ML19210B628
| ML19210B628 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/03/1970 |
| From: | Metropolitan Edison Co |
| To: | |
| Shared Package | |
| ML19210B627 | List: |
| References | |
| NUDOCS 7911110103 | |
| Download: ML19210B628 (14) | |
Text
.
hiq'l_
l, nanind w.ur w a i,
,y -
FURNACE SENSITIZED STAINLESS STEEL
.s IN PRESSURE RETAINING AND STRUCTURAL PORTIONS
.8/
TMI Nos. 1 and 2 c '< l '
R PRIMAR Y SYSTEM As a result of problems at other nuclear stations, Met-Ed took action in the early phases of the TMI Nos. I and 2 Projects to eliminate the use of all furnace sensitized stainless steel from the pressure retaining structural portions of the primary coolant systems. As a result, furnace sensitized stainless steel was elimira ted from the pressure retaining struc-tural portions of the reactor vessel, pressurizer, steam generator, reactor coolant piping, and core flooding tanks. The only furnace sensitized stain-less steel used in these components is in the cladding which is not a pressure retaining structural part.
The specific material and fabrication sequences being used on the Three Mile Island Units Nos. 1 and 2 to eliminate furnace sensitized stainless steel can be summarized as follows:
1.
Reactor Vessel (See Figures 1, l A, and IB) a.
The in-core instrument penetrations in the lower head are Inconel.
b.
The closure head control rod drive penetrations are partially Inconel and partially stainless steel, but are installed after final stress re-lief of the head.
c.
The primary coolant nozzles do not require stainless steel or Inconel safe-ends since the piping is low alloy carbon steel.
d.
The welds for penetrations of the core flooding nozzles are buttered with Inconel. The stainless steel safe-ends and thermal sleeves are installed after final stress relief of the vessel.
\\bSS DA M"
7911110/0 3
e.
The core stop lugs are Inconel.
f.
The flow vanes are stainless steel and are installed after final stress relief of the vessel.
2.
Steam Generators (See Figure 2)
The primary coolant nozzles do not require stainless steel or Inconel a.
safe-ends since the piping is low alloy carbon steel.
b.
The tubing is Inconel c.
The drain nozzle is Inconel 3.
Pr e s su riz e r (See Figure 3 )
Of the eight nozzles less than four inches in diameter, seven will a.
have Inconel safe-ends and the vent nozzle will be entirely Inconel.
b.
The four inch diameter spray and ten inch diameter surge nozzles will be buttered with Inconel. The stainless steel safe-ends and ther thermal sleeves will be ins talled after final stress relief.
The stainless steel internals (surge deflection device and pressurizer c.
heaters) will be installed after final stress relief.
4.
Primary Coolant Pining (See Figures 4A, 4B, and 4C) a.
Nozzles less than four inches in diameter will be Inconel or have Inconel safe-ends except that the weld preparation of the high pres-sure injection nozzles will be buttered with Inconel and the stainless steel safe-ends and thermal sleeves will be installed after final stress r eli ef.
b.
The 12 inch decay heat and 10 inch surge nozzles will be buttered with Inconel. The attached stainless steel piping will be welded directly to the Inconel butter layer in the field.
The reactor coolant pump inlet and discharge safe-ends will be stain-c.
less steel which will be welded to an Inconel butter layer after final stress relief.
5.
Core Flooding Tanks (Figures 5A and 5B) a.
On TMI No.1 nozzles less than four inches in diameter will be carbon steel with weld deposited stainless steel cladding and with an Inconel safe-end. On TMI No. 2 such nozzles will be entirely Inconel.
1 E C 8 0 t: 5 isa
b.
The 14-inch core flooding nozzles will be buttered with Inconel.
A stainless steel safe-end will be attached to the Inconel butter layer after final stress relief.
