05000324/LER-1982-133-03, /03L-0:on 821204 & 05,discovered Inoperable RTGB Position Indication for Control Rods 10-31,38-23 & 18-11. Caused by Defective IC Chip & Transistor on Probe Buffer Board of Rod 18-11 & Defective Reed Switch

/03L-0:on 821204 & 05,discovered Inoperable RTGB Position Indication for Control Rods 10-31,38-23 & 18-11. Caused by Defective IC Chip & Transistor on Probe Buffer Board of Rod 18-11 & Defective Reed Switch

ML20028C250
Person / Time
Site:	Brunswick
Issue date:	12/31/1982
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20028C247	List: 05000324/LER-1982-133, Forwards LER 82-133/03L-0 05000324/LER-1982-133-03, /03L-0:on 821204 & 05,discovered Inoperable RTGB Position Indication for Control Rods 10-31,38-23 & 18-11. Caused by Defective IC Chip & Transistor on Probe Buffer Board of Rod 18-11 & Defective Reed Switch
References
LER-82-133-03L-01, LER-82-133-3L-1, NUDOCS 8301070260
Download: ML20028C250 (2)

LER-1982-133, /03L-0:on 821204 & 05,discovered Inoperable RTGB Position Indication for Control Rods 10-31,38-23 & 18-11. Caused by Defective IC Chip & Transistor on Probe Buffer Board of Rod 18-11 & Defective Reed Switch

Event date:
Report date:
3241982133R03 - NRC Website

text

NRC FORM 366 U. S. NUCLEAR REGULATCRY COMMISSION

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 76 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h

[ o l 2 l [ Routine surveillance during a reactor startuo revealed conerni rna 10-31 lacked RTGB l

,g,3, ; position indication at position "01."

During subsequent power operation on December 5.1 1982, it was discovered control rod 38-23 lacked RTGB position indication at position l

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,g,3, g"19" and control rod 18-11 had continuous RTGB " full in" position indication regardlessi pf actual rod position.

In each case actual rod positions were verified in accordance I o g f th technical specifications. This event did not affect the health and safety of the l i

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o lA defective IC chip and transistor on the RPIS ornbe buffer board of rod 18-11 caused l its indication problems. The IC chip and transistor were replaced and indication for,

g the rod position was returned to normal. The indication problems affecting rods 10-31,

and 38-23 are believed to be reed switch problems and will be fully investigated and l

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LER ATTACHMENT - RO #2-82-133 Facility: BSEP Unit No. 2 Event Date: December 4, 1982 An investigation of the indication problem affecting control rod 18-11 revealed a defective IC chip, G33, and a defective transistor, Q16, in the rod position indication probe buffer board, General Electric Part No. 719E351PIRC, had caused the continuous " full-in" indication with the rod. G33 and Q16 were replaced and position indication for the rod was returned to normal.

Initial troubleshooting of the indication problems affecting rods 10-31 and 38-23 showed the most probable cause of these problems is a defective rod position indication probe reed switch in each rod.

The problems affecting these rods will be fully investigated and resolved during a future outage.

These type indication problems do not constitute a safety hazard and occur occasionally; therefore, no design modifications are planned regarding these problems.