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Neil
NWChem does use a grid pruning approach pretty similar to what other LCAO DFT codes are using. Some good references for this topic are
C.W. Murray, N.C. Handy, and G.J. Laming, Quadrature schemes for integrals of density functional theory, Mol. Phys. 78 (1993) 997, doi:10.1080/00268979300100651.
P.M.W. Gill, B.G. Johnson, and J.A. Pople, A standard grid for density functional calculations, Chem. Phys. Lett. 209 (1993) 506-512, doi:10.1016/0009-2614(93)80125-9.
O. Treutler and R. Ahlrichs, Efficient molecular numerical integration schemes, J. Chem Phys 102 (1995) 346-354 doi:10.1063/1.469408
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