ML23115A355

10-CGS-2023-02 Post Exam Comments

ML23115A355
Person / Time
Site:	Columbia
Issue date:	03/09/2023
From:	Robertson K Energy Northwest
To:	NRC Region 4
References
50-397/23-301 50-397/OL-23
Download: ML23115A355 (1)

Text

Evaluation of high miss questions for ILC-25 NRC Exam.

RO-6: 61.5% pass rate All incorrect answers selected A. Question is correct as written.

Weak Area: ABN-CR-EVAC This demonstrates a weakness of operations of the SW-B system from the remote shutdown panel per ABN-CR-EVAC. SW-V-2B does not automatically open on system start when operated from the Remote Shutdown panel, which is different than normal operation of the SW-B system from the Main Control Room.

RO-11: 0.0% pass rate 11 of 13 Candidates selected B. Question is correct as written.

Weak Area: 5.2.1 Primary Containment Control (5.0.10A Bases)

Most candidates correctly analyzed that initiation of Drywell sprays prevents chugging by allowing for non-condensable gases to enter the Drywell from the Wetwell. All candidates incorrectly said that Drywell sprays were designed to prevent over pressurization of the containment which is incorrect per 5.0.10A.

RO-18: 7.7% pass rate 10 of 13 Candidates selected D. Question is correct as written.

Weak Area: ABN-RAD-RELEASE / SOP-HVAC/CR-OPS Candidates confused a Z signal with a situation where CR habitability is impacted by an OUTSIDE source such as the DOE burial grounds. Candidates also had problems with the SOP definitions of Recirculation and Pressurization modes of operation.

RO-20: 69.2% pass rate 3 of 4 incorrect responses selected C. Question is correct as written but could be enhanced, stating that Generator Sync Voltage is matched with grid voltage in the stem could have led candidates to think that proceeding with the synchronization. The grid would never be in such a condition. Enhance by removing the Generator Sync voltage statement from the initial conditions.

Weak Area: Annunciator response for Main Generator Overexcitation Majority of incorrect responses indicated that they would continue the MG synchronization and close the ASHE breaker. This answer would be correct prior to reaching the alarm set point. Once the alarm set point is reached the ARP directs lowering Main Generator Excitation Voltage.

RO-22: 30.8% pass rate 7 candidates chose distractor C / 2 candidates chose distractor A.

Question is correct as written.

Weak Area: ABN-FAZ 11 of 13 candidates correctly identified that SGT would maintain secondary containment pressure at -1.7hg. Weakness on knowledge of CR HVAC alignments. Similar weakness demonstrated on question RO18.

RO-35: 46.2% pass rate All incorrect candidates selected C. Question is correct as written.

Weak Area: PRNM (APRM Rod blocks)

All candidates correctly selected that a 1/2 scram does not exist (part 2 of the question).

Candidates incorrectly identified that a rod block does not exist, rod block only requires 1 APRM rod block signal to generate a rod block and is not the same logic as a scram signal.

RO-47 69.2% pass rate.

Weak Area: System response on FA reset. Question is correct as written.

Various incorrect selections demonstrating a lack of understanding of RCC system response when recovering from FA signal.

RO-69 46.2% pass rate.

6 of 7 candidates chose distractor selected C. Question is correct as written.

Weak Area: PPM 1.3.1 Operations report times.

Candidates have a weakness in the reportability times for operations. Candidates could have confused report time with EAL classification time.

RO-70 61.5% pass rate.

Question is correct as written (Modified from a NRC GFE bank question to make it plant specific)

Various distractors selected.

Weak Area: Reactor Theory (Control Rods)

Candidates demonstrated a weakness to neutron flux response to control rod withdrawal with a reactor in a subcritical state.

SRO-78 66.7% pass rate.

Correct Answer is A. Two candidates chose distractor B. Question is correct as written.

Weak Area: K Candidates demonstrated a weakness on actions to direct during a loss of CIA header pressure.

withdrawal with a reactor in a subcritical state.

SRO-79 33.3% pass rate.

Correct Answer is D. One candidate chose distractor B and three candidates chose distractor C. Question is correct as written.

Weak Area: K Candidates demonstrated a weakness on required monitoring of RPV metal temperatures based on RPV level and amount of coolant recirculation when a loss of SDC occurs.

SRO-80 66.7% pass rate.

Correct Answer is A. One candidate chose distractor B and one candidate chose distractor D. Question is correct as written.

Weak Area: K Candidates demonstrated a weakness on SRO-84 66.7% pass rate.

Correct Answer is A. Two candidates chose distractor D. Question is correct as written.

Weak Area: K Candidates demonstrated a weakness on SRO-85 50.0% pass rate.

Correct Answer is B. Three candidates chose distractor A. Question is correct as written.

Weak Area: K Candidates demonstrated a weakness on SRO-89 33.3% pass rate.

Correct Answer is D. Three candidates chose distractor A and one candidate chose distractor C. Question is correct as written.

Weak Area: K Candidates demonstrated a weakness on actions to direct following the occurrence of a SBO to correct, control, and mitigate effects on the DC Electrical DistributionSRO-92 66.7% pass rate.

Correct Answer is C. Two candidates chose distractor D. Question is correct as written.

Weak Area:

Candidates demonstrated a weakness on the application of TS LCO 3.0.4 when the RWM is inoperable.SRO-95 0.0% pass rate.

Correct Answer is B. All candidates chose distractor A. Question has been analyzed and has two correct answers, A and B.

SRO-100 66.7% pass rate.

Correct Answer is C. Two candidates chose distractor B. Question is correct as written.

Weak Area:

Candidates demonstrated a weakness on identifying the responsible manager for completing Emergency Classifications once all Emergency Response Centers are staffed and activated.

Issue: Question SRO-95 has two right answers, A and B.

Analysis: SRO-95 was originally a bank question (2019 NRC Exam SRO-93). When reviewed by NRC, CGS was requested to make the control rods different than the bank question. When modified, the facility mistakenly chose two combinations of control rods (A and B) that did not violate control rod separation criteria instead of only one (B). Rod 46-47 was selected vice rod 46-43. Recommend accepting both A and B as correct.

Question:

CGS is in Mode 1.

While performing a control rod pattern exchange, Rod 42-39, is found to be stuck at position 42.

The CRS enters LCO 3.1.3, Control Rod OPERABILITY, Condition A, One withdrawn control rod stuck.

The CRS is verifying that stuck control rod separation criteria are met in accordance with Required Action A.1.

Using the reference provided, which of the following combination of control rods, considered to be slow in accordance with LCO 3.1.4, will not violate control rod separation criteria?

A. 38-35, 46-31 and 46-47 B. 34-35, 34-43 and 42-35 C. 42-31, 46-39 and 50-39 D. 38-39, 50-31 and 50-35 Answer: B Explanation: See next page.

A. 38-35, 46-31 and 46-47 (Meets Separation Criteria)

B. 34-35, 34-43 and 42-35 (Meets Separation Criteria)

C. 42-31, 46-39 and 50-39 (Does NOT Meet Separation Criteria - See b) above)

D. 38-39, 50-31 and 50-35 (Does NOT Meet Separation Criteria - See c) above)