  We present the implementation of a spectral kurtosis based Radio Frequency
Interference detection system on the CHIME instrument and its reduced-scale
pathfinder. Our implementation extends single-receiver formulations to the case
of a compact array, combining samples from multiple receivers to improve the
confidence with which RFI is detected. Through comparison between on-sky data
and simulations, we show that the statistical properties of the canonical
spectral kurtosis estimator are functionally unchanged by cross-array
integration. Moreover, by comparison of simultaneous data from CHIME and the
Pathfinder, we evaluate our implementation's capacity for interference
discrimination for compact arrays of various size. We conclude that a spectral
kurtosis based implementation provides a scalable, high cadence RFI
discriminator for compact multi-receiver arrays.
