05000317/LER-1981-030-03, /03L-0:on 810424,reactor Protection Sys Channel a Containment Pressure Trip Unit & ESF Actuation Sys Channel Zd Containment Pressure Sensor Placed Out of Svc to Replace E/E Convertor.Isolator Failure Might Be Due to Mod Work

/03L-0:on 810424,reactor Protection Sys Channel a Containment Pressure Trip Unit & ESF Actuation Sys Channel Zd Containment Pressure Sensor Placed Out of Svc to Replace E/E Convertor.Isolator Failure Might Be Due to Mod Work

ML20027C809
Person / Time
Site:	Calvert Cliffs
Issue date:	05/22/1981
From:	BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20027C805	List: 05000317/LER-1981-030, Forwards LER 81-030/03L-0 05000317/LER-1981-030-03, /03L-0:on 810424,reactor Protection Sys Channel a Containment Pressure Trip Unit & ESF Actuation Sys Channel Zd Containment Pressure Sensor Placed Out of Svc to Replace E/E Convertor.Isolator Failure Might Be Due to Mod Work
References
LER-81-030-03L-01, LER-81-30-3L-1, NUDOCS 8210270257
Download: ML20027C809 (1)

LER-1981-030, /03L-0:on 810424,reactor Protection Sys Channel a Containment Pressure Trip Unit & ESF Actuation Sys Channel Zd Containment Pressure Sensor Placed Out of Svc to Replace E/E Convertor.Isolator Failure Might Be Due to Mod Work

Event date:
Report date:
3171981030R03 - NRC Website

text

sio p LICENSEE EVENT REPORT

.,y.

e CONTROL 8 LOCK: l l l l

l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI i

6 lil 19101 C I C I n l 11@! 010 l-1010101010 l-1010 l@l411 11 1111 l@l I l@

8 9 LsCthsEE CODE 14 is LICEN5E ~vveE.

26 26 Ll;Es&E vv,E J3 67 GAT be 3*d*T 1il

" % l L l@l 0 l 5 l 0 l 010 l 31117 l@l 014 l 2 l4 l 8 l1 l@l0 l5 l2121811 j@

s S

60 61 DOCK E1 NUMB E R 68 69 EVENr DATg 34

'S PE, oar oaf g u

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h

~

121 l At 0B25 durine' normal coeration, Channel "A" RPS Containment Pressure l

,,3i l Trio Unit (T.S. 3.3.1.1), and ESFAS Channel "ZD" Containment Pressure l

@l -

Sensor were placed out of service to reolace an E/E converter (T.S.

l

,,s;l 3.3.2.1).

Both instruments were returned to service at 0010. ' The three j

.g1l redundant channels for RPS and ESFAS remained operable durino this event.

l

. gig l LER's 81-07 and 05000318/81-08 describe similar occurrences.

i1a 11 I

$ct

"#"o*E sNCo$E Cc COMPONENT CooE sV8 o'dE s C E E

I II 8 l@ LE,J@ [E_J@ l Il Nl Sl Tl RI Ul@ [Ej@ W @

5 9

10 11 12 13 18 19 20 tve~rve,a lies"r'a' "SS!**'

"Ki"'

"'"E "

C

@ lu.,,o l218 l1 I l-J l 0l 3l 0l [g_j l 0l 3i LL_1 L---J LOJ gig 22 23 24 26 27 28 29 30 31 22 1

N A

.t oN Pt N1 ME HCU s 22 sB a Fo S.

suPPLIE 5tANU.AC aEa

[ A_jgl24Zl@

lZl@

l Z_j@

l0 l0 l0 lU l

!g l@

[ylg lal@

jy lp lg l7 lg 35 36 37 40 41 42 43 as 47

' 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 El Mithin 24 Hrs. of receivino accroved power sucolv (PS) modifications, f ro-I mI lator 1-E/E-5313A (Transmation #230lT) failed uoon loss of its +15 05.

1 1ni The isolator was replaced and will be recaired bv its Mfr. Failure may I

yl have been induce'd durino modification work. No other modified isolators I

gi have failed. No preventive actions are nresently deemed necassarv.

I

'sr*M orwEas,Arus @

oisEoNav' orsCovrav ossCaierion @

seowea

.L1 LIJ@ 11 Io 10 l@l NA l

[f_J@l Ocerator Observatien l

' Aivir. Co'#rE~r

.uou~r or.Criviry @ l tocarioso,aiusE@

E LZJ @o oracu.sELZ_J@l ar u isi NA l

NA.

l

...so~~clex,osses NUVeta rvPE DEsCRt,rloN E I 0l 0 i Ol@LZ_J@l NT l

.insos~d'i~2v'a'iEs oisca.,rio~@

~ uo...

E I 010101@l NA I

80 4 9 11 12

$i's " " s'C"',Vo'? '" @

E IZl@l NA I

50 6 3 10 DEsCaiPriON E] ssygf@l.

1" N4 I

l.

B210270257 810522 PDR ADDCK 05000317 S

PDR