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| number = ML15344A159
| number = ML15344A159
| issue date = 12/10/2015
| issue date = 12/10/2015
| title = Braidwood, Unit 1 - Submittal of Pressure and Temperature Limits Reports (Ptlrs), Revision 8 and Braidwood, Unit 2 - Pressure and Temperature Limits Reports (Ptlrs), Revision 7
| title = Submittal of Pressure and Temperature Limits Reports (Ptlrs), Revision 8 and Braidwood, Unit 2 - Pressure and Temperature Limits Reports (Ptlrs), Revision 7
| author name = Marchionda M
| author name = Marchionda M
| author affiliation = Exelon Generation Co, LLC
| author affiliation = Exelon Generation Co, LLC
Line 16: Line 16:


=Text=
=Text=
{{#Wiki_filter:}}
{{#Wiki_filter:Exelon Gonorotion Company, LLC Brmdwood Station Exelon Generation<                                                      35100 South Route 53, Suito 64 Bracovitlo, IL 60401*9619 December 10, 2015 BW150112 U.S. Nuclear Regulatory Commission ATIN: Document Control Desk Washington, DC 20555-0001 Braidwood Station, Units 1 and 2 Facility Operating License Nos. NPF-72 and NPF-77 NRC Docket Nos. STN 50-456 and 50-457
 
==Subject:==
Braidwood Unit 1 - Pressure and Temperature Limits Reports (PTLRs), Revision 8 Braidwood Unit 2 - Pressure and Temperature Limits Reports (PTLRs), Revision 7
 
==Reference:==
Letter from U.S. NRC to B.C. Hanson (Exelon Generation Company, LLC),
              "Issuance of Amendments to Utilize WCAP-16143-P, Revision 1, "Reactor Vessel Closure HeadNessel Flange Requirements Evaluation for Byron/Braidwood Units 1 and 2," dated October 16, 2014," dated October 28, 2015 The purpose of this letter is to transmit the Pressure and Temperature Limits Reports (PTLRs) for Braidwood Station, Units 1 and 2 in accordance with Technical Specification (TS) 5.6.6, "Reactor Coolant System (RCS) Pressure and Temperature Limits Report (PTLR)."
The Braidwood Unit 1 and Unit 2 PTLRs were revised to update the reference to WCAP-16143-P, "Reactor Vessel Closure HeadNessel Flange Requirements Evaluation for Byron/Braidwood Units 1 and 2," from Revision Oto Revision 1 for consistency with the referenced Technical Specification Amendment.
Please direct any questions you may have regarding this matter to Mr. Phillip Raush, Regulatory Assurance Manager, at (815) 417-2800.
Marri Ma hionda-Palmer Site Vice resident Braidwood Station Attachments: 1. Braidwood Unit 1 Pressure Temperature Limits Report (PTLR), Revision 8 2 Braidwood Unit 2 Pressure Temperature Limits Report (PTLR), Revision 7
 
ATTACHMENT 1 Braidwood Unit 1 Pressure and Temperature Limits Report (PTLR), Revision 8
 
BRAIDWOOD UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT (PTLR)
Revision 8
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table of Contents Section                                                                      Page l .O  Introduction 2.0  RCS Pressure and Temperature Limits                                    L 2.1  RCS Pressure and Temperature (Pff) Limits (LCO 3.4.3)            1 3.0  Low Temperature Over Pressure Protection and Boltup                    7 3.1  LTOP System Setpoints (LCO 3.4.12)                              7 3.2  LTOP Enable Temperature                                          7 3.3  Reactor Vessel Boltup Temperature (Non-Technical Specification)  7 4.0    Reactor Vessel Material Surveillance Program                          10 5.0  Supplemental Data Tables                                              12 6.0  References                                                            18
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT List of Figures Figure                                                                    Page 2.1  Braidwood Unit 1 Reactor Coolant System Heatup Limitations (Heatup  3 Rate of 100&deg;F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 2.2  Braidwood Unit 1 Reactor Coolant System Cooldown Limitations        4 (Cooldown Rates of 0, 25, 50, and l00&deg;F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors)
: 3. 1 Braidwood Unit 1 Nominal PORV Setpoints for the Low Temperature    8 Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) ii
 
BRAIDWOOD
* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT List of Tables Table                                                              Page 2.la Braidwood Unit l Heatup Data Points at 32 EFPY (Without        5 Margins for Instrumentation Errors) 2.lb Braidwood Unit 1 Cooldown Data Points at 32 EFPY (Without      6 Margins for Instrumentation Errors) 3.1  Data Points for Braidwood Unit l Nominal PORV Setpoints for    9 the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) 4.1  Braidwood Unit l Surveillance Capsule Withdrawal Summary      11 5.1  Braidwood Unit l Calculation of Chemistry Factors Using        13 Surveillance Capsule Data 5.2  Braidwood Unit 1 Reactor Vessel Material Properties            14 5.3  Summary of Braidwood Unit 1 Adjusted Reference Temperature    15 (ART) Values at 1/4T and 3/4T Locations for 32 EFPY 5.4  Braidwood Unit 1 Calculation of Adjusted Reference            16 Temperatures (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7016 5.5  RTPTs Calculation for Braidwood Unit 1 Beltline Region        17 Materials at EOL (32 EFPY) iii
 
BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 1.0 Introduction This Pressure and Temperature Limits Report (PTLR) for Braidwood Unit 1 has been prepared in accordance with the requirements of Braidwood Technical Specification (TS) 5.6.6, "Reactor Coolant System (RCS) Pressure and Temperature Limits Report (PTLR)".
Revisions to the PTLR shall be provided to the NRC after issuance.
The Technical Specifications (TS) addressed in this report are listed below:
LCO 3.4.3 RCS Pressure and Temperature (Pff) Limits; and LCO 3.4.12 Low Temperature Overpressure Protection (LTOP) System.
2.0 RCS Pressure and Temperature Limits The PTLR limits for Braidwood Unit l were developed using a methodology specified in the Technical Specifications. The methodology listed in WCAP-14040-NP-A, Revision 2 (Reference 1) was used with the following exceptions:
a) Optional use of ASME Code Section XI, Appendix G, Article G-2000, 1996 Addenda, b) Use of ASME Code Case N-640, ..Alternative Reference Fracture Toughness for Development of P-T Limit Curves, Section XI, Di vision I",
c) Use of ASME Code Case N-588, "Alternative to Reference Flaw Orientation of Appendix G for Circumferential Welds in Reactor Vessel, Section XI, Division l ",
and d) Elimination of the flange requirements documented in WCAP-16143-P.
These exceptions to the methodology in WCAP 14040-NP-A, Revision 2 have been reviewed and accepted by the NRC in References 2, 8, 9 and I 0.
WCAP 15364, Revision 2 (Reference 11), provides the basis for the Braidwood Unit l Pff curves, along with the best estimate chemical compositions, fluence projections and adjusted reference temperatures used to determine these limits. WCAP-16143-P, Reference 12, documents the technical basis for the elimination of the flange requirements.
2.1    RCS Pressure and Temperature (Pff) Limits (LCO 3.4.3) 2.1.1 The RCS temperature rate-of-change limits defined in WCAP-15364, Revision 2 (Reference 11) are:
a A maximum heatup of 100&deg;F in any 1-hour period,
: b. A maximum cooldown of 100&deg;F in any I-hour period, and
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT
: c. A maximum temperature change of less than or equal to l0&deg;F in any I-hour period during inservice hydrostatic and leak testing operations above the heatup and cooldown limit curves.
: 2. 1.2 The RCS Pff limits for heatup, inservice hydrostatic and leak testing, and criticality are specified by Figure 2.1 and Table 2. la. The RCS Pff limits for cooldown are shown in Figure 2.2 and Table 2. lb. These limits are defined in WCAP-15364, Revision 2 (Reference 11). Consistent with the methodology described in Reference 1 and exceptions noted in Section 2.0, the RCS Pff limits for heatup and cooldown shown in Figures 2.1 and 2.2 are provided without margins for instrument error. These limits were developed using ASME Boiler and Pressure Vessel Code Section XI, Appendix G, Article G2000, 1996 Addenda.
The criticality limit curve specifies pressure-temperature limits for core operation to provide additional margin during actual power production as specified in 10 CFR 50, Appendix G.
The Pff limits for core operation (except for low power physics testing) are that the reactor vessel must be at a temperature equal to or higher than the minimum temperature required for the inservice hydrostatic test, and at least 40&deg;F higher than the minimum pennissible temperature in the corresponding Pff curve for heatup and cooldown.
2
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT MATERIAL PROPERTY BASIS '
LIMITING MATERIAL: NO:ZZLE SHELL FORGING SP-7016 LIMITING ART VALUES AT 32 EFPY: l/4T, 48&deg;F 3/4T, 35&deg;F 2500 *.
r
                                                                ;Leak Test Limit I        OpeMlm Verslon:5.1 Run:29844 2250 .
j                                                    Acceptable 2000 .                                                                        Operation Unacceptable Operation          j j
          -us    1750 C!J c.
1500  *I- Heatup Rate 100 Deg. F/Hr I II~        L--"'
Critical Limit 100 Deg. F/Hr
                                            ~
Cl)
:::J fl) fl)                                )
            !    1250 ..
: c.                      ,_-!      ,./
            'ti
            !    1000
:::J u          .
          "i                                                  Crltlcallty Limit based on 0      750 .                                        lnaervlce hydrostatic test
                                              ~                temperature (1 OS'F) for the service period up to 32 EFPY 500 Boltup I~
Temp 250 .
0 ..
IThe lower llmlt for RCS 1 pressure lso psla
                                              ~
n 0      50      100    150      200        250      300    350    400          450        500 550 Moderator Temperature (Deg. F)
Figure 2.1 Braidwood Unit 1 Reactor Coolant System Heatup Limitations (Heatup Rate of 100&deg;F/hr)
Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 3
 
BRAIDWOOD
* UNIT I PRESSURE AND TEMPERATURE LIMITS REPORT MATERIAL PROPERTY BASIS LIMITING MATERIAL: N07ZLE FORGING SP-7016 LIMITING ART VALUES AT32 El-"PY: l/4T, 48&deg;F 3/4T, 35&deg;F 2500 IOper11m Versl0'1:5.1 Run:29844 I 2250 .
Unacceptable Operation Acceptable 2000  ~
Operation CJ 1750 .
ii5 a.
Q)
:J fl) 1500 .                  J fl) 1250 ..
Q)
: a.          .
                              /1 Cooldown Rates 1ca  1000 .
(&deg;F/Hr) steady.state,
      '3                          -25, u                          -50, and
      'ii                        -100 0      750 500 .
                  .                        I 250
                              -            I Boltup Temp. I 0              ~
IJ!he lower llmlt for RCS I
pressure la Opsla            I I
0      50      100        150      200    250  300  350 400        450          500      550 Moderator Temperature (Deg. F)
Figure 2.2 Braidwood Unit 1 Reactor Coolant System Cooldown Limitations (Cooldown Rates of 0, 25, 50 and 100&deg;F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 4
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.la Braidwood Unit 1 Heatup Data Points at 32 EFPY (Without Margins for Instrumentation Errors)
Heatup Curve 100 F Heatup        Criticality        Leak Test Limit              Limit T (&deg;F)    P <osie:) T(&deg;F)    P (osi2) T<&deg;F)    P (osi iz) 60      Note I    108      Note I  91      2000 60      1064      108        1114    108      2485 65      1114      I to      1166 70      1166      115        1172 75      1172      120        1176 80      1176      125        1188 85      1188      130        1207 90      1207      135        1234 95      1234      140        1267 100      1267      145        1308 105      1308      150        1357 110      1357      155        1414 115      1414      160        1479 120      1479      165        1554 125      1554      170        1638 130      1638      175        1732 135      1732      180        1838 140      1838      185        1956 145      1956      190        2088 150      2088      195        2235 155      2235      200      2397 160      2397 Note l :The Minimum acceptable pressure is 0 psi a
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.lb Braidwood Unit 1 Cooldown Data Points at 32 EFPY (Without Margins for Instrumentation Errors)
Cooldown Curves Sleady Stale  25 &deg;F Cooldown    50 &deg;F Cooldown  100 &deg;F Cooldown T (&deg;F)  P (psig) T(&deg;F)  P (psig)  T (&deg;F)  P (psig) T (&deg;F)  P (psig) 60      Note 1  60    Note I      60    Note I    60      Note I 60      1082    60      1078      60      l078*    60      1078*
65      1133    65      1133      65      1133    65      1133 70      1188    70      t 188      70      1188    70      1188 75      1250    75      1250      75      1250    75      1250 80      1318    80      1318      80      1318    80      1318 85      1393    85      1393      85      1393    85      1393 90      1476    90      1476      90      1476    90      1476 95      1568    95      1568      95      1568    95      1568 100      1669    JOO    1669      100      1669    JOO      1669 105      1781    105    1781      105      1781    105      1781 110      1905    110    1905      110      1905    110      1905 115      2042    115    2042      115    2042    115    2042 120      2194    120    2194      120    2194    120    2194 125      2361    125    2361      125    2361    125    2361
* Refer to Reference 13 Note 1:The Minimum acceptable pressure is 0 psia 6
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 3.0 Low Temperature Overpressure Protection and Boltup This section provides the Braidwood Unit 1 power opemted relief valve lift settings, low temperature overpressure protection (LTOP) system arming temperature, and minimum reactor vessel boltup temperature.
3.1    LTOP System Setpoints (LCO 3.4.12)
The power operated relief valves (PORVs) shall each have maximum lift settings in accordance with Figure 3.1 and Table 3. l. These limits are based on References 3 and 4.
The LTOP setpoints are based on Pff limits which were established in accordance with 10 CFR 50, Appendix G without allowance for instrumentation error and in accordance with the methodology described in Reference l. The LTOP PORV nominal lift settings shown in Figure 3.1 and Table 3. 1 account for appropriate instrument error.
3.2    LTOP Enable Temperature Braidwood Unit 1 procedures governing the heatup and cooldown of the RCS require the arming of the LTOP System for RCS temperature of 350&deg;F and below and disarming of LTOP for RCS temperature above 350&deg;F.
Note that the last LTOP PORV segment in Table 3.1 extends to 400&deg;F where the pressure setpoint is 2335 psig. This is intended to prohibit PORV lift for an inadvertent LTOP system arming at power.
3.3    Reactor Vessel Boltup Temperature (Non-Technical Specification)
The minimum boltup temperature for the Reactor Vessel Flange shall be~ 60&deg;F. Boltup is a condition in which the Reactor Vessel head is installed with tension applied to any stud, and with the RCS vented to atmosphere.
7
 
BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT I 2335ps1g 2250 2000                                                                                I
_ 1750                                                                                I S!
~
! 1500                                                                            I I
: a. 1250 Unacceplable Operation I
I IC 2
.. 1000
*ec
~
750 595 pslg PCV-456 i
I II I
500 541 pslg
                                                        " ' PCV-455A 0
0              mo        150          200        250        300      350 Auctlaneenid Low RCS Temperaluni (DEG. F)
Figure 3.1 Braidwood Unit 1 Nominal PORV Setpoints for the Low Temperature Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) 8
 
BRAIDWOOD-UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 3.1 Data Points for Braidwood Unit 1 Nominal PORV Setpoints for the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)
PCV-455A                                              PCV-456 (ITY-0413M)                                            (ITY-0413P)
AUCTIONEERED LOW      RCS PRESSURE                    AUCTIONEERED LOW      RCS PRESSURE RCS TEMP. (DEG. F)        (PSIG)                      RCS TEMP. (DEG. F)        (PSIG) 60                541                                60                  595 300                541                              300                  595 400                2335                              400                  2335 Note: To determine nominal lift setpoints for RCS Pressure and RCS Temperatures greater than 300&deg;F, linearly interpolate between the 300&deg;F and 400&deg;F data points shown above. (Setpoints extend to 400&deg;F to prevent PORV liftoff from an inadvertent LTOP system arming while at power.)
9
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 4.0 Reactor Vessel Material Surveillance Program The pressure vessel material surveillance program (Reference 5) is in compliance with Appendix H to 10 CFR 50, "Reactor Vessel Radiation Surveillance Program." The material test requirements and the acceptance standard utilize the reference nil-ductility temperature, RTNDT, which is determined in accordance with ASME Boiler and Pressure Vessel Code Section III, NB-2331. The empirical relationship between RTNoT and the fracture toughness of the reactor vessel steel is developed in accordance with Appendix G, "Protection Against Non-Ductile Failure," to Section XI of the ASME Boiler and Pressure Vessel Code. The surveillance capsule removal schedule meets the requirements of ASTM El85-82.
The third and final reactor vessel material irradiation surveillance specimens (Capsule W) have been removed and analyzed to determine changes in material properties. The surveillance capsule testing has been completed for the original operating period. The remaining three capsules, V, Y, and Z, were removed and placed in the spent fuel pool to avoid excessive fluence accumulation should they be needed to support life extension.
The removal summary is provided in Table 4.1.
10
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT
                                                  .Table 4.1 Braidwood Unit 1 Capsule Withdrawal Summary(*)
Capsule                                                                            Fluence Capsule                            Lead Factor            Withdrawal EFPY<b>
Location                                                                    (n/cm2, E>l.O MeV) u              58.5&deg;                4.02                          1.16                      0.388 x 10 19 x            238.5&deg;                4.06                          4.30                        1.17 x 10 19 w            121.5&deg;                4.05                          7.79                        l.98 x 1019 z<c) 301.5&deg;                4.09                  12.01 (EOC 10)                    2.79 x 10 19 y(c) 61.0&deg;                3.92                  17.69 (EOC 14)                    3.71 x 10 19 y<c) 241.0&deg;                3.81                  12.01 (EOC 10)                    2.60 x 1019 Notes:
(a)  Source document is CN-AMLRS-I0-7 (Reference 14), Table 5.7-3.
(b)  Effective Full Power Years (EFPY) from plant startup.
(c)  Standby Capsules Z, V, and Y were removed and placed in the spent fuel pool. No testing or analysis has been performed on these capsules. If license renewal is sought, one of these standby capsules may nt!ed to be tested to determine the effect of neutron irradiation on the reactor vessel surveillance materials during the period of ex1ended operation.
ll
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 5.0 Supplemental Data Tables The foJlowing tables provide supplemental information on reactor vessel material properties and are provided to be consistent with Generic Letter 96-03. Some of the material property values shown were used as inputs to the Pff limits.
Table 5.1 shows the calculation of the surveillance material chemistry factors using surveillance capsule data.
Table 5.2 provides the reactor vessel material properties table.
Table 5.3 provides a summary of the Braidwood Unit I adjusted reference temperature (ART) values at the l/4T and 3/4T locations for 32 EFPY.
Table 5.4 shows the calculation of ARTs at 32 EFPY for the limiting Braidwood Unit I reactor vessel material, i.e. weld WF-562 ( HT # 442011, Based on Surveillance Capsules U and X Data).
Table 5.5 provides the RTns calculation for Braidwood Unit 1 Beltline Region Materials at EOL (32 EFPY), (Reference 7).
12
 
BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.1 Braidwood Unit 1 Calculation of Chemistry Factors Using Surveillance Capsule Data<11 >
Capsule f<bl                .1.RTNllTlbl FP.1.RTNDT Material            Capsule                                    FF<c1                                FF2 (n/cm2, E > 1.0 MeV)                    (oF)          (oF) u                    0.388 x 1019      0.738        5.78          4.26      0.54 Lower Shell Forging                x                    1.17 x 10 19 1.044        38.23        39.91      1.09 (Tangential) w                    1.98 x 1019      1.186        24.14        28.64      1.41 u                    0.388 x 10  19 0.738        o.01d1        0.00      0.54 Lower Shell Forging                x                    1.17 x 10 19 1.044        28.75        30.01      1.09 (Axial) w                    1.98 x 1019      1.186        37. 11        44.03      1.41 SUM:      146.85    6.08 CF LSForJini    =L(FF *.1.RTNoT) + L(FF2) =(146.85) + (6.08) =24.1&deg;F u                    0.388 x 1019      0.738        17.06          12.59    0.54 Braidwood Unit 1 Surveillance Weld            x                    1.17 x 1019      1.044        30.15        31.47      1.09 Material w                    1.98 x 10 19 1.186        49.68        58.94      1.41 Braidwood Unit 2 u                    0.388 x 1019      0.738        o.o<d>        0.00      0.54 Surveillance Weld            x                    1.15 x 10 19 1.039        26.3        27.33      1.08 Material w                    2.07 x 10 19 1.198        23.9        28.63      1.44 SUM:      158.96      6.10 CF Wckll'.lcw    =L(FF "'ARTNoT) + L(FF ) =(158.96) + (6.10) =26.l&deg;F 2
~:
(a)    Source document is CN-AMLRS-10-7 (Reference 14), Table 5.2-1.
(b)    f = fluence; .1.RTNOT values are the measured 30 ft-lb shift values taken from Reference 6.
(c)        =
FF fluence factor  =r  0*28
* o.io*1og I)
(d)    Measured ARTNm values were determined to be negative, but physically a reduction should not occur; therefore, conservative values of zero are used.
IJ
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.2
                        .Braidwood Unit 1 Reactor Vessel Material Properties Chemistry            Initial Material Description                Cu(%)          Ni(%)
Factor      RT NOT {&deg;F)(a)
Closure Head Flange Heat# 5P738 l/3P6406 0.1 l        0.67              --              -20 Vessel Flange Heat # 122N357V                        --          0.77              --              -10 Nozzle Shell Forging
* 26.0&deg;Pb>
0.04          0.73                              10 Heat# 5P-7016 Intermediate Shell Forging
* 0.05          0.73        3 l .0&deg;Pb>          -30 Heat # [49D383/49C344)-1-1 0
Lower Shell Forging
* 31.0&deg;F '
0.05          0.74        24.l ope>            -20 Heat# [49D867/49C813]-l-l Circumferential Weld*                                              4l.0&deg;Pb>
(Intermediate Shell to Lower Shell)          0.03          0.67        26.1 ope>            40 WF-562 (HT# 442011)
Upper Circumferential Weld*
(Nozzle Shell to Intermediate Shell)        0.04          0.46        54.oopbl            -25 WF-645 (HT# H4498)
* Beltline Region Materials a) The Initial RTNoTvalues for the plates and welds are based on measured data.
b) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 1.1.
c) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 2.1.
14
 
BRAIDWOOD
* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT
                                              .Table 5.3 Summary of Braidwood Unit 1 Adjusted Reference Temperature (ART) Values at l/4T and 3/4T Locations for 32 EFPv1*>
32 EFPY Surface Flucncc Reactor Vcssel Material                                              1/4TART            3/4TART (n/cm2, E>l.O McV)
(OF)              (oF)
Nozzle Shell Forging                        0.586 lt 1019              47                34 19 Intermediate Shell Forging                      1.76 x 10                33                15 Lower Shell Forging                          1.76 x 10 19              43                25
-.Using credible surveillance data                  1.76 x 10 19              21                15 Nozzle to Intermediate Shell Forging Circ. Weld Seam                          0 .586x 1019              52                25 (Heat # H4498)
Intermediate to Lower Shell Forging Circ. Weld Seam                            1.70 x 10 19              122                99 (Heat# 442011)
-Using credible surveillance data                  1.70 x 1019              93                78
~:
(a)  The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14),
Tables 5.3. 1-1 and 5.3.1-2. The ART values summarized in this table utilize the most recent fluence projections and materials data, but were not used in development of the Pff limit curves. See Figures 2.1 and 2.2 of this PTLR for the ART values used in development of the Pff limit curves.
15
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT
                                      .Table 5.4 Braidwood Unit 1 Calculation of Adjusted Reference Temperatures (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7016 Parameter                                      Values Operating Time                                    32 EFPY Locationtai                  l/4T ART(&deg;F)                3/4T ART(&deg;F)
Chemistry Factor, CF (&deg;F)                    26.0                        26.0 Fluence(t), n/cml 3.65 x 1018                  l.32 xl0 18 (E> 1.0 Mev)<b>
Fluence Factor, FF                      0.772                      0.475 i1RTNor= CFxFF(&deg;F)                        18.8                        12.4 Initial RT Nor.* 1(&deg;F)                    10                          10 Margin, M (&deg;F)                          18.8                        12.4 ART= I+(CF*FF)+M,&deg;F 48                          35 per RG 1.99, Revision 2 (a) The Braidwood Unit I reactor vessel wall thickness is 8.5 inches at the beltline region.
(b) Flucnce r, is based upon f,wf (E > 1.0 Mev) = 6.08 x 1018 at 32 EFPY (Reference 11).
l6
 
BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.5 RTPTS Calculation for Braidwood Unit 1 Beltline Region Materials at EOL (32 EFPYi*,h>
(c R.G.1.99,                                                IRTNDT                    Cfu<c>  CfJ.(d) Margin CF            Fluence                            I      .ARTNDT                              RTFrS Reactor Vessel Material              Rev.2      (oF)    (n/cm2, E>l.O MeV)
FF (oF)      (Of)    {of)      (oF)  (Of)
Position                                                  (OF)
Nozzle Shell Forging                  1.1        26        0.586 x 1019          0.8504        10        22. l        0    l l.l      22.l  54 Intennediate Shell Forging              l.l        31        1.76 x 10 19        1.1554        -30        35.8        0      17        34    40 Lower Shell Forging                  1.1        31        1.76 x 1019          1.1554        -20        35.8        0      17        34    50
-+Using credible surveillance data          2.1        24.l        l.76x 1019          l.l554        -20        27.8        0      8.5        17    25 Nozzle to Intermediate Shell Forging Circ. Weld Seam                  I.I        54        0.586x 10 19          0.8504        -25        45.9        0    23.0      45.9    67 (Heat # H4498)
Intermediate to Lower Shell Forging Circ. Weld Seam                  I.I        41        1.70 x 1019          1.1461        40        47.0        0    23.5      47.0    134 (Heat# 442011)
-+Using credible surveillance data          2. 1      26.l        1.70 x 1019          1.1461        40        29.9        0      14        28    98 Notes:
(a) The 10 CFR 50.61 methodology was uti.lized in the calculation of the RTPTS values.
(b) The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14), Table 5.5-l.
(c) Initial RTNDT values are based on measured data. Hence, Gu= 0&deg;F.
                                                            =
(d) Per the guidance of 10 CFR 50.61, the base metal a11 l 7&deg;F for Position 1.1 (without surveillance data) and with credible surveillance data a4 = 8.5&deg;F for Position 2.1; the weld metal a 4 =28&deg;F for Position I.I (without surveillance data) and with credible surveillance data cr4 =
14&deg;F for Position 2.1. However, cr4 need not exceed 0.5*.6.RTNDT*
17
 
BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 6.0    References
: 1. WCAP-14040-NP-A, Revision 2, "Methodology Used to Develop Cold Overpressure Mitigating System Setpoints and RCS Heatup and Cooldown Limit Curves," J.D. Andrachek, et al., January 1996.
: 2. NRC Letter from R. A. Capra to O.D. Kingsley, Commonwealth Edison Company, "Byron Station Units 1 and 2 and Braidwood Station Units 1 and 2, Acceptance for referring of pressure temperature limits report, (M98799, M98800, M98801, and M98802)," January 21 1998.
: 3. Westinghouse Letter to Exelon Nuclear, CAE-10-MUR-197, Revision 0, "Low Temperature Overpressure Protection (LTOP) System Evaluation Final Letter Report," M.P. Rudakewiz, September 8, 2010.
: 4. Byron & Braidwood Design Information Transmittal DIT-BRW-2006-0051, "Transmittal of Braidwood Unit 1 and Unit 2 Temperature and Pressure Uncertainties for Low Temperature Overpressure System (LTOPS) Power Operated Relief Valves (PORVS)," Nathan (Joe)
Wolff Jr., July 18, 2006.
: 5. WCAP-9807, "Commonwealth Edison Company, Braidwood Station Unit 1 Reactor Vessel Radiation Surveillance Program," S.E. Yanichko, et al., February 1981.
: 6. WCAP-15316, Revision l, "Analysis of Capsule W from Commonwealth Edison Company Braidwood Unit l Reactor Vessel Radiation Surveillance Program," E. Terek, et al.,
December 1999.
: 7. WCAP-15365, Revision l, "Evaluation of Pressurized Thermal Shock for Braidwood Unit l," J.H. Ledger, January 2002.
: 8. NRC Letter from G. F. Dick, Jr., NRR, to C. Crane, Exelon Generation Company, LLC, "Issuance of Amendments: Revised Pressure-Temperature Limits Methodology; Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2," dated October 4, 2004.
: 9. NRC Letter from M. Chawla to O.D. Kingsley, Exelon Generation Company, LLC, "Issuance of exemption from the Requirements of 10 CFR 50 Part 60 and Appendix G for Byron Station, Units l and 2, and Braidwood Stations, Units 1 and 2," dated August 8, 200 l .
: 10. NRC Letter from R. F. Kuntz, NRR, to C. M. Crane, Exelon Generation Company, LLC, "Byron Station, Unit Nos. 1 and 2, and Braidwood Station, Unit Nos. 1 and 2- Issuance of Amendments Re: Reactor Coolant System Pressure and Temperature Limits Report (TAC Nos. MC8693, MC8694, MC8695, and MC8696)," November 27, 2006.
18
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT
: 11. WCAP-15364, Revision 2, "Braidwood Unit 1 Heatup and Cooldown Limit Curves for Normal Operation," T.J. Laubham, November 2003.
: 12. WCAP-16143-P, Revision I, "Reactor Vessel Closure Head/Vessel Flange Requirements Evaluation for Byron/Braidwood Units I and 2," W. Bamford, et al., October 2014.
: 13. Westinghouse Letter to Exelon Nuclear, CCE-07-24, "Braidwood Unit I and 2 RCS HU/CD Limit Curve Table Values," dated February 15, 2007.
: 14. Westinghouse Calculation Note CN-AMLRS-10-7, Revision 0, "Braidwood Units 1 and:?
Measurement Uncc11ainty Recapture (MUR) Uprate: Reactor Vessel Integrity Evaluations,"
A.E. Leicht. September 2010.
19
 
ATTACHMENT 2 Braidwood Unit 2 Pressure and Temperature Limits Report (PTLR), Revision 7
 
BRAIDWOOD UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT (PTLR)
Revision 7
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table of Contents Section                                                                      Page 1.0  Introduction                                                            1 2.0  RCS Pressure Temperature Limits 2.1  RCS Pressure and Temperature (P/f) Limits (LCO 3.4.3) 3.0    Low Temperature Over Pressure Protection and Boltup                      7 3.1  LTOP System Setpoints (LCO 3.4.12)                                7 3.2  LTOP Enable Temperature                                            7 3.3  Reactor Vessel Boltup Temperature (Non-Technical Specification)    7 4.0    Reactor Vessel Material Surveillance Program                            10 5.0    Supplemental Data Tables                                                12 6.0    References                                                              18
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATORE LIMITS REPORT List of Figures Figure                                                                        Page 2.1 Braidwood Unit 2 Reactor Coolant System Heatup Limitations              3 (Heatup Rate of l 00&deg;F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 2.2 Braidwood Unit 2 Reactor Coolant System Cooldown Limitations            4 (Cooldown Rates of 0, 25, 50 and 100&deg;F/hr) Applicable to 32 EFPY (Without Margins for Instrumentation Errors) 3.1  Braidwood Unit 2 Nominal PORV Setpoints for the Low Temperature        8 Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)
 
BRAIDWOOD .. UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT List of Tables Table                                                          Page
: 2. la Braidwood Unit 2 Heatup Data at 32 EFPY (Without          5 Margins for Instrumentation Errors)
: 2. lb Braidwood Unit 2 Cooldown Data Points 32 EFPY (Without    6 Margins for lnstrumentation Errors)
: 3. l Data Points for Braidwood Unit 2 Nominal PORV            9 Setpoints for the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)
: 4. 1  Braidwood Unit 2 Capsule Withdrawal Summary              11 5.1  Braidwood Unit 2 Calculation of Chemistry Factors Using  13 Surveillance Capsule Data 5.2  Braidwood Unit 2 Reactor Vessel Material Properties      14 5.3  Summary of Braidwood Unit 2 Adjusted Reference          15 Temperature (ART) Values at l/4T and 3/4T Locations for 32 EFPY 5.4  Braidwood Unit 2 Calculation of Adjusted Reference      16 Temperature (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7056 5.5  RTPTS Calculation for Braidwood Unit 2 Beltline Region  17 Materials at EOL (32 EFPY)
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 1.0    Introduction This Pressure and Temperature Limits Report (PTLR) for Braidwood Unit 2 has been prepared in accordance with the requirements of Braidwood Technical Specification (TS) 5.6.6, "Reactor Coolant System (RCS) Pressure and Temperature Limits Report (PTLR)". Revisions to the PTLR shall be provided to the NRC after issuance.
The Technical Specifications addressed in this report are listed below:
LCO 3.4.3 RCS Pressure and Temperature (Pff) Limits; and LCO 3.4.12 Low Temperature Overpressure Protection (LTOP) System.
2.0    RCS Pressure Temperature Limits The PTLR limits for Braidwood Unit 2 were developed using a methodology specified in the Technical Specifications. The methodology listed in WCAP-14040-NP-A, Revision 2 (Reference I) was used with the following exception:
a) Optional use of ASME Code Section XI, Appendix G, Article G-2000, 1996 Addenda, b) Use of ASME Code Case N-640, "Alternative Reference Fracture Toughness for Development of P-T Limit Curves, Section XI, Division l", and c) Use of ASME Code Case N-588, "Alternative to Reference Flaw Orientation of Appendix G for Circumferential Welds in Reactor Vessel, Section XI, Division 1", and d) Elimination of the flange requirements documented in WCAP-16143-P.
This exception to the methodology in WCAP 14040-NP-A, Revision 2 has been reviewed and accepted by the NRC in References 2, 7, 9, and 10.
WCAP 15373, Revision 2 (Reference 11), provides the basis for the Braidwood Unit 2 Pff curves, along with the best estimate chemical compositions, fluence projections and adjusted reference temperatures used to detennine these limits.
WCAP-16143-P, Reference 12, documents the technical basis for the elimination of the flange requirements.
2.1    RCS Pressure and Temperature (Pff) Limits (LCO 3.4.3) 2.1. l The RCS temperature rate-of-change limits defined in Reference 11 are:
: a. A maximum heatup of 100&deg;F in any I-hour period.
: b. A maximum cooldown of 100&deg;F in any I-hour period, and 1
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT                          .
: c. A maximum temperature change of less than or equal to l0&deg;F in any I-hour period during inservice hydrostatic and leak testing operations above the heatup and cooldown limit curves.
2.1.2 The RCS Pff limiL'i for heatup, inservice hydrostatic and leak testing, and criticality are specified by Figure 2.1 and Table 2.1 a. The RCS Pff limits for cooldown are shown in Figure 2.2 and Table 2.1 b. These limits are defined in WCAP-15373, Revision 2 (Reference 11). Consistent with the methodology described in Reference l, with the exception noted in Section 2.0, the RCS Pff limits for heatup and cooldown shown in Figures 2.1 and 2.2 are provided without margins for instrument error. These limits were developed using ASME Boiler and Pressure Vessel Code Section XI, Appendix G, Article G2000, 1996 Addenda. The criticality limit curve specifies pressure-temperature limits for core operation to provide additional margin during actual power production as specified in LO CFR 50, Appendix G.
The Pff limits for core operation (except for low power physics testing) are that the reactor vessel must be at a temperature equal to or higher than the minimum temperature required for the inservice hydrostatic test, and at least 40&deg;F higher than the minimum permissible temperature in the corresponding Pff curve for heatup and cooldown.
2
 
BRAIDWOOD* UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Material Proocrty Basis Limiting Material: Circumferential Weld WF-562 & Nozzle Shell Forging Limiting ART Values at 32 EFPY l/4T 93&deg;F (N-588) & 67&deg;F ('96 App. G) 3/4T 79&deg;F (N-588) & 54&deg;F ('96 App. G) 2500 *.
2250
                                                      ,'    Leak Test Limit IOper1im Verslon:5.1 Aun: 19017
              .                    j                                                      Acceptable 2000                                                                              Operation Unacceptable
              *-        Operation              J
-      1750 I      )
CJ Ci)
-...          --.. . . . . IJ tI CL      1500 .
CD 1DO Deg. F/Hr                        r- Crltlcal  Limit 100 Deg. F/Hr
  ~
1250 .
U)
U)
CL
  ...CD      .
_V ~
"Cl CD    1000 .            ,..-        ...
  ~
u ca      750 Crltlcallty Limit b ased on lnservlca hydrostatic test 0                                        -
                                          ,                  temperature (127"F) for the service period up to 32 EFPY 500 .
Boltup Temp 250
                                                !The lower llmlt for RCS 0              ,_          .....-                o 1presaura Is psla 0        50      100        150        200        250      300        350 400        450        500        550 Moderator Temperature (Deg. F)
Figure 2.1 Braidwood Unit 2 Reactor Coolant System Heatup Limitations (Heatup Rate of 100&deg;F/hr)
Applicable to 32 EFPY (Without Margins for Instrumentation Errors) 3
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Material Property Basis Limiting Malerial: Circumferential Weld WF-562 & Nozzle Shell Forging Limiting ART Values at 32 EFPY 1/4T 93&deg;F (N-588) & 67&deg;F ('96 App. G) 3/4T 79&deg;F (N-588) & 54&deg;F ('96 App. G) 2500 Oper11m Version:5.1 Run:19017 I f
2250    -
                . Unacceptable Operation Acceptable 2000                                                                      Operation
-      1750                            J CJ Ci5 a.
u    1500  -                    I
  ~
  ,,,en                          J I
  !    1250    -
                          ,Ii a.
"C u
m 1000
  ~
u
'ii Cooldown Rates
(&deg;F/Hr) steady-state,
                                  *25, 0                                *50, and 750                      *100 500 I
250 I
Boltup Temp.      I LJ;rh* lower limit for RCS I
0 -          -    -
I pressure lso psla I
0      50      100        150    200      250    300    350 400      450        500      550 Moderator Temperature (Deg. F)
Figure 2.2 Braidwood Unit 2 Reactor Coolant System Cooldown Limitations (Cooldown Rates of O, 25, 50 and 100&deg;F/hr) Applicable to 32 EFPY (Without Margins of Instrumentation Errors) 4
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.la Braidwood Unit 2 Heatup Data Points at 32 EFPY (Without Margins for Instrumentation Errors)
Heatup Curve 100 F Heatup      Criticality Limit    Leak Test Limit T (&deg;F)    P (psig)  T (&deg;F)      P (psig) T ("F)    P (psig) 60      Note I    127        Note I    110      2000 60        924      127          965    127      2485 65        965      127        977*
70        977      127          977 75          977      127          981 80        977      130          990 85        981      135        1005 90        990      140        1025 95        1005      145        1051 100        1025      150        1081 105        1051      155        1118 110        1081      160        1161 115        1118      165        1210 120        1161      170        1266 125        1210      175        1329 130        1266      180        1400 135      1329      185        1480 140        1400      190        1569 145      1480      195        1668 150        1569      200        1778 155      1668      205        1901 160      1778      210        2036 165        1901      215        2186 170      2036      220        2353 175      2186 180      2353
* Refer to Reference  l3 Note 1:      The Minimum acceptable pressure is 0 psia 5
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.lb Braidwood Unit 2 Cooldown Data at 32 EFPY (Without Margins for Instrumentation Errors)
Cooldown Curves Steady State    25 &deg;F Cooldown    50 &deg;F Cooldown  I00 &deg;F Cooldown T ("F)    P (psig) T (&deg;F) P (psig)  T (&deg;F) P (psig)  T (&deg;F)    P (psig) 60      Note I    60      Note I      60    Note I  60      Note 1 60        931    60        908      60      889    60        866 65        965    65        946      65      932    65        921 70        1003    70        989      70      980    70        980 75        1045    75      1036      75      1033    75      1033 80      1092    80      1088      80      l088    80      1088 85      1143    85      1143      85      1143    85      1143 90        1200    90      1200      90      1200    90      1200 95        1263    95      1263      95      1263    95      1263 100      1332    100      1332      too      1332    100      1332
        !05      1409    !05      1409      l05      1409    105      1409 110      1494    110      1494      110      1494    110      1494 115      1587    115      1587      115      1587    115      1587 120      1691    120      1691      120      1691    120      1691 125      1805    125      1805      125      1805    125      1805 130      1932    130      1932      130      1932    130      1932 135      2071    135      2071      135      2071    135      2071 140      2226    140      2226      140      2226    140      2226 145      2396    145      2396      145      2396    145      2396 Note 1:    The Minimum acceptable pressure is 0 psia 6
 
BRAIDWOOD~ UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 3.0 Low Temperature Overpressure Protection and Boltup This section provides the Braidwood Unit 2 power operated relief valve lift settings, low temperature overpressure protection (LTOP) system arming temperature, and minimum reactor vessel boltup tempemture.
3.1    LTOP System Setpoints (LCO 3.4.12).
The power operated relief valves (PORVs) shall each have nominal lift settings in accordance with Figure 3.1 and Table 3.1. These limits are based on References 3 and 8.
The LTOP setpoints are based on Pff limits that were established in accordance with IO CFR 50, Appendix G without allowance for instrumentation error. The LTOP setpoints were developed using the methodology described in Reference
: 1. The LTOP PORV nominal lift settings shown in Figure 3.1 and Table 3.1 account for appropriate instrument error.
3.2    LTOP Enable Temperature Braidwood Unit 2 procedures governing the heatup and cooldown of the RCS require the arming of the LTOP System for RCS temperature of 350&deg;F and below and disarming of LTOP for RCS temperature above 350&deg;F.
Note that the last LTOP PORV segment in Table 3.1 extends to 400&deg;F where the pressure setpoint is 2335 psig. This is intended to prohibit PORV lift for an inadvertent LTOP system arming at power.
3.3    Reactor Vessel Boltup Temperature (Non-Technical Specification)
The minimum boltup temperature for the Reactor Vessel Flange shall be~ 60&deg;F.
Boltup is a condition in which the Reactor Vessel head is installed with tension applied to any stud, and with the RCS vented to atmosphere.
7
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 2500 I i33Spslg 2250 2000 I
m;o                                                                              I 8
ill Q.
i  tiSOO I
i Q.
1250 Unocceplable Operation I
a:
0 Q.
l  1000 I
*e
~
639 psig PCV456
                                      !                                  I I
599pelg                                  '\.
                                                            " PCV455A 0
0                100      150          200          250      300      350    400 Auctlon. .red Low RCS Temp1mure IDEG. F)
Figure 3.1 Braidwood Unit 2 Nominal PORV Setpoints for the Low Temperature Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) 8
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 3.1 Data Points for Braidwood Unit 2 Nominal PORV Setpoints for the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)
PCV-455A                                            PCV-456 RCS TEMP.          RCS Pressure                    RCS TEMP.      RCS Pressure (DEG. F)              (PSIG)                        (DEG. F)        (PSIG) 60                  599                            60              639 300                  599                          300              639 400                2335                          400            2335 Note: To determine nominal lift setpoints for RCS Pressure and RCS Temperatures greater than 300&deg;F, linearly interpolate between the 300&deg;F and 400&deg;F data points shown above. (Setpoints extend to 400&deg;F to prevent PORV liftoff from an inadvertent LTOP system arming while at power).
9
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 4.0 Reactor Vessel Material Surveillance Program The pressure vessel material surveillance program (Reference 4) is in compliance with Appendix H to 10 CFR 50, "Reactor Vessel Radiation Surveillance Program." The material test requirements and the acceptance standards utilize the reference nil-ductility temperature, RTNOT, which is determined in accordance with ASME Boiler and Pressure Vessel Code, Section III, NB-2331.
The empirical relationship between RT NOT and the fracture toughness of the reactor vessel steel is developed in accordance with Appendix G, "Protection Against Non-Ductile Failure," to Section XI of the ASME Boiler and Pressure Vessel Code. The surveillance capsule removal schedule meets the requirements of ASTM E 185-82.
The third and final reactor vessel material irradiation surveillance specimens (Capsule W) have been removed and analyzed to determine changes in material properties. The surveillance capsule testing has been completed for the original operating period. The remaining three capsules, V, Y, and Z, were removed and placed in the spent fuel pool to avoid excessive fluence accumulation should they be needed to support life extension. The removal summary is provided in Table4.1.
IO
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 4.1 Braidwood Unit 2 Capsule Withdrawal Summary'0 >
Capsule                                                                  Fluence Capsule                    Lead Factor        Withdrawal EFPY<">
Location                                                          (n/cm2,  E>l.O MeV) u          58.5&deg;              4.08                      l.18                  0 .388 x 10 19 x          238.5&deg;              4.03                    4.24                      1.15 x 10 19 w          121.5&deg;              4.06                    8.56                    2.07 x 1019 zCc) 301.5&deg;              4.14              12.78 (EOC 10)                  2.83 x 10 19 y(c) 61.0&deg;              3.92              18.42 (EOC 14)                  3.73 x 1019 y<c>        241 .0&deg;            3.89              12.78 (EOC 10)                  2.66 x 1019 Notes:
(a)  Source document is CN-AMLRS-10-7 (Reference 14), Table 5.7-4.
(b)  Effective Full Power Years (EFPY) from plant startup.
(c)  Standby Capsules Z, V, and Y were removed and placed in the spent fuel pool. No testing or analysis has been performed on these capsules. If license renewal is sought, one of these standby capsules may need to be tested to detennine the effect of neulron irradiation on the reactor vessel surveillance materials during the period of extended operation.
11
 
BRAIDWOOD* UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 5.0 Supplemental Data Tables The following tables provide supplemental information on reactor vessel material properties and are provided to be consistent with Generic Letter 96-03.
Some of the material property values shown were used as inputs to the Pff limits.
Table 5.1 shows the calculation of the surveillance material chemistry factors using surveillance capsule data.
Table 5.2 provides the reactor vessel material properties table.
Table 5.3 provides a summary of the Braidwood Unit 2 adjusted reference temperature (ART) values at the l/4T and 3/4T locations for 32 EFPY.
Table 5.4 shows the calculation of ARTs at 32 EFPY for the limiting Braidwood Unit 2 reactor vessel material.
Table 5.5 provides the RTPTS Calculation for Braidwood Unit 2 Beltline Region Materials at EOL (32 EFPY), (Reference 6).
12
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.1 Braidwood Unit 2 Calculation of Chemistry Factors Using Surveillance Capsule Data<0 >
Capsule rb1                ARTNDT(b)      FF*ARTNDT Material          Capsule                                FF<cl                                FF2 (n/cm1, E > 1.0 MeV)                  (oF)          (oF)
Lower Shell u                0.388 x 1019      0.738      o.o<d1          0.00      0.54 Forging              x                  1.15 x 1019      1.039      o.o<d>          0.00      1.08 (Tangential) w                2.07 x 10  19 1.198        4.53          5.43      1.44 u                0.388 x 1019      0.738      o.o<d1          0.00      0.54 Lower Shell Forging              x                  1.15 x rn 19 1.039      33.94          35.26      1.08 (Axial) w                2.07 x 1019      1.198        33.2          39.78      1.44 SUM:        80.47      6.12 CF LS Forging= L(FF *ARTNO'T) +  :E(FF2) = (80.47) + (6.12) = 13.2&deg;F Braidwood Unit I u                0.388 x rn 19      0.738      17.06          12.59      0.54 Surveillance Weld          x                  1.17 x 10 19 1.044      30.15          31.47      1.09 Material w                  1.98 x 1019      1.186      49.68          58.94      1.41 Braidwood Unit 2 u                0.388 x 10  19 0.738      o.o<d>          0.00      0.54 Surveillance Weld          x                1.15 x 10  19 1.039        26.3          27.33      1.08 Material w                2.07 x 10  19 1.198        23.9          28.63      1.44 SUM:        158.96      6.10 CF Weld Mew= L(FF *ARTNor)+ L(FF2) = (158.96) + (6.IO) = 26.PF Notes:
(a)    Source document is CN-AMLRS-10-7 (Reference 14), Table 5.2-2.
(b)    f= fluence; ARTNDT values are the measured 30 ft-lb shift values taken from Reference 5.
(c)    FF= fluence faclor =(0*28
* o.io*ioa 0 (d)    Measured ARTNDT values were determined to be negative, but physically a reduction should not occur; therefore, conservative values of zero are used.
13
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.2 Braidwood Unit 2 Reactor Vessel Material Properties Chemistry            Initial Material Description                  Cu(%)        Ni(%)                      RT NDT (&deg;F)(o)
Factor Closure Head Flange Heat# 3P6566/5P7547/4P6986                      --          0.75            --                20 Serial# 2031-V-1 Vessel Flange Heat # 124P455 0.07          0.70            --                20 Nozzle Shell Forging
* 26.0&deg;Fbl 0.04          0.90                              30 Heat # SP-7056 lntennediate Shell Forging
* 20.0&deg;Fb)
Heat # [49D963/49C904] 1                  0.03          0.71                            -30 0
Lower Shell Forging
* 37.0&deg;F '
0.06          0.76        13.2&deg;Fc)            -30 Heat# [500102/50C97]-l-l Circumferential Weld *
(Intermediate Shell to Lower Shell)                                    41.opb>
Weld Seam WF-562                        0.03          0.67        26.lFc>              40 Heat# 442011 Circumferential Weld*
(Nozzle Shell to Intermediate Shell) 0.04          0.46        54.0&deg;phl            -25 Weld Seam WF-645 Heat#H4498
* Beltline Region Materials a) The Initial RTNOT values for the plates and welds are based on measured data.
b) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 1.1.
c) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 2.1 14
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT
                                                  .Table 5.3 Summary of Braidwood Unit 2 Adjusted Reference Temperature (ART) Values at l/4T and 3/4T Locations for 32 EFPv**>
Surface Fluence                      32EFPY Reactor Vessel Material (n/crn 2, E>l.O MeV)      l/4T ART (&deg;F)      3/4T ART (&deg;F) 19 Nozzle Shell Forging                        0 .559 x 10                66                    54 19 Intermediate Shell Forging                      1.73 x 10                  JO                  -I 19 Lower Shell Forging                        1.73 x 10                41                    24
-+Using non-credible surveillance data                1.73 x 10 19              -3                  -1 l Nozzle lo Intermediate Shell Forging Circ. Weld Seam                          0.559x 1019                51                    24 (Heat # H4498)
Intermediate to Lower Shell Forging Circ. Weld Seam                          1.67 x 1019              122                  99 (Heat# 442011)
  -+Using credible surveillance data                  1.67 x 10 19              92                  78 Notes:
(a)  The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14),
Tables 5.3.1-3 and 5.3. 1-4. The ART values summarized in this table utilize the most recent lluence projections and materials data, but were not used in development of the Prr limit curves.
See Figures 2.1 and 2.2 of this PTLR for the ART values used in development of the Pff limit curves.
15
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.4 Braidwood Unit 2 Calculation of Adjusted Reference Temperatures (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7056 Parameter                                        Values Operating Time                                      32 EFPY Location~ai                  l/4T ART (&deg;F)                3/4T ART(0 F)
Chemistry Factor, CF (&deg;F)                    26.0                          26.0 Fluence(f), n/cm..:
3.40xl0 18                    l.23xl018 (E>l.0 Mevib>
Fluence Factor, FF                      0.703                        0.460 ARTNor- CFxFF(&deg;F)                          18.3                          12.0 Initial RT NOT.* 1(&deg;F)                    30                            30 Marl?in, M(&deg;F)                        18.3                          12.0 ART= I+(CF*FF)+M, &deg;F 67                            54 per RO l.99, Revision 2 a) The Braidwood Unit 2 reactor vessel wall thickness is 8.5 inches at the beltline region.
18 b) Fluence, f, is the calculated peak clad/base metal interface fluencc (E>l.0 Mev) =5.67xl0 n/cm2 at 32 EFPY (Reference 11).
16
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.5 RTPTS Calculation for Braidwood Unit 2 Beltline Region Materials at EOL (32 EFPYia.b)
R.G.1.99,                                                IRTNDT<c)                        al<dl  Margin CF            Fluenee                                  4RTNDT      GuCc)                    RTPTS Reactor Vessel Material              Rev.2                                          FF (oF)      (nlcm1 , E>l.O MeV)                  (oF)        (of)      (OF)    (OF)      (Of)    (oF)
Position Nozzle Shell Forging                1.1        26          0.559 x 1019      0.8373        30        21.8        0    10.9      21.8      74 Intermediate Shell Forging              I.I        20            1.73 x 1019        1.1508      -30        23.0        0    11.5      23.0      16 19 Lower Shell Forging                  l.l        37            l.73x 10          1.1508        -30        42.6        0      17        34      47
-Using non-credible surveillance data          2.l      13.2          1.73 x 1019        1.1508      -30        15.2        0      7.6      15.2      0 Nozzle to Intermediate Shell Forging Circ. Weld Seam                1.1        54          0.559x 1019        0.8373        -25        45.2        0    22.6    45.2      65 (Heal # H4498)
Intermediate 10 Lower Shell Forging Circ. Weld Seam                1.1        41            1.67 x 1019        1.1413        40        46.8        0    23.4    46.8      134 (Heal # 442011)
  -Using credible surveillance data            2.1      26.l          1.67 x 1019        l.1413        40        29.8        0      14      28      98
  ~:
(a)  The 10 CFR 50.61 methodology was utilized in the calculation of the RT!"TS values.
(b)  The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14), Table 5.5-2.
(c)  Initial RTNOT values are based on measured data. Hence, Gu= 0&deg;F.
(d)  Per the guidance of 10 CFR 50.61, the base metal aA = 17&deg;F for Position 1.1 (without surveillance data) and for Position 2. 1 with non-credible surveillance data; the weld metal GA= 28&deg;F for Position I.I (without surveillance data) and with credible surveillance data GA= 14&deg;F for Position 2.1. However, a A need not exceed O.S*aRTNDT*
17
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 6.0    References
: 1. WCAP-14040-NP-A, Revision 2, "Methodology Used to Develop Cold Overpressure Mitigating System Setpoints and RCS Heatup and Cooldown Limit Curves", J.D.
Andrachek, et al., January 1996.
: 2. NRC Letter from R. A. Capra to O.D. Kingsley, Commonwealth Edison Company, "Byron Station Units 1 and 2 and Braidwood Station Units 1 and 2, Acceptance for referring of pressure temperature limits report, (M98799, M98800, M98801, and M98802)," January 21, 1998.
: 3. Westinghouse Letter to Exelon Nuclear, CAE-10-MUR-197, Revision 0, "Low Temperature Overpressure Protection (LTOP) System Evaluation Final Letter Report,"
M.P. Rudakewiz, September 8, 2010.
: 4. WCAP-11188, "Commonwealth Edison Company, Braidwood Station Unit 2 Reactor Vessel Surveillance Program," December 1986.
: 5. WCAP-15369, "Analysis of Capsule W from the Commonwealth Edison Company Braidwood Unit 2 Reactor Vessel Radiation Surveillance Program," March 2000.
: 6. WCAP-15381, "Evaluation of Pressurized Thermal Shock for Braidwood Unit 2", T.J.
Laubham, September 2000.
: 7. NRC Letter from G. F. Dick, Jr., NRR, to C. Crane, Exelon Generation Company, LLC, "Issuance of Amendments: Revised Pressure-Temperature Limits Methodology; Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2," dated October 4, 2004.
: 8. Byron & Braidwood Design Information Transmittal DIT-BRW-2006-0051, "Transmittal of Braidwood Unit l and Unit 2 Temperature and Pressure Uncertainties for Low Temperature Overpressure System (LTOPS) Power Operated Relief Valves (PORVS)," Nathan (Joe) Wolff Jr., July 18, 2006.
: 9. NRC Letter from M. Chawla to O.D. Kingsley, Exelon Generation Company, LLC, "Issuance of exemption from the Requirements of 10 CFR 50 Part 60 and Appendix G for Byron Station, Units 1 and 2, and Braidwood Stations, Units 1 and 2," dated August 8, 2001.
: 10. NRC Letter from R. F. Kuntz, NRR, to C. M. Crane, Exelon Generation Company, LLC, "Byron Station, Unit Nos. 1 and 2, and Braidwood Station, Unit Nos. 1 and 2 -
Issuance of Amendments Re: Reactor Coolant System Pressure and Temperature Limits Report (TAC Nos. MC8693, MC8694, MC8695, and MC8696)," November 27, 2006.
: 11. WCAP- 15373, Revision 2, "Braidwood Unit 2 Heatup and Cooldown Limits for Normal Operation," T.J. Laubham et al., November 2003.
18
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT
: 12. WCAP-16143-P, Revision l, ..Reactor Vessel Closure Head/Vessel Flange Requirements Evaluation for Byron/Braidwood Units 1 and 2," W. Bamford, et al.,
October 2014.
: 13. Westinghouse Letter to Exelon Nuclear, CCE-07-24, ..Braidwood Unit 1and2 RCS HU/CD Limit Curve Table Values," dated February 15, 2007.
: 14. Westinghouse Calculation Note CN-AMLRS-10-7, Revision O. "Braidwood Units I and 2 Measurement Uncertainty Recapture (MURJ Uprate: Reactor Vessel Integrity Evaluations." A.E. Leicht, September 2010, and Westinghouse evaluation MCOE-LTR-13-102 Rev. 0, ..Byron and Braidwood Closure Head/Vessel Flange Region: MUR Uprate Assessment," November 2013.
l9
 
