Unipetrol decided to shut down operation of its petrochemical steam cracker (SC) unit. The unplanned shutdown is driven by technical difficulties with a steam pipe. Due to refinery products’ balance the SC shut down may further trigger some refinery units shut down as well. Unipetrol sees 2013 negative EBIT impact about 50 mln. CZK and may restart steam cracker in about 13 days. /slighlty NEGATIVE; Unipetrol is to release its 2Q13 results next Tuesday, JUL-23