Because of this, nobody trusts Israel's words and because of that, Israel's self certifications are worthless. When Israel is rightly criticized as the only western nation not to sign the NPT, this concern cannot be dismissed by Israel claims that their internal nuclear agency is just as good. The fact that Israel's nuclear agency are subordinate to Israeli politicians mean that it is part of the problem of coverup and not part of the solution that the IAEA would be.
U.S.-led coalition conducts 14 airstrikes against ISIS targets in Iraq, Syria (Reuters)
from the article: Israel to stress safety of its nuclear reactors at IAEA special session