3.1 Reactivity Control Systems

Question 1

3.1.1 Shutdown Margin

Answer 1

• SDM shall be withing limits specified in COLR
• Mode 2 with Keff < 1.0,
  Modes 3, 4, and 5

1hr Actions:
A. SDM not within limits
- Initiate boration to restore SDM to within limits
- 15 minutes

Question 2

3.1.2 Core Reactivity

Answer 2

• The measured core reactivity shall be within +/- 1% delta k/k of predicted value
• Modes 1 & 2

Question 3

3.1.3 Moderator Temperature Coefficient

Answer 3

• The MTC shall be maintained within the limits specified in the COLR. The maximum upper limit shall be that specified in Figure 3.1.3-1.
• Mode 1 & 2 with keff >/= 1.0 for upper MTC limit
  Mode 1, 2, and 3 for lower MTC limit

Question 4

3.1.4 Rod Group Alignments

Answer 4

• All shutdown and control rods shall be OPERABLE AND individual indicated rod positions as follows:
  a. With Thermal Power </= 85% RTP, within 18 steps of their group step counter demand position and
  b. with Thermal Power > 85% RTP, within 12 steps of their group step counter demand position or as determined from Figure 3.1.4-1
• Modes 1 & 2

1hr Actions:
A. One or more rods inoperable
A.1.1 Verify SDM within limits - 1HR
OR
A.1.2 Initiate boration to restore SDM to
within limits - 1HR
AND
A.2 Be in Mode 3 - 6Hrs

B. One rod not within alignment Limits
B.1.1 Verify SDM is within limits - 1Hr
OR
B1.2 Initiate boration to restore SDM
within limits - 1 Hr
AND
B.2 Reduce thermal power to </+ 75% RTP
- 2HR

D. More than one rod not within alignment limits:
D.1.1 Verify SDM is within limits - 1Hr
OR
D1.2 Initiate boration to restore SDM
within limits - 1HR
AND
D.2 Be in Mode 3 - 6Hrs

Question 5

3.1.5 Shutdown Bank Insertion Limits

Answer 5

Each Shutdown Bank shall be within insertion limits specified in the COLR
- Modes 1 &2

1 hr Actions:
A. One or more shutdown banks not within limits:
A.1.1 Verify SDM is within limits - 1hr
OR
A.1.2 Initiate boration to restore SDM to
within limits - 1HR
AND
A.2 Restore shutdown banks to within
limits - 2hrs

Question 6

3.1.6 Control Bank Insertion Limits

Answer 6

• Control banks shall be within the insertion, sequence, and overlap limits specified in the COLR.
• Mode 1
  Mode 2 with keff >/= 1.0

1 hr Actions:
A. Control bank insertion limits not met:
A.1.1 Verify SDM is within limits - 1hr
OR
A.1.2 Initiate boration to restore SDM to
within limits - 1HR
AND
A.2 Restore control banks to within
limits - 2hrs

B. Control bank sequence or overlap limits not met:
B.1.1 Verify SDM is within limits - 1hr
OR
B.1.2 Initiate boration to restore SDM to
within limits - 1HR
AND
B.2 Restore control bank sequency and
overlap to within limits - 2hrs

Question 7

3.1.7 Rod Position Indication

Answer 7

• The rod position indication (RPI) system and the demand position indication system shall be Operable
• Modes 1 & 2
  NOTE: Separate entry allowed for each rod position indicator and demand position indicator

1hr Actions:
B. More than one RPI per group inoperable
B.1 Place the rods under manual control -
Immediately
AND
B.2 Monitor and record RCS Tavg - once
per 1 hr

Question 8

3.1.8 Physics Test Exceptions - Mode 2

Answer 8

• During the performance of Physics Test the requirements of:
  3.1.3 - MTC
  3.1.4 - Rod Group Alignment Limits
  3.1.5 - Shutdown Bank Insertion Limits
  3.1.6 - Control Bank Insertion Limits
  3.4.2 - RCS Min Temp for Criticality
  may be suspended.

The number of required channels for 3.3.1, RTS Instrumentation”, Functions 2,3,6, and 18.d may be reduces to 3 provided that:
a. RCS lowest loop avg temp is >/= 531F
b. SDM is with limits of Mode 2 with keff <1.0 specified in 3.1.1 SDM
c. Thermal Power </= 5% RTP

• During Physics Test initiate in Mode 1

1hr Actions:
A. SDM not within limit:
A.1 Initiate boration to restore SDM within
limit - 15 minutes
AND
A.2 Suspend Physics Testing - 1 hr

B. Thermal Power not within limit:
B.1 Open Rx trip bkrs - Immediately