重要厂用水是个开式系统，从环境取水，用完后排放回环境。

The ERCW is an open system, using water from the environment and discharge back to the environment.

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非重要厂用水系统是非安全系统，用于汽机厂房和辅助厂房内非安全负荷的热量导出。

The Raw Cooling Water system is non-essential system which is provides for removal of heat from turbine building loads, as well as some non-essential loads in the auxiliary building.

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另一路的备用水来自原水系统(或称为厂用水)，当需要时可以不间断地向辅助给水系统供水。

An unlimited backup water supply, essential raw cooling water system (or called service water system) is supplied to the auxiliary feedwater system.

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