ML17252B538

LER 80-043/03L-0 for Dresden, Unit 2 Re Surveillance Testing of the Condenser Low Vacuum Switches, Pressure Switch 2-503D Was Found to Have a Trip Point of 22.85 Inches Hg

ML17252B538
Person / Time
Site:	Dresden
Issue date:	12/03/1980
From:	Scott D J Commonwealth Edison Co
To:	Keppler J G NRC/RGN-III
References
DJS LTR 80-284 LER 80-043/03L-0
Download: ML17252B538 (3)

Text

-* / . ,. ". "' I CommonweaaEdison Dresden Nuclear -r Station R.R. #1 Morris, Illinois 60450 Telephone 815/94?-2920

'V December 3, 1980 DJS /180-284 James 9. Keppler, Regional Director Directprate of Regulatory Operations U.S. Nµclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 -Region III v> tu .:::: -VI >o_.,. zz---

l:rri :::0 < (") : ° ' ,.,, ._(I):' C> Report'able Occurrence Report tf80-43/03L-0, .Docket 11050-237 is being-...&*

submitted to your office in accordance with Dresden Nuclear Power Statio,n Technical Specification 6.6.B.2. (a), reactor protection system or engineered safe.ty feature instrument settings which are found to be less conservative than those established by the technical fications but which do not prevent the fulfillment of the functional requirements of affected systems. D. J. Scott Station Superintendent Dresden Nuclear Power Station ' DJS:lg I cc: Director of Inspection

& Enforcement I pirector of Management.Information

& Program Control p. S. NRC, Document Mgt. Branch iFile/NRC A \' /1 " ' I"* ,.

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C:::>".J -cc:: 0 ;;;c: DEC121J1)4 i ,

• co"il'rR,oLaLocK, I. I I EVE,::::::::.oR TYPE ALL REouoRED 1NFORMAT10N1

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....... __. ___ ..... _6 \.:J. !ill I i I LI n I RI s I 2 l@I o l*o I-Io lo lo* lo 10 b Io I o IG)l 4 11 11 11 11 101

• I I 7 s 9 LICENSEE' COOE . 14' 15.* LICENSE NUMBER. ' 25 26.' LICENSE TYPE JO 57 CAT .58. ' ' i1!i t_;:J©I 01s10*10 10 1213 11 10111111131s1o1©1112 10 JS JB 10 I@ 7 8 60

• 61 DOCKET NUMBER . 68* 69 EVENT DATE . 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

• . * [IJIJ 1 nuring the monthly survei11ance testin . of the condenser low vacuum swi t.ches, *pressure This*is below*the

!TI[]. 1 switch

• 2-503D'. was found to. have a trip. point of 22. 35* inches Hg*. []JIJ 1 Tech Spec (Tab*le 3: 1.1) limit. of greater than or equal to: 23 in. Hg. This event*was

[]]]]

• 1 of minimal significance since the other three vacuum switches were capable of !TI[]. !performing required safety function.

This is the first occurrence of this. type ITIIJ [ill] at Dresden. 7 8. 9 [§TI]: 7 8 SYSTEM . , CAUSE. CAUSE COMP. CODE . CODE SUBCOOE, COMPONENT CODE SUBCOOE* I r1 Aj@ L:J@L:J@ I r1 NI s IT IR 1u I@ L..:J@ 9 10 . 11 12 1J 18 19 ' SEQUENTIAL OCCURRENCE REPORT VALVE suBCOOE L.:J @. 20 -(.':;\ LEA/RO CVENT.YEAA:*

REPORT NO. coos TYPE \:.:J I a , I 0 L I I I 0 I 4 I 3 I I ..,.... L I 0 13 I I . I 21 . 22 23 24 26 27 2B l9 JO 31 REVISION:

NO.

32 L I. I 80 e ACT10N FUTURE EFFECT

• SHUTDOWN . ATTACHMENT NPR04* PRIME COMP. TAKEN ACTION *' ... 'ON PLANT . METHOD * . HOURS 22 . . SUBMITTED FOAM :>UB. SUPPLJ.EA . Li@l.:J@'.