Exelon Gonorotion Company, LLC Brmdwood Station Exelon Generation<                                                      35100 South Route 53, Suito 64 Bracovitlo, IL 60401*9619 December 10, 2015 BW150112 U.S. Nuclear Regulatory Commission ATIN: Document Control Desk Washington, DC 20555-0001 Braidwood Station, Units 1 and 2 Facility Operating License Nos. NPF-72 and NPF-77 NRC Docket Nos. STN 50-456 and 50-457
 
==Subject:==
Braidwood Unit 1 - Pressure and Temperature Limits Reports (PTLRs), Revision 8 Braidwood Unit 2 - Pressure and Temperature Limits Reports (PTLRs), Revision 7
 
==Reference:==
Letter from U.S. NRC to B.C. Hanson (Exelon Generation Company, LLC),
              "Issuance of Amendments to Utilize WCAP-16143-P, Revision 1, "Reactor Vessel Closure HeadNessel Flange Requirements Evaluation for Byron/Braidwood Units 1 and 2," dated October 16, 2014," dated October 28, 2015 The purpose of this letter is to transmit the Pressure and Temperature Limits Reports (PTLRs) for Braidwood Station, Units 1 and 2 in accordance with Technical Specification (TS) 5.6.6, "Reactor Coolant System (RCS) Pressure and Temperature Limits Report (PTLR)."
The Braidwood Unit 1 and Unit 2 PTLRs were revised to update the reference to WCAP-16143-P, "Reactor Vessel Closure HeadNessel Flange Requirements Evaluation for Byron/Braidwood Units 1 and 2," from Revision Oto Revision 1 for consistency with the referenced Technical Specification Amendment.
Please direct any questions you may have regarding this matter to Mr. Phillip Raush, Regulatory Assurance Manager, at (815) 417-2800.
Marri Ma hionda-Palmer Site Vice resident Braidwood Station Attachments: 1. Braidwood Unit 1 Pressure Temperature Limits Report (PTLR), Revision 8 2 Braidwood Unit 2 Pressure Temperature Limits Report (PTLR), Revision 7
 
ATTACHMENT 1 Braidwood Unit 1 Pressure and Temperature Limits Report (PTLR), Revision 8
 
BRAIDWOOD UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT (PTLR)
Revision 8
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table of Contents Section                                                                      Page l .O  Introduction 2.0  RCS Pressure and Temperature Limits                                    L 2.1  RCS Pressure and Temperature (Pff) Limits (LCO 3.4.3)            1 3.0  Low Temperature Over Pressure Protection and Boltup                    7 3.1  LTOP System Setpoints (LCO 3.4.12)                              7 3.2  LTOP Enable Temperature                                          7 3.3  Reactor Vessel Boltup Temperature (Non-Technical Specification)  7 4.0    Reactor Vessel Material Surveillance Program                          10 5.0  Supplemental Data Tables                                              12 6.0  References                                                            18
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT List of Figures Figure                                                                    Page 2.1  Braidwood Unit 1 Reactor Coolant System Heatup Limitations (Heatup  3 Rate of 100&deg;F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 2.2  Braidwood Unit 1 Reactor Coolant System Cooldown Limitations        4 (Cooldown Rates of 0, 25, 50, and l00&deg;F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors)
: 3. 1 Braidwood Unit 1 Nominal PORV Setpoints for the Low Temperature    8 Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) ii
 
BRAIDWOOD
* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT List of Tables Table                                                              Page 2.la Braidwood Unit l Heatup Data Points at 32 EFPY (Without        5 Margins for Instrumentation Errors) 2.lb Braidwood Unit 1 Cooldown Data Points at 32 EFPY (Without      6 Margins for Instrumentation Errors) 3.1  Data Points for Braidwood Unit l Nominal PORV Setpoints for    9 the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) 4.1  Braidwood Unit l Surveillance Capsule Withdrawal Summary      11 5.1  Braidwood Unit l Calculation of Chemistry Factors Using        13 Surveillance Capsule Data 5.2  Braidwood Unit 1 Reactor Vessel Material Properties            14 5.3  Summary of Braidwood Unit 1 Adjusted Reference Temperature    15 (ART) Values at 1/4T and 3/4T Locations for 32 EFPY 5.4  Braidwood Unit 1 Calculation of Adjusted Reference            16 Temperatures (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7016 5.5  RTPTs Calculation for Braidwood Unit 1 Beltline Region        17 Materials at EOL (32 EFPY) iii
 
BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 1.0 Introduction This Pressure and Temperature Limits Report (PTLR) for Braidwood Unit 1 has been prepared in accordance with the requirements of Braidwood Technical Specification (TS) 5.6.6, "Reactor Coolant System (RCS) Pressure and Temperature Limits Report (PTLR)".
Revisions to the PTLR shall be provided to the NRC after issuance.
The Technical Specifications (TS) addressed in this report are listed below:
LCO 3.4.3 RCS Pressure and Temperature (Pff) Limits; and LCO 3.4.12 Low Temperature Overpressure Protection (LTOP) System.
2.0 RCS Pressure and Temperature Limits The PTLR limits for Braidwood Unit l were developed using a methodology specified in the Technical Specifications. The methodology listed in WCAP-14040-NP-A, Revision 2 (Reference 1) was used with the following exceptions:
a) Optional use of ASME Code Section XI, Appendix G, Article G-2000, 1996 Addenda, b) Use of ASME Code Case N-640, ..Alternative Reference Fracture Toughness for Development of P-T Limit Curves, Section XI, Di vision I",
c) Use of ASME Code Case N-588, "Alternative to Reference Flaw Orientation of Appendix G for Circumferential Welds in Reactor Vessel, Section XI, Division l ",
and d) Elimination of the flange requirements documented in WCAP-16143-P.
These exceptions to the methodology in WCAP 14040-NP-A, Revision 2 have been reviewed and accepted by the NRC in References 2, 8, 9 and I 0.
WCAP 15364, Revision 2 (Reference 11), provides the basis for the Braidwood Unit l Pff curves, along with the best estimate chemical compositions, fluence projections and adjusted reference temperatures used to determine these limits. WCAP-16143-P, Reference 12, documents the technical basis for the elimination of the flange requirements.
2.1    RCS Pressure and Temperature (Pff) Limits (LCO 3.4.3) 2.1.1 The RCS temperature rate-of-change limits defined in WCAP-15364, Revision 2 (Reference 11) are:
a A maximum heatup of 100&deg;F in any 1-hour period,
: b. A maximum cooldown of 100&deg;F in any I-hour period, and
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT
: c. A maximum temperature change of less than or equal to l0&deg;F in any I-hour period during inservice hydrostatic and leak testing operations above the heatup and cooldown limit curves.
: 2. 1.2 The RCS Pff limits for heatup, inservice hydrostatic and leak testing, and criticality are specified by Figure 2.1 and Table 2. la. The RCS Pff limits for cooldown are shown in Figure 2.2 and Table 2. lb. These limits are defined in WCAP-15364, Revision 2 (Reference 11). Consistent with the methodology described in Reference 1 and exceptions noted in Section 2.0, the RCS Pff limits for heatup and cooldown shown in Figures 2.1 and 2.2 are provided without margins for instrument error. These limits were developed using ASME Boiler and Pressure Vessel Code Section XI, Appendix G, Article G2000, 1996 Addenda.
The criticality limit curve specifies pressure-temperature limits for core operation to provide additional margin during actual power production as specified in 10 CFR 50, Appendix G.
The Pff limits for core operation (except for low power physics testing) are that the reactor vessel must be at a temperature equal to or higher than the minimum temperature required for the inservice hydrostatic test, and at least 40&deg;F higher than the minimum pennissible temperature in the corresponding Pff curve for heatup and cooldown.
2
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT MATERIAL PROPERTY BASIS '
LIMITING MATERIAL: NO:ZZLE SHELL FORGING SP-7016 LIMITING ART VALUES AT 32 EFPY: l/4T, 48&deg;F 3/4T, 35&deg;F 2500 *.
r
                                                                ;Leak Test Limit I        OpeMlm Verslon:5.1 Run:29844 2250 .
j                                                    Acceptable 2000 .                                                                        Operation Unacceptable Operation          j j
          -us    1750 C!J c.
1500  *I- Heatup Rate 100 Deg. F/Hr I II~        L--"'
Critical Limit 100 Deg. F/Hr
                                            ~
Cl)
:::J fl) fl)                                )
            !    1250 ..
: c.                      ,_-!      ,./
            'ti
            !    1000
:::J u          .
          "i                                                  Crltlcallty Limit based on 0      750 .                                        lnaervlce hydrostatic test
                                              ~                temperature (1 OS'F) for the service period up to 32 EFPY 500 Boltup I~
Temp 250 .
0 ..
IThe lower llmlt for RCS 1 pressure lso psla
                                              ~
n 0      50      100    150      200        250      300    350    400          450        500 550 Moderator Temperature (Deg. F)
Figure 2.1 Braidwood Unit 1 Reactor Coolant System Heatup Limitations (Heatup Rate of 100&deg;F/hr)
Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 3
 
BRAIDWOOD
* UNIT I PRESSURE AND TEMPERATURE LIMITS REPORT MATERIAL PROPERTY BASIS LIMITING MATERIAL: N07ZLE FORGING SP-7016 LIMITING ART VALUES AT32 El-"PY: l/4T, 48&deg;F 3/4T, 35&deg;F 2500 IOper11m Versl0'1:5.1 Run:29844 I 2250 .
Unacceptable Operation Acceptable 2000  ~
Operation CJ 1750 .
ii5 a.
Q)
:J fl) 1500 .                  J fl) 1250 ..
Q)
: a.          .
                              /1 Cooldown Rates 1ca  1000 .
(&deg;F/Hr) steady.state,
      '3                          -25, u                          -50, and
      'ii                        -100 0      750 500 .
                  .                        I 250
                              -            I Boltup Temp. I 0              ~
IJ!he lower llmlt for RCS I
pressure la Opsla            I I
0      50      100        150      200    250  300  350 400        450          500      550 Moderator Temperature (Deg. F)
Figure 2.2 Braidwood Unit 1 Reactor Coolant System Cooldown Limitations (Cooldown Rates of 0, 25, 50 and 100&deg;F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 4
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.la Braidwood Unit 1 Heatup Data Points at 32 EFPY (Without Margins for Instrumentation Errors)
Heatup Curve 100 F Heatup        Criticality        Leak Test Limit              Limit T (&deg;F)    P <osie:) T(&deg;F)    P (osi2) T<&deg;F)    P (osi iz) 60      Note I    108      Note I  91      2000 60      1064      108        1114    108      2485 65      1114      I to      1166 70      1166      115        1172 75      1172      120        1176 80      1176      125        1188 85      1188      130        1207 90      1207      135        1234 95      1234      140        1267 100      1267      145        1308 105      1308      150        1357 110      1357      155        1414 115      1414      160        1479 120      1479      165        1554 125      1554      170        1638 130      1638      175        1732 135      1732      180        1838 140      1838      185        1956 145      1956      190        2088 150      2088      195        2235 155      2235      200      2397 160      2397 Note l :The Minimum acceptable pressure is 0 psi a
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.lb Braidwood Unit 1 Cooldown Data Points at 32 EFPY (Without Margins for Instrumentation Errors)
Cooldown Curves Sleady Stale  25 &deg;F Cooldown    50 &deg;F Cooldown  100 &deg;F Cooldown T (&deg;F)  P (psig) T(&deg;F)  P (psig)  T (&deg;F)  P (psig) T (&deg;F)  P (psig) 60      Note 1  60    Note I      60    Note I    60      Note I 60      1082    60      1078      60      l078*    60      1078*
65      1133    65      1133      65      1133    65      1133 70      1188    70      t 188      70      1188    70      1188 75      1250    75      1250      75      1250    75      1250 80      1318    80      1318      80      1318    80      1318 85      1393    85      1393      85      1393    85      1393 90      1476    90      1476      90      1476    90      1476 95      1568    95      1568      95      1568    95      1568 100      1669    JOO    1669      100      1669    JOO      1669 105      1781    105    1781      105      1781    105      1781 110      1905    110    1905      110      1905    110      1905 115      2042    115    2042      115    2042    115    2042 120      2194    120    2194      120    2194    120    2194 125      2361    125    2361      125    2361    125    2361
* Refer to Reference 13 Note 1:The Minimum acceptable pressure is 0 psia 6
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 3.0 Low Temperature Overpressure Protection and Boltup This section provides the Braidwood Unit 1 power opemted relief valve lift settings, low temperature overpressure protection (LTOP) system arming temperature, and minimum reactor vessel boltup temperature.
3.1    LTOP System Setpoints (LCO 3.4.12)
The power operated relief valves (PORVs) shall each have maximum lift settings in accordance with Figure 3.1 and Table 3. l. These limits are based on References 3 and 4.
The LTOP setpoints are based on Pff limits which were established in accordance with 10 CFR 50, Appendix G without allowance for instrumentation error and in accordance with the methodology described in Reference l. The LTOP PORV nominal lift settings shown in Figure 3.1 and Table 3. 1 account for appropriate instrument error.
3.2    LTOP Enable Temperature Braidwood Unit 1 procedures governing the heatup and cooldown of the RCS require the arming of the LTOP System for RCS temperature of 350&deg;F and below and disarming of LTOP for RCS temperature above 350&deg;F.
Note that the last LTOP PORV segment in Table 3.1 extends to 400&deg;F where the pressure setpoint is 2335 psig. This is intended to prohibit PORV lift for an inadvertent LTOP system arming at power.
3.3    Reactor Vessel Boltup Temperature (Non-Technical Specification)
The minimum boltup temperature for the Reactor Vessel Flange shall be~ 60&deg;F. Boltup is a condition in which the Reactor Vessel head is installed with tension applied to any stud, and with the RCS vented to atmosphere.
7
 
BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT I 2335ps1g 2250 2000                                                                                I
_ 1750                                                                                I S!
~
! 1500                                                                            I I
: a. 1250 Unacceplable Operation I
I IC 2
.. 1000
*ec
~
750 595 pslg PCV-456 i
I II I
500 541 pslg
                                                        " ' PCV-455A 0
0              mo        150          200        250        300      350 Auctlaneenid Low RCS Temperaluni (DEG. F)
Figure 3.1 Braidwood Unit 1 Nominal PORV Setpoints for the Low Temperature Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) 8
 
BRAIDWOOD-UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 3.1 Data Points for Braidwood Unit 1 Nominal PORV Setpoints for the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)
PCV-455A                                              PCV-456 (ITY-0413M)                                            (ITY-0413P)
AUCTIONEERED LOW      RCS PRESSURE                    AUCTIONEERED LOW      RCS PRESSURE RCS TEMP. (DEG. F)        (PSIG)                      RCS TEMP. (DEG. F)        (PSIG) 60                541                                60                  595 300                541                              300                  595 400                2335                              400                  2335 Note: To determine nominal lift setpoints for RCS Pressure and RCS Temperatures greater than 300&deg;F, linearly interpolate between the 300&deg;F and 400&deg;F data points shown above. (Setpoints extend to 400&deg;F to prevent PORV liftoff from an inadvertent LTOP system arming while at power.)
9
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 4.0 Reactor Vessel Material Surveillance Program The pressure vessel material surveillance program (Reference 5) is in compliance with Appendix H to 10 CFR 50, "Reactor Vessel Radiation Surveillance Program." The material test requirements and the acceptance standard utilize the reference nil-ductility temperature, RTNDT, which is determined in accordance with ASME Boiler and Pressure Vessel Code Section III, NB-2331. The empirical relationship between RTNoT and the fracture toughness of the reactor vessel steel is developed in accordance with Appendix G, "Protection Against Non-Ductile Failure," to Section XI of the ASME Boiler and Pressure Vessel Code. The surveillance capsule removal schedule meets the requirements of ASTM El85-82.
The third and final reactor vessel material irradiation surveillance specimens (Capsule W) have been removed and analyzed to determine changes in material properties. The surveillance capsule testing has been completed for the original operating period. The remaining three capsules, V, Y, and Z, were removed and placed in the spent fuel pool to avoid excessive fluence accumulation should they be needed to support life extension.
The removal summary is provided in Table 4.1.
10
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT
                                                  .Table 4.1 Braidwood Unit 1 Capsule Withdrawal Summary(*)
Capsule                                                                            Fluence Capsule                            Lead Factor            Withdrawal EFPY<b>
Location                                                                    (n/cm2, E>l.O MeV) u              58.5&deg;                4.02                          1.16                      0.388 x 10 19 x            238.5&deg;                4.06                          4.30                        1.17 x 10 19 w            121.5&deg;                4.05                          7.79                        l.98 x 1019 z<c) 301.5&deg;                4.09                  12.01 (EOC 10)                    2.79 x 10 19 y(c) 61.0&deg;                3.92                  17.69 (EOC 14)                    3.71 x 10 19 y<c) 241.0&deg;                3.81                  12.01 (EOC 10)                    2.60 x 1019 Notes:
(a)  Source document is CN-AMLRS-I0-7 (Reference 14), Table 5.7-3.
(b)  Effective Full Power Years (EFPY) from plant startup.
(c)  Standby Capsules Z, V, and Y were removed and placed in the spent fuel pool. No testing or analysis has been performed on these capsules. If license renewal is sought, one of these standby capsules may nt!ed to be tested to determine the effect of neutron irradiation on the reactor vessel surveillance materials during the period of ex1ended operation.
ll
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 5.0 Supplemental Data Tables The foJlowing tables provide supplemental information on reactor vessel material properties and are provided to be consistent with Generic Letter 96-03. Some of the material property values shown were used as inputs to the Pff limits.
Table 5.1 shows the calculation of the surveillance material chemistry factors using surveillance capsule data.
Table 5.2 provides the reactor vessel material properties table.
Table 5.3 provides a summary of the Braidwood Unit I adjusted reference temperature (ART) values at the l/4T and 3/4T locations for 32 EFPY.
Table 5.4 shows the calculation of ARTs at 32 EFPY for the limiting Braidwood Unit I reactor vessel material, i.e. weld WF-562 ( HT # 442011, Based on Surveillance Capsules U and X Data).
Table 5.5 provides the RTns calculation for Braidwood Unit 1 Beltline Region Materials at EOL (32 EFPY), (Reference 7).
12
 
BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.1 Braidwood Unit 1 Calculation of Chemistry Factors Using Surveillance Capsule Data<11 >
Capsule f<bl                .1.RTNllTlbl FP.1.RTNDT Material            Capsule                                    FF<c1                                FF2 (n/cm2, E > 1.0 MeV)                    (oF)          (oF) u                    0.388 x 1019      0.738        5.78          4.26      0.54 Lower Shell Forging                x                    1.17 x 10 19 1.044        38.23        39.91      1.09 (Tangential) w                    1.98 x 1019      1.186        24.14        28.64      1.41 u                    0.388 x 10  19 0.738        o.01d1        0.00      0.54 Lower Shell Forging                x                    1.17 x 10 19 1.044        28.75        30.01      1.09 (Axial) w                    1.98 x 1019      1.186        37. 11        44.03      1.41 SUM:      146.85    6.08 CF LSForJini    =L(FF *.1.RTNoT) + L(FF2) =(146.85) + (6.08) =24.1&deg;F u                    0.388 x 1019      0.738        17.06          12.59    0.54 Braidwood Unit 1 Surveillance Weld            x                    1.17 x 1019      1.044        30.15        31.47      1.09 Material w                    1.98 x 10 19 1.186        49.68        58.94      1.41 Braidwood Unit 2 u                    0.388 x 1019      0.738        o.o<d>        0.00      0.54 Surveillance Weld            x                    1.15 x 10 19 1.039        26.3        27.33      1.08 Material w                    2.07 x 10 19 1.198        23.9        28.63      1.44 SUM:      158.96      6.10 CF Wckll'.lcw    =L(FF "'ARTNoT) + L(FF ) =(158.96) + (6.10) =26.l&deg;F 2
~:
(a)    Source document is CN-AMLRS-10-7 (Reference 14), Table 5.2-1.
(b)    f = fluence; .1.RTNOT values are the measured 30 ft-lb shift values taken from Reference 6.
(c)        =
FF fluence factor  =r  0*28
* o.io*1og I)
(d)    Measured ARTNm values were determined to be negative, but physically a reduction should not occur; therefore, conservative values of zero are used.
IJ
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.2
                        .Braidwood Unit 1 Reactor Vessel Material Properties Chemistry            Initial Material Description                Cu(%)          Ni(%)
Factor      RT NOT {&deg;F)(a)
Closure Head Flange Heat# 5P738 l/3P6406 0.1 l        0.67              --              -20 Vessel Flange Heat # 122N357V                        --          0.77              --              -10 Nozzle Shell Forging
* 26.0&deg;Pb>
0.04          0.73                              10 Heat# 5P-7016 Intermediate Shell Forging
* 0.05          0.73        3 l .0&deg;Pb>          -30 Heat # [49D383/49C344)-1-1 0
Lower Shell Forging
* 31.0&deg;F '
0.05          0.74        24.l ope>            -20 Heat# [49D867/49C813]-l-l Circumferential Weld*                                              4l.0&deg;Pb>
(Intermediate Shell to Lower Shell)          0.03          0.67        26.1 ope>            40 WF-562 (HT# 442011)
Upper Circumferential Weld*
(Nozzle Shell to Intermediate Shell)        0.04          0.46        54.oopbl            -25 WF-645 (HT# H4498)
* Beltline Region Materials a) The Initial RTNoTvalues for the plates and welds are based on measured data.
b) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 1.1.
c) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 2.1.
14
 
BRAIDWOOD
* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT
                                              .Table 5.3 Summary of Braidwood Unit 1 Adjusted Reference Temperature (ART) Values at l/4T and 3/4T Locations for 32 EFPv1*>
32 EFPY Surface Flucncc Reactor Vcssel Material                                              1/4TART            3/4TART (n/cm2, E>l.O McV)
(OF)              (oF)
Nozzle Shell Forging                        0.586 lt 1019              47                34 19 Intermediate Shell Forging                      1.76 x 10                33                15 Lower Shell Forging                          1.76 x 10 19              43                25
-.Using credible surveillance data                  1.76 x 10 19              21                15 Nozzle to Intermediate Shell Forging Circ. Weld Seam                          0 .586x 1019              52                25 (Heat # H4498)
Intermediate to Lower Shell Forging Circ. Weld Seam                            1.70 x 10 19              122                99 (Heat# 442011)
-Using credible surveillance data                  1.70 x 1019              93                78
~:
(a)  The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14),
Tables 5.3. 1-1 and 5.3.1-2. The ART values summarized in this table utilize the most recent fluence projections and materials data, but were not used in development of the Pff limit curves. See Figures 2.1 and 2.2 of this PTLR for the ART values used in development of the Pff limit curves.
15
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT
                                      .Table 5.4 Braidwood Unit 1 Calculation of Adjusted Reference Temperatures (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7016 Parameter                                      Values Operating Time                                    32 EFPY Locationtai                  l/4T ART(&deg;F)                3/4T ART(&deg;F)
Chemistry Factor, CF (&deg;F)                    26.0                        26.0 Fluence(t), n/cml 3.65 x 1018                  l.32 xl0 18 (E> 1.0 Mev)<b>
Fluence Factor, FF                      0.772                      0.475 i1RTNor= CFxFF(&deg;F)                        18.8                        12.4 Initial RT Nor.* 1(&deg;F)                    10                          10 Margin, M (&deg;F)                          18.8                        12.4 ART= I+(CF*FF)+M,&deg;F 48                          35 per RG 1.99, Revision 2 (a) The Braidwood Unit I reactor vessel wall thickness is 8.5 inches at the beltline region.
(b) Flucnce r, is based upon f,wf (E > 1.0 Mev) = 6.08 x 1018 at 32 EFPY (Reference 11).
l6
 
BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.5 RTPTS Calculation for Braidwood Unit 1 Beltline Region Materials at EOL (32 EFPYi*,h>
(c R.G.1.99,                                                IRTNDT                    Cfu<c>  CfJ.(d) Margin CF            Fluence                            I      .ARTNDT                              RTFrS Reactor Vessel Material              Rev.2      (oF)    (n/cm2, E>l.O MeV)
FF (oF)      (Of)    {of)      (oF)  (Of)
Position                                                  (OF)
Nozzle Shell Forging                  1.1        26        0.586 x 1019          0.8504        10        22. l        0    l l.l      22.l  54 Intennediate Shell Forging              l.l        31        1.76 x 10 19        1.1554        -30        35.8        0      17        34    40 Lower Shell Forging                  1.1        31        1.76 x 1019          1.1554        -20        35.8        0      17        34    50
-+Using credible surveillance data          2.1        24.l        l.76x 1019          l.l554        -20        27.8        0      8.5        17    25 Nozzle to Intermediate Shell Forging Circ. Weld Seam                  I.I        54        0.586x 10 19          0.8504        -25        45.9        0    23.0      45.9    67 (Heat # H4498)
Intermediate to Lower Shell Forging Circ. Weld Seam                  I.I        41        1.70 x 1019          1.1461        40        47.0        0    23.5      47.0    134 (Heat# 442011)
-+Using credible surveillance data          2. 1      26.l        1.70 x 1019          1.1461        40        29.9        0      14        28    98 Notes:
(a) The 10 CFR 50.61 methodology was uti.lized in the calculation of the RTPTS values.
(b) The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14), Table 5.5-l.
(c) Initial RTNDT values are based on measured data. Hence, Gu= 0&deg;F.
                                                            =
(d) Per the guidance of 10 CFR 50.61, the base metal a11 l 7&deg;F for Position 1.1 (without surveillance data) and with credible surveillance data a4 = 8.5&deg;F for Position 2.1; the weld metal a 4 =28&deg;F for Position I.I (without surveillance data) and with credible surveillance data cr4 =
14&deg;F for Position 2.1. However, cr4 need not exceed 0.5*.6.RTNDT*
17
 
BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 6.0    References
: 1. WCAP-14040-NP-A, Revision 2, "Methodology Used to Develop Cold Overpressure Mitigating System Setpoints and RCS Heatup and Cooldown Limit Curves," J.D. Andrachek, et al., January 1996.
: 2. NRC Letter from R. A. Capra to O.D. Kingsley, Commonwealth Edison Company, "Byron Station Units 1 and 2 and Braidwood Station Units 1 and 2, Acceptance for referring of pressure temperature limits report, (M98799, M98800, M98801, and M98802)," January 21 1998.
: 3. Westinghouse Letter to Exelon Nuclear, CAE-10-MUR-197, Revision 0, "Low Temperature Overpressure Protection (LTOP) System Evaluation Final Letter Report," M.P. Rudakewiz, September 8, 2010.
: 4. Byron & Braidwood Design Information Transmittal DIT-BRW-2006-0051, "Transmittal of Braidwood Unit 1 and Unit 2 Temperature and Pressure Uncertainties for Low Temperature Overpressure System (LTOPS) Power Operated Relief Valves (PORVS)," Nathan (Joe)
Wolff Jr., July 18, 2006.
: 5. WCAP-9807, "Commonwealth Edison Company, Braidwood Station Unit 1 Reactor Vessel Radiation Surveillance Program," S.E. Yanichko, et al., February 1981.
: 6. WCAP-15316, Revision l, "Analysis of Capsule W from Commonwealth Edison Company Braidwood Unit l Reactor Vessel Radiation Surveillance Program," E. Terek, et al.,
December 1999.
: 7. WCAP-15365, Revision l, "Evaluation of Pressurized Thermal Shock for Braidwood Unit l," J.H. Ledger, January 2002.
: 8. NRC Letter from G. F. Dick, Jr., NRR, to C. Crane, Exelon Generation Company, LLC, "Issuance of Amendments: Revised Pressure-Temperature Limits Methodology; Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2," dated October 4, 2004.
: 9. NRC Letter from M. Chawla to O.D. Kingsley, Exelon Generation Company, LLC, "Issuance of exemption from the Requirements of 10 CFR 50 Part 60 and Appendix G for Byron Station, Units l and 2, and Braidwood Stations, Units 1 and 2," dated August 8, 200 l .
: 10. NRC Letter from R. F. Kuntz, NRR, to C. M. Crane, Exelon Generation Company, LLC, "Byron Station, Unit Nos. 1 and 2, and Braidwood Station, Unit Nos. 1 and 2- Issuance of Amendments Re: Reactor Coolant System Pressure and Temperature Limits Report (TAC Nos. MC8693, MC8694, MC8695, and MC8696)," November 27, 2006.
18
 
BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT
: 11. WCAP-15364, Revision 2, "Braidwood Unit 1 Heatup and Cooldown Limit Curves for Normal Operation," T.J. Laubham, November 2003.
: 12. WCAP-16143-P, Revision I, "Reactor Vessel Closure Head/Vessel Flange Requirements Evaluation for Byron/Braidwood Units I and 2," W. Bamford, et al., October 2014.
: 13. Westinghouse Letter to Exelon Nuclear, CCE-07-24, "Braidwood Unit I and 2 RCS HU/CD Limit Curve Table Values," dated February 15, 2007.
: 14. Westinghouse Calculation Note CN-AMLRS-10-7, Revision 0, "Braidwood Units 1 and:?
Measurement Uncc11ainty Recapture (MUR) Uprate: Reactor Vessel Integrity Evaluations,"
A.E. Leicht. September 2010.
19
 
ATTACHMENT 2 Braidwood Unit 2 Pressure and Temperature Limits Report (PTLR), Revision 7
 
BRAIDWOOD UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT (PTLR)
Revision 7
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table of Contents Section                                                                      Page 1.0  Introduction                                                            1 2.0  RCS Pressure Temperature Limits 2.1  RCS Pressure and Temperature (P/f) Limits (LCO 3.4.3) 3.0    Low Temperature Over Pressure Protection and Boltup                      7 3.1  LTOP System Setpoints (LCO 3.4.12)                                7 3.2  LTOP Enable Temperature                                            7 3.3  Reactor Vessel Boltup Temperature (Non-Technical Specification)    7 4.0    Reactor Vessel Material Surveillance Program                            10 5.0    Supplemental Data Tables                                                12 6.0    References                                                              18
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATORE LIMITS REPORT List of Figures Figure                                                                        Page 2.1 Braidwood Unit 2 Reactor Coolant System Heatup Limitations              3 (Heatup Rate of l 00&deg;F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 2.2 Braidwood Unit 2 Reactor Coolant System Cooldown Limitations            4 (Cooldown Rates of 0, 25, 50 and 100&deg;F/hr) Applicable to 32 EFPY (Without Margins for Instrumentation Errors) 3.1  Braidwood Unit 2 Nominal PORV Setpoints for the Low Temperature        8 Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)
 
BRAIDWOOD .. UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT List of Tables Table                                                          Page
: 2. la Braidwood Unit 2 Heatup Data at 32 EFPY (Without          5 Margins for Instrumentation Errors)
: 2. lb Braidwood Unit 2 Cooldown Data Points 32 EFPY (Without    6 Margins for lnstrumentation Errors)
: 3. l Data Points for Braidwood Unit 2 Nominal PORV            9 Setpoints for the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)
: 4. 1  Braidwood Unit 2 Capsule Withdrawal Summary              11 5.1  Braidwood Unit 2 Calculation of Chemistry Factors Using  13 Surveillance Capsule Data 5.2  Braidwood Unit 2 Reactor Vessel Material Properties      14 5.3  Summary of Braidwood Unit 2 Adjusted Reference          15 Temperature (ART) Values at l/4T and 3/4T Locations for 32 EFPY 5.4  Braidwood Unit 2 Calculation of Adjusted Reference      16 Temperature (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7056 5.5  RTPTS Calculation for Braidwood Unit 2 Beltline Region  17 Materials at EOL (32 EFPY)
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 1.0    Introduction This Pressure and Temperature Limits Report (PTLR) for Braidwood Unit 2 has been prepared in accordance with the requirements of Braidwood Technical Specification (TS) 5.6.6, "Reactor Coolant System (RCS) Pressure and Temperature Limits Report (PTLR)". Revisions to the PTLR shall be provided to the NRC after issuance.
The Technical Specifications addressed in this report are listed below:
LCO 3.4.3 RCS Pressure and Temperature (Pff) Limits; and LCO 3.4.12 Low Temperature Overpressure Protection (LTOP) System.
2.0    RCS Pressure Temperature Limits The PTLR limits for Braidwood Unit 2 were developed using a methodology specified in the Technical Specifications. The methodology listed in WCAP-14040-NP-A, Revision 2 (Reference I) was used with the following exception:
a) Optional use of ASME Code Section XI, Appendix G, Article G-2000, 1996 Addenda, b) Use of ASME Code Case N-640, "Alternative Reference Fracture Toughness for Development of P-T Limit Curves, Section XI, Division l", and c) Use of ASME Code Case N-588, "Alternative to Reference Flaw Orientation of Appendix G for Circumferential Welds in Reactor Vessel, Section XI, Division 1", and d) Elimination of the flange requirements documented in WCAP-16143-P.
This exception to the methodology in WCAP 14040-NP-A, Revision 2 has been reviewed and accepted by the NRC in References 2, 7, 9, and 10.
WCAP 15373, Revision 2 (Reference 11), provides the basis for the Braidwood Unit 2 Pff curves, along with the best estimate chemical compositions, fluence projections and adjusted reference temperatures used to detennine these limits.
WCAP-16143-P, Reference 12, documents the technical basis for the elimination of the flange requirements.
2.1    RCS Pressure and Temperature (Pff) Limits (LCO 3.4.3) 2.1. l The RCS temperature rate-of-change limits defined in Reference 11 are:
: a. A maximum heatup of 100&deg;F in any I-hour period.
: b. A maximum cooldown of 100&deg;F in any I-hour period, and 1
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT                          .
: c. A maximum temperature change of less than or equal to l0&deg;F in any I-hour period during inservice hydrostatic and leak testing operations above the heatup and cooldown limit curves.
2.1.2 The RCS Pff limiL'i for heatup, inservice hydrostatic and leak testing, and criticality are specified by Figure 2.1 and Table 2.1 a. The RCS Pff limits for cooldown are shown in Figure 2.2 and Table 2.1 b. These limits are defined in WCAP-15373, Revision 2 (Reference 11). Consistent with the methodology described in Reference l, with the exception noted in Section 2.0, the RCS Pff limits for heatup and cooldown shown in Figures 2.1 and 2.2 are provided without margins for instrument error. These limits were developed using ASME Boiler and Pressure Vessel Code Section XI, Appendix G, Article G2000, 1996 Addenda. The criticality limit curve specifies pressure-temperature limits for core operation to provide additional margin during actual power production as specified in LO CFR 50, Appendix G.
The Pff limits for core operation (except for low power physics testing) are that the reactor vessel must be at a temperature equal to or higher than the minimum temperature required for the inservice hydrostatic test, and at least 40&deg;F higher than the minimum permissible temperature in the corresponding Pff curve for heatup and cooldown.
2
 
BRAIDWOOD* UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Material Proocrty Basis Limiting Material: Circumferential Weld WF-562 & Nozzle Shell Forging Limiting ART Values at 32 EFPY l/4T 93&deg;F (N-588) & 67&deg;F ('96 App. G) 3/4T 79&deg;F (N-588) & 54&deg;F ('96 App. G) 2500 *.
2250
                                                      ,'    Leak Test Limit IOper1im Verslon:5.1 Aun: 19017
              .                    j                                                      Acceptable 2000                                                                              Operation Unacceptable
              *-        Operation              J
-      1750 I      )
CJ Ci)
-...          --.. . . . . IJ tI CL      1500 .
CD 1DO Deg. F/Hr                        r- Crltlcal  Limit 100 Deg. F/Hr
  ~
1250 .
U)
U)
CL
  ...CD      .
_V ~
"Cl CD    1000 .            ,..-        ...
  ~
u ca      750 Crltlcallty Limit b ased on lnservlca hydrostatic test 0                                        -
                                          ,                  temperature (127"F) for the service period up to 32 EFPY 500 .
Boltup Temp 250
                                                !The lower llmlt for RCS 0              ,_          .....-                o 1presaura Is psla 0        50      100        150        200        250      300        350 400        450        500        550 Moderator Temperature (Deg. F)
Figure 2.1 Braidwood Unit 2 Reactor Coolant System Heatup Limitations (Heatup Rate of 100&deg;F/hr)
Applicable to 32 EFPY (Without Margins for Instrumentation Errors) 3
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Material Property Basis Limiting Malerial: Circumferential Weld WF-562 & Nozzle Shell Forging Limiting ART Values at 32 EFPY 1/4T 93&deg;F (N-588) & 67&deg;F ('96 App. G) 3/4T 79&deg;F (N-588) & 54&deg;F ('96 App. G) 2500 Oper11m Version:5.1 Run:19017 I f
2250    -
                . Unacceptable Operation Acceptable 2000                                                                      Operation
-      1750                            J CJ Ci5 a.
u    1500  -                    I
  ~
  ,,,en                          J I
  !    1250    -
                          ,Ii a.
"C u
m 1000
  ~
u
'ii Cooldown Rates
(&deg;F/Hr) steady-state,
                                  *25, 0                                *50, and 750                      *100 500 I
250 I
Boltup Temp.      I LJ;rh* lower limit for RCS I
0 -          -    -
I pressure lso psla I
0      50      100        150    200      250    300    350 400      450        500      550 Moderator Temperature (Deg. F)
Figure 2.2 Braidwood Unit 2 Reactor Coolant System Cooldown Limitations (Cooldown Rates of O, 25, 50 and 100&deg;F/hr) Applicable to 32 EFPY (Without Margins of Instrumentation Errors) 4
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.la Braidwood Unit 2 Heatup Data Points at 32 EFPY (Without Margins for Instrumentation Errors)
Heatup Curve 100 F Heatup      Criticality Limit    Leak Test Limit T (&deg;F)    P (psig)  T (&deg;F)      P (psig) T ("F)    P (psig) 60      Note I    127        Note I    110      2000 60        924      127          965    127      2485 65        965      127        977*
70        977      127          977 75          977      127          981 80        977      130          990 85        981      135        1005 90        990      140        1025 95        1005      145        1051 100        1025      150        1081 105        1051      155        1118 110        1081      160        1161 115        1118      165        1210 120        1161      170        1266 125        1210      175        1329 130        1266      180        1400 135      1329      185        1480 140        1400      190        1569 145      1480      195        1668 150        1569      200        1778 155      1668      205        1901 160      1778      210        2036 165        1901      215        2186 170      2036      220        2353 175      2186 180      2353
* Refer to Reference  l3 Note 1:      The Minimum acceptable pressure is 0 psia 5
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.lb Braidwood Unit 2 Cooldown Data at 32 EFPY (Without Margins for Instrumentation Errors)
Cooldown Curves Steady State    25 &deg;F Cooldown    50 &deg;F Cooldown  I00 &deg;F Cooldown T ("F)    P (psig) T (&deg;F) P (psig)  T (&deg;F) P (psig)  T (&deg;F)    P (psig) 60      Note I    60      Note I      60    Note I  60      Note 1 60        931    60        908      60      889    60        866 65        965    65        946      65      932    65        921 70        1003    70        989      70      980    70        980 75        1045    75      1036      75      1033    75      1033 80      1092    80      1088      80      l088    80      1088 85      1143    85      1143      85      1143    85      1143 90        1200    90      1200      90      1200    90      1200 95        1263    95      1263      95      1263    95      1263 100      1332    100      1332      too      1332    100      1332
        !05      1409    !05      1409      l05      1409    105      1409 110      1494    110      1494      110      1494    110      1494 115      1587    115      1587      115      1587    115      1587 120      1691    120      1691      120      1691    120      1691 125      1805    125      1805      125      1805    125      1805 130      1932    130      1932      130      1932    130      1932 135      2071    135      2071      135      2071    135      2071 140      2226    140      2226      140      2226    140      2226 145      2396    145      2396      145      2396    145      2396 Note 1:    The Minimum acceptable pressure is 0 psia 6
 
BRAIDWOOD~ UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 3.0 Low Temperature Overpressure Protection and Boltup This section provides the Braidwood Unit 2 power operated relief valve lift settings, low temperature overpressure protection (LTOP) system arming temperature, and minimum reactor vessel boltup tempemture.
3.1    LTOP System Setpoints (LCO 3.4.12).
The power operated relief valves (PORVs) shall each have nominal lift settings in accordance with Figure 3.1 and Table 3.1. These limits are based on References 3 and 8.
The LTOP setpoints are based on Pff limits that were established in accordance with IO CFR 50, Appendix G without allowance for instrumentation error. The LTOP setpoints were developed using the methodology described in Reference
: 1. The LTOP PORV nominal lift settings shown in Figure 3.1 and Table 3.1 account for appropriate instrument error.
3.2    LTOP Enable Temperature Braidwood Unit 2 procedures governing the heatup and cooldown of the RCS require the arming of the LTOP System for RCS temperature of 350&deg;F and below and disarming of LTOP for RCS temperature above 350&deg;F.
Note that the last LTOP PORV segment in Table 3.1 extends to 400&deg;F where the pressure setpoint is 2335 psig. This is intended to prohibit PORV lift for an inadvertent LTOP system arming at power.
3.3    Reactor Vessel Boltup Temperature (Non-Technical Specification)
The minimum boltup temperature for the Reactor Vessel Flange shall be~ 60&deg;F.
Boltup is a condition in which the Reactor Vessel head is installed with tension applied to any stud, and with the RCS vented to atmosphere.
7
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 2500 I i33Spslg 2250 2000 I
m;o                                                                              I 8
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1250 Unocceplable Operation I
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639 psig PCV456
                                      !                                  I I
599pelg                                  '\.
                                                            " PCV455A 0
0                100      150          200          250      300      350    400 Auctlon. .red Low RCS Temp1mure IDEG. F)
Figure 3.1 Braidwood Unit 2 Nominal PORV Setpoints for the Low Temperature Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) 8
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 3.1 Data Points for Braidwood Unit 2 Nominal PORV Setpoints for the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)
PCV-455A                                            PCV-456 RCS TEMP.          RCS Pressure                    RCS TEMP.      RCS Pressure (DEG. F)              (PSIG)                        (DEG. F)        (PSIG) 60                  599                            60              639 300                  599                          300              639 400                2335                          400            2335 Note: To determine nominal lift setpoints for RCS Pressure and RCS Temperatures greater than 300&deg;F, linearly interpolate between the 300&deg;F and 400&deg;F data points shown above. (Setpoints extend to 400&deg;F to prevent PORV liftoff from an inadvertent LTOP system arming while at power).
9
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 4.0 Reactor Vessel Material Surveillance Program The pressure vessel material surveillance program (Reference 4) is in compliance with Appendix H to 10 CFR 50, "Reactor Vessel Radiation Surveillance Program." The material test requirements and the acceptance standards utilize the reference nil-ductility temperature, RTNOT, which is determined in accordance with ASME Boiler and Pressure Vessel Code, Section III, NB-2331.
The empirical relationship between RT NOT and the fracture toughness of the reactor vessel steel is developed in accordance with Appendix G, "Protection Against Non-Ductile Failure," to Section XI of the ASME Boiler and Pressure Vessel Code. The surveillance capsule removal schedule meets the requirements of ASTM E 185-82.
The third and final reactor vessel material irradiation surveillance specimens (Capsule W) have been removed and analyzed to determine changes in material properties. The surveillance capsule testing has been completed for the original operating period. The remaining three capsules, V, Y, and Z, were removed and placed in the spent fuel pool to avoid excessive fluence accumulation should they be needed to support life extension. The removal summary is provided in Table4.1.
IO
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 4.1 Braidwood Unit 2 Capsule Withdrawal Summary'0 >
Capsule                                                                  Fluence Capsule                    Lead Factor        Withdrawal EFPY<">
Location                                                          (n/cm2,  E>l.O MeV) u          58.5&deg;              4.08                      l.18                  0 .388 x 10 19 x          238.5&deg;              4.03                    4.24                      1.15 x 10 19 w          121.5&deg;              4.06                    8.56                    2.07 x 1019 zCc) 301.5&deg;              4.14              12.78 (EOC 10)                  2.83 x 10 19 y(c) 61.0&deg;              3.92              18.42 (EOC 14)                  3.73 x 1019 y<c>        241 .0&deg;            3.89              12.78 (EOC 10)                  2.66 x 1019 Notes:
(a)  Source document is CN-AMLRS-10-7 (Reference 14), Table 5.7-4.
(b)  Effective Full Power Years (EFPY) from plant startup.
(c)  Standby Capsules Z, V, and Y were removed and placed in the spent fuel pool. No testing or analysis has been performed on these capsules. If license renewal is sought, one of these standby capsules may need to be tested to detennine the effect of neulron irradiation on the reactor vessel surveillance materials during the period of extended operation.
11
 
BRAIDWOOD* UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 5.0 Supplemental Data Tables The following tables provide supplemental information on reactor vessel material properties and are provided to be consistent with Generic Letter 96-03.
Some of the material property values shown were used as inputs to the Pff limits.
Table 5.1 shows the calculation of the surveillance material chemistry factors using surveillance capsule data.
Table 5.2 provides the reactor vessel material properties table.
Table 5.3 provides a summary of the Braidwood Unit 2 adjusted reference temperature (ART) values at the l/4T and 3/4T locations for 32 EFPY.
Table 5.4 shows the calculation of ARTs at 32 EFPY for the limiting Braidwood Unit 2 reactor vessel material.
Table 5.5 provides the RTPTS Calculation for Braidwood Unit 2 Beltline Region Materials at EOL (32 EFPY), (Reference 6).
12
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.1 Braidwood Unit 2 Calculation of Chemistry Factors Using Surveillance Capsule Data<0 >
Capsule rb1                ARTNDT(b)      FF*ARTNDT Material          Capsule                                FF<cl                                FF2 (n/cm1, E > 1.0 MeV)                  (oF)          (oF)
Lower Shell u                0.388 x 1019      0.738      o.o<d1          0.00      0.54 Forging              x                  1.15 x 1019      1.039      o.o<d>          0.00      1.08 (Tangential) w                2.07 x 10  19 1.198        4.53          5.43      1.44 u                0.388 x 1019      0.738      o.o<d1          0.00      0.54 Lower Shell Forging              x                  1.15 x rn 19 1.039      33.94          35.26      1.08 (Axial) w                2.07 x 1019      1.198        33.2          39.78      1.44 SUM:        80.47      6.12 CF LS Forging= L(FF *ARTNO'T) +  :E(FF2) = (80.47) + (6.12) = 13.2&deg;F Braidwood Unit I u                0.388 x rn 19      0.738      17.06          12.59      0.54 Surveillance Weld          x                  1.17 x 10 19 1.044      30.15          31.47      1.09 Material w                  1.98 x 1019      1.186      49.68          58.94      1.41 Braidwood Unit 2 u                0.388 x 10  19 0.738      o.o<d>          0.00      0.54 Surveillance Weld          x                1.15 x 10  19 1.039        26.3          27.33      1.08 Material w                2.07 x 10  19 1.198        23.9          28.63      1.44 SUM:        158.96      6.10 CF Weld Mew= L(FF *ARTNor)+ L(FF2) = (158.96) + (6.IO) = 26.PF Notes:
(a)    Source document is CN-AMLRS-10-7 (Reference 14), Table 5.2-2.
(b)    f= fluence; ARTNDT values are the measured 30 ft-lb shift values taken from Reference 5.
(c)    FF= fluence faclor =(0*28
* o.io*ioa 0 (d)    Measured ARTNDT values were determined to be negative, but physically a reduction should not occur; therefore, conservative values of zero are used.
13
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.2 Braidwood Unit 2 Reactor Vessel Material Properties Chemistry            Initial Material Description                  Cu(%)        Ni(%)                      RT NDT (&deg;F)(o)
Factor Closure Head Flange Heat# 3P6566/5P7547/4P6986                      --          0.75            --                20 Serial# 2031-V-1 Vessel Flange Heat # 124P455 0.07          0.70            --                20 Nozzle Shell Forging
* 26.0&deg;Fbl 0.04          0.90                              30 Heat # SP-7056 lntennediate Shell Forging
* 20.0&deg;Fb)
Heat # [49D963/49C904] 1                  0.03          0.71                            -30 0
Lower Shell Forging
* 37.0&deg;F '
0.06          0.76        13.2&deg;Fc)            -30 Heat# [500102/50C97]-l-l Circumferential Weld *
(Intermediate Shell to Lower Shell)                                    41.opb>
Weld Seam WF-562                        0.03          0.67        26.lFc>              40 Heat# 442011 Circumferential Weld*
(Nozzle Shell to Intermediate Shell) 0.04          0.46        54.0&deg;phl            -25 Weld Seam WF-645 Heat#H4498
* Beltline Region Materials a) The Initial RTNOT values for the plates and welds are based on measured data.
b) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 1.1.
c) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 2.1 14
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT
                                                  .Table 5.3 Summary of Braidwood Unit 2 Adjusted Reference Temperature (ART) Values at l/4T and 3/4T Locations for 32 EFPv**>
Surface Fluence                      32EFPY Reactor Vessel Material (n/crn 2, E>l.O MeV)      l/4T ART (&deg;F)      3/4T ART (&deg;F) 19 Nozzle Shell Forging                        0 .559 x 10                66                    54 19 Intermediate Shell Forging                      1.73 x 10                  JO                  -I 19 Lower Shell Forging                        1.73 x 10                41                    24
-+Using non-credible surveillance data                1.73 x 10 19              -3                  -1 l Nozzle lo Intermediate Shell Forging Circ. Weld Seam                          0.559x 1019                51                    24 (Heat # H4498)
Intermediate to Lower Shell Forging Circ. Weld Seam                          1.67 x 1019              122                  99 (Heat# 442011)
  -+Using credible surveillance data                  1.67 x 10 19              92                  78 Notes:
(a)  The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14),
Tables 5.3.1-3 and 5.3. 1-4. The ART values summarized in this table utilize the most recent lluence projections and materials data, but were not used in development of the Prr limit curves.
See Figures 2.1 and 2.2 of this PTLR for the ART values used in development of the Pff limit curves.
15
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.4 Braidwood Unit 2 Calculation of Adjusted Reference Temperatures (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7056 Parameter                                        Values Operating Time                                      32 EFPY Location~ai                  l/4T ART (&deg;F)                3/4T ART(0 F)
Chemistry Factor, CF (&deg;F)                    26.0                          26.0 Fluence(f), n/cm..:
3.40xl0 18                    l.23xl018 (E>l.0 Mevib>
Fluence Factor, FF                      0.703                        0.460 ARTNor- CFxFF(&deg;F)                          18.3                          12.0 Initial RT NOT.* 1(&deg;F)                    30                            30 Marl?in, M(&deg;F)                        18.3                          12.0 ART= I+(CF*FF)+M, &deg;F 67                            54 per RO l.99, Revision 2 a) The Braidwood Unit 2 reactor vessel wall thickness is 8.5 inches at the beltline region.
18 b) Fluence, f, is the calculated peak clad/base metal interface fluencc (E>l.0 Mev) =5.67xl0 n/cm2 at 32 EFPY (Reference 11).
16
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.5 RTPTS Calculation for Braidwood Unit 2 Beltline Region Materials at EOL (32 EFPYia.b)
R.G.1.99,                                                IRTNDT<c)                        al<dl  Margin CF            Fluenee                                  4RTNDT      GuCc)                    RTPTS Reactor Vessel Material              Rev.2                                          FF (oF)      (nlcm1 , E>l.O MeV)                  (oF)        (of)      (OF)    (OF)      (Of)    (oF)
Position Nozzle Shell Forging                1.1        26          0.559 x 1019      0.8373        30        21.8        0    10.9      21.8      74 Intermediate Shell Forging              I.I        20            1.73 x 1019        1.1508      -30        23.0        0    11.5      23.0      16 19 Lower Shell Forging                  l.l        37            l.73x 10          1.1508        -30        42.6        0      17        34      47
-Using non-credible surveillance data          2.l      13.2          1.73 x 1019        1.1508      -30        15.2        0      7.6      15.2      0 Nozzle to Intermediate Shell Forging Circ. Weld Seam                1.1        54          0.559x 1019        0.8373        -25        45.2        0    22.6    45.2      65 (Heal # H4498)
Intermediate 10 Lower Shell Forging Circ. Weld Seam                1.1        41            1.67 x 1019        1.1413        40        46.8        0    23.4    46.8      134 (Heal # 442011)
  -Using credible surveillance data            2.1      26.l          1.67 x 1019        l.1413        40        29.8        0      14      28      98
  ~:
(a)  The 10 CFR 50.61 methodology was utilized in the calculation of the RT!"TS values.
(b)  The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14), Table 5.5-2.
(c)  Initial RTNOT values are based on measured data. Hence, Gu= 0&deg;F.
(d)  Per the guidance of 10 CFR 50.61, the base metal aA = 17&deg;F for Position 1.1 (without surveillance data) and for Position 2. 1 with non-credible surveillance data; the weld metal GA= 28&deg;F for Position I.I (without surveillance data) and with credible surveillance data GA= 14&deg;F for Position 2.1. However, a A need not exceed O.S*aRTNDT*
17
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 6.0    References
: 1. WCAP-14040-NP-A, Revision 2, "Methodology Used to Develop Cold Overpressure Mitigating System Setpoints and RCS Heatup and Cooldown Limit Curves", J.D.
Andrachek, et al., January 1996.
: 2. NRC Letter from R. A. Capra to O.D. Kingsley, Commonwealth Edison Company, "Byron Station Units 1 and 2 and Braidwood Station Units 1 and 2, Acceptance for referring of pressure temperature limits report, (M98799, M98800, M98801, and M98802)," January 21, 1998.
: 3. Westinghouse Letter to Exelon Nuclear, CAE-10-MUR-197, Revision 0, "Low Temperature Overpressure Protection (LTOP) System Evaluation Final Letter Report,"
M.P. Rudakewiz, September 8, 2010.
: 4. WCAP-11188, "Commonwealth Edison Company, Braidwood Station Unit 2 Reactor Vessel Surveillance Program," December 1986.
: 5. WCAP-15369, "Analysis of Capsule W from the Commonwealth Edison Company Braidwood Unit 2 Reactor Vessel Radiation Surveillance Program," March 2000.
: 6. WCAP-15381, "Evaluation of Pressurized Thermal Shock for Braidwood Unit 2", T.J.
Laubham, September 2000.
: 7. NRC Letter from G. F. Dick, Jr., NRR, to C. Crane, Exelon Generation Company, LLC, "Issuance of Amendments: Revised Pressure-Temperature Limits Methodology; Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2," dated October 4, 2004.
: 8. Byron & Braidwood Design Information Transmittal DIT-BRW-2006-0051, "Transmittal of Braidwood Unit l and Unit 2 Temperature and Pressure Uncertainties for Low Temperature Overpressure System (LTOPS) Power Operated Relief Valves (PORVS)," Nathan (Joe) Wolff Jr., July 18, 2006.
: 9. NRC Letter from M. Chawla to O.D. Kingsley, Exelon Generation Company, LLC, "Issuance of exemption from the Requirements of 10 CFR 50 Part 60 and Appendix G for Byron Station, Units 1 and 2, and Braidwood Stations, Units 1 and 2," dated August 8, 2001.
: 10. NRC Letter from R. F. Kuntz, NRR, to C. M. Crane, Exelon Generation Company, LLC, "Byron Station, Unit Nos. 1 and 2, and Braidwood Station, Unit Nos. 1 and 2 -
Issuance of Amendments Re: Reactor Coolant System Pressure and Temperature Limits Report (TAC Nos. MC8693, MC8694, MC8695, and MC8696)," November 27, 2006.
: 11. WCAP- 15373, Revision 2, "Braidwood Unit 2 Heatup and Cooldown Limits for Normal Operation," T.J. Laubham et al., November 2003.
18
 
BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT
: 12. WCAP-16143-P, Revision l, ..Reactor Vessel Closure Head/Vessel Flange Requirements Evaluation for Byron/Braidwood Units 1 and 2," W. Bamford, et al.,
October 2014.
: 13. Westinghouse Letter to Exelon Nuclear, CCE-07-24, ..Braidwood Unit 1and2 RCS HU/CD Limit Curve Table Values," dated February 15, 2007.
: 14. Westinghouse Calculation Note CN-AMLRS-10-7, Revision O. "Braidwood Units I and 2 Measurement Uncertainty Recapture (MURJ Uprate: Reactor Vessel Integrity Evaluations." A.E. Leicht, September 2010, and Westinghouse evaluation MCOE-LTR-13-102 Rev. 0, ..Byron and Braidwood Closure Head/Vessel Flange Region: MUR Uprate Assessment," November 2013.
l9}}

Latest revision as of 06:58, 5 February 2020

Submittal of Pressure and Temperature Limits Reports (Ptlrs), Revision 8 and Braidwood, Unit 2 - Pressure and Temperature Limits Reports (Ptlrs), Revision 7
ML15344A159
Person / Time
Site: Braidwood  Constellation icon.png
Issue date: 12/10/2015
From: Marchionda M
Exelon Generation Co
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
BW150112
Download: ML15344A159 (49)
v • d • e


Text

Exelon Gonorotion Company, LLC Brmdwood Station Exelon Generation< 35100 South Route 53, Suito 64 Bracovitlo, IL 60401*9619 December 10, 2015 BW150112 U.S. Nuclear Regulatory Commission ATIN: Document Control Desk Washington, DC 20555-0001 Braidwood Station, Units 1 and 2 Facility Operating License Nos. NPF-72 and NPF-77 NRC Docket Nos. STN 50-456 and 50-457

Subject:

Braidwood Unit 1 - Pressure and Temperature Limits Reports (PTLRs), Revision 8 Braidwood Unit 2 - Pressure and Temperature Limits Reports (PTLRs), Revision 7

Reference:

Letter from U.S. NRC to B.C. Hanson (Exelon Generation Company, LLC),

"Issuance of Amendments to Utilize WCAP-16143-P, Revision 1, "Reactor Vessel Closure HeadNessel Flange Requirements Evaluation for Byron/Braidwood Units 1 and 2," dated October 16, 2014," dated October 28, 2015 The purpose of this letter is to transmit the Pressure and Temperature Limits Reports (PTLRs) for Braidwood Station, Units 1 and 2 in accordance with Technical Specification (TS) 5.6.6, "Reactor Coolant System (RCS) Pressure and Temperature Limits Report (PTLR)."

The Braidwood Unit 1 and Unit 2 PTLRs were revised to update the reference to WCAP-16143-P, "Reactor Vessel Closure HeadNessel Flange Requirements Evaluation for Byron/Braidwood Units 1 and 2," from Revision Oto Revision 1 for consistency with the referenced Technical Specification Amendment.

Please direct any questions you may have regarding this matter to Mr. Phillip Raush, Regulatory Assurance Manager, at (815) 417-2800.

Marri Ma hionda-Palmer Site Vice resident Braidwood Station Attachments: 1. Braidwood Unit 1 Pressure Temperature Limits Report (PTLR), Revision 8 2 Braidwood Unit 2 Pressure Temperature Limits Report (PTLR), Revision 7

ATTACHMENT 1 Braidwood Unit 1 Pressure and Temperature Limits Report (PTLR), Revision 8

BRAIDWOOD UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT (PTLR)

Revision 8

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table of Contents Section Page l .O Introduction 2.0 RCS Pressure and Temperature Limits L 2.1 RCS Pressure and Temperature (Pff) Limits (LCO 3.4.3) 1 3.0 Low Temperature Over Pressure Protection and Boltup 7 3.1 LTOP System Setpoints (LCO 3.4.12) 7 3.2 LTOP Enable Temperature 7 3.3 Reactor Vessel Boltup Temperature (Non-Technical Specification) 7 4.0 Reactor Vessel Material Surveillance Program 10 5.0 Supplemental Data Tables 12 6.0 References 18

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT List of Figures Figure Page 2.1 Braidwood Unit 1 Reactor Coolant System Heatup Limitations (Heatup 3 Rate of 100°F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 2.2 Braidwood Unit 1 Reactor Coolant System Cooldown Limitations 4 (Cooldown Rates of 0, 25, 50, and l00°F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors)

3. 1 Braidwood Unit 1 Nominal PORV Setpoints for the Low Temperature 8 Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) ii

BRAIDWOOD

  • UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT List of Tables Table Page 2.la Braidwood Unit l Heatup Data Points at 32 EFPY (Without 5 Margins for Instrumentation Errors) 2.lb Braidwood Unit 1 Cooldown Data Points at 32 EFPY (Without 6 Margins for Instrumentation Errors) 3.1 Data Points for Braidwood Unit l Nominal PORV Setpoints for 9 the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) 4.1 Braidwood Unit l Surveillance Capsule Withdrawal Summary 11 5.1 Braidwood Unit l Calculation of Chemistry Factors Using 13 Surveillance Capsule Data 5.2 Braidwood Unit 1 Reactor Vessel Material Properties 14 5.3 Summary of Braidwood Unit 1 Adjusted Reference Temperature 15 (ART) Values at 1/4T and 3/4T Locations for 32 EFPY 5.4 Braidwood Unit 1 Calculation of Adjusted Reference 16 Temperatures (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7016 5.5 RTPTs Calculation for Braidwood Unit 1 Beltline Region 17 Materials at EOL (32 EFPY) iii

BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 1.0 Introduction This Pressure and Temperature Limits Report (PTLR) for Braidwood Unit 1 has been prepared in accordance with the requirements of Braidwood Technical Specification (TS) 5.6.6, "Reactor Coolant System (RCS) Pressure and Temperature Limits Report (PTLR)".

Revisions to the PTLR shall be provided to the NRC after issuance.

The Technical Specifications (TS) addressed in this report are listed below:

LCO 3.4.3 RCS Pressure and Temperature (Pff) Limits; and LCO 3.4.12 Low Temperature Overpressure Protection (LTOP) System.

2.0 RCS Pressure and Temperature Limits The PTLR limits for Braidwood Unit l were developed using a methodology specified in the Technical Specifications. The methodology listed in WCAP-14040-NP-A, Revision 2 (Reference 1) was used with the following exceptions:

a) Optional use of ASME Code Section XI, Appendix G, Article G-2000, 1996 Addenda, b) Use of ASME Code Case N-640, ..Alternative Reference Fracture Toughness for Development of P-T Limit Curves,Section XI, Di vision I",

c) Use of ASME Code Case N-588, "Alternative to Reference Flaw Orientation of Appendix G for Circumferential Welds in Reactor Vessel,Section XI, Division l ",

and d) Elimination of the flange requirements documented in WCAP-16143-P.

These exceptions to the methodology in WCAP 14040-NP-A, Revision 2 have been reviewed and accepted by the NRC in References 2, 8, 9 and I 0.

WCAP 15364, Revision 2 (Reference 11), provides the basis for the Braidwood Unit l Pff curves, along with the best estimate chemical compositions, fluence projections and adjusted reference temperatures used to determine these limits. WCAP-16143-P, Reference 12, documents the technical basis for the elimination of the flange requirements.

2.1 RCS Pressure and Temperature (Pff) Limits (LCO 3.4.3) 2.1.1 The RCS temperature rate-of-change limits defined in WCAP-15364, Revision 2 (Reference 11) are:

a A maximum heatup of 100°F in any 1-hour period,

b. A maximum cooldown of 100°F in any I-hour period, and

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT

c. A maximum temperature change of less than or equal to l0°F in any I-hour period during inservice hydrostatic and leak testing operations above the heatup and cooldown limit curves.
2. 1.2 The RCS Pff limits for heatup, inservice hydrostatic and leak testing, and criticality are specified by Figure 2.1 and Table 2. la. The RCS Pff limits for cooldown are shown in Figure 2.2 and Table 2. lb. These limits are defined in WCAP-15364, Revision 2 (Reference 11). Consistent with the methodology described in Reference 1 and exceptions noted in Section 2.0, the RCS Pff limits for heatup and cooldown shown in Figures 2.1 and 2.2 are provided without margins for instrument error. These limits were developed using ASME Boiler and Pressure Vessel Code Section XI, Appendix G, Article G2000, 1996 Addenda.

The criticality limit curve specifies pressure-temperature limits for core operation to provide additional margin during actual power production as specified in 10 CFR 50, Appendix G.

The Pff limits for core operation (except for low power physics testing) are that the reactor vessel must be at a temperature equal to or higher than the minimum temperature required for the inservice hydrostatic test, and at least 40°F higher than the minimum pennissible temperature in the corresponding Pff curve for heatup and cooldown.

2

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT MATERIAL PROPERTY BASIS '

LIMITING MATERIAL: NO:ZZLE SHELL FORGING SP-7016 LIMITING ART VALUES AT 32 EFPY: l/4T, 48°F 3/4T, 35°F 2500 *.

r

Leak Test Limit I OpeMlm Verslon
5.1 Run:29844 2250 .

j Acceptable 2000 . Operation Unacceptable Operation j j

-us 1750 C!J c.

1500 *I- Heatup Rate 100 Deg. F/Hr I II~ L--"'

Critical Limit 100 Deg. F/Hr

~

Cl)

J fl) fl) )

! 1250 ..

c. ,_-! ,./

'ti

! 1000

J u .

"i Crltlcallty Limit based on 0 750 . lnaervlce hydrostatic test

~ temperature (1 OS'F) for the service period up to 32 EFPY 500 Boltup I~

Temp 250 .

0 ..

IThe lower llmlt for RCS 1 pressure lso psla

~

n 0 50 100 150 200 250 300 350 400 450 500 550 Moderator Temperature (Deg. F)

Figure 2.1 Braidwood Unit 1 Reactor Coolant System Heatup Limitations (Heatup Rate of 100°F/hr)

Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 3

BRAIDWOOD

Unacceptable Operation Acceptable 2000 ~

Operation CJ 1750 .

ii5 a.

Q)

J fl) 1500 . J fl) 1250 ..

Q)

a. .

/1 Cooldown Rates 1ca 1000 .

(°F/Hr) steady.state,

'3 -25, u -50, and

'ii -100 0 750 500 .

. I 250

- I Boltup Temp. I 0 ~

IJ!he lower llmlt for RCS I

pressure la Opsla I I

0 50 100 150 200 250 300 350 400 450 500 550 Moderator Temperature (Deg. F)

Figure 2.2 Braidwood Unit 1 Reactor Coolant System Cooldown Limitations (Cooldown Rates of 0, 25, 50 and 100°F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 4

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.la Braidwood Unit 1 Heatup Data Points at 32 EFPY (Without Margins for Instrumentation Errors)

Heatup Curve 100 F Heatup Criticality Leak Test Limit Limit T (°F) P <osie:) T(°F) P (osi2) T<°F) P (osi iz) 60 Note I 108 Note I 91 2000 60 1064 108 1114 108 2485 65 1114 I to 1166 70 1166 115 1172 75 1172 120 1176 80 1176 125 1188 85 1188 130 1207 90 1207 135 1234 95 1234 140 1267 100 1267 145 1308 105 1308 150 1357 110 1357 155 1414 115 1414 160 1479 120 1479 165 1554 125 1554 170 1638 130 1638 175 1732 135 1732 180 1838 140 1838 185 1956 145 1956 190 2088 150 2088 195 2235 155 2235 200 2397 160 2397 Note l :The Minimum acceptable pressure is 0 psi a

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.lb Braidwood Unit 1 Cooldown Data Points at 32 EFPY (Without Margins for Instrumentation Errors)

Cooldown Curves Sleady Stale 25 °F Cooldown 50 °F Cooldown 100 °F Cooldown T (°F) P (psig) T(°F) P (psig) T (°F) P (psig) T (°F) P (psig) 60 Note 1 60 Note I 60 Note I 60 Note I 60 1082 60 1078 60 l078* 60 1078*

65 1133 65 1133 65 1133 65 1133 70 1188 70 t 188 70 1188 70 1188 75 1250 75 1250 75 1250 75 1250 80 1318 80 1318 80 1318 80 1318 85 1393 85 1393 85 1393 85 1393 90 1476 90 1476 90 1476 90 1476 95 1568 95 1568 95 1568 95 1568 100 1669 JOO 1669 100 1669 JOO 1669 105 1781 105 1781 105 1781 105 1781 110 1905 110 1905 110 1905 110 1905 115 2042 115 2042 115 2042 115 2042 120 2194 120 2194 120 2194 120 2194 125 2361 125 2361 125 2361 125 2361

  • Refer to Reference 13 Note 1:The Minimum acceptable pressure is 0 psia 6

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 3.0 Low Temperature Overpressure Protection and Boltup This section provides the Braidwood Unit 1 power opemted relief valve lift settings, low temperature overpressure protection (LTOP) system arming temperature, and minimum reactor vessel boltup temperature.

3.1 LTOP System Setpoints (LCO 3.4.12)

The power operated relief valves (PORVs) shall each have maximum lift settings in accordance with Figure 3.1 and Table 3. l. These limits are based on References 3 and 4.

The LTOP setpoints are based on Pff limits which were established in accordance with 10 CFR 50, Appendix G without allowance for instrumentation error and in accordance with the methodology described in Reference l. The LTOP PORV nominal lift settings shown in Figure 3.1 and Table 3. 1 account for appropriate instrument error.

3.2 LTOP Enable Temperature Braidwood Unit 1 procedures governing the heatup and cooldown of the RCS require the arming of the LTOP System for RCS temperature of 350°F and below and disarming of LTOP for RCS temperature above 350°F.

Note that the last LTOP PORV segment in Table 3.1 extends to 400°F where the pressure setpoint is 2335 psig. This is intended to prohibit PORV lift for an inadvertent LTOP system arming at power.

3.3 Reactor Vessel Boltup Temperature (Non-Technical Specification)

The minimum boltup temperature for the Reactor Vessel Flange shall be~ 60°F. Boltup is a condition in which the Reactor Vessel head is installed with tension applied to any stud, and with the RCS vented to atmosphere.

7

BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT I 2335ps1g 2250 2000 I

_ 1750 I S!

~

! 1500 I I

a. 1250 Unacceplable Operation I

I IC 2

.. 1000

  • ec

~

750 595 pslg PCV-456 i

I II I

500 541 pslg

" ' PCV-455A 0

0 mo 150 200 250 300 350 Auctlaneenid Low RCS Temperaluni (DEG. F)

Figure 3.1 Braidwood Unit 1 Nominal PORV Setpoints for the Low Temperature Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) 8

BRAIDWOOD-UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 3.1 Data Points for Braidwood Unit 1 Nominal PORV Setpoints for the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)

PCV-455A PCV-456 (ITY-0413M) (ITY-0413P)

AUCTIONEERED LOW RCS PRESSURE AUCTIONEERED LOW RCS PRESSURE RCS TEMP. (DEG. F) (PSIG) RCS TEMP. (DEG. F) (PSIG) 60 541 60 595 300 541 300 595 400 2335 400 2335 Note: To determine nominal lift setpoints for RCS Pressure and RCS Temperatures greater than 300°F, linearly interpolate between the 300°F and 400°F data points shown above. (Setpoints extend to 400°F to prevent PORV liftoff from an inadvertent LTOP system arming while at power.)

9

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 4.0 Reactor Vessel Material Surveillance Program The pressure vessel material surveillance program (Reference 5) is in compliance with Appendix H to 10 CFR 50, "Reactor Vessel Radiation Surveillance Program." The material test requirements and the acceptance standard utilize the reference nil-ductility temperature, RTNDT, which is determined in accordance with ASME Boiler and Pressure Vessel Code Section III, NB-2331. The empirical relationship between RTNoT and the fracture toughness of the reactor vessel steel is developed in accordance with Appendix G, "Protection Against Non-Ductile Failure," to Section XI of the ASME Boiler and Pressure Vessel Code. The surveillance capsule removal schedule meets the requirements of ASTM El85-82.

The third and final reactor vessel material irradiation surveillance specimens (Capsule W) have been removed and analyzed to determine changes in material properties. The surveillance capsule testing has been completed for the original operating period. The remaining three capsules, V, Y, and Z, were removed and placed in the spent fuel pool to avoid excessive fluence accumulation should they be needed to support life extension.

The removal summary is provided in Table 4.1.

10

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT

.Table 4.1 Braidwood Unit 1 Capsule Withdrawal Summary(*)

Capsule Fluence Capsule Lead Factor Withdrawal EFPY

Location (n/cm2, E>l.O MeV) u 58.5° 4.02 1.16 0.388 x 10 19 x 238.5° 4.06 4.30 1.17 x 10 19 w 121.5° 4.05 7.79 l.98 x 1019 z<c) 301.5° 4.09 12.01 (EOC 10) 2.79 x 10 19 y(c) 61.0° 3.92 17.69 (EOC 14) 3.71 x 10 19 y<c) 241.0° 3.81 12.01 (EOC 10) 2.60 x 1019 Notes:

(a) Source document is CN-AMLRS-I0-7 (Reference 14), Table 5.7-3.

(b) Effective Full Power Years (EFPY) from plant startup.

(c) Standby Capsules Z, V, and Y were removed and placed in the spent fuel pool. No testing or analysis has been performed on these capsules. If license renewal is sought, one of these standby capsules may nt!ed to be tested to determine the effect of neutron irradiation on the reactor vessel surveillance materials during the period of ex1ended operation.

ll

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 5.0 Supplemental Data Tables The foJlowing tables provide supplemental information on reactor vessel material properties and are provided to be consistent with Generic Letter 96-03. Some of the material property values shown were used as inputs to the Pff limits.

Table 5.1 shows the calculation of the surveillance material chemistry factors using surveillance capsule data.

Table 5.2 provides the reactor vessel material properties table.

Table 5.3 provides a summary of the Braidwood Unit I adjusted reference temperature (ART) values at the l/4T and 3/4T locations for 32 EFPY.

Table 5.4 shows the calculation of ARTs at 32 EFPY for the limiting Braidwood Unit I reactor vessel material, i.e. weld WF-562 ( HT # 442011, Based on Surveillance Capsules U and X Data).

Table 5.5 provides the RTns calculation for Braidwood Unit 1 Beltline Region Materials at EOL (32 EFPY), (Reference 7).

12

BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.1 Braidwood Unit 1 Calculation of Chemistry Factors Using Surveillance Capsule Data<11 >

Capsule f<bl .1.RTNllTlbl FP.1.RTNDT Material Capsule FF<c1 FF2 (n/cm2, E > 1.0 MeV) (oF) (oF) u 0.388 x 1019 0.738 5.78 4.26 0.54 Lower Shell Forging x 1.17 x 10 19 1.044 38.23 39.91 1.09 (Tangential) w 1.98 x 1019 1.186 24.14 28.64 1.41 u 0.388 x 10 19 0.738 o.01d1 0.00 0.54 Lower Shell Forging x 1.17 x 10 19 1.044 28.75 30.01 1.09 (Axial) w 1.98 x 1019 1.186 37. 11 44.03 1.41 SUM: 146.85 6.08 CF LSForJini =L(FF *.1.RTNoT) + L(FF2) =(146.85) + (6.08) =24.1°F u 0.388 x 1019 0.738 17.06 12.59 0.54 Braidwood Unit 1 Surveillance Weld x 1.17 x 1019 1.044 30.15 31.47 1.09 Material w 1.98 x 10 19 1.186 49.68 58.94 1.41 Braidwood Unit 2 u 0.388 x 1019 0.738 o.o<d> 0.00 0.54 Surveillance Weld x 1.15 x 10 19 1.039 26.3 27.33 1.08 Material w 2.07 x 10 19 1.198 23.9 28.63 1.44 SUM: 158.96 6.10 CF Wckll'.lcw =L(FF "'ARTNoT) + L(FF ) =(158.96) + (6.10) =26.l°F 2

~:

(a) Source document is CN-AMLRS-10-7 (Reference 14), Table 5.2-1.

(b) f = fluence; .1.RTNOT values are the measured 30 ft-lb shift values taken from Reference 6.

(c) =

FF fluence factor =r 0*28

  • o.io*1og I)

(d) Measured ARTNm values were determined to be negative, but physically a reduction should not occur; therefore, conservative values of zero are used.

IJ

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.2

.Braidwood Unit 1 Reactor Vessel Material Properties Chemistry Initial Material Description Cu(%) Ni(%)

Factor RT NOT {°F)(a)

Closure Head Flange Heat# 5P738 l/3P6406 0.1 l 0.67 -- -20 Vessel Flange Heat # 122N357V -- 0.77 -- -10 Nozzle Shell Forging

  • 26.0°Pb>

0.04 0.73 10 Heat# 5P-7016 Intermediate Shell Forging

  • 0.05 0.73 3 l .0°Pb> -30 Heat # [49D383/49C344)-1-1 0

Lower Shell Forging

  • 31.0°F '

0.05 0.74 24.l ope> -20 Heat# [49D867/49C813]-l-l Circumferential Weld* 4l.0°Pb>

(Intermediate Shell to Lower Shell) 0.03 0.67 26.1 ope> 40 WF-562 (HT# 442011)

Upper Circumferential Weld*

(Nozzle Shell to Intermediate Shell) 0.04 0.46 54.oopbl -25 WF-645 (HT# H4498)

  • Beltline Region Materials a) The Initial RTNoTvalues for the plates and welds are based on measured data.

b) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 1.1.

c) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 2.1.

14

BRAIDWOOD

.Table 5.3 Summary of Braidwood Unit 1 Adjusted Reference Temperature (ART) Values at l/4T and 3/4T Locations for 32 EFPv1*>

32 EFPY Surface Flucncc Reactor Vcssel Material 1/4TART 3/4TART (n/cm2, E>l.O McV)

(OF) (oF)

Nozzle Shell Forging 0.586 lt 1019 47 34 19 Intermediate Shell Forging 1.76 x 10 33 15 Lower Shell Forging 1.76 x 10 19 43 25

-.Using credible surveillance data 1.76 x 10 19 21 15 Nozzle to Intermediate Shell Forging Circ. Weld Seam 0 .586x 1019 52 25 (Heat # H4498)

Intermediate to Lower Shell Forging Circ. Weld Seam 1.70 x 10 19 122 99 (Heat# 442011)

-Using credible surveillance data 1.70 x 1019 93 78

~:

(a) The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14),

Tables 5.3. 1-1 and 5.3.1-2. The ART values summarized in this table utilize the most recent fluence projections and materials data, but were not used in development of the Pff limit curves. See Figures 2.1 and 2.2 of this PTLR for the ART values used in development of the Pff limit curves.

15

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT

.Table 5.4 Braidwood Unit 1 Calculation of Adjusted Reference Temperatures (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7016 Parameter Values Operating Time 32 EFPY Locationtai l/4T ART(°F) 3/4T ART(°F)

Chemistry Factor, CF (°F) 26.0 26.0 Fluence(t), n/cml 3.65 x 1018 l.32 xl0 18 (E> 1.0 Mev)

Fluence Factor, FF 0.772 0.475 i1RTNor= CFxFF(°F) 18.8 12.4 Initial RT Nor.* 1(°F) 10 10 Margin, M (°F) 18.8 12.4 ART= I+(CF*FF)+M,°F 48 35 per RG 1.99, Revision 2 (a) The Braidwood Unit I reactor vessel wall thickness is 8.5 inches at the beltline region.

(b) Flucnce r, is based upon f,wf (E > 1.0 Mev) = 6.08 x 1018 at 32 EFPY (Reference 11).

l6

BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.5 RTPTS Calculation for Braidwood Unit 1 Beltline Region Materials at EOL (32 EFPYi*,h>

(c R.G.1.99, IRTNDT Cfu<c> CfJ.(d) Margin CF Fluence I .ARTNDT RTFrS Reactor Vessel Material Rev.2 (oF) (n/cm2, E>l.O MeV)

FF (oF) (Of) {of) (oF) (Of)

Position (OF)

Nozzle Shell Forging 1.1 26 0.586 x 1019 0.8504 10 22. l 0 l l.l 22.l 54 Intennediate Shell Forging l.l 31 1.76 x 10 19 1.1554 -30 35.8 0 17 34 40 Lower Shell Forging 1.1 31 1.76 x 1019 1.1554 -20 35.8 0 17 34 50

-+Using credible surveillance data 2.1 24.l l.76x 1019 l.l554 -20 27.8 0 8.5 17 25 Nozzle to Intermediate Shell Forging Circ. Weld Seam I.I 54 0.586x 10 19 0.8504 -25 45.9 0 23.0 45.9 67 (Heat # H4498)

Intermediate to Lower Shell Forging Circ. Weld Seam I.I 41 1.70 x 1019 1.1461 40 47.0 0 23.5 47.0 134 (Heat# 442011)

-+Using credible surveillance data 2. 1 26.l 1.70 x 1019 1.1461 40 29.9 0 14 28 98 Notes:

(a) The 10 CFR 50.61 methodology was uti.lized in the calculation of the RTPTS values.

(b) The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14), Table 5.5-l.

(c) Initial RTNDT values are based on measured data. Hence, Gu= 0°F.

=

(d) Per the guidance of 10 CFR 50.61, the base metal a11 l 7°F for Position 1.1 (without surveillance data) and with credible surveillance data a4 = 8.5°F for Position 2.1; the weld metal a 4 =28°F for Position I.I (without surveillance data) and with credible surveillance data cr4 =

14°F for Position 2.1. However, cr4 need not exceed 0.5*.6.RTNDT*

17

BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 6.0 References

1. WCAP-14040-NP-A, Revision 2, "Methodology Used to Develop Cold Overpressure Mitigating System Setpoints and RCS Heatup and Cooldown Limit Curves," J.D. Andrachek, et al., January 1996.
2. NRC Letter from R. A. Capra to O.D. Kingsley, Commonwealth Edison Company, "Byron Station Units 1 and 2 and Braidwood Station Units 1 and 2, Acceptance for referring of pressure temperature limits report, (M98799, M98800, M98801, and M98802)," January 21 1998.
3. Westinghouse Letter to Exelon Nuclear, CAE-10-MUR-197, Revision 0, "Low Temperature Overpressure Protection (LTOP) System Evaluation Final Letter Report," M.P. Rudakewiz, September 8, 2010.
4. Byron & Braidwood Design Information Transmittal DIT-BRW-2006-0051, "Transmittal of Braidwood Unit 1 and Unit 2 Temperature and Pressure Uncertainties for Low Temperature Overpressure System (LTOPS) Power Operated Relief Valves (PORVS)," Nathan (Joe)

Wolff Jr., July 18, 2006.

