from Doc ID: 119119.1
* Do NOT use Expdp/Impdp when going to (AL32)UTF8 or a other multibyte
characterset on ALL 10g versions lower then 10.2.0.4 (including 10.1.0.5).
Also 188.8.131.52 is affected.
It will provoke data corruption unless you applied Patch 5874989 on the
impdp side, this is caused by the impdp Bug 5874989. Expdp is not affected.
The "old" exp/imp work fine. This problem is fixed in the
10.2.0.4 and 184.108.40.206 patch set.
All existing patches for this bug are found here:
For 10.1.0.5 and 220.127.116.11 you can ask a backport for Bug 5874989
if there is not yet a patch for your version/platform.