It's in Step:
*STEP
*RANDOM RESPONSE
5,1E3,20,,1
*modal damping, structural
1,10,0.1
*BASE MOTION,DOF=2,LOAD CASE=1
*CORRELATION,PSD=BASE,TYPE=UNCORRELATED
1,1.
*EL PRINT,FREQUENCY=20
SF,
*MODAL PRINT,FREQUENCY=20
GU,
*EL FILE,FREQUENCY=20,ELSET=test
SF,
*MODAL FILE,FREQUENCY=20
GU,
*NODE FILE,FREQUENCY=1
U,
*ELEMENT OUTPUT
RMISES,
*END STEP