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Report No.
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Design study on large scale FBR; Plant thermal transient analysis on 600MWe class plant in FY1992

Ohtaki, Akira ; not registered; Tanabe, Hiromi

A plant thermal transient analysis on 600MWe class plant in FY1992 was carried out. A module integrated plant dynamics analysis code Super-COPD was used for the analysis and five analysis cases were chosen to evaluate the plant dynamics characteristics. Four of cases were from Monju operation mode III and one was water/steam re-circulation system failure. A plant system to mitigate thermal transient were examined and evaluated. Followings are summary of each case: (1)[Primary main pump stick] A temperature drop of 145 deg occurred in intermediate heat transfer system (IHTS) cold leg. By decreasing the safety system operation time, secondary pump flow coast down time and secondary loop pony motor flow, the temperature drop was decreased to 60 deg that is smaller than that of Monju. (2)[Secondary main pump stick] There were no significant differences between this plant and Monju. (3)[Main steam and feed water pipe rupture] Twenty minutes after the rupture, a temperature rise to 435 deg in IHTS cold leg. This was caused by large sodium flow rate in steam generator so that hot leg temperature flew down through steam generator to the cold leg without heat exchange. This temperature raise was cleared by decreasing the sodium flow rate in the steam generator. (4)[water/steam re-circulation system failure] The objective of this system is to mitigate the thermal transient and shorten the plant restart. On the contrary, in case of failure, steam generator exit sodium temperature dropped rapidly to feed water temperature and also whole plant temperature decreased rapidly. The new interlock which cuts the feed water with a low signal of steam generator exit sodium temperature, can mitigate this temperature drop.

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