Nissan Motor Co. is set to adopt a new governance structure meant to prevent the recurrence of a concentration of power in the hands of a single executive.

For the past three months, an external panel has been working on recommendations following the arrest of former Chairman Carlos Ghosn on charges of financial wrongdoing. The committee's seven members will issue their findings later Wednesday, the 20th anniversary of the Japanese carmaker's alliance with Renault SA that brought the executive to Nissan.

Once Nissan's board accepts the measures, it will have a governance structure that calls for decision-making based on consensus instead of the whim of one person. Among the panel's proposals may be a recommendation to create separate governance committees to oversee nomination, audit and remuneration, with the majority of each body made up by independent directors, a person with knowledge of the proposals has said.