ML20079B913
| ML20079B913 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 06/11/1991 |
| From: | Devine J GENERAL PUBLIC UTILITIES CORP. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 5000-91-2047, C321-91-2171, NUDOCS 9106180166 | |
| Download: ML20079B913 (9) | |
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GPU Nuclear Corporation NuCIMr One Upper Pond Road Parsippany. New Jersey 07054 201-316-7000 T E LEX 136-4fi2 Wnters Direct Dial Numt>er.
June 11, 1991 5000-91-2047 C321-91-2171 U.
S.
Nuclear Regulatory Conunission Attention Document Control Desk Washington, D.C.
20555 centlemen:
Subjects Oyster Creek Nuclear Generating Station Dockoc No. 50-219 Weld Overlay Repaire Attached are weld overlay repair details for NRC staff information and review.
As a result of inspections performed during our current cycle 13R refueling outage, intergranular stress corrosion crack indications found at four welds were determined to require full structural weld overlay repairs.
The four weld locations include one in Shutdown Cooling System piping (NU-3-5) and three in Core Spray System piping (NZ-3-43, 44 and 95).
j Very truly yours,
//f'
_ o
/
J.
C.
DeVine, Jr.
Vice President and Director Technical Functions JCD/PFC/amk Attachment cc: Administrator, Region I Mr. Alex Dromerick, NRC Project Manager NRC Resident Inspector h,
9106180166 010611 g
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GPU Nuclear Corporation is e subsidiary of General Public Utilitics Corporation
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lable 1 Overlay Design Analysis PLANT ID:
OYSTER CREEK WELD ID:
NV.3 5 PIPE THICKNESS - 0.76 INCH PIPE DIAMETER - 14.00 INCH w
PRIMARY STRESSES:
PRESSURE 5.87 KSI DEAD WEIGHT MEMBRANE - 0.00 KSI DEAD VEIGHT 3ENDING 1.65 KSI SEISMIC MEKBRANE 0.00 KSI SEISMIC BENDING 0.21 KSI SM WELD MATERIAL
- 16.95 KSI SM PIPE MATERIAL
= 16,95 KSI T
PB (KSI)
PM+PB PM+PB/3 PM VOT T+WOT (KSI)
REMOTE WOT (REMOTE)
(WOT) 0.225 0.772 4.676 1.402 13.599 6.078 6.092 s
PRIMARY STRESSES:
- 4.676 PM+PB
- 6.078 MINIMI'M REQUIRED WELD OVERIAY THICKNESS = 0.225 INCH MINIMUM REQUIRED WELD OVERLAY WIDTH 2.3 INCH
=
{
- m + m ++ *mm+ u w + m
- w + + + m m+ + + + + + + + + + + + m + + + + + + + + ++ + + + + n i
4
k 1
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i 0.135** Min Overlay Thickness j
/ Excluding First Layer i
1.5** Min 2.75" Min i
i 7.2 7
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I 2.6"! Min l
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'sk LD 4,e' First Layer of Overlay
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PIPE l
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Notes:
A.
1.6" min. width required for structural reinforcement; minimum overlay thickness is required for this section.
fl. Minimum overlay thickness is optional outside the minimum width:
however, a flat surface for UT inspection 'is required.
