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In this paper, which is the first in a series of papers associated withcataclysmic variables and related objects, we introduce the CATUABA code, anumerical machinery written for analysis of the MOCCA simulations, and showsome first results by investigating the present-day population of cataclysmicvariables in globular clusters. Emphasis was given on their properties and theobservational selection effects when observing and detecting them. In this workwe analysed in this work six models, including three with Kroupa distributionsof the initial binaries. We found that for models with Kroupa initialdistributions, considering the standard value of the efficiency of the commonenvelope phase adopted in BSE, no single cataclysmic variable was formed onlyvia binary stellar evolution, i. e., in order to form them, strong dynamicalinteractions have to take place. We show and explain why this is inconsistentwith observational and theoretical results. Our results indicate that thepopulation of cataclysmic variables in globular clusters is, mainly, in thelast stage of their evolution and observational selection effects candrastically change the expected number of observed cataclysmic variables. Weshow that the probability of observing them during the outbursts is extremelysmall and conclude that the best way of looking for cataclysmic variables inglobular clusters is by searching for variabilities during quiescence, insteadof during outbursts. For that, one would need a very deep observation whichcould reach magnitudes $\gtrsim$ 27 mag. Finally, we argue that cataclysmicvariables in globular clusters are not necessarily magnetic.

MOCCA-SURVEY database I. Accreting white dwarf binary systems in globular clusters -- I. cataclysmic variables -- present-day population