View source for PNO-V-85-055, on 850820,initial Criticality Achieved W/Boron Concentration within Expected Acceptance Criteria for Estimated Critical Conditions.Low Power Physics Testing in Progress & Expected to Be Completed in 7 Days

{{Adams
| number = ML20137F211
| issue date = 08/20/1985
| title = PNO-V-85-055:on 850820,initial Criticality Achieved W/Boron Concentration within Expected Acceptance Criteria for Estimated Critical Conditions.Low Power Physics Testing in Progress & Expected to Be Completed in 7 Days
| author name = Dodds R, Mendonca M
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION V)
| addressee name = 
| addressee affiliation = 
| docket = 05000323
| license number = 
| contact person = 
| document report number = PNO-V-85-055, PNO-V-85-55, NUDOCS 8508260171
| 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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PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-V-85-55          -Date: 8/20/85 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: Pacific Gas and Electric                            Emergency Classification Diablo Canyon Unit 2                                   Notification of Unusual Event Docket No. 50-323                                      Alert Site Area. Emergency General Emergency
_XX_Not Applicable

==SUBJECT:==
UNIT 2 INITIAL CRITICALITY The licensee completed all prerequisites and commenced pulling control rods at 3:03 PM PDT on August 19, 1985 for the initial approach to criticality on Unit 2.
Boron dilution was initiated with control rod bank "D" at 170 steps at 8:26 PM.
Initial criticality was achieved at 2:16 AM PDT on August 20, 1985, with a boron concentration of approximately 1340 PPM, well within the expected acceptance criteria for the estimated critical conditions. Low power physics testing is in progress and is expected to take 7 days to complete.
This preliminary notification is for information only.
CONTACT:   M. Meondonca, 805-595-2354;      R. Dodds, FTS 463-3720 55 u.
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ACRS                            Licensee:    V CA                              (Reactor Licensees)          REGION V: FORM 211 PDR                             Resident Inspector                 (Revised 3/14/83) 8508260171 850820
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