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Sign In and Out

​​Sign In

IAEA staff accessing NUCLEUS from the Agency network are automatically signed in to NUCLEUS and do not need to follow the steps below. Please note that IAEA staff cannot use their internal account to sign in to NUCLEUS from the outside.

To sign in to NUCLEUS:

  • Click on the Sign In button in the top right-hand corner of any NUCLEUS page.
  • Enter your NUCLEUS username and password and click the Sign In button below the form.

Your username and password will be verified. If they are correct, you will be signed in to your NUCLEUS Account.

Problems Signing In

Here are some common reasons why a sign-in attempt might fail:


The account credentials you have entered are incorrect: If your username and/or password are incorrect, the sign in attempt will fail. After 10 failed sign in attempts for a particular username, the account will be temporarily locked for twenty minutes. During this time it will not be possible to sign in, even with the correct credentials. This is done for security reasons, in order to discourage malicious attempts at password guessing. If you have forgotten your NUCLEUS username and/or password, see the instructions for Forgotten Account Credentials.


Your account has not been activated: If your NUCLEUS Account has not been activated, it will not be possible to sign in. See the instructions on Account Registration and Activation and confirm that you have activated your account.


Your password has expired: By default, your NUCLEUS password will expire every 390 days and must then be changed. See Password Expiration for more information.


Your account has been disabled: Accounts may be disabled for security reasons. If the sign in error message indicates that your account is disabled, please Contact Us.


Sign Out

If you have signed in to NUCLEUS from a shared or public computer, you should sign out of your account when you have finished using NUCLEUS. To do this, simply click on your name in the top right-hand corner of any page and select Sign Out from the drop-down menu.