Download e-book for kindle: The Safety of nuclear fuel cycle intermediate storage by OECD Nuclear Energy Agency

By OECD Nuclear Energy Agency

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Extra info for The Safety of nuclear fuel cycle intermediate storage facilities : proceedings of the topical meeting, Newby Bridge, United Kingdom, 28-30 October 1997, hosted by British Nuclear Fuels, plc

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In that case, it was likely that the two internal isolation valves were also closed and it was assumed that the IC would not function with the external isolation valves open. Later, the operators closed one of the IC external isolation valves at 18:25 amid concern over the decreasing water level on the body side the condenser but re-opened it again at about 21:30. Such series of operations, however, were not communicated to the Nuclear Emergency Response Headquarters, and those at the Fukushima Daiichi and TEPCO head office believed that the IC was operating normally.

It is also assumed that consequently, the molten core concrete interaction (MCCI) was suppressed and the molten fuel remained at about 70 cm in the pedestal floor which was eroded (Fig. 4). The containment vessel vent was planned concurring with the injection. As supplies of AC power and compressed air were lost, two valves had to be manually opened on site (Fig. 5). The MO valve on the second floor of the reactor building could be manually opened, but to open the AO valve, access to the basement torus room was required.

If the water level exceeds the nozzle position, two-phase flow came out of the main steam system and drove the RCIC turbine. It is assumed that for the RCIC, the operational condition was inefficient, whereby the water-injection flow was smaller than the rated value, and the discharge of the two-phase flow was balanced with the water injection by the RCIC. Conversely, from the nuclear power reactor, the two-phase flow, which had a larger enthalpy per unit volume, flowed out from the main steam pipe.

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The Safety of nuclear fuel cycle intermediate storage facilities : proceedings of the topical meeting, Newby Bridge, United Kingdom, 28-30 October 1997, hosted by British Nuclear Fuels, plc by OECD Nuclear Energy Agency


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