 35 Uh 36 l0l0l0l0l 31 40 W@ W@ W@

41 42 43 l44B l 0 l 8 l 047l@

CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l11O I l Cause of failure is the transmitter (Barton Instrument Co., Model 763). I i i l Tests done by Barton on this model found that the output drift is caused l lil7l l by leakage current paths to case ground after high temperature exposure. l lil3ll Installed transmitter performance will be monitored until repair or l t 4 l replacement. l 7 8 9 80 STA S  % POWER OTHER STATUS ISC R DISCOVERY DESCRIPTION (1,,j_5,,] (,D j h l O! O l 0l h ! N/A l [_Ajhl Operator Observation l A TlVITY CO TENT nELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE L,_[f ] W h [,,2) @ l N/A l l 45 N/A 80 l

7 8 9 10 11 44 PERSONNEL FXPO5URES NUMBER DESCRIPTION 1 7 l0l0l0lh(TYPE _z,jhl N/A l PERSONNE t inau' RIES NUMBER DESCRIPTION @

7 i R 8 9 10l0l0l@l 11 12 N/A 80 I

LOSS TYPE OFDESCRIPTION OR DAMAGE TO FACILITY [' s 1 9 W hl N/A l PususTY 8302090321 830128 NRC USE ONLY PDR ADOCK 05000317 7

2 o 8 9 issued

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@l N/A DESCRIPTION S PDR h l 68 69 lllllllllllll; 80 1; NAME OF PREPARER J. S. Lufsski/L. S. h kle PHONE: holi 269-4747/4986 {

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