ML20099A697

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10CFR50.46 Margin Utilization Byron & Braidwood Station, Units 1 & 2, Constituting Annual Rept of Results of ECCS Evaluation Models for Period Ending 910725
ML20099A697
Person / Time
Site: Byron, Braidwood  Constellation icon.png
Issue date: 07/25/1991
From:
COMMONWEALTH EDISON CO.
To:
Shared Package
ML20099A687 List:
References
NUDOCS 9207290356
Download: ML20099A697 (6)


Text

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ATTACHMENT 1 10CFR50.46 -

MARGIN UTLIZIATION BYRON AND BRAIDWOOD STATION UNITS 1 and 2

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ATTACHMENT 1

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BYRON 1 LARGE BREAK LOCA 10CF.30.46 MARGIN UTILIZATION Page 1 of 5 PLANT NAME: B1R0lLSIAII0tLUHIL1 UTILITY NAME: COMMONWEALTH EDISON A. ANALYSIS OF RECORD PCT. 18B3107'F (Comments: Calc-Note No.__SEC-SAll-3152-CD Evaluation Model: BASH __, FQT.2.50_, FdH.ldS.

SGTP . 15 1., Other: )

B. PRIOR LOCA MODEL ASSESSMENTS --1989 .

APCT. + 0'F (Permanent Assessment of PCT Margin - Letter #: CAE-90-314 1 C. nRIOR LOCA MODEL ASSESSMENTS - 1990 APCT. + 0*F (Permanent Assessment of PCT Margin - Letter #: CAE-91-135 )

D. -CURRENT LOCA MODEL ASSESSMENTS - 06/1991 (Permanent Assessment of PCT Margin)

1. FUEL ROD INITIAL CONDITION INCONSISTENCY APCT. + _LO'F
2. LB-LOCA BURST & BLOCKAGE ASSUMPTION APCT. + 0*F
3. SG TUBE SEISMIC /LOCA ASSUMPTION APCT. + 7,2*F E. 10CFR50.59 SAFETY EVALUATIONS - (Permanent Assessment of PCT Margin)
1. Letter: NOTE 1 Issue: ERLOR TO 1990 APCT. + 1*F 2, Letter: Issue: APCT. 'F F. OTHER. MARGIN ALLOCATIONS-(Temporary Use of PCT Margin):
1. ANALYSIS MARGINS USED: VANTAGE 5 TRANSIUQN (NOTE 21 APCT. + 50*F i 2. PLANT:MAPGINS USED: N/A APCT. *F
3. FUEL MARGINS USED: LB-LQCA_P_0HELDIST. G0lL3)_ APCT._t___100*F LICENSING BASIS PCT + MARGIN ALLOCATION APCT. 2051.3*F

-Hotal:

/ -- _1 . This penalty resulted from an evaluation of the containment mini-purge valve as' discussed in UFSAR Sect. 6.2.1.5.

2. The transition core penalty for 17x17 Vantage 5 fuel is addressed in NCAP 10444-P-A.

3-. A temporary PCT penalty of 100*F was applied beginning in August 1990 to bound the potential PCT impact associated with the adequacy of the assumed

. power shape (chopped cosine) for the LBLOCA initial condition.

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ATTACHMENT 1 BRAIDHOOD 1 LARGE BREAK LOCA

-10CFR50.46 MARGIN UTILIZATION Page 2 of 5 PLANT NAME: BRAIDB000_SIAIl0tLUNIT 1 UTILITY NAME: COBM0MEALIB_ EDISON A. - ANALYSIS OF RECORD PCT.__lBB1102*F (Comments: Calc-Note No._ SEC-SA11 3151-C0 Evaluation Model: BASH , FQT.L30_, FdH.L15, SGTP . 15 %, Other: )

B. PRIOR LOCA MODEL ASSESSMENTS-- 1989 APCT. + 0'F .

(Permanent Assessment of PCT Margin - Letter #: CAE SD:314 1 aPCT. + 0*F C, PRIOR LOCA MODEL ASSESSMENTS -_1990 (Permanent Assessment of PCT Margin-- Letter #: CAE 21 J35 )

