View source for PNO-V-85-088, on 851216,ventilation Fan in Train a balance- of-plant ESFAS Auxiliary Relay Cabinet Tripped Off & Caused Cabinet to Overheat.Trip Resulted in Logic Cards Malfunctioning.Licensee Actions Under Review

{{Adams
| number = ML20138N987
| issue date = 12/17/1985
| title = PNO-V-85-088:on 851216,ventilation Fan in Train a balance- of-plant ESFAS Auxiliary Relay Cabinet Tripped Off & Caused Cabinet to Overheat.Trip Resulted in Logic Cards Malfunctioning.Licensee Actions Under Review
| author name = Miller L, Zimmerman R
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION V)
| addressee name = 
| addressee affiliation = 
| docket = 05000528
| license number = 
| contact person = 
| document report number = PNO-V-85-088, PNO-V-85-88, NUDOCS 8512240239
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
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i sw PRELIMINARY NOTIFICATION-0F EVENT.OR UNUSUAL' OCCURRENCE--PNO-V-85-88                                                                                 Date:    12/17/85
         ' TThis preliminary;notificationkconstitutes EARLY notice of POSSIBLE' safety'or public interest                                 ~
       -            leignificancel]The'information presented <is as initially rec'ived                                                                               e      without verification or-
                    /cycluationland-isbasically.._all.that-isknownby'RegionVstaffonthis-date.                                                       2 xc .                       ,
FACILITY: AEiitons" Nuclear Power Project EmergencysClassification 1Palo Verde Unit 1?
                                                                                                                    ^'
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DNotification'of Unusual Event:
s l Docket Nosh 50-528I                                                                                  : Alert Site Area Emergency
: r.                                              +
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                                                                                                                                          ,              General Emergency                                ..I s                                    >
X Not Applicable-iSUBJECTs LI'NADVERTENT ENGINEERED SAFETY. FEATURES ACTUATION AND SUBSEQUENT W                                                1 REACTOR' TRIP.-       -
                                 . w             . - - +: ..                                      . ..                 .    ..                                                             ,
j 0ncDecemberE16,X1985,x _.atJapproximatelyl6:12 PM MST, a ventilation fan in the "A" Train 1
g Bil nce. of } P.lant Engineered: Safety ' Features Actuation System (BOPL ESFAS)l auxiliary -
This apparently resulted'
(' j<r:1?yicabinetltripped off and caused the cabinet to-overheat.ipcheiBOP!                                                                    ^
ESFAS ' logic' c "A"- BOP; ESFAS systems.
% aThissincluded theilossiofipower sequencer which tripped open the~ normal" feeder
? ibr5t.ker tofthe Class:IE'4160.V Bus S03,Edeenergizing the bus and shedding its' electrical.             .
            *Tioads'.5The/A" Dies'elCeneratorstarted;however',the;outputbreakerdidnotcloseand y JrOtnergizeitt.e bus W Manual attemptsLto;reenergize yhe: loads lon the S03 bus.were' unsuccessful fsntilithalloss of power:loadeshed, signal'was removed bi pulling fuses'in the B0P ESFASL s
             .      ; c-bitiet.O During. this : event:ithe t"B" Essential-- Chiller tripped 'on low refrigerant: temperature. -
J With: the t''A" Diesel Generator. and the :"B" Essential' Chiller declared , inoperable, a. reactor -
3hutfdown was commenced from150%. power in-accordance with' Technical Specifications.. At:
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(cpproximately3 11_:30-PM, with                                                       f reactor power at.approximately 2%,-the control room operator was:
           , M un bleitoimaint'ain._feedwater? flow to;both steam generators with the running' main;feedwater-Jpump.f The main; feed pump:was manually. tripped, andlthe nonessential auxiliary feedwater-pump.                                                                                         j ivat started k. Malfunctioning Control Room indicationsLon motor / amperage and:pumpiflow caused.                                                                                        "
(the' operator:to trip the nonessential AFW pump and start the essential
                                                                                                                                                  ~                             ~
   .                                                                                                                                                                              "B" AFW pump..-Steam:.      l
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sgin6rator wide range level wasiapproximately;50% when the "B"'AFW pump.was started;?however,-                                             -
                   ?whta thefsteam generators were. fed with cold feedwaterlit apparently caused the'waterilevel to
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p , khrinki below' thel44%; wide: range reactor (tripfset point; and the' reactor tripped on low #1: steam-ig"n:ratorf evel;                                 The unit'is currently ~in Mode: 3 with the~ licensee evaluating the identified.
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   ,7 Ecomponent; problems.' TheEresident. inspector'is reviewing.the licensee's actions..                                                                                                                    i
              +'Th[licenseehasnotified1'ocal'                                                                  media.>
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n Thio !information 'is ' current: as - of 10:45AM (MST) December 17,-1985.
bCONTACT: 1. Miller, 'Jr.,                                                                                     R. Zimmerman                                                                        l
                                                 'FTS:463-3869' x                                                        -(602):386-5260                          ..      .
85122'0239     4          851217         6                                   l
: DISTRIBUTION '                                                                                              PDR- 18cE PNO--V-85-088                   PDR      R r
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                   ! Chairman Palladino E70                                                                   .NRR                          IE.            NMSS-                         ADM:DMB        .
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            ,!Comm;;Zech?.                                                                                                                  OIA,                                         DOT:Trans Only P. .                                                                     RES'                                              )
Comm. Bernthali                                        - MrA_                                                  :AEOD                                                                 l
           ^ ;'Comm. Roberts =                                                    ELD-Comm.}Asselstine                     '
Regions:                                                                -
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(Reactor Licensees)                                 REGION V: FORM 211               O l 4 PDR.:-                                                                                  tResident Inspector _            .
(Revised 3/14/83)            '>
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