Experimental Studies for the VVER-440/213 Bubble Condenser System for Kola NPP at the Integral Test Facility BC V-213

Table 8

Main experimental/calculated parameters characterizing loads on BC and boxes.

No.	Parameter	Test^(a)
		Test 4; LB LOCA	Test 5; LB LOCA	Test 1; LB LOCA	Test 7; MSLB	Test 9; MSLB	Test 12; SB LOCA
(1)	Maximum absolute pressurein box 𝑉1, (MPa)	0.202	0.214	0.197	0.1835	0.175	0.111
		0.224	0.232	0.204	0.185	0.179	0.118
(2)	Maximum absolute pressure in gasroom 𝑉4, (MPa)	0.191	0.199	0.194	0.177	0.169	0.107
		0.206	0.210	0.195	0.180	0.173	0.110
(3)	Maximum absolute pressure in air trap 𝑉5, (MPa)	0.193	0.200	0.191	0.177	0.168	0.106
		0.191	0.196	0.193	0.180	0.174	0.113
(4)	Maximum pressure difference across BC, (kPa)	14.55	15.73	11.62	7.8	7.7	4.9
		16.9	17.4	13.9	6.5 ^(b)	6.7 ^(b)	5.5
(5)	Maximum pressure difference across check valve, (kPa)	50.6	54.3	37.8	13.6	10.9	1.3
		64.8	67.2	55.9	18.1	15.7	1.6
(6)	Maximum temperature in box 𝑉1, (°C)	120	122	120	118	118	86
		124	125	121	172	181	101
(7)	Maximum temperature of BC water^(c), (^∘C)	78	78	60	56	63	38.5
		77	78	64	52	53	35
(8)	Average temperature of BC water^(d), (°C)	61	59	45	48	52	36
		77	78	64	52	53	35

^(a)Experimental results are presented in upper part, calculation ones—in the lower part of table’s cells;
^(b)calculated values are the first peaks; due to COCOSYS model specifics only first pressure difference peak is reproduced in calculations;
^(c)calculated values of maximum temperature are obtained at the end of calculation: for Test 4, Test 5, and Test 1 values are given at 100 s, for Test 7, Test 9, and Test 12—at 1800 s. Experimental values of maximum temperature are observed for Test 4 during interval ~55–230 s, for Test 5 during interval ~45–85 s, for Test 1 during interval ~160–250 s, for Test 7 during interval ~800–1800 s, for Test 9 during interval ~1100–1800 s, and for Test 12 during interval ~2700–5000 s;
^(d)for Test 4, Test 5, and Test 1 values are given at 100 s, for Test 7, Test 9, and Test 12—at 1800 s. Calculated maximum and average temperatures of BC water are equal to each other due to using of only one node for BC pool in calculation.