Nifty will be slightly gap up opening in today's session. The expected opening above the 18400 level and the 18400 to 18450 level is the consolidation range and if nifty breaks the 18450 level this level then the possible upside go up to 18550+ in today's session. in case nifty trades below the 18400 level than possible downside rally up to 100-200 points.