Primary Containment Isolation - 1.0

Question 1

What systems does PCIS initiate isolations?

Answer 1

a. Torus Water Cleanup supply and return (Tech Spec Group 8).
b. Drywell Equipment Drain Sump and Floor Drain Sump discharge to radwaste (Tech Spec Group 9).
c. Drywell Coolers chilled water supply and return (Tech Spec Group 10).
d. CRD to Recirculation Pump seals (Tech Spec Group 11).
e. Containment Atmosphere Control Drywell and Suppression Chamber purge supply and exhaust and nitrogen purge (Tech Spec Group 12).
f. Hydrogen/Oxygen Analyzer sampling and return (Tech Spec Group 13).
g. Containment Hydrogen Recombiner supply and return (Tech Spec Group 14).
h. Primary Containment Instrument Gas supply and return (Tech Spec Group 15).
i. RACS cooling water supply and return (Tech Spec Group 16).
j. PCIG Tip Purge isolation (Tech Spec Group 17).
k. Reactor Coolant Pressure Boundary Leak Detection System sampling and return (Tech Spec Group 18).

Question 2

Describe the Logic for PCIS.

Answer 2

There are 4 “two-out-of-two” logic channels. Each one of two valves in each penetration is closed by one channel initation. Any 3 logic initiations close all valves.

Question 3

What differentiates PCIS from NSSS?

Answer 3

Closes valves that connect to primary containment in systems NOT connected to the RPV

Question 4

What are the LOCA Level 1 isolation signals?

Answer 4

• -129” RPV (From Core Spray)
• 1.68 psig Drywell (From Core Spray)
• Core Spray Manual P.B.

Question 5

What are the LOCA Level 1 isolation signals?

Answer 5

• -129” RPV (From Core Spray)
• 1.68 psig Drywell (From Core Spray)
• Core Spray Manual P.B.

Question 6

What are the actuations for PCIG major?

Answer 6

-129” RWL
1.68 # D/W press
1 x 10-3 uCi/cc Rx Bldg Hi-Hi rad

Question 7

What are the actuations for PCIG minor?

Answer 7

-38” RWL
1.68 # D/W press
1 x 10-3 uCi/cc Rx Bldg Hi-Hi rad

Question 8

What are the actuations for XCONNECTS?

Answer 8

-129” RWL
1.68 # D/W press

Question 9

What are the actuations for RHR A?

Answer 9

-129” RWL
1.68 # D/W press

Question 10

What are the actuations for RHR RW & SAMPLE?

Answer 10

+12.5” RWL
1.68 # D/W press

Question 11

What are the actuations for RHR B?

Answer 11

-129” RWL
1.68 # D/W press

Question 12

What are the actuations for RHR SHUTDOWN CLG?

Answer 12

+12.5” RWL

Question 13

What are the actuations for RCIC VAC BKR(64.5#)?

Answer 13

1.68 # D/W press

Question 14

What are the actuations for HPCI VAC BKR(100#)?

Answer 14

1.68 # D/W press

Question 15

What are the actuations for CS TEST RETURN?

Answer 15

-129” RWL
1.68 # D/W press

Question 16

What are the actuations for FPCC HX XCONNECT?

Answer 16

-129” RWL
1.68 # D/W press

Question 17

What are the actuations for TIPS?

Answer 17

-38” RWL
1.68 # D/W press
1 x 10-3 uCi/cc Rx Bldg Hi-Hi rad

Question 18

What are the actuations for TWCU?

Answer 18

-38” RWL
1.68 # D/W press
1 x 10-3 uCi/cc Rx Bldg Hi-Hi rad

Question 19

What are the actuations for DW SUMPS?

Answer 19

-38” RWL
1.68 # D/W press
1 x 10-3 uCi/cc Rx Bldg Hi-Hi rad

Question 20

What are the actuations for PRIMARY CONTAINMENT MIMC?

Answer 20

-38” RWL
1.68 # D/W press
1 x 10-3 uCi/cc Rx Bldg Hi-Hi rad

Question 21

What happens to the PCIS signals upon a loss of 125 VDC?

Answer 21

Loss of the 125 VDC buses will prevent the CS logic from initiating and sending the applicable signals to the PCIS system for Isolations/Initiations.

Question 22

What does failure of a 481 inverter cause with respect to CS and PCIS logic?

Answer 22

Failure of the UPS power to a specififed CS logic cabinet trip relays will prevent that particular division of CS trip relays from initiating isolation functions from CS to the PCIS system

Question 23

What does failure of a 482 inverter cause with respect to CS and PCIS logic?

Answer 23

Failure of the UPS power to a specific logic cabinet will prevent that particular division of the PCIS from initiating isolation functions

Question 24

What are the logic coincidence for initiation?

Answer 24

• Level 1 2/2
• Level 2 2/2
• Hi Rad 2/3

If 3 logics trip, then one valve per each penetration shuts.

Question 25

How can you reset PCIS?

Answer 25

• If only a PCIS needs to be reset, only PCIS needs to get reset.
• If a system that share PCIS and NS4 needs resetting, reset both.
• A level 2 would require a NS4 and PCIS reset. Level 1 only needs Core spray.

Question 26

What are power supplies associated with PCIS?

Answer 26

• A-DD481 inverters power instrumentation.
• A-DD482 inverters powers bailey logic.
• Failure of inverter will inhibit the associated channel.
• A-DD417 feed CS cabinets.

Question 27

Which SACS pumps starts during LOCA?

Answer 27

• A/B on Level 2
• All pumps on Level 1

Question 28

What happens to SSW during LOCA?

Answer 28

• All pumps start on LOCA 2/1.
• SSW to RACS is isolated.

Question 29

When does FRVS start?

Answer 29

On LOCA level 2.

Question 30

How many channels does PCIS have?

Answer 30

A-D channels.
Energized to operate
1. Arm & depress of a channel will close the valves for PCIS systems.

Question 31

What are the systems does PCIS isolate?

Answer 31

E. Isolates the following systems:
Torus Water Cleanup
Containment Atm.
Control PCIG
CRD to Recirc Seals
Drywell Equipment Drains
Drywell Chill Water
Drywell Purge
H2/02 Analyzer
H2 Recombiner
PCIG Tip Purge
RACS
Rx Coolant Leak Detection

Question 32

What is the AC power supply to the CS logic?

Answer 32

The Class 1E instrumentation AC power supply inverters provide single phase, 120VAC to the CS logic cabinets as shown.

Inverter | Logic Cabinet
1AD481 | 10C617
1BD481 | 10C618
1CD481 | 10C641
1DD481 | 10C640

Question 33

What are the inverter power supplies to the trip relays?

Answer 33

1(A-D)D482 inverters power (A-D)C652 trip relays.

Question 34

What happens when inverter is placed in Bypass to Alternate?

Answer 34

Places it on the 40X bus directly.

Question 35

What happens to a Loss of 482 inverter?

Answer 35

Failure of the UPS power to a specific logic cabinet will prevent that particular division of the PCIS from initiating isolation functions – PCIS is a bailey function

Question 36

What happens on a loss of 481 inverter?

Answer 36

Failure of the UPS power to a specified CS logic cabinet trip relays will prevent that particular division of CS trip relays from initiating isolation functions from CS to the PCIS system.