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][JULY 4] Hyperdrive RLS17.1 KitKat `._ ║Hyperdrive Tweaks ║ Ultimate Customization ║ On-the-Fly Theming ★ w/ NC2 Bootloader -On Stock Side!...

Gear w/ Tizen NE9-Rooted

Asus Transformer TF300T : ★★★[TF300 KitKat 4.4.4][CROMBi-kk][F2FS | DATA2SD | ROM2SD | CM11 ][JULY 16]★★★