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Regional Basic Professional Training Course in Korea

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❙ 479 ❙<br />

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

In pr<strong>in</strong>ciple, no fuel failure is allowed for AOOs, requir<strong>in</strong>g sufficient marg<strong>in</strong> to the<br />

specified fuel design limit, while DBAs can experience fuel failure but shall ma<strong>in</strong>ta<strong>in</strong><br />

appropriate core cool<strong>in</strong>g without exceed<strong>in</strong>g the applicable radiological limits <strong>in</strong> the<br />

offsite. Also, it is required that the maximum system pressure dur<strong>in</strong>g an AOO must be<br />

kept below 110 % of design pressure. For DBAs, acceptance criteria for the system<br />

pressure and radiological dose are less restrictive than for AOOs, due to the lower<br />

frequency of occurrence. Table 8‐2 presents an example which shows <strong>in</strong>terrelation<br />

between event frequency and acceptance criteria.<br />

Table 8‐2 Interrelation between Event Frequency and Acceptance Criteria<br />

8.3.1. Acceptance Criteria for Anticipated Operational Occurrences<br />

AOOs are generally required to demonstrate that the <strong>in</strong>tr<strong>in</strong>sic features of the design and<br />

the systems automatically actuated by the <strong>in</strong>strumentation, particularly the reactor trip<br />

system, are sufficiently effective to ensure that:<br />

(1) The probability of a boil<strong>in</strong>g crisis anywhere <strong>in</strong> the core is low. This criterion is

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