ML20147A894

/03L on 780817:room Cooler Fans Failed to Start When Pumps 3B & 3C started.4KV Switchgear 33 & 34 Auxiliary Contacts Were Found Dirty.(Encl to 7809220129)

ML20147A894
Person / Time
Site:	Dresden
Issue date:	09/08/1978
From:	Rullo COMMONWEALTH EDISON CO.
To:
References
LER-78-032-03L, LER-78-32-3L, NUDOCS 7809220135
Download: ML20147A894 (2)

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o 1 5$n$ l Ll@l 0l 5l 0l 0 l 0 l 2l 468j 9 69l@l EVENT 0 l 8DATEl 1 l 7)* I ~7 I 8REPORT 75 '@lDATE 0 80 60 61 DOCK ET NUMBER v 8 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h l (DOS l 1 o 12 l l During containment cooling service water (CCSW) pump operability surve d This Event g g o g a g l 1500-3), roem cooler fans f ailed to start when pumps 3B and 3C starte .

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[O l4 j l had minimal safety significance since f ans could have been started manually l

No previous occurrences of this type.

101sl l prevent pump overheating. 1 10161l l 10171 I J

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[,Y_J @ 44 47 di 43 40 33 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h The contacts were  ;

gj o ; ) 4KV switchgear 33 and 34 auxiliary contacts were found After aux contact dirty. j One week later the cooler fans failed to start again.

l i t i j [ cleaned.

f ily. l g,;7gl operating mechanism was adjusted, cholers tested satis actor

_l IIl3l l J 80 11 14 I l 7 8 9 DISCOVERY DESCRIPTION OTH ER ST ATUS iSCO FY l

% POWER ST S NA l l B l@l Surveillance Testing

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NUMBER NA 80 t a 8 0

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LOSS Of OR DAM AGE TO F ACILITY ' j TYPE DESCHiPTION NA 80 i 9 ] @l NRC USE ONLY 7 8 9 .to PUBLICITY "c"'"' " 7 9 e /2 2 o n5 i !i,,,,,,,,iil:;

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ATTACHMENT TO LICENSEE EVENT REPORT 78-032/03L-0 COMMONWEALTil EDISON COMPANY (CWE) l DRESDEN UNIT -3 (ILDRS-3) l DOCKET # 050-249 During a containment cooling service water (CCSW) pump operability surveillance (DOS 1500-3), theThe room cooler f ans f ailed to start when tsas could, however, have been op-pumps 3B and 3C were started.

erated manually from the local panel if required to prevent the pumps from overheating. There have been no previous occurrences of this type at Dresden. The 4KV switchgear 33 and.34 auxiliary contacts were Jumpers were dirty and appeared not to be making proper contact.

placed on switchgear 34 CCSW pump 3C auxiliary contacts and switchgear The 33 CCSW pump 3B auxiliary contacts enabling all eight f ans to run.

One week later, the cooler contacts were cleaned and put back in service.

fans failed to start again when CCSW 3B pump was started. It was then determined that the auxiliary contact operating mechanism needed adjust-ment. After this adjustment, the room cooler fans were operating properly.

This misalignment was apparently the cause of the room cooler fan failures in both cases.

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