scope:

Purpose and Scope

This requirements document is applicable to all batteries on crewed spacecraft, including vehicle, payload, and crew equipment batteries. It defines the specific provisions required to design a battery that is safe for ground personnel and crew members to handle and/or operate during all applicable phases of crewed missions, safe for use in the enclosed environment of a crewed space vehicle, and safe for use in launch vehicles, as well as in unpressurized spaces adjacent to the habitable portion of a space vehicle. The required provisions encompass hazard controls, design evaluation, and verification. The extent of the hazard controls and verification required depends on the applicability and credibility of the hazard to the specific battery design and applicable missions under review. Evaluation of the design and verification program results shall be completed prior to certification for flight and ground operations. This requirements document is geared toward the designers of battery systems to be used in crewed vehicles, crew equipment, crew suits, or batteries to be used in crewed vehicle systems and payloads (or experiments).

This requirements document also applies to ground handling and testing of flight batteries. Specific design and verification requirements for a battery are dependent upon the battery chemistry, capacity, complexity, charging, environment, and application. The variety of battery chemistries available, combined with the variety of batterypowered applications, results in each battery application having specific, unique requirements pertinent to the specific battery application. However, there are basic requirements for all battery designs and applications, which are listed in section 4. Section 5 includes a description of hazards and controls and also includes requirements.

The following definitions differentiate between requirements and other statements.

Shall: This is the only verb used for binding requirements.

Should/May: These verbs are used for stating non-mandatory goals or when used in the italicized text herein refer to best practice methods which can be construed as example methods for meeting the requirement it refers to.

Will: This verb is used for stating facts or declaration of purpose.

Section 6 includes chemistry-specific information. No requirements appear in that section, only best practices.

Shall requirements are summarized in Appendix E.

In keeping with the NASA standards template, italicized text is intended to indicate rationale, best practice examples, or guidelines; while the italicized text never includes the requirement, it often helps to convey the intent of the requirement.

In cases where a requirement includes associated italicized text and that text includes best practice, that best practice can be considered part of an accepted means to address the requirement. If other methods are used, rationale and supporting data demonstrating the adequacy of those methods should be presented and must be reviewed for adequacy by the program's technical team..