ML19309F449

LER 80-019/03L-0:on 800327,during Normal Operation,Channel B Loss of Load Trip Occurred Intermittently.Caused by Auxiliary Master Trip Relay end-of-life Type Failure

ML19309F449
Person / Time
Site:	Calvert Cliffs
Issue date:	04/25/1980
From:	Lagiewski J, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19309F435	List: ML19309F434 ML19309F449
References
LER-80-019-03L, LER-80-19-3L, NUDOCS 8004290472
Download: ML19309F449 (2)

Text

{{#Wiki_filter:/ . . .. , (7 77) LICENSEE EVENT REPORT n- = (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 80 0429 0 Q v CONTROL BLOCK: l 1 l l l l l lh 6 l l l lo lil8l 9MI Ol 7 cl c l til l l@l o l o l LICENSEE CODE 14 15 l OLICENSE l o l NUMSER 0 l 0 l o l- l O 25l o l@l 26 4 l i l TYPE LICENSE i l llJO11@$7 CAT Sd @ l CON'T 10111 5O "E'

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EVENT CATE 74 REPORT DATE 80 7 8 60 61 QOCKET NuvaER EVENT DESCRIPTION AND PROBABLE CGNSEQUENCES h i 10121l At 0910. durino nomal oceration. channal A ina nr 1nna +rin im4t so33 LO i a i l bypassed for corrective maintenanco nor T3- 111 1 channo1.a in n nf i 1014 l l load trip was returned to service at 1410. At 1040 on 4/1/80 channel B loss I i O i s i L of load trip unit was again bypassed for additional maintenance. Channel B l 10 te i i loss of load was returned to service at 1400. All three redundant channale i 10171I remained operable throuahout these events. This hac nnt heon a renotit4ye l 1 I O is I I occurrence. ,,

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8sM" *^'# CO SSME CO eONENTCOoE $#C/cE S2?oE 10l9l l Hj Al@ l El@ l Fl@ IR lE lL l A lY lX l@ l Cl@ l Zl@ 13 19 20 7 8 9 10 11 12 13 SEQUENTI AL OCCUR AENCE REPORT REVISION EVENTvEAR REPORT NO. CODE TYPE N O. LER RO O agg s 180l 01 l-l 10l1191 ]/] l013 l lL l l-l 10 l 32

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J3 34 lZl@ 35 IZl@ 36 l0l0l0l 37 l 40 l41 Y l@ l42N l@ l43L l@ lGl0l8l0l@ 44 47 CAUSE DESCRIPTICN AND CORRECTIVE ACTIONS l i l o t i The cause of the intarmittant inu nfinRd tring,ses dete-ined te be 3 I til3j l faulty auxiliary master trio relav (General Electric Co. Model CR l'20 HF A7 .1 10 ai l i i, ,2i 1 within the Main Turbine EHC cabinet. This is considered to be a natural end l i 131 I of life tvoe of failure due to comoonent ace for the 24 VDC relay. The relay I ii i4 i i was replaced with a spare. I 80 7 8 9

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       '                                          i2        n                            44 8JTiviTY eORTENT REtEASE                                                                                                         LOCATION CF RELEASE li is 8I 9W @o On aELEASEW@l                          AMOUNT     NA             OF ACTIVITY 44 l

45 NA @l 80 l 7 to 11 PERSONNEL EXPOSURES NUMBER TYPE CESCRIPTION - I I i I 7 l 1010 10 l@l 2 l@i NA 8

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PE RSONNE'L iN3u'lES Nuv8Ea oESCRiPTiON@ l li la 8l 101010 7 9 11 l@l 12 NA 80 LOSS OF OR DAMAGE TO FACILITY TYPE DE SCRIPTICN I119I(Z_j@l NA 80 I 7 8 9 10

• ISSUE 12101 [[L [@ l DESCRIPTIONNA I lIIIIIIIi!II15 7 8 9 10 68 69 80 5 NAME OF PREPARER d. S. LaQiewski/P. G. Rizzo psCns:(3011269 47a7/47A6 2 l

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;         LER N0.        80-19/3L i         DOCKET NO. 50-317 EVENT DATE     03/37/80 REPORT DATE    04/25/80 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACT.IdNS:   (CONTINUED)

No preventive action is deemed necessary.

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