ML081770385
| ML081770385 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 06/18/2008 |
| From: | Helsel J Susquehanna |
| To: | Caruso J NRC Region 1 |
| Caruso J | |
| Shared Package | |
| ML072140644 | List: |
| References | |
| PLA 006380 | |
| Download: ML081770385 (6) | |
Text
Susquehanna Learning Center 769 Salem Boulevard Berwick, PA 18603-0467 570-542-3353 June 18,2008 Mr. John Caruso USNRC Chief Examiner USNRC Region 1 475 Allendale Road King of Prussia, PA 19406-1 41 5 Susquehanna Learning Center Formal Post-Examination Comment Q2 PLA 006380
Dear Mr. Caruso:
In accordance with the guidance provided in NUREG 1021, Operating Licensing Examination Standards for Power Reactors (Revision 9 Supp 1) ) ES-403 Grading Initial Site-Specific Written Examinations, the following formal post exam comment is being submitted to justify changing the answer key for Question #2 of the Susquehanna Initial Licensing Examination that concluded on May 16,2008.
If you have any questions, or require more information, please contact me at 570-542-351 0 or Chris Michaels at 570-542-3734.
Manager-Nuclear Training
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SSES RO Written Exam Question #2 - Justification, Dated 05/29/2008 W
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R. M. Fry M. Crowthers Ops Letter File Nuc Records - NUCPT CM/Post Exam Material Q2061808/nk
c SSES RO Written Exam Question #2 - Justification 05/29/2008 In accordance with the guidance provided in NUREG 1021, Operating Licensing Examination Standards for Power Reactors (Revision 9 Supp 1 ) ES-403 Grading Initial Site-Specific Written Examinations the following is the justification for changing the answer key to Question #2 on the NRC RO written examination given on 5/16/2008.
Choice C states The Auxiliary Oil Pump (AOP) will automatically start when control oil pressure, as sensed at the discharge of the main lube oil pump, is less than 35 psig. Control oil will be maintained and the Stop valve remains open.
Pressure Reducing Valve (PCV-15616) will maintain lubricating oil to turbine and pump bearings at 35 to 40 psig.
During post examination grading and review it was determined that the correct answer is choice C. AR# 1031 434 written in response to requesting the change to Question #2 on the NRC written Exam.
Refer to the following logic print (ref. 2): When a HPCl Initiation signal is received relay (K6) is energized and is sealed-in. The seal-in on relay (K6) can be reset by the HPCl Initiation logic RESET pushbutton (S17) when all HPCl initiation conditions are clear.
Refer to the following logic prints (ref. 1 and 2): When relay K6 is energized, contacts 3 and 4 close which energize relay K60 in the HPCl Aux Oil Pump control logic. Relay K60 is sealed-in through the HPCl Aux Oil Pump control switch (HS-15660) identified as (S20).
The switch development for the HPCl Auix Oil Pump Control Switch (S20) is provided below (ref. 1). Control switch (S20) contacts 5 and 6 are closed in STOP or AUTO, and contacts 1 and 2 are closed in AUTO or START.
Since the HPCl Aux Oil Pump control switch is maintained in the AUTO position, relay K60 remains energized and sealed-in until the HPCl Aux Oil Pump control switch is taken out of the AUTO position.
0 SWITCH INlACTS RMAL AUTO I
SWITCH CONT SH DESiE NO 1 - 2 4
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J Refer to the following logic print (ref. 3): 'With relay K60 energized, contacts 2 and 8 (in the HPCl Aux Oil Pump control logic for the breaker) will remain closed and the pump will automatically start when oil pressure lowers to 35 psig as sensed by (PS-1).
LE In conclusion, the stem of Question #2 stated that the HPCl initiation signal was generated and subsequently reset by the operator using the HPCl Initiation logic RESET pushbutton (S17) (Relay K6 was energized and subsequently deenergized). Since the HPCl Aux Oil Pump control switch (S20) remained in the AUTO position, relay K60 remains sealed-in and energized which causes the Aux Oil Pump to automatically start when oil pressure lowers to 35 psig.
As part of the question review, the staff determined that the Simulator correctly models the HPCl Aux Oil Pump control logic, as discussed above. Further, a review of the plant surveillance test, SO-1 52-002, QUARTERLY HPCl FLOW VERIFICATION (ref. 4), determined that the HPCl Aux Oil Pump control logic (Relay K60) is exercised in an identical sequence as stated in Question #2. Thus, the operation of the HPCl Aux Oil pump seal-in logic as provided in the elementary logic diagrams agrees with the simulator modeling and actual plant surveillance testing.
Question #2 choice D was the originally intended answer. The basis for this answer was the training material, TM-OP-052-ST rev 01, which incorrectly stated that the HPCl Aux Oil Pump logic seal-in would dropout when the Initiation Logic was reset. Without the seal-in, the pump would not automatically start. The training staff determined that the training material is incorrect and this deficiency was entered in the Susquehanna Corrective Action Program (AR# 1032082). The TM-OP-052-ST was revised (rev 02 dated 05/27/2007) to correctly reflect the HPCl pump AOP seal-in logic.
The training staff recommends that Question #2 choice C be the correct technical answer and choice D be an incorrect answer. Choices A and B are still incorrect answers and remain unaffected.
SSES Station
References:
- 1) M1 -E41 -69, HPCl Elementary Logic print (Sheet 2 rev 15)
- 2) M1 -E41 -69, HPCl Elementary Logic print (Sheet 4 rev 10)
- 3) E-1 52, Schematic Diagram HPCl Turbine Auxiliary Oil Pump (Sheet 4 rev 12)
- 4) SO-152-002, Quarterly HPCl Flow Verification (rev 43)
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