View source for PNO-V-86-020, on 850418,Unit 2 Reactor Was Brought to Criticality Following Dilution of Rcs.Estimated Critical B Was 1015 Ppm W/Group 5 Control Rod Bank 75 Inches Withdrawn. Resident Inspector Witness Approach to Initial Criticality

{{Adams
| number = ML20212E964
| issue date = 04/21/1986
| title = PNO-V-86-020:on 850418,Unit 2 Reactor Was Brought to Criticality Following Dilution of Rcs.Estimated Critical B Was 1015 Ppm W/Group 5 Control Rod Bank 75 Inches Withdrawn. Resident Inspector Witness Approach to Initial Criticality
| author name = Miller L, Zimmerman R
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION V)
| addressee name = 
| addressee affiliation = 
| docket = 05000529
| license number = 
| contact person = 
| document report number = PNO-V-86-020, PNO-V-86-20, NUDOCS 9711040123
| 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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,h ,   PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO V-86-20 Date: 4/21/86 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information presented is as initially received without verification or evaluation and is basically all that is known by Region V staff on this date.
FACILITY: Arizona Nuclear Power Projec)UELic 00COMIH1 Fold 1 Emergency Classification Palo Verde Unit 2                                                   Notification of Unusual Event              .
Docket No. 50-529                                                   Alert
                                                          .g yR 22 NO Sg Site Area Emergency General Emergency Not Applicable                             :
itHE PL30EillD

==SUBJECT:==
INITIAL CR!TICALITY On April 18,1985at1445PMMST,t$eUnit2reactorwasbroughttocriticalityfollowing                                                 I
   . dilution of the reactor coolant system. Estimated critical boron concentration was                                            ,
1015 ppm with Group 5 control red bank 75 inchec withdrawn. Actual critical boron                                           '
concentration was 1022 ppm with Group 5 control rod bank 50 inches withdrawn. This is within 0.2 percent of estimated critical conditions. The resident inspectors witnessed the-approach to initial criticality.
Low power physics testing is expected to be completed by April 23rd. The resident inspectors sonitored control room activities over the weekend.
O CONTACT:    L. Miller                      R. Zimmerman, Sr., Resident inspector FTS 463-3869                   (602)386-5260 DISTRIBUTION H St.                  MNBB        _Phillips        E/W     Willste            Air Rights        Mail:
Chairman Pallidino EDO               NRR        ~ IE          NMSS                               ADM:0MB Comm. Zech              PA                           O!A      RES                                DOT:Trans Only Comm. Bernthal          MPA                          AE00 Comm. Roberts           ELD Comm. Asselstine                     Regions:                                                               !"    s SECY                                 INPO         NSAC                                                          gi ACRS                                 Licensee:
CA                                   (Reactor Licensees)              REGION V: FORM 211                        ,Uk PDR                                  Resident Inspector,__                       (Revised 3/14/83)            .}\
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9711040123 860421                                                 SECY, g,cor'ds. 3 Historian',
PDR     ISE PNO-V-86-020             PDR
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