ML20150C712

LER#78-091/03L-0 on 780914: Damper Switching Sequence from Normal to Accident Mode Caused Pressure Differential in 1B Rcfc.Pressure Differential Caused Accident Inlet Damper Blades to Flex & Bend.Switching Sequence to Be Changed

ML20150C712
Person / Time
Site:	Zion File:ZionSolutions icon.png
Issue date:	10/13/1978
From:	Rachel Johnson COMMONWEALTH EDISON CO.
To:
Shared Package
ML20150C710	List: ML20150C708 ML20150C712
References
LER-78-091-03L, LER-78-91-3L, NUDOCS 7811240201
Download: ML20150C712 (1)

Text

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[o L1] } Followina reactor tri.p_fI.pmR% power and inadvertant SI . 1B RCFC a c ci dei) t )

g_] l inlet damper failed to shif t. lA RCFC was DOS and 1C RCFC fai.ted to aut4 l

Lolij l s. tar t . See LER 5 0-2 9 5 /7 8-9 3. Te ch Spe c 3. 5.1. C req ui res a minimum of.3_J )

l o l b l [RCFCs be operable , or the reactor shutdown. Since the reactor was al- l FlB l ready shutdown, with 3 containment spray pumps available , and 1C RCFC _J  ;

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J  !!D Ju J/ 40 41 47 43 44 CAUSC DESCRIPTION AND CORRECitVE ACTIONS h l1 l o I [ Damper switchinc secuence from normal to accident mode caused prer'3 nre _]

I i I i _l I di f fe rential in IB RCFC. This oro ns ure_ di f fo ronti a l o n nnn el n H eMn t I i, ; , j ; inlet damper blades to flex and bind. Switching secuence of the dampers _J i3 l3; l will be changed during re fueling outage , eliminating pressure di f fe ren- t ii ig [ tial and damper binding problems . No further action is req ui re d . ]

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NAUF OF PHEPAHEH. Robert Johnson ,,u o n i 312-746-2084 p l