ML20044C331
| ML20044C331 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 03/12/1993 |
| From: | Sieber J DUQUESNE LIGHT CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20044C332 | List: |
| References | |
| TAC-M85081, TAC-M85082, NUDOCS 9303220231 | |
| Download: ML20044C331 (5) | |
Text
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Beaver va ey Power Station i
Shippingport. PA 15077-0004
)
JOHN D. SIEBER (412) 393-5255 Senior Vice Presroent and Fax (412) 643-8009 Chiet Nuclear Officer Nuclear Power Devision March 12, 1992 j
I U.
S. Nuclear Regulatory Commission Attn:
Document Control Desk l
Washington, DC 20555 i
Subject:
Beaver Valley Power Station, Unit No. 1 and No. 2 l
BV-1 Docket No. 50-334, License No. DPR-66 BV-2 Docket No. 50-412, License No. NPF-73 Response to Information Request dated March 1, 1993 l
(TAC Nos..M85081/M85082)
This letter provides a
response to your request for additional i
information regarding proposed Technical Specification Change Request i
No.
205 and 71 submitted by letter dated December 30, 1992.
This information is provided to document the ' responses discussed in a telecon with NRC staff members on March 10, 1993.
The questions-related to sleeving the steam generators using the Westinghouse laser-welding process are stated below followed by our response.
i Item 1 Please confirm that the Westinghouse laser welded free span joint I
will be post weld ~ stress relief heat treated.
Response 1 f
Post weld stress relief is listed as an option-in WCAP-13483, Revision 1.
We have elected to post-weld stress relieve. heat treat all welds.
P 1
Item 2 An expanded discussion is needed of-the."no detrimental effects expected" on the lower tube to tube sheet seal. weld.
[
tl (WCAP-13483, p. 5-12.)
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Response to Information Request dated March 1, 1993 (TAC Nos. M85081/M85082) 4 Page 2 Response 2 A.
Sleeve seal weld for protruding tube:
The seal weld is positioned near the " axial midthickness" of the cladding, providing axial separation from the tube-to-tubesheet (T/TS) weld which is located at the bottom surface of the cladd.ing.
The separation distance between the two welds alleviates concern over damaging the T/TS weld with the laser weld.
Additionally, the T/TS weld is located on j
the tube outside surface; the seal weld penetration on the r
tube is located on the tube inside surface.
B.
Sleeve seal weld for flush or recessed T/TS welds:
l The seal weld for this configuration is also positioned near f
the axial midthickness of the cladding, providing separation from the T/TS weld which is located at the tube end.
The tube end in this case essentially coincides with the 1
cladding bottom surface.
The axial separation.for this configuration also alleviates concern over damaging the T/TS weld with the sleeve seal weld.
l Item 3
]
What is the material specification for the tubes and sleeves, ASME SA-163?
j j
Response 3 j
j Tubes:
ASME SB-163 (Alloy 600)
)
Code Case N-20 (1484-3)
ASME SB-163 (Alloy 690) j l
Item 4 i
i Provide the maximum and minimum dimensions for the outside L
diameter (7/8" O.D. nominal) and wall thicknesses (.050" nominal)-
of the tubes.
l Response 4
- Maximum, Nominal,
- Minimum, i
Dimension Inch Inch Inch OD 0.880 0.875 0.868 Wall Thk O.055 0.050 0.045 a
4
R'esponse to Information Request dated March 1, 1993 (TAC Nos. M85081/M85082)
Page 3 Item 5 Provide the
- maximum, nominal and minimum dimensions for the l
outside diameter and wall thicknesses of the sleeves.
i Response 5
- Maximum, Nominal,
- Minimum, I
Dimension Inch Inch Inch OD 0.745 0.740 0.739 Wall Thk O.042 0.0395 0.037 f
6 Item 6 Provide a
copy of WCAP-12522, "Inconel Alloy 600 Tubing Material Burst and Strength Properties."
Response 6 A copy of the WCAP is attached.
]
1 Item 7 Where did the properties tabulated in Table 3-2 for Alloy 690 i
y.
j come from?
i.e.,
Young's Modulus through Specific Heat and S a.
Section 3.1.10 the sleeve analysis yield strength = 37 ksi and ultimate strength = 91 ksi.
ASME SA-163 Alloy 690 list 40 ksi (Reg Guide 1.85 Rev. 28) ultimate yield strength
=
strength = ?
b.
Are the actual heats known that will be used for the sleeves?
What are the S and S ?
f y
u Response 7
[
t The source is the ASME Code and Code Case N-20, 1986 edition.
a.
The sixth paragraph of Section 3.1.10 of WCAP-13483, l
Revision 1,
discusses the use of lower bound material properties to Code minimum values.
Note that, in-this i
paragraph, the sleeve yield strength of 37.ksi and ultimate strength of 91 ksi are-for 650*F, not room temperature.
We'
.l believe that the above question refers to the Code room temperature value of 40' ksi for yield strength and 80 ksi i
for ultimate strength.
{
f I
l i
?
' Response to Information Request dated March 1, 1993 (TAC Nos. M85081/M85082) 3 Page 4 i
The source of the 37 ksi and 91 ksi values is WCAP-12522.
l The specific reference is to the 37 ksi yield strength and 91 ksi ultimate strength of 11/16 inch diameter thermal treated (TT) tubing found on page 2-4.
Note that WCAP-12522 refers to Alloy 600 tubing strength-(and burst) properties, j
not to Alloy 690 tubing strength properties.
Because the Code assigns equal or higher strength properties to Alloy 690 than to Alloy 600 for the same product form, such as in i
this case of seamless tubes, it is conservative to use Alloy l
600TT lower bound statistical limits (LTL) values for Alloy 690TT sleeve LTL values in the absence of adequate numbers of alloy 690TT test values at elevated temperature.
I b.
There are two heats of sleeves of the Beaver Valley size in the Westinghouse inventory.
There is a turnover of the j
items in inventory so that the length of time that these heats will be available is unknown.
For each heat, two room l
temperature yield strengths are available as follows:
First Heat Second Heat yield strength 48 and 50 53 and 53 (ksi) ultimate strength 103 and 105 104 and 106 (ksi)
Items 8 and 9 No response required per telecon with NRC staff March 10, 1993.
Item 10 Identify which weld width Beaver Valley will be using.
Please provide a
more in-depth discussion of weld width (Section 3.1.13).
What are the trade-offs?
What are the restrictions?-
What forces were considered?
Response 10 The nominal width is 0.040 inch.
However, qualification tests for the weld process have shown that the welds may be as small as 0.015 inch.
- Thus, in performing this analysis, all three weld widths were used.
The stress intensity and fatigue values for the smallest
- width, 0.015 inch,.are acceptable and are reported in Table 3-17 of WCAP-13483, Revision 1.
'Rhsponso to Informntion Request dated March 1,_1993 (TAC Nos. M85081/M85082)
Page 5 If you have any further questions or require additional
.information concerning the
- above, please contact R. N.
Ireland at (412) 393-5251.
k Sincerely,
.e5 J.
D.
Sieber I
cc:
Mr.
L. W. Rossbach, Sr. Resident Inspector Mr.
T. T. Martin, NRC Region I Administrator Mr.
G.
E.
Edison, Project Manager a
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