05000249/LER-1979-030-03, During Scram Testing in Refuel Mode,Substantial Loss of Position Indication Noted for Control Rod Driveline H-9.Caused by Improperly Seated Socket,Suggesting Faulty Electrical pin-socket Alignment

During Scram Testing in Refuel Mode,Substantial Loss of Position Indication Noted for Control Rod Driveline H-9.Caused by Improperly Seated Socket,Suggesting Faulty Electrical pin-socket Alignment

ML17340B416
Person / Time
Site:	Dresden
Issue date:	03/26/1980
From:	COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17340B415	List: 05000249/LER-1979-030-03, During Scram Testing in Refuel Mode,Substantial Loss of Position Indication Noted for Control Rod Driveline H-9.Caused by Improperly Seated Socket,Suggesting Faulty Electrical pin-socket Alignment
References
LER-79-030-03X, LER-79-30-3X, NUDOCS 8004080463
Download: ML17340B416 (2)

LER-1979-030, During Scram Testing in Refuel Mode,Substantial Loss of Position Indication Noted for Control Rod Driveline H-9.Caused by Improperly Seated Socket,Suggesting Faulty Electrical pin-socket Alignment

Event date:
Report date:
2491979030R03 - NRC Website

text

LICENSE NUMBER B

U. S. NUCLEAR REGULATORY COMMISSION PREVIOUS BZiPORT DATE 12-6-79" QLICENEEE EVENT REPORT

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES 10 During scrara testing in refuel mode, substantial loss of position indication was noted for CRD H-9.

Per G.E.

SDM analysis, Tech.

Spec.

3.3.A41 met by disarmiT1g adjacent rods 0-9 and 3-9 at "00" and inserting 8-9 to 20, the first functional position.

After subsequent GE SDM analysis, adjacent rods were fully withdrawn.

To avoid rod drift-,

H-9 fully inserted (verified by TIPS) and disarmed.

Safety significance minimal since SDM was always met.

This is the first event of this magnitude.

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Inspection of rod position indicator probe revealed that socket was not ro erl seated suggesting that electrical pin-socket alignment had been fault Entire Drobe was replaced and correct rod position indication was restored.

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