S/D AP's (SD-0,1,2,3,4,5)

Question 1

S/D AP’s

No power, RCS not intact, drained to mid loop, what method of heat removal used?

what if you have power?

what if RCS intact?

Answer 1

fill and spill

feed and bleed

natural cir or reflux boiling

Question 2

S/D AP’s

in refference to Appx D, why is the RCS pressurized to 150 psig when using SG to cool core?

Why do we raise L _s/g WR to 95%?

what do we do if we cant get to 95%?

Answer 2

aid in thermal driving head (higher T_rcs)

best chance to establish Natural circulation

raise level to 75% (feed ring at 80%)

Question 3

S/D AP’s

What implications in these proceedures does having

L _rwst < 25%?

When are SD AP’s applicable?

Answer 3

the RCS is allowed to H/U to T_sat

(it requires 8X less inventory to keep core cooled at saturation conditions than subcooled)

Modes 5 & 6