ML20053B139
| ML20053B139 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 05/26/1982 |
| From: | Schroeder C COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8205280105 | |
| Download: ML20053B139 (12) | |
Text
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/
Commonwealth Edison i
t
. one First National Plaza. Chicago. Illinois 7 Address Reply to: Post Office Box 767
'q
/ Chicago, Illinois 60690 May 26, 1982 Mr. Harold R.
Denton, Director Of fice of Nuclear Reactor Regulation U.S.
Nuclear Regulatory Commission Washington, DC 20555
Subject:
LaSalle County Station Units 1 and 2 Teledyne Open Item and Error / Deviation Reports for the LaSalle Independent Design Review, Supplemental Responses NRC Docket Nos. 50-373 and 50-374 Reference (a):
C.
W. Schroeder letter to H. R. Denton dated March 16, 1982, " Independen t Design Review Initial Status Report for the Period o f February 11 through March 12, 1982."
(b):
C.
W.
Schroeder letter to H.
R. Denton dated Ma y 7, 1982, "Teledyne Open Item and Error / Deviation Reports for the LaSalle Independen t Design Review. "
(c):
C.
W. Schroeder letter to H. R. Denton dated May 13, 1982, "Teledyne Open item and Error / Deviation Report for the LaSalle Independent Design Review -
Second Transmittal."
(d):
C.
W.
Schroeder letter to H.
R. Denton dated May 14, 1982, " Teledyne Open Item and Error / Deviation Reports for the LaSalle Independent D9< ign Review -
l Final Transmittal; and 1st Transmittal
~
o f Responses."
(e):
C.
W. Schroeder letter to d. R. Denton dated May 20, 1982, "Teledyne Open Item and Error / Deviation Reports for the LaSalle Independent Design Review, Responses to Remaining Items."
Dear Mr. Denton:
Re ference (a) provided you with an initial status report o f the Independent Design Review being conducted at LaSalle County Station.
Re ferences (b), (c), and (d) provided you with three sets of Teledyne Open Item and Error / Deviation Reports.
References (d) 8205280toS 80[
4
i H. R. Denton May 26, 1982 and (e) also transmitted our responses to the Open Item and Error /
Deviation Reports.
The purpose of this letter is to transmit to you a supplemental response to error / deviation No. 7 which provides additional information.
Also enclosed are tables which were inadvertantly omitted from the response to error / deviation No.12 which was transmitted to you in Reference (e).
Under separate cover, this material is being provided to Mr. James G. Keppler.
If there are any questions regarding this matter, please contact this office.
Ve ry truly yours, C))YA<A~- slu. lev C. W. Schroeder Nuclear Licensing Administrator 1m Attachment cc:
NRC Resident Inspector - LSCS - 1/0 4216N
__ j
f s>$st,
"May 25, 1982 Mr. L.0. DelGeorge:
Subject:
Supplemental Responses for the LaSalle Independent Design Review Enclosed are two supplemental responses to items identified by Teledyne.
The supplemental response to error / deviation No. 7 provides additional information.
The remaining pages are tables which were inadvertently omitted from the response to error / deviation No. 12 which I transmitted to you on May 19th.
You should transmit this information to Mr. Denton and Mr. Keppler.
[I Yz g-B.R. Shelton BRS/bmb/1574L cc:
J.
claherty (Teledyne)
R.H. Holyoak T.E. Watts C. Reed J.J. Maley B.B. Stephenson
I
~
SARGENT a LUNDY ENGINEERS S S E A ST MON RO E STREET CHIC AGO. ILLINOts 60603 TELEPHONE 312 269 2000 May 24, 1982 Project No. 4266-24 Commonwealth Edison Company LaSalle County Station - Units 1 & 2 Third Party Independent Review Mr.
B. R. Shelton Project Engineering Manager Commonwealth Edison Company P. O. Box 767 Chicago, Illinois 60690
Dear Mr. Shelton:
Enclosed are 12 copies of Sargent & Lundy's supplemental response to Toledynes Error / Deviation Report 7.
Also enclosed are pages E/D 12-4, 5,
6, 7, 8 and 9 which were inadvertantly left out from my letter to you of May 18, 1982.
It is our understanding that Commonwealth Edison Company will distribute these simultaneously to Teledyne, the NRC and internally.
If you have any questions, please do not hesitate to call me.
Yours very truly, f% H. FW tW R. H. Pollock RHP: Jam Mechanical Project Engineer Enclosures Copies:
W.
