Dynamic Analysis of Coolant Channel and Its Internals of Indian 540 MWe PHWR Reactor

Table 2

Natural frequencies of coolant channel for fault scenarios.

Case	Frequency (Hz)
	1st mode	2nd mode	3rd mode
Case 1 (design)	6.45	17.62	32.66
Case 2	6.42	17.05	30.05
Case 3	6.36	16.64	27.12
Case 4	6.41	17.59	25.65
Case 5	6.25	15.69	27.11
Case 6	4.99	13.55	27.30
Case 7	5.52	16.67	25.82
Case 8	4.02	17.53	31.92
Case 9	2.69	13.77	22.73
Case 10	2.66	13.55	26.43
Case 11	6.26	16.15	26.74
Case 12	6.41	17.59	29.71