ML19344B437

Part 21 Rept Re Testing of 1-inch Diameter Kwik-Bolt Mechanical Expansion Anchors.Corrects Previously Reported Data & Provides Precise Calculations on Average Ultimate Tensile Load,Std Deviation,Working Load & Risk of Failure

ML19344B437
Person / Time
Site:	Grand Gulf
Issue date:	09/12/1980
From:	Henkel H HILTI FASTENING SYSTEMS
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-80-284-002 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8010200710
Download: ML19344B437 (3)

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$ Gentlemen o :

sHilti, Inc.:-has further rediewed the -technicalidata available

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-regarding(the'.in-house: testing of.1-inch: diameter, Kwik-Bolt: l Mechanical' Expansion*~ Anchors reportedito you11n" our referenced .,

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~ ~ MThie' aetual Laveragejultimate s N1oadJ(3i)iobtained during- l this testjprogram was 23,4417In .

.atead ~ofwthe- 234341:previously- b, f reported ' (typographi'cali error) .

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'Also,3 instead of 'usingfthe 'veryMonservative rounding off approach -

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. presented in our referenced letter 1(e.g. _usingi104 in coefficient 4[j g' 'of variatiion calculations instead- of - the- actua14 9.8%)~ 'we9have ;ow

performed precise calculations using the.NBS Applied ~ Math Series - O 55 as the source document.

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. Standard-deviation'(s) = 2,302~1bs'. ,. : ,

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