ML18022A243
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BFN-26 TABLE 6.5-1 PLANT PARAMETERS USED LOCA ANALYSIS GE Analysis FANP Analysis Plant Parameters Nominal Appendix K Appendix K Core Thermal Power (MWt) 3458 3527 3527 Corresponding Power 100% of 3458 MWt 102% of 3458MWt 102% of 3458 MW Vessel Steam Output (lbm/hr) 14.2 x 106 14.5 x 106 14.47 x 106 Rated Core Flow (lbm/hr) 102.5 x 106*
102.5 x 106*
102.5 x 106**
Vessel Steam Dome Pressure (psia) 1050 1053 1054 Maximum Recirculation Suction Line Break Area (ft2) 4.24 4.24 7.013***
Maximum Recirculation Discharge Line Break Area (ft2) 1.96 1.96 7.013***
Low Pressure Core Injection Valve Pressure Permissive for Opening (psig) 335 335 335 Core Spray Injection Valve Pressure Permissive for Opening (psig) 335 335 335 Recirculation Pump Discharge Valve Pressure Permissive for Closure (psig) 200 200 200 Diesel Start and Ready to Load (seconds) 20 (Suction Break) 23 (Discharge Break) 20 (Suction Break) 23 (Discharge Break) 20 (Suction Break) 23 (Discharge Break)
- Note: Limiting LOCA cases were analyzed for a core flow range of 83 to 107.6 Mlb/hr for 105% OLTP conditions.
- Note: Maximum break area is for double-ended recirculation or discharge pipe break, which is twice the pipe cross section area.
BFN-26 TABLE 6.5-2 ECCS EQUIPMENT CAPACITY ASSUMED IN LOCA ANALYSIS Function Number Installed Flow HPCI 1
3,600 gpm at 1174 psid, linearly increasing to 5,000 gpm at 1120 psid; 5,000 gpm between 1120 psid and 150 psid within 35 seconds.
ADS Valves 6
800,000 lb/hr per valve at 1125 psig Core Spray System 2 (two pumps for each system) 5600 gpm at 105 psid per two CS pumps
- LPCI Pump 4
9400 gpm at 20 psid per pump on one loop; 17,300 gpm at 20 psid per two pumps on one loop **
NOTE: psid - pounds per square inch differential between reactor vessel and primary containment (torus)
- Both GEH and FANP Analyses assum 5,435 gpm sprays inside of shroud after accounting for 40 gpm total leakage for LPCS as-built openings, core spray thermal sleeve-safe end connection and quarter inch high point vent hole in core spray vent hole. Also included are 125 gpm for leakages due to downcomer repairs.
- Both GEH and FANP Analyses assume 8,640 gpm and 16,540 gpm (1 pump and 2 pumps in a loop) injected into the shroud after accounting for 600 gpm leakage principally around the jet pumps and 160 gpm access hole cover leakage.
BFN-26 TABLE 6.5-3 SINGLE FAILURE EVALUATION USED FOR LOCA ANALYSIS Remaining Systems*,
Assumed Failure Recirculation Suction Break Recirculation Discharge Break Disposition Battery SF-BATTlBA§ 6 ADS, 1 LPCS, 2 LPCI 6 ADS, 1 LPCS Analyze Battery SF-BATTlBB§ 4 ADS**, HPCI, 1 LPCS, 2 LPCI 4 ADS**, HPCI, 1 LPCS Analyze Battery SF-BATTlBC§,
4 ADS, HPCI, 1 LPCS, 3 LPCI 4 ADS, HPCI, 1 LPCS, 1 LPCI Bounded by SF-BATTlBB SF-LOCA (U1 & 2 only) 6 ADS, HPCI, 1 LPCS, 2 LPCI 6 ADS, HPCI, 1 LPCS Bounded by SF-BATTlBA and SF-BATTlBB SF-LPCI (Injection Valve) 6 ADS, HPCI, 2 LPCS, 2 LPCI 6 ADS, HPCI, 2 LPCS Bounded by SF-BATTlBA and SF-BATTlBB SF-DGEN (Diesel Generator) 6 ADS, HPCI, 1 LPCS, 2 LPCI 6 ADS, HPCI, 1 LPCS Bounded by SF-BATTlBA and SF-BATTlBB SF-HPCI 6 ADS, 2 LPCS, 4 LPCI 6 ADS, 2 LPCS, 2 LPCI Bounded by SF-BATTlBA SF-ADSlIL (Initiation Logic) 4 ADS, HPCI, 2 LPCS,4 LPCI 4 ADS, HPCI, 2 LPCS, 2 LPCI Bounded by SF-BATTlBB SF-ADSlSV (Single Valve) 5 ADS, HPCI, 2 LPCS, 4 LPCI 5 ADS, HPCI, 2 LPCS, 2 LPCI Bounded by SF-BATTlBB Each LPCS means operation of two core spray pumps in a system. It is assumed that both pumps in a system must operate to take credit for core spray cooling or inventory makeup. Furthermore, 2 LPCI refers to two LPCI pumps into one loop, 3 LPCI refers to two LPCI pumps into one loop and one LPCI pump into one loop. 4 LPCI refers to four LPCI pumps into two loops, two per loop.
4 ADS, 5 ADS, and 6 ADS means the number of ADS valves available for automatic activation.
Systems remaining, as identified in this table for recirculation suction line breaks, are applicable to other non-ECCS line breaks. For a LOCA from an ECCS line break, the systems remaining are those listed for recirculation suction breaks, less the ECCS in which the break is assumed.
§ SF-BATTlBX (X=A, B, or C) is the single failure of a Unit Battery that results in the loss of a downstream unitized 250V DC RMOV Board A, B, or C.
Unit 3 systems remaining. Conservative for Units 1 and 2.
A special case of ADS failure involves failure of initiation logic. However, 4 ADS valves are single failure proof, and will still function automatically.
BFN-26 Table 6.5-4 SEQUENCE OF EVENTS FOR LIMITING RECIRCULATION DISCHARGE LINE BREAK BATTERY FAILURE (SF-BATTlBA) (EXEM BWR-2000 LOCA METHODOLOGY)
Events Time (sec)
Initiate break 0.0 Initiate scram 0.6 Low-low liquid level, L2 (448 in) 40.1 Low-low-low liquid level, L1 (372.5 in) 65.7 Jet pump uncovers 95.6 Recirculation suction uncovers 155.9 Lower plenum flashes 182.1 LPCS high-pressure cutoff 280.9 LPCS valve pressure permissive 270.0 LPCS valve starts to open 272.0 LPCS valve fully open 305.0 LPCS permissive for ADS timer 94.7 LPCS pump at rated speed 97.7 LPCS flow starts 280.9 RDIV pressure permissive 312.5 RDIV starts to close 314.5 RDIV fully closed 350.5 Rated LPCS flow 374.5 ADS valves open 187.7 Blowdown ends 374.5 Bypass reflood 480.7 Core reflood 423.4 PCT 423.4
BFN-26 TABLE 6.5-5 DELETED BY AMENDMENT 25
BFN-26 Table 6.5-6 DELETED BY AMENDMENT 26
BFN-26 Table 6.5-7 DELETED BY AMENDMENT 25