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)
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Text

'

ATTACHMENT 1 10CFR50.46 MARGIN UTLIZIATION BYRON AND BRAIDWOOD STATION UNITS 1 and 2

=.

~-

ATTACHMENT 1

~*

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.

l L

l DRR:kab ZKAC:27:3

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

C, PRIOR LOCA MODEL ASSESSMENTS -_1990 aPCT. +

0*F (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.

i.

L l

l l

l r

DRR:kab ZKAB:27:4

.=-

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.

i i

DRR:kab ZKAB:27:5

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

'~

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 2.

Letter:

Issue:

APCT.

  • F L

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

i l.

DRR:kab ZKAB:27:7

,,,

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