And this from the same link...maybe you understand that the OP had concerns

"With self-inspection comes the open door for Iran to cheat with impunity. The AP report continues:

The Parchin deal is a separate, side agreement worked out between the IAEA and Iran. The United States and the five other world powers that signed the Iran nuclear deal were not party to this agreement but were briefed on it by the IAEA and endorsed it as part of the larger package. Without divulging its contents, the Obama administration has described the document as nothing more than a routine technical arrangement between Iran and the U.N.’s International Atomic Energy Agency on the particulars of inspecting the site."

This information flies in the face of what our President told us

"When President Obama hailed the Iran nuclear agreement on television Tuesday morning, he said the said it would usher in an era of unprecedented access to Iran's nuclear facilities.

"Inspectors will also be able to access any suspicious location. Put simply, the organization responsible for the inspections, the IAEA, will have access where necessary, when necessary," the president said."

Obama says inspectors get access to "any" site in Iran. Is it true? - CBS News

Now the President as he always does uses language to allow him some "wiggle room". This deal was to be open and unfettered for congress and the american people.

This is why...

"Most Americans say Congress should reject the international deal brokered by the Obama administration over Iran's nuclear program, according to a CNN/ORC International poll released Thursday.

A majority, 56 percent, want lawmakers to reject the deal, up slightly from the 52 percent who voiced that position in the same poll last month. Forty-one percent say Congress should accept the deal.


Poll: Majority want Congress to reject Iran nuclear deal | TheHill