ML20024E226

LER 83-062/03L-0:on 830215,procedure Approved Containing Data Base & Method for Determining Control Rod Position. Procedure Written Due to Six Events That Occurred Between 800415 & 830215 Where Rod Position Indication Exceeded

ML20024E226
Person / Time
Site:	Cook
Issue date:	08/03/1983
From:	Palmer R INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20024E225	List: ML20024E224 ML20024E226 ML20024E227
References
LER-83-062-03L, LER-83-62-3L, NUDOCS 8308100023
Download: ML20024E226 (3)

Text

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. . LICENSEE EVENT REPORT CONTROL GLOCK: l I I I I I lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI to lil4lM

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REPORT DATE EVENT OESCRIPTION AND PROSABLE CONSEQUENCES Oio iO ,21 1 N 0 04-15-80, PNSRC APPROVED A TECHNICAL SPECIFICATION CLARIFICATION CONCERNING " INDICA-I l o t a l ITED R0D POSITION INDICATION" IN RESPECT TO THE PLUS OR MINUS 12 STEP LIMIT OF TECHNICAL l t o t a l ISPECIFICATION 3.1.3.2. BASED ON CORRESPONDENCE WITH THE NRC. SINCE 04-15-80. SIX l t o i s i l EVENTS HAVE OCCURRED AND WERE AT THE TIME DETERMINED TO BE NON-REPORTABLE, BASED ON I lo m iITHIS CLARIFICATION. THESE EVENTS ARE NOW BEING REPORTED SINCE THERE WAS NOT AN APPROVEQ l o 1 ii iPROCEDURE TO DETERMINE THE ACUTAL R0D POSITION. BY MEASUREMENT OF THE C0Il STACK V0L

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!>l I DETERMINING CONTROL R0D POSITION. THIS PROCEDURE IS USED WHEN A R0D POSITION I i.,,ii INDICATOR DRIFTS OUT OF THE ALLOWABLE TECHNICAL SPECIFICATION TOLERANCES. I i t il I '

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ATTACHMENT TO LER# 83-062/03L-0 PAGE 1 07 2 SUPPLEMENT TO EVENT DESCRIPTION ON 04-15-80, PNSRC APPROVED A TECHNICAL SPECIFICATION CLARIFICATION DEALING WITH INDICATED ROD POSITION INDICATION BASED ON CORRESPONDENCE WITH THE NRC. THIS CLARIFICATION ALLOWED THE PLUS OR MINUS 12 STEP LIMIT OF TECHNICAL SPECIFICATION 3.1.3.2 TO BE FULFILLED BY L.V.D.T. VOLTAGE MEASUREMENTS, PROVIDED THAT A SUFFICIENT DATA BASE HAD BEEN ESTABLISHED TO INSURE A CORRELATION BETWEEN L.V.D.T. VOLTAGE AND ROD POSITION. THE METHODS USED TO PERFORM THESE MEASUREMENTS AND ADJUST THE ROD POSITION INDICATORS WERE FOUND TO VARY BETWEEN THE TECHNICIANS AND THE NEED FOR AN ESTABLISHED PROCEDURE WAS IDENTIFIED.

ON 02-15-83, PNSRC APPROVED A PROCEDURE WHICH CONTAINS A METHOD FOR DETERMINING THE ACTUAL CONTROL ROD POSITION AND FORMALIZED THE DATA COLLECTION METHOD FOR OBTAINING COIL STACK VOLTAGES. READJUSTMENT OF THE INDIVIDUAL ROD POSITION INDICATOR TO MATCH THE ACTUAL ROD POSITION IS PERFORMED FOLLOWING COMPARISON OF COIL VOLTAGES TO DATA BASE INFORMATION.

BETWEEN 04-15-80 AND 02-15-83, SIX EVENTS OCCURRED IN UNIT-1 WHERE THE ROD POSITION INDICATION WAS IN EXCESS OF THE ALLOWABLE TECHNICAL SPECIFICATION TOLERANCE OF 112 STEPS, THESE OCCURRED ON:

. 02-05-81 R0D B-8 PRI WAS 14 STEPS FROM ROD DEMAND POSITION.

l l 10-27-81 ROD P-6 RPI WAS > 12 STEPS FROM ROD DEMAND POSITION.

10-27-81 ROD P-10 RPI WAS > 12 STEPS FROM ROD DEMAND POSITION.

07-02-82 ROD B-10, P-6, B-6, and P-10 WERE > 12 STEPS FROM ROD DEMAND l POSITION.

l 09-15-82 DURING A REACTOR STARTUP, R0D MOVEMENTS RESULTED IN CONTROL l

BANK C, BANK A, AND RODS D-8 AND M-8 WERE INTERMITTENTLY > 12 STEPS FROM DEMAND POSITION.

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ATTACHMENT TO LER# 83-062/03L-0 PAGE 2 0F 2 09-16-82 DURING A REACTOR STARTUP, ROD MOVEMENTS RESULTED IN CONTROL BANK A, BANK B, AND BANK C WERE INTERMITTENTLY >12 STEPS FROM ROD DEMAND POSITION.

THE EVENT DATE USED ON THE LER FORM WAS CHOSEN AS THE DATE THE PROCEDURE WAS APPROVED, 02-15-83.

FOLLOWING THE ESTABLISHMENT OF THE FORMAL PROCEDURE THE VALIDITY OF THE PREVIOUS ROD POSITION DETERMINATIONS WAS QUESTIONED BY OUR NRC SENIOR RESIDENT INSPECTOR, AND AN INVESTIGATION WAS INITIATED. THE INVESTIGATION DID NOT REVEAL ANY REASON TO BELIEVE THAT THE ACTUAL ROD POSITION HAD DEVIATED FROM THE DEMAND POSITION INDICATION. IN REVIEWING THE EVENT WITH THE SENIOR RESIDENT INSPECTOR, IT WAS AGREED THAT THE EVENT WOULD BE REPORTED DUE TO THE UNCERTAINTY ASSOCIATED WITH THE PROCEDURES USED TO ESTABLISH THE DATA BASE AND THE METHODS USED TO DETERMINE THE INDICATED ROD POSITION.

THE DELAY IN SUBMITTING THIS REPORT IS PRIMARILY DUE TO THE FACT THAT IT WAS NOT CLEAR THAT THE EVENT WAS REPORTABLE. ONCE IT WAS AGREED THAT A LER SHOULD BE SUBMITTED THE LER PREPARATION SHOULD HAVE BEEN HANDLED IN A MORE TIMELY MANNER.

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