ML20062D036

/03L-0 on 781025:during Oper,Reactor Protec Instru Wide Range Logarithmic Neutron Flux Monitor Channel a Read 2 Decades Lower than Other Channels,Due to Connector,For Channel a Not Being Dried Completely When Recently Cleaned

ML20062D036
Person / Time
Site:	Calvert Cliffs
Issue date:	11/10/1978
From:	Davis S, Romney K BALTIMORE GAS & ELECTRIC CO.
To:
Shared Package
ML20062D035	List: ML20062D031 ML20062D036
References
LER-78-037-03L, LER-78-37-3L, NUDOCS 7811170171
Download: ML20062D036 (2)

Text

- . . - - _

LICENSEE EVENT REPORT

.. ~=

1. CON 7 POL BLOCK: l i

l l l l l 6

lh (TLEASE P7. INT OR TYPE ALL REQUIRED INFORMATION) o i lM l nL6CENSEE l C IC In l 2 l@lo lo l lo lo lo lo lo l lo lo l@lh Il li 1111 l@l57 CAT 25 I

68 l@ l 7 8 9 CODE 14 15 L. CENSE NUM8ER 26 LICENSE TYPE JO j CON'T R 8 5 E d@ l0 l0 l0 l3 l118 hl110 l2 l5 l718 l@l1 l1 l1 lo l7 l8 l@ 69 69 EVENT D ATE 74 75 REPORT DATE 80 7 60 61 DOCKET NUMSER EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h O 2 l At 1350 Reactor Protective Instrument vide ranse Locarithr ie Neutron 1 O l flux monitor Channel A was discovered indicating two decades lover I o 4 lthan Channels, B, C and D. Channel A vas declared inoperable and start- 1

@ l up rate Channel A trip was bypassed at ih05 as required by T.s.3.3.1.1. I O s l Channel A vide range flux monitor and start-up rate trio vere returned 1

['O"Til I to service at 1520. Channels B, C and D remained operable during the 1

[Olajlevent. LERs 77-70 U-l and 78-8 U-2 describe similar events. 1 DE CODE S SC E COMPONENT CODE SUSCOO'E SU E I.O.,L9 I I I I ^ l@ 1.E_j@ LA_j @ l X l X l X l X l X l X lh [Z,j@ [Z_l @

7 8 9 10 11 12 13 18 19 20

,,, SEQUENTIAL OCCUR R ENCE REPORT REvlslON EVENT YE AR REPORT NO. CODE TYPE N O.

@sg a LER RO

_ 21 I 7l 8l 22 L--J 23 l 013l 71 24 26 l/l 27 10131 28 a IL l 30 1-1 31 l0l 32 T K r A O ON PL NT ~ M HOURS 22 38 i FOR 8. SUPPL MANUF CTURER lB [gl34Zlg lS Zlg l 0l 0l 0l l J g lN]g [Zjg lZl9l9l9l@

33 J l36Zl@ 37 40 41 42 43 _ 44 47 l CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 g lDuring our recent refueling outage the connectors for Channel A, B and I i g lD vere disconnected. All three connectors were cleaned and dried durin.? I l

l , 7 lreconnection. Apparently Channel A connector was not dried completely. _

l 3 lThe connector was disconnected, cleaned, dried and reconnected. Channel l g l A was re-energized and operated correctly. The foreman has reviewed l 7 8 9 80

! ST S  % POWER OTHER STATUS DIS O Y DISCOVERY DESCRIPTION i 5 W @ l0l0l0l@l N/A l l B l@l Operator observation l ACTivlTY CO TENT AMOUNT OF ACTIVITY LOCATION OF RELEASE i 6 [Z_j RELEASE @D OF RELEN/A ASEl_Z_l@l l l N/A l 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION i 7 l0l0l0l@lZl@l N/A l PE RSONNe'L'iN;u7t ES NUMBER DESCRIPTION 7

i a 8 9 l0l0l0l@l 11 12 N/A 80 l

w,c'c",c,.s'r'c"'@ 7811170I2I 9

lZl@l N/A l 7 48 9 10 80 7

2 0 8 9 ISSUE10 @l ESCRWTION N/A l 68 69 l l l l llll l l l lJ { 80 ;

NA'JE OF PREPARER

• * *

• I PHONE: 301 23h-79h2/7960 g

_ _ _ _ = ._ _ ___.___ _. _ _ _ _ . _ __ .. .. ._ . -_ _ _ _ _ _ . _ __ ___ __ _

,,+ . .*.

- e ATTACHMENT TO:

,r LER 78-37 DOCKET NO. 318 EVENT DATE 10/25/78 REPORT DATE 11/10/78 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS (continued) the cleaning procedure with his personnel to insure that this problem does not recur.

i o

h 9

e f

E) 1 i l N

.- -- - - . . ,, . . . . .-. -- --