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FIGURE 2 OYSTER CREEK CORE SPRAY SYSTEM PIPE TO Ei, BOW WELD, NZ-3-4 3 l
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. _. _.. - ~. - _ _ _ _ _.. _ _ _. _. _ _. _ _ _ _ _ _. _. _ _
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Table 2 Overley Cesign Analysis PLANT ID:
OYSTER CREEK WELD ID NZ-3-43 PIPE THICKNESS =
0.53 INCH PIPE DIAMETER
=
8.63 INCH PRIKARY STRESSES:
5.09 KSI PRESSURE
=
DEAD WElGHT MEMBRANE =
0.00 KSI 1.06 KSI DEAD WEIGHT BENDING
=
0.00 KSI SEISMIC MEMBRANE
=
=
0.31 KSI SEISMIC BENDING SM WELD MATERIAL
= 16.95 KSI SM PIPE KATERIAL
= 16.95 KSI e
e T
PB (KSI)
PM+PB PM+PB/3 pg WOT T+WOT (KSI)
REMOTE WOT (REMOTE)
(WOT) 4 e
0.135 0.797 4.180 1.072 12.083 5.252 5.421 PRIKARY STRESSES:
= 4.180 PMtPB
= 5.252 MINIKUM REQUIRED WELD OVERLAY THICKNESS = 0.135 INCH
=
1.5 INCH MINIMUM REQUIRED WELD OVERLAY WIDTH 4
e 4.********44**************************************************
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i 0.175" Min Overlay Thickness
/ Excluding First Layer s
i 2.S** him l
g,3.. gg,
m 4
7
[ '[
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First Layer of Overla,
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j PIPE N
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l Notes: JL 1.7** anin. width required for structural reinforce 2nent; 2ninimum overlay thickness is hquired for this section.
I B.
Minimum overlay thickness is optional outside the minimutn width; however, a flat surface for UT inspection is required.
FIGURE 3 OYSTER CREEK CORE SPRAY SYSTEM PIPE TO REDUCER WELD - NZ-3-44 i
e 1able 3 Overlay Design Analysis PLANT IDI OYSTER CREEK e
WELD ID NZ-3-44 PIPE THICKNESS =
0.53 INCH PIPE DIAMETER 8.63 INCH
=
PRIMARY STRESSES:
PRESSURE 5.09 KSI
=
DEAD WEIGHT MEMBRANE =
0.00 KSI DEAD WEIGHT BENDING
=
3.13 KSI SEISMIC MEMBRANE 0.00 KSI
=
SE1SMIC BENDING
=
= 16.95 KSI SM PIPE MATERIAL
= 16.9S KSI T
PS (KSI)
PM+PB PM+PB/3 pg WOT T+WOT (KSI)
REMOTE WOT (REMOTE)
(WOT) 0.175 0.752 3.978 2.813 16.765 6.791 6.915 PRIMARY STRESSES:
= 3.978 PM+PB
= 6.791 MINIMUM REQUIRED WELD OVERLAY THICKNESS = 0.17$ INCH 1.5 INCH MINIMUM REQUIRED WELD OVERLAY WIDTH
=
- e*******************************************************************
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0.20" Min Overlay Thickness I
/ Excluding First. Layer 2.5" Min l
p f., g;,
m m
t 17
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Fhst Layer of Overla WELD 4
'7, PIPE REDUCER v
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I Notes:
A.
3.7". min. width required for structural reinforcement; minimum overlay thickr>ess is reeguired.for this section.
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B. 'Minirnum overlay thickness is optional outside the Ininimum width;
- however, a flat surface for UT inspection is-required.
e, 3
FIGURE
- OYSTER CREEK CORE SPRt,Y SYSTEM PIPE TO REDUCER WELD, NZ-3-95
_. _ _..- ~ _
Table 4 Overlay Design Analysis
.....................ee......e..................................e....
PLANT IDI OYSTER CREEK WELD ID NI-3-95 PIPE THICKNESS = 0.53 INCH 8.63 INCH PIPE DIAMETER
=
e PRIMARY STRESSES:
$.09 KS!
PRESSURE
=
DEAD WEIGHT MEMBRANE = 0.00 Es!
2.47 K81 DEAD WEIGHT BINDING
=
l 0.00 Ks1 e
SEISMIC MEMBRANE
=
2.S$ KSI SEISMIC BINDING
=
= 16.95 Ks!
SM PIPX MATERIAL
= 16.95 K$1 s
e s
T PS (KSI)
PM+PB PM+PB/3 pg e
WOT T+WOT (KSI)
REMOTE WOT (REMOTE)
(WCT) 0.200 0.726 3.863 3.742 19.346 7.605 7.136 a
PRIMARY STRESSES:
3.863 PM e
PM+PS
= 7.605 e
MINIMUM REQUIRED WELD OVERLAY THICKNtsS = 0.200 INCH
=
1.5 INCH MINIMUM REQUIRED WELD OVERLAY WIDTH e
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