201.02 RCS

Question 1

• 201.02 RCS*
• • *

Functions of RCS

Answer 1

Transport heat from Rx to S/G.

Act as a moderator and a reflector.

Solvent for neutron absorber.

Second boundary of protection against release of fission product to the public.

Question 2

• 201.02 RCS*
• • *

Describe flowpaths through RCS

Answer 2

Through core - out through hot leg to steam generator. Through S/G U-TUBES through the crossover leg to the suction of the RCP. The pump discharges back into the reactor vessel and core.

Question 3

RCS piping sizes

Answer 3

Hot Leg 29” ID

Cold Leg 27.5” ID

Intermediate Leg 31” ID

Question 4

RCS Design Data

Flow Rate -

Total Volume -

Operating Liquid Vol. -

Loop Transit Time -

Rated Thermal Power (RTP) -

Tave -

Design Press -

Life -

Answer 4

Flow Rate - 107,800 gpm per pump

Total Volume - 14,974 ft3

Operating Liquid Vol. - 13,352 ft3

Loop Transit Time - 13.2 sec

Rated Thermal Power (RTP) - 3853 MWt

Tave - 567oF - 593oF

Design Press - 2485 psig

Life - 40 years

Question 5

• 201.02 RCS*
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Function of Interfacing Systems:

Pressurizer

Answer 5

Attainment of operating pressure.

Maintain required pressure.

Limit RCS pressure changes during load changes to allowable limits.

Prevent RCS overpressure.

Question 6

• 201.02 RCS*
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Function of Interfacing Systems:

CVCS

Answer 6

Purify Reactor Coolant

Provide a Means of Chemistry Control

Provide a Means of Varying C_B

Maintain RCS Inventory

Supply RCP Seal Water

Provide a Means for Filling, Draining, and Pressure Testing of the RCS.

Question 7

• 201.02 RCS*
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Function of Interfacing Systems:

RHR System

Answer 7

Decay Heat Removal.

Solid Plant Pressure Control in Conjunction with CVCS.

RHR Heat Exchanger used in ECCS.

Transfer Refueling Water from Refueling Cavity to the RWST.

Question 8

• 201.02 RCS*
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Function of Interfacing Systems:

Safety Injection

Answer 8

Provides Borated Water for Emergency Core Cooling in the Event of a LOCA or Steam Break Accident.

Question 9

• 201.02 RCS*
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Function of Interfacing Systems:

Sampling

Answer 9

Provides access to RCS fluids to obtain chemistry samples.

Question 10

• 201.02 RCS*
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Function of Interfacing Systems:

Drains

Answer 10

Drains to RCDT are located on each loop crossover leg low point

2” lines

Question 11

• 201.02 RCS*
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Instrumentation and Controls to monitor / operate:

Loop Avg Temp Fast Response RTDs

Answer 11

HL

(3) T-hots per loop, located on hot leg before SGs.

CL

(1) T-cold per loop, located downstream RCPs.

Used to generate “Tavg” and Delta T

Question 12

• 201.02 RCS*
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Instrumentation and Controls to monitor / operate:

Pressurizer Safety and Relief Valve Discharge Temperatures

Answer 12

PORVs (TI-676), Safeties (TI-677, 678, 679)

RTDs installed in each tailpipe

Generates high alarm (150°F), indicating valve leakage or valve open

Question 13

• 201.02 RCS*
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Instrumentation and Controls to monitor / operate:

Pressurizer Liquid and Vapor Space Temperature

Answer 13

Liquid (TI-608), Vapor (TI-607)

(2) RTDs one in liquid, one in vapor

Indicates saturation in PRZR