-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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 EPkRxW83rJcK6W3luK9ejQ==

<SEC-DOCUMENT>0001196249-07-000002.txt : 20070103
<SEC-HEADER>0001196249-07-000002.hdr.sgml : 20070101
<ACCEPTANCE-DATETIME>20070103113006
ACCESSION NUMBER:		0001196249-07-000002
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20070101
FILED AS OF DATE:		20070103
DATE AS OF CHANGE:		20070103

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			KASRIEL BERNARD
		CENTRAL INDEX KEY:			0001196249

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-04119
		FILM NUMBER:		07501916

	BUSINESS ADDRESS:	
		BUSINESS PHONE:		8433837000

	MAIL ADDRESS:	
		STREET 1:		C/O SONOCO PRODUCTS CO
		STREET 2:		1 N SECOND STREET
		CITY:			HARTSVILLE
		STATE:			SC
		ZIP:			29550

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NUCOR CORP
		CENTRAL INDEX KEY:			0000073309
		STANDARD INDUSTRIAL CLASSIFICATION:	STEEL WORKS, BLAST FURNACES  ROLLING MILLS (COKE OVENS) [3312]
		IRS NUMBER:				131860817
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		2100 REXFORD RD
		CITY:			CHARLOTTE
		STATE:			NC
		ZIP:			28211
		BUSINESS PHONE:		7043667000

	MAIL ADDRESS:	
		STREET 1:		2100 REXFORD ROAD
		CITY:			CHARLOTTE
		STATE:			NC
		ZIP:			28211

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NUCLEAR CORP OF AMERICA INC
		DATE OF NAME CHANGE:	19680911

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	AZTEC MECHANICAL CONTRACTORS INC
		DATE OF NAME CHANGE:	19660629
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2007-01-01</periodOfReport>

    <noSecuritiesOwned>1</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000073309</issuerCik>
        <issuerName>NUCOR CORP</issuerName>
        <issuerTradingSymbol>NUE</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001196249</rptOwnerCik>
            <rptOwnerName>KASRIEL BERNARD</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>1915 REXFORD ROAD</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>CHARLOTTE</rptOwnerCity>
            <rptOwnerState>NC</rptOwnerState>
            <rptOwnerZipCode>28211-</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <footnotes></footnotes>

    <ownerSignature>
        <signatureName>Kelly J. Wilmoth - Attorney-in-fact</signatureName>
        <signatureDate>2007-01-03</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>powerofattorney.txt
<DESCRIPTION>POWER OF ATTORNEY LETTER
<TEXT>
Exhibit 24

Confirming Statement

This Statement confirms that the undersigned, Bernard Kasriel, has
authorized and designated Terry S. Lisenby, James D. Frias, A. Rae
Eagle and Kelly J. Wilmoth to execute and file on the undersigneds
behalf all Forms 3, 4, and 5 (including any amendments thereto) that
the undersigned may be required to file with the U.S. Securities and
Exchange Commission as a result of the undersigneds ownership of or
transactions in securities of Nucor Corporation.  The authority of
Terry S. Lisenby, James D. Frias, A. Rae Eagle and Kelly J. Wilmoth
under this Statement shall continue until the undersigned is no
longer required to file Forms 3, 4 and 5 with regard to his ownership
of or transactions in Nucor Corporation, unless earlier revoked in
writing.  The undersigned acknowledges that Terry S. Lisenby,
James D. Frias, A. Rae Eagle and Kelly J. Wilmoth are not assuming
any of the undersigneds responsibilities to comply with Section 16
of the Securities Exchange Act of 1934.
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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