05000315/LER-1985-021, :on 850429,reactor Vessel Flow Requirement Not Verified Prior to RCS Boron Dilution.Procedure for Filling Reactor Refueling Cavity Revised to Include Verification/ Documentation of Reactor Vessel Flow During RCS Dilution

:on 850429,reactor Vessel Flow Requirement Not Verified Prior to RCS Boron Dilution.Procedure for Filling Reactor Refueling Cavity Revised to Include Verification/ Documentation of Reactor Vessel Flow During RCS Dilution

ML20129E692
Person / Time
Site:	Cook
Issue date:	05/24/1985
From:	Baker K INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:
Shared Package
ML20129E666	List: 05000315/LER-1985-020, :on 850429,low Pressure CO2 Fire Suppression Sys for Quadrant 1 of Reactor Cable Tunnel Isolated W/O Fire Watch Coverage.Caused by Personnel Error.Personnel Counseled 05000315/LER-1985-021, :on 850429,reactor Vessel Flow Requirement Not Verified Prior to RCS Boron Dilution.Procedure for Filling Reactor Refueling Cavity Revised to Include Verification/ Documentation of Reactor Vessel Flow During RCS Dilution
References
LER-85-021, LER-85-21, NUDOCS 8506060565
Download: ML20129E692 (1)

LER-1985-021, on 850429,reactor Vessel Flow Requirement Not Verified Prior to RCS Boron Dilution.Procedure for Filling Reactor Refueling Cavity Revised to Include Verification/ Documentation of Reactor Vessel Flow During RCS Dilution

Event date:
Report date:
3151985021R00 - NRC Website

text

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LICENSEE EVENT REPORT (LER)

P ACILITV NAA8E HI DOCKET NUMSER (2)

PAGE(31 D. C. COOK, UNIT ONE o is l 0 t o I o 131115 1 l0Fl 011 TITLE (48 REACTOR COOLANT SYSTEM BORON DILUTION EVENT DATE (58 LER NUMSER 466 REPORT DATE 17)

OTHER FACILITIES INVOLVED 181 MONTM DAY YEAR TEAR SEjy UONTM OAv YEAR P AC8L'Tv NawES DOCKET NuueERISI O15l010!0 1 I I 0l 4 2l 9 85 8l 5 0l 2l 1 0l0 0l 5 2l 4 8l 5 0 1 5 i 0 to1 0 I i TMis RE, ORT is su uiTuD rumsuANT TO TMi R OUiREutNu O, i0 C,R t re..ae., e,e., rae,eue

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AS$TR ACT finns <f to F400 spaces e e saare.eere<y wreen snap e space tweewretrea haess (16e ON APRIL 29,1985, AT 0422 HOURS WITH TIE UNIT IN MODE 6 (REFUELING), TIE CONTROL ROOM OPERATOR TRANSFERRED WATER FROM TIE REFUELING WATER STORAGE TANK (RWST) TO THE REACTOR COOLANT SYSTEM (RCS). TIE RCS BORON CONCENTRATION WAS 2084 PPM WHILE TIE RWST BORON CONCENTRATION WAS 2069 PPM.

LITERAL INTERPRETATION CONCLUDES THAT THIS IS A DILUTION OF TIE RCS. THE REACTOR VESSEL FLOW REQUIREMENT, SPECIFIED IN TECHNICAL SPECIFICATION 3.I.I.3, WAS NOT VERIFIED PRIOR TO TIE DILUTION.

TIE ACTION STATEMENT REQUIRES IMMEDIATE SUSPENSION OF ALL BORON CONCENTRATION REDUCTION ACTIVITIES. THE DILUTION WAS INITIALLY IDENTIFIED BY TIE NRC RESIDENT INSPECTOR ON MAY I, 1985. CONSEQUENTLY, TIE ACTION STATEMENT REQUIREMENTS WERE NOT MET.

THERE WERE NO ADVERSE SAFETY CONSEQUENCES DUE TO THIS INCIDENT. TECHNICAL SPECIFICATION 3.9.I REQUIRES A BORON CONCENTRATION OF > 2000 PPM FOR ADEQUATE SHUTDOWN MARGIN. THIS REQUIREMENT WAS SATISFIED THROUGHOUT TIE EVENT.

TO PREVENT RECURRENCE, THE PROCEDURE FOR FILLING THE REACTOR REFUELING CAVITY HAS BEEN REVISED TO INCLUDE VERIFICATION / DOCUMENTATION OF THE REACTOR VESSEL FLOW IN TIE EVENT A RCS DILUTION OCCURS.

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