Section 3.3 INSTRUMENTATION

Question 1

What is T.S. 3.3.1 Reactor Protective System (RPS) Instrumentation and its applicability?

Answer 1

3.3.1 Reactor Protective System (RPS) Instrumentation

Four RPS trip units, associated instrument channels, and associated Zero
Power Mode (ZPM) Bypass removal channels for each of the following.

1) VHPT
* Modes 1, 2, 3, 4 & 5
2) High Startup Rate

• Modes 1 & 2
• Active: 1E-4% RTP < THERMAL POWER < 13% RTP

3) Low Primary Coolant System Flow Trip

• Modes 1 & 2 and 3, 4, 5 with more than one full-length control rod capable of being withdrawn and PCS boron concentration less than REFUELING BORON CONCENTRATION
• ZPM Bypass available at < 1E-4% RTP. Bypass shall be automatically removed
  when Wide Range Power is ≥ 1E-4% RTP.

4/5) Low SG Level Trip (A & B)

• Modes 1 & 2 and 3, 4, 5 with more than one full-length control rod capable of being withdrawn and PCS boron concentration less than REFUELING BORON CONCENTRATION

6/7) Low SG Pressure Trip (A &B)

• Modes 1 & 2 and 3, 4, 5 with more than one full-length control rod capable of being withdrawn and PCS boron concentration less than REFUELING BORON CONCENTRATION
• ZPM Bypass available at < 1E-4% RTP. Bypass shall be automatically removed
  when Wide Range Power is ≥ 1E-4% RTP.

8) High Pressurizer Pressure Trip
* Modes 1 & 2 and 3, 4, 5 with more than one full-length control rod capable of being withdrawn and PCS boron concentration less than REFUELING BORON CONCENTRATION
9) Thermal Margin/Low Pressure Trip

• Modes 1 & 2 and 3, 4, 5 with more than one full-length control rod capable of being withdrawn and PCS boron concentration less than REFUELING BORON CONCENTRATION
• ZPM Bypass available at < 1E-4% RTP. Bypass shall be automatically removed
  when Wide Range Power is ≥ 1E-4% RTP.

10) Loss of Load Trip

• Mode 1
• When THERMAL POWER is ≥ 17% RTP

11) Containment High Pressure Trip
* Modes 1 & 2 and 3, 4, 5 with more than one full-length control rod capable of being withdrawn and PCS boron concentration less than REFUELING BORON CONCENTRATION
12) Zero Power Mode Bypass
* Modes 1 & 2 and 3, 4, 5 with more than one full-length control rod capable of being withdrawn and PCS boron concentration less than REFUELING BORON CONCENTRATION

Question 2

Per T.S. 3.3.1 Reactor Protection System, what must be done if a Zero Power Mode Bypass function is inoperable?

Answer 2

T.S. 3.3.1 ZPM Bypass Inoperable

Immediately either remove the affected ZPM Bypasses. or declare affected trip
units inoperable.

Question 3

According to T.S. 3.3.1 Reactor Protection System, what must be done if one or more Functions with two RPS trip units or associated instrument channels inoperable?

Answer 3

One or more Functions with two RPS trip units or associated instrument channels inoperable.

Within 1 hour, place one trip unit in trip.

Question 4

At what Control Room air temperature does T.S. 3.3.1 Reactor Protection System require a shutdown?

Answer 4

Control room ambient air temperature > 90F.

Be in Mode 3 in 6 Hours

And verify no more than one full-length control rod is capable of being withdrawn or PCS boron concentration is at REFUELING BORON CONCENTRATION.

Question 5

What is T.S. 3.3.2 Reactor Protective System (RPS) Logic and Trip Initiation and its applicability?

Answer 5

3.3.2 Reactor Protective System (RPS) Logic and Trip Initiation

Six channels of RPS Matrix Logic, four channels of RPS Trip Initiation Logic, and two channels of RPS Manual Trip shall be OPERABLE.

MODES 1 and 2,
MODES 3, 4, and 5, with more than one full-length control rod capable of
being withdrawn and Primary Coolant System (PCS) boron concentration less than REFUELING BORON CONCENTRATION.

Question 6

What do you do if one channel of Trip Initiation Logic is inoperable for T.S. 3.3.2 Reactor Protective System (RPS) Logic and Trip Initiation?

Answer 6

3.3.2 Reactor Protective System (RPS) Logic and Trip Initiation

If one channel of Trip Initiation Logic inoperable, then within 1 hour de-energize the affected clutch power supplies.

Question 7

What do you do if two channels of Trip Initiation Logic is inoperable for T.S. 3.3.2 Reactor Protective System (RPS) Logic and Trip Initiation?

Answer 7

3.3.2 Reactor Protective System (RPS) Logic and Trip Initiation

If two channels of Trip Initiation Logic affecting the same trip leg inoperable, then IMMEDIATELY de-energize the affected clutch power supplies.

