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Regional Basic Professional Training Course in Korea

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❙ 645 ❙<br />

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

Operability requirements for the various systems used for emergency core cool<strong>in</strong>g shall<br />

be stated. These shall <strong>in</strong>clude valve operability, adequacy of coolant <strong>in</strong>jection and<br />

circulation, <strong>in</strong>tegrity of pip<strong>in</strong>g system, and specified limitations on m<strong>in</strong>imum quantities of<br />

fluids for all systems relied upon for emergency core cool<strong>in</strong>g.<br />

10.3.2.3. Coolant and moderator chemistry<br />

Reactor coolant chemical quality<br />

In addition to the pressure and temperature limitations mentioned, limits shall be stated<br />

for coolant chemical quality; for <strong>in</strong>stance, <strong>in</strong> water‐cooled reactors conductivity, pH<br />

value, oxygen content and impurities such as chlor<strong>in</strong>e and fluor<strong>in</strong>e are important.<br />

Moderator and cover gas system<br />

As appropriate, limits regard<strong>in</strong>g moderator temperature, chemical quality and<br />

conta<strong>in</strong>ment levels shall be stated. Limits regard<strong>in</strong>g permissible concentrations of<br />

explosive gas mixtures <strong>in</strong> the cover gas shall also be stated. In this regard, operability<br />

requirements for on‐l<strong>in</strong>e process monitor<strong>in</strong>g equipment shall be specified.<br />

Failed fuel detection<br />

Where on‐l<strong>in</strong>e measurement of coolant activity is used to monitor fuel cladd<strong>in</strong>g <strong>in</strong>tegrity<br />

dur<strong>in</strong>g operation, the m<strong>in</strong>imum provisions for the detection and, where appropriate,<br />

identification of failed or suspect fuel shall be stated.<br />

10.3.2.4. Conta<strong>in</strong>ment systems and accident management systems<br />

Operability requirements for conta<strong>in</strong>ment systems shall be stated and shall <strong>in</strong>clude the<br />

conditions for which conta<strong>in</strong>ment <strong>in</strong>tegrity is not required. Permissible leakage rates shall<br />

be specified, and the operability and condition of the follow<strong>in</strong>g shall be stated: isolation<br />

valves; vacuum breaker valves; actuation devices; filtration, cool<strong>in</strong>g, dous<strong>in</strong>g and spray

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