The ue.NULRB parameter determines the waveform bandwidth (not the frequency). Set it to 50 for 10MHz. The generated waveform is always at baseband.
The srs.BWConfig and srs.BW parameters define the C_SRS and B_SRS parameters respectively. Those values are used to define the SRS bandwidth (mSRS,b) as well as the frequency index position (Nb) as per table 5.5.3.2-2:
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