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What specifically must be done to Human Rate the Interim Cryogenic Propulsion Stage (ICPS) to fly humans on Exploration Mission 1 of SLS?

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Compliance is mandatory!

Human Rating Requirements for Space Systems

It's long, even with the rationale scraped out, but here you go.

3.2 System Safety Requirements

3.2.1 The space system shall provide the capability to sustain a safe, habitable environment for the crew (Requirement 58503).

3.2.2 The space system shall meet probabilistic safety criteria derived from the Agency-level safety goals and safety thresholds with a specified degree of certainty (Requirement).

3.2.3 The space system shall provide failure tolerance to catastrophic events, with specific levels of failure tolerance and implementation (similar or dissimilar redundancy) derived via an integration of the design and safety analysis (per the requirement in paragraph 2.3.7.1) (Requirement).

a. Failure of primary structure, structural failure of pressure vessel walls, and failure of pressurized lines are excepted from the failure tolerance requirement provided the potentially catastrophic failures are controlled through a defined process in which approved standards and margins are implemented that account for the absence of failure tolerance.

b. Other potentially catastrophic hazards that cannot be controlled using failure tolerance are excepted from the failure tolerance requirements with concurrence from the Technical Authorities provided the hazards are controlled through a defined process in which approved standards and margins are implemented that account for the absence of failure tolerance.

3.2.4 The space system shall provide the failure tolerance capability in 3.2.3 without the use of emergency equipment and systems (Requirement 58557).

3.2.5 The space system shall be designed to tolerate inadvertent operator action (minimum of one inadvertent action), as identified by the human error analysis (paragraph 2.3.11), without causing a catastrophic event (Requirement 58559).

3.2.6 The space system shall tolerate inadvertent operator action, as described in 3.2.4, in the presence of any single system failure (Requirement 58561).

3.2.7 The space system shall provide the capability to mitigate the hazardous behavior of critical software where the hazardous behavior would result in a catastrophic event (Requirement 58563).

3.2.8 The space system shall provide the capability to detect and annunciate faults that affect critical systems, subsystems, and/or crew health (Requirement 58569).

3.2.9 The space system shall provide the capability to isolate and/or recover from faults identified during system development that would result in a catastrophic event (Requirement 58572).

3.2.10 The space system shall provide the capability to utilize health and status data (including system performance data) of critical systems and subsystems to facilitate anomaly resolution during and after the mission (Requirement 58574).

3.2.11 The crewed space system shall provide the capability for autonomous operation of system and subsystem functions which, if lost, would result in a catastrophic event (Requirement 58576).

3.2.12 The space system shall provide the capability for the crew to readily access equipment involved in the response to emergency situations and the capability to gain access to equipment needed for follow-up/recovery operations (Requirement 58578).

3.3 System Control Requirements - General

3.3.1 The crewed space system shall provide the capability for the crew to monitor, operate, and control the crewed space system and subsystems, where:

a. The capability is necessary to execute the mission; or

b. The capability would prevent a catastrophic event; or

c. The capability would prevent an abort (Requirement).

3.3.2 The crewed space system shall provide the capability for the crew to manually override higher level software control/automation (such as automated abort initiation, configuration change, and mode change) when the transition to manual control of the system will not cause a catastrophic event (Requirement 58586).

3.3.3 The space system shall provide the capability for humans to remotely monitor, operate, and control the crewed system elements and subsystems, where:

a. The remote capability is necessary to execute the mission; or

b. The remote capability would prevent a catastrophic event; or

c. The remote capability would prevent an abort (Requirement 58598).

3.4 System Control Requirements - Human-Rated Spacecraft

3.4.1 The crewed space system shall provide the capability for the crew to manually control the flight path and attitude of their spacecraft, with the following exception: during the atmospheric portion of Earth ascent when structural and thermal margins have been determined to negate the benefits of manual control (Requirement).