Question 8

What is T.S. 3.3.3 Engineered Safety Features (ESF) Instrumentation and its applicability?

Answer 8

3.3.3 Engineered Safety Features (ESF) Instrumentation

Four ESF bistables and associated instrument channels for each Function as follows shall be OPERABLE.

1) Safety Injection Signal (SIS)

• Pressurizer Low Pressure in Modes 1, 2 and 3
• CHP Left and Right in Modes 1, 2 and 3

2) Steam Generator Low Pressure Signal (SGLP)
* SG A & B Low Pressure in Mode 1 and Modes 2 and 3 if MSIV not closed and deactivated and MFRV and MFRV Bypass Valves are not closed and deactivated or isolated via manual valves.
3) Recirculation Actuation Signal (RAS)
* SIRWT Low Level in Modes 1, 2 and 3
4) Auxiliary Feedwater Actuation Signal (AFAS)
* SG A & B Low Level in Modes 1, 2 and 3
5) Containment High Pressure (CHP)
* CHP Left and Right in Modes 1, 2 and 3
6) Containment High Radiation Signal (CHR)
* CHR in Modes 1, 2, 3 and 4
7) Automatic Bypass Removals

• Pressurizer Low Pressure Bypass in Modes 1, 2 and 3
• SG A & B Low Pressure Bypass in Mode 1 and Modes 2 and 3 if MSIV not closed and deactivated and MFRV and MFRV Bypass Valves are not closed and deactivated or isolated via manual valves.

Question 9

What is an Engineered Safety Feature? What are the signals that actuate an ESF?

Answer 9

Engineered Safety Features are systems desinged to mitigate accidents.

1) Safety Injection Signal
2) Steam Generator Low Pressure Signal
3) Recirculation Actuation Signal
4) Auxiliary Feedwater Actuation Signal
5) Containment High Pressure Signal
6) Containment High Radiation Signal
7) Pressurizer and SG LP Signal Block Removal

Question 10

How does SIAS/Low Pressurizer Pressure Block and Removal work?

Answer 10

SIAS Block and Removal

• On 2 out of 4 Pressurizer Pressure Switches at 1605 lbs SIAS in initiated.
• On downpowers, SIAS can be blocked when Pressurizer Pressure reaches 1687 on 3 out of 4 pressurizer pressure switches.
• SIAS Block is automatically removed when 2 out of four pressure switches rise above 1690.
• CHP and Manual initiation will still give SIAS

Question 11

How does the SG LP Block and Removal function?

Answer 11

SG LP Block and Removal

3 out of 4 SG Pressure Switches indicate less than 550 psig, then that generator’s low pressure signal may be blocked.

2 out of 4 SG Pressure Switches indicate greater than 550 psig, that the low pressure signal block is removed for that generator.

Question 12

What is T.S. 3.3.4 Engineered Safety Features (ESF) Logic and Manual Initiation?

Any 1 hour or less actions?

Answer 12

T.S. 3.3.4 Engineered Safety Features (ESF) Logic and Manual Initiation

Applicable

• SIS/RAS/AFAS are all applicable in Modes 1, 2 & 3
• SGLP is applicable in Mode 1, for Modes 2&3 it is Not required to be OPERABLE when all Main Steam Isolation Valves (MSIVs) are closed and deactivated, and all Main Feedwater Regulating Valves (MFRVs) and MFRV bypass valves are either closed and deactivated, or isolated by closed manual valves.
• CHP/CHR are applicable in Modes 1-4.

No 1-hour or less actions.

Question 13

What is T.S. 3.3.5 Diesel Generator (DG) - Undervoltage Start (UV Start)?

Any 1-hour or less actions?

Answer 13

T.S. 3.3.5 Diesel Generator (DG) - Undervoltage Start (UV Start)

Applicable When associated DG is required to be OPERABLE.

Three channels of Loss of Voltage Function and three channels of Degraded Voltage Function auto-initiation instrumentation and associated logic channels for each DG shall be OPERABLE.

1-hour or less actions

Immediately declare affected DG inorperable when one or more Functions with one channel per DG inoperable.

Question 14

What is T.S. 3.3.6 Refueling Containment High Radiation (CHR) Instrumentation?

Any 1-hour or less actions?

Answer 14

T.S. 3.3.6 Refueling Containment High Radiation (CHR) Instrumentation

Applicable During CORE ALTERATIONS, During movement of irradiated fuel assemblies within containment.

Two Refueling CHR Automatic Actuation Function channels and two CHR Manual Actuation Function channels shall be OPERABLE.

1-hour or less

One or more Functions with two channels inoperable, IMMEDIATELY suspend core alterations and movement of irradiated fuel assemblies in containment.

Question 15

What is T.S. 3.3.7 Post Accident Monitoring (PAM) Instrumentation?

Any 1-hour or less actions?

Answer 15

T.S. 3.3.7 Post Accident Monitoring (PAM) Instrumentation

Applicable MODES 1, 2, and 3.