1508 006 NOTE: NOT TO SCALE
-CatlTROL ROD OR!VE pet 1ETR A Tl 0N NUMBER -69 TYPE 308 SS WELD SIZE
- 2.765"l0
%=
DEPOSIT CLADDING (SEE FIGURE IB)
M 4
I'.'
l!I l \\
lll
!!a_
a0 Y
-lNCONEL WELD e
DEPOSIT BUTTERING FOR ATTACHING q SAFE-END AFTER N
STRESS RELIEF g
9 PRIMARY COOLANT N0ZZLE -
2 OUTLETS - 36" 10
-CORE FLOOD N0ZZLES 4 INLETS
- 28" 10 NUMBER 2
(NOTE: SAFE-ENO NOT SIZE 11.50"10 REQUIRED SINCE P:PltlG IS CARBON STEEL CLAD
~ BASE NATERIAL-p WITH STAltiLESS STEEL)
FORGINGS:
T A-508-64 FLOW VANES
/
CLASS 2 304 STAINLESS STEEL
\\
CC-1322
\\
/
f INSTALLED AFTER
/
PLATE:
STRESS RELIEF SA-302
/
GR. B l
CC-1339 CORE STOP LUGS (INCONEL)
SHOWN OUT OF POSITION FOR CLARITY IN-CORE INSTRUMENT PENETRATIONS NUMBER 52 SIZE 3/4" SCH.160 INCONEL (SEE FIGURE lA)
~
NETROPOLITAN EDISON REACTOR VESSELS TNI IZ2 FIGURE I
}
. NOTE: THESE ARE5
.it1ATIC WELO JOINTS TO SH0'i
,ASIC PRINCIPLES USED TO PREVENT SENSITIZATION OF STRUCTURAL WELOS.THESE ARE NOT EXACT WELD JOINT CONFIGURATIONS.
\\
WELO DEPOSIT -
INCONEL CLA00E0 i
CORE STOP LUGS (INCONEL)
(THE LUGS ARE AT THE SAME ELEVATION AS THE FLOW VANES, l
BUT ARE SHOWN OUT OF PLANE FOR CLARITY.
WELO DEPOSIT I
STAINLESS STEEL CLAD
~ STAINLESS STEEL FLOW VANES I
WELDE0,AFTER STRESS RELIEVING, TO THE WELO DEPOSIT CLADDING lNCONEL llELD BETHEEN BASE NETALS AND INSTRUMENT HOUSING PENETRATION BEFORE STRESS RELIEVING.
/
INCONEL i
b=
3
' f_ /Y DETAILS OF REACTOR VESSEL jrog n g8 FIGURE lA gg
INCONEL BUTTERING STAINLESS STEEL (NOT SENSITIZED)
I u
a INCONEL WELO DEPOSIT 3
STAINLESS STEEL CLAD I/I 1
INCONEL WELO (HEAD TO PENETRATION WELO)
THIS WELD IS MADE AFTER STRESS RELIEF.
+
NOTE: THESE ARE SCHEMATIC WELO JOINTS TO SHOW BASIC PRINCIPLES USED TO PREVENT SENSITIZATION OF STRUCTURAL WELOS.THESE ARE NOT EXACT WELD JOINT CONFIGURATIONS.
1533 009 REACTOR YESSEL HEAD CONTROL R00 ORIVE PENETRATION FIGURE IB
36" 1.0. Pal!1ARY ltiLET N0ZZLE (1)
IS CAR 00tl STEEL WITH WELO DEPOSITED STAINLESS STEEL CLA00ltlG G
16" t1AtlWAYS (2) ARE LOW ALLOY-5" HAN0 HOLES (2) ARE LOW ALLOY-CAR 00ft STEEL WELO BUILD-UP CARB0t1 STEEL WELD BulLO-UP W!TH W'lTH WELO DEPOSITED STAINLESS WELD DEPOSITED STAINLESS STEEL CLA00 LNG STEEL CLADDING I
4 3_ _r g
wv-138" 1.0.
