What are the 3 functions of the containment system?
- limit release of radioactive fission products to environment during an accident
- provide biological shielding for personnel during normal and accident conditions
- provide a means of testing the leak-tightness of the containment vessel and penetrations
Function of the containment structure
low leakage divider barrier
refueling canal drains
allows spray water to drain back to the recirc sump if CTS actuted and minimizes the amount of steam bypassing the ice condenser
containment recirculation sump
- provides flow and NPSH for the RHR and CTS pumps to work in recirc mode
- during recirc phase water can also be sent to CCP and SI’s for long term cooling
purpose and operation of the containment airlock door mechanical interlock
how is the weld channel pressurization system placed in to service
- verify control air in service
- verify close CA to weld channel air receivers
- lineup sheet 1
- open CA to weld channel air receivers
- valve in air to electric penetrations
- verify penetrations pressurized locally or by annunciator clearing
Phase A signals
- SI
- Manual
SI Signals
- Containment pressure high 1 psig
- pressurizer pressure low 1775 psig
- steam pressure low 500 psig
- steam line differential pressure 100 psig
- manual
how do you ensure containment operability for a specified penetration
how do you ensure refueling integrity
perform the lineup sheet “refueling integrity”
3 subsystems of containment
how much ice in the condenser
2.5 million pounds
containment penetration and weld channel pressurization purpose
3 tasks for aeos with containment
- stp 10 containment integrity
- stp 41 refueling integrity
- place weld channel pressurization in service
- containment equipment and personell airlock checklist
how are penetrations cooled and why
by ccw to prevent spawling
how do we monitor containment sump pump operation?
run time meters on cas panel
why do we have the canal drains
to get water from upper containment to the recirc sump
how do we cool rcs in recirc mode?
rhr to ccw to esw to lake
what should you consider when opening the airlock
- speed, open slowly
- 2 lights before opening doors
- look in window for other people
- check in and out of work control
- stay out of line of fire
- inspect seals and lube
how are air temps maintained in containment
how many turns on CPN 1
how do you verify valves in the right position?
80 turns
green light lit on fuel transfer panel
