Date: Thu, 19 Sep 1996 12:41:22 X-Listprocessor-Version: 8.0 -- ListProcessor(tm) by CREN Status: R 18 Sep 1996 (Reuter) - Experts said Wednesday that abnormal readings in the ``sarcophagus'' housing the Chernobyl nuclear plant's ruined fourth reactor posed no immediate threat but stressed that the cracking structure had to be replaced. In Vienna, Ukraine's top negotiator on closing Chernobyl acknowledged the increase of neutron activity inside the sarcophagus which was hurriedly erected after the fire and explosion at the plant 10 years ago. 18 Sep 1996 (Reuter) - Russia and the United States agreed late Tuesday on practical steps to begin inspecting the Russian Federation's nuclear arsenal, the International Atomic Energy Agency (IAEA) said Wednesday. IAEA spokesman Hans Meyer told Reuters the Russian Federation had agreed to place fissile material -- uranium and plutonium stocks -- under IAEA inspection, but the amount had not been specified.