ML21286A348

Amendment 29 to Updated Final Safety Analysis Report, Chapter 6, Table 6.5, Plant Parameters Used Locaa Analysis

ML21286A348
Person / Time
Site:	Browns Ferry
Issue date:	10/04/2021
From:	Tennessee Valley Authority
To:	Office of Nuclear Reactor Regulation
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Text

BFN-28

TABLE 6.5-1

PLANT PARAMETERS USED LOCA ANALYSIS

AREVA Analysis Plant Parameters Appendix K

Core Thermal Power (MWt) 4031 Corresponding Power 102% of 3952 MWt Vessel Steam Output (lbm/hr) 16.85 X 106 Rated Core Flow (lbm/hr) 102.5 X 106*

Vessel Steam Dome Pressure (psia) 1053 Maximum Recirculation Suction Line Break Area (ft2) 7.013 Maximum Recirculation Discharge Line Break Area (ft2) 7.013 Low Pressure Core Injection Valve Pressure Permissive for 335 Opening (psig)

Core Spray Injection Valve Pressure Permissive for 335 Opening (psig)

Recirculation Pump Discharge Valve Pressure Permissive 200 for Closure (psig)

Maximum delay time from EDG start signal until bus at 13 rated voltage (seconds)

BFN-28

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

• 5285 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)

• The FANP Analyses assume 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.

• • The 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.

• • • For core spray, the relaxed flow rate per loop is reduced by leakages associated with the 1/4-inch vent hole in the core spray T-joint (specified as 40 gpm) and repairs at the T-joint and the lower section replacement (specified as a total of 125 gpm). Flow rates are further reduced by 150 gpm to account for leakages associated with the Lower Sectional Hardware modification. This further reduction applies only to the configuration at Unit 3 and can be conservatively applied to Units 1 and 2.

BFN-26

TABLE 6.5-3

SINGLE FAILURE EVALUATION USED FOR LOCA ANALYSIS

Remaining Systems*,

Assumed Failure Recirculation Suction Recirculation Disposition Break Discharge Break Battery 6 ADS, 1 LPCS, 2 6 ADS, 1 LPCS Analyze SF-BATTlBA§ LPCI Battery 4 ADS**, HPCI, 1 4 ADS**, HPCI, 1 Analyze SF-BATTlBB§ LPCS, 2 LPCI LPCS Battery 4 ADS, HPCI, 1 LPCS, 4 ADS, HPCI, Bounded by SF-BATTlBB SF-BATTlBC§, 3 LPCI 1 LPCS, 1 LPCI SF-LOCA 6 ADS, HPCI, 1 LPCS, 6 ADS, HPCI, 1 Bounded by SF-BATTlBA (U1 & 2 only) 2 LPCI LPCS and SF-BATTlBB SF-LPCI 6 ADS, HPCI, 2 LPCS, 6 ADS, HPCI, 2 Bounded by SF-BATTlBA (Injection Valve) 2 LPCI LPCS and SF-BATTlBB SF-DGEN 6 ADS, HPCI, 1 LPCS, 6 ADS, HPCI, 1 Bounded by SF-BATTlBA (Diesel Generator) 2 LPCI LPCS and SF-BATTlBB SF-HPCI 6 ADS, 2 LPCS, 4 6 ADS, 2 LPCS, 2 Bounded by SF-BATTlBA LPCI LPCI SF-ADSlIL 4 ADS, HPCI, 2 4 ADS, HPCI, Bounded by SF-BATTlBB (Initiation Logic) LPCS,4 LPCI 2 LPCS, 2 LPCI SF-ADSlSV 5 ADS, HPCI, 2 LPCS, 5 ADS, HPCI, Bounded by SF-BATTlBB (Single Valve) 4 LPCI 2 LPCS, 2 LPCI

• 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.

• • A single failure of 250V RMOV Board B results in the loss of the normal power supply to ADS logic. Units 1, 2, and 3 are designed with an automatic transfer scheme for ADS logic power to provide four ADS valves for this board failure.

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-28 Table 6.5-4

SEQUENCE OF EVENTS FOR LIMITING RECIRCULATION DISCHARGE LINE BREAK BATTERY FAILURE (SF-BATTlBA) (EXEM BWR-2000 LOCA METHODOLOGY) (at 3952 MWt)

Events Time (sec)

Initiate break 0.0

Initiate scram 0.6

Low-low liquid level, L2 (448 in) 30.4

Low-low-low liquid level, L1 (372.5 in) 49.8

Jet pump uncovers 75.0

Recirculation suction uncovers 124.4

Lower plenum flashes 167.6

LPCS high-pressure cutoff 258.4

LPCS valve pressure permissive 248.0

LPCS valve starts to open 250.0

LPCS valve fully open 283.0

LPCS permissive for ADS timer 78.8

LPCS pump at rated speed 81.8

LPCS flow starts 258.4

RDIV pressure permissive 287.7

RDIV starts to close 289.7

RDIV fully closed 325.7

Rated LPCS flow 353.2

ADS valves open 171.8

Blowdown ends 353.2

Bypass reflood 486.9

Core reflood 423.1

PCT 423.1

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