5. WCAP-9807, "Commonwealth Edison Company, Braidwood Station Unit 1 Reactor Vessel Radiation Surveillance Program," S.E. Yanichko, et al., February 1981.
6. WCAP-15316, Revision l, "Analysis of Capsule W from Commonwealth Edison Company Braidwood Unit l Reactor Vessel Radiation Surveillance Program," E. Terek, et al.,

December 1999.

7. WCAP-15365, Revision l, "Evaluation of Pressurized Thermal Shock for Braidwood Unit l," J.H. Ledger, January 2002.
8. NRC Letter from G. F. Dick, Jr., NRR, to C. Crane, Exelon Generation Company, LLC, "Issuance of Amendments: Revised Pressure-Temperature Limits Methodology; Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2," dated October 4, 2004.
9. NRC Letter from M. Chawla to O.D. Kingsley, Exelon Generation Company, LLC, "Issuance of exemption from the Requirements of 10 CFR 50 Part 60 and Appendix G for Byron Station, Units l and 2, and Braidwood Stations, Units 1 and 2," dated August 8, 200 l .
10. NRC Letter from R. F. Kuntz, NRR, to C. M. Crane, Exelon Generation Company, LLC, "Byron Station, Unit Nos. 1 and 2, and Braidwood Station, Unit Nos. 1 and 2- Issuance of Amendments Re: Reactor Coolant System Pressure and Temperature Limits Report (TAC Nos. MC8693, MC8694, MC8695, and MC8696)," November 27, 2006.

18

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT

11. WCAP-15364, Revision 2, "Braidwood Unit 1 Heatup and Cooldown Limit Curves for Normal Operation," T.J. Laubham, November 2003.
12. WCAP-16143-P, Revision I, "Reactor Vessel Closure Head/Vessel Flange Requirements Evaluation for Byron/Braidwood Units I and 2," W. Bamford, et al., October 2014.
13. Westinghouse Letter to Exelon Nuclear, CCE-07-24, "Braidwood Unit I and 2 RCS HU/CD Limit Curve Table Values," dated February 15, 2007.
14. Westinghouse Calculation Note CN-AMLRS-10-7, Revision 0, "Braidwood Units 1 and:?

Measurement Uncc11ainty Recapture (MUR) Uprate: Reactor Vessel Integrity Evaluations,"

A.E. Leicht. September 2010.

19

ATTACHMENT 2 Braidwood Unit 2 Pressure and Temperature Limits Report (PTLR), Revision 7

BRAIDWOOD UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT (PTLR)

Revision 7

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table of Contents Section Page 1.0 Introduction 1 2.0 RCS Pressure Temperature Limits 2.1 RCS Pressure and Temperature (P/f) Limits (LCO 3.4.3) 3.0 Low Temperature Over Pressure Protection and Boltup 7 3.1 LTOP System Setpoints (LCO 3.4.12) 7 3.2 LTOP Enable Temperature 7 3.3 Reactor Vessel Boltup Temperature (Non-Technical Specification) 7 4.0 Reactor Vessel Material Surveillance Program 10 5.0 Supplemental Data Tables 12 6.0 References 18

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATORE LIMITS REPORT List of Figures Figure Page 2.1 Braidwood Unit 2 Reactor Coolant System Heatup Limitations 3 (Heatup Rate of l 00°F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 2.2 Braidwood Unit 2 Reactor Coolant System Cooldown Limitations 4 (Cooldown Rates of 0, 25, 50 and 100°F/hr) Applicable to 32 EFPY (Without Margins for Instrumentation Errors) 3.1 Braidwood Unit 2 Nominal PORV Setpoints for the Low Temperature 8 Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)

BRAIDWOOD .. UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT List of Tables Table Page

2. la Braidwood Unit 2 Heatup Data at 32 EFPY (Without 5 Margins for Instrumentation Errors)
2. lb Braidwood Unit 2 Cooldown Data Points 32 EFPY (Without 6 Margins for lnstrumentation Errors)
3. l Data Points for Braidwood Unit 2 Nominal PORV 9 Setpoints for the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)
4. 1 Braidwood Unit 2 Capsule Withdrawal Summary 11 5.1 Braidwood Unit 2 Calculation of Chemistry Factors Using 13 Surveillance Capsule Data 5.2 Braidwood Unit 2 Reactor Vessel Material Properties 14 5.3 Summary of Braidwood Unit 2 Adjusted Reference 15 Temperature (ART) Values at l/4T and 3/4T Locations for 32 EFPY 5.4 Braidwood Unit 2 Calculation of Adjusted Reference 16 Temperature (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7056 5.5 RTPTS Calculation for Braidwood Unit 2 Beltline Region 17 Materials at EOL (32 EFPY)

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 1.0 Introduction This Pressure and Temperature Limits Report (PTLR) for Braidwood Unit 2 has been prepared in accordance with the requirements of Braidwood Technical Specification (TS) 5.6.6, "Reactor Coolant System (RCS) Pressure and Temperature Limits Report (PTLR)". Revisions to the PTLR shall be provided to the NRC after issuance.

The Technical Specifications addressed in this report are listed below:

LCO 3.4.3 RCS Pressure and Temperature (Pff) Limits; and LCO 3.4.12 Low Temperature Overpressure Protection (LTOP) System.

2.0 RCS Pressure Temperature Limits The PTLR limits for Braidwood Unit 2 were developed using a methodology specified in the Technical Specifications. The methodology listed in WCAP-14040-NP-A, Revision 2 (Reference I) was used with the following exception:

a) Optional use of ASME Code Section XI, Appendix G, Article G-2000, 1996 Addenda, b) Use of ASME Code Case N-640, "Alternative Reference Fracture Toughness for Development of P-T Limit Curves,Section XI, Division l", and c) Use of ASME Code Case N-588, "Alternative to Reference Flaw Orientation of Appendix G for Circumferential Welds in Reactor Vessel,Section XI, Division 1", and d) Elimination of the flange requirements documented in WCAP-16143-P.

This exception to the methodology in WCAP 14040-NP-A, Revision 2 has been reviewed and accepted by the NRC in References 2, 7, 9, and 10.

WCAP 15373, Revision 2 (Reference 11), provides the basis for the Braidwood Unit 2 Pff curves, along with the best estimate chemical compositions, fluence projections and adjusted reference temperatures used to detennine these limits.

WCAP-16143-P, Reference 12, documents the technical basis for the elimination of the flange requirements.

2.1 RCS Pressure and Temperature (Pff) Limits (LCO 3.4.3) 2.1. l The RCS temperature rate-of-change limits defined in Reference 11 are:

a. A maximum heatup of 100°F in any I-hour period.
b. A maximum cooldown of 100°F in any I-hour period, and 1

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT .

c. A maximum temperature change of less than or equal to l0°F in any I-hour period during inservice hydrostatic and leak testing operations above the heatup and cooldown limit curves.

2.1.2 The RCS Pff limiL'i for heatup, inservice hydrostatic and leak testing, and criticality are specified by Figure 2.1 and Table 2.1 a. The RCS Pff limits for cooldown are shown in Figure 2.2 and Table 2.1 b. These limits are defined in WCAP-15373, Revision 2 (Reference 11). Consistent with the methodology described in Reference l, with the exception noted in Section 2.0, the RCS Pff limits for heatup and cooldown shown in Figures 2.1 and 2.2 are provided without margins for instrument error. These limits were developed using ASME Boiler and Pressure Vessel Code Section XI, Appendix G, Article G2000, 1996 Addenda. The criticality limit curve specifies pressure-temperature limits for core operation to provide additional margin during actual power production as specified in LO CFR 50, Appendix G.

The Pff limits for core operation (except for low power physics testing) are that the reactor vessel must be at a temperature equal to or higher than the minimum temperature required for the inservice hydrostatic test, and at least 40°F higher than the minimum permissible temperature in the corresponding Pff curve for heatup and cooldown.

2

BRAIDWOOD* UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Material Proocrty Basis Limiting Material: Circumferential Weld WF-562 & Nozzle Shell Forging Limiting ART Values at 32 EFPY l/4T 93°F (N-588) & 67°F ('96 App. G) 3/4T 79°F (N-588) & 54°F ('96 App. G) 2500 *.

2250

,' Leak Test Limit IOper1im Verslon:5.1 Aun: 19017

. j Acceptable 2000 Operation Unacceptable

  • - Operation J

- 1750 I )

CJ Ci)

-... --.. . . . . IJ tI CL 1500 .

CD 1DO Deg. F/Hr r- Crltlcal Limit 100 Deg. F/Hr

~

1250 .

U)

U)

CL

...CD .

_V ~

"Cl CD 1000 . ,..- ...

~

u ca 750 Crltlcallty Limit b ased on lnservlca hydrostatic test 0 -

, temperature (127"F) for the service period up to 32 EFPY 500 .

Boltup Temp 250

!The lower llmlt for RCS 0 ,_ .....- o 1presaura Is psla 0 50 100 150 200 250 300 350 400 450 500 550 Moderator Temperature (Deg. F)

Figure 2.1 Braidwood Unit 2 Reactor Coolant System Heatup Limitations (Heatup Rate of 100°F/hr)

Applicable to 32 EFPY (Without Margins for Instrumentation Errors) 3

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Material Property Basis Limiting Malerial: Circumferential Weld WF-562 & Nozzle Shell Forging Limiting ART Values at 32 EFPY 1/4T 93°F (N-588) & 67°F ('96 App. G) 3/4T 79°F (N-588) & 54°F ('96 App. G) 2500 Oper11m Version:5.1 Run:19017 I f

2250 -

. Unacceptable Operation Acceptable 2000 Operation

- 1750 J CJ Ci5 a.

u 1500 - I

~

,,,en J I

! 1250 -

,Ii a.

"C u

m 1000

~

u

'ii Cooldown Rates

(°F/Hr) steady-state,

  • 25, 0 *50, and 750 *100 500 I

250 I

Boltup Temp. I LJ;rh* lower limit for RCS I

0 - - -

I pressure lso psla I

0 50 100 150 200 250 300 350 400 450 500 550 Moderator Temperature (Deg. F)

Figure 2.2 Braidwood Unit 2 Reactor Coolant System Cooldown Limitations (Cooldown Rates of O, 25, 50 and 100°F/hr) Applicable to 32 EFPY (Without Margins of Instrumentation Errors) 4

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.la Braidwood Unit 2 Heatup Data Points at 32 EFPY (Without Margins for Instrumentation Errors)

Heatup Curve 100 F Heatup Criticality Limit Leak Test Limit T (°F) P (psig) T (°F) P (psig) T ("F) P (psig) 60 Note I 127 Note I 110 2000 60 924 127 965 127 2485 65 965 127 977*

70 977 127 977 75 977 127 981 80 977 130 990 85 981 135 1005 90 990 140 1025 95 1005 145 1051 100 1025 150 1081 105 1051 155 1118 110 1081 160 1161 115 1118 165 1210 120 1161 170 1266 125 1210 175 1329 130 1266 180 1400 135 1329 185 1480 140 1400 190 1569 145 1480 195 1668 150 1569 200 1778 155 1668 205 1901 160 1778 210 2036 165 1901 215 2186 170 2036 220 2353 175 2186 180 2353

  • Refer to Reference l3 Note 1: The Minimum acceptable pressure is 0 psia 5

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.lb Braidwood Unit 2 Cooldown Data at 32 EFPY (Without Margins for Instrumentation Errors)

Cooldown Curves Steady State 25 °F Cooldown 50 °F Cooldown I00 °F Cooldown T ("F) P (psig) T (°F) P (psig) T (°F) P (psig) T (°F) P (psig) 60 Note I 60 Note I 60 Note I 60 Note 1 60 931 60 908 60 889 60 866 65 965 65 946 65 932 65 921 70 1003 70 989 70 980 70 980 75 1045 75 1036 75 1033 75 1033 80 1092 80 1088 80 l088 80 1088 85 1143 85 1143 85 1143 85 1143 90 1200 90 1200 90 1200 90 1200 95 1263 95 1263 95 1263 95 1263 100 1332 100 1332 too 1332 100 1332

!05 1409 !05 1409 l05 1409 105 1409 110 1494 110 1494 110 1494 110 1494 115 1587 115 1587 115 1587 115 1587 120 1691 120 1691 120 1691 120 1691 125 1805 125 1805 125 1805 125 1805 130 1932 130 1932 130 1932 130 1932 135 2071 135 2071 135 2071 135 2071 140 2226 140 2226 140 2226 140 2226 145 2396 145 2396 145 2396 145 2396 Note 1: The Minimum acceptable pressure is 0 psia 6

BRAIDWOOD~ UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 3.0 Low Temperature Overpressure Protection and Boltup This section provides the Braidwood Unit 2 power operated relief valve lift settings, low temperature overpressure protection (LTOP) system arming temperature, and minimum reactor vessel boltup tempemture.

3.1 LTOP System Setpoints (LCO 3.4.12).

The power operated relief valves (PORVs) shall each have nominal lift settings in accordance with Figure 3.1 and Table 3.1. These limits are based on References 3 and 8.

The LTOP setpoints are based on Pff limits that were established in accordance with IO CFR 50, Appendix G without allowance for instrumentation error. The LTOP setpoints were developed using the methodology described in Reference

1. The LTOP PORV nominal lift settings shown in Figure 3.1 and Table 3.1 account for appropriate instrument error.

3.2 LTOP Enable Temperature Braidwood Unit 2 procedures governing the heatup and cooldown of the RCS require the arming of the LTOP System for RCS temperature of 350°F and below and disarming of LTOP for RCS temperature above 350°F.

Note that the last LTOP PORV segment in Table 3.1 extends to 400°F where the pressure setpoint is 2335 psig. This is intended to prohibit PORV lift for an inadvertent LTOP system arming at power.

3.3 Reactor Vessel Boltup Temperature (Non-Technical Specification)

The minimum boltup temperature for the Reactor Vessel Flange shall be~ 60°F.

Boltup is a condition in which the Reactor Vessel head is installed with tension applied to any stud, and with the RCS vented to atmosphere.

7

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 2500 I i33Spslg 2250 2000 I

m;o I 8

ill Q.

i tiSOO I

i Q.

1250 Unocceplable Operation I

a:

0 Q.

l 1000 I

  • e

~

639 psig PCV456

! I I

599pelg '\.

" PCV455A 0

0 100 150 200 250 300 350 400 Auctlon. .red Low RCS Temp1mure IDEG. F)

Figure 3.1 Braidwood Unit 2 Nominal PORV Setpoints for the Low Temperature Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) 8

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 3.1 Data Points for Braidwood Unit 2 Nominal PORV Setpoints for the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)

PCV-455A PCV-456 RCS TEMP. RCS Pressure RCS TEMP. RCS Pressure (DEG. F) (PSIG) (DEG. F) (PSIG) 60 599 60 639 300 599 300 639 400 2335 400 2335 Note: To determine nominal lift setpoints for RCS Pressure and RCS Temperatures greater than 300°F, linearly interpolate between the 300°F and 400°F data points shown above. (Setpoints extend to 400°F to prevent PORV liftoff from an inadvertent LTOP system arming while at power).

9

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 4.0 Reactor Vessel Material Surveillance Program The pressure vessel material surveillance program (Reference 4) is in compliance with Appendix H to 10 CFR 50, "Reactor Vessel Radiation Surveillance Program." The material test requirements and the acceptance standards utilize the reference nil-ductility temperature, RTNOT, which is determined in accordance with ASME Boiler and Pressure Vessel Code,Section III, NB-2331.

The empirical relationship between RT NOT and the fracture toughness of the reactor vessel steel is developed in accordance with Appendix G, "Protection Against Non-Ductile Failure," to Section XI of the ASME Boiler and Pressure Vessel Code. The surveillance capsule removal schedule meets the requirements of ASTM E 185-82.

The third and final reactor vessel material irradiation surveillance specimens (Capsule W) have been removed and analyzed to determine changes in material properties. The surveillance capsule testing has been completed for the original operating period. The remaining three capsules, V, Y, and Z, were removed and placed in the spent fuel pool to avoid excessive fluence accumulation should they be needed to support life extension. The removal summary is provided in Table4.1.

IO

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 4.1 Braidwood Unit 2 Capsule Withdrawal Summary'0 >

Capsule Fluence Capsule Lead Factor Withdrawal EFPY<">

Location (n/cm2, E>l.O MeV) u 58.5° 4.08 l.18 0 .388 x 10 19 x 238.5° 4.03 4.24 1.15 x 10 19 w 121.5° 4.06 8.56 2.07 x 1019 zCc) 301.5° 4.14 12.78 (EOC 10) 2.83 x 10 19 y(c) 61.0° 3.92 18.42 (EOC 14) 3.73 x 1019 y<c> 241 .0° 3.89 12.78 (EOC 10) 2.66 x 1019 Notes:

(a) Source document is CN-AMLRS-10-7 (Reference 14), Table 5.7-4.

(b) Effective Full Power Years (EFPY) from plant startup.

(c) Standby Capsules Z, V, and Y were removed and placed in the spent fuel pool. No testing or analysis has been performed on these capsules. If license renewal is sought, one of these standby capsules may need to be tested to detennine the effect of neulron irradiation on the reactor vessel surveillance materials during the period of extended operation.

11

BRAIDWOOD* UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 5.0 Supplemental Data Tables The following tables provide supplemental information on reactor vessel material properties and are provided to be consistent with Generic Letter 96-03.

Some of the material property values shown were used as inputs to the Pff limits.

Table 5.1 shows the calculation of the surveillance material chemistry factors using surveillance capsule data.

Table 5.2 provides the reactor vessel material properties table.

Table 5.3 provides a summary of the Braidwood Unit 2 adjusted reference temperature (ART) values at the l/4T and 3/4T locations for 32 EFPY.

Table 5.4 shows the calculation of ARTs at 32 EFPY for the limiting Braidwood Unit 2 reactor vessel material.

Table 5.5 provides the RTPTS Calculation for Braidwood Unit 2 Beltline Region Materials at EOL (32 EFPY), (Reference 6).

12

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.1 Braidwood Unit 2 Calculation of Chemistry Factors Using Surveillance Capsule Data<0 >

Capsule rb1 ARTNDT(b) FF*ARTNDT Material Capsule FF<cl FF2 (n/cm1, E > 1.0 MeV) (oF) (oF)

Lower Shell u 0.388 x 1019 0.738 o.o<d1 0.00 0.54 Forging x 1.15 x 1019 1.039 o.o<d> 0.00 1.08 (Tangential) w 2.07 x 10 19 1.198 4.53 5.43 1.44 u 0.388 x 1019 0.738 o.o<d1 0.00 0.54 Lower Shell Forging x 1.15 x rn 19 1.039 33.94 35.26 1.08 (Axial) w 2.07 x 1019 1.198 33.2 39.78 1.44 SUM: 80.47 6.12 CF LS Forging= L(FF *ARTNO'T) + :E(FF2) = (80.47) + (6.12) = 13.2°F Braidwood Unit I u 0.388 x rn 19 0.738 17.06 12.59 0.54 Surveillance Weld x 1.17 x 10 19 1.044 30.15 31.47 1.09 Material w 1.98 x 1019 1.186 49.68 58.94 1.41 Braidwood Unit 2 u 0.388 x 10 19 0.738 o.o<d> 0.00 0.54 Surveillance Weld x 1.15 x 10 19 1.039 26.3 27.33 1.08 Material w 2.07 x 10 19 1.198 23.9 28.63 1.44 SUM: 158.96 6.10 CF Weld Mew= L(FF *ARTNor)+ L(FF2) = (158.96) + (6.IO) = 26.PF Notes:

(a) Source document is CN-AMLRS-10-7 (Reference 14), Table 5.2-2.

(b) f= fluence; ARTNDT values are the measured 30 ft-lb shift values taken from Reference 5.

(c) FF= fluence faclor =(0*28

  • o.io*ioa 0 (d) Measured ARTNDT values were determined to be negative, but physically a reduction should not occur; therefore, conservative values of zero are used.

13

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.2 Braidwood Unit 2 Reactor Vessel Material Properties Chemistry Initial Material Description Cu(%) Ni(%) RT NDT (°F)(o)

Factor Closure Head Flange Heat# 3P6566/5P7547/4P6986 -- 0.75 -- 20 Serial# 2031-V-1 Vessel Flange Heat # 124P455 0.07 0.70 -- 20 Nozzle Shell Forging

  • 26.0°Fbl 0.04 0.90 30 Heat # SP-7056 lntennediate Shell Forging
  • 20.0°Fb)

Heat # [49D963/49C904] 1 0.03 0.71 -30 0

Lower Shell Forging

  • 37.0°F '

0.06 0.76 13.2°Fc) -30 Heat# [500102/50C97]-l-l Circumferential Weld *

(Intermediate Shell to Lower Shell) 41.opb>

Weld Seam WF-562 0.03 0.67 26.lFc> 40 Heat# 442011 Circumferential Weld*

(Nozzle Shell to Intermediate Shell) 0.04 0.46 54.0°phl -25 Weld Seam WF-645 Heat#H4498

  • Beltline Region Materials a) The Initial RTNOT values for the plates and welds are based on measured data.

b) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 1.1.

c) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 2.1 14

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT

.Table 5.3 Summary of Braidwood Unit 2 Adjusted Reference Temperature (ART) Values at l/4T and 3/4T Locations for 32 EFPv**>

Surface Fluence 32EFPY Reactor Vessel Material (n/crn 2, E>l.O MeV) l/4T ART (°F) 3/4T ART (°F) 19 Nozzle Shell Forging 0 .559 x 10 66 54 19 Intermediate Shell Forging 1.73 x 10 JO -I 19 Lower Shell Forging 1.73 x 10 41 24

-+Using non-credible surveillance data 1.73 x 10 19 -3 -1 l Nozzle lo Intermediate Shell Forging Circ. Weld Seam 0.559x 1019 51 24 (Heat # H4498)

Intermediate to Lower Shell Forging Circ. Weld Seam 1.67 x 1019 122 99 (Heat# 442011)

-+Using credible surveillance data 1.67 x 10 19 92 78 Notes:

(a) The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14),

Tables 5.3.1-3 and 5.3. 1-4. The ART values summarized in this table utilize the most recent lluence projections and materials data, but were not used in development of the Prr limit curves.

See Figures 2.1 and 2.2 of this PTLR for the ART values used in development of the Pff limit curves.

15

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.4 Braidwood Unit 2 Calculation of Adjusted Reference Temperatures (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7056 Parameter Values Operating Time 32 EFPY Location~ai l/4T ART (°F) 3/4T ART(0 F)

Chemistry Factor, CF (°F) 26.0 26.0 Fluence(f), n/cm..:

3.40xl0 18 l.23xl018 (E>l.0 Mevib>

Fluence Factor, FF 0.703 0.460 ARTNor- CFxFF(°F) 18.3 12.0 Initial RT NOT.* 1(°F) 30 30 Marl?in, M(°F) 18.3 12.0 ART= I+(CF*FF)+M, °F 67 54 per RO l.99, Revision 2 a) The Braidwood Unit 2 reactor vessel wall thickness is 8.5 inches at the beltline region.

18 b) Fluence, f, is the calculated peak clad/base metal interface fluencc (E>l.0 Mev) =5.67xl0 n/cm2 at 32 EFPY (Reference 11).

16

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.5 RTPTS Calculation for Braidwood Unit 2 Beltline Region Materials at EOL (32 EFPYia.b)

R.G.1.99, IRTNDT<c) al

l.O MeV) (oF) (of) (OF) (OF) (Of) (oF) Position Nozzle Shell Forging 1.1 26 0.559 x 1019 0.8373 30 21.8 0 10.9 21.8 74 Intermediate Shell Forging I.I 20 1.73 x 1019 1.1508 -30 23.0 0 11.5 23.0 16 19 Lower Shell Forging l.l 37 l.73x 10 1.1508 -30 42.6 0 17 34 47 -Using non-credible surveillance data 2.l 13.2 1.73 x 1019 1.1508 -30 15.2 0 7.6 15.2 0 Nozzle to Intermediate Shell Forging Circ. Weld Seam 1.1 54 0.559x 1019 0.8373 -25 45.2 0 22.6 45.2 65 (Heal # H4498) Intermediate 10 Lower Shell Forging Circ. Weld Seam 1.1 41 1.67 x 1019 1.1413 40 46.8 0 23.4 46.8 134 (Heal # 442011) -Using credible surveillance data 2.1 26.l 1.67 x 1019 l.1413 40 29.8 0 14 28 98 ~: (a) The 10 CFR 50.61 methodology was utilized in the calculation of the RT!"TS values. (b) The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14), Table 5.5-2. (c) Initial RTNOT values are based on measured data. Hence, Gu= 0°F. (d) Per the guidance of 10 CFR 50.61, the base metal aA = 17°F for Position 1.1 (without surveillance data) and for Position 2. 1 with non-credible surveillance data; the weld metal GA= 28°F for Position I.I (without surveillance data) and with credible surveillance data GA= 14°F for Position 2.1. However, a A need not exceed O.S*aRTNDT* 17 BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 6.0 References
1. WCAP-14040-NP-A, Revision 2, "Methodology Used to Develop Cold Overpressure Mitigating System Setpoints and RCS Heatup and Cooldown Limit Curves", J.D.
Andrachek, et al., January 1996.
2. NRC Letter from R. A. Capra to O.D. Kingsley, Commonwealth Edison Company, "Byron Station Units 1 and 2 and Braidwood Station Units 1 and 2, Acceptance for referring of pressure temperature limits report, (M98799, M98800, M98801, and M98802)," January 21, 1998.
3. Westinghouse Letter to Exelon Nuclear, CAE-10-MUR-197, Revision 0, "Low Temperature Overpressure Protection (LTOP) System Evaluation Final Letter Report,"
M.P. Rudakewiz, September 8, 2010.
4. WCAP-11188, "Commonwealth Edison Company, Braidwood Station Unit 2 Reactor Vessel Surveillance Program," December 1986.
5. WCAP-15369, "Analysis of Capsule W from the Commonwealth Edison Company Braidwood Unit 2 Reactor Vessel Radiation Surveillance Program," March 2000.
6. WCAP-15381, "Evaluation of Pressurized Thermal Shock for Braidwood Unit 2", T.J.
Laubham, September 2000.
7. NRC Letter from G. F. Dick, Jr., NRR, to C. Crane, Exelon Generation Company, LLC, "Issuance of Amendments: Revised Pressure-Temperature Limits Methodology; Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2," dated October 4, 2004.
8. Byron & Braidwood Design Information Transmittal DIT-BRW-2006-0051, "Transmittal of Braidwood Unit l and Unit 2 Temperature and Pressure Uncertainties for Low Temperature Overpressure System (LTOPS) Power Operated Relief Valves (PORVS)," Nathan (Joe) Wolff Jr., July 18, 2006.
9. NRC Letter from M. Chawla to O.D. Kingsley, Exelon Generation Company, LLC, "Issuance of exemption from the Requirements of 10 CFR 50 Part 60 and Appendix G for Byron Station, Units 1 and 2, and Braidwood Stations, Units 1 and 2," dated August 8, 2001.
10. NRC Letter from R. F. Kuntz, NRR, to C. M. Crane, Exelon Generation Company, LLC, "Byron Station, Unit Nos. 1 and 2, and Braidwood Station, Unit Nos. 1 and 2 -
Issuance of Amendments Re: Reactor Coolant System Pressure and Temperature Limits Report (TAC Nos. MC8693, MC8694, MC8695, and MC8696)," November 27, 2006.
11. WCAP- 15373, Revision 2, "Braidwood Unit 2 Heatup and Cooldown Limits for Normal Operation," T.J. Laubham et al., November 2003.
18 BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT
12. WCAP-16143-P, Revision l, ..Reactor Vessel Closure Head/Vessel Flange Requirements Evaluation for Byron/Braidwood Units 1 and 2," W. Bamford, et al.,
October 2014.
13. Westinghouse Letter to Exelon Nuclear, CCE-07-24, ..Braidwood Unit 1and2 RCS HU/CD Limit Curve Table Values," dated February 15, 2007.
14. Westinghouse Calculation Note CN-AMLRS-10-7, Revision O. "Braidwood Units I and 2 Measurement Uncertainty Recapture (MURJ Uprate: Reactor Vessel Integrity Evaluations." A.E. Leicht, September 2010, and Westinghouse evaluation MCOE-LTR-13-102 Rev. 0, ..Byron and Braidwood Closure Head/Vessel Flange Region: MUR Uprate Assessment," November 2013.
l9 Exelon Gonorotion Company, LLC Brmdwood Station Exelon Generation< 35100 South Route 53, Suito 64 Bracovitlo, IL 60401*9619 December 10, 2015 BW150112 U.S. Nuclear Regulatory Commission ATIN: Document Control Desk Washington, DC 20555-0001 Braidwood Station, Units 1 and 2 Facility Operating License Nos. NPF-72 and NPF-77 NRC Docket Nos. STN 50-456 and 50-457

Subject:

Braidwood Unit 1 - Pressure and Temperature Limits Reports (PTLRs), Revision 8 Braidwood Unit 2 - Pressure and Temperature Limits Reports (PTLRs), Revision 7

Reference:

Letter from U.S. NRC to B.C. Hanson (Exelon Generation Company, LLC),

"Issuance of Amendments to Utilize WCAP-16143-P, Revision 1, "Reactor Vessel Closure HeadNessel Flange Requirements Evaluation for Byron/Braidwood Units 1 and 2," dated October 16, 2014," dated October 28, 2015 The purpose of this letter is to transmit the Pressure and Temperature Limits Reports (PTLRs) for Braidwood Station, Units 1 and 2 in accordance with Technical Specification (TS) 5.6.6, "Reactor Coolant System (RCS) Pressure and Temperature Limits Report (PTLR)."

