Default Simple ? regarding kernel & system wipe.

When doing a system wipe in SafeStrap OR during a given ROM install, does it also wipe the kernel or is that on a separate partition and left alone?
Verizon Galaxy S4 w/ Safestrap Recovery v3.72 & ★[ROM][AUG 27][AROMA] Hyperdrive KK RLS18.1 `._ ║ Tweaks ★ w/ NC2 Bootloader -On Stock Side!...

Gear w/ Tizen NE9-Rooted

Asus Transformer TF300T : ROM★★★TF300 KitKat 4.4.4-CROMBi-kk-RC3.1-Sep 7★★★