ML20049H657

LER 82-005/03L-0:on 820130,during Single Control Rod Scram Testing,Crd H-10 Failed to Scram.When Solenoid Fuses Pulled,Crd Failed to Scram.Caused by Sticking Scram Pilot Solenoid Valve.Both Valves Replaced & Tested

ML20049H657
Person / Time
Site:	Dresden
Issue date:	02/23/1982
From:	Bader S COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20049H649	List: ML20049H648 ML20049H657
References
LER-82-005-03L, LER-82-5-3L, NUDOCS 8203030416
Download: ML20049H657 (2)

Text

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3 60 61 OoCKET NuMSER 68 69 EVENT QATE 74 75 REPORT QATE 30 EVENT DESCRIPTION AND PROBASLE CONSEQUENCES h l o 121 l During normal operation, while conducting routine single control rod scram testing, CRD l

,9 3 y H-10 failed to scram. When the scram solenoid fuses were pulled in an attempt to scram  ;

the rod, the CRD failed to scram. (Tech. Spec. 3.3.C). The rod was fully inserted and  ;

electrically disarmed. This event was of minimal safety significance since the rod was y immediately fully inserted where it remained until repairs were completed. There was no ,

effect on the health or safety of the public. Previous occurrence reported on Docket 50-237 by R.O. 81-063/03L-0.

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CAuSE DESCRIPTION AND CORRECTIVE ACTIONS liloI lThe cause was a sticking scram pilot solenoid valve. Both valves were replaced and satis-1

,, ,,, ,factorily tested. All scram times were well within Tech. Spec. limits. Half core scram l

, y testing per DTS 300-2 will continue to be performed every 16 weeks.  ;

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,( STA UNIT YEAR NO.

i mRTil TiitE Or oEvlariON OCCURRED pgg gg Failure of CRD H-10 (30-39) to Scram SYSTEM AFFECTED 300 PLANT STATUS AT TIME OF EVENT TESTING CRD oggg Run , , ,, , 3 1250

, g,ggy,g3 386 O O YES NO cESCRIPTION OF EVENT During half-core scram testing per SP 82-1-11, it was not possible to individually scram test CRD H-10. Scram fuses were pulled and CRD still did not scram.

Inserted CRD to "00" and electrically disarmed it.

10 CFR50.72 NRC RED PHONE d NOTI' IC ATION MADE YES NO EOUIPMENT FAILURE D 18438 BYES NO WORK REQUEST NO. RESPONSIBLE SUPERVISOR OATE P ART 2 l 0PERATING ENGINEER'S COMMENTS Electrical Maintenance replaced both scram pilot valve solenoids and the drive was returned to service.

O EVENT OF PUBL IC I N TER E S T C 2A-HOUR NRC NOTiriCATiON REO D TECH. SPEC. VIOLATION TELEPH REGION III DATE TIME O NON REPORTABLE OCCURRENCE TELEGM/TELECOPY O ' A DAv aEP0aTABLE/T.S. aEcioN iii caTE TIME G 3D CAY REPOR TA BL E/ T. S ,,

O ANNUAL /SPECL REPORT RE0'D IF ABOVE NOTIFICATION IS PER 10CFR21 A.I.R. 4 C 5-DAY WRITTEN REPORT RE0*D PER 10CFR21 L.E.R. ,82-05/03L-0 TELEPH F. A. Palmer 2-8-82 1400 CEC 3 CORPORATE OFFICER DATE TIME PRELIMINARY REPOR , John M. Almer 2-2-82 COMPLETED AND REVI AED UPERATING ENGINEER OATE ,

INVESTIGATED REPORT & RESOLUTION q ACCEPTED BY STATION REVIE.V

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