C.4 Essay Test Item Examples cont'd

DOE-HDBK-1204-97

APPENDIX C

TEST ITEM EXAMPLES

(d)

No adjustments required, the inherent power coefficients will maintain the

reactor at constant power.

Answer: (b).

C.4 Essay Test Item Examples

Satisfactory:

Test item:

Assume the reactor is at 100% power. For each of the following reactor protective

system trips, state (a) the sensed parameter, (b) the limiting safety system setting

(LSSS), and (c) the protection provided.

(1)

High power level trip (3 points)

(2)

Low reactor coolant flow trip (3 points)

(3)

Steam generator differential pressure trip (3 points)

Answer:

(1)

(a)

Neutron flux (thermal backup) is sensed.

(b)

LSSS @ 100% is 107% of rated power.

(c)

Prevents clad damage due to reactivity excursions too rapid to be

detected by pressure/temperature trips.

C-12