The Braidwood Unit 1 and Unit 2 PTLRs were revised to update the reference to WCAP-16143-P, "Reactor Vessel Closure HeadNessel Flange Requirements Evaluation for Byron/Braidwood Units 1 and 2," from Revision Oto Revision 1 for consistency with the referenced Technical Specification Amendment.

Please direct any questions you may have regarding this matter to Mr. Phillip Raush, Regulatory Assurance Manager, at (815) 417-2800.

Marri Ma hionda-Palmer Site Vice resident Braidwood Station Attachments: 1. Braidwood Unit 1 Pressure Temperature Limits Report (PTLR), Revision 8 2 Braidwood Unit 2 Pressure Temperature Limits Report (PTLR), Revision 7

ATTACHMENT 1 Braidwood Unit 1 Pressure and Temperature Limits Report (PTLR), Revision 8

BRAIDWOOD UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT (PTLR)

Revision 8

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table of Contents Section Page l .O Introduction 2.0 RCS Pressure and Temperature Limits L 2.1 RCS Pressure and Temperature (Pff) Limits (LCO 3.4.3) 1 3.0 Low Temperature Over Pressure Protection and Boltup 7 3.1 LTOP System Setpoints (LCO 3.4.12) 7 3.2 LTOP Enable Temperature 7 3.3 Reactor Vessel Boltup Temperature (Non-Technical Specification) 7 4.0 Reactor Vessel Material Surveillance Program 10 5.0 Supplemental Data Tables 12 6.0 References 18

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT List of Figures Figure Page 2.1 Braidwood Unit 1 Reactor Coolant System Heatup Limitations (Heatup 3 Rate of 100°F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 2.2 Braidwood Unit 1 Reactor Coolant System Cooldown Limitations 4 (Cooldown Rates of 0, 25, 50, and l00°F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors)

3. 1 Braidwood Unit 1 Nominal PORV Setpoints for the Low Temperature 8 Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) ii

BRAIDWOOD

  • UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT List of Tables Table Page 2.la Braidwood Unit l Heatup Data Points at 32 EFPY (Without 5 Margins for Instrumentation Errors) 2.lb Braidwood Unit 1 Cooldown Data Points at 32 EFPY (Without 6 Margins for Instrumentation Errors) 3.1 Data Points for Braidwood Unit l Nominal PORV Setpoints for 9 the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) 4.1 Braidwood Unit l Surveillance Capsule Withdrawal Summary 11 5.1 Braidwood Unit l Calculation of Chemistry Factors Using 13 Surveillance Capsule Data 5.2 Braidwood Unit 1 Reactor Vessel Material Properties 14 5.3 Summary of Braidwood Unit 1 Adjusted Reference Temperature 15 (ART) Values at 1/4T and 3/4T Locations for 32 EFPY 5.4 Braidwood Unit 1 Calculation of Adjusted Reference 16 Temperatures (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7016 5.5 RTPTs Calculation for Braidwood Unit 1 Beltline Region 17 Materials at EOL (32 EFPY) iii

BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 1.0 Introduction This Pressure and Temperature Limits Report (PTLR) for Braidwood Unit 1 has been prepared in accordance with the requirements of Braidwood Technical Specification (TS) 5.6.6, "Reactor Coolant System (RCS) Pressure and Temperature Limits Report (PTLR)".

Revisions to the PTLR shall be provided to the NRC after issuance.

The Technical Specifications (TS) addressed in this report are listed below:

LCO 3.4.3 RCS Pressure and Temperature (Pff) Limits; and LCO 3.4.12 Low Temperature Overpressure Protection (LTOP) System.

2.0 RCS Pressure and Temperature Limits The PTLR limits for Braidwood Unit l were developed using a methodology specified in the Technical Specifications. The methodology listed in WCAP-14040-NP-A, Revision 2 (Reference 1) was used with the following exceptions:

a) Optional use of ASME Code Section XI, Appendix G, Article G-2000, 1996 Addenda, b) Use of ASME Code Case N-640, ..Alternative Reference Fracture Toughness for Development of P-T Limit Curves,Section XI, Di vision I",

c) Use of ASME Code Case N-588, "Alternative to Reference Flaw Orientation of Appendix G for Circumferential Welds in Reactor Vessel,Section XI, Division l ",

and d) Elimination of the flange requirements documented in WCAP-16143-P.

These exceptions to the methodology in WCAP 14040-NP-A, Revision 2 have been reviewed and accepted by the NRC in References 2, 8, 9 and I 0.

WCAP 15364, Revision 2 (Reference 11), provides the basis for the Braidwood Unit l Pff curves, along with the best estimate chemical compositions, fluence projections and adjusted reference temperatures used to determine these limits. WCAP-16143-P, Reference 12, documents the technical basis for the elimination of the flange requirements.

2.1 RCS Pressure and Temperature (Pff) Limits (LCO 3.4.3) 2.1.1 The RCS temperature rate-of-change limits defined in WCAP-15364, Revision 2 (Reference 11) are:

a A maximum heatup of 100°F in any 1-hour period,

b. A maximum cooldown of 100°F in any I-hour period, and

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT

c. A maximum temperature change of less than or equal to l0°F in any I-hour period during inservice hydrostatic and leak testing operations above the heatup and cooldown limit curves.
2. 1.2 The RCS Pff limits for heatup, inservice hydrostatic and leak testing, and criticality are specified by Figure 2.1 and Table 2. la. The RCS Pff limits for cooldown are shown in Figure 2.2 and Table 2. lb. These limits are defined in WCAP-15364, Revision 2 (Reference 11). Consistent with the methodology described in Reference 1 and exceptions noted in Section 2.0, the RCS Pff limits for heatup and cooldown shown in Figures 2.1 and 2.2 are provided without margins for instrument error. These limits were developed using ASME Boiler and Pressure Vessel Code Section XI, Appendix G, Article G2000, 1996 Addenda.

The criticality limit curve specifies pressure-temperature limits for core operation to provide additional margin during actual power production as specified in 10 CFR 50, Appendix G.

The Pff limits for core operation (except for low power physics testing) are that the reactor vessel must be at a temperature equal to or higher than the minimum temperature required for the inservice hydrostatic test, and at least 40°F higher than the minimum pennissible temperature in the corresponding Pff curve for heatup and cooldown.

2

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT MATERIAL PROPERTY BASIS '

LIMITING MATERIAL: NO:ZZLE SHELL FORGING SP-7016 LIMITING ART VALUES AT 32 EFPY: l/4T, 48°F 3/4T, 35°F 2500 *.

r

Leak Test Limit I OpeMlm Verslon
5.1 Run:29844 2250 .

j Acceptable 2000 . Operation Unacceptable Operation j j

-us 1750 C!J c.

1500 *I- Heatup Rate 100 Deg. F/Hr I II~ L--"'

Critical Limit 100 Deg. F/Hr

~

Cl)

J fl) fl) )

! 1250 ..

c. ,_-! ,./

'ti

! 1000

J u .

"i Crltlcallty Limit based on 0 750 . lnaervlce hydrostatic test

~ temperature (1 OS'F) for the service period up to 32 EFPY 500 Boltup I~

Temp 250 .

0 ..

IThe lower llmlt for RCS 1 pressure lso psla

~

n 0 50 100 150 200 250 300 350 400 450 500 550 Moderator Temperature (Deg. F)

Figure 2.1 Braidwood Unit 1 Reactor Coolant System Heatup Limitations (Heatup Rate of 100°F/hr)

Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 3

BRAIDWOOD

Unacceptable Operation Acceptable 2000 ~

Operation CJ 1750 .

ii5 a.

Q)

J fl) 1500 . J fl) 1250 ..

Q)

a. .

/1 Cooldown Rates 1ca 1000 .

(°F/Hr) steady.state,

'3 -25, u -50, and

'ii -100 0 750 500 .

. I 250

- I Boltup Temp. I 0 ~

IJ!he lower llmlt for RCS I

pressure la Opsla I I

0 50 100 150 200 250 300 350 400 450 500 550 Moderator Temperature (Deg. F)

Figure 2.2 Braidwood Unit 1 Reactor Coolant System Cooldown Limitations (Cooldown Rates of 0, 25, 50 and 100°F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 4

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.la Braidwood Unit 1 Heatup Data Points at 32 EFPY (Without Margins for Instrumentation Errors)

Heatup Curve 100 F Heatup Criticality Leak Test Limit Limit T (°F) P <osie:) T(°F) P (osi2) T<°F) P (osi iz) 60 Note I 108 Note I 91 2000 60 1064 108 1114 108 2485 65 1114 I to 1166 70 1166 115 1172 75 1172 120 1176 80 1176 125 1188 85 1188 130 1207 90 1207 135 1234 95 1234 140 1267 100 1267 145 1308 105 1308 150 1357 110 1357 155 1414 115 1414 160 1479 120 1479 165 1554 125 1554 170 1638 130 1638 175 1732 135 1732 180 1838 140 1838 185 1956 145 1956 190 2088 150 2088 195 2235 155 2235 200 2397 160 2397 Note l :The Minimum acceptable pressure is 0 psi a

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.lb Braidwood Unit 1 Cooldown Data Points at 32 EFPY (Without Margins for Instrumentation Errors)

Cooldown Curves Sleady Stale 25 °F Cooldown 50 °F Cooldown 100 °F Cooldown T (°F) P (psig) T(°F) P (psig) T (°F) P (psig) T (°F) P (psig) 60 Note 1 60 Note I 60 Note I 60 Note I 60 1082 60 1078 60 l078* 60 1078*

65 1133 65 1133 65 1133 65 1133 70 1188 70 t 188 70 1188 70 1188 75 1250 75 1250 75 1250 75 1250 80 1318 80 1318 80 1318 80 1318 85 1393 85 1393 85 1393 85 1393 90 1476 90 1476 90 1476 90 1476 95 1568 95 1568 95 1568 95 1568 100 1669 JOO 1669 100 1669 JOO 1669 105 1781 105 1781 105 1781 105 1781 110 1905 110 1905 110 1905 110 1905 115 2042 115 2042 115 2042 115 2042 120 2194 120 2194 120 2194 120 2194 125 2361 125 2361 125 2361 125 2361

  • Refer to Reference 13 Note 1:The Minimum acceptable pressure is 0 psia 6

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 3.0 Low Temperature Overpressure Protection and Boltup This section provides the Braidwood Unit 1 power opemted relief valve lift settings, low temperature overpressure protection (LTOP) system arming temperature, and minimum reactor vessel boltup temperature.

3.1 LTOP System Setpoints (LCO 3.4.12)

The power operated relief valves (PORVs) shall each have maximum lift settings in accordance with Figure 3.1 and Table 3. l. These limits are based on References 3 and 4.

The LTOP setpoints are based on Pff limits which were established in accordance with 10 CFR 50, Appendix G without allowance for instrumentation error and in accordance with the methodology described in Reference l. The LTOP PORV nominal lift settings shown in Figure 3.1 and Table 3. 1 account for appropriate instrument error.

3.2 LTOP Enable Temperature Braidwood Unit 1 procedures governing the heatup and cooldown of the RCS require the arming of the LTOP System for RCS temperature of 350°F and below and disarming of LTOP for RCS temperature above 350°F.

Note that the last LTOP PORV segment in Table 3.1 extends to 400°F where the pressure setpoint is 2335 psig. This is intended to prohibit PORV lift for an inadvertent LTOP system arming at power.

3.3 Reactor Vessel Boltup Temperature (Non-Technical Specification)

The minimum boltup temperature for the Reactor Vessel Flange shall be~ 60°F. Boltup is a condition in which the Reactor Vessel head is installed with tension applied to any stud, and with the RCS vented to atmosphere.

7

BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT I 2335ps1g 2250 2000 I

_ 1750 I S!

~

! 1500 I I

a. 1250 Unacceplable Operation I

I IC 2

.. 1000

  • ec

~

750 595 pslg PCV-456 i

I II I

500 541 pslg

" ' PCV-455A 0

0 mo 150 200 250 300 350 Auctlaneenid Low RCS Temperaluni (DEG. F)

Figure 3.1 Braidwood Unit 1 Nominal PORV Setpoints for the Low Temperature Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) 8

BRAIDWOOD-UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 3.1 Data Points for Braidwood Unit 1 Nominal PORV Setpoints for the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)

PCV-455A PCV-456 (ITY-0413M) (ITY-0413P)

AUCTIONEERED LOW RCS PRESSURE AUCTIONEERED LOW RCS PRESSURE RCS TEMP. (DEG. F) (PSIG) RCS TEMP. (DEG. F) (PSIG) 60 541 60 595 300 541 300 595 400 2335 400 2335 Note: To determine nominal lift setpoints for RCS Pressure and RCS Temperatures greater than 300°F, linearly interpolate between the 300°F and 400°F data points shown above. (Setpoints extend to 400°F to prevent PORV liftoff from an inadvertent LTOP system arming while at power.)

9

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 4.0 Reactor Vessel Material Surveillance Program The pressure vessel material surveillance program (Reference 5) is in compliance with Appendix H to 10 CFR 50, "Reactor Vessel Radiation Surveillance Program." The material test requirements and the acceptance standard utilize the reference nil-ductility temperature, RTNDT, which is determined in accordance with ASME Boiler and Pressure Vessel Code Section III, NB-2331. The empirical relationship between RTNoT and the fracture toughness of the reactor vessel steel is developed in accordance with Appendix G, "Protection Against Non-Ductile Failure," to Section XI of the ASME Boiler and Pressure Vessel Code. The surveillance capsule removal schedule meets the requirements of ASTM El85-82.

The third and final reactor vessel material irradiation surveillance specimens (Capsule W) have been removed and analyzed to determine changes in material properties. The surveillance capsule testing has been completed for the original operating period. The remaining three capsules, V, Y, and Z, were removed and placed in the spent fuel pool to avoid excessive fluence accumulation should they be needed to support life extension.

The removal summary is provided in Table 4.1.

10

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT

.Table 4.1 Braidwood Unit 1 Capsule Withdrawal Summary(*)

Capsule Fluence Capsule Lead Factor Withdrawal EFPY

Location (n/cm2, E>l.O MeV) u 58.5° 4.02 1.16 0.388 x 10 19 x 238.5° 4.06 4.30 1.17 x 10 19 w 121.5° 4.05 7.79 l.98 x 1019 z<c) 301.5° 4.09 12.01 (EOC 10) 2.79 x 10 19 y(c) 61.0° 3.92 17.69 (EOC 14) 3.71 x 10 19 y<c) 241.0° 3.81 12.01 (EOC 10) 2.60 x 1019 Notes:

(a) Source document is CN-AMLRS-I0-7 (Reference 14), Table 5.7-3.

(b) Effective Full Power Years (EFPY) from plant startup.

(c) Standby Capsules Z, V, and Y were removed and placed in the spent fuel pool. No testing or analysis has been performed on these capsules. If license renewal is sought, one of these standby capsules may nt!ed to be tested to determine the effect of neutron irradiation on the reactor vessel surveillance materials during the period of ex1ended operation.

ll

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 5.0 Supplemental Data Tables The foJlowing tables provide supplemental information on reactor vessel material properties and are provided to be consistent with Generic Letter 96-03. Some of the material property values shown were used as inputs to the Pff limits.

Table 5.1 shows the calculation of the surveillance material chemistry factors using surveillance capsule data.

Table 5.2 provides the reactor vessel material properties table.

Table 5.3 provides a summary of the Braidwood Unit I adjusted reference temperature (ART) values at the l/4T and 3/4T locations for 32 EFPY.

Table 5.4 shows the calculation of ARTs at 32 EFPY for the limiting Braidwood Unit I reactor vessel material, i.e. weld WF-562 ( HT # 442011, Based on Surveillance Capsules U and X Data).

Table 5.5 provides the RTns calculation for Braidwood Unit 1 Beltline Region Materials at EOL (32 EFPY), (Reference 7).

12

BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.1 Braidwood Unit 1 Calculation of Chemistry Factors Using Surveillance Capsule Data<11 >

Capsule f<bl .1.RTNllTlbl FP.1.RTNDT Material Capsule FF<c1 FF2 (n/cm2, E > 1.0 MeV) (oF) (oF) u 0.388 x 1019 0.738 5.78 4.26 0.54 Lower Shell Forging x 1.17 x 10 19 1.044 38.23 39.91 1.09 (Tangential) w 1.98 x 1019 1.186 24.14 28.64 1.41 u 0.388 x 10 19 0.738 o.01d1 0.00 0.54 Lower Shell Forging x 1.17 x 10 19 1.044 28.75 30.01 1.09 (Axial) w 1.98 x 1019 1.186 37. 11 44.03 1.41 SUM: 146.85 6.08 CF LSForJini =L(FF *.1.RTNoT) + L(FF2) =(146.85) + (6.08) =24.1°F u 0.388 x 1019 0.738 17.06 12.59 0.54 Braidwood Unit 1 Surveillance Weld x 1.17 x 1019 1.044 30.15 31.47 1.09 Material w 1.98 x 10 19 1.186 49.68 58.94 1.41 Braidwood Unit 2 u 0.388 x 1019 0.738 o.o<d> 0.00 0.54 Surveillance Weld x 1.15 x 10 19 1.039 26.3 27.33 1.08 Material w 2.07 x 10 19 1.198 23.9 28.63 1.44 SUM: 158.96 6.10 CF Wckll'.lcw =L(FF "'ARTNoT) + L(FF ) =(158.96) + (6.10) =26.l°F 2

~:

(a) Source document is CN-AMLRS-10-7 (Reference 14), Table 5.2-1.

(b) f = fluence; .1.RTNOT values are the measured 30 ft-lb shift values taken from Reference 6.

(c) =

FF fluence factor =r 0*28

  • o.io*1og I)

(d) Measured ARTNm values were determined to be negative, but physically a reduction should not occur; therefore, conservative values of zero are used.

IJ

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.2

.Braidwood Unit 1 Reactor Vessel Material Properties Chemistry Initial Material Description Cu(%) Ni(%)

Factor RT NOT {°F)(a)

Closure Head Flange Heat# 5P738 l/3P6406 0.1 l 0.67 -- -20 Vessel Flange Heat # 122N357V -- 0.77 -- -10 Nozzle Shell Forging

  • 26.0°Pb>

0.04 0.73 10 Heat# 5P-7016 Intermediate Shell Forging

  • 0.05 0.73 3 l .0°Pb> -30 Heat # [49D383/49C344)-1-1 0

Lower Shell Forging

  • 31.0°F '

0.05 0.74 24.l ope> -20 Heat# [49D867/49C813]-l-l Circumferential Weld* 4l.0°Pb>

(Intermediate Shell to Lower Shell) 0.03 0.67 26.1 ope> 40 WF-562 (HT# 442011)

Upper Circumferential Weld*

(Nozzle Shell to Intermediate Shell) 0.04 0.46 54.oopbl -25 WF-645 (HT# H4498)

  • Beltline Region Materials a) The Initial RTNoTvalues for the plates and welds are based on measured data.

b) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 1.1.

c) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 2.1.

14

BRAIDWOOD

.Table 5.3 Summary of Braidwood Unit 1 Adjusted Reference Temperature (ART) Values at l/4T and 3/4T Locations for 32 EFPv1*>

32 EFPY Surface Flucncc Reactor Vcssel Material 1/4TART 3/4TART (n/cm2, E>l.O McV)

(OF) (oF)

Nozzle Shell Forging 0.586 lt 1019 47 34 19 Intermediate Shell Forging 1.76 x 10 33 15 Lower Shell Forging 1.76 x 10 19 43 25

-.Using credible surveillance data 1.76 x 10 19 21 15 Nozzle to Intermediate Shell Forging Circ. Weld Seam 0 .586x 1019 52 25 (Heat # H4498)

Intermediate to Lower Shell Forging Circ. Weld Seam 1.70 x 10 19 122 99 (Heat# 442011)

-Using credible surveillance data 1.70 x 1019 93 78

~:

(a) The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14),

Tables 5.3. 1-1 and 5.3.1-2. The ART values summarized in this table utilize the most recent fluence projections and materials data, but were not used in development of the Pff limit curves. See Figures 2.1 and 2.2 of this PTLR for the ART values used in development of the Pff limit curves.

15

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT

.Table 5.4 Braidwood Unit 1 Calculation of Adjusted Reference Temperatures (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7016 Parameter Values Operating Time 32 EFPY Locationtai l/4T ART(°F) 3/4T ART(°F)

Chemistry Factor, CF (°F) 26.0 26.0 Fluence(t), n/cml 3.65 x 1018 l.32 xl0 18 (E> 1.0 Mev)

Fluence Factor, FF 0.772 0.475 i1RTNor= CFxFF(°F) 18.8 12.4 Initial RT Nor.* 1(°F) 10 10 Margin, M (°F) 18.8 12.4 ART= I+(CF*FF)+M,°F 48 35 per RG 1.99, Revision 2 (a) The Braidwood Unit I reactor vessel wall thickness is 8.5 inches at the beltline region.

(b) Flucnce r, is based upon f,wf (E > 1.0 Mev) = 6.08 x 1018 at 32 EFPY (Reference 11).

l6

BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.5 RTPTS Calculation for Braidwood Unit 1 Beltline Region Materials at EOL (32 EFPYi*,h>

(c R.G.1.99, IRTNDT Cfu<c> CfJ.(d) Margin CF Fluence I .ARTNDT RTFrS Reactor Vessel Material Rev.2 (oF) (n/cm2, E>l.O MeV)

FF (oF) (Of) {of) (oF) (Of)

Position (OF)

Nozzle Shell Forging 1.1 26 0.586 x 1019 0.8504 10 22. l 0 l l.l 22.l 54 Intennediate Shell Forging l.l 31 1.76 x 10 19 1.1554 -30 35.8 0 17 34 40 Lower Shell Forging 1.1 31 1.76 x 1019 1.1554 -20 35.8 0 17 34 50

-+Using credible surveillance data 2.1 24.l l.76x 1019 l.l554 -20 27.8 0 8.5 17 25 Nozzle to Intermediate Shell Forging Circ. Weld Seam I.I 54 0.586x 10 19 0.8504 -25 45.9 0 23.0 45.9 67 (Heat # H4498)

Intermediate to Lower Shell Forging Circ. Weld Seam I.I 41 1.70 x 1019 1.1461 40 47.0 0 23.5 47.0 134 (Heat# 442011)

-+Using credible surveillance data 2. 1 26.l 1.70 x 1019 1.1461 40 29.9 0 14 28 98 Notes:

(a) The 10 CFR 50.61 methodology was uti.lized in the calculation of the RTPTS values.

(b) The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14), Table 5.5-l.

(c) Initial RTNDT values are based on measured data. Hence, Gu= 0°F.

=

(d) Per the guidance of 10 CFR 50.61, the base metal a11 l 7°F for Position 1.1 (without surveillance data) and with credible surveillance data a4 = 8.5°F for Position 2.1; the weld metal a 4 =28°F for Position I.I (without surveillance data) and with credible surveillance data cr4 =

14°F for Position 2.1. However, cr4 need not exceed 0.5*.6.RTNDT*

17

BRAIDWOOD* UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT 6.0 References

1. WCAP-14040-NP-A, Revision 2, "Methodology Used to Develop Cold Overpressure Mitigating System Setpoints and RCS Heatup and Cooldown Limit Curves," J.D. Andrachek, et al., January 1996.
2. NRC Letter from R. A. Capra to O.D. Kingsley, Commonwealth Edison Company, "Byron Station Units 1 and 2 and Braidwood Station Units 1 and 2, Acceptance for referring of pressure temperature limits report, (M98799, M98800, M98801, and M98802)," January 21 1998.
3. Westinghouse Letter to Exelon Nuclear, CAE-10-MUR-197, Revision 0, "Low Temperature Overpressure Protection (LTOP) System Evaluation Final Letter Report," M.P. Rudakewiz, September 8, 2010.
4. Byron & Braidwood Design Information Transmittal DIT-BRW-2006-0051, "Transmittal of Braidwood Unit 1 and Unit 2 Temperature and Pressure Uncertainties for Low Temperature Overpressure System (LTOPS) Power Operated Relief Valves (PORVS)," Nathan (Joe)

Wolff Jr., July 18, 2006.

5. WCAP-9807, "Commonwealth Edison Company, Braidwood Station Unit 1 Reactor Vessel Radiation Surveillance Program," S.E. Yanichko, et al., February 1981.
6. WCAP-15316, Revision l, "Analysis of Capsule W from Commonwealth Edison Company Braidwood Unit l Reactor Vessel Radiation Surveillance Program," E. Terek, et al.,

December 1999.

7. WCAP-15365, Revision l, "Evaluation of Pressurized Thermal Shock for Braidwood Unit l," J.H. Ledger, January 2002.
8. NRC Letter from G. F. Dick, Jr., NRR, to C. Crane, Exelon Generation Company, LLC, "Issuance of Amendments: Revised Pressure-Temperature Limits Methodology; Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2," dated October 4, 2004.
9. NRC Letter from M. Chawla to O.D. Kingsley, Exelon Generation Company, LLC, "Issuance of exemption from the Requirements of 10 CFR 50 Part 60 and Appendix G for Byron Station, Units l and 2, and Braidwood Stations, Units 1 and 2," dated August 8, 200 l .
10. NRC Letter from R. F. Kuntz, NRR, to C. M. Crane, Exelon Generation Company, LLC, "Byron Station, Unit Nos. 1 and 2, and Braidwood Station, Unit Nos. 1 and 2- Issuance of Amendments Re: Reactor Coolant System Pressure and Temperature Limits Report (TAC Nos. MC8693, MC8694, MC8695, and MC8696)," November 27, 2006.

