View source for 05000281/LER-1975-005, Updated LER 75-05/010:on 750225,radial Trip of Max 2.5% Existed.Caused by Prolonged Recovery of Rod F-2.Control Room Alarm Did Not Function Due to Defective Circuit Card. Card Replaced & Staff Cautioned

{{Adams
| number = ML20086Q742
| issue date = 04/08/1975
| title = Updated LER 75-05/010:on 750225,radial Trip of Max 2.5% Existed.Caused by Prolonged Recovery of Rod F-2.Control Room Alarm Did Not Function Due to Defective Circuit Card. Card Replaced & Staff Cautioned
| author name = Baucom T, Stallings C
| author affiliation = VIRGINIA POWER (VIRGINIA ELECTRIC &amp; POWER CO.)
| addressee name = Moseley N
| addressee affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION II)
| docket = 05000281
| license number = 
| contact person = 
| document report number = 446-S, LER-75-05-010, LER-75-5-10, NUDOCS 8402280117
| package number = ML20086Q745
| document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| page count = 2
}}
{{LER
| Title = Updated LER 75-05/010:on 750225,radial Trip of Max 2.5% Existed.Caused by Prolonged Recovery of Rod F-2.Control Room Alarm Did Not Function Due to Defective Circuit Card. Card Replaced & Staff Cautioned
| Plant = 
| Reporting criterion = 
| Power level = 
| Mode = 
| Docket = 05000281
| LER year = 2075
| LER number = 5
| LER revision = 
| Event date = 
| Report date = 
| ENS = 
| abstract = 
}}

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LICENSEE EVENT REPORT                                                  updatcd Report Previous Report Dated 022575 O# *
* CONTROL ULOCK s
                                                            !    l    l    l  l     l                                   (PLEASE PRINT ANh n L INFORMATION) 1                           6 NA (                                         (CENSE NUMO!n                                               i                  TV (
LE Iv l^ l s I el si 21                         I1bolo I-I ol of ol olo I-Io.1 o'l                               I 41 i I ili lo I lo li I 7 09                                   14 23      20                    30      31     32 CA1(C00f           ty         fu                    DOCKET NUMRin                                   (VENT DAff                      $4E8'ont DATC
      @COtri l p l 0 l 7 o             57       bo d09 W        60 l0 l 5 l 0 l-l 0 l 2l 8l 1l 61                                        UU
[0 l 2 l 2 l 5 l 7 l 5l 69                         74 l0 l4 l0 l8 l 7 l 5l 75                       00 EVINT DESCntPilON i
EB l Durinn 100 per cent power operation a check of the outputs of the excore detectors                                                                                l 7 UU                                                                                                                                                                  ca
      @[ l revealed that a radial tilt of a maximum of 2.5 per cent existed.                                                                 This tilt had been [
7 oo                                                                                                                                                                 ao E[ l generated earlier in the day be a dropped control rod and the operations associated                                                                               l 7 oD                                                                                                                                                                 co
   , @ l with its recovery. The tilt resulted from the prolonged recovery of the rod (F-2)                                                                                   l 7 oo                                                                                                                                                                  go gg [ which built in a radial Xenon distribution. A0-S2-75-05                                                                                                           l 7 uo                                                                          ,,,,,,,                                                                                eo SYSitM        cAust                                               CoWONTNT                   COMPONtPa rout         Cout                 COMPONENT CODE                  sursu n                  MAfJUI AClur{H          VIOLATON BE l RlC l W 7 UU 10                   11 lIl Nl Sl TlR lU l 12                             17 U43             44 lW l 1l 2l0 l 47
[j 48 CAUSE DESCn!PTION DE l A control room alarm, based on excore detcetors, h'ortaally alerts the operator in the l 7 o9                                                                                                                                                                 oo
     @ l cvent the core radial distribution tilts 2 per cent or more to any upper or lower                                                                                   l 7 09                                                                                                                                                                 80 c
DE b undrant. This alarm did not function due to a circuit card which was defective.
7 nU
                                                                                                                                                                         ]un
                 's~17tN              s Pomn                       otstn stArus            Es'EEv" trey"                         oiscovtar otsenc10N 7 0 W                l 1l0 l0 l l N/A 10               12 13                               44 l    ]4S            l 46 N/A 80 l
ACIMTY         CONT E N T OCLEAS!D                                 AMOUNT OF ACIM1Y                                                        LoCA10N of AELEASE ll          l A_j        OF 5;ttf A$f l d10                      N/A                          l            l                      N/A                                            l 7 0          0                          11                                        44         4b                                                                      00 pen 3ONNEL EXPOSURES NUM0tn            itPE         DISCfhPT OtJ gg l 0l0 l 0 l               [ 4J       l          N/A                                                                                                                l 7 OD                   11       12      13                                                                                                                           60 PERSONNEL INJun:ES NUMD(n              OCSCH:PTON
     @ l0l0l0l11 12 7 89 l       N/A                                                                                                                              l 00 Of FSITt CONSEQUENCES hl N/A 7 00                                                                                                                                                                 80 l
LOSS On OAMAGE TO FACILITY
* TYPF        Dtf.CFtP10N                                                                                                              .
    .7 35 o9 d        l N/A                                                                                                                                               l  ,
to                                                                                                                                                  so PUBLICITY 8402280117 750408 Ql N/A 7 00 hDRADOCK 05000281 PDR l.
                                                         .,                                                                                                               60 ADDITIONAL FACTORS Ql lThe failed card was replaced and the operations staff cautioned to monitor the ,xcore l 7 89                                                                                                                                                                 ao g ldctector-indicated. tilt subsequent to dropped rod occurrences.                                                                                                     g 7 00                                                                                                                                                                 8o     ;
NAME: Tyndall L. Baucom                                                                           ONE(804) 771-3748                          .
l GPO 889 467       I

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                                                                                                      ,(*c   .       o];;:y,'.7 April 14, 1975                       -
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Mr. Noman C. lioneley, Director                            Scrial No. 446-S Office of Incpection and rnforcement-                      P0&M/JTDac1w United States I;uclear Regulatory Commission Ecgion II - Suito 818                                      Docket No. 50-281 230 Peachtree Street, Nortiniest                          License No. DPR-37 Atlanta, Georgia       30303

==Dear Mr. Moseley:==

Attached for your information are forty (40) copies of supplementary information for Abnora l occurrence Report No. A0-S2-75-05.
Very truly yours; b.Nf.8hk'y '
O. M. Stallings                           ,
Vice Precident-Pouer Supply                                                l nnd Production Operations                                               .
Fuelocures 40 copies of A0-S2-75-05                                                            .
cc: Mr. K. R. Coller b
                      , . ,
}}

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