ML20042A594

LER 82-007/03L-0:on 820213,during Routine Surveillance of Reactor Level Switch LIS 2-263-58B,setpoint Found to Be Above Tech Spec Limit.Caused by Instrument Setpoint Drift. Switch Adjusted

ML20042A594
Person / Time
Site:	Dresden
Issue date:	03/09/1982
From:	Schroeder B COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20042A586	List: ML20042A585 ML20042A594
References
LER-82-007-03L, LER-82-7-3L, NUDOCS 8203230590
Download: ML20042A594 (2)

Text

LICENSEE EVENT REPORT COkTROL sLOCx: l l

= 1 l l l l l@

(PtaAss PRINT OR TYPE ALL CEQUIREO INFOCMAT10N) l 0 l.1 7 e sl l I !ucassesL l D caos l R l S ! 2 l@l 0 l 0 l -ucsNsa i4 is l 0 l Nuussa 0 l 0l 0l 0 l - l 0 25 l 02e l@lucaNss 4 l1TYPs l1 l1 20 l1 si l@l l l car sa @

CON'T

"# "7 loill 7 8 5,'u nc60 i L hl61 0] 5l 0l 0 l 0 l 2 l 3 l7 @l 0l 2 l 1 l 3 l 8 l 2 @l0 l3 l Ol 918 l 2 l@

occxgT NUMetm 68 69 SVENT oATg 74 75 R EPoRT oATE 80 EVENT OESCRIPTION ANO PROSA8LE CONSEQUENCES Oto I o I a l lDuring routine arveillance of Reactor Water Level Switch, LIS 2-263-58B a setpoint of l g l67 inches dp was found. This is above Tech. Spec. limit (Table 3.1.1) of 66.8 inches dp. l

,,,gj gE vent was of minimal safety significance since redundant switches were operable. There l

,g,3, ,was no effect on public health or safety. Last previous occurrence reported by R.O. 81-22,

, , , , , ;on Docket 50-249. ,

10171 l I l o is i l l 7 g g 60 SYSTEM CAUSS CAusE COMP. VAtyg coce caos suscooE CoMPoNSNT CooE sVSCooE SUSCooE le191 l I l A_j @ l El@ l E l@ l I l N l S l T lR lU l@ l S l@ l Zl @

7 8 9 to 11 12 13 18 19 20

_ SEQUENTIAL oCCU.RENCE REPORT REvlsioN LER EV ENT YEAR REPonT No. Coo $ TYPE No.

O asg/Ro su  ; I812l 21 l_l l 0l 0; 7; l-l l0 l3 l l Ll l __l l 0; 22 23 24 28 27 23 29 30 31 32 N oN oP NT W hours s e iTT Pom 8. s ut WA PA R$R LLj@lz 23 34 l@ l z l@

3S Izl@ l01010101 Ln_J@ l v i@ INI@ l vi 0101 sl@

JS 37 40 41 42 4A 43 47 CAust OESCRIPTION AND CORRECTIVE ACTIONS @

lilol khe cause was attributable to instrument setooint drift. The switch was inspected with I

[il: l po problems noted. The switch was promptly adjusted to 62.8 inches dp and verified for I l repeatability. DIS 500-2 will continue to be done monthly. l l i l 31 l l l i 141 l I I 7 s a

1. ao si"EuY sPowsm oTNemsTATus @$iEoEsky' oiscovemy caseniPrioN l l1 l5 l l El@ l0 l9 l3i2l@ln N/A l lBl@l I'nstrumentSurveillance@ l 7

ag i 44 as as so l cataAsso oP netaASs LocArtoN o,P RELEASE @

llt l6* l* l Zl @

]gl AMouNTcP N/A AcTiviTv l @ N/A l l eensoNNet exPosuEss Nupean TvPe

lil711 01 I l@lZi@loescMIPTToN @ N/A l l' ' ' ,.asoNN.'L%u'llis

g,l3gl0"['%"0gl""*""" N/A l

7 4 3 11 12 80 Loss TYPE oP om cAMAGE TO PActuTv Q oEsCRIPT1oN v

'l1 l 9* l 'l Z lhl l

8*

7 e2e2a'goen 820%oa g ~ac usE ONLT .

I:1o PDR a/ A .

7 O . s, I llll 1lll !IIIlI t

58 69 80 3 NAME OF PREPARER PHONE:

~

DEVIATION REPORT Commonwealth E_ son ova "o. 12 - 2 12

. STA UNIT YEAR No.

PART 1 l T I TL E O F DEVI A TION Rx Vessel Low Water Level Scram OCCURRED Switch Setpoint Above 66.8" dp 2-13-82 1100 DATE Tivr SYSTEM AFFECTED PLANT STATUS AT TIME OF EVENT TESTING Vessel 260 in c e r,,~ n e, r un o og Run , p ,gu,73 2374.25 to,o,u,g, 780.77 G O vEs Nn OLSCRiPriON OF EVENT Found LIS 2-263-58B to trip at 67 inches dp increasing. Tech. Specs. less than or equal to 66.8 in. dp. Tested several times with trip occurring in the range of 64.2 to 64.5 inches dp. I.M. limit is 63 I 1 inches dp water column. Adjusted LIS 2-263-58B to trip at 62.8 inches dp increasing and verified repeatability. Instrument Maintenance D::partment setpoint drift work sheet (DIP 010-8) completed.

10 CFR50. 72 NRC RED PHONE d O

NOTIFIC Ail 0N MADE YES NO EQulPMENT FAtLURE N/A OYFS = NO Aoax ReOuFST No. RFsPONSiRtr si,PFPvlSoR Ma W""W cATE MFM P ART 2 l OPER ATING ENGINEER'S COPfdENTS LIS 2-263-57 A and B, and LIS 2-263-58A were found to be within calibration limits. LIS 2-263-58B was immediately recalibrated, and its setpoint verified to be within Tech. Spec. limits.

O EvENr Or eusC INTEaEST O 2 4-HOUR NRC NOTI F I C ATI ON REQ'O TELEPH

• E TECH. SPEC. VIOLATION REGION III DATE flME O NON REPOR TABLE OCCURRENCE TELECM/ TEL ECOPY O I A oAv REPoaTA8'E'T.S. aEoioN l'i oATE TIME 30 DAY REPOR TABLE / T. S. 6. 6. B . 2. a

] ANNUAL /SPECL REPORT REQ'O IF ABOVE NOTIFICATION l$ PER 10CFR21 A.I.R. .

5-DAY WRITTEN REPORT REQ'O PER 10CFR21 L.E.R. 82-07/03L-0 7g pg F. A. Palmer 2-16-82 1520 Ceco CORPCRATE OFFICER DATE TIME PRELIMINARY REPORT John M. Almer 2-16-82 COMPLETED AND REV I E AED  ;, ,

INkESTIGATED REPORT & RESOLUTION Q D A ACCEPTED BY STATION REviE4 \' O hwW O F- - - m _

(

U 3lAylg.g., , / 3 /q /gL

[,0 hW REsotufics APaROVED AND

• AutHcRIZED FOR DISTRieUTION

...o. u m , ,. n . , i ,o.., ATig SUPERINTENDENT # D/TE I