MIL-STD-1OOG
3.43 Nuclear Hardness Critical Item (HCI). A Nuclear HCI is an item of hardware or software that satisfies one or more of the following conditions:
a. Functionally required hardware (meaning hardware included in system design to satisfy any requirement other than nuclear hardening) whose response to the specified nuclear environments could cause degradation in system survivability unless additional provisions for hardness are included in the item specification, design, manufacture, item selection process, provisioning, configuration control, etc.
b. Functionality required hardware or software that inherently provides protection** for the system or any of its elements against the specified nuclear environments, and which if modified, removed or replaced by an alternate design could cause a degradation in system survivability.
c. Hardness dedicated hardware or software included in the system solely to achieve system nuclear survivability requirements.
d. Hardware items (at the level of application) to which a Hardness Critical Process (HCP) is applied.
e. A subassembly or higher level of assembly which contains one or more HCIs.
** (for example, the item was not designed for its nuclear weapon response but has the intrinsic capability to perform adequately in the specified nuclear environments. This definition includes items whose design is modified to provide for nuclear survivability of other items, but not to provide for their own survivability.)
3.44 Nuclear Hardness Critical Process (HCP). A Nuclear HCP is any fabrication, manufacturing, assembly, installation, maintenance and repair, or other process or procedure which implements a hardness design feature and satisfies system hardness requirements.
3.45 Observable Critical Item (OCI). An OCI is any part or material specifically designed, selected or qualified to meet specified observable requirements.
3.46 Observable Critical Process (OCP). An OCP is any fabrication, manufacturing, assembly, installation, maintenance and repair, or other process or procedure which implements an observable design and satisfies observable system requirements.
3.47 Original. The current design activity's full size reproducible drawing or digital data file(s)
on which is kept the revision record recognized as official.
3.48 Original date. A date that establishes the origination of the drawing and is retained throughout the life of the drawing for historical record purposes.
3.49 Original design activity (ODA). An activity (Government or contractor) having had responsibility originally for the design of an item and whose drawing number and CAGE Code is shown in the title block of drawings and associated documents.
3.50 Part. One piece, or two or more pieces joined together, which are not normally subject to disassembly without destruction or impairment of designed use. (Examples: transistor, composition resistor, screw, gear, transformer, milling cutter) See 3.7.1.
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