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Regional Basic Professional Training Course in Korea

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❙ 531 ❙<br />

8-B. Determ<strong>in</strong>istic Accident Analysis (LOCA)<br />

8.8 OVERVIEW OF SBLOCA ANALYSIS<br />

In this chapter, Small Break LOCA and the related safety regulation is described. First, the<br />

general behavior of small break LOCA is addressed and then the technical standard of the<br />

regulation and the analysis method for <strong>Korea</strong>n Standard Nuclear Power Plants is discussed.<br />

8.8.1. General Behavior<br />

The outstand<strong>in</strong>g difference between LBLOCA and SBLOCA is the changes of coolant<br />

velocity discharged out of break po<strong>in</strong>t and the resultant change of pressure of reactor<br />

coolant system (RCS). In case of SBLOCA, a response of RCS follow<strong>in</strong>g SBLOCA is<br />

slower than one of LBLOCA. In other words, it is highly possible for operator to<br />

<strong>in</strong>tervene the system response and potential to result <strong>in</strong> unexpected phenomena. And<br />

<strong>in</strong>ertia of the fluid has a dom<strong>in</strong>ant effect <strong>in</strong> LBLOCA while gravity of the coolant has a<br />

important role follow<strong>in</strong>g SBLOCA. The SBLOCA thermal‐hydraulic behavior <strong>in</strong> two‐<br />

loop PWR is as follows [1]:<br />

Figure 8.8‐1 Initial state follow<strong>in</strong>g<br />

SBLOCA of 2‐loop plant

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