A. Chittenden (1/l)
E. V. Abraham (1/1)
G. C. Kuhlman (1/1) i R. J. Mazza (1/l)
E. B. Branch (1/l)
D. C. Haan (1/1)
W. G. Schwartz (1/0)
E.
R. Weaver (1/0)
- 5. D. Killian (1/1) j File 85
@o'FY i
SARGENT & LUNDY ENGINEERS CHICAGO SUPPLEMENTAL RESPONSE FOR ERROR REPORT 7 The question of incorporating code revisions in PIPSYS on projects subject to earlier code editions has been raised before and Sargent &
Lundy has undertaken review of these changes in the past.
In the majority of cases, the Code revisions and associated PIPSYS modifications made since 1974 represent an analytical approach which more accurately reflects the physical characteristics of the piping components involved.
In our view, this leads to a more reliable All of the code revisions issued since 1974 represent a design.
significant effort on the part of the ASME through research and review, to accomplish that same goal.
In the same spirit, it is our policy with the PIPSYS Program to apply to be Code paragraph NA-ll40 that allows Code addenda and editions, used that are published after the piping fabrication contract date.
As Code analysis revisions,are published, Sargent & Lundy reviews A revision them for positive or negative impact on current designs.
is considered to have positive impact if it will not cause design changes and if it provides better methods or tools for analysis.
A revision is considered to have negative impact if it has potential to cause design changes.
Revisions that have positive impact are Those that have a immediately incorporated into the PIPSYS Program.
negative impact are not incorporated unless a definite safety concern is generated by not doing so.
Any revision causing a negative impact is reviewed with the Project team prior to implementation.
Current design documents specify piping design based on the 1974 is important to note that nearly all Code piping analysis Code.
It revisions published since the 1974 Code was issued have been in the direction of either reducing unnecessary conservatism or providing j
,i better analytical techniques.
On balance, the industry has benefited greatly from these changes.
The following discussion details the specific modifications to the PIPSYS stress analysis that have been incorporated since the 1974 These items are the sum total of the dif ferences between the i
Code.
i PIPSYS analysis and the 1974 Code.
1.
Class 1 Stress Analvsis The PIPSYS Class 1 stress analysis is based on the 1977 Code, The differences up to and including the Summer of 1979 addenda.
from the 1974 Code are minor and, with the exception of Item C in the following list, the overall effect of all revisions was to reduce conservatism.
This means that any reanalysis based on the later requirements will not generate system design changes.
The specific revisions are as follows.
k index B was reduced from 1.0 a)
For branch connecticns, stress to 0.5, index C was reduced from 2.0 to 1.5, and index K was y
3 increased from I.7 to 2.2.
p I
k E/D 7-1 1
- ~ '
SARGENT & LUNDY ENGINEER 9 CHICASO e
b)
For curved pipe or butt weld elbows, stress index B1 was reduced from 1.0 to 0.5.
c)
For butt weld reducers, stress indices C1 = 1.5, K1 = 2.0, C2 = 1.3, and K2 = 1.0 were replaced by index equations based on reducer geometry.
d)
For butt weld tees (B16.9), index B1 was reduced from 1.0 to 0.5.
Indices B2b and B r were revised as follows:
2 e)
The allowable stress for Service Level B (Upset Condition) for equation (9) was increased from 1.5 Sm to 1.8 Sm.
f)
ThehTi stress term was eliminated from equation (10) and a thermal stress ratchet check was added in NB-3653.7.
2.
Class 2 and 3 Stress Analysis The PIPSYS Class 2 and 3 stress analysis is based on the 1977 Code, up to and including the Winter 1978 addenda.
The latter analysis is essentially the same as that required in the 1974 Code except as follows:
a)
A stress intensification factor (i) was added for brazed
- joints, b)
Equation (10a) was added to provide a criteria for single non-repeated anchor motions such as building settlements.
c)
A Service Level D stress limit (Faulted Condition) was added where no criteria was previously given.
The limit is 2.4 Sh.
None of these code changes were made as a result of changes in other sections of the Code (e.g. NB-4000) nor did they require that other sections be changed.
