DCL-16-112, Diablo Canyon-2016-10 Post Examination Comments
| ML16321A321 | |
| Person / Time | |
|---|---|
| Site: | Diablo Canyon  |
| Issue date: | 10/20/2016 |
| From: | Vincent Gaddy Operations Branch IV |
| To: | |
| References | |
| DCL-16-112 | |
| Download: ML16321A321 (19) | |
Text
High Miss Questions: All L161 NRC Written exam questions have been reviewed by the Training staff with the candidates. The following question was missed by 50% or more of the candidates and remediated with the class. Any additional actions are documented at the end of the question.
Question 02 - Pass rate: 3 of 9 (33.3%) GIVEN: Unit 1 is in MODE 3 Control Rods are incapable of being withdrawn RCPs 1-1, 1-2, are OPERABLE and running RCP 1-3 is inoperable for breaker replacement RCP 1-4 is stopped, OPERABLE and capable of being started 12 kV bus 1E supply breaker trips on overcurrent. Currently there is/are ________ and LCO 3.4.5, RCS LOOPS - MODE 3 is _______. A. two RCS Loops OPERABLE with one loop in operation; NOT met B. two RCS Loops OPERABLE with one loop in operation; met C. only one RCS Loop OPERABLE and in operation; NOT met D. only one RCS Loop OPERABLE and in operation; met Proposed Answer: B. two RCS Loops OPERABLE with one loop in operation; met Explanation: A. Incorrect because the LCO is met. Plausible because two loops are required to be in operation when rods are capable of being withdrawn. B. Correct. 12 kV bus 1E trips, de-energizing RCPs 1-1 and 1-3. RCP 1-2 is OPERABLE and in operation, RCP 1-4 is OPERABLE and stopped. In mode 3 with rods incapable of being withdrawn (reactor trip breakers open) only one loop is required to be in operation. C. Incorrect because two loops are OPERABLE. Plausible if RCPs 1-2 and 1-4 are thought to be on bus 1E and the others on 1D. D. Incorrect because two loops are OPERABLE. Plausible because only one loop is required to be in operation when rods are incapable of being withdrawn. Technical
References:
LCO 3.4.5 RCS Loops Mode 3; OIM J-1-1 References to be provided to applicants during exam: None Learning Objective: Discuss significant Technical Specifications and Equipment Control Guidelines associated with the RCP. Apply TS 3.3, 3.4, and 3.6 Technical Specification LCOs. Apply TS 3.3, 3.4, and 3.6 Technical Specification bases (SROs only). Question Source: Bank # (note changes; attach parent) Modified Bank # New X Question History: Last Two NRC Exams No Question Cognitive Level: Memory/Fundamental Comprehensive/Analysis DCPP L161 Exam Rev 0 10CFR Part 55 Content: 55.41.7 Difficulty: 3.5 Added "supply" before breaker Answer Breakdown: A 2 B 3 (correct) C 1 D - 2 Resolution: Required knowledge of RCP power supplies and "above the line" Tech Spec for RCS Loops while in MODE 3. RCP power supplies are required knowledge (LA-6 objective 6080 - State the power supplies to RCP components and adequately covered. The required loops in operation for the given MODE should be covered in the lesson material as part of objective 9697D, Discuss significant Technical Specifications and Equipment Control Guidelines associated with the RCP apply TS 3.4). There was a direct link between that particular LCO and the training material. Added this to the post-exam notification for evaluation for an enhancement to the ILT program to consider expanding the existing LCO workbook with additional emphasis on system LCOs.
