FINAL - E X A M

Special Problems in Nuclear Thermal-Hydraulics

Dec. 11,  2008

1. A dynamic pressure reading (in

inches of [eqn: H_2 O]) was made by 10

different  students from a

pressure gauge connected to a

Pitot probe exposed to "constant"

flow conditions. The 10 readings

were as follows:

1.15 , 1.14 , 1.01 , 1.10, 1.11 ,

1.09 , 1.10 , 1.10 , 1.55 , 1.09

Calculate followings ;

(1) arithmetic mean

(2) precision limit

(3) 95% confidence level

(4) By applying the Chauvenet's

criterion, recalculate (1)~(4).

(5) Describe the effect of Non-

Gaussian  error distribution.

2. Explain what does "95% probability with 95% confidence level" mean.

3 You want obtain a heat transfer coefficient for He cooling in TBM with the form

of

Nu = a Reb Prc ,  where a, b and c are experimental constant.

After obtaining the experimental data, how do you determine the uncertainty of      your correlation and draw the error bar in your data figures?

4. Explain RIR Option 3 and discuss the advantage and disadvantage of RIR.

5. Describe the purpose, the subject and the scaling of ATLAS integral test facility.

TABLE 1 Chauvenet's Criterion for Rejecting a Reading
Number of Readings (N)	Ratio of Maximum Acceptable Deviation to Precision Index([eqn: x_max / S_X])
3	1.38
4	1.54
5	1.65
6	1.73
7	1.80
8	1.87
9	1.91
10	1.96
15	2.13
20	2.24
25	2.33
50	2.57
100	2.81
300	3.14
500	3.29
1,000	3.48