LtJ@ L:J I 0 I 0 I 0 I L l::J@* COMPONENT . I I 0 1* I I@ ' J3 34 JS . . JS. . 37 40

• 41 42 *

• 43 44' 47'

• CAUSE DESCRIPTION ANO CORRECTIVE ACTIONS @'. . . O:[§] I 'This* event: cair be.*.attributed.

to* .'iristrument -drift.**

'Pressure*

switch 2-503D: was reset t*o L [IJ:IJ j"trip at 23.75 inches Hg. vacuilm. The test was.repeated three times to prove operabili-1 CIIIJ l ty. This surv.eillance will continue to be perf armed monthly. No further action . I o::.I]J...,_r_e_q_u_i_*r_e_d_._*--+.,.....-----------------------------------------------------------------'

! IJJI] 7 8 9 FACILITY STATUS % POWER !III] L:J@ Io I 4 I 7 l@)I .. l3c)\ . METHOD OF

• OTHl;R STATUS \::;:J * . DISCOVERY . . DISCOVERY .Q.ESCAIPTION 32 NI A !' ... I ___ M_o_n_t_h_l_y_s_u_rv_e_:u._.L_a_n_c_e

______ 80. a 9 10 : 12 11 ACTIVITY' CONTENT' RELEASED OF RELcASE I AMOUNT OF ACTIVITY  : ITEJ .LI@ L.:JI* NA *

• r* 7 B *9* 10 11 PERSONNEL EXPCSURES. , r.::;\

O (.;":;\:TYPE DESCRIPTION

[IE] 1

• I I

__ A-..,... ___________________

__, a g . 11 12 13

• PERSONNEL INJURIES . (,;'";\ NUMBER I Oj

________________

79 9 11 12' !30 LOSS OF OR OAMA9E TO FACI LJTY . TYPE DESCRIPTION I ' IiID LJ@** ' ' A 7. 44 45 46 80 N/A LOCATION OF RELEASE*@

44. 46 so 1 a 9 10 PUBLICITY . ' C\ _..,.... . ...,. ISSUEDl,;";\DESCRIPTION ' rn l.EJ6 * *.. . . *.

80 NRC USE ONLY ' "' I I I l I 1'11*1 I I I If :1 8 9 10 ' ! 68 '59 ii.J.

80*;;;

--...........

1.A.r'----***---*-*****-*-

• • -** -*--* .. *--** ..... -***** ---@;,*** ,;* '-'* ** 'W . * .* 'commo*nweatth*

Edison* DEVIATION REPORl . 9 STA* UNff YEAR. NO; 12 -2

-.73 it 2 Condenser*

Low Vacuum Switch Below.Tech.

s'pec. Limit OCCURRED*

11-u:...so.

110.0 TIME c SYSTEM AFFECTED *500 Reactor Protection System DESCRIPTION OF* EVENT. PLANT CONDITIONS . MODE .Run PWR MWT) 1207 DATE TESTING LOAD MW-E). 366 C:Xl .CI YES NO Pressure switch 2-'503D as found'*set point of 22.85.inches.Hg; vacuum is the requried set point* of greater.than or equal to*23 inches *Hg.vacuum,set point.was checked three times and *tripped at 22.85. inches Hg*. vacuum each. time. DESCRIPTION OF CAUSE

• Set point drift .. . OTHER APPL I CABLE \J'IFORMATl ON . * . Reset switch to 23.75 Hg. vacuum* decreasing*

and checked repeatability three times w:ith no change in setpo.fnt noted. EQUIPMENT0Yes, CR NO. FAILURE' DD NO WR* NO. A. R'.

• Zapatocky 1n:SPriNSIBLE SUPERVISOR*

PART 2 I OPERATING ENGINEERS COMMENTS . Kema1ning three switches were capable of performing_

the* required safety function.

11-13,..so DATE SAFEn'-. : . TYPE DEVl:A'Tl ON:* EVENT* OF*. POTENT.I AL .. **TECH" *SPEC.: NON*-REPORTABLE.

ANNUAL RELATED * :1 .. REPORTABLE

OCCURRENCE'-**.

• PUBL'f C' INTEREST'.

VI OlATl ON***. OCCURRENCE.

REPO'RTI NG. WR ISSUED . D 14. DAY D t0'CFR2.1

• YES . 0 YES D' ; D .. o* D 30 DAY ON NO D NO w .6 .. . REPORTABLE.

ACT.I ON ITEM NO.* PROMPT ON-SITE NOTIFICATICN NUMBER I R, -M. *Ragan 11/17/80 . 11:00 -: 80-43/031-0',.

Tl TLE DATE TIME .. .. /* Tl TLE DATE TIME 24--HOURi NRC NOTIFICATION PROMPT .OFF-SITE NOTIFfCATION o*T?H N/A F. A, Palmer 11/17/80 3

35 ' N/ fEGl,ON I I I DATE TIME Tl TLE DATE TIME o*TG'A. REGION I I I & OOL CATE TIME Tl TLE DATE TIME . ' RESPONSIBLE.

COMPANY OFFICER INFORMED OF IOCFR21 ,. CONDITIONS ANO THEIR REPORT TO NRC

• DATE f I ME c REV! EW ANO. COMPLETED ACCEPTANCE BY: STATlON REVIEW AS REOU I RED . DATE* RESOLUTION.

APPROVED ANO AUTHOR I ZED FOR* DI STR I BUTI ON *. 11/17 /80 .. --DATE

• I ;L-IO-?fJ DATE -<