05000324/LER-1980-052-03, /03L-0:on 800903,during Reactor Startup Following Refueling Outage,Several Control Rods Were Found to Have Position Indication Problems.Caused by Defective Transistors in Probe Buffer Cards.Transistors Replaced

/03L-0:on 800903,during Reactor Startup Following Refueling Outage,Several Control Rods Were Found to Have Position Indication Problems.Caused by Defective Transistors in Probe Buffer Cards.Transistors Replaced

ML19338F136
Person / Time
Site:	Brunswick
Issue date:	10/01/1980
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19338F123	List: 05000324/LER-1980-052, Forwards LER 80-052/03L-0 05000324/LER-1980-052-03, /03L-0:on 800903,during Reactor Startup Following Refueling Outage,Several Control Rods Were Found to Have Position Indication Problems.Caused by Defective Transistors in Probe Buffer Cards.Transistors Replaced
References
LER-80-052-03L-01, LER-80-52-3L-1, NUDOCS 8010070558
Download: ML19338F136 (2)

LER-1980-052, /03L-0:on 800903,during Reactor Startup Following Refueling Outage,Several Control Rods Were Found to Have Position Indication Problems.Caused by Defective Transistors in Probe Buffer Cards.Transistors Replaced

Event date:
Report date:
3241980052R03 - NRC Website

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8 60 El DOCKET NUMSER 68 69 EVENT DATE 74 75 REPORT QATE 80 EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h ITTTI I During reactor startup following the completion of a routine refueline outare.

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4 LER ATTACHMENT - RO # 2-80-52 Facility: BSEP Unit No. 2 Event Date: 09-03-80 A defective transistor in each of the probe buffer cards of rod number 22-31 and rod number 26-19 caused the " full in" and " full out" indication problems experienced with each rod. The defective transistors were replaced and the

" full in" and " full out" indications for each rod were checked satisfactory.

The transistors apparently failed due to end of life; therefore, no further action is required.

Exact causes for the continuous rod " drift alarm" on rod number 26-23 and the poaltion "04" indication problem on rod number 22-31 cannot be determined until the next outage of sufficient length to allow access to the drywell.

These problems will be corrected at that time.