ML19305E797

LER 80-026/03L-0:on 800428,pressurizer Level Control Channels LT-110X & LT-110Y Were Removed from Svc After Erratic Changes in Pressurizer Level Occurred.Caused by Leaking Drain Valves in Transmitter 2-LT-110Y.Valves Shut

ML19305E797
Person / Time
Site:	Calvert Cliffs
Issue date:	05/16/1980
From:	Davis S, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19305E792	List: ML19305E791 ML19305E797
References
LER-80-026-03L, LER-80-26-3L, NUDOCS 8005200445
Download: ML19305E797 (2)

Text

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LICENSEE EVENT REPORT S 0052 no /j4/7 Q CONTROL BLOCX: l i

l I i 1 l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) lo l s8 9l IM lLICENSEE 7

o I C Cout I C IN 12 l@l 0101 -l le 15 0101010101_I 01 LICENSE NUMSER 25 Ol@l26 41 il TYPE LICENSE il il JO I il@l57 CAT 58 l@

CON'T 10111  % $ l Ll@l 01 5101010131 1181@l 68 69 014121 EVENT DATE alRInl@lnlgl 74 75 i l Al el nl@

REPORT DATE do

? 8 60 61 OOCKET NUMBER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES O'o I

10121 I AT 1750 PRESSURIZER LEVEL CONTROL CHANNELS LT-110X AND LT-ll0Y WERE SIMULTANE0USLY R I IO I 3 I I EMOVED FROM SERVICE FOR CORRECTIVE MAINTENNICE AFTER THE OPERATOR EXPERIENCED LT-110X AND LT-110Y l 10141 IERRATIC LEVEL CHNIGES IN PRESSURIZER LEVEL (T.S. 3.3.3.6).

I I O I s i IWERE RETUR'IED TO SERVICE AT 1930. THE OPERATOR CONTROLLED PRESSURIZER LEVEL I

I O f 61 10N START-UP CHANNEL LT-103 DURING THE EVENT. THIS IS NOT A RFPFTITIVF OCCURRENCE.

l 10171 l I

101811 DE CODE SUSCO E COMPCNENT CODE SUSCODE 5 E loI91 lI lC l @ @_j @ l XI @ IV IA Il IV lE I X l@ l Fl@ L P.j 19 20 7 8 9 10 11 12 13 18 gg EVENT YEAR REPORT O ODE N .

@ a(yg.po 18101 21 22 1-I 23 1012161 24 26 1/l 27 10131 28 29 U30 I-I 31 I 01 32 TAKEN A TC ONP NT MET HOURS S B IT D FOR S. $UPPLI R VAN FACTURER lx l@l 34H i@ LZj@ IZI@ 101010101 LY_J@ DLIO I43Al@ lWl11615l@ 47 33 35 36 37 40 41 42 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS I

I i I o 1 IDURING TROUBLESHOOTING EFFORTS BOTH DRAIN YALVES FOR TRANSMITTER 2-LT-110Y WERE 1

It IiI IFOUND TO BE LEAKING THROUGH. THE IMMEDIATE ACTION WAS TO SFCtlRFIY 94tlT ROT 4 I

ii 1IVALVES. THE LEVEL MISMATCH WHICH RESULTED IN THE CORRECTIVE MAINTENANCE ABOVE I

Ii13IIWAS CORRECTED.

l 11 1411

'sTANs  % POWER OTHER STATUS DISCO RY DISCOVERY DESCRIPTION IiisI(Lj@ l110l0l@l NA I LA_.j@l OPERATOR OBSERVATION l

'JTivlTv CsTENT aELE ASED OF RELE ASE AVOUNT OF ACTIVITY LOCATION OF RELEASE NA I l NA l Ii' Is 'I LL]'

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.ERsONNELEx,0sSEs Nuo.ER T ,E oEsCRiPT,0~@

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li l a 81 910 10 1011l@l12 NA 20 7

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N A*.tE OF PREP ARER

. M. DAVIS /P. G. RIZZO Psong;(1n1bso_a7a2f_t7eg i

LER NO. 80-26/3L DOCKET NO. 50-318 EVENT DATE 04/28/80 REPORT DATE 05/16/80 ATTACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:

THE DRAIN VALVES MAY HAVE BEEN INADVERTENTLY OPENED AND SHUT DURING AN OUTAGE FOR CORRECTIVE MAINTENANCE. TO PRECLUDE A RECURRENCE OF THIS EVENT, INSTRUMENT ORAIN VALVES IN THE VICINITY OF LT-110X AND LT-110Y WHICH REQUIRE ROUTINE MANIPULATION DURING EACH OUTAGE WILL BE TAGGED FOR IDENTIFICATION PURPOSES.

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