ML090200108

RB-2008-12 - Post Exam Comments-analysis

ML090200108
Person / Time
Site:	River Bend
Issue date:	11/21/2008
From:	NRC Region 4
To:	Entergy Operations
References
50-458/08-301
Download: ML090200108 (2)

Text

2008 River Bend Station Initial License Examination Question Analysis In accordance with Item 6 of NUREG 1021 ES-403-1, Written Examination Grading Quality Checklist, an analysis was performed on those questions missed by half or more of the applicants. The results of this analysis are as follows: Question 15: 7 of i2 appiicants seiected "C". The correct answer is "5". The remaining 5 applicants correctly selected "B". "B" is correct because the EOPs have the operator verify that suppression pool level is >I3 feet prior to opening SRVs for Emergency Depressurization.

Choice "B" is the lowest value given that is still above 13 feet. The popular choice "C" is the value which corresponds to the low suppression pool level value which requires Emergency Depressurization.

The question is valid as administered.

Question 20: 7 of 12 applicants answer this question incorrectly. The correct anwer "C" was selected by the remaining 5 applicants.

Of the 7 incorrect answers, 4 selected "A and 3 selected "D". A review of STM-310 determined that "C" is correct. Refer to STM-310 Page 31 of 53.

At 57 Hz, the Volts/Hertz circuit develops a take over signal to drive excitation down as frequency decreases to protect frequencyholtage sensitive components of the regulator. The question is valid as administered.

Question 47: 10 of 12 applicants answered the question incorrectly.

Of the 10, 9 selected "D" and 1 selected "A. The correct answer is "C". I'D" is incorrect; because the white control power light is extinguished when the breaker is in the TEST position because the 52H contact is only closed when the breaker is in OPERATE. "A' is incorrect because the red light is illuminated when the contro! fnses are instal!ed with the breaker CLOSED in the TEST positior!.

The qnestior!

is vaiid as administered.

Question 68: 8 of 12 applicants answered the question incorrectly. Of the 8, 4 selected "A' and 4 selected "C". The correct answer is "5". TRM 3.4.13 lists the operating limit for reactor coolant conductivity as 51 .O pmhos. The question is valid as administered.

Quesiiuri 83 3 of 5 applicants answered the question incorrectly. All 3 selected "C". "C" is incorrect, because there is no parameter driving entry into EOP-0001.

"B" is correct because the operating limit of 90°F has been exceeded. The operating limit is the value assumed in the accident analysis. If a LOCA occurs at a value below the operating limit, it can be assured the containment design limit will not be exceeded.

With containment temperature at 91"F, it can not be assured that containment design temperature will not be exceeded if a LOCA were to occur. The question is valid as administered.