MIL-HDBK-817, MILITARY HANDBOOK: SYSTEM DEVELOPMENT RADIATION HARDNESS ASSURANCE (08 FEB 1994)., The document is intended to address the planning, hardening, and management approaches required at the system level to ensure that the system level to ensure that the system is produced in compliance with survivability requirements. Provide guidance in defining HA activities commensurate with the threat nuclear weapon and space radiation environment and with the concept of balanced hardening to all hostile environments.