RAW disposal points

The main radioactive waste disposal points for accident waste are the Buriakovka, Podlesny and III line of ChNPP sites. These three near-surface disposal sites were established after the accident to dispose of RAW from remediation actions carried out during the first year following the accident. These sites were chosen and designed for the disposal of higher level acci­dent waste than the RAW located in the temporary RAW store points.

Buriakovka, built in 1987, is the only disposal facility currently in opera­tion in the ChEZ. It comprises 30 trenches covered with a 1 m clay layer (see Fig. 11.4). Up to 590,000 m3 of RAW has been disposed of, with a total

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radioactivity of 2.5 x 1015Bq of solid short-lived low and intermediate level waste. It consists of metal, soil, sand, concrete and wood contaminated with 90Sr, 137Cs, 134Cs, 238,239,240Pu, 154,155Eu and 241Am.

The Podlesny vault-type disposal facility was commissioned in December 1986 and closed in 1988. The facility was designed for the disposal of HLW with a dose rate 0.1 m from the surface in the range of 0.05-2.5 Gy h-1. The total RAW volume of 11,000 m3 of building material, metal debris, sand, soil, concrete and wood was placed in two vaults. The disposal facility was covered with concrete at its closure. In 1990 the estimated total radioactivity of the disposed waste was 2,600TBq.

The III line of ChNPP vault-type facility was based on reconstructed facilities of the unfinished units 5 and 6 at the ChNPP site. This facility was in operation from October 1986 until 1988 and was designed for low and intermediate level waste corresponding to dose rates up to 0.01 Gy tr1 at 0.1 m from the surface of the waste container. More than 26,200 m3 of solid waste with a total activity of 4 x 1014 Bq was disposed of in 18,000 containers and later covered with sand and clay. This waste is mainly sand, concrete, metal, construction material and bricks. Due to the high level of groundwa­ter at different periods of the year, the facility is flooded 0.5-0.7 m above its bottom.

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