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 Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
DJS LTR 80-284 LER 80-043/03L-0
Download: ML17252B538 (3)

Text

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CommonweaaEdison

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Dresden Nuclear - r Station R.R. #1

"' Morris, Illinois 60450 Telephone 815/94?-2920 December 3, 1980 DJS LT~ /180-284 I"*

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James 9. Keppler, Regional Director tu  ;;rJ.-;';

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U.S. Nµclear Regulatory Commission zz---

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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 speci-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 Enclo~ure cc:

I Director of Inspection & Enforcement I

pirector of Management.Information & Program Control

p. S. NRC, Document Mgt. Branch iFile/NRC A0 11~ \ '

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DEC121J1)4

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, *.* ~1. ~I Lll~SEE EVE,::::::::.oR TYPE ALL REouoRED 1NFORMAT10N1 co"il'rR,oLaLocK, I.... - - ' -I- - - I' " _.......__.___....._6 \.:J.

!ills 7

I i I LI n I RI s I 2 l@I o l*o I- Io lo lo* lo 9 LICENSEE' COOE . 14' 15.* LICENSE NUMBER.

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' 25 26.'

11 11 11 101

• I I LICENSE TYPE JO 57 CAT .58. ' '

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~~~i t_;:J©I 01s10*10 10 1213 60

• 61 DOCKET NUMBER .

11 10111111131s1o1©1112 10 JS JB 10 I@

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 L

!TI[]. switch

• 2-503D'. was found to. have 1

a trip. point of 22. 35* inches Hg*. This*is below*the I.

[]JIJ 1 Tech Spec (Tab*le 3: 1.1) limit. of greater than or equal to: 23 in. Hg. This event*was I

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• of minimal sa~ety significance since the other three vacuum switches were capable of 1

!TI[]. !performing th~ir required safety function. This is the first occurrence of this. type at Dresden.

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7 8. 9 80 SYSTEM . , CAUSE. CAUSE COMP. VALVE CODE . CODE SUBCOOE, COMPONENT CODE SUBCOOE* suBCOOE

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7 8 I r1 Aj@ L:J@L:J@ I r1 NI s IT IR 1u I@ L..:J@ L.:J @.

9 10 . 11 12 1J 18 19 20 -

' SEQUENTIAL OCCURRENCE REPORT REVISION:

(.':;\ LEA/RO CVENT.YEAA:* REPORT NO. coos TYPE NO.

\:.:J ~~~~~~ I a, I 0 21 . 22 L I 23 I I 24 0 I 4I 3I 26 I..,.... L 27 I 0 13 2B l9 I ~

JO I. I 31 L..~..J 32

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ACT10N FUTURE EFFECT

• SHUTDOWN . ~ ATTACHMENT NPR04* PRIME COMP. COMPONENT TAKEN ACTION *' ... 'ON PLANT . METHOD * . HOURS 22 . . SUBMITTED FOAM :>UB. SUPPLJ.EA M~NUFACT~AE'9 .

0 0

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• 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_._*--+.,.....-----------------------------------------------------------------'

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7 8 9 FACILITY STATUS  % POWER OTHl;R STATUS l3c)\ . METHOD OF

\::;:J * . DISCOVERY

. . DISCOVERY .Q.ESCAIPTION 32 80.

!III] L:J@ Io I 4 I 7 l@)I .. NI A  !' ~@ I...___M_o_n_t_h_l_y_s_u_rv_e_:u._.L_a_n_c_e_ _ _ _ _ _~

7. a 9 10  : 12 11 44 45 46 80 ACTIVITY' CONTENT' ~

RELEASED OF RELcASE I AMOUNT OF ACTIVITY  :

r*

LOCATION OF RELEASE*@

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7 B *9* 10 11 NA * *

44. 46 N/A PERSONNEL EXPCSURES. , r.::;\

~UM~ER O (.;":;\:TYPE

[IE] 1* I I DESCRIPTION

~0~~------N_l A-..,..._ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ___, __

a g . 11 12 13

• so PERSONNEL INJURIES . (,;'";\

NUMBER DESCRIPTION~

~7,* I Oj 01*01@~*-..,...--..,...--N-/_A_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _~---~

79 9 11 12' LOSS OF OR OAMA9E TO FACI LJTY ~3 .

!30 TYPE DESCRIPTION I '

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9 10

' ' A 80 PUBLICITY . ' C\ NRC USE ONLY rn l.EJ6 * *..

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68 I I I l I 1'11*1 I I I

'59 If 80*;;;

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DEVIATION REPORl .9

,;** .* 'commo*nweatth* Edison*

'W . STA* UNff YEAR. NO; D.~ 12 - 2 ~so. - .73 OCCURRED*

it 2 Condenser* Low Vacuum Switch Below.Tech. s'pec. Limit 11-u:...so. 110.0 DATE TIME c SYSTEM AFFECTED *500 PLANT CONDITIONS . TESTING Reactor Protection System .Run 1207 366 C:Xl .CI MODE PWR MWT) LOAD MW-E). YES NO DESCRIPTION OF* EVENT.

Pressure switch 2-'503D as found'*set point of 22.85.inches.Hg; vacuum is belo~ 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. WR* NO. A. R'.

• Zapatocky 11-13,..so FAILURE' DD NO 1n:SPriNSIBLE SUPERVISOR* DATE PART 2 I OPERATING ENGINEERS COMMENTS

. Kema1ning three switches were capable of performing_ the* required safety function.

SAFEn'-. * :1

. TYPE OF~ DEVl:A'Tl ON:* .. EVENT* OF*. POTENT.I AL .. **TECH" *SPEC.: NON*- REPORTABLE. ANNUAL RELATED

~

REPORTABLE :OCCURRENCE'-**. :

• PUBL'f C' INTEREST'. VI OlATl ON***. OCCURRENCE. REPO'RTI NG. WR ISSUED .

D D t0'CFR2.1 *YES .

0 YES D'

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14. DAY 30 DAY o"*O!,'~F~S~TI

.6 . . ~a ON D o* D NO D NO w .

. REPORTABLE. CCCURR~NCE ACT.I ON ITEM NO.* PROMPT ON-SITE NOTIFICATICN NUMBER I R, -M. *Ragan 11/17/80 . 11:00 Tl TLE DATE TIME

~- 80-43/031-0',.  ; .. ..

/* Tl TLE DATE TIME '

24--HOURi NRC NOTIFICATION PROMPT .OFF- SITE NOTIFfCATION o*T?H N/A N/ fEGl,ON I I I DATE TIME F. A, Palmer Tl TLE 11/17/80 DATE 3:35 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

• . ..11/17

- /80 REV! EW ANO. COMPLETED DATE ACCEPTANCE BY: STATlON REVIEW -

AS REOU I RED .

DATE*

RESOLUTION. APPROVED ANO

• I;L- IO-?fJ AUTHOR I ZED FOR* DI STR I BUTI ON DATE