ML13317A023
| ML13317A023 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 03/30/1992 |
| From: | Schafer D SOUTHERN CALIFORNIA EDISON CO. |
| To: | |
| Shared Package | |
| ML13309A332 | List: |
| References | |
| DC-3679-01, DC-3679-1, NUDOCS 9210090269 | |
| Download: ML13317A023 (11) | |
Text
Southern California Edison CALC NO.
ICCN NO./
C-1 PFAGE TOTAL NO. OF Company D
PRELIM. CCN NO.
1 PAGES DC-3679 11 INTERIM CALCULATION BASE CALC. REV.
UNIT CCN CONVERSION:
CALC. REV.
CHANGE NOTICE (ICCN)/
0 1
ccN NO. ccN CALCULATION CHANGE 1
NOTICE (CCN)
CALCULATION
SUBJECT:
RWST Evaluation CALCULATION CROSS-INDEX ENGINEERING SYSTEM NUMBER/PRIMARY STATION SYSTEM Q-CLASS O New/Updated Index Included DESIGNATOR CRS
/
RWS SR O Existing Index is Complete CONTROLLED PROGRAM OR PROGRAM/DATABASE NAME(S)
VERSION/RELEASE NO.(S)
DATABASE IN ACCORDANCE C ALSO, USTED BELOW WITH NES&L 41-5-1 BRIEF DESCRIPTION OF ICCN/CCN:
W PRORA DAN5-1 O PROGRAM O1 DATABASEN/
This ICCN adds a new supplement to enclose several anchor bolt connection details at the base of the Refueling Water Storage Tank.
The inside void will be filled with a sealant material to protect the steel components from corrosion.
The results of this ICCN show that the added plate is sufficient to withstand the internal pressure of the tank in the event of a tank leak.
The new plate and weld connections are also sufficient to withstand seismic and hydrodynamic forces of the enclosed void.
No. C 0428 INITIATING DOCUMENT (DCP/MMP, FCN, OTHER FCN F-873C Rev.
0
- 2. OTHER AFFECTED DOCUMENTS (CHECK AS APPLICABLE FOR CCN ONLY);
O YES O NO OTHER AFFECTED DOCUMENTS EXIST AND ARE IDENTIFIED ON ATTACHED FORM 26-503.
- 3. APPROVAL:
DISCIPLINE/ESC:
CIVI L David M. Schaferg 51363 crue ORIGINATOR (Print name/initial) PAX GS (Sg a re OTHER (Signature)
Raimund F. Osborne W 51740 r
IRE (Print name/initial) PAX ES&L DM (Signature)
Date
- 4. ASSIGNED SUPPLEMENT ALPHA DESIGNATOR:
CONVERSION TO CCN DATE 9210090269 921001 PDR ADOC PDR SCE CM-SONGS SCE 26-122-1 REV. 9/91 P