-v
/
s TUBE SHEETS (2) ARE LOW f
A,/
ALLOY-CARBON STEEL WITH
"/
WELO DEPOSITED INCONEL CLADDING HEADS (2) ARE LOW ALLOY CAR 80tl STEEL WITH WELD OEPOSITED STAINLESS STEEL j
[,
CLA00lNC s
d
}\\
28" 1.0. PRit1ARY OUTLET N0ZZLES (2)
I I" ORAIN LINE IS INCONEL ARE CARB0t1 STEEL WITH WELO DEPOSITED STAINLESS STEEL CLADDING nc3 070 FIGURE 2 SCHEMATIC 0F MER0POLITAN-EDISON'S TMi#1 & THI#2 STEAM GENERATOR
4" SCHEDULE 120 SPRAY Lit 4E t:0ZZLE (1)
I" SCHEDULE 160 VENT N0ZZLE (1)
IS CARBON STEEL WITH WELO DEPOSITED IS INC0!4EL WITH AN lt:C014EL SAFE-ENO STAINLESS STEEL CLADDING Ati0 AN 2.5" RELIEF VALVE N0ZZLES (31-CARB01:
' [ STEEL ItiC0t1EL SAFE-Ei40 WITH UELO DEPOSITED STAINLESS T?
STEEL CLADDING AND INCONEL BUTTERING.
i THE STAINLESS STEEL FLANGES Alli
\\',
4 A WELDEO Ott AFTER VESSEL STRESS REllEF.
x.
16" mat;WAY (1) IS CAR 30N STEEL UlTH WELO DEPOSITED
_g__
STAINLESS STEEL CLA00lt,G
/~~
4 84"
=
l.0.
1" SCHEDULE 160 LEVEL (6)
AND SAMPLE (I) N0ZZLES ARE WELO DEPOSITED STAINLESS STEEL CLA0 CARBON STEEL WITH INCONEL SAFE-ENDS.
e THERH0WELL (1) IS INCONEL g
_ _4 I
SHELL AND HEADS ARE CARBON STEEL WITH UELO DEPOSITED STAINLESS STEEL CLADDING m
10" SCHEDULE I40 SURGE LINE N0ZZLE (l) 15 CARBON STEEL WITH WELO DEPOSITED STAINLESS STEEL CL A00 LNG AND lt:CONEl BUTTERING. A STAINLESS STEEL SAFE-END IS WELDED ON AFTER VESSEL STRESS RELIEF.
FIGURE 3 SCHENATIC 0F h1ETROPOLITAN-EDIS0N'S THI#1 Z Thl#2 PRESSURIZER 1588 071
3G" 1.0. At:0 20" l.D.
R OR COOLANT PIPlNG iS C/.l:30N STEEL or, CLASS C)
/ / / / / / / ////
,//////
\\
'N
\\_
UELO DEPOSITED
/
STAINLESS STEEL CLADDING f
/ / - //
/ / / /
P/ /
/ ////
/
(A-371 ER,309 L)
A. STRAIGHT SECT!CN (int i 1 2)
STAltiLESS STEEL SAFE-END ATTACHED CARBON STEEL AFTER VESSEL STRESS RELIEF (51-376 TYPE 3f61 s
M \\\\\\M&@ /////// // /// // N \\
bWELODEPUSITE0 INC01;EL
/ STAINLESS STEEL BUTTERit;G
/
CLA0 Cit 4G j
' TNT h:a / / / ///////////
2f~SCHEOULE160STAlt:LESS STEEL SPRAY LINE K0ZZLE CONT:ECTED TO 36" 1.0. PunP OUTLET PIPING SAFE-END B. PIPE CONNECTION TO REACTOR COOLANT P'J"P IHLET AND OUTLET (ini I : 2) 35* 1.0. At:0 29" 1.0. RE ACTOR COOLANT ELBOWS ARE CARSON STEEL (A-516 GRADE 70)
HIGH ENERGY ~101:0E0 STAlt;LESS STEEL CL A00l t;G (SA-240, TYPE 304) s
/
I
/ / ///
/
/ / ///
l[suo {f C. ELBOW (Tni I L 21 FQ SCHEMATIC 0F MET-ED'S TNI I E 2 REACTOR COOLANT SYSTEN PIPING FIGL'RE 4A
T111-2 TMl-l CARR0N STEEL
///// // // /
/ / / // / ///w(
7 i
h WELD DEPOSITED
/ STAINLESS STEEL
- CLADDit:G r
/
/
~
/
/ / //
1 // / /
) - ///
///
['
NINCONEL SAFE-END INCONEL N02ZLES CAR 00tt STEEL (EXCEPT ONE DRAlti N0ZZLE IS OF THE CARBON STELL / lNCONEL SAFE-END TYPE AS USED ON TMl-1)
