https://www.ibm.com/docs/en/ims/15.5.0?topic=parameters-tcoracf-parameter-procedures
IMS 15.5 - System definition - TCORACF= parameter for procedures
Use the TCORACF= parameter in procedure to specify whether (Y) or not (N) RACF should be called to perform an authorization check of commands from a TCO...
imssystemdefinitionparameterprocedures