\section{Mission Lifetime \& Storage}
\label{sec:mission}

This section contains the \ac{ATHENA} mission lifetime and storage requirements.

\subsection*{R-AHEPaM-012: In-orbit lifetime}
\label{req:R-012}
The \ac{AHEPaM} shall be compatible with an overall in-orbit lifetime of 4.25\,years.

\paragraph{Justification:} ConOps part B MBD [DDF\_1.0]

\paragraph{Verification:} Design/Analysis

\paragraph{Comments:} Four years nominal mission plus 3\,months for \ac{LEOP}, transfer, and commissioning.

\paragraph{CAU Response:} OK

\subsection*{G-AHEPaM-011: In-orbit lifetime}
\label{req:G-011}
The \acs{AHEPaM} should be compatible with an overall in-orbit lifetime of 5.25\,years.

\paragraph{Justification:} ConOps part B MBD [DDF\_1.0]

\paragraph{Verification:} Design/Analysis

\paragraph{Comments:} This is a goal. Ten-year lifetime for consumables does not apply here.

\paragraph{CAU Response:} OK, AHEPaM has no consumables.


\subsection*{R-AHEPaM-013: Storage}
\label{req:R-013}
The \acs{AHEPaM} shall be compatible with a storage duration of 2\,years.

\paragraph{Justification:} To provide schedule robustness against delays.

\paragraph{Verification:} Design/Analysis

\paragraph{Comments:} This is a goal. Ten-year lifetime for consumables does not apply here.

\paragraph{CAU Response:} Storage of AHEPaM must be in a clean and purged environment. Purge requirements are \acs{TBD}.