3.5 Passive Core Cooling System (PXS)

3.5.1 Accumulators

LCO

Applicability

BOTH

Any MODE RCS is >1,000psig

3.5.1 Accumulators

Consequence if INOPERABLE Accumulator coincident with LCO 3.5.2 CMTs-Operating Condition C or E

3.5.2 Cond C: Two CMTs INOPERABLE for temp/boron

3.5.2 Cond E: One CMT INOPERABLE for reason outside of 3.5.2

(3.5.1 Condition B, contingent Completion Time)

Restore 1 hour from coincidence discover

3.5.1 Accumulators

TWO accumulators INOPERABLE?

Enter LCO 3.0.3

Immediately

3.5.1 Accumulators

SR Requirements

Configuration? (Valves)

Volume?

Blanket pressure?

Boron Concentration?

(Official bands in Snip, midpoints listed below)

1700 cu. ft.

703psig

2750ppm

3.5.2 Core Makeup Tanks (CMTs) - Operating

LCO

Applicability

BOTH

Any MODE condition not on RNS

3.5.2 Core Makeup Tanks (CMTs) - Operating

Consequence if Two INOPERABLE CMTs due to Temp or Boron coincident with LCO 3.5.1 Accumulators Condition B

3..5.1 Condition B: One Accumulator INOPERABLE due to other reason than Boron concentration

(3.5.2 Condition C, contingent Completion Time)

Restore 1 hour from coincidence discover

3.5.2 Core Makeup Tanks (CMTs) - Operating

Consequence if One INOPERABLE CMT due to undescribed 3.5.2 condition coincident with LCO 3.5.1 Accumulators Condition B

3..5.1 Condition B: One Accumulator INOPERABLE due to other reason than Boron concentration

(3.5.2 Condition E, contingent Completion Time)

Restore 1 hour from coincidence discover

3.5.2 Core Makeup Tanks (CMTs)

TWO CMTs INOPERABLE?

MODE 3 in 6hrs

(Not LCO 3.0.3)

3.5.2 Core Makeup Tanks (CMTs)

SR Requirements

Temperature?

Configuration? (Valves)

(Official bands in Snip, midpoints listed below)

<120°F

3950ppm

3.5.3 Core Makeup Tanks (CMTs) - Shutdown, Reactor Coolant System (RCS) Intact

LCO

Applicability

ONE

MODE 4 on RNS

MODE 5 NOT vented (intact)

3.5.3 Core Makeup Tanks (CMTs) - Shutdown, Reactor Coolant System (RCS) Intact

SR Requirements

Notice

≥2,450 cu. ft.

There is no 3.5.2 CMTs - Operating volume requirement due to being connected to the RCS at pressure

3.5.4 Passive Residual Heat Removal Heat Exchanger (PRHR HX) - Operating

LCO

Applicability

OPERABLE

Any MODE condition not on RNS

3.5.4 Passive Residual Heat Removal Heat Exchanger (PRHR HX) - Operating

LCO Shutdown Caveats

Simplified:

You have no PRHR, but without a redundant non-safety heatsink in the form of Feedwater to SG(s) don’t move the plant

Basis: “Possible [redundant feedwater] means include two MFWPs(with two CPs), or two SFWPs, or a combination of one MFWP(with one CP) and one SFWP”

3.5.4 Passive Residual Heat Removal Heat Exchanger (PRHR HX) - Operating

SR Requirements

Configuration? (Valves)

Loop RCP relationship?

3.5.5 Passive Residual Heat Removal Heat Exchanger (PRHR HX) - Shutdown, Reactor Coolant System (RCS) Intact

LCO

Applicability

OPERABLE

MODE 4 on RNS

MODE 5 Intact and Pressurizer ≥20%

*Same SR Requirements as 3.5.4

3.5.6 In-containment Refueling Water Storage Tank (IRWST) - Operating

LCO

Applicability

OPERABLE with TWO injection paths and TWO recirc paths

MODES 1, 2, 3, and 4

3.5.6 In-containment Refueling Water Storage Tank (IRWST) - Operating

SR Requirements

Temperature?

Volume?

Boron Concentration?

Configuration? (Valves)

(Official bands in Snip, midpoints listed below)

<120°F (Same as CMTs)

≥73,100 cu. ft.

2750ppm (Same as Accumulators)

3.5.7 In-containment Refueling Water Storage Tank (IRWST) - Shutdown, MODE 5

LCO

Applicability

OPERABLE with ONE injection path and ONE recirc path

MODE 5

*Surveillance Requirements per 3.5.6

3.5.7 In-containment Refueling Water Storage Tank (IRWST) - Shutdown, MODE 5

≤1hr Action(s)

3.5.8 In-containment Refueling Water Storage Tank (IRWST) - Shutdown, MODE 6

LCO

Applicability

OPERABLE with ONE injection path and ONE recirc path

MODE 6

3.5.8 In-containment Refueling Water Storage Tank (IRWST) - Shutdown, MODE 6

≤1hr Action(s)

3.5.8 In-containment Refueling Water Storage Tank (IRWST) - Shutdown, MODE 6

SR Requirements