Modelling and Validation of CANDU Shim Operation Using Coupled TRACE/PARCS with Regulating System Response

Table 4

Comparison of station data and simulations on shim transient timings (in days). Uncertainties are stated as one standard deviation.

Case	Zero banks out	One bank	Two banks	Three banks	Total
Station	12.47	5.38	6.19	3.92	27.95
0 EFPH	11.51	3.91	6.05	4.95	26.42
154008 EFPH	11.36	3.69	5.80	4.55	25.40
182500 EFPH (ref.)	11.33	3.64	5.77	4.46	25.20
195000 EFPH	11.32	3.62	5.76	4.42	25.12
90% LZC weight	11.14	3.56	5.73	4.48	24.91
12 plane nodalisation	11.03	3.48	5.60	4.27	24.39
26 plane nodalisation	11.25	3.54	5.68	4.32	24.79
Nuclear data unc	11.38 ± 0.55	3.67 ± 0.23	5.80 ± 0.25	4.45 ± 0.29	25.29 ± 1.31
No refuel reference	9.76	3.63	4.30	4.55	22.24
Burnup distribution unc	n/a	3.74 ± 0.09	4.47 ± 0.06	4.72 ± 0.14	n/a
Burnup + data unc	n/a	3.98 ± 0.31	4.55 ± 0.28	4.79 ± 0.18	n/a

The bolded rows denote the real world results as well as corresponding best-estimate simulations; the nonbolded rows are sensitivity cases.