Question 34 - Pass rate: 4 of 9 (44.4%) Difficulty: 3.3 Given: Unit 2 is at 100% power PK14-19, STATOR WTR CLG SYSTEM, alarms Turbine runback is indicated on the Triconix display and Main Generator MW are decreasing with no reactor trip What will the effect be on steam generator narrow range water levels and feed flow during the ramp? Narrow Range levels will initially ____________ and feed flow __________ steam flow. A. rise; will track B. rise, initially rises but quickly lowers and will be less than C. lower; will track D. lower; initially lowers but quickly rises and will be greater than Proposed Answer: D. lower; initially lowers but quickly rises and will be greater than Explanation: A. incorrect. Levels will lower due to "shrink" An increase in steam flow would cause levels to rise. Plausible, as at power both are in agreement. B. Incorrect. Levels will lower. Plausible - The feed flow response would be correct for the dominant level signal if level increased. C. Incorrect. Levels will lower. Plausible if its thought that feed flow will follow steam flow, which is lowering, this is correct. D. Correct. Levels will lower due to lowering steam flow. The feed system will respond by increasing flow to restore levels to program. Technical
References:
LC-8B, LPA-25, sim response to stator runback References to be provided to applicants during exam: None Learning Objective: Describe controls, indications, and alarms associated with the DFWCS. (37641) Question Source: Bank # S-53384 X (note changes; attach parent) Modified Bank # New Question History: Last Two NRC Exams No Question Cognitive Level: Memory/Fundamental Comprehensive/Analysis X 10CFR Part 55 Content: 55.41.7 / 45.5 Answer Breakdown: A 2 B 2 C 1 D 4 (correct) Resolution: Given that 4 of 9 candidates chose an answer that had feed flow initially rise, this indicates a generic class weakness and added to the post exam notification to enhance the ILT program to include a discussion of plant response to significant transients.
Question 51 pass rate: 3 of 9 (33.3%) Given: A loss of 230 kV and 500 kV power has occurred. The Operator notes the following indications for Diesel Generator 1-1, which is supplying its vital 4kV bus: Frequency: 58.5 hertz Voltage: 116 volts In accordance with limits listed in STP M-9A1 Diesel Generator Engine 1-1 Routine Surveillance Test, the frequency indication is (1) and the voltage indication is (2) . A. 1. within the limits 2. within the limits B. 1. within the limits 2. outside the limits C. 1. outside the limits 2. within the limits D. 1. outside the limits 2. outside the limits Proposed Answer: D. 1. outside the limits; 2. outside the limits Explanation: A. Incorrect because both voltage (117 to 120) and frequency (59.5 to 60.5 hz) is below the acceptable range for steady state operation . Plausible because while both are out, the diesel is given as carrying the bus and they are only 1 v or hz away from normal and with voltage, 116 is a meter mark (marks are every 2 volts). B. Incorrect because frequency is below the acceptable range, however voltage is not within limits. Plausible because these limits may not be known and this is within the "red" marks for bus voltage (diesel meter does not have the red marks). C. Incorrect because voltage is not within acceptable limits, however, frequency is not. Plausible, because these limits may be misunderstood or not known. D. Correct. The frequency and voltage limits during operation of the diesel generators are 59.5 to 60.5 hz, and 117 to 120 Volts. The both voltage and frequency are below the acceptable range. Technical
References:
OP J-6B:IV (page 6), STP M-9A1 (pages 6, 22) References to be provided to applicants during exam: None Learning Objective: Describe the operation of the Diesel Generator System. (6437) Question Source: Bank # (note changes; attach parent) Modified Bank # New X DCPP L161 Exam Rev 3 Question History: Last Two NRC Exams No Question Cognitive Level: Memory/Fundamental X Comprehensive/Analysis 10CFR Part 55 Content: 55.41.7 Answer Breakdown: A 1 B 0 C 5 D 3 (correct) Resolution: Requires knowledge not tested during systems, but gathered during on-shift and simulator training. Normal operating limits, while not stressed in class, is expected knowledge by the conclusion of the program. No further action necessary.
