05000237/LER-1978-053-03, /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 Swit

/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: 05000237/LER-1978-053, Forwards LER 78-053/03L-0 05000237/LER-1978-053-03, /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 Swit
References
LER-78-053-03L-01, LER-78-53-3L-1, NUDOCS 7810270236
Download: ML20027A205 (1)

LER-1978-053, /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

Event date:
Report date:
2371978053R03 - NRC Website

text

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.a 4RC FL U. S. NUCLEAR REGULAT' RY COMMISSloN O

!7 77f a LICENSEE EVENT REPORT l

CONTROLBLOCK: l l

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lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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3 9 LICENSEE CODE 14 15 UCErdSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 CON'T. '

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DOCKET NUM8ER 68 69 EVENT DATE 74 75 REPORT DATE 80 8

l 60 61 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.

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CAUSE

CAUSE COMP.

VALVE CODE CODE SUSCODE COMPONENT CODE SUSCODE SUBCODE l Cl Dl@ l A l@ lC l@ l Il Nl Sl Tl Rl Ul@ W@ W @

3191 4

9 10 11 12 13 tis 19 20 SEO' ANTI AL OCCURRENCE' REPORT REVISION y

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

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

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,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.

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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 16 l W @D OF RELEASED @l RELEASE AMOUNT OF ACTIVtTY LOCATION OF RELEASE NA l

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a 9 10 11 A4 45 80 PERSONNEL EXPOSURES NUMSER TYPE

DESCRIPTION

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,iRSON ~ E t',~2uLS oESCRipnON@

NUMuR lalIOl0lOl@l NA l

i 8 9 11 12 80

~' LCSSoF C4 OAMAGE TO FActuTY l

TYTE DESCRIPTtCN lTi]I2l@l NA l

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