Mid — and long-term roadmap

With stable conditions in the reactors of the Fukushima Daiichi NPP achieved, TEPCO will continue to monitor the radiation levels in the plant and carry out mid — and long-term work to achieve the following targets [33]:

1. In 2012, processing facilities for multi-radioactive nuclides, which could not be removed by the current cesium adsorption units, were installed. With the sealing of the water leakage, the processing of the accumulated water will be accomplished within 10 years.

2. To mitigate seawater contamination, seawater purification continued to be operated until the end of 2012. Furthermore, a water shielding wall will be installed by 2014 to prevent local groundwater discharge into the ocean.

3. Removal of fuel from SF pools will commence within 2 years, in the sequence of units 4, 3, 1, and 2. Complete fuel removal for all units will take about 10 years. Fuel reprocessing and storing methods will also be studied during this period.

4. After fuel removal, the leftover fuel debris will also be removed in accordance with site conditions, safety requirements, and the develop­ment of remote control technologies. This removal will be initiated within 10 years and is expected to be completed after 20-25 years.

5. The reactor facilities of units 1-4 will also be demolished within 30 and 40 years.

6. Another significant target is the processing and disposal of the radioac­tive waste. By the end of 2012, an R&D plan for the post-accident waste was set up. The R&D programme includes, but is not limited to, waste identification, effective waste treatment and disposal methods, potential equipment/device development. At this stage, the complete disposal of the RAW is expected to be accomplished after 30-40 years.

The overall mid- and long-term roadmap published by TEPCO is summa­rized in Fig. 24.9.

Options for managing the corium product of the melted cores at Fuku — shima have been considered [6] incuding stabilizing the site by creating a protective sarcophagus as is being done at Chernobyl. However, an under­standing of the interaction between water and the corium with which it would undoubtedly come into contact must be developed if this option is eventually chosen.

Добавить комментарий

Ваш e-mail не будет опубликован. Обязательные поля помечены *