ML19290B912

LER 79-030/03L-0:on 791110,during Scram Testing in Refuel Mode,Substantial Loss of Position Indication Noted for Control Rod Driveline H-9.Cause Unknown.Suspect Rod Position Indicator Probe & Cabling to Be Inspected at Next Outage

ML19290B912
Person / Time
Site:	Dresden
Issue date:	12/06/1979
From:	Magrow R COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19290B907	List: ML19290B906 ML19290B912
References
LER-79-030-03L-01, LER-79-30-3L-1, NUDOCS 7912140430
Download: ML19290B912 (2)

Text

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(PLEASE PRINTOR TYPE ALL REQUIRED INFORMATION)

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REPORT OATE EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h g l During scram testing in refuel mode, substantial loss of position indication was l

. noted for CRD H-9. Per GE SDM analysis Tech. Spec. 3.3. A.1 met by disarming adja- l g g cent rods G-9 and J-9 at "00" and inserting H-9 to 20, the first functional position. l g ; If ter subsequenC CE SDM analysis, adjacent rods were fully withdrawn. To avoid rod I gg drift, H-9 fully inserted (verified by TIPS) and disarmed. Safety significance minimall g g since SDM was always met. This is the first event of this magnitude. [ .

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43 44 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS h l@ l Precise cause of occurrence is unknown at this H-o .  % susnece *nr1 position indi- [

Q l cator probe and cabling will be inspected during next available outage. Corrective I g l actions will be taken at that time. A supplemental LER will be filed after in- l g l spection. Until then. CRD H-9 will remain fully inserted and electrically disarmed.

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ST  % POWER OTHER STATUS I O ER OISCOVERY DESCRIPTION

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DEVIATION REPORT DVR NO.

Commonwealth Edison -

STA UNIT YEAR N O.

8 12 3 7 9 -' 58 PART1 TI TLE OF DEVI ATION OCCU RRED 11-10-79 1500 CRD H9, Loss of Indicated Position between 0 and 17 DATE TIMi SYSTEM AFFECTED PLANT CONDITIONS TESTING 300 Control Rod Drive MODE Refuel pwp ,yw7) 0 , to,gggwg) 0 YES NO DESCRIPilON OF EVENT Following scram on 11-10-79, CRD H-9 was withdrawn after adiustments to the scram ontier valve. No position indications (blank windows) were noted for any positions. More fully in-serted than position 17. The next position displaying indic. was "20".

DESCRIPTION OF CAUSE Suspect bad RPIS probe reed switches, or cable connectors O'THER APPLICABLE INFORMATION Pflu lll i FNAL ~

Two adjacent rods taken out-of-service fully inserted and CRD H-9 taken out-of-service at position 20, per GE. This array very conservatively assures that the SDM is met.

EQUIPMENT YES DR NO. WRNO.

FAILURE Mi hael Wrteht _11 11-70 O NO 2996 DESPONSIBLE SUPERVISOR DA TE PART 2 OPERATING ENGINEERS COMMENTS GE contacted and orovided analysis showine nanEm en shuranu, , r , 4 ,, u4rw con n_o * -m-4-4m-20 and CRD's J-9 and G-9 at position 00. CRD H-9 was declared inoperable by Tech. Spec 3.3. A.2.d because scram times cannot be verified.

SAFETY-TYPE OF CEVIATION EVENT OF POTENTIAL TECH SPEC NON-REPORTABLE ANNUAL RELATED REPORTABLE OCCURRENCE PUBLIC INTEREST VIOLATION OCCURRENCE REPORTI NG WR ISSUED 14 DAY 10CFR21 YES -( YES 30 DAY NOTI FI CATION NO NO X

6 . 6 . 9 _ ') . h REPORTABLE CCCURRENCE ACTION ITEM NO. PROMPT ON-SI TE NOTI FICATION NUMBER C. E. Sargent 11-13-79 1130 E- 79 30-03L-0 IRE DATE TIME 234 TITLE CATE TIME 24-HOUR NRC NOTIFICATION PROMPT OFF-SITE NOTIFICATION TPH F. A. Palmer 11-14-79 2:03 REGION lli DATE TIME T I TL E DATE TIME TGM J. R. Gilliom 11-14-79 2:03 REGION lli & COL CATE TIME TI TLE DATE TIME RESPONSI BLE COMP ANY OFFI CER I N FO RMED O F !OCFR21 -

CONDITIONS AND THEIR AEPOpr TO NPC * ( L L f,', 7 t TL M i DATE TIMt REVI EW AND COMPLETE -Mi in C A BY STATION REVIEW

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• y DATE b 4 RESOLUTION APPROVED AND ' / ' '

AUTHORIZED FOR CISTRIBUTION "-

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