Why is there no Tachnun said in the month of Nissan?
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MB: 429(2) Twelve Nesiyim brought korbonos for twelve days and for each it was Yom Tov on their day, Erev Pesach, Pesach and Isru Chag added together gives a majority of the month in at least partial Kedushah, therefore the whole month is considered Kodesh.
The gemara in Menochos 65a says the the first eight days were designated as a celebration for the re-establishemnet of the Tomid at the time of the Sadduccees and no fasting was permitted on these days. (Be'er Haitaiv)