ML20040A224

LER 81-060/03L-0:on 811210,two of Four RCS Hot Leg Temp & Two RCS Wide Range Pressure Indications Read Low.Caused by Low Current in Reactor Vessel Level Indication Sys. Instruments Disconnected.Amend to RFC Initiated

ML20040A224
Person / Time
Site:	Cook
Issue date:	01/08/1982
From:	Palmer R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20040A219	List: ML20040A218 ML20040A224
References
LER-81-060-03L, LER-81-60-3L, NUDOCS 8201200563
Download: ML20040A224 (2)

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o 121 l DURING NORMAL OPERATION, TWO 0F THE FOUR REACTOR COOLANT SYSTEM (RCS) HOT LEG TEMPER- l io i3i I ATURE INDICATIONS AND THE TWO RCS WIDE RANGE PRESSURE INDICATIONS WERE FOUND TO BE l lo l41 l READING LOW, (0NLY TWO WIDE RANGE TEMPERATURE CHANNELS ARE REQUIRED TO BE OPERABLE PERl 10isi l TECHNICAL SPECIFICATION TABLE 3.3-11). THE EVENT WITH THE WIDE RANGE PRESSURE INDI- l I o is l I CATORS WAS NON-CONSERVATIVE WITH RESPECT TO TECHNICAL SPECIFICATION TABLEl 3.3-11 l 0 l 7 ) I ITEM 4. THE ACTION REQUIREMENTS WERE FULFILLED. l I

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j@ lNl@ [_N_j @ lWl112l0l@ 47 35 36 40 42 43 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h liloil ON NOVEMBER 7, 1981, A PORTION OF THE NEW REACTOR VESSEL LEVEL INDICATION SYSTEM l liiijl (RVLIS) WAS INSTALLED. DURING INITIAL TESTING 0F THIS INSTALLATION, A LOW CURRENT i

, , i CONDITION WA5 FOUND TO BE CAUSING THE WIDE RANGE PRESSURE INDICATION LOOP TO BE l i,,3i l READING LOW. THE RVLIS INSTRUMENTS WERE DISCONNECTED AND AN AMENDMENT TO THE RFC l i , ,4 i l WAS INITIATED. (SEE ATTACHED SUPPLEMENT) l

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. 1 ATTACHMENT TO LERisi-060/03L-0 SUPPLEMENT TO CAUSE DESCRIPTION l ON NOVEMBER 7, 1981, A PORTION OF RFC-12-2444, REACTOR VESSEL LEVEL INDICATION SYSTEM (RVLIS) WERE INSTALLED WHICH REQUIRED CROSS-TIES INTO THE WIDE RANGE INDICATION SYSTEM. ON DECEMBER 10, 1981, DURING TROUBLESHOOTING AND INITIAL TESTING 0F RVLIS IT WAS DISCOVERED THAT A LOW CURRENT CONDITION WAS PRESENT WHICH CAUSED THE WIDE RANGE INDICATORS TO READ LOW. THE RVLIS INSTRUMENTS WERE DISCONNECTED AND THE WIDE RANGE INDICATORS RETURNED TO NORMAL. AN AMENDMENT TO THE RFC WAS INITIATED TO INSTALL CURRENT ISOLATORS BETWEEN RVLIS /SD THE AFFECTED INDICATORS.

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