The inquiry is expected to report back by April, but Mr Kenrick said as far as TVNZ's news operations outside the scope of the investigation went, "I have no reason to believe there's any bias and I'm really confident that we're going to provide the market leading news and current affairs programmes off the back of that".
The inquiry was in its early days but would likely result in changes to conflict of interest rules for employees.
"We will probably need to be more robust in terms of how we identify political allegiances particularly within our news and current affairs areas but across the business as a whole."
However TVNZ was unlikely to ban membership of political parties by its employees.
"We're not in the business of censoring people or trying to dictate what their political preferences are but we need to have more robust declaration and awareness of that, and we probably will need to look at how we can manage the situation where we are aware."
In its existing rules for journalists TVNZ says it has "no wish to limit any person's freedom of association or ability to join a political party".
"But someone working in news or current affairs should ask the basic question: If this fact (party membership) became public, would our viewers regard the journalist involved as truly impartial? If there is any suggestion they would not, then it must be declared."