Intro to TSRs

Question 1

What is the purpose of the INL Safety Basis List LST-100?

Answer 1

Contains current revision of the TSR and SAR safety bases and a list of the positive USQs at the time the TSR revision is accepted by DOE.

Question 2

What is the purpose of the ATR Criticality Control List?

Answer 2

Identifies the controls for fissile material storage and handling within ATR.

Question 3

What is the Purpose of section 1 of the TSR (Use and Applications)?

Answer 3

How to use the TSRs.

Question 4

What is the purpose of section 2 of the TSR (safety limits)?

Answer 4

The safety envelope that the ATR must be operated within. Violations of limits require the plant to be placed in a safe condition and require analysis to resume operation.

Question 5

What is the purpose of section 3/4 of the TSR (Operating Limits and SRs)?

Answer 5

Bands within the Safety Limit that the ATR must be operated (more limiting than Safety Limits)

Question 6

What is the purpose of section 5 of the TSR (Administrative Controls)?

Answer 6

Controls of the ATR that are purely administrative in nature.

Question 7

What is the purpose of the TSR bases?

Answer 7

More information on each limit or control.

Question 8

What are the modes of operation?

Answer 8

Seven Modes:
1. Power Ops
2. Low Power Ops
3. Pressurized Standby
4. Pressurized Shutdown
5. Depressurized Standby
6. Depressurized Shutdown
7. Reactor Defueled

Question 9

What three factors define the mode of operation?

Answer 9

1. Safety rod status
2. PCS boundary
3. EFIS in AUTO or MANUAL

Question 10

What are the two categories in the TSR for which safety limits are provided?

Answer 10

Core thermal performance
Primary coolant system

Question 11

What are the four core thermal performance parameters for safety limits?

Answer 11

1. Steady-state power
2. RV DP (low)
3. Reactor inlet pressure
4. Reactor coolant flow

Question 12

What are the three PCS parameters for safety limits?

Answer 12

1. PCS pressure
2. PCS temperature
3. RV DP (high)

Question 13

What is the difference between section 3 and 4 of the TSR?

Answer 13

Section 3 contains LCOs
Section 4 contains SRs

Question 14

When do administrative controls apply to ATR?

Answer 14

During all reactor operating conditions unless otherwise stated within the particular AC.

Question 15

What is the purpose of AC 5.3.2?

Answer 15

Minimum allowable ATR staff for various plant conditions.

Question 16

What is the purpose of AC 5.4.3/4?

Answer 16

Violation of TSR and response to TSR violations.

Question 17

What is the purpose of AC 5.7.11?

Answer 17

Requires an ESAP for each experiment.

Question 18

Lessons learned ATR EFIS Valve failure?

Answer 18

EFIS time response testing being performed.
Portion of testing included valve actuation with n2 bottle backup system.
EFIS valves were actuated for RCR, one valve shut and other remained open with hissing sound.
I&C tech and operator returned to area found LCV-1-7A/B in OPEN position. No pressure in n2 bottle.
Operations went outside of procedure, reset the solenoids and the valve fractured.

Question 19

Lessons learned from PT-10-6 calibration?

Answer 19

PT-10-6 indicated pressure dropped below min level during maintenance activities. Calibration was performed, and alarm received. Returned to normal after vent was shut. Wrong alternate isolated PT to meet LCO.