UNITED NATIONS (Reuters) - Iran's plans to build 10 nuclear enrichment plants are unacceptable and may lead the international community to ratchet up the pressure on Tehran to halt the program, the U.S. envoy to the United Nations said on Monday. "We view the Iranian announcement, if it is in fact accurate and implemented, that they intend to build 10 additional facilities as completely inappropriate and further isolating Iran from the international community," Ambassador Susan Rice told reporters. Iran announced on Sunday that it intends to build 10 uranium enrichment plants in a major expansion of its atomic program, just...