SFS(2) - Spent Fuel Pool Cooling

Simplified Diagram

Containment Isolation “T” Response

SFS-V038, V034, V035

IRWST Suctions and Discharge to SFS

V034: B

V035: A

V038: D

CLP Support of RNS

In a response of ADS 1-3 following a LOCA,

RNS may use CLP as a suction source to hold up the CMTs to prevent an ADS 4 Actuation

Pools Map

SFS Pumps

Power Supply?

Standby Diesels?

Trips?

EK-12(22)

Can be MANUALLY loaded to SDG

Nominal 1,200gpm and 150psig

Trips:

Sustained </=700gpm for 10min

</=600gpm for only 10 seconds

SFS

CIV Isolation signals

Manual/Automatic Containment Isolation “T”

Low IRWSTWR 96% (Two LTs, need 1/2) *P-9

Low SFP 23.5’ (Three LTs, need 2/3)

Note Siphon Break is above TS Limit Level of 23’

3.7.5 Spent Fuel Pool Water Level

LCO

<1hr Action(s)

Shall be >/=23’ above TAF

Suspend movement Immediately

Initiate action to restore within 1 hour

T 3.7.7 Spent Fuel Pool Makeup Water Sources

When are the following required as sources to the SFP?

Cask Washdown Pit (CWP)

Cask Loading Pit (CLP)

PCCWST

Fuel Transfer Canal

CWP:

Pool Heat 4.0 - 7.0MWth

CLP:

Pool Heat 5.0 - 7.0MWth
PCCWST:

Pool Heat >7.0MWth *IF the Reactor decay heat is also >7.0MWth; then the PCCWST must be exclusively available for containment per 3.6.6

Canal:

Always

If any source is Inoperable when required, Immediately take action to restore

3.7.11 Spent Fuel Pool Boron Concentration

Required concentration?

>/=2,300ppm

Immediately stop movement and take action to restore