Plant is at 100% power. An inadvertent CIA signal occurs during Rx protection system maintenance.
How, if all, is the neutron shield tank system affected?
cooling shifts from CDS to CCP
Which of the following is not a function of the neutron shield tank?
maintain Rx vessel wall temperature
The purpose of the NSS is to________.
cool the water circulated by natural circulation through the neutron shield tank
Corrosion inhibiting chemicals is added to the neutron shield tank cooling system (NSS) via a normally closed, manual valve located on the _______.
neutron shield tank surge tank
The _____ is filled with primary grade water to provide shielding and reduce radiation levels inside containment.
neutron shield tank
The neutron shield tank (NST) fill valve operates to provide makeup water to the neutron shield tank cooling system by ______.
remote-manual operation from the control room
Why is the neutron shield tank surge tank level allowed to go off scale low during a plant cooldown?
prevents excessive inventory adjustments due to the contraction of the NST volume
How does the actuation of CIA affect the operation of the neutron shield tank cooling system?
reactor plant chilled water is automatically isolated, and CCP is automatically aligned to supply the NST coolers
When RCS temp is 550F, why is the neutron shield tank surge tank level maintained between 60% and 65%?
provides the required volume to support a plant cooldown
What action(s) are necessary if during a normal plant cooldown NST temperature lowers to 70F?
isolate one NST cooler by closing the cooler outlet valve
Which of the following conditions would require additional makeup to the neutron shield tank surge tank from the primary grade water system?
following a plant heat up to an RCS temperature of >550F the NST surge tank level is <60%
The neutron shield tank provides ______ as well as mechanical support for the reactor vessel.
radiation shielding
Why is potassium dichromate added to the neutron shield tank water?
corrosion protection
Waste liquid that has been drained from the neutron shield tank must be disposed of as:
mixed waste
