ML19210C421

LER 79-062/03L-0:on 791019,spurious Trips Occurred on Channel a High Power Trip Unit.Caused by Intermittent Elevation of Resistance Temp Input.Detector Leads Lifted & Operations Continued

ML19210C421
Person / Time
Site:	Calvert Cliffs
Issue date:	11/06/1979
From:	Lagiewski J, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19210C419	List: ML19210C417 ML19210C421
References
LER-79-062-03L, LER-79-62-3L, NUDOCS 7911140229
Download: ML19210C421 (1)

Text

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UCENSEE EVENT REPORT CONTR ol S LOCK: l I i i l I lh 6

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) -

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8 9 L.CENSEE CODE 5 con'T 0 t B

c l L )@ 015101010 ! 31117 l@l 11011191719 !@ll E3 61 COC<ETNisv3E% 68 69 EVENT C ATE 74 'S 11101617 RE*0AT CATE t o l@

80 EVEN? OESCRIPTION AND P=CRABLE CONSECUENCES'h o f :i ( Durino steady state operations, several sourious tries on channel 'A" I hiCh cower occurred. At 1109 an Channel "A" hich power trio unit was I o 2i i o i ., ;

bvoassed oer T.S. 3.3.1.1, Action 2. All other 00S trio units romained I o 5 l ocerable throuchcut the event. Chanc.el "A" hich newer trio unit was I o is  ; returned to service at 1110 an. LE7 79-25 (U-1) describes a sirilar 1 ai7!Ievent, j l

i aisi l 33 e 3 COvP VALVE S v 5 T E *M CAUSE CALSE 2005  ;COE SL20 CE COUP 0'.EN? 000E SLaCO:s SVBOOCE latai l II A l@ I E l@ IE l@ I N IS IT iP. IU l@ l E l@ l Z j @

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< E OL ENT' AL O CC.; m a E *.CE mEFCaT mEvisiCN E'v ENT ' E A R R EPCRT NC. COCE TYPE NO.

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.a l-l 21 l 01 32 E*880' ANACraYCNT NPAD4 #C:YEOCY8 COYPONENT ACTION svTvaE Sw u T O O /.N vcNuraCrgmER TAvEN eCH ON C a. p ' a N T VE -a C O w0.oS SLSv'TTEO #CA M s.,3. SL88L'Em IXl@lX l@ I I@  ! ly @ ,

a, 1 0] 0l 0 40 l l Nlg 41 lY lg lU l g l Rj3 l6 l9 l g 4; 43 44 47 20 a4 .3 .6 CAusE oss:=.aricN ANc cRRECrive ACTicss @

, a l The Tc2 resistance tercerature incut was #ound to be interrittentiv i 3 i hich. The detector leads were li'ted and ocerations centinued with i

,  ; ] the remaininc Channel "A" Tc incut functionino, orobable cause of l 3 3 ] failure is failure of the tercerature elerent or loose teminations in J Lthe field. The eroblem will be corrected durine the next cold shutdown.

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' PC a 9 OTwE A STATUS iSCO DY DSCOVERY OESCRIPTION STA S a P C .'. E A i e lEl@ lll0l0l@l N/A l l Al@l Ooerator Observation l ACTIVITY C TENT aELEAseo Or aELEasE AvcvNT cs ACTIVITY @ to:ATicN C= =ELEASE @

l N/A l 7

1 6 8 9 l 2l h l 2l@ 10 l N/A 11 44 45 80 PERSONNEL EXPCSUAES NUYetR TYPE CESCRIPTICN -

i 7 101010 l@L2j@l N/A "

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.ERSaNNEL,N;u2iES NLveEa OESCRIPTION 7

i a 8 3 101010l@l N/A 11 12 30 LOSS Cr ca O AMAGE TO FACILITY Q T**E C E SC AiPTION  %./

i 9 I Z i@l10 N/A 80 7 8 9 PL8LICITY NRC USE ONLY 7911140 2 I i llIlillliII15 7

2 o g 9 iSSu 1 Zl Ee@oESCainicN l

70

?!/a 68 69 80 1 Nave og RnE ARER J. S. babMP. G. Wo PHONE. (301)234-7942/7986 1,