D. CURRENT LOCA MODEL ASSESSMENTS - 06/1991 (Permanent Assessment of PCT Margin)

1. FUEL R0D INITIAL CONDITION. INCONSISTENCY APCT. + 10*F
2. 'LB-LOCA BURST & BLOCKAGE ASSUMPTION APCT. + 0*F
3. SG TUBE SEISMIC /LOCA ASSUMPTION APCT. + 7.2*F E. 10CFR50.59 SAFETY EVALUATIONS _(Permanent Assessment of PCT Margin)
1. Letter: MQIE 1 Issue: f3LQR_IQ_1920 APCT. + 1*F
2. Letter: SECL-91-188D Issue: MISSING GRIQ_EIECE APCT. + 17'F F. OTHER MARGIN ALLOCATIONS (Temporary Use of PCT Margin):
1. ANALYSIS MARGINS USED: VANTAGE S TRANSIIloti._OLOIE_21 APCT._t SD*F
2. PLANT MARGINS USED: N/A APCT. ___ F
3. FUEL MARGINS USED: LB LOCA POWER DISTR. (NOTE 3) APCT. + 100*F LICENSING BASIS PCT + MARGIN ALLOCATION APCT= 2068.3*F.

Notes' L 1. This penalty resulted from an evaluation of the containment mini-purge valve as discussed in UFSAR Sect. 6.2.1.5.

'2. .The transition core penalty for 17x17 Vantage 5 fuel is addressed in HCAP'10444-P-A.

3. A temporary PCT penalty of 100*F was applied beginning in August 1990 to bound'the potential PCT impact associated with the adequacy of the assumed; power shape (chopped cosine) for the.LBLOCA initial condition.

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ATTACHMENT 1 BYRON 2/BRAIDH000 2 LARGE BREAK LOCA 10CFR50.46 MARGIN UTILIZATION Page 3 of 5 PLANT NAME: SYAON_SIAIION_VNIllLERAI DH00DESIAIIONJLNIll UTILITY NAME: COMMONNEALTH EDISON i

A. ~ ANALYSIS OF RECORD PCT.__lBH110Z*F (Comments: _Cale-Note No. SEC-SAII:1157-C0 Evaluation Model: RASH , FQT.L._5Q_, FdH.lt63, SGTP ._15__%, Other: )

B. PRIOR LOCA MODEL ASSESSMENTS - 1989- APCT. + 0*F (Permanent Assessment of PCT Margin - Letter #: CAE-9.0-J14/CCE-9.0-3091 C. PRIOR LOCA MODEL ASSESSMENTS - 1990 APCT. + 0*F (Permanent Assessment of PCT Margin - Letter #: C&E-91-131/CCE-91-13hl D. CURRENT LOCA MODEL ASSESSMENTS - 06/1991 (Permanent Assessment of: PCT Margin)

1. FUEL ROD INITIAL CONDITION INCONSISTENCY APCT= + IQ'F
2. LB-LOCA BURST & BLOCKAGE _ ASSUMPTION APCT. + 0'F
3. SG TUBE SEISMIC /LOCA ASSUMPTION APCT. + 20'F E. 10CFR50.59 SAFETY EVALUATIONS - (Permanent Assessment of PCT Margin)
11. Letter: NOTE 1 Issue: PRIOR TO 1990 APCT. + 1*F
2. Letter: Issue: APCT. 'F F. OTHER MARGIN ALLOCATIONS-(Temporary Use of PCT Margin):
1. - ANALYSIS MARGINS USED: VANTAGE 5 TRANSITION (NOTE 21 APCT. + 50*F

_2. PLANT MARGINS USED: N/A APCT. 'F

3. FUEL MARGINS USED: LB-LOCA POWER DISTR. (NOTE 31 APCT. + 100*F LICENSING BASIS PCT + MARGIN ALLOCATION APCT.__l01Ll* F N0115:
1. This penalty resulted from an evaluation of the sontainment mini-purge valve as discussed in UFSAR Sect. 6.2.1.5.
2. The transition core penalty for 17x17 Vantage 5 fuel is addressed in NCAP 10444-P-A.-
3. A temporary PCT penalty of 100*F was applied beginning in August 1990 to bound the potential PCT impact associated with the_ adequacy of the assumed power shape (chopped cosine) for the_LBLOCA initial condition.

