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Regional Basic Professional Training Course in Korea

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<strong>Regional</strong> <strong>Basic</strong> <strong>Professional</strong> <strong>Tra<strong>in</strong><strong>in</strong>g</strong> <strong>Course</strong> (BPTC) on Nuclear Safety<br />

case where loss of secondary side heat removal is cont<strong>in</strong>ued dur<strong>in</strong>g the long term<br />

period.<br />

(d) Conta<strong>in</strong>ment pressurization due to outflow of the feed water through the break,<br />

and possibly the RCS coolant through the opened pressurizer relief or safety<br />

valves.<br />

(e) Threaten<strong>in</strong>g of the structural <strong>in</strong>tegrity <strong>in</strong> the boundary between the primary and<br />

secondary circuits. Injection of cold water on previously uncovered SG tubes by<br />

recovered feedwater pumps may threaten the SG tube <strong>in</strong>tegrity.<br />

Figure 8‐3 shows one example of predicted RCS pressure and DNBR trends versus time<br />

for a steam l<strong>in</strong>e break.<br />

(a) RCS Pressure (b) DNBR<br />

Fig. 8‐3 Changes <strong>in</strong> RCS Pressure and DNBR for a Feedwater L<strong>in</strong>e Break<br />

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