05000317/LER-1980-019-03, /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

/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: 05000317/LER-1980-019, Forwards LER 80-019/03L-0 05000317/LER-1980-019-03, /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
References
LER-80-019-03L, LER-80-19-3L, NUDOCS 8004290472
Download: ML19309F449 (2)

LER-1980-019, /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

Event date:
Report date:
3171980019R03 - NRC Website

text

/

(7 77)

LICENSEE EVENT REPORT 80 0429 0 Q

=

n-CONTROL BLOCK: l l

l l

l l

lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) v 1

6 lo lil l MI Ol cl c l til l l@l o l o l l O l o l 0 l 0 l o l-l O l o l@l 4 l i l i l ll 11@$7 CAT Sd @

l l

7 8 9 LICENSEE CODE 14 15 LICENSE NUMSER 25 26 LICENSE TYPE JO CON'T 10111 5O,y lL l@l 0! 510 l 0 l 0 ] 311 l 7 l@l 013 l 217 ] 8 l 0 l@l0l4l2l5]8l0]@

"E' 7

8 60 61 QOCKET NuvaER 6d 69 EVENT CATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CGNSEQUENCES h 10121l At 0910. durino nomal oceration. channal A ina nr 1nna +rin im4t so33 i

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

renotit4ye l

10171I remained operable throuahout these events. This hac nnt heon a

1 I O is I I occurrence.

$#C/cE S2?oE 8sM"

• ^'#

SSME CO eONENTCOoE CO l Hj Al@ l El@ l Fl@ IR lE lL l A lY lX l@ l Cl@ l Zl@

10l9l 7

8 9

10 11 12 13 13 19 20 SEQUENTI AL OCCUR AENCE REPORT REVISION LER RO EVENTvEAR REPORT NO.

CODE TYPE N O.

O agg 180l 01 l-l 10l1191

]/]

l013 l lL l l-l 10 l s

,21 22 23 24 26 27 23 29 30 31 32 T K N A ON ON PLANT E

HOURS 22 SB IT FC 1 8.

SLP t.tE MANUFAC LRER lAl@lZl@

lZl@

IZl@

l0l0l0l l

l Y l@

l N l@

l L l@

lGl0l8l0l@

J3 34 35 36 37 40 41 42 43 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

1 within the Main Turbine EHC cabinet. This is considered to be a natural end i

i,,2i 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

$A S

% POWER OTH ER STATUS ISCOV Y DISCOVERY DESCRIPTION It IsI[C.j@ l0l9l5l@l NA l

l A l@l Ooerator Observation l

i2 n

44 as as 80 8JTiviTY eORTENT AMOUNT OF ACTIVITY @ l LOCATION CF RELEASE li is I W @o On aELEASEW@l REtEASE NA l

NA l

7 8 9 to 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE CESCRIPTION I i I 7 l 1010 10 l@l 2 l@i NA I

8 PE RSONNE'L iN3u'lES oESCRiPTiON@

Nuv8Ea li la l 101010 l@l NA l

7 8 9 11 12 80 LOSS OF OR DAMAGE TO FACILITY TYPE DE SCRIPTICN I119I(Z_j@l NA I

80 7

8 9 10 12101 ((L [@ DESCRIPTION ISSUE l

NA I

lIIIIIIIi!II15 68 69 80 5 7

8 9 10 d. S. LaQiewski/P. G. Rizzo psCns:(3011269 47a7/47A6 2

NAME OF PREPARER l

LER N0.

80-19/3L DOCKET NO.

50-317 i

EVENT DATE 03/37/80 REPORT DATE 04/25/80 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACT.IdNS:

(CONTINUED)

No preventive action is deemed necessary.

e

(

l l

l