TNAG-1506-FCO40-2064-Guangdong-nuclear-power-station-project-at-Daya-Bay-safety-c-1986 — Page 160

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22 Winds

Siting

Local topography, including hills, housing and vegetation

The wind rose and its variation with wind strength

Historical wind speed and local estimates of the wind hazard in terms of speed and exceedence frequency

The gust characteristics of extreme wind events for the site

Correlations between extreme winds and extreme sea-levels, rainfall and temperatures.

2b

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Winds Design

The level and exceedence frequency of the design basis wind speeds

The design codes and standards used for structural qualification for wind loading

The protection provided against wind-driven missiles and the wind-driven missiles considered within the design basis

Any significant design departures (from the usual French 900 MWe PWR design) which influence the plant protection from wind loads (either to achieve an enhancement or, perhaps unintentionally, to produce some degradation).

За

Flooding

Siting

Site topography in relation to mean sea level

Historical flooding and local estimates of marine and rainfall flooding in terms of water level, and rainfall amounts/duration, and exceedence frequency

Local rivers and historical river flooding data in terms of flood level and exceedence frequency

Existing or proposed dams on rivers whose flood plain could affect the site

Local water drainage patterns and flow rates.

Correlations between extreme rainfall and extreme sea-level and extreme temperatures

Regional historical data of tsunami strengths and occurrence frequencies.

36

Flooding Design

The level and exceedence frequency of the design basis external flood

The design codes, standards and guidelines used for provision of