Oracle Database Discussions

Hi,
I'm working on an Oracle Database 11g Release 11.1.0.6.0 - 64bit Production With the Real Application Clusters option.

I need to use some cyrillic chars as column name in a file written from a PL/SQL block.
Using SQLDeveloper I can see right chars into package body:

    export_file := UTL_FILE.FOPEN('DIR_EXPORT','driving_profile_'||in_id_extraction||'_'||to_char(id_date_process,'yyyymmdd')||'.csv','W');
    UTL_FILE.PUT_LINE(export_file,
         'Дата;'||
         'Временной интервал;'||
         'Номерной знак;'||
         'VIN;'||
         'Код локации;'||
         'Пробег, км;'||
         'в т.ч. с превышением лимита скорости для данной территории;'||
         'Время в движении, часы;'||
         'в т.ч. с превышением лимита скорости для данной территории;'||
         'Средняя скорость, км/час;'||
         'Макс.скорость, км/час;'
               );

but the resulted file show this stuff:

Дата;Временной инÑ......

My client nls_lang is AMERICAN_AMERICA.AL32UTF8

The database server one is:

nls_language  AMERICAN

SQL> select value from nls_database_parameters where parameter = 'NLS_CHARACTERSET';

VALUE
--------------------------------------------------------------------------------
AL32UTF8

SQL> select value from nls_database_parameters where parameter = 'NLS_NCHAR_CHARACTERSET'; 

VALUE
--------------------------------------------------------------------------------
AL16UTF16

I also tried to insert a string in a test table, and from SQL Developer I can see right chars:

insert into t_russo values ('Дата');

select * from t_russo;

TEXT                                                                                                                                                                                                                             
------------------
Дата     

But from SQL Plus from node1 I see this:

sqlplus dispatch/disp1

SQL*Plus: Release 11.1.0.6.0 - Production on Mon Mar 14 14:49:29 2011

Copyright (c) 1982, 2007, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g Release 11.1.0.6.0 - 64bit Production
With the Real Application Clusters option

SQL> select * from t_russo;

TEXT
--------------------------------------------------------------------------------
????

SQL> quit                               

Does anyone suggest me something to achieve my goal?

Thanks in advance,
Samuel