radiusd -X shows its usage for these ports:

Listening on auth address * port 1812 as server default
Listening on acct address * port 1813 as server default
Listening on auth address 127.0.0.1 port 18120 as server inner-tunnel
Opening new proxy address * port 1814
Listening on proxy address * port 1814

I see that port 18121 is used for status-server (described in /etc/raddb/sites-available/status file). Only Status-Server packets are processed in that port.

selinux-policy should allow binding radiusd to tcp ports 1812 and and 1813.

cat /etc/services | grep radius
...
radius          1812/tcp                        # Radius
radius          1812/udp                        # Radius
radius-acct     1813/tcp        radacct         # Radius Accounting
radius-acct     1813/udp        radacct         # Radius Accounting

I can add 'proto = tcp' to into listen section in /etc/raddb/sites-enabled/default
Start of radiusd service then fails because selinux doesn't allow name_bind to tcp port.

type=SYSCALL msg=audit(1404138922.748:304): arch=c000003e syscall=49 success=no exit=-13 a0=4 a1=7fffebd03520 a2=10 a3=7f2c0a0052e0 items=0 ppid=5964 pid=5967 auid=4294967295 uid=0 gid=95 euid=0 suid=0 fsuid=0 egid=95 sgid=95 fsgid=95 tty=(none) ses=4294967295 comm="radiusd" exe="/usr/sbin/radiusd" subj=system_u:system_r:radiusd_t:s0 key=(null)
type=AVC msg=audit(1404138922.748:304): avc:  denied  { name_bind } for  pid=5967 comm="radiusd" src=1812 scontext=system_u:system_r:radiusd_t:s0 tcontext=system_u:object_r:unreserved_port_t:s0 tclass=tcp_socket

You should also include port 2083 on TCP. TLS support in FreeRADIUS (used with RADSEC) uses TCP:2083. 

:-)

commit 2ce1bd7a87b91c53e47098f426a8d7ff04ff975a
Author: Miroslav Grepl <mgrepl>
Date:   Thu Sep 18 17:08:29 2014 +0200

    Add support also for tcp radius ports.

So we need to add types also for tcp/2083 and tcp/18120, right?

tcp/2083 yes, tcp/18120 no (you don't have a udp/18120 in this policy, do you?) 
AFAIK, port 18120 is open on UDP to localhost only.

I see

type=AVC msg=audit(12/12/2014 09:38:40.941:6592) : avc:  denied  { name_bind } for  pid=35091 comm=radiusd src=18120 scontext=system_u:system_r:radiusd_t:s0 tcontext=system_u:object_r:unreserved_port_t:s0 tclass=tcp_socket

Ahh, in that case... yes.

commit 40eef7dcea8bbbfde3d1334348d2852dcb7cad1b
Author: Miroslav Grepl <mgrepl>
Date:   Fri Jan 9 12:41:20 2015 +0100

    Update radius port definition to have also tcp/18121.

commit bab3360972b40d2e4053856dffdba3e59ed73e07
Author: Miroslav Grepl <mgrepl>
Date:   Fri Jan 9 12:32:29 2015 +0100

    Add 18120/tcp as radius port.

# seinfo --portcon=2083
	portcon tcp 2083 system_u:object_r:radsec_port_t:s0
	portcon tcp 1024-32767 system_u:object_r:unreserved_port_t:s0
	portcon udp 1024-32767 system_u:object_r:unreserved_port_t:s0
# sesearch -s radiusd_t -t radsec_port_t -A -C
Found 4 semantic av rules:
   allow radiusd_t port_type : tcp_socket { recv_msg send_msg } ; 
   allow radiusd_t port_type : udp_socket { recv_msg send_msg } ; 
ET allow nsswitch_domain port_type : tcp_socket { recv_msg send_msg } ; [ nis_enabled ]
ET allow nsswitch_domain port_type : udp_socket { recv_msg send_msg } ; [ nis_enabled ]

# 

The policy defines radsec_port_t, but does not allow name_bind or name_connect to it. That's interesting.

commit f98413d1a54c821d97b319a69378a2df37bab510
Author: Miroslav Grepl <mgrepl>
Date:   Tue Jan 20 19:49:44 2015 +0100

    Allow radius to bind radsec ports.

commit 4bda4dd357a4eaa2770fd09edad69fc5f872eb11
Author: Miroslav Grepl <mgrepl>
Date:   Wed Jan 28 08:21:31 2015 +0100

    Allow radiusd to connect to radsec ports.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2015-0458.html