Input decks for Ignalina NPP

RELAP5 model for the INPP

3. ANALYTICAL METHODS AND CALCULATIONS

The following general rules were followed in the RELAP5 model development:

The RELAP5 code version to be used in the analysis is RELAP5/MOD3.2. All inputs are consistent with this code version. This code is described in Ref. [1].
The input requirements are described in detail in Volume II, Appendix A of Ref. [1].
All inputs and the output are in SI units.

Component names begin with an "l" for LHS components, and an "r" for RHS components.

Figure 1. Ignalina Model Nodalization Diagram

Table 1. Node Descriptions

Node Number	Component Modeled	Node Number	Component Modeled
100 - 103, 500 - 503	Steam Drums	155, 555, 655, 755, 855, 158, 558, 658, 758, 858, 157, 557, 657, 757, 857, 159, 559, 659, 759, 859	Reactor Core Inlet Piping
105, 505, 107, 507, 110, 510	Feedwater Model	160, 560, 660, 760, 860	Reactor Core Piping
120, 520	Downcomers	161, 561, 661, 761, 861, 163, 563, 663, 763, 863	Reactor Core Outlet Junction
125, 525	Main Coolant Pump (MCP) Suction Headers	162, 562, 662, 165, 565, 665, 765, 865	Reactor Core Outlet Piping and Reactor-to-Steam Drum piping
126, 526	Pressure Bypass Lines until Check Valve	170, 570	Steam Removal Piping and Headers
127, 128, 527, 528	Bypass Check Valves and Pressure Bypass Lines behind Check valve	175	Steam Lines
130, 530, 630, 830	MCP Suction Piping	176	Junction between Left Side and Right Side Steam Lines
135, 535, 635, 835	MCPs	182, 582, 183, 583	Steam Dump Valves (SDV-As)
140, 142, 540, 542, 640, 642, 840, 842	MCP Discharge Piping from Pump until Throttling Valve and behind Throttling Valve	180, 181, 184, 185, 186, 187, 580, 581, 584, 585, 586, 587	Main Safety Valves (MSVs)
141, 541, 641, 841	MCP Throttling Valve and Check Valve	190, 590, 191, 591	Steam Dump Valves (SDV-Cs)
145, 545	MCP Discharge Header	197, 198	Steam Dump Valve (SDV-D)
146, 546, 646	Group Distribution Header (GDH) Inlet Pipes	194, 594, 195, 595, 196, 596	The Steam Lines to TCVs and Turbine Control Valves (TCVs)
147, 547, 647	Group Distribution Header (GDH) Check Valve	303, 314, 315, 316, 318, 319, 320, 330, 332, 333, 334, 335, 337, 339, 350, 351, 352, 439, 450, 451, 452	Emergency Core Cooling System (ECCS) Model & Emergency Feedwater Model
150, 550, 650	GDH
152, 552, 652, 752, 852	Flow Control Valves

The discussion below provides specific inputs organized by input "cards" as described in Ref. [1]. The overall organization of this section is as follows:

3.1 General Problem Parameters

3.2 Hydrodynamic Volumes and Junctions

3.3 Heat Structures

3.4 Heat Structure Thermal Property Data

3.5 Point Kinetics