Joint Institute for Power and Nuclear Research – Sosny | South Ukrainian NPP experts found the cause of deformation of the fuel assembly TVS-W

Joint Institute for Power and Nuclear Research – Sosny

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03.09.2012

South Ukrainian NPP experts found the cause of deformation of the fuel assembly TVS-W

Interdepartmental commission found cause strain was maintained on the South-Ukrainian NPP  (SU NPP) fuel assembly (FA) produced by «Westinghouse Electric» (TVS-W). This was announced on August 31, First Deputy Chairman of the State Nuclear Regulatory Inspectorate of Ukraine (SNRIU) Mikhail Gashev. “The findings of the first phase of examination, all that happened in the second and third blocks SUNPP due to design flaws”, – said M. Gashev, quoted by RIA “Novosti”. According to Deputy Chairman SNRIU this fact recognized by all the experts who participated in the work of the commission, including representatives of the «Westinghouse Electric». Among the major flaws FA-W in the preliminary report, the commission highlighted: the unreliability of spacer grids, bad design and bad design shank spring unit head assembly.

Currently, the Commission continues to work, the final report will be presented in SNRIU September 17, said M. Gashev. However, SNRIU allowed partial loading of the core in the second and third power SUNPP previously unloaded intact as American assemblies. “In particular, the second unit back loaded with 27 cartridges of 42 proposed for the post-combustion, everything else – is the Russian TVSA, including 58 fresh cassettes”, – M. Gashev. The following year, TVS fuel-W will be “completely unloaded from the core of the second unit and sent to the poster of research.” With regard to the third power SU NPP, in its core now left 66 assembly TVS-W.

In this case, the formation of the core fuel assemblies-W «in order to minimize the risks of its deformation was surrounded by a stable frame, made of Russian magazines,” said M. Gashev. The following year, in the second block SU NPP “clearly will be uploaded 30 U.S. assembly after three years.” For the remaining 36 tapes TVS-W decision will be made during the repair company in 2013. All the rest of the fuel on the block number 3 – it TVSA, including 48 fresh tapes. Deputy Head GIYARU also said that on the power unit № 5 Zaporozhye NPP or the power unit № 2 SU NPP fuel production «Westinghouse Electric» will not load. “It needs to be further developed,” – concluded M. Gashev. According to him, the preliminary amount of damage caused to NAEC “Energoatom”, estimated by experts at US $ 175 million.

Nuclear.Ru (www.nuclear.ru)

 

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