Secretary General Kurt Waldheim called South Africa's decision to take over administration of the port of Walvis Bay in Namibia (Southwest Africa) "unfortunate." It is the only deep-water port in the territory administered by South Africa under an old League of Nations mandate.

The United States also criticized the move as "untimely and unhelpful" since it comes as five Western powers and South Africa are negotiating Namibia's independence.

Meanwhile a South African judge has taken the new post of administrator general in the territory amid indications that South Africa's Prime Minister John Voster was moving away from an independence plan for Naminia worked out by a multiracial conference.

The plan has been rejected by the United Nations because it exludes the South-West Africa People's Organization (SWAPO) from political life and because it offers an ethnic rather than political solution.

In a related development South African police used dogs and clubs to break up large crowds of stone-throwing students in black townships at Bloemfontein in the second day of violence caused by protests against the black educational system. Several youths were arrested. In Johannesburg's black township, Soweto, the government completed the takeover of 40 secondary and high schools. More than 2,400 have been detained in Soweto since riots against the school system started there last year, according to South African officials.