Black students stormed three primary schools in a South African township yesterday and chased out pupils ignoring a new boycott of classes, police in Cape Town reported.

No casualties were reported. Teaching at the three schools in Langa township left after the disorders, police said. The boycott, to protest the South African government's education policy, was called on Sunday at a mass meeting of teenage students from the Cape townships.

They decided to reimpose a ban begun last June after an outbreak of antigovernment rioting in which up to 500 blacks have died. The boycott was extended to primary schools.

In Lukasa, Zambia, leaders of the African National Congress of South African National Congress of South Africa said that South African forces planned "a massive military operation" on Thursday to destroy black dissent.

The liberation movement, banned in South Africa, called on "the revolutionary working classes" to counter any such operations with industrial action. The organization said it had been reliably informed the black African townships would be sealed off during the operations, "aimed at the eventual destruction of the determined resistance."

Meanwhile, South African federal and provincial authorities and Anglican officials authorities and Anglican officials said they had agreed to give further joint consideration to the racial integration of Anglican church schools.

The Anglicans have applied for permission to integrate their schools, unlike the Roman Catholic church, which integrated several of its parochial schools two weeks ago without seeking government authority.

In another southern African development, Rhodesian security officials said that Mozambique government troops opened fire with mortars against a police post in southeastern Rhodesia Monday night.

A Rhodesian communique said the shells caused "no damage and there were no security force casualties." It added that "retaliatory action was taken," but gave no further details.

British negotiator Ivor Richard, whose mission to negotiate a peaceful Rhodesian settlement failed, left Africa for home. Richard and British Foreign Secretary Anthony Crosland are to meet today with the new U.S. ambassador to the U.S. ambassador to the United Nations, Andrew Young, who is going to Africa in another attempt to reach a Rhodesian solution.

At the United Nations, the Organization of African Unity said it wished former Georgia congressman Young "all success in his new assignment as well as a fruitful visit to Africa." The OAU said it hoped Young's appointment will "open a new era of improved relations between the United States and Africa."