Q56 — Rod Position Indication / Group Demand Step Counter
T2G2 014A2.11 (3.0)
Given:
- Salem Unit 2 is at 100% power
- Control Bank D rods are at 200 steps
Then:
- The Group Demand Step Counter on 2CC2 console for Control Bank D Group 1 rods fails (blank screen)
In accordance with S2.OP-DL.ZZ-0003, Control Room Logs, which of the following completes both statements?
1. The Plant Computer displays the rod demand step position for Group(s) (1).
2. Based on the above condition, the Plant Computer (2) be used to satisfy the Tech Spec requirements for the failed console group demand step counter.
- Salem Unit 2 is at 100% power
- Control Bank D rods are at 200 steps
Then:
- The Group Demand Step Counter on 2CC2 console for Control Bank D Group 1 rods fails (blank screen)
In accordance with S2.OP-DL.ZZ-0003, Control Room Logs, which of the following completes both statements?
1. The Plant Computer displays the rod demand step position for Group(s) (1).
2. Based on the above condition, the Plant Computer (2) be used to satisfy the Tech Spec requirements for the failed console group demand step counter.
A. (1) 1 Only (2) can
B. (1) 1 and 2 (2) can NOT
C. (1) 1 and 2 (2) can
D. (1) 1 Only (2) can NOT
▶ Show Answer & Explanation
✓ A. Correct. Only the Group 1 Demand Steps input into the Plant Computer. Per S2.OP-DL.ZZ-0003 for Control Rod Counter channel checks, either the Group Demand Counter or Plant Computer will satisfy the surveillance for Group 1 only. Only the Group 1 Demand Steps input into the Plant Computer. TS 3.1.3.2.1.b, bases states in part, "...either the control console group 1 demand step counter or the plant computer 'bank step' display is sufficient to comply with this specification for group 1 rod position."
✗ B. Part 1 is incorrect. Plausible because the operator may believe that both groups are also displayed on the plant computer. Part 2 is incorrect. Plausible because the operator may believe that the Plant Computer cannot satisfy the surveillance requirement. Incorrect in that per S2.OP-DL.ZZ-0003, the Plant Computer Group Demand for Group 1 only will satisfy the surveillance and also that only group 1 demand is displayed on the plant computer.
✗ C. Part 1 is incorrect. Plausible because the operator may believe that both groups are also displayed on the plant computer. Part 2 is correct.
✗ D. Part 1 is incorrect. Plausible because the operator may believe that the failed step counter will generate E-24. Incorrect in that E-24 does not use input directly from the console step counters. Part 2 is incorrect. Plausible because the operator may believe that the Plant Computer cannot satisfy the surveillance requirement. Incorrect in that per S2.OP-DL.ZZ-0003, the Plant Computer Group Demand for Group 1 only will satisfy the surveillance.
Ref: S2.OP-DL.ZZ-0003 (R126), TS 3.1.3.2.1 bases | LO: NOS05RODS00-14, Objective 6 — Describe the function of the following components and how their normal and abnormal operations affects the Rod Control and Position Indication Systems: Rod Insertion Limit Comparator | Source: New | Cognitive: Comprehension/Analysis
Connections
- Related systems: RPS/SSPS
- Related procedures: S2.OP-DL.ZZ-0003 — Control Room Logs
- Related tech specs: TS 3/4.1.3 — Movable Control Assemblies
- Related exam: 2023 NRC Written Exam