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ATTACHMENT 1 BYRON 1,2/BRAIDH000 2 SMALL BREAK'LOCA 10CFR50.46 MARGIN UTILIZATION Page 4 of S PLANT N ME: EiRON_ SI AU 0H_V NIISilL2B1mI DH00D_SIA110R_U NII_2 UTILITY NAME: C0tfj0MBEALULIDIS0N A. ANALYSIS OF. RECORD PCT. 145321*F (Comments: Cale-Note No._ SEC-SAI.I-3173-CQ_ _

Evaluation Model: NOIRUMP, FQT.2,50_, FdH. L65, SGlP _1_5 %, Other: )

8. PRIOR LOCA MODEL AaSESSMENTS - 1989 APCT. + 0*F (Permanent Assessment of PCT Margin - Letter #: CAE-9_0-314LCCE-20-3Q91 C. PRIOR LOCA MODEL ASSESSMENTS - 1990 APCT- + Q*F (Permanent. Assessment of PCT Margin - Letter #: C8E-91-135LCCE-11-llfil-D. CURRENT LOCA MODEL ASSESSMENTS - 06/1991 (Permanent Assessment of PCT Margin)
1. FUEL ROD INITIAL CONDITION INCONSISTENCY APCT. + 32*F
2. NOTRUMP SOLUTION CONVERGENCE RELIABILITY APCT. + 0*F
3. SB-LOCA ROD INTERNAL PRESSURE ASSUMPTION APCT. 4 0*F E. 10CFR50.59 SAFETY EVALUATIONS - (Permanent Assessment of PCT Margin)
1. Letter: Issue: APCT. 'F
2. Letter: Issue: APCT. 'F F. OTHER MARGIN ALLOCATIONS (Temporary Use'of PCT Margin):
1. ANALYSIS MARGINS USED: .N/A APCT. *F
. 2. ' PLANT MARGINS USED: HHSI SURV. (NOTE 1) APCT. + 20*F j- a. FUEL MARGINS USED: N/A APCT. *F

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LICENSING BASIS PCT.+ MARGIN ALLOCATION APCT. _ 1510,1*F Boles:

l '. A temporary PCT penalty of no more.than~20*F was assessed by Westinghouse -

l_ (SECL-90-01S) in support.of a potential change to the charging pump.

surveillance acceptance limit. This proposed change is still under review and has not yet been submitted for NRC approval. The SBLOCA penalty would L result from a slight reduction in delivered SI under spilling line conditions between 1400 psia and 1000 psia RCS pressure.

DRR:kab ZKAB:27:6-1 - . .-. - ~ . - .

ATTACHMENT 1

-BRAIDH000 1 SMALL BREAK LOCA 10CFR50.46 MARGIN UTILIZATION Page 5 of 5 PLANT NAME: -- BBA10HQQD_SIA110N._ UNIT 1 UTILITY NAME: C0fiM0EBEALTH EDISON A. ANALYSIS ')F . RECORD PCT. 14 ell

- SGTP ._11_J., Oiher : )

B. PRIOR LOCA MODEL ASSESSMENTS - 1989 APCT. + 0*F L (Permanent Assessment of
PCT Margin - Letter #: CCE 9.0-309 .)

l-l- C. PRIOR LOCA MODEL ASSESSMENTS - 1990 APCT. + 0*F (Permanent Assessment of PCT Margin - Letter #:

CCE_91-136 1

- D.~ CURRENT LOCA MODEL ASSESSMENTS - 06/1991

! (Permanent Assessment-of PCT Margin)

1. FUEL ROD INITIAL CONDITION INCONSISTENCY APCT. + 3Z*F
2. NOTRUMP SOLUTION CONVERGENCE RELIABILITY APCT. + 0*F
3. SB-LOCA R0D INTERNAL PRESSURE ASSUMPTION APCT. + 0*F l E. 10CFR50.59 SAFETY _ EVALUATIONS - (Permanent Assessment of PCT Margin)
1. Letter: SECL-91-188.Q Issue: MISSING GRID PIECE APCT. + 17*F L 2. Letter: Issue: APCT. *F l

F. OTHER MARGIN ALLOCATIONS (Temporary Use of PCT Margin):

1. ANALYSIS MARGINS USED: N/A- APCT. *F

-2. PLANT MARGINS USED:

HHSI SURV. (NOTE i) APCT. + 20*F

3. FUEL MARGINS'USED: N/A APCT. *F LICENSING BASIS PCT ( MARGIN ALLOCATION APCT. 152Ll*F Notes:

! 1. A temporary PCT penalty of no more than 20*F was assessed by Westinghouse l (SECL-90-015) in support of a potential change to the charging pump L surveillance acceptance limit. This proposed change it still under review and has not yet been submitted for NRC approval. The SBLOCA penalty would result from a slight reduction in delivered SI under spilling line conditions between 1400 psia and 1000 psia RCS pressure, b

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