05000366/LER-1979-026-01, /01T-0 on 790228:test Revealed 9.84% Failure Rate in 183 safety-related Self Drilling Anchor Bolts.Caused by Improper Installation.All safety-related Sys Hangers of That Type to Be Tested & Repaired

/01T-0 on 790228:test Revealed 9.84% Failure Rate in 183 safety-related Self Drilling Anchor Bolts.Caused by Improper Installation.All safety-related Sys Hangers of That Type to Be Tested & Repaired

ML19282B969
Person / Time
Site:	Hatch
Issue date:	03/08/1979
From:	Thomas Greene GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19282B967	List: 05000366/LER-1979-026, Forwards LER 79-026/01T-0 05000366/LER-1979-026-01, /01T-0 on 790228:test Revealed 9.84% Failure Rate in 183 safety-related Self Drilling Anchor Bolts.Caused by Improper Installation.All safety-related Sys Hangers of That Type to Be Tested & Repaired
References
LER-79-026-01T, LER-79-26-1T, NUDOCS 7903190179
Download: ML19282B969 (3)

LER-1979-026, /01T-0 on 790228:test Revealed 9.84% Failure Rate in 183 safety-related Self Drilling Anchor Bolts.Caused by Improper Installation.All safety-related Sys Hangers of That Type to Be Tested & Repaired

Event date:
Report date:
3661979026R01 - NRC Website

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06 61 DOCK ET NU'J E E R 63 63 EVENT DATE 74 75 HEPORT CAT E 80 EVENT DESCHIFTION AND PROBABLE CONSECUENCES h o

2 l On February 28,1979, at 1000 CST while testing safety related-hancer anchor bolts l

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l per ' Inspection and Testing Procedure for Concrete Expansion Anchors' Procedure

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l HilP-2-11005, it wcs noted that a 9.84 percent failure was found when testing had been i o

a I completed on 183 self drillina anchor bolts.

Although this deviation from normal o

I performance of plant safety related structures requires reporting per Tech Spec sec-1 o

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l tion 6.9.l.8.i, the plant was already shutdown and thus this occurrence had no sig-l oI.

I nificant affect on plant safety.

This is a non-repetitivb occurrence.

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CAUSE

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43 41 42 43 44 47 CAUSE DESCRIPil0N AND CCRRECTIVE ACTIONS Ml The cause of the failure of the self-drilling Phillips ' Rcd Head' type anchors res-l i

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ulted from imprcrer installation.

The method to determine if a proper installation i l

was made is to test the self-drilling and wedge type anchors per HNP-2-11005.

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safety related system hangers of the drop in anchor type will have its anchor bolts l i

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Georgia Power Company Plant E. I. Hatch Baxley, Georgia 31513 Reportable Occurrence Report tio.

50-366/1979-26 Cause Description and Corrective Actionsstartup.

All fatled anchor bolts will be replaced with wedge type anchors in the future.

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NARRATIVE

REPORT FOR LER 2-79-26 On February 28,1979, at 1000 CST while testing safety related hanger anchor bolts per ' Inspection and Testing Procedure for Concrete Expansion Anchors' procedure HNP-2-11005, it was noted that a 9.84 percent failure was found when testing had been completed on 183 anchor bolts.

Although this dev-iation from normal performance of plant safety related structures requires reporting per Tech Specs section 6.9.1.8.i, the plant was already shutdown and thus this occurrence had no significant affect on plant safety.

This was a non-repetitive occurrence.

The cause of the failure of the self-drilling Phillipsy' Red Head' type an-chors resulted from improper installation.

The method'to determine if a proper installation was made is to test the self-drilling and wedge type anchors per HNP-2-11005.

All safety related system hangers will have its anchor bolts tested and repaired by replacement as required per HNP-2-11005 before startup is allowed.

All failed anchor bolts will be replaced with wedge type anchors in the future.

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