DATA ITEM DESCRIPTION
Title: Nuclear Hardness and Survivability (NH&S) Design Analysis Report
Number: DI-ENVR-80266A
AMSC Number:
F9757
AF-27
Limitation:
GIDEP Application: No
Project Number: ENVR-2015-004
Use/Relationship: This Data Item Description (DID) contains the format, content, and outline of
the schedule of delivery requirements for the NH&S Design Analysis Report (DAR) which is
produced as a result of tasking in 5.3.3.1.1, 5.3.4.1.3, and 5.3.4.1.4 of MIL-STD-1766C.
This DID is applicable to system development/modification contracts for operational
intercontinental ballistic missile (ICBM) hardware for which the contractor is required to
conduct an NH&S program. It can also be used for any effort on ICBM hardware that makes
changes to the design, thus creating a need for an updated NH&S DAR (change pages), such as
during sustainment activities of MIL-STD-1766C, section 5.5.
This report documents the methodology and results of the contractor’s activity to incorporate
specified nuclear hardness and survivability (NH&S) requirements into the design of each
configuration item (CI) and its elements. This report is used (1) by the procuring agency to
evaluate the degree to which the contractor has clearly demonstrated the hardware meets the
NH&S requirements; and (2) by the operating and supporting agency, to aid in the evaluation of
the hardness impact of planned redesign, modification, or upgrade actions, and to support the
purchase of spares, repair, and maintenance of hardness critical items.
The nature of the contract will be a factor in deciding which versions of the DAR should be
called for in the contract. For development phase, design review versions and physical
configuration audit (PCA) version apply. For production, a final production update version
applies. For long or continuous production, intermediate production updates may apply. The
design review version(s) of the NH&S DAR need to be continuously revised and modified as the
design progresses so that it is ready for release at each design review, at the PCA, and at the final
production version (near the end of production). This final version is then used to support the
logistics support agency’s implementation of its hardness maintenance responsibilities
throughout weapon system operational life. The requirements for all design review versions, the
PCA version, and the final production update version are the same except as noted below where
early versions are not required to have certain content completed. DAR preparation begins in
conjunction with preliminary design review (PDR) and may include interim versions prior to the
critical design review (CDR) version depending on length of contract and scope of the effort
involved.
A minimum of four versions of the DAR are needed during a program and the contract needs to
be prepared to require one at PDR, CDR, PCA, and a Production Update. After the Air Force
accepts the final program DAR, it needs to be continuously maintained as a ‘living’ document to
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