RCS Heatup and Cooldown

Question 1

What is the most limiting component?

Answer 1

Outer reactor vessel wall

Question 2

Per TS LCO 3.4.3, RCS Pressure and Temperature HU and CD rates shall be maintained within the limits of what? And what times?

Answer 2

The PTLR. At all times except when head is fully de-tensioned (can’t pressurize the RCS)

Question 3

The PZR is limited to what MAX HU and CD rates?

Answer 3

200F/Hour HU and CD rates

Question 4

What are the PTLR limitations?

Answer 4

80-92F = 75F HU / 30F CD
92-100F = 75F HU / 50F CD
100-221F = 75F HU / 100F CD
>221F = 75F HU / 100F CD

NOTE: Acceptable operating space is to the RIGHT of the limit lines (PTLR TA2-1 or 2-2)

Question 5

Why do we monitor PZR Spray Temp Differential during HU and CD per RC01?

Answer 5

To determine the cyclic limit of PZR Spray Nozzles

Question 6

What temps are used for differential temps during RCP operation? SDC operation?

Answer 6

Lowest reading TCOLD on loop with operating RCP

On SDC, use SDCHX outlet on operating SDC train

Question 7

What pressure instruments are used for RC01?

Answer 7

> 750# - Wide Range
<750# - Narrow Range

NOTE: Use steam tables if PZR temp instruments are not available (PZR T-sat)

Question 8

When do we count valve cycles on main spray? Aux spray?

Answer 8

Main - <4 RCP’s

Aux - Anytime used

Question 9

LCO Limitations on HU and CD rates apply to?

Answer 9

A “Rolling” Hourly average

Question 10

When would the limits direct stabilization and hold at current temperatures?

Answer 10

If rate >50% of hourly rate in a 15 minute period (hold for remaining 15 minute periods in that rolling hour)