PNO-I-86-006, on 860123,facility Achieved Initial Criticality.Criticality Boron Concentration Was 1,591 Ppm, 32 Ppm Above Predicted Concentration & within Tech Spec Max Margin of 100 Ppm

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PNO-I-86-006:on 860123,facility Achieved Initial Criticality.Criticality Boron Concentration Was 1,591 Ppm, 32 Ppm Above Predicted Concentration & within Tech Spec Max Margin of 100 Ppm
ML20140B965
Person / Time
Site: Waterford Entergy icon.png
Issue date: 01/24/1986
From: Mccabe E, Roxanne Summers
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
To:
References
PNO-I-86-006, PNO-I-86-6, NUDOCS 8601270192
Download: ML20140B965 (1)


l DCS No: 50423860123 Date: January 24, 1986 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-I-86-6 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region I staff on this date.

Facility: Licensee Emergency Classification:

Millstone Unit 3 Notification of Unusual Event Waterford, Connecticut Alert Site Area Emergency General Emergency

_X Not Applicable

Subject:

INITIAL CRITICALITY Millstone 3 achieved initial criticality at 10:00 p.m., January 23, 1986. The criticality boron concentration was 1591 ppm, 32 ppm above the predicted boron concentration, and well within the Technical Specification maximum margin of 100 ppm-The approach to criticality was observed by Region I resident and region-based inspectors. Licensee performance of this evolution was deliberate, carefully controlled, and without incident.

This PN is for information.

CONTACT: R. Summers E. McCabe 488-1104 488-1231 DISTRIBUTION:

H. St. MNBB Phillips E/W Willste Mail: ADM:DMB Chairman Palladino EDO NRR IE NMSS DOT:Trans only Comm. Zech PA OIA RES Comm. Bernthal ELD AE00 Comm. Roberts Comm. Asselstine ACRS Air Rights INP0----

SECY SP NSAC----

CA PDR Regional Offices TMI Resident Section RI Resident Office Licensee:

(Reactor Licensees)

Region I Form 83 (Rev. July, 1984) 8601270192 e60124 N$-I- -006 PDR

-._ ; F-

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