ML20085K234

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Provides Response to Request for Addl Info Re Generic Ltr 88-11, NRC Position on Radiation Embrittlement of Reactor Vessel Matl & Impact on Plant Operations
ML20085K234
Person / Time
Site: Browns Ferry  
Issue date: 10/24/1991
From: Zeringue O
TENNESSEE VALLEY AUTHORITY
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
GL-88-11, TVA-BFN-TS-293, NUDOCS 9110300237
Download: ML20085K234 (8)
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TVA-BFN-T2-293 10 CFR 50.90 00T 2 4 Mt U.S

.';uclear Regulatory Commission i

ATTN: Document Control Desk Washington, D.C.

20555 Gentlemen:

In the Matter of

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Docket Nos. 50-259 Tennessee Valley Authority

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50-260 59-296 BROWNS FERRY NUCLEAR PLANT (BFN) - TVA BFN TECHNICAL SPECIFICATION (TS)

NO. 293 - RADIATION EMBRITTLEMENT OF REAC'.OR VESSEL MATERIAL AND ITS INPACT ON PLANT OPERATIONS - RESPONSE TO REQUEST FOR ADDITION!.L INFORMATION

Reference:

Ceneric Letter 88-11, dated July 12, 1988, "NRC Position on Radiation Embrittlement of Reactor Vessel Material and Its Impact on Plant Operations" By correspondence dated July 19, 1991, TVA submitted a request for TS amendment to revise the pressure / temperature limit curves to make them consistent with the guidance contained in the reference.

By correspondence dated August 28, 1991, NRC transmitted a request for additional information. The enclosure providea the information requested by the Staff.

There are no commitments contained in this correspondence.

If there any questions about this rtsponse, please telephone Patrick P. Carier at (205) 729-7566.

Sincerely, n

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O'. J. Zeringue

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7110300237 5'11UN

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PDR ADOCK 05000259 P

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U.S. Nuclear Regulatory Commission OCT 2 41991 Enclosure cc (Enclosure):

American Nuclear Insurers Attention: Librarian The Exchange, Suite 245 270 Farmington Avenue Farmington, Connecticut 06032 Mr. Johnny Black, Chairman Limestone County Commission 310 Washington Street Athens, Alabama 35611 Dr. C. E. Fox State Health Officer State Department of Public Health State Office Building Montgomery, Alabama 36194 Mr. J. E. Jones General Electric Company 735 Broad Street Suite 1108 James Building Chattanooga, Tennessee 37402 NRC Resident Inspector Brovns Ferry Nuclear Plant Route 12, Box 637 Athens, Alabama 35609-2000 Mr. Thierry M. Ross, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Mr. B. A. Wilson, Project Chief U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 e

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REOUESTED ADDITIONAL INFORMATIQH 1.

Number of Effective Full Power Years (EFPY) to End of Life (EOL)

EFPY at Time of Remaining Availability EPPY

= at EOL Extended Outanes +

Years X

Factor 23.94 Unit 1 6.14 (EOC 6) 22.25

.80

=

23.74 Unit 2 5.54 (EOC 5) 22.75

.80

=

24.48 Unit 3 4.6G (EOC 4) 24.75

.80

=

2.

ygssel Beltline Thickness (inches)

Unit 1 Unit 2 Unit 3 Base Metal 6.125 min 6.125 min 6.125 min Cladding 0.125 min 0.125 min 0.125 min Vessel Inside Radius at Beltline (inchegl Unid Unit 2 Uni G -

125.5 125.5 125.5 Neutron #

9e (n/cm2. E > 1 mer) 1 EPPY 12 EFPY EOL EPPY 17 17 9.36 X 10 Unit 1 3.91 X 1010 4.69 X 10 (2.38 X 1016)*

(2.86 X 1017)* (5.70 X 1017 ).

17 17 16 4.08 X 10 7.93 X 10 Unit 2 3.34 X 10 16 17 8'.03 X 1017 Unit 3 3.28 X 10 3,94 x 19

  • At location of. controlling circumferential sub are weld.

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Base Materials RPV shell courses were fabricated by rolling plate material to contour and velding the plates together with longitudinal seams using electroslag (ES) welding with HiMnMo consumables.

Shell courses were joined together with circumferential velds using automatic submerged arc (ASA) welding to form the final reactor vessel.

For additional information requested on base materials, see attached Tables

]

3-4, 3-5, and 3-6.

Weld Materigig UNIT 1

__ UNIT 2 UNIT 3 ES Weld Flux Linde 124 Linde 124 Linde 124 ES Weld Wire Raco Hi-Mn-Mo Raco Hi-Un-Mo Raco !!i-Mn-Mo Heat or Code No.

