Agence France-Presse: Japan’s major nuclear reactor manufacturers have begun developing small nuclear power systems for both developed and emerging countries, a report said on Saturday. Toshiba Corp. is developing an ultra-compact reactor with an output of about 10,000 kilowatts and has started procedures for approval in the United States, the Nikkei business daily said. The new reactor, the Toshiba 4S, is designed to minimise the need for monitoring and maintenance, with an automatic shutdown …