Detection of the Departure from Nucleate Boiling in Nuclear Fuel Rod Simulators

Table 1

Experimental results.

Test	Rod	Power; [W]	Heat flux; [W/cm^2]	Time; [s]	Temperature (maximum); [°C]	Rod dilation; [mm]	Thermocouple delay; [s]
2	2	0	0.0	0	52	0.05
		966	5.1	86	76	0.06
		3093	16.4	131	92	0.07
		4656	24.6	167	103	0.07
		8286	43.8	215	103	0.08
		10101	53.0*	242	103	0.70
		0	0	253	250	0.20	11
3	2	0	0.0	0	65
		1019	5.4	178	100
		4042	21.4	214	100
		6180	32.7	228	100
		7713	40.8	233	100
		9049	47.8	239	100
		10626	56.2*	257	100
		0	0.0	310	100		54
4	2	0.0	0	0	74
		9.0	36	36	76
		23.0	90	90	102
		33.2	122	122	102
		48.2	142	142	102
		57.0*	150	150	102
		0.0	—	—	102		Not detected
13	3	0	0.0	0	53
		1717	10.4	45	59
		3647	22.0	138	96
		6397	38.7	159	99
		9270	56.0	169	99
		13869	83.8*	184	100
		0	0.0	—	100		Not detected
14	3	0	0.0	0	20	0.4
		4558	27.5	135	96	1.0
		5622	34.0	173	107	0.8
		12050	72.8	205	110	0.7
		14440	87.3*	211	210	1.3
		0	0.0	232	185	0.2	22

*Departure from nucleate boiling.