Not Available Not Available Not Available ASA Weld Flux Linde 80 YF-200 YF-200 Heat or Code No.

Lot 8720 1210-02037 1325-02037 ASA Weld Wire Union Carbide Y-204 Y-204 (Mn-Mo-M1)

Heat or Code No.

406L44 D55733 D55733 & D51852 i

Additional requested information given in attached Tables 3-A, 3-5, and 3-6.

Limitinn Closure Flange Material UNIT 1

. UNIL2___

UNIT 3 Form Forged ring Forged ring Forged ring

  • lleat or Code No.

A508-2-1332-2 A508-2-1332-2 A508-2-1332-2 10*P 10*F 10*F Unitradiated Rtndt 3.

No Surveillance capsules have been removed from any unit.

  • The limiting closure flange material heat or code number is not available at the present time. The flange material number given is the ASME code case number.

PLLIC201/37/2

Table 3-4.

Browns Ferry Unit 1 Beltline and Surveillance flaterials Data Location Material ID

'IC u TN1 11' RTHD1F US E,* f t-l bs Mk-58 shell-C2868-2 0.09 0.52 0.007 0

144 Mk-58 shell C2884-2 0.12 0.52 0.000 0

118 fik-58 shell C2753-1 0.08 0.50 0.009

-20 120 Mk-58 shell ES weld (3) 0.25 0.35 0.016 0*

  • 95 Circ. weld ASA weld-WF154 0.31 0.59 0.013 420 66 Mk-57 shell A1009-1 0.14 0.50 0.009

-10 120 Mk-57 shell 85864-1 0.15 0.44 0.005

-20 120 Mk-57 shell A0999-1 0.14 0.60 0.010

-20 120 Mk-57 shell ES weld (3) 0.25 0.35 0.016 0

95 Survelllance C2868-2 0.09 0.52 0.007 0

144 Ma terial C2884-2 0.12 0.52 0.008 0

118 IIAZ-C2884-2 0.12 0.52 0.008 0

97 ES weld 0.10 0.30 0.012 0

93

  • Direction of Charpy Specimens - Longitudinal
    • Reevaluated by NRC to be 10*F, based en generic upper bound.

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lahle 3-5.

Drowns l'ersy Uni t 2 Del t1Itie and Surveillance Materials Data

' t.oca tion '

' Material 10 1Cu TN1 iP gg1[,

_USE* f t-lbs Mk-58 shell A0981-1 0.14 O.55 0.007

-10 142 Mk-58 shell C2467-1 0.16 0.52 0.008

-10 120 Mk-58 shell C2849-1 0.11 0.50 0.010

-10 120 Mk-58 shell ES weld (3) 0.25 0.35 0.016 0**

95 Circ. weld ASA weld-055733 0.09 0.65 0.014

-40 145 Mk-57 shell C2467-2 0.16 0.52 0.008

-20 120 Mk-57 shell C2463-1 0.17 0.48 0.000

-20 120 FR-57 shell C2460-2 0.13 0.51 0.012

-20 120 Mk-57 shell ES weld (3) 0.25 0.35 0.016 0

95 Surveillance A0981-1 0.14 0.55 0.007

-10 142 Ma terial itAZ-A0981-1 0.14 0.55 0.007 0

123 ES weld 0.20 0.33 0.010 0

116-

  • Direction of Charpy Specimens - Longitudinal
    • Reevaluated by NRC to be 10*F, based on generic upper bound.

d 3

3-9

Table 3-6.

Browns Ferry Unit 3 8eltline and Surveillance Materials Data location Material 10

%Cu

%Ni

%P ETuniF USE, f t-lbs

.Mk-58 sheli C3188-2 0.10 0.51 0.007

-30 158 Mk-58 shell C3201-2 0.13 0.60 0.007

-30 120 Mk-58 shell 87267-1 0.13 0.51 0.010

-20 120 Mk-58 shell ES weld (3) 0.25 0.35 0.016 0**

95 Circ. weld ASA weld-055733 0.09 0.66 0.013

-40 195 MA-57 shcIl C3213-1 0.13 0.58 0.009

-30 120 Mk-57 shell C3222-2 0.15 0.52 0.015

-20 120 Mk-57 shell C3217-2 0.14 0.66 0.009

-50 120 Mk-57 shell,, ES weld (3) 0.25 0.35 0.016 0

95 Surveillance C3188-2 0.10 0.51 0.007

-30 158 Ma terial llAZ-C 3188-2 0.10 0.51 0.007 0

128 ES wcld 0.11 0.28 0.011 0

124

  • Direction of Charpy Specimens - l~ongitudinal
    • Reevaluated by NKC to be 10*F, based on generic upper bound.

3-10

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