The Shanghai Nuclear Engineering Research and Design Institute (SNERDI) designed the CNP-300 for the CNNC. The design is a down-sized traditional two — loop pressurized water reactor design. The core consists of 121 fuel assemblies with a 15 X 15 array of zircaloy clad fuel pins. Two vertically mounted external reactor coolant pumps circulate the primary coolant between the reactor pressure vessel and the two vertical U-tube steam generators. Although initially designed for 300 MWe, subsequent units were upgraded in capacity to 325 and 340 MWe. Because the CNP — 300 uses a loop-type configuration, a large-break loss of coolant accident is possible and multiple safety systems are incorporated to mitigate its consequences, including high-pressure injection systems.

The first CNP-300 was constructed by the CNNC at the Qinshan Nuclear Power

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Plant site in China and was connected to the grid in 1991. Two subsequent units, Chashma 1 and 2, were constructed in Pakistan. Chashma 1 commenced operation in 2000. Units 3 and 4 are currently in design and construction phases. Key parameters and a representative graphic for the CNP-300 design are given in Figure 2.3. [3]