D. INSTRUMENT SAMPLE VENT AND DRAIN PENETRATIONS CONNECTION TO THE REACTOR COOLANT PIPING THAT ARE LESS THAN 4't.0.
CARBON STEEL
/ / / / / / / / / / / /
/ / /
N WELD DEPOSITED STAINLESS STEEL c
_ CLA00lt;G
,1 r/ /
/ / / / / /
/ / / /1 CARCON STEEL 7-STAINLESS STEEL SAFE-END ATTACHED m
INC0HEL BUTTERING AFTER VESSEL STRESS RELIEF E.2h"CONNECTIONTOTHEREACTCRCOOLANTPIPING(TMI SCHEDULE 160 HlCH PRESSURE INJECTION N0ZZLES (4) i 1 2)
CAR 20tl STEEL
/ / / / / / / / / / / / / / /
/
N WELD DEPOSITED STAINLESS STEEL f__
CLADDING
/
,'+
/ / / / / / / / / /i V r/ /
CARBON STEEL k
e-INCONEL BUTTERING F.12" SCHEDULE 140 DECAY HEAT AND 10" SCHEDULE 140 SURGE LINE CONtlECT10n 10 THE REACTO:t COOLANT PIPING (Till I 2)
JQU SCHEMATIC 0F (1ET-ED'S TMI I E 2 REACTOR COOLANT SYSTEr1 PIPING FIEURE 4B
y - CARBON STEEL
//
>) ',
i 3
&?
INCONEL s
WELD DEPOSITEL STAINLESS STEEL CLA0 DING G. RESISTANT THERH0 HETER PENETRATION IN REACTOR COOLANT PIPING (TYPICAL) (TMI I & 2)
)5[o 0
4 SCHEMATIC 0F HET-ED'S THI I & 2 REACTOR C00LAtlT SYSTEM pipit!G FIGURE 4C
~
- 2 li'CH RELIEF tt0ZZLE sWELG
$ POSITED STAlt!LESS STEEL CLAD CARB0tl STEEL WITH lt!C0t EL SAFE-Et:0 N8 h 16 11:CH I.0.t1AfluAYaWELD DEPOSITEO
-V STAlt!LESS STEEL CLAD CAR 80t! STEEL Kr
,\\
/'
WELO DEPOSIT CLAD OVER SEAM J0lHTS 4
e PLATE At:0 HEAD MATERI AL IS V
SA-SIS GR70 CARB0tl STEEL 11 2 ed
-WITH SA-240 TYPE 304 3
ROLL-BONDED STAltiLESS STEEL CL A001l'G N3 22'-5" L,_ m w
N4 3
d fl0TE:1NSTRLitENTAT10t; Z SAMPLit.G N0ZZLES a
g l INCH I0ZZLES N2st43sN4st:5, N6 AND N7 ARE WELO DEPOSITED 9 '-3 " l. 0.--+'
STAINLESS STEEL CLAD CARBON STEEL WITH lt:CONEL SAFE-ENDS EXAMPLE:
N7 Ql tlELD DEPOSITED STAINLESS STEEL CLAD CARBON STEEL 7lNCONEL N5 27
/
m N6
- n i
U
/
I[
INCUNELWELDDEPOSIT p
14 INCH 1.0. OUTLET N0ZZLEJ WELO DEPOSITED stall!LESS STEEL CLA0 CARBON STEEL BUTTERING FOR WELDII:G N A E-END p
j 316 STAltiLESS STEEL SAFE-EN0(WELDED Ott AFTER STRESS RELIEF 0F VESSEL)
