Sensitivity Studies for the Exercise I-1 of the OECD/UAM Benchmark

Table 11

Comparison between HELIOS and NEWT sensitivities for TMI-1.

Parameter	Variation	Δρ (pcm)
		NEWT		HELIOS
		HZP	HFP	HZP	HFP
Fuel density	+0.17 g/cm^3	−97	−104	−95	−101
Fuel pellet diameter	+0.013 mm	−19	−20	−21	−23
Gap thickness
from outside	+0.024 mm	−84	−91	−68	−73
from inside	+0.024 mm	69	74	78	84
Clad thickness
from outside	+0.025 mm	−104	−110	−100	−106
from inside	+0.025 mm	−16	−15	−29	−30
^235U concentration	+0.00224 w/o	4	4	3	4