05000333/LER-1979-065-03, /03L-0:on 790907,rod Sequence Control Sys Failed, Not Allowing Normal Control Rod Insertion or Withdrawal. Caused by Failed Relay on One Printed Circuit Board. Replacement of Relay Restored Normal Operation of Sys

/03L-0:on 790907,rod Sequence Control Sys Failed, Not Allowing Normal Control Rod Insertion or Withdrawal. Caused by Failed Relay on One Printed Circuit Board. Replacement of Relay Restored Normal Operation of Sys

ML19209B783
Person / Time
Site:	FitzPatrick
Issue date:	10/04/1979
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19209B781	List: 05000333/LER-1979-065, Forwards LER 79-065/03L-0 05000333/LER-1979-065-03, /03L-0:on 790907,rod Sequence Control Sys Failed, Not Allowing Normal Control Rod Insertion or Withdrawal. Caused by Failed Relay on One Printed Circuit Board. Replacement of Relay Restored Normal Operation of Sys
References
LER-79-065-03L, NUDOCS 7910100453
Download: ML19209B783 (2)

LER-1979-065, /03L-0:on 790907,rod Sequence Control Sys Failed, Not Allowing Normal Control Rod Insertion or Withdrawal. Caused by Failed Relay on One Printed Circuit Board. Replacement of Relay Restored Normal Operation of Sys

Event date:
Report date:
3331979065R03 - NRC Website

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POWER AUTHORITY OF THE STATE OF NEW YORK JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET N0. 50-333 ATTACHMENT TO LER 79-065/03L-0 Page 1 of 1 During normal startup operations, the Rod Sequence Control System failed in such a manner as to not allow normal control rod insertion or with-drawal. The scram function for control rods remained unaffected. The lied Sequence Control System maintained control of the rod withdrawal st:quence by not allowing any motion, thus the system performed its ir. tended function as required by Technical Specifications Appendix A, Paragraph 3.3.B.3.a.

Since the Rod Sequence Control System maintained control of the withdrawal sequence as noted above, the event did not represent a significant hazard to public health and safety.

Investigation revealed a failed relay on one of the printed circuit boards associated with Control Rod Group 3.

Replacement of the relay restored normal operation of the system.

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