18

BRAIDWOOD - UNIT 1 PRESSURE AND TEMPERATURE LIMITS REPORT

11. WCAP-15364, Revision 2, "Braidwood Unit 1 Heatup and Cooldown Limit Curves for Normal Operation," T.J. Laubham, November 2003.
12. WCAP-16143-P, Revision I, "Reactor Vessel Closure Head/Vessel Flange Requirements Evaluation for Byron/Braidwood Units I and 2," W. Bamford, et al., October 2014.
13. Westinghouse Letter to Exelon Nuclear, CCE-07-24, "Braidwood Unit I and 2 RCS HU/CD Limit Curve Table Values," dated February 15, 2007.
14. Westinghouse Calculation Note CN-AMLRS-10-7, Revision 0, "Braidwood Units 1 and:?

Measurement Uncc11ainty Recapture (MUR) Uprate: Reactor Vessel Integrity Evaluations,"

A.E. Leicht. September 2010.

19

ATTACHMENT 2 Braidwood Unit 2 Pressure and Temperature Limits Report (PTLR), Revision 7

BRAIDWOOD UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT (PTLR)

Revision 7

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table of Contents Section Page 1.0 Introduction 1 2.0 RCS Pressure Temperature Limits 2.1 RCS Pressure and Temperature (P/f) Limits (LCO 3.4.3) 3.0 Low Temperature Over Pressure Protection and Boltup 7 3.1 LTOP System Setpoints (LCO 3.4.12) 7 3.2 LTOP Enable Temperature 7 3.3 Reactor Vessel Boltup Temperature (Non-Technical Specification) 7 4.0 Reactor Vessel Material Surveillance Program 10 5.0 Supplemental Data Tables 12 6.0 References 18

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATORE LIMITS REPORT List of Figures Figure Page 2.1 Braidwood Unit 2 Reactor Coolant System Heatup Limitations 3 (Heatup Rate of l 00°F/hr) Applicable for 32 EFPY (Without Margins for Instrumentation Errors) 2.2 Braidwood Unit 2 Reactor Coolant System Cooldown Limitations 4 (Cooldown Rates of 0, 25, 50 and 100°F/hr) Applicable to 32 EFPY (Without Margins for Instrumentation Errors) 3.1 Braidwood Unit 2 Nominal PORV Setpoints for the Low Temperature 8 Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)

BRAIDWOOD .. UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT List of Tables Table Page

2. la Braidwood Unit 2 Heatup Data at 32 EFPY (Without 5 Margins for Instrumentation Errors)
2. lb Braidwood Unit 2 Cooldown Data Points 32 EFPY (Without 6 Margins for lnstrumentation Errors)
3. l Data Points for Braidwood Unit 2 Nominal PORV 9 Setpoints for the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)
4. 1 Braidwood Unit 2 Capsule Withdrawal Summary 11 5.1 Braidwood Unit 2 Calculation of Chemistry Factors Using 13 Surveillance Capsule Data 5.2 Braidwood Unit 2 Reactor Vessel Material Properties 14 5.3 Summary of Braidwood Unit 2 Adjusted Reference 15 Temperature (ART) Values at l/4T and 3/4T Locations for 32 EFPY 5.4 Braidwood Unit 2 Calculation of Adjusted Reference 16 Temperature (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7056 5.5 RTPTS Calculation for Braidwood Unit 2 Beltline Region 17 Materials at EOL (32 EFPY)

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 1.0 Introduction This Pressure and Temperature Limits Report (PTLR) for Braidwood Unit 2 has been prepared in accordance with the requirements of Braidwood Technical Specification (TS) 5.6.6, "Reactor Coolant System (RCS) Pressure and Temperature Limits Report (PTLR)". Revisions to the PTLR shall be provided to the NRC after issuance.

The Technical Specifications addressed in this report are listed below:

LCO 3.4.3 RCS Pressure and Temperature (Pff) Limits; and LCO 3.4.12 Low Temperature Overpressure Protection (LTOP) System.

2.0 RCS Pressure Temperature Limits The PTLR limits for Braidwood Unit 2 were developed using a methodology specified in the Technical Specifications. The methodology listed in WCAP-14040-NP-A, Revision 2 (Reference I) was used with the following exception:

a) Optional use of ASME Code Section XI, Appendix G, Article G-2000, 1996 Addenda, b) Use of ASME Code Case N-640, "Alternative Reference Fracture Toughness for Development of P-T Limit Curves,Section XI, Division l", and c) Use of ASME Code Case N-588, "Alternative to Reference Flaw Orientation of Appendix G for Circumferential Welds in Reactor Vessel,Section XI, Division 1", and d) Elimination of the flange requirements documented in WCAP-16143-P.

This exception to the methodology in WCAP 14040-NP-A, Revision 2 has been reviewed and accepted by the NRC in References 2, 7, 9, and 10.

WCAP 15373, Revision 2 (Reference 11), provides the basis for the Braidwood Unit 2 Pff curves, along with the best estimate chemical compositions, fluence projections and adjusted reference temperatures used to detennine these limits.

WCAP-16143-P, Reference 12, documents the technical basis for the elimination of the flange requirements.

2.1 RCS Pressure and Temperature (Pff) Limits (LCO 3.4.3) 2.1. l The RCS temperature rate-of-change limits defined in Reference 11 are:

a. A maximum heatup of 100°F in any I-hour period.
b. A maximum cooldown of 100°F in any I-hour period, and 1

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT .

c. A maximum temperature change of less than or equal to l0°F in any I-hour period during inservice hydrostatic and leak testing operations above the heatup and cooldown limit curves.

2.1.2 The RCS Pff limiL'i for heatup, inservice hydrostatic and leak testing, and criticality are specified by Figure 2.1 and Table 2.1 a. The RCS Pff limits for cooldown are shown in Figure 2.2 and Table 2.1 b. These limits are defined in WCAP-15373, Revision 2 (Reference 11). Consistent with the methodology described in Reference l, with the exception noted in Section 2.0, the RCS Pff limits for heatup and cooldown shown in Figures 2.1 and 2.2 are provided without margins for instrument error. These limits were developed using ASME Boiler and Pressure Vessel Code Section XI, Appendix G, Article G2000, 1996 Addenda. The criticality limit curve specifies pressure-temperature limits for core operation to provide additional margin during actual power production as specified in LO CFR 50, Appendix G.

The Pff limits for core operation (except for low power physics testing) are that the reactor vessel must be at a temperature equal to or higher than the minimum temperature required for the inservice hydrostatic test, and at least 40°F higher than the minimum permissible temperature in the corresponding Pff curve for heatup and cooldown.

2

BRAIDWOOD* UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Material Proocrty Basis Limiting Material: Circumferential Weld WF-562 & Nozzle Shell Forging Limiting ART Values at 32 EFPY l/4T 93°F (N-588) & 67°F ('96 App. G) 3/4T 79°F (N-588) & 54°F ('96 App. G) 2500 *.

2250

,' Leak Test Limit IOper1im Verslon:5.1 Aun: 19017

. j Acceptable 2000 Operation Unacceptable

  • - Operation J

- 1750 I )

CJ Ci)

-... --.. . . . . IJ tI CL 1500 .

CD 1DO Deg. F/Hr r- Crltlcal Limit 100 Deg. F/Hr

~

1250 .

U)

U)

CL

...CD .

_V ~

"Cl CD 1000 . ,..- ...

~

u ca 750 Crltlcallty Limit b ased on lnservlca hydrostatic test 0 -

, temperature (127"F) for the service period up to 32 EFPY 500 .

Boltup Temp 250

!The lower llmlt for RCS 0 ,_ .....- o 1presaura Is psla 0 50 100 150 200 250 300 350 400 450 500 550 Moderator Temperature (Deg. F)

Figure 2.1 Braidwood Unit 2 Reactor Coolant System Heatup Limitations (Heatup Rate of 100°F/hr)

Applicable to 32 EFPY (Without Margins for Instrumentation Errors) 3

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Material Property Basis Limiting Malerial: Circumferential Weld WF-562 & Nozzle Shell Forging Limiting ART Values at 32 EFPY 1/4T 93°F (N-588) & 67°F ('96 App. G) 3/4T 79°F (N-588) & 54°F ('96 App. G) 2500 Oper11m Version:5.1 Run:19017 I f

2250 -

. Unacceptable Operation Acceptable 2000 Operation

- 1750 J CJ Ci5 a.

u 1500 - I

~

,,,en J I

! 1250 -

,Ii a.

"C u

m 1000

~

u

'ii Cooldown Rates

(°F/Hr) steady-state,

  • 25, 0 *50, and 750 *100 500 I

250 I

Boltup Temp. I LJ;rh* lower limit for RCS I

0 - - -

I pressure lso psla I

0 50 100 150 200 250 300 350 400 450 500 550 Moderator Temperature (Deg. F)

Figure 2.2 Braidwood Unit 2 Reactor Coolant System Cooldown Limitations (Cooldown Rates of O, 25, 50 and 100°F/hr) Applicable to 32 EFPY (Without Margins of Instrumentation Errors) 4

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.la Braidwood Unit 2 Heatup Data Points at 32 EFPY (Without Margins for Instrumentation Errors)

Heatup Curve 100 F Heatup Criticality Limit Leak Test Limit T (°F) P (psig) T (°F) P (psig) T ("F) P (psig) 60 Note I 127 Note I 110 2000 60 924 127 965 127 2485 65 965 127 977*

70 977 127 977 75 977 127 981 80 977 130 990 85 981 135 1005 90 990 140 1025 95 1005 145 1051 100 1025 150 1081 105 1051 155 1118 110 1081 160 1161 115 1118 165 1210 120 1161 170 1266 125 1210 175 1329 130 1266 180 1400 135 1329 185 1480 140 1400 190 1569 145 1480 195 1668 150 1569 200 1778 155 1668 205 1901 160 1778 210 2036 165 1901 215 2186 170 2036 220 2353 175 2186 180 2353

  • Refer to Reference l3 Note 1: The Minimum acceptable pressure is 0 psia 5

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 2.lb Braidwood Unit 2 Cooldown Data at 32 EFPY (Without Margins for Instrumentation Errors)

Cooldown Curves Steady State 25 °F Cooldown 50 °F Cooldown I00 °F Cooldown T ("F) P (psig) T (°F) P (psig) T (°F) P (psig) T (°F) P (psig) 60 Note I 60 Note I 60 Note I 60 Note 1 60 931 60 908 60 889 60 866 65 965 65 946 65 932 65 921 70 1003 70 989 70 980 70 980 75 1045 75 1036 75 1033 75 1033 80 1092 80 1088 80 l088 80 1088 85 1143 85 1143 85 1143 85 1143 90 1200 90 1200 90 1200 90 1200 95 1263 95 1263 95 1263 95 1263 100 1332 100 1332 too 1332 100 1332

!05 1409 !05 1409 l05 1409 105 1409 110 1494 110 1494 110 1494 110 1494 115 1587 115 1587 115 1587 115 1587 120 1691 120 1691 120 1691 120 1691 125 1805 125 1805 125 1805 125 1805 130 1932 130 1932 130 1932 130 1932 135 2071 135 2071 135 2071 135 2071 140 2226 140 2226 140 2226 140 2226 145 2396 145 2396 145 2396 145 2396 Note 1: The Minimum acceptable pressure is 0 psia 6

BRAIDWOOD~ UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 3.0 Low Temperature Overpressure Protection and Boltup This section provides the Braidwood Unit 2 power operated relief valve lift settings, low temperature overpressure protection (LTOP) system arming temperature, and minimum reactor vessel boltup tempemture.

3.1 LTOP System Setpoints (LCO 3.4.12).

The power operated relief valves (PORVs) shall each have nominal lift settings in accordance with Figure 3.1 and Table 3.1. These limits are based on References 3 and 8.

The LTOP setpoints are based on Pff limits that were established in accordance with IO CFR 50, Appendix G without allowance for instrumentation error. The LTOP setpoints were developed using the methodology described in Reference

1. The LTOP PORV nominal lift settings shown in Figure 3.1 and Table 3.1 account for appropriate instrument error.

3.2 LTOP Enable Temperature Braidwood Unit 2 procedures governing the heatup and cooldown of the RCS require the arming of the LTOP System for RCS temperature of 350°F and below and disarming of LTOP for RCS temperature above 350°F.

Note that the last LTOP PORV segment in Table 3.1 extends to 400°F where the pressure setpoint is 2335 psig. This is intended to prohibit PORV lift for an inadvertent LTOP system arming at power.

3.3 Reactor Vessel Boltup Temperature (Non-Technical Specification)

The minimum boltup temperature for the Reactor Vessel Flange shall be~ 60°F.

Boltup is a condition in which the Reactor Vessel head is installed with tension applied to any stud, and with the RCS vented to atmosphere.

7

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 2500 I i33Spslg 2250 2000 I

m;o I 8

ill Q.

i tiSOO I

i Q.

1250 Unocceplable Operation I

a:

0 Q.

l 1000 I

  • e

~

639 psig PCV456

! I I

599pelg '\.

" PCV455A 0

0 100 150 200 250 300 350 400 Auctlon. .red Low RCS Temp1mure IDEG. F)

Figure 3.1 Braidwood Unit 2 Nominal PORV Setpoints for the Low Temperature Overpressure Protection (LTOP) System Applicable for 32 EFPY (Includes Instrumentation Uncertainty) 8

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 3.1 Data Points for Braidwood Unit 2 Nominal PORV Setpoints for the LTOP System Applicable for 32 EFPY (Includes Instrumentation Uncertainty)

PCV-455A PCV-456 RCS TEMP. RCS Pressure RCS TEMP. RCS Pressure (DEG. F) (PSIG) (DEG. F) (PSIG) 60 599 60 639 300 599 300 639 400 2335 400 2335 Note: To determine nominal lift setpoints for RCS Pressure and RCS Temperatures greater than 300°F, linearly interpolate between the 300°F and 400°F data points shown above. (Setpoints extend to 400°F to prevent PORV liftoff from an inadvertent LTOP system arming while at power).

9

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 4.0 Reactor Vessel Material Surveillance Program The pressure vessel material surveillance program (Reference 4) is in compliance with Appendix H to 10 CFR 50, "Reactor Vessel Radiation Surveillance Program." The material test requirements and the acceptance standards utilize the reference nil-ductility temperature, RTNOT, which is determined in accordance with ASME Boiler and Pressure Vessel Code,Section III, NB-2331.

The empirical relationship between RT NOT and the fracture toughness of the reactor vessel steel is developed in accordance with Appendix G, "Protection Against Non-Ductile Failure," to Section XI of the ASME Boiler and Pressure Vessel Code. The surveillance capsule removal schedule meets the requirements of ASTM E 185-82.

The third and final reactor vessel material irradiation surveillance specimens (Capsule W) have been removed and analyzed to determine changes in material properties. The surveillance capsule testing has been completed for the original operating period. The remaining three capsules, V, Y, and Z, were removed and placed in the spent fuel pool to avoid excessive fluence accumulation should they be needed to support life extension. The removal summary is provided in Table4.1.

IO

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 4.1 Braidwood Unit 2 Capsule Withdrawal Summary'0 >

Capsule Fluence Capsule Lead Factor Withdrawal EFPY<">

Location (n/cm2, E>l.O MeV) u 58.5° 4.08 l.18 0 .388 x 10 19 x 238.5° 4.03 4.24 1.15 x 10 19 w 121.5° 4.06 8.56 2.07 x 1019 zCc) 301.5° 4.14 12.78 (EOC 10) 2.83 x 10 19 y(c) 61.0° 3.92 18.42 (EOC 14) 3.73 x 1019 y<c> 241 .0° 3.89 12.78 (EOC 10) 2.66 x 1019 Notes:

(a) Source document is CN-AMLRS-10-7 (Reference 14), Table 5.7-4.

(b) Effective Full Power Years (EFPY) from plant startup.

(c) Standby Capsules Z, V, and Y were removed and placed in the spent fuel pool. No testing or analysis has been performed on these capsules. If license renewal is sought, one of these standby capsules may need to be tested to detennine the effect of neulron irradiation on the reactor vessel surveillance materials during the period of extended operation.

11

BRAIDWOOD* UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 5.0 Supplemental Data Tables The following tables provide supplemental information on reactor vessel material properties and are provided to be consistent with Generic Letter 96-03.

Some of the material property values shown were used as inputs to the Pff limits.

Table 5.1 shows the calculation of the surveillance material chemistry factors using surveillance capsule data.

Table 5.2 provides the reactor vessel material properties table.

Table 5.3 provides a summary of the Braidwood Unit 2 adjusted reference temperature (ART) values at the l/4T and 3/4T locations for 32 EFPY.

Table 5.4 shows the calculation of ARTs at 32 EFPY for the limiting Braidwood Unit 2 reactor vessel material.

Table 5.5 provides the RTPTS Calculation for Braidwood Unit 2 Beltline Region Materials at EOL (32 EFPY), (Reference 6).

12

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.1 Braidwood Unit 2 Calculation of Chemistry Factors Using Surveillance Capsule Data<0 >

Capsule rb1 ARTNDT(b) FF*ARTNDT Material Capsule FF<cl FF2 (n/cm1, E > 1.0 MeV) (oF) (oF)

Lower Shell u 0.388 x 1019 0.738 o.o<d1 0.00 0.54 Forging x 1.15 x 1019 1.039 o.o<d> 0.00 1.08 (Tangential) w 2.07 x 10 19 1.198 4.53 5.43 1.44 u 0.388 x 1019 0.738 o.o<d1 0.00 0.54 Lower Shell Forging x 1.15 x rn 19 1.039 33.94 35.26 1.08 (Axial) w 2.07 x 1019 1.198 33.2 39.78 1.44 SUM: 80.47 6.12 CF LS Forging= L(FF *ARTNO'T) + :E(FF2) = (80.47) + (6.12) = 13.2°F Braidwood Unit I u 0.388 x rn 19 0.738 17.06 12.59 0.54 Surveillance Weld x 1.17 x 10 19 1.044 30.15 31.47 1.09 Material w 1.98 x 1019 1.186 49.68 58.94 1.41 Braidwood Unit 2 u 0.388 x 10 19 0.738 o.o<d> 0.00 0.54 Surveillance Weld x 1.15 x 10 19 1.039 26.3 27.33 1.08 Material w 2.07 x 10 19 1.198 23.9 28.63 1.44 SUM: 158.96 6.10 CF Weld Mew= L(FF *ARTNor)+ L(FF2) = (158.96) + (6.IO) = 26.PF Notes:

(a) Source document is CN-AMLRS-10-7 (Reference 14), Table 5.2-2.

(b) f= fluence; ARTNDT values are the measured 30 ft-lb shift values taken from Reference 5.

(c) FF= fluence faclor =(0*28

  • o.io*ioa 0 (d) Measured ARTNDT values were determined to be negative, but physically a reduction should not occur; therefore, conservative values of zero are used.

13

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.2 Braidwood Unit 2 Reactor Vessel Material Properties Chemistry Initial Material Description Cu(%) Ni(%) RT NDT (°F)(o)

Factor Closure Head Flange Heat# 3P6566/5P7547/4P6986 -- 0.75 -- 20 Serial# 2031-V-1 Vessel Flange Heat # 124P455 0.07 0.70 -- 20 Nozzle Shell Forging

  • 26.0°Fbl 0.04 0.90 30 Heat # SP-7056 lntennediate Shell Forging
  • 20.0°Fb)

Heat # [49D963/49C904] 1 0.03 0.71 -30 0

Lower Shell Forging

  • 37.0°F '

0.06 0.76 13.2°Fc) -30 Heat# [500102/50C97]-l-l Circumferential Weld *

(Intermediate Shell to Lower Shell) 41.opb>

Weld Seam WF-562 0.03 0.67 26.lFc> 40 Heat# 442011 Circumferential Weld*

(Nozzle Shell to Intermediate Shell) 0.04 0.46 54.0°phl -25 Weld Seam WF-645 Heat#H4498

  • Beltline Region Materials a) The Initial RTNOT values for the plates and welds are based on measured data.

b) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 1.1.

c) Chemistry Factor calculated for Cu and Ni values per Regulatory Guide 1.99, Rev. 2, Position 2.1 14

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT

.Table 5.3 Summary of Braidwood Unit 2 Adjusted Reference Temperature (ART) Values at l/4T and 3/4T Locations for 32 EFPv**>

Surface Fluence 32EFPY Reactor Vessel Material (n/crn 2, E>l.O MeV) l/4T ART (°F) 3/4T ART (°F) 19 Nozzle Shell Forging 0 .559 x 10 66 54 19 Intermediate Shell Forging 1.73 x 10 JO -I 19 Lower Shell Forging 1.73 x 10 41 24

-+Using non-credible surveillance data 1.73 x 10 19 -3 -1 l Nozzle lo Intermediate Shell Forging Circ. Weld Seam 0.559x 1019 51 24 (Heat # H4498)

Intermediate to Lower Shell Forging Circ. Weld Seam 1.67 x 1019 122 99 (Heat# 442011)

-+Using credible surveillance data 1.67 x 10 19 92 78 Notes:

(a) The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14),

Tables 5.3.1-3 and 5.3. 1-4. The ART values summarized in this table utilize the most recent lluence projections and materials data, but were not used in development of the Prr limit curves.

See Figures 2.1 and 2.2 of this PTLR for the ART values used in development of the Pff limit curves.

15

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.4 Braidwood Unit 2 Calculation of Adjusted Reference Temperatures (ARTs) at 32 EFPY at the Limiting Reactor Vessel Material, Nozzle Shell Forging SP-7056 Parameter Values Operating Time 32 EFPY Location~ai l/4T ART (°F) 3/4T ART(0 F)

Chemistry Factor, CF (°F) 26.0 26.0 Fluence(f), n/cm..:

3.40xl0 18 l.23xl018 (E>l.0 Mevib>

Fluence Factor, FF 0.703 0.460 ARTNor- CFxFF(°F) 18.3 12.0 Initial RT NOT.* 1(°F) 30 30 Marl?in, M(°F) 18.3 12.0 ART= I+(CF*FF)+M, °F 67 54 per RO l.99, Revision 2 a) The Braidwood Unit 2 reactor vessel wall thickness is 8.5 inches at the beltline region.

18 b) Fluence, f, is the calculated peak clad/base metal interface fluencc (E>l.0 Mev) =5.67xl0 n/cm2 at 32 EFPY (Reference 11).

16

BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT Table 5.5 RTPTS Calculation for Braidwood Unit 2 Beltline Region Materials at EOL (32 EFPYia.b)

R.G.1.99, IRTNDT<c) al
l.O MeV) (oF) (of) (OF) (OF) (Of) (oF) Position Nozzle Shell Forging 1.1 26 0.559 x 1019 0.8373 30 21.8 0 10.9 21.8 74 Intermediate Shell Forging I.I 20 1.73 x 1019 1.1508 -30 23.0 0 11.5 23.0 16 19 Lower Shell Forging l.l 37 l.73x 10 1.1508 -30 42.6 0 17 34 47 -Using non-credible surveillance data 2.l 13.2 1.73 x 1019 1.1508 -30 15.2 0 7.6 15.2 0 Nozzle to Intermediate Shell Forging Circ. Weld Seam 1.1 54 0.559x 1019 0.8373 -25 45.2 0 22.6 45.2 65 (Heal # H4498) Intermediate 10 Lower Shell Forging Circ. Weld Seam 1.1 41 1.67 x 1019 1.1413 40 46.8 0 23.4 46.8 134 (Heal # 442011) -Using credible surveillance data 2.1 26.l 1.67 x 1019 l.1413 40 29.8 0 14 28 98 ~: (a) The 10 CFR 50.61 methodology was utilized in the calculation of the RT!"TS values. (b) The source document containing detailed calculations is CN-AMLRS-10-7 (Reference 14), Table 5.5-2. (c) Initial RTNOT values are based on measured data. Hence, Gu= 0°F. (d) Per the guidance of 10 CFR 50.61, the base metal aA = 17°F for Position 1.1 (without surveillance data) and for Position 2. 1 with non-credible surveillance data; the weld metal GA= 28°F for Position I.I (without surveillance data) and with credible surveillance data GA= 14°F for Position 2.1. However, a A need not exceed O.S*aRTNDT* 17 BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT 6.0 References
1. WCAP-14040-NP-A, Revision 2, "Methodology Used to Develop Cold Overpressure Mitigating System Setpoints and RCS Heatup and Cooldown Limit Curves", J.D.
Andrachek, et al., January 1996.
2. NRC Letter from R. A. Capra to O.D. Kingsley, Commonwealth Edison Company, "Byron Station Units 1 and 2 and Braidwood Station Units 1 and 2, Acceptance for referring of pressure temperature limits report, (M98799, M98800, M98801, and M98802)," January 21, 1998.
3. Westinghouse Letter to Exelon Nuclear, CAE-10-MUR-197, Revision 0, "Low Temperature Overpressure Protection (LTOP) System Evaluation Final Letter Report,"
M.P. Rudakewiz, September 8, 2010.
4. WCAP-11188, "Commonwealth Edison Company, Braidwood Station Unit 2 Reactor Vessel Surveillance Program," December 1986.
5. WCAP-15369, "Analysis of Capsule W from the Commonwealth Edison Company Braidwood Unit 2 Reactor Vessel Radiation Surveillance Program," March 2000.
6. WCAP-15381, "Evaluation of Pressurized Thermal Shock for Braidwood Unit 2", T.J.
Laubham, September 2000.
7. NRC Letter from G. F. Dick, Jr., NRR, to C. Crane, Exelon Generation Company, LLC, "Issuance of Amendments: Revised Pressure-Temperature Limits Methodology; Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2," dated October 4, 2004.
8. Byron & Braidwood Design Information Transmittal DIT-BRW-2006-0051, "Transmittal of Braidwood Unit l and Unit 2 Temperature and Pressure Uncertainties for Low Temperature Overpressure System (LTOPS) Power Operated Relief Valves (PORVS)," Nathan (Joe) Wolff Jr., July 18, 2006.
9. NRC Letter from M. Chawla to O.D. Kingsley, Exelon Generation Company, LLC, "Issuance of exemption from the Requirements of 10 CFR 50 Part 60 and Appendix G for Byron Station, Units 1 and 2, and Braidwood Stations, Units 1 and 2," dated August 8, 2001.
10. NRC Letter from R. F. Kuntz, NRR, to C. M. Crane, Exelon Generation Company, LLC, "Byron Station, Unit Nos. 1 and 2, and Braidwood Station, Unit Nos. 1 and 2 -
Issuance of Amendments Re: Reactor Coolant System Pressure and Temperature Limits Report (TAC Nos. MC8693, MC8694, MC8695, and MC8696)," November 27, 2006.
11. WCAP- 15373, Revision 2, "Braidwood Unit 2 Heatup and Cooldown Limits for Normal Operation," T.J. Laubham et al., November 2003.
18 BRAIDWOOD - UNIT 2 PRESSURE AND TEMPERATURE LIMITS REPORT
12. WCAP-16143-P, Revision l, ..Reactor Vessel Closure Head/Vessel Flange Requirements Evaluation for Byron/Braidwood Units 1 and 2," W. Bamford, et al.,
October 2014.
13. Westinghouse Letter to Exelon Nuclear, CCE-07-24, ..Braidwood Unit 1and2 RCS HU/CD Limit Curve Table Values," dated February 15, 2007.
14. Westinghouse Calculation Note CN-AMLRS-10-7, Revision O. "Braidwood Units I and 2 Measurement Uncertainty Recapture (MURJ Uprate: Reactor Vessel Integrity Evaluations." A.E. Leicht, September 2010, and Westinghouse evaluation MCOE-LTR-13-102 Rev. 0, ..Byron and Braidwood Closure Head/Vessel Flange Region: MUR Uprate Assessment," November 2013.
l9
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