The biggest threat that Bushehr poses to Israel is that Israel will be unable to restrain itself from making a fool out of themselves by making a huge deal about it when Bushehr goes online. The IAEA and the entire rational world recognize Bushehr as a peaceful, monitored power generation site that is not part of any secret Iranian nuke weapon program. Loud Israeli complaints about Bushehr will undermine any legitimate claims there are about any secret Iranian nuke weapon program. Any claims by Israelis of a link between the two will be used against Israel to damage Israel's credibility. So while it is an easy homerun for Israeli politicians to play petty local Israeli politics with Bushehr, they will hurt Israel in the long run if they do so.
Saudi policeman killed in Mecca after Islamic State raid (Reuters)
from the article: Russia to begin loading fuel into Iran's nuclear reactor next week