SPDS

Question 1

What is the color scheme for SPDS?

Answer 1

Green - as expected/within limits
Yellow - Pre-alarm
Red - alarm
Cyan - invalid or Indeterminate

Question 2

What bar graphs display in SPDS?

Answer 2

Rx Water Level
Rx Pressure
DW Pressure
DW Temp
Torus Level
Torus Temperature
Rx Power

Question 3

What boxes display at the bottom of SPDS?

Answer 3

Core Spray
SRV
PCIS
Containment Radiation
Rad Release

Question 4

How does the Core Spray SPDS box respond to plant conditions

Answer 4

GREEN if:
No CS demand signal OR CS demand and flow sufficient from one pump
“ON” if flow greater than 750gpm forward

Red if :
If CS demanded but flow insufficient

Question 5

How does the SRV SPDS box respond to plant conditions

Answer 5

Always Green unless Red

Red if :
ADS demand and ADS valve closed
No ADS, pressure less than lowest lift and SRV open
No ADS, pressure above lowest lift and no SRV open

Question 6

What causes the reactor power bar grapgh background to turn red?

Answer 6

Mode switch placed in refuel or shutdown (or scram signal) and after 7 seconds, APRM still on scale;
Scram demand for >240 seconds and any SRM reads higher than 3E5cps

Question 7

What inputs are used for the SPDS Water level module?

Answer 7

NR, MR, FZ, WR

Question 8

What is used for the SPDS RPV Pressure Module, what is preference and why?

Answer 8

NR, MR A & B, WR

MR A is preferred because has its own RPV tap

Question 9

SPDS, what causes SRV Status Box to change?

Answer 9

Open if any relief or safety valve opens (Uses acoustic monitors)
Always green unless REd
Red if - ADS Signal and less than 5 reliefs open
No ADS - Rx press >1112psig and no relieve open
No ADS Rx Press <50psig and any relieve open

Question 10

What is the general limit for SPDS Cont Rad Module?

Answer 10

200R/Hr

Question 11

What causes SPDS Rad Release Module to change?

Answer 11

Always green unless red;

Red if any PRM High (U1 chimney, U2/3 chimney, RB Vent Stack)

Question 12

What is status change for the SPDS Primary Cont. Isolation Module:

Answer 12

Staus box to red if: Isolation demand signal for Grp I or Grp II demanded and isolation unsuccessful
STAYS GREEN if ONE OF 2 VALVES FAILS CLOSED

Question 13

SPDS Alarm Levels for different Parameters:

Answer 13

Param. Lo Lo Pre Al Hi Pre Al Hi Al
Rx Power - - 102% 122%
Rx Level 0in 20in 40in -
Rx Press - 925# 1040# 1060#
DW Press - - 1.5# 2#
DW Temp - - - 200F
Torus Level 11ft 14ft 16ft 27ft
Torus Temp - - 95F 110F