scope:

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 reflect updates to configuration and the associated hardness assurance/maintenance performed to carry out those configuration changes. While the Air Force customarily has performed this function, if the function is contracted, this DID must be tailored for use in that type of contract using the content required in the CDR, PCA, and production types of updates.

The nature of the requirements for ICBMs will lead to a need for classification of at least part of the NH&S DAR. When classification is needed, the appropriate program security classification guide shall be used to classify the document appropriately. Use of a separate classified volume (or volumes) as a part of the overall "book" is encouraged in order to allow for easier distribution and handling of the unclassified content.

This DID supersedes DI-ENVR-80266.