3.4.2 The crewed spacecraft shall exhibit Level 1 handling qualities (Handling Qualities Rating (HQR) 1, 2 and 3), as defined by the Cooper-Harper Rating Scale, during manual control of the spacecraft's flight path and attitude (Requirement).

3.5 System Control Requirements - Proximity Operations with Human-Rated Spacecraft

3.5.1 The space system shall provide the capability for the crew to monitor, operate, and control an uncrewed spacecraft during proximity operations, where:

a. The capability is necessary to execute the mission; or

b. The capability would prevent a catastrophic event; or

c. The capability would prevent an abort (Requirement 58604).

3.5.2 The crewed space system shall provide the capability for direct voice communication between crewed spacecraft (2 or more) during proximity operations (Requirement 58607).

3.6 Crew Survival/Abort Requirements

3.6.1 Earth Ascent Systems

3.6.1.1 The space system shall provide the capability for unassisted crew emergency egress to a safe haven during Earth prelaunch activities (Requirement 58611).

3.6.1.2 The space system shall provide abort capability from the launch pad until Earth-orbit insertion to protect for the following ascent failure scenarios (minimum list):

a. Complete loss of ascent thrust/propulsion (Requirement 58613).

b. Loss of attitude or flight path control (Requirement 58614).

3.6.1.3 The crewed space system shall monitor the Earth ascent launch vehicle performance and automatically initiate an abort when an impending catastrophic failure is detected (Requirement 58616).

3.6.1.4 Earth Ascent Abort

3.6.1.4.1 The space system shall provide the capability for the crew to initiate the Earth ascent abort sequence (Requirement 58619).

3.6.1.4.2 The space system shall provide the capability for the ground control to initiate the Earth ascent abort sequence (Requirement 58620).

3.6.1.5 If a range safety destruct system is incorporated into the design, the space system shall automatically initiate the Earth ascent abort sequence when range safety destruct commands are received onboard, with an adequate time delay prior to destruction of the launch vehicle to allow a successful abort (Requirement 58622).

3.6.2 Earth Orbit Systems

3.6.2.1 The crewed space system shall provide the capability to autonomously abort the mission from Earth orbit by targeting and performing a deorbit to a safe landing on Earth (Requirement 58625).

3.6.3 Earth - Lunar Transit and Lunar Orbit Systems

3.6.3.1 The crewed space system shall provide the capability to autonomously abort the mission during lunar transit and from lunar orbit by executing a safe return to Earth (Requirement 58627).

3.6.4 Lunar Descent Systems

3.6.4.1 The crewed space system shall provide the capability to autonomously abort the lunar descent and execute all operations required for a safe return to Earth (Requirement 58629).

3.6.5 Lunar Surface Systems

3.6.5.1 The space system shall provide the capability for the crew on the lunar surface to monitor the descent and landing trajectory of an uncrewed spacecraft and send commands necessary to prevent a catastrophic event (Requirement 58632).

3.6.6 Lunar Ascent Systems

Reserved for a future version of the NPR.

3.6.7 Earth Reentry Systems

3.6.7.1 The crewed space system shall provide the capability for unassisted crew emergency egress after Earth landing (Requirement 58636).

3.6.7.2 The crewed space system shall provide a safe haven capability for the crew inside the spacecraft after Earth landing until the arrival of the landing recovery team or rescue forces (Requirement 58638).

3.6.7.3 The space system shall provide recovery forces with the location of the spacecraft after return to Earth (Requirement 58640).

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  • $\begingroup$ Thank you I had just found that same link in a previous question in Stack Exchange from year ago What I was looking for was because -in the NASA teleconference today (2/24/17) William Gerstenmaier of NASA mentioned to human rate for the EM 1 it would take a "significant" amount of money and budget to do the human rating work on theInterim Cryogenic Propulsion Stage of the SLS after hearing this I was curious what specific work or changes need to be done $\endgroup$ – Chip Snyder Feb 24 '17 at 23:04
  • $\begingroup$ Yeah, these are the requirements. What the design will be...we don't know yet. $\endgroup$ – Organic Marble Feb 24 '17 at 23:08

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