Suppression Pool Cleanup & Alternate Decay Heat Removal System Bwr Technology Objectives

Front 1

______ is designed as a non-safety related system to maintain suppression pool water clarity and chemistry, and provide an alternate method of decay heat removal when the reactor is shutdown.

Back 1

SPC/ADHR

Front 2

SPC/ADHR is safety related or not?

Back 2

NOT

Front 3

Provide a method to process Suppression Pool water during plant operation in order to achieve and maintain Suppression Pool water clarity and chemistry.
Design SPC performance requirements to maintain Suppression Pool chemistry is:
0.5 NTU (nephelometric turbidity units) and 1.0 mhos/cm conductivity

Back 3

SPC/ADHR

Front 4

The ADHR function requires the SPC system to be able to:

Back 4

• maintain reactor coolant temperature ≤ 200F in Operating Mode 4 at 20 hours after shutdown;

• reduce reactor coolant temperature to ≤ 140F in Operating Mode 5 at 120 hours after shutdown;
• reduce reactor coolant temperature to ≤ 120F in Operating Mode 5 at 144 hours after shutdown;

• Maintain reactor coolant temperature ≤ 120F thereafter.

Front 5

attached to a 200 horse power motor, to move between 1500 and 2250 gpm through the various flowpaths provided by the system. The pumps can only be operated one at a time. The SPC Filter and Demineralizer must be full to start a pump. The pump will trip on a high system flow of 2500 gpm, or a Low system flow of 600 gpm, or a low suction pressure of 0.3 psig.

Back 5

SPC Pumps

Front 6

provides the heat removal function of the system capable of removing 60 million BTUs/hr which will control decay heat load 20 hours after the reactor is shutdown.

Back 6

SPC Heat Exchanger

Front 7

filters all of the flow, 800 gpm, that is processed through the filter demineralizer skid to cleanup the suppression pool water.

Back 7

SPC Filter

Front 8

treats a portion of the water, 400 gpm, sent to the filter demineralizer skid. Contains mixed bed ion exchange resin to further purify the suppression pool water.

Back 8

SPC Demineralizer

Front 9

Identify how the SPC pumps are protected from ______

Back 9

a low flow condition

Front 10

provides the motive force to manipulate the various Air Operated Valves in the system.

Back 10

Instrument Air

Front 11

Provides the dynamic reverse flow disruption to break away any particles that have collected on the SPC Filter elements, during a backwashing of the filter.

Back 11

Service Air

Front 12

provides isolation of the Containment Isolation Valves RHS-AOV62, 63, and 64 when the RHR system initiates and if a leak is detected in the system.

Back 12

Containment and Reactor Vessel Isolation Control System (CRVICS)

Front 13

cooling medium for the SPC heat exchanger.

Back 13

Normal and Standby Service Water

Front 14

for system filling, backwashing the SPC filter, and rinsing of the backwash tank SPC-TK2.

Back 14

Condensate Makeup, Storage and Transfer System

Front 15

supplies power to the SPC pumps.

Back 15

AC Distribution

Front 16

Level signals to initiate isolation of the system.

Back 16

Nuclear Boiler Instrumentation

Front 17

7. Recognize the parallels between the RBS Mode Change event and the TMI and Chernobyl events.

Back 17

At TMI the operators keyed in on a single indication and did not apply fundamental knowledge to the situation.
At Chernobyl the operators allowed a test to put the plant into an undesirable condition.