[routing-wg]intra-system private addresses

I am a new member to this list, so apologies if this question has come 
up before.

I was wondering if there are any IPv4 addresses reserved for 
communication within one logical system.  For example, a system (router 
for example) with multiple slot cards may require one slot card to 
communicate via IP directly with another slot card, and  even route 
traffic between the cards.  Traffic to these destinations will always 
originate from within the logical system and will never leave the 
logical system.  The system itself could be modular, and be built from 
several components.

Is there any ip-address range reserved for this?  I took a look at RFC 
3330, but it's not obvious what could be used.

Using the addresses reserved for private networks (10.0.0.0/8, 
172.16.0.0/16, and 192.168.0.0/16 etc.) is not attractive because there 
could be a large number of components and we do not want to preclude use 
of these addresses in the rest intranet.

Thanks in advance.
Allwyn.