ML19309D996

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RO 50-313/78-12:on 780424,Group 7 Control Rods Dropped Into Core Due to Gate Drive Circuit Failure.Cause Unknown.Group 6 Inserted to Obtain Required Overlap.Gate Will Be Repaired or Replaced
ML19309D996
Person / Time
Site: Arkansas Nuclear Entergy icon.png
Issue date: 04/25/1978
From: David Williams
ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML19309D993 List:
References
1-048-19, 1-48-19, NUDOCS 8004110780
Download: ML19309D996 (1)


Text

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UGHT UTTLEROCK, ARKANSAS 7 COMP ANY April 25, 1978 2203 (501)371-4000 T E LE C 0P Y 2

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E OfficeMr. G. L. Madsen g:- u Region IVof Inspection & Enf, Acting Director

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U. S. Nuclear Regul orcement h

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Arlington, TexasRyan Plaza Drivaatory Commission 2

76011, Suite 1000

Subject:

Docket No. 50-313 Arkansas ne-Unit 1 Reportable OccurreLicense No. DP No. 50-313/78-12 Gentlemen:

nce Report At 2045 hours0.0237 days <br />0.568 hours <br />0.00338 weeks <br />7.781225e-4 months <br /> control rods droppe/24/78 while on 4 drive circuit.

d into the core due togenerating at 75% po maintaine required by T.S. 3Due to this failur not known.d as L

e, the 25a failurewer, group 7 Corrective obtain the of a

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replaced. required ovaction 5.2.5.2 t 5% cverlap was or gate was taken by insertithe failure is Cause the minimum There erlap.

of not The failed gate was safety of the public. overlap requiremen no ng core group 6 safety significanccircuit will be to t, thus no hazard e

to the health andassociated wit ery tru1 7 yours, d

Daniel g WilliamWW.24 DHW:cy ager, Licensing s

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