LOT 201.15 RCS Temperature Monitoring

Question 1

• LOT 201.15 RCS Temperature Monitoring*
• • *

What parameters feed into OT∆T?

Answer 1

T_avg

∆T

Thermal Power

RCS Flow

PZR Pressure

• *∆I**
• Only used when ∆I exceeds +8%*

∆I and PZR Pressure NOT used for OP∆T.

Question 2

• LOT 201.15 RCS Temperature Monitoring*
• • *

What are the RCS NR temperature instruments used for?

Answer 2

• T_avg:*
• *OT∆T**
• *OP∆T**
• *FW Isolation**
• P-4 w/ T_avg - Low (574 ˚F)*
• *P-12**
• < 563 ˚F [2/4] Blocks steam dumps*
• Auctioneered High T_avg:*
• *Rod Control**
• Indication on CP005 is Auctioneered Low T_avg*
• *Steam Dumps**
• *PZR Level Control**
• Auctioneered Low T_avg:*
• *C-17**
• Auctioneered High ∆T:*
• *Rod Insertion Limit**

3 in H_L (120˚ apart for laminar flow concerns) and 1 in C_L per loop.

Also has 3 fast response RTDs in C_L per loop.

• Note:*
• 3 HL RTDs are averaged together to give signal. If 1 fails the system will automatically kick it out.*

Question 3

• LOT 201.15 RCS Temperature Monitoring*
• • *

What are the RCS WR temperature instruments used for?

Answer 3

PAMS

• *COMS**
• Auctioneered Low T_c (PCV-656A) and T_H (PCV-655A)*

H/U and C/D

Aux S/D Panel

1 in H_L and 1 in C_L per loop.

• Note:*
• Located on CP018 and ICS
• ASP for T_C only.