ZFS destroy problem

I recently rebuilt a Solaris 10 server which was previously using a ZFS root, it has now being rebuilt with a SVM configuration although the zpool configuration still exists and I cannot remove it has anyone ever seen the problem before? 

** Current SVM configuration **

metastat -p
d0 -m d4 d5 1
d4 1 1 c1t0d0s0
d5 1 1 c1t1d0s0
d1 -m d2 d3 1
d2 1 1 c1t0d0s1
d3 1 1 c1t1d0s1

---

** Previously configured pool **

zpool import
  pool: rpool
    id: 16545271276370355873
 state: ONLINE
action: The pool can be imported using its name or numeric identifier.
config:

        rpool         ONLINE
          mirror-0    ONLINE