israel has not signed the nuclear non-proliferation treaty. nor does israel intend to sign said treaty. a treaty is an agreement among sovereign states that they adhere to freely and voluntarily. no authority on planet earth can force a sovereign to adhere to a treaty. since israel is not a signatory of the npt, the iaea has no authority to inspect israel's nuclear facilities with the exception of the small research reactor. end of story.
Fear of rioting, disorder at Temple Mount prompt restrictions on Muslim worshiper (Haaretz)
from the article: IAEA will not tie Israel's nuclear program with Iran, sources say