ML20009D806

LER 81-014/03L-0:on 810616,during Scram Air Sys Header Pressure Switch Calibr,Pressure Switches 3-302-99A & B Actuated W/Setpoint Lower than Required.Caused by Instrument Setpoint Drift.Switches Reset

ML20009D806
Person / Time
Site:	Dresden
Issue date:	07/09/1981
From:	Mancini B COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009D795	List: ML20009D794 ML20009D806
References
LER-81-014-03L-02, LER-81-14-3L-2, NUDOCS 8107240366
Download: ML20009D806 (2)

Text

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NAC FORM 364 - - ----- - - - - - - - - - - - - - - - - - -- -- U.S NUcteEAR R1GULATORY COMMISSION nm~

LICENSEE EVENT REPORT s4NTROL 8 LOCK: l i

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.h l (P' EASE PRINT OR TYPE ALL REQUIREO INFORMATIO*H o lil lI l Ll'Dl Rl S j 3 l@l 0 l 0 l - l 0 l 0 l 0 l0 l0 l - l 0 l 0 l@l 4 l 1 l 1 l 1 l 1 l@l l l 8 9 UCENSEE CCOE I4 15 uCENSE NumeER 25 26 LICENSE TvrE JO '7 CAT 68 @

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i 8 DOCKET NUMSER 68 69 DATE 14 75 REPCRT DATE EVENT DESCRIPTION AND PROSASLE CONSEQUENCES Io l2l l While performing Scram Air System He r Pressure Switch Calibration, found pressure g ; switch 3-302-99A actuated at 47 psig decreasing and pressure switch 3-302-993 actuated g o 14 ; l at 49 psig decreasing. Setpoint should be greater than 50+- 2 psig decreasing Minimal [

g g safety implication since system was still functional, although in a slightly degraded condition. No effect on public health or safety. This was the first occurrence IJU,w, a ; j

,o,  ; at Dresden. ,

NI I 7 89 80 SoE" Yo'oY sun $$$ COMPONENT CODE $ 5 :CO'E $ l06 Q

7 8 lI lA l@ W@ l E l@ l Il Nl S l T l R l U l@ lS l@ { @

9 to 11 12 13 18 19 20 SEQUENTIAL oCOUR RENCE REPCRT REVI$f0N LER EVENT YEAR REPORT No. CODE TYPE o.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h g1 gagj The cause is attributable to instrument sey sint drift. To prevent reoccurrance, the g l pressure switches were reset to trip at 53 psig decreasing and repearchility was ,

verified. The switches will be tested quarterly per DIS 300-1.

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Y 8 9 90 I A  % POWER CTHER STATUS 01 RY DISCOVERY CESCRIPTioN N/A l C lgl Maintenance Test j L.i._L5 ! Ls J@ l 1917 I@l l l j,y,,,, cgg,,,, i2 n = 4 . .0

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11 PERSONNEL EXPCSURES NUMSER TYPE CESCRIPTICN N/A 1117 l l 0l 0 l 0 l@l Z l@l l PERsoNNEt iN3u'Rits NUMSER CESCRIPT:CN ,

ia l0l0l0lgl N/A l 7 8 9 11 12 30 LCSS OF CR CAMAGE TO PACluTY TYPE DESCRIPTION l 1 19 l [Zj@l N l . ._

7 8 9 10 8107240366 810710 80 issut oNCRiPncs@ . PDR ADOCK 05000249 NRC USE CNLY ,

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'/ (s> DEVIATION REPORT

. DV R NO.

Commonwealth Edison STA UNIT YEAR NO.

8 3 33 PART 11 TI TLE OF CEVI ATION OCCU RRED Unit 3 Scram Air System Header Pressure Switch Below Limits 6/16/S1 1700 l ggg 7, y g SYSTEM AFFECTED 300 PLANT CONDITIONS TESilNG Control Rod Drive Run 2440.06 788.29 MODE PwRfMwT) . LOAD (MWE) YES NO DESCRIPilON OF EVENT While doing Scram Air System Header Presquie Switch Calibration, SOP 8-15-58, found PS-3-302-99A

_,to trio (contacts closeTat 47 osig decreasiing and PS 3-302-99B to trip (contacts close) at

+

49 osig decreasing. Setpoint should be greater than 50 _ 2 psig decreasing.

DESCRIPTIC,N OF CAUSE

-~0THER APPLICABLE I N FO RMAll 0N Prse:ure switches are reset to trip at 53 psig decreasing and reset at 54.5 psig increasing.

R:ptctability was verified.

EQUIPMENT YES DR NO. WR NO.

FAILURE

@ NO N/A N/A oENONSIBLE SUPERVISOR DATE PART 2 l OPERATING ENGINEERS COMMENTS m n n e e,,vo cut ec%e ua-n 4.m adhrelv resor and tested to verifv repeatability.

SAFETY-TYPE OF CEVIATION EVENT OF POTENTIAL TECH SPEC NON-REPORTABLE ANNUAL RELATED REPORTABLE 0] URRENCE PUBLIC INTEREST VIOLATION OCCURRENCE REPORTING WR ISSUED 10CFR21 YES 14 DAY _ YESh 30 DAY [Ih0N _ _

NO W X REPORTABLE CCCURRENCE ACTION ITEM NO. PROMPT ON-SI TE NOTI FICATION NUMBER R. M. Ragan 6/18/81 1300 Xu- 81 -14/03L-0 TlTLE CATE TIME TITLE CATE TIME 24-HOUR NRC NOTIFICATION PRCMPT OFF-SITE NOTI FICATION

[ TPH T. Tongue 6/18/81 1000 F. Palmer 6/18/81 1445

[ REGION Ii1 DATE TIME Tl TL E DATE TIME TGM REGION III & COL [' ATE TIME TITLE DATE TIME RESPONSI ELE COMP ANY O FFI CER INFORMED OF 10C F R21 COMDIT!ONS AND THEIA DEPO AT TO NPC

• TITLE DATE invt REV1 EW AND CCMPLETED Michael J. Wright 6/18/81 OP ERALI NG ENGI Nf tH, DATE CEP A BY STATION REVIEW q, g , &

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DATE --

RESOLUTION APPROVEC AND ,' 87.AA u /

AUTHORIZED FOR ClSTRIBUTION STATIQN pPERINTENDENT D' ATE

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