Power plants of the second generation

Compartment with MCC components Permissible (excess) pressure (kPa) at Leningrad 1,2 and Kursk 1, 2 

Steam-water lines, drum separator, downcomers and steam lines 25.0 

The maximum permissible pressures in the ALS and other compartments at Smolensk 1 and 2 and Kursk 3 and 4 are presented in Table 8. Leaktight compartments have safety valves with an opening pressure difference of 270 kPa. Opening them allows the steam and gas mixture to be vented from the ALS to the atmosphere. 

The ALSs at Leningrad 3 and 4 and Ignalina 1 and 2 operate in the following manner in the case of MCC pipe breaks inside leaktight compartments or in DGH-LWL compartments, the steam and gas mixture will be vented into the accident localization tower (ALT) via a steam discharge passage. With pipe breaks in the upper part of the circuit (drum separator compartments or the space above the reactor), excess steam will be vented 

TABLE 8. MAXIMUM PERMISSIBLE PRESSURES IN COMPARTMENTS (SECOND GENERATION RBMKs SMOLENSK 1 AND 2, KURSK 3 AND 4) 

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