Maanshan Nuclear Power Plant
| Maanshan Nuclear Power Plant | |
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 Location of Maanshan Nuclear Power Plant in Taiwan
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| Official name | 馬鞍山核能發電廠 |
| Country | Republic of China |
| Location | Hengchun, Pingtung County |
| Coordinates | 21°57′30″N 120°45′5″E / 21.95833°N 120.75139°ECoordinates: 21°57′30″N 120°45′5″E / 21.95833°N 120.75139°E |
| Status | Operational |
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| Decommission date |
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| Owner(s) | Taipower |
| Operator(s) | Taipower |
| Nuclear power station | |
| Reactor type | PWR |
| Reactor supplier | Westinghouse Electric |
| Fuel type | UOX |
| Power generation | |
| Units operational | 2 × 951 MW |
| Make and model | General Electric |
| Nameplate capacity | 1,902 MW |
| Capacity factor | 90.0% |
| Annual gross output | 15,000 GW·h |
The Maanshan Nuclear Power Plant (馬鞍山核能發電廠 or 核三) is a nuclear power plant located near South Bay, Hengchun, Pingtung County, Taiwan. The plant is Taiwan's third nuclear power plant and second-largest in generation capacity. The expected lifespan of this plant is 60 years.
Each unit at Maanshan is a three-loop Westinghouse PWR with three Westinghouse type F steam generators. Each steam generator has 5626 U-bend tubes made of thermally treated Inconel 600 alloy. The power plant can generate 15 TWh of electricity per year.
On 7 July 1985 a turbine blade failure at Maanshan Unit 1 led to a fire and reactor trip. When the blades failed, the resulting turbine imbalance allowed hydrogen and seal oil to escape from the generator. It took approximately 2 hours for the fire to be extinguished, but no systems critical to safe operation and shutdown were affected. The subsequent repairs were so extensive that Unit 1 did not come back on-line for 11 months. The natural frequency of torsional vibration was 120 Hz, approximately twice that of the electrical frequency, so the resulting resonant vibration led to blade failure.
On 24 September 1988, one control rod assembly was found to be not fully inserted following a reactor trip at Unit 1. Subsequent rod drop tests showed the rod assembly stuck at or above the same not-fully-inserted position, leading to removal and examination of the rod assembly. The examination showed several rods were cracked, which were later determined to result from volumetric growth of the hafnium neutron absorber and differential thermal expansion (hafnium compared to the stainless steel rod cladding). Taipower later replaced all hafnium-containing rods with a different alloy to resolve the issue.
Unit 1 suffered a station blackout on 18 March 2001 when grid instability caused a loss of offsite power and both of the emergency diesel generator trains failed to start. Both units had tripped off-line the prior day due to instability in the 345 kV offsite power transmission line, caused by salt-bearing seasonal sea smog. The 4.16 kV essential bus was transferred to the 161 kV offsite power line, but the 161 kV line was lost soon afterwards. The "A" train emergency diesel generator started but was unable to supply power due to a bus grounding fault, and the "B" train diesel generator lost power to its exciter, resulting in a loss of power to both 4.16 kV essential busses lost power. Service to these busses was not restored for over two hours, when a swing diesel generator (shared between Units 1 and 2) was brought to service.
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