ML17252B494

LER 78-045/03L-0 for Dresden, Unit 2 Re While Performing Monthly Surv. Dis 1400-3, Auto Blow-down Permissive Sw. Ps 2-1430-1466D Tripped at 120 Psig

ML17252B494
Person / Time
Site:	Dresden
Issue date:	08/25/1978
From:	Stephenson B Commonwealth Edison Co
To:	James Keppler NRC/RGN-III
References
BBS LTR 78-1186 LER 78-045/03L-0
Download: ML17252B494 (2)

Text

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,, Commom.lth Edison Dresden Nuc, R.R. #1 Power Station Morris, Illinois 60450 Telephone 815/942-2920 C)  ;

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August 2.), 1978 BBS Ltr. #78-1186 James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report #78-045/031-0, Docket #050-237 is hereby submitted to your office in accordance-with Dresden Nuclear Power Station Technical Specification 6.6.B.2.(a), reactor protection system or engineered safety feature instrument settings which are found to be less conservative than those established by the technical specifications but which do not prevent the fulfillment of the functional requirements of affected systems.

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~~ ten e Station uperirrtendent Dresden Nuclear Power Station BBS/deb Enclosure CC: Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC

NR~ r::.;;M366 U.S. NUCLEAR REGULATORY COMMISSION (7-171

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LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFOFIMATION) 6

~I II LI DI RI sl 2IG)I ol ol -I ol ol 01oIo1-1oIoIG)l4 I l I l I l I 1101 I 10 7 B 9 LICENSEE coo'E 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 C1H 58 CON'T fil1J  :~:~~~ L!!J©I 01 sl 01 01 01 21 31710101s10111 71 B'(DIO! s121 s111 sJG) 7 B 60 61 DOCKET NUMBER 68 69 EVENT DATE i<. 75 HEPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES {iO)

I While performing monthly surv. DIS 14'00-3, Auto Blowdown permissive sw. PS 2-lli30-146§D

[QTIJ I tripped at 120 psig. Tech Spec Table 3.2.2 requires trip between SO and 100 psig.

Dresden setpt.is* 9S +/- 5 psig. Safety significance minimal since redundant

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[Q]}] switches were operable and would have provided permissive signal at 94. 0 psig. Simi- I IT:TIJ lar event ref. in Docket f!OS0-237, LER ff 18-031/03L-0 ..

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[Iill 8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUB CODE SUBCODE

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7 9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION REPORT NO. CODE TYPE NO.

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~ REPORT NUMBER I 7I 8I l.::::J I o I 4 I sI I /I Io I 3 I LI:__j l.=J 21 22 23 24 26 27 28 29 30 Jl 32.

ACTION TAKEN FUTURE ACTION EFFECT ON PLANT SHUTDOWN METHOD HOURS r:::::..

\Z3J ATTACH~1iENT SUBMITTED NPRD-4 FORM :;us.

. PRIME COMP. CO!*~~PONENT MANUFACTURER SUPPLIER lli.J@LJJ@ LJJ@ . UJ I o I oI oI o J Lli.J@ t]U@ l2U@ *" I s I 3 I 8 I 247I@

JJ 34 35 36 37 40 41 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

I Cause was a sticky actuator on the switch .. Actuator was cleaned. Switch was reset to trip at 94.8 psig increasing and repeatability verified. The Core Spray Pump Auto Blowdown Permissive Pressure Switches will continue to be tested monthly using DIS 1400-3. No further corrective action deemed necessary at this ti.me.

DJJJ 7 B 9 FACILITY STATUS  % POWER OTHER STATUS (iQ\

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METHOD OF DISCOVERY DISCOVERY DESCRIPTION 32 80

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[iJIJ W@ W@1-I__:N=A=----------1 NA B 9 10 PERSONNEL EXPOSURES 11 r:::;;.,

44 45 80 NUMBER f-:;\ TYPE DESCRIPTION

[Q2J I 0 I 0 I 010~@.______N_A_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ . 1 8 9 11 12 13 60 PERSONNEL INJURIES (;';\

NUMBER DESCRIPTION6

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~12-------.,---------------------------------8Jo LOSS OF OR DAMAGE TO FACILITY 0 TYPE DESCRIPTION ~

~UJ@ 8 9 ~10--------------------------------~---------8~0 NA PUBLICITY Q\

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Carl Lindberg f").r- ?,P;::PAC"U=O - - - - - - - - - " ' ' - . - - - . . . . - - - --*...-.

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