WordPress at a glance
action is not described

wp_create_nav_menu action-hook . WP 3.0.0

Fires after a navigation menu is successfully created.

Usage

add_action( 'wp_create_nav_menu', 'action_function_name_2241', 10, 2 );
function action_function_name_2241( $term_id, $menu_data ){
	// action...
}
$term_id(int)
ID of the new menu.
$menu_data(array)
An array of menu data.

Where the hook is called

wp_update_nav_menu_object()
wp-includes/nav-menu.php 356
do_action( 'wp_create_nav_menu', $_menu['term_id'], $menu_data );

Where the hook is used (in WP core)

Does not used.