Effects of a RCIC steamline break on the HPCI room
- Commonwealth Edison Co., Chicago, IL (United States)
A Reactor Core Isolation Cooling (RCIC) steam line break in the RCIC pump room or in the torus will effect the temperature and pressure of the High Pressure Coolant Injection (HPCI) pump room. The extent of the pressurization and heat up of the HPCI room is dependent upon the location of the break as well as the size of the penetrations between the HPCI room and the room where the break occurs. The concern is that a RCIC steam line break could lead to the HPCI room heating up to temperatures above the environmental qualification (EQ) limits of the equipment. The EQ limit is 185 F. If this temperature is reached in the HPCI room, a RCIC steam line break could lead to both the RCIC and HPCI systems being inoperable. This is possible as the torus compartment and Emergency core cooling systems (ECCS) rooms are all located at the same plant elevation level. There are penetrations between these rooms that would act as steam flow paths in the event of a line break or leak. Two different break locations were analyzed using the GOTHIC Containment Analysis Package. The first break was modeled in the RCIC room itself. This should be the limiting break. The volume of the RCIC room is approximately one tenth that of the torus, which is the location of the second break modeled. This difference in volume will result in different heat ups as well as different pressures of the room with the break and connected rooms.
- OSTI ID:
- 376171
- Report Number(s):
- CONF-960426--
- Country of Publication:
- United States
- Language:
- English
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