OSPF ADV Router is not-reachable

Hello friends,

I'm working on OSPF in these days and I don't undertand this thing:

I've a stable topology and I've one router (R3) that is my exit point for
my nssa area..
R3 indeed is configured as nssa no-summary.
And in the routers in this area (it's area2) get him as only summary LSAs.

                Summary Net Link States (Area 2)

Link ID ADV Router Age Seq# Checksum
0.0.0.0 150.1.3.3 1091 0x80000001 0x00BED9

If now I decide to kill R3 (shut all interfaces) and even do a clear of
ospf process, I still see the summary in the ospf database.

If then I check the LSA1 on in it I see ADV Router is not-reachable.

Rack1SW1#show ip ospf database router 150.1.3.3

  Adv Router is not-reachable
  LS age: 2292

I don't understand the reason it's still there. Should't be flushed? and
why by design it's not?

thank you

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