ML20027A205

LER#78-053/03L-0 on 780926:Equip Attendent Noted Main Steam Line Flow Switch 261-2D Was Valved Out Due to Unknown Cause. Event Had Minimal Safety Significance & Switch Returned to Svc.Surveillance Sheets Wo Require Daily Check of Switches

ML20027A205
Person / Time
Site:	Dresden
Issue date:	10/17/1978
From:	Pullo R COMMONWEALTH EDISON CO.
To:
Shared Package
ML17173A315	List: ML17173A314 ML20027A205
References
LER-78-053-03L-01, LER-78-53-3L-1, NUDOCS 7810270236
Download: ML20027A205 (1)

Text

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4RC FL U. S. NUCLEAR REGULAT'ORY COMMISSloN

!7 77f a LICENSEE EVENT REPORT l

CONTROLBLOCK: l I

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

o lil lIl 3 9 tlLICENSEE D I RCODE l S l 214 l@!15 0 l 0 l - l 0 UCErdSE l 010NUMBER l 0 l 0 l- l 0 l 0 25l@l 264 l 1LICENSE l 1 l 1TYPE l l 1JOl@l57 CAT l@

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8 60 61 **

DOCKET NUM8ER 68 69 EVENT DATE REPORT DATE l

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h iol2l l During steady state operation an Equipmeist Attendent noted Main Steam Line (A) Flow l l .

o Ia 1 i sh tch 261-2D (1 of 16) was valved out. Event had minimal safety significance since l

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olal l all other flow switches were operable as required by Tech. Specs. There are no l 1

iO Isl l previous occurrences of this type. I O 16 l l l 7  !

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'$8i l SYSTE*A CAUSE CAUSE COMP. VALVE CODE CODE SUSCODE COMPONENT CODE SUSCODE SUBCODE 3191 4 ,

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9 10 11 12 13 tis 19 20 y SEO' ANTI AL OCCURRENCE' REPORT REVISION tcRJAO j EVENT YEAR REPORT NO. CODE TYPE No.

@ AEPO9T l 71 81 l-i l 01 51 3l l/l l 0131 lLl l-l l Ol

_.21 22  :: 24 . ats 07 ,

28 23 30 31 32 i ~' K AC O O PLANT ME H HOURS 2 SB i FO t 8. SU PL MA UFACTURER

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CAUSE DESCRIPTION ND CORRECTIVE ACTIONS itoll Cause for switch isolatioa unknown. Switch returned to service. Surveillance l i

2, ll DIS 250-1 for svitches done 9/16/78, and checklist indicates switch returned to I i .

,il2I I service. Switch operation also not recorded as required by Equipment Attendant. l 4 iI3I I Control room surveillance sheets will be revised to include a daily check of these l*

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ig l l switches and require a supervisory review. l 7 8 9 1 80 ST  % POWER OTHER STATUS 015 O RY DISCOVERY CESCRIPTION 151 l E l@ l O! 918 l@l NA l l B l@l Operating Surveillance l ACTIVITY CO TENT RELEASE AMOUNT OF ACTIVtTY LOCATION OF RELEASE 16a 9l W @D OF RELEASED @l NA l l NA l 10 11 A4 45 . 80 PERSONNEL EXPOSURES NUMSER TYPE DESCRIPTION l i l 7 ] l 0 l' 0 l 0 '

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~' LCSSoF C4 OAMAGE TO FActuTY l TYTE DESCRIPTtCN lTi]I2l@l 8 .9 10 NA 80 l

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