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Regional Basic Professional Training Course in Korea

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10.4.3.3. Canadian type NPP<br />

❙ 655 ❙<br />

10-A. Limit<strong>in</strong>g Conditions for Operation<br />

In the case of the CANDU type Wolsong unit 1, the Operat<strong>in</strong>g Policy and Pr<strong>in</strong>ciple<br />

(OP&P) that stated the LCOs was used as the technical specifications, when the NPP first<br />

<strong>in</strong>itiated commercial operations <strong>in</strong> 1983. However the OP&P was considered to make up<br />

for its contents <strong>in</strong> more detail. In the meantime, licensees should submit the operational<br />

technical specifications that describe the plant operation and security by the Atomic<br />

Energy Act amendment.<br />

Operational technical specifications by the Atomic Energy Act is used <strong>in</strong> Wolsong unit<br />

2,3 and 4 <strong>in</strong>stead of the OP&P. However, the contents of LCOs <strong>in</strong> the Wolsong unit 2,3,<br />

and 4 are week <strong>in</strong> substance compared to the content of the operational technical<br />

specifications of Kori and Yonggwang NPPs.<br />

Operation modes have been <strong>in</strong>itially classified <strong>in</strong>to 4 modes consider<strong>in</strong>g the<br />

characteristics of the CANDU type nuclear reactors. However, the operation modes have<br />

been classified <strong>in</strong>to five modes as has been shown <strong>in</strong> Table 10.3 <strong>in</strong> order to remove any<br />

ambiguities between operat<strong>in</strong>g conditions and operation modes.<br />

Operation Mode<br />

Table 10.3 Operational Mode of Wolsong NPP<br />

Reactor Output<br />

(% FP)<br />

Reactor Outlet Header<br />

Temp. (℃)<br />

1. Power Operation > 2% > 260<br />

2. Low‐power standby ≤ 2% > 100<br />

3. Hot Shutdown 0 > 100<br />

4. Cold Shutdown 0 ≤ 100<br />

5. Secure shutdown 0 ≤ 60<br />

Reactivity<br />

Conditions

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