ML19326B403

AO 50-313/74-08:on 731003,following Reactor Turbine Trip Test,Discrepancies Occurred for Readings on Core Tank Level Indication.Caused by Ref Leg Tank Leakage.Cause of Leakage Unknown.Coolant Removed from Tank

ML19326B403
Person / Time
Site:	Arkansas Nuclear
Issue date:	10/06/1974
From:	Phillips J ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19326B395	List: ML19326B394 ML19326B400 ML19326B403
References
NUDOCS 8004150769
Download: ML19326B403 (2)

Text

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MR NORMAN C MOSELEY DIRECTOR CARE UNITED STATES ATOMIC ENERGY

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SUBJECT ARKANSAS POWER AND LIGHT COMPANY ARKANSAS NUCLEAR ONE UNIT I DOCKET NUMBER 50-313 LICENSE NUMBER DPR-51 ABNORMAL OCCURRENCE REPORT NUMBER 58-313/74-8 FOLLOWING A REACTOR / TURBAN TRIP TEST lj?p-

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AT 1415 HOURS ON OCTOBER 31974 AN INVESTIGATION WAS MADE To pj DETERMINE THE REASON FOR DISCREPANCIES BETWEEN READINGS ON 10RE 1 FLOOD TANK LEVEL INDICATION, INSTRI; MENTATION WAS GIVING AN INCREA ING

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LEVEL INDICATION FOR SEVERAL DAYS, INDICATING RCS IN-LEAKAGE. --

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• 4 COOLANT HAD BEEN REMOVED FROM BOTH TANKS TO STAY WITHIN- TECH

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SPEC LIMITS OF 13 FEET PLUS MINUS 0 PLUS 4 FEET. LEVEL TRANSMITTER

' l ON BOTH TtNKS WERE FOUND TO HAVE LOST LIQUID FROM THE REFERENCE LEGS CAUSING INSTRUMENTATION TO DRIFT HIGH, GIVING A FALSE LEVEL -

INCREASE INDICATION. WHEN REFERENCE lea 5 WERE PROPERLY ESTABLISHED-l THE CORE FLOOD TANK A LEVEL WAS FOUND TO BE 12.4 FEET WHICH c.l IS_S.2 FEET LOWER THAN TECH SPEC LIMIT. _ _

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l REASONS FOR LOSS OF LIQUID FROM THE REFERENCE LEGS ARE STILL BEING EVALUATED, ALTHOUGH EVAPORATION AND LEAKAGE APPEAR TO i BE THE ONLY POSSIBILITY. SAFETY IMPLICATIONS WERE THAT INSUFFICIENT VOLUMM EXISTED IE CORE FLOOD TANK A FOR PROPER OPERATION OF THE CORE FLOODING SYSTEM. i ) ACTION TO BE TAKEN Y 1 FURTHER RESOLVE THE ABOVE IS: I. MAKE l CHl;CK EVERY TWO DAi , AEFERENCE LEGS FOR ONE WEEK 3 THEREAFTER CNCE A ifEEK UNTIL hM RESOLVED. 3. EVALUATE THE NEED FOR

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ADDITIONAL OR REPLACEMENT -INSTRUMENTATION, BUT OF THE DRY LEG TYPE AND OF PERHAPS e NARR0 DER RANGE. 3. NOT DRAIN OUT ANY WATER FROM THE CORE. FLOOD TANKS UNTIL LEVEL TRANSMITTER CHECK HAVE BEEN MADE. 4. VERIFY PROPER VENTING PROCEDURE TO ASSURE REMOVAL I OF POSSIBLY ENTRAPPED NITROGEN. - J D PHILLIPS SENIOR VICE PRESIDENT AUhANSAS POWER AND LIGHT COMPANY NNNN

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