tf.set_random_seed doesn't seem to set the seed correctly

I encountered a problem that tf.set_random_seed is unable to generate a repeatable value when programming using Tensorflow on python. To be specific,

import tensorflow as tf
sd = 1
tf.set_random_seed(seed = sd)

tf.reset_default_graph()
sess = tf.InteractiveSession()
print(sess.run(tf.random_normal(shape=[1], mean=0, stddev=1)))

the code above outputs [1.3086201]. Then I ran the whole piece of code again, it doesn't outputs the expected value [1.3086201] but gives a new [-2.1209881].

Why would this happen and how to set a Tensorflow seed?