Therefore, we believe the use of the 1977 Code with addenda identified as above is appropriate for the analysis of i
Class 1, 2 or 3 piping otherwise designed, fabricated and installed to the 1974 Code.
k i
i t
f 5
E/D 7-2 i
SARGCNT & LUNDY EN GINE ERS CHICAG) o l
TABLE 1 t
RHR PUMPS Class 2 Calculations Cla ' 1 Calculations Calculated Allowable Calculated Allowable PSI PSI PSI PSI Discharge Column 21989 26250 21989 30000 1
Pump Casing 5878 8250 5878 26250 Suction Column a
5368 16550 5368 32550 Discharge Head a=12623 c=37500 13124 61000 Hold-Down Bolt T=
2565 T=15500 Motor Hold-Down au22981
- c=37500 23659 61000 Bolts T=
4005 T=15550 Foundation Bolts c=24329' a=29000 25897 35000 T=
6373 T=11950 Shaft Stresses
),
8314 15000 6149 17500 Junction Between Stuffing Box and Discharae Elbows 25763 28875 43600 45000 4
l t
I E/D 12-4 i
l I
L_
SARGENT & LUNDY cHoentcao 4
CHICteGO TABLE 2 6
Class 2 Calculations, Class 1 Calculations HPCS Pump Calculated Allowaole' Calculated Allowable PSI PSI PSI PSI Description Stresses on Shaft 7095 17500 9780
- 17500, at minimum sections Discharge Head Bolting 12912 55000 13333 60000 4159 25000 49/4 Juuuo Thread Engagement Stuffing Box-Discharge 10202 27390 44J43 bJ900 Elbow Interface Foundation LQad on 21829
("I 29000 4J /4J Jouuu 6701 (ri 11950 Bolts Motor Stand 1244 27390 lu44 JUUUU Suction Barrel /Shell 28300 28875 Interface Motor Mounting Bolting 1877 55000 ld's 60000 Minimum Thickness required supplied requirec supplied
.242 in.
75 in.
.197 in.
.75 in.
Pump Shell Discharge Nozzle
.81 in.
L.312 in.
.604 in.
1.312 in.
688 in.
.13 2 in.
.688 in.
Suction Nozzle
.152 in.
Torispherical Head
.159 in, 75 in.
.13 7 in.
75 in.
of Shell O
e m
e e
e E/D 12-5 9
0
SARGENT & LtJNDY EN GIN E E RO f
C HIC ACO EVALUATION AT CRITICAL LOCATIONS i
LPCS Pump TABLE 3 Location Evaluated an Class 2 Evaluated as Class 1 Calculated Allowable CalculatedAllowable Motor Stand 5221 psi 19250 psi 5211 psi 30000 psi
'4otor Bolting 5587 psi (2) 37500 psi 74 4 9 p.;i 60000 psi 2281 psi (2) 15500 psi suction Barrel 3180 psi 37800 psi Shell Suction Barrel 8195 psi 16500 psi Shell at Inlet Nozzle.
Suction Barrel 5024 psi 16500 psi 5024 psi 21000 psi Head / Pin Interface Pump First Stage 2446 psi 8250 psi 2446 psi 15000 psi Casing Minimum Section Pump Series Casing 3000 psi 8250 psi 3000 psi 15000 psi Minimum Section Pump Series Am= 7.73 in" Ab=ll.02 in" 5617 psi 30000 psi Casing Bolts (Required)
(Available)
Pump Top Casing Am= 7.65 in Ab=11.02 in p592 psi 30000 psi Bolts (Required)
(Available) t Stuffing Box /
24170 psi 31500 psi 52900 psi 63900 psi Discharge Elbow Interface Discharge Head Am= 19.60 in' Ab=19.84 in" 21676 psi 60000 psi Bolts (Required)
(Available)
Foundation 12730 psi (2) 29000 psi 12730 psi 35000 psi Bolts 4129 psi (2) 11950 psi Discharge Column 6101 psi 16500 psi
'5101 psi 30000 psi Discharge Column Am= 8.73 in Ab=ll.02 in L1112 psi 60000 psi Bolts (Required)
(Available)
Pump Shaf t at 5838 psi 15000 psi 5838 psi 17500 psi Minimum Section e
E/D 12-6
RilR Pump _,
Analysis of Discharce Elbows at Stuffina Box Junction The junction between the discharge cibow and the stuffing box is not a cylindrical nozzle but an intersection with a
i two radii of curvature.
The radius of curvaturesis in the transverse plane.
the local-stresses'at.this junction
.To accurately compute under imposed piping loads, a detailed analysis using Bijlaard's stress tables was complpted.
(See attached sheets)
From these calculations,the worst combined i
stresses for the emergency loads are found to be 25763 psi at points A,B, and 19926 psi a (points C,D.
' These 4
stresses are well below the allowable value of 1.8S =
1.8 x]7,5000 = 31500 psi for emergency and 1,65S = 1.65
~
X 17500 - 28875 psi for up, set condition..
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