ML19253A819

LER 79-037/01T-0:on 790828,SI-4145-MOV Containment Sump Suction Valve Was Open & SI-4143-MOV RWT Suction Valve Was Closed Causing One ECCS & One Containment Spray Sys to Be Inoperable.Caused by Valve Position.Valves Repositioned

ML19253A819
Person / Time
Site:	Calvert Cliffs
Issue date:	09/06/1979
From:	Davis S BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19253A818	List: ML19253A817 ML19253A819
References
LER-79-037-01T, NUDOCS 7909110435
Download: ML19253A819 (2)

Text

.

L 1 11, LICENSEE EVENI REPORT CONiaol H L OCK (

i

_]] l l l _h e

(PLE ASE PRINT OH TYPE ALL REQUlHED Ifd OHN1ATION)

TIB I

7 8 9 MltlCE OL_ClNSE E CODE Cl N 1]@l0l0 14 'S

-l 0l 0 01 0 t iC E *.S E % M 63 E R 0 -lJ11_aJGL4 l'> J6 11 1 l i l 11@l 21 L IC L ', Z TVPE JO I

Cai w le C ON' T lo 1

i 8

M/S lL_J@' 0l Sl0l0l01311 7 @l_01812181719J@

60 61 DOC m. E T %v8 E R 8A W f % ENT D ATE 74 15 Ol9l016lZj_9J@

HE POR T C ATE 80 EVEN T OFSCalPTION AND PHOB ABLE CCNSEGUENCES h l o 121 LAM 600 dur_ino_r.rarfarrant!Lof_a _sunci]Mro test, the onerator discovered that l o 3 lSI-4145-P3V (12 header containment surp suction valve) was open and SI-4143-MOV o 4 [(12 header RWT suction valve) was shut, causino one ECCS and one containment spray 1 o ,, systen to become inoperable (T.S.3.5.2 and 3.6.2.1). Upon discovery, the operator [

o c, [irrediately recositioned the valves to their proper position. The redundant i o i containment spray and ECCS systems renained coerable during the event. This is i o 3 lnot a repetitive occurrence. I

YS T EM C iUSE CAUSE CGMP '/ A L V E COCE LOOE SL8 CODE C'.;YPC N E N T CC OE suscCDE SU CODE o o I si FlO LAJ@ l ^ l@ l V I A I L l V I E l X l@ L1J@ l_ Dj @

y g 9 10 tt 12 13 18 19 JO SE OUE N TI AL OCCURHENCE p;r_ 1 M V'SION

, EVENT YE AR H E POR T No. CODE TYPE NO.

LI h HO

@ mCar l7l9] l-l 10l3]71 l/l 10111 Tl l-l l0 l 11 17 23 24 26 27 28 29 Ju 31 32 AC T ION FUTUAE EFFFCT LMUTDOWN ATT ACHYENT NPRD4 FPlVE CCYP. CCVSONENT T /.ar E N AC TION ON.PL A N T VfTHOD HOURS $L Rut T T E D FORMSUS SUPPLIER V A'.U F AC TU R E R lX JJ l@lJ4X l@ Lzj@

35 lzi@

36 31 010l0l 40

[41 Y l@ [Nl@ Zl@ lV 018l5[@

44 42 43 47 CAUSE DESCRIPTION AND CCRPECTIVE AC TIONS h

[T a 10n 8-27-79, the Control Room Onerator inadvertently shut SI 4143-90V while returnino I li 11 1 lECCS systen to nornal followino surveillance testino of E! 4145 "0V. The irrediate  !

Icorrective action was to shut SI-4145-M3V and onen SI-4143-MOV. Further corrective 3 3 jaction will be to initiate a color signalino system to aid onerators in verifvino l 4 [nroner position of ECCS valves and niace nosition enunciators on RWT suction valves. 1 7 8 9 80 ST 5 '6 POWER OTHER$7ATUS b CO R DiSCOVr a y ciS Ripy sq i s lDl@ l0 0l0j@l NA l lBl@l Ocerator Observation l ACTIVITY CO TENT 54 F L F A',E D CF RF L E ASE AUGUNT Cf ACTIVITY LOC ATION OF RE L E ASE r,

7 d 3 lZl@ W @l 10 11 NA 44 45 NA 80 l

?!,arcssptEupcsewEs

. ME R TYPE DESC hPTION 1

l[ l[ l[]@f [f@l

N

'o l

m d',s as -

um .

,k..,mNe l Z l Z l Z @[m PTic. @ NA l 1 4 3 it 12 80

/ ;s ..m. Cr ACE 10 s ac L; Tv

,c[ '; t 1 ****'ON j

i 4 3 a a m ~@ m, 79091io 9'3 5 u_u iii<r !i!:;

I o u ti i i 5J ;

7 3 3 O 63

, ,3 ,p . g

b. u. ' avis p.,

. a. - f20l) 23$-7 N_.2 _ f,

LER 79-37/01-T DOCKET NO. 50-317 EVENT DATE 08-28-79 REPORT DATE 09-06-79 AT TACHMENT CAUSE DESCRIPTION AND CORRECTIVE ACTIONS:

On 08-27-79 while returning 1-SI-4145-NOV (12 header containment sump suction valve) to its norral pcsition following a survei,llance test, the operator instead shut 1-SI-4143-MOV (12 header refueling water tank suction valve).

The hand switch for each valve is identical in appearance and located in close proxinity on the control board. Upon discovery of the niispositioned .

valves, SI-4145-MOV was shut and SI-4143-90V opened. The surveillance test that was being performed is performed on a nonthly basis on each unit and this is the first such occurrence of an error in restorinc a system following a test.

In order to prevent a recurrence, a color sicnaling systen will be instituted to aid the operators in easily verifying that all ECCS valves are in their normal position. This system will involve placing colored signal dots next to each ECCS valve, thus allowing the operator to match the position of the valve with the colored signal dot. At each shift turnover, the oncoming operator will verify that all ECCS valves are in their proper position. In addition, an alarn will be added to each RWT suction valve to enunciate in the Control Room if the valves are shut.

P G $ )