Question Number24question - Is this the right name for 477? I've seen something about return to ERD for 477 (currently states " Discharge Recirc Valve")response - go with the name you have on the questionupdate - put out to class (and on board) that RCV-18 is AKA as "liquid waste overboard" and FCV-477 AKA "Liquid Radwaste Overboard Return to ERDS"91question - per calendar year? response - reread stem "per the ecg" (as stated in the question)98question - asked for clarification of #3(do you mean per M-45). response - answer based on information given17question - is the MSIV the one with the faulted SG?response - reread the question.21question - lamacoid on VB5 has different nomenclature than question; can I get the names?response - no. answer based on information given76question - have we depressurized to inject accumulators yet?response - answer based on information given CANDIDATE1234567891011SRO1XXXXXXXXXXDSRO2AAXXXXXXXXXSRO3XAXXXCXXXXXSRO4XDXXXCXXXXXSRO5XXXXXCXCXXXSRO6XCXXXXXXXXXSRO7XDXXXXXXXXXSRO8XAXXXXDCXXXSRO9XXXXXCXXXXXANSWERCBBCAACBAAC88.89%33.33%100.00%100.00%100.00%55.56%88.89%77.78%100.00%100.00%88.89%CANDIDATEGradeRO OnlySRO OnlyROSROSRO191.9%91.89%92.00%6823SRO292.9%91.89%96.00%6824SRO389.9%87.84%96.00%6524SRO489.9%89.19%92.00%6623SRO581.8%78.38%92.00%5823SRO694.9%93.24%100.00%6925SRO787.9%87.84%88.00%6522SRO887.9%87.84%88.00%6522SRO990.9%91.89%88.00%6822AVERAGE89.79%88.89%92.44%6623 12131415161718192021222324XXXXXXXXXXBXXXXXXXXXXCXXXXXXXXXXXXXXXXXXXXXXBXXXXXXXXDXXXXXXXBXXXXXXXXXXXXXXXXXDXXXXXCXXXXXXXXXXXXXXXXXXXDXXXXXDXXCXXDBDBBDBAACBAD100.00%66.67%100.00%100.00%100.00%88.89%100.00%77.78%88.89%88.89%77.78%100.00%100.00%
25262728293031323334353637XXXXXXXXXAXXXXXXXXDXXXXXXXXXXXCXXDXCXXXXXXXXXXXXXXXXXXDXXXXXXBXXAXXXXXXXXXAXXXXXXXXXXXXXDXXXXXXXXXXXBXXXXXXXXXXXXXXXXDACBDACBBDBBD100.00%100.00%88.89%100.00%88.89%88.89%100.00%88.89%100.00%44.44%88.89%100.00%88.89%
38394041424344454647484950XBCXXXXXXXAXXXDXXXXXXXXXXXXXCXXXXAXXAXXXXXXBXXXXXXXXXBXBBXXXXXXXCXXXXBXXXXXXXXXXXXXXXAXXXDXXBXXXXXXAXXXXXXXXXXXXXXCXXACDCAABBDCBCA100.00%55.56%77.78%88.89%66.67%100.00%100.00%77.78%88.89%100.00%66.67%88.89%88.89%
51525354555657585960616263XXXXXXXXXXXXXXXXXXXXXXXXCXXXXXXXXXXXAXXXXXXXXXXXCAXXAXXXXBXXCXXXXXXXXXXXCXXXXXXXXXXXCBXXXXXXXXXXXXXXXXXXXXXXDDBBCADDBDAB33.33%77.78%100.00%100.00%88.89%100.00%100.00%100.00%100.00%88.89%100.00%100.00%
64656667686970717273747576XXXXXXXXXXXXCXXBXXXXXXXXXXXXXXXXXXXXXXXXCXXXAXXXXXCXXXXXXXBXXXXXXXXXXXAXXXXXXXXCXXXAXXXXXXXXXXXXXXXXXXCCXXXXXXBXXXXXXCAABABDBCBADA100.00%77.78%88.89%100.00%100.00%66.67%77.78%100.00%100.00%100.00%100.00%77.78%77.78%
77787980818283848586878889XXXXXXXXXXXCXXXXXXDXXXXXXXXXXXXXXXXXXXXXAXXXXXXCXXXXXXXXXXXAXXXDXXXXXXXXXXXXXXXAXXDXXAXXXXXXAXXXXXAXXXXXXXXXXXXXXXXBXCDCACBDDACBAD100.00%66.67%100.00%100.00%88.89%88.89%100.00%66.67%88.89%100.00%100.00%66.67%100.00%
90919293949596979899100XXXXXXXXXXXXXXXXXXXXXXXXXXXXDXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXAXXCCBACCDACACD100.00%100.00%100.00%100.00%100.00%100.00%88.89%88.89%100.00%100.00%88.89%
Post exam changes following exam administration. On November 7, 2016, the licensee notified the NRC that a question administered as part of the written exam was not the version that was approved on October 4, 2016. The issue is discussed in Section 4OA7 of the inspection report. The NRC determined in accordance with NUREG 1021, Revision 10, Section 403.D.1.b, that the question would be removed from the exam due to being an unintended typographical error in the question and answer key.