E22-2 - ADS/SRV

Question 1

When will drywell pressure be bypassed on ADS logic?

Answer 1

If Rx level is < -150.3” for more than 9.2 minutes

Question 2

What is the LO-LO set logic?

Answer 2

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Initial Lo-Lo set Reset

• 51D 1103 1033 926
• 51B 1113 1073 936
• 47D 1113 1113 946
• 47G 1113 1113 946
• 51A 1113 1113 946
• 51F 1113 1113 946

Question 3

How is LO-LO set reset?

Answer 3

manually

Question 4

What valves are ADS valves?

Answer 4

B21:

• F041D
• F041F
• F041K
• F047A
• F047L
• F051A
• F051B
• F051C

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Question 5

What valves can be operated from Remote Shutdown Panel?

Answer 5

Lo Lo set valves

Question 6

When do SRV valves open for relief operation?

Answer 6

1 valve - 1103 psig open, 1003 close

10 valves - 1113 psig open, 1013 close

9 valves - 1123 psig open, 1023 close

Question 7

How many SRV’s per steam line?

Answer 7

A and D have 4 each

B and C have 6 each

20 total

Question 8

Purpose of the vacuum breakers?

Answer 8

Prevent vacuum from condensing steam in discharge piping, causing suppression pool to enter piping and eventually water hammer

Question 9

When do valves open in safety mode?

Answer 9

8 valves @ 1165 psig

6 valves @ 1180 psig

6 valves @ 1190 psig

Question 10

How many ADS valves can be operated from Remote Shutdown panel?

what valves are they?

Answer 10

2

(4 switches…. 2 switches on each panel)

51 A/B

Question 11

How much air pressure is supplied to ADS valves and SRVs?

Answer 11

ADS supplies 165 psig to ADS and F051D.

All other SRVs have Instrument air @ 120 psig

Question 12

How many accumulators does each SRV have?

Answer 12

Non ADS except 51D have 1.

ADS and 51D have 2

Question 13

How does light indication show a SRV open/close?

Answer 13

>= 30psig shows valve open (red) tailpipe pressure

< 30 psig shows valve green (closed) tailpipe pressure

valve can be opened, yet showing closed if tailpipe pressure is < 30 psig

Question 14

what powers logic to tailpipe pressure?

Answer 14

Div 1

Question 15

What is the purpose of ADS?

Answer 15

Serves as a backup to HPCS to depressurize the reactor so that Low Pressure ECCS can inject

Question 16

Purpose of SRV?

Answer 16

SRVs help to control Rx pressure < 1325 psig

Question 17

How many SRVs?

Answer 17

20

Question 18

How many SRVs are ADS valves?

Answer 18

8

Question 19

Where are the SRVs located?

Answer 19

main steam line, upstream of MSIV

Question 20

What two modes can SRVs operate in?

How does each mode work?

Answer 20

Safety mode - mechanical (Rx pressure vs Spring)

Relief mode - pneumatic

Question 21

Power supplies for the SRVs?

Answer 21

Div 1, 11DA

Div 2, 11DB

Question 22

what valves does ADS Air supply?

Answer 22

ADS valves AND F051D

Question 23

How many pilot soleniods must be energized to open SRV?

Answer 23

Normally de-energized, energizing ONE will allow SRV to open.

energize one to open

de-energize two to close

Question 24

When does the high temp alarm come in for the tailpipe temp?

Answer 24

155ºF

Question 25

What happens to ADS logic if an ECCS pump trips?

Answer 25

Logic resets

Question 26

When does the ADS low air receiver annunciator come in?

Answer 26

< 152 psig

Question 27

What sensors must energize to set off ADS?

Answer 27

Div 1 - A&E or Div 2 - B&F

Question 28

What is the logic after ADS receives a signal?

Answer 28

11.4” AND -150.3” AND 1.39# DW (DW can be bypassed if <150.3” for 9.2 minutes)

THEN, 105 second time delay

THEN ECCS discharge pressure (145# LPCS, 125# RHR A/B/C

Question 29

If AC power is lost, is the logic lost to ADS?

Answer 29

NO