Thank you for your interest in the GRS-Codes!

To obtain a code or a new code version, you have to act in accordance with the process described below:

First Step:

In order to start the licensing process, could you please send an official request to Dr. Andreas Schaffrath (please send a copy of your request to

Dr. Andreas Schaffrath
Head of Reactor Safety Research Division
Gesellschaft fuer Anlagen- und Reaktorsicherheit gGmbh
P.O. Box 1121
85738 Garching

 The following information is needed:

  • a short description of the intended use of the code,
  • references to co-operations with GRS - if applicable,
  • do you already have some knowledge regarding the use of the requested codes?  - Please let us know.
  • official contact information: company address, phone-no., e-mail, etc.
  • company profile (pdf), only demanded from organizations that request our codes the first time

Second step:

This step is only required for organisations based in countries outside the European Union.

Regarding your request for the GRS computer codes (e.g. COCOSYS, ATHLET, ATHLET-CD, ATLAS, AC²), we have to apply for an Export License at the Federal Office for Economic Affairs and Export Control (BAFA) of Germany. Here we will need an End-Use-Certificate (EVE) or an Importer Statement on End-User and End-Use of the requested codes or both documents.

On receipt of your request, we will send you the End Use Certificate (EVE) draft.

Third step:

Sign the documents needed for the code transfer:

  • Software License Agreement for all codes
  • Code Certificate and the additional arrangement for each software and version
  • Arbitration Agreement (for all countries except Germany)
  • Training or Service/Support contract (for this matter, we will send you an offer in a separate e-mail)

We will send you all these documents when we receive your official request.

Last step:

In case you are already running an older code version, please fill in the respective application report (only applicable if the yearly user feedback has not been provided):

Once the licencing process is successfully completed, you will be informed that the code is available for download from the User Area.

The GRS User Area is restricted to registered program users. Access requires a valid authorization. Usually, one user ID is provided for each organization, derived from their internet address (e.g. In addition, one email address per company is required to which updates in the User Area will be automatically sent. This might be the email address of a member of staff (who should forward the emails to the colleagues) or a dedicated address from where incoming mail is automatically forwarded to the code users within the organization.

In case of any questions regarding the code transfer, please contact