MCNP Guide
MCNP Installation
Obtaining MCNP and selecting your platform install guide
Obtaining MCNP
MCNP is export-controlled and distributed by the Radiation Safety Information Computational Center (RSICC) at Oak Ridge National Laboratory. Register at rsicc.ornl.gov with an institutional email, submit the required documents below, and download the approved package — processing typically takes 1–2 weeks.
Required documents
Export Control Form — signed compliance statement
Reference Letter — from advisor or supervisor
Institutional Proof — student ID or employment letter
Research Statement — brief description of intended use
Install Guides
Select your operating system for the full step-by-step guide, including system requirements, build instructions, cross-section data setup, and a verification test.
Linux
GCC / GFortran build with OpenMPI. Covers Ubuntu/Debian and CentOS/RHEL package installation, compile steps, cross-section data, and verification.
View Linux install guide →Windows
Visual Studio + Intel Fortran build with Microsoft MPI. Covers required software, nmake build process, cross-section data, and verification.
View Windows install guide →Keep your RSICC account credentials secure — MCNP licenses typically require annual renewal. For build or runtime errors after installation, see the Troubleshooting guide.