ML20063J160

/03L:on 820810,average Reactor Coolant Temp Decreased Below 541 F for 7 Minutes During Planned Shutdown. Caused by Erroneously Opening Steam Dump Valves Due to Controller Drift.Valves Closed

ML20063J160
Person / Time
Site:	Cook
Issue date:	08/24/1982
From:	Murphy C INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20063J123	List: 05000316/LER-1982-065-03, /03L-0:on 820729,fire Door 388 to Quadrant 2 of Reactor Cable Tunnel Found Ajar & Would Not Latch Due to Bent Inactive Leaf Automatic Thrust Pins.Cause Not Determined.Pins Repaired ML20063J121 ML20063J160
References
82-066-03L, 82-66-3L, NUDOCS 8209020311
Download: ML20063J160 (2)

Text

fdRC FORM 3GG U. S. NUCLEAR REGULATORY COMMISSION

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LICENSEE EVENT REPORT CONTROL BLOCK: l l

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60 61 DOCKET NUMBER 68 b3 EVENT DATE i4 IS REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lo121lDURING A PLANNED UNIT SHUTDOWN WITH THE REACTOR IN MODE 2 THE AVERAGE REACTOR I

0 IoIa11 COOLANT TEMPERATURE DECREASED BELOW 541 FOR A PERIOD OF SEVEN (7) MINUTES.

THE I

U I o 14 i l MINIMUM TEMPERATURE OF THE TRANSIENT WAS 539 F.

REC 0VERY FROM THE TRANSIENT WAS I

i Io lsl I WITHIN THE FIFTEEN (15) MINUTES ALLOWED BY THE ACTION STATEMENT IN TECHNICAL SPEC-l

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THIS EVENT HAD NO EFFECT ON THE HEALTH AND SAFETY OF THE PUBLIC.

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3J J4 35 36 Ji 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h IiioiI DURING UNIT C00LDOWN THE STEAM DUMP VALVES ERR 0NEOUSLY CAME OPEN CAUSING A I

U IiIi11 C00LD0WN BELOW 541 F WHILE THE REACTOR WAS STILL CRITICAL.

THE OPERATOR 1

ii i,i l QUICKLY CLOSED THE STEAM DUMP VALVES AND RESTORED THE RCS TEMPERATURES.

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LER N0. 82-066/03L-0 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 DURING UNIT _C00LD0WN, THE STEAM DUMP VALVES CAME OPEN WHEN THE STEAM DUMP CONTROL WAS PLACED IN MANUAL. THIS CAUSED A C00LD0WN BELOW 541 F WHILE THE REACTOR WAS STILL CRITICAL. THE OPERATOR QUICKLY CLOSED THE STEAM DUMP VALVES. AN INVESTIGATION REVEALED A DRIFT IN A CONTROLLER WHICH RESULTED IN AN ERR 0NE0US OUTPUT SIGNAL TO THE DUMP VALVES CAUSING THEM TO OPEN SLIGHTLY WITH NO OUTPUT FROM THE H/A STATION. THE CONTROLLER WAS RECALIBRATED WHICH CORRECTED THE PROBLEM.

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