FIGURE 5A 1550 0,-3 5CHEMATIC 0F MET-ED'S THl#1 CORE FLOODING' TANKS
2 It!CH RELIEF i:0ZZLEs SOLIO I!!C01:EL
~
N8 16 It!CH 1.0. [1AN11AYsWELD DEPOSITED STAii:LESS STEEL CLAD CARB0l! STEEL WELO DEPOSIT CLAD OVER SEAli JOINTS 1
7
/ e PLATE Ali0 HEAD t1ATERIAL is SA-5 IS GR 70 CARBON STEEL 11lTH SA-240 TYPE 304 i
N2 ROLL-BONDED STA Ii:LESS 7
STEEL CLA00lt:G 22'-S" N3 N4 l
n 0
Il0TE:lllSTRUl1ENTAT10tl & sal 1PLil:G t:0ZZLES I II4CH (10ZZLES N2,N3s!!4sNSs
- 9'-3" 1.0.
N6 Af;0 N7 ARE SOLIO INC0t:EL
=
EXAt1PLE:
INCONEL N7
[ -_
i N5.
-1 N6 t
s 21 r 14 liiCH 1.0. OUTLET t!0ZZLEs WELO DEPOSITED M
- '/
stall!LESS STEEL CLAD CARBON STEEL
~
INC0t:EL t!ELO DEPOSIT j
- d BUTTERil
- G FOR WEL0lt:G 316 STAINLESS STEEL SAF'E-Et:0 (WELDED OU AFTER STRESS REllEF 0F VESSEL)
ON SAFE-Et:0 lJG3 076 FIGURE SB SCHEMATIC 0F MET-ED'S Tril#2 CCRE FLOODING TANKS
4 6
6
~
s.-.._
^Tr__
a.'
. - :-4,..
FRCat' DATE OF DOCUMENT:
DATE RL (ED NO.:
Meropoletaa Edisen Co.
6-3 70 6-11 70 Reading, Fern.
L r R.
MEuo; R E,0.T:
or E=
J.G. Miller X
TO:
O Ric,,;
cc; o g e gg, C.G. Imtg. DEL 1
)
ACTION NECE51ARY
]
CCNCURRENCE DATE ANSWERED:
NO ACTION NECES$ARY O Co== E~ T O
ev:
CLAS5sF:
PCST OFFICE P sLE CooE.
U 50-289-320 RfG. NO-DESCRsP TION: (Must Be Uncl88Sehed)
REFERRED TO DATE RECENED.v DATE Ltr trans the following, per our Long 6-12-70 request...to elimiasta the use of all W/3 cys for actior furnace eensitized stainless steel from pressure retaining structural portion
- DISTRIBITfl C21
- 'w5"a" of the coolant system..
Beg file c7 (2) g0 //gf 3, (1 cy)
AEC PDR (2) 1%rnmos sensitised staini-steel in CGC,,Re-T-W ir":
e _ 14 = =4 -2 pressure retaieing & structure Parti-TMI Noe 1-2. Primary Systems...
Morris / MMa ',,,, ' '
W
~~
6 Fifures 1 thru 5 B DeYosmg N 0 f i U i '.. --,
m e,,
REmAans.
NOTE. h Above to be filed
=a a m forssi in July 1970 1E
,-c csaa m.
u.s. ATOMC ENERGY COMMISION M All CONTROL FORM FOa= AEC sus i -ooi e
U. S. GOVERNMENT PRINTING OFFICFs 1949-3e4 894 c0
()? 7 suo