Mitigation of PTS Transients by System Design in KWU PWR Plants
Pressurized thermal shock transients in PWR’s can be caused by loss of coolant accidents on the primary side or induced by transients and accidents on the secondary side. In the present paper the design of KWU’s ECCS will be presented and the advantage discussed of hot side injection by the HP safety injection pumps compared with cold side injection in the event of small primary side leaks. The most important transients encountered on the secondary side are caused for example by steam line or feedwater line leaks or inadvertent opening of valves in the steam lines. These will be discussed and it will be shown, that overcooling of the RPV wall is limited by automatic countermeasures in most of these cases.
KeywordsSteam Generator Reactor Pressure Vessel Steam Line Primary Side Secondary Side
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