C.4 Essay Test Item Examples cont'd

DOE-HDBK-1204-97

APPENDIX C

TEST ITEM EXAMPLES

Answer:

(a)

Neutron flux (thermal backup) is sensed (0.3)

LSSS @ 100% is 107% of rated power (0.2)

Prevents clad damage due to reactivity excursions too rapid to be detected by

pressure/temperature trips (0.5)

(b)

RCS differential pressure across each SG is sensed (0.3)

LSSS @ 100% is 95% of max flow (0.2)

Protects against DNB (0.5)

(c)

Secondary differential pressure across each SG is sensed (0.3)

LSSS @ 100% 135 psid (0.2)

Protects the core against DNB (0.5)

(d)

LSSS @ 100% is 5 psig (0.1)

Assures reactor is tripped whenever SG is sensed (0.4)

Reference: FCS TS 1.3, p. 1-7 to 1-10.

Comment:

The developer has assigned different values to responses (i.e., state the

sensed parameter, limiting safety system setting, and what each trip protects

against).

Abbreviations are used instead of complete wording.

C-14