05000315/LER-1980-017-03, /03L-0:on 800804,during Low Power Physics Test After Refueling,Boron Injection Tank Discovered to Have Boron Concentration Below Required Min.Caused by Inadequate Mixing Due to Low Recirculation Flow

/03L-0:on 800804,during Low Power Physics Test After Refueling,Boron Injection Tank Discovered to Have Boron Concentration Below Required Min.Caused by Inadequate Mixing Due to Low Recirculation Flow

ML17331A429
Person / Time
Site:	Cook
Issue date:	09/03/1980
From:	Chadwell H INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17331A428	List: 05000315/LER-1980-017, Forwards LER 80-017/03L-0 05000315/LER-1980-017-03, /03L-0:on 800804,during Low Power Physics Test After Refueling,Boron Injection Tank Discovered to Have Boron Concentration Below Required Min.Caused by Inadequate Mixing Due to Low Recirculation Flow
References
LER-80-017-03L, LER-80-17-3L, NUDOCS 8009090508
Download: ML17331A429 (4)

LER-1980-017, /03L-0:on 800804,during Low Power Physics Test After Refueling,Boron Injection Tank Discovered to Have Boron Concentration Below Required Min.Caused by Inadequate Mixing Due to Low Recirculation Flow

Event date:
Report date:
3151980017R03 - NRC Website

text

NRC FORM 366 U. S. NUCLEAR REGULATORY COMMISSION

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LlCENSEE EVENT REPORT I

CONTROL BLOCK:

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES Q10

~O2 DURING LOll POWER PHYSICS TESTING FOLLOWING REFUELING THE BORON INJECTION TANK AF

~O3 A ROUTINE SAMPLING AND ANALYSIS, WAS DISCOVERED TO HAVE A'ORON CONCENTRATION OF 19731 PPM.

THIS IS LESS THAN THE MINIMUM OF 20000 PPM RE UIRED BY T.S. 3.5.4.1.B.

THERE

~OB WERE NO PROBABLE CONSEQUENCES.

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IT IS BELIEVED THAT INADE UATE MIXING BECAUSE OF LOW RECIRCULATION fLOW CAUSED THE CON CENTRATION TO FALL BELOW MINIMUM.

THE BIT HAD BEEN DRAINED DURING THE REFUELI G

AGE AND REFILLED WITH 2000 PPM BORATED WATER, THEN RECIRCULATED THROUGH THE BAST WITH 3

4 THE TRANSFER PUMP ON LOW SPEED.

RECIRCULATION FLOW THROUGH THE BIT FROM THE BORIC ACID STORAGE TANK WAS INCREASED BY PLACING THE TRANSFER PUMP IN fAST SPEED.

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SUPPLEMENT TO LER 80-017/03L-0 SUPPLEMENT TO CAUSE DESCRIPTION GAL. BATCH OF 25000 PPM CONCENTRATION WAS ADDED TO THE BAST AND RECIRCULATED THROUGH THE BIT.

THE BIT CONCENTRATION WAS 20044 AFTER 3.3 HOURS.

THE PRO-CEDURE FOR PLACING THE BIT IN SERVICE HAS BEEN CHANGED TO REQUIRE RECIRCULA-TION AT HIGH SPEED AFTER REFILLING THE TANK.