The procedure regulating extradition requests to the Iraqi courts is dealt with in Articles 357 to 368 of the Criminal Procedure Code. Article 358(4) prohibits the extradtition of Iraqi Nationals.
This is echoed in Article 21 of the constitution which states:
No Iraqi shall be surrendered to foreign entities and authorities.
Similar rules are found in France (as applied to Roman Polanski), Russia, Germany, Austria, China and Japan.
Global Justice Project: Iraq
Legal Reform in Iraq's Post-War Period (2008-2010)