05000318/LER-1980-026-03, /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

/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: 05000318/LER-1980-026, Forwards LER 80-026/03L-0 05000318/LER-1980-026-03, /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
References
LER-80-026-03L, LER-80-26-3L, NUDOCS 8005200445
Download: ML19305E797 (2)

LER-1980-026, /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

Event date:
Report date:
3181980026R03 - NRC Website

text

'

(7 77)

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

I i

1 l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) i lo l s l IM l o I C I C IN 12 l@l 0101 -l 0101010101_I 01 Ol@l 41 il il il il@l I

l@

7 8 9 LICENSEE Cout le 15 LICENSE NUMSER 25 26 LICENSE TYPE JO 57 CAT 58 CON'T 10111

% $ l Ll@l 01 5101010131 1181@l 014121 alRInl@lnlgl i l Al el nl@

?

8 60 61 OOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE do EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES O'o 10121 I AT 1750 PRESSURIZER LEVEL CONTROL CHANNELS LT-110X AND LT-ll0Y WERE SIMULTANE0USLY I

IO I 3 I I EMOVED FROM SERVICE FOR CORRECTIVE MAINTENNICE AFTER THE OPERATOR EXPERIENCED I

R 10141 IERRATIC LEVEL CHNIGES IN PRESSURIZER LEVEL (T.S. 3.3.3.6).

LT-110X AND LT-110Y l

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.

I 10171 l 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 @

7 8

9 10 11 12 13 18 19 20 gg EVENT YEAR REPORT O ODE N.

@ a(yg.po 18101 1-I 1012161 1/l 10131 U

I-I I 01 21 22 23 24 26 27 28 29 30 31 32 TAKEN A TC ONP NT MET HOURS S B IT D FOR S.

$UPPLI R VAN FACTURER lx l@l H i@

LZj@

IZI@

101010101 LY_J@

DLIO I Al@

lWl11615l@

33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS I i I o 1 IDURING TROUBLESHOOTING EFFORTS BOTH DRAIN YALVES FOR TRANSMITTER 2-LT-110Y WERE I

It IiI IFOUND TO BE LEAKING THROUGH. THE IMMEDIATE ACTION WAS TO SFCtlRFIY 94tlT ROT 4 1

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

Ii13IIWAS CORRECTED.

I 11 1411 l

'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 Ii Is I LL] @ Lz1@l NA I

l NA l

.ERsONNELEx,0sSEs oEsCRiPT,0~@

Nuo.ER T,E 101010 l@l Zl@l NA J

i 7

,ERsON~Et t~,U4Es NLYSER DEsCRIPflON li l a 1 10 10 10 l@l NA l

7 8 9 11 12 20 T,5 "c E s "^P T ON' ' ' " " @

^

E

[ t 19] {Z_j@l NA l

7 8 9 10

.0 IMUEf@DE CRIPTION IN l

NA I

11Il111111ILJi -

2 o 7

a 9 to 6s 6e

.2. ;

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

N A*.tE OF PREP ARER

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.

E e

f d