M71 - CTMT/DW Instrumentation

Question 1

How many temperature indicators are there for CTMT, DW, CRD cavity?

Answer 1

CTMT 16

DW 12

CRD cavity 4

Question 2

What division powers signals for inboard/outboard valves

Answer 2

Div 1 outboard

Div 2 inboard

“IN 2”

Question 3

What is the time critical action with this?

Answer 3

1. Ensure that a control room isolation occurs within 20 minutes of any of the following:

(automatic)
-41.6” level, 1.23# DW, 4.5 mr/hr control building air intake

(manual)
MSL rad 3.0 times full power background
MSL Tunnel ambient temp high 185 deg F

Question 4

What are the immediate operator actions?

Answer 4

ISB may be used
If signal is valid, and dampers did not isolate, then attempt to close
Attachment III may be used to identify valves on -41.6” or 1.23#

Question 5

What is the purpose of CTMT and DW pressure instrumentation?

Answer 5

Provide sufficient indication to effectively monitor CTMT and DW conditions

Question 6

How do air operated valves fail?

Answer 6

CLOSED, no signal can interrupt motive power to both closure devices

Question 7

What’s the site radiation boundary limit?

Answer 7

25 REM

Question 8

What’s the purpose of the CTMT isolation system?

Answer 8

1. Prevents release of radioactive materials to the environment by closing CTMT, DW, and Aux bldg isolation valves
2. Provides signal to control room ventilation and suppression pool make-up logic in a LOCA

Question 9

What powers MSIVs?

Answer 9

RPS A and B

Question 10

What’s the purpose of CTMT and Drywell temperature monitoring system?

Answer 10

Assist in determining leakage, ensure atmosphere cooling systems are working properly, and determine CTMT, DW temps, during accident

Question 11

What’s the purpose of suppression pool temp monitoring?

Answer 11

monitors supp pool temps during SRV blowdown and normal plant conditions

Question 12

what powers CTMT, DW, and Aux isolation valves?

Answer 12

Div 1 - 1Y87

Div 2 - 1Y88

Question 13

When does the high CRD cavity temp alarm come in?

Answer 13

145 deg F

Question 14

What is the NSSS logic?

Answer 14

A and D for Div 1

B and C for Div 2

Question 15

What’s the design max pressure for CTMT?

Answer 15

15 psig

Question 16

What’s the design max pressure for Drywell?

Answer 16

30 psig

Question 17

What’s the max design temp for CTMT?

Answer 17

195 deg F

Question 18

What’s the max design temp for Drywell?

Answer 18

330 deg F

Question 19

What’s the purpose of the CTMT monitoring system?

Answer 19

1. Monitor CTMT and DW pressure and temp
2. Suppression pool temp
3. DW airborne radiation level

Question 20

What’s the purpose of Drywell product monitor?

Answer 20

Samples drywell atmosphere for particulate, and noble gas radioactivity

Question 21

What is Group 1 isolations?

Answer 21

MSIV and MSL drains

M NSSSS Manual isolation 
T 185 deg F main steam tunnel temp
V 9" condenser vacuum, in RUN
P <849 psig turbine inlet
L Level 1 -150.3"
F MSL flow high    140% (252.5 psid)

Question 22

What is Group 2 isolations?

Answer 22

RHR to Radwaste

M NSSSS Manual isolation
T RHR equipment rm area high temp (E31/bp) 165 deg
L Level 3, 11.4”
D DW press hi 1.23 psig

Although a group 3 valve, E12-F037 uses group 2 isolation signals

Question 23

What is group 3 isolations?

Answer 23

RHR Shutdown Cooling
M NSSSS Manual Isolation
P Reactor pressure high (NOT F037A/B) > 135 psig
T RHR Eq room area high temp (E31/bp) 165 deg F
L Level 3 11.4”
D DW pressure high (F037 A/B only!) 1.23 psig

Question 24

What are group 4 isolations?

Answer 24

Steam Supply to RHR and RCIC (RCIC STEAM)

M Manual Div 1 initiation
P RCIC steam supply pressure low 60 psig
E RCIC exhaust diaphragm pressure hi 10 psig
T RCIC rm ambient temp high (E31/bp) 185 deg F
RHR rm ambient temp high (E31/bp) 165 deg F
MSL tunnel temp high (E31/bp) 185 deg F (30 min TD!)
S RCIC steam line flow high/low various

Question 25

What are group 5 isolations?

Answer 25

RHR and LPCS Test Line

M Manual initiation
L Level 1 -150.3”
D Drywell pressure high 1.39 psig

Question 26

What are group 6 isolations?

Answer 26

CTMT and Drywell

M NSSSS manual isolation
L Level 2 -41.6”
D Drywell pressure high 1.23 psig

Question 27

What are group 7 isolations?

Answer 27

CTMT Cooling

M NSSSS manual isolation
L Level 2 -41.6”
D Drywell pressure high 1.23 psig
R CTMT and DW Vent Exhaust rad high 3.6 mr/hr

Question 28

What are group 8 isolations?

Answer 28

RWCU

M NSSSS Manual Isolation
S SLC system actuation, Div 1 - F004 / Div 2 -
F001/F251
T High MSL tunnel temp (E31/bp) 185 deg F
High RWCU area temps: (E31/bp) Pump - 170
Valve - 135
Hx - 120
D High RWCU differential flow (E31/bp) 79 gpm for 45 sec
L Level 2 -41.6”
L Loss of Control power to LDS Logic (E31/bp)
N Non regen outlet temp (FD inlet temp) High 140 F

Question 29

What are group 9 isolations?

Answer 29

RCIC Exhaust Vacuum Breakers

PRESS RCIC steam supply press low 60 psig

AND**

DRY Drywell pressure high 1.39 psig

Question 30

What are group 10 isolations?

Answer 30

Reactor Sample Line

L Level 2 -41.6”
R MSL Rad High 3 X FPB (Full Power Background)
I MSL Rad Monitor INOP
M NSSSS Manual isolation

Question 31

What are the Aux Building Isolations?

Answer 31

Aux Building Ventilation

Level 2 -41.6”
DW press high 1.23 psig
FHA Vent Exh Rad high 3.6 mr/hr
Fuel Pool Sweep Exh Rad high 30 mr/hr

Question 32

What groups isolate on Rx water level 11.4” ?

Answer 32

2, 3

Question 33

What groups isolate on Rx water level -41.6” ?

Answer 33

6, 7, 8, 10

Question 34

What groups isolate on Rx water level -150.3” ?

Answer 34

1, 5

Question 35

What groups isolate on 1.39 psig DW pressure?

Answer 35

5 and 9

Question 36

What groups isolate on 1.23 psig DW pressure?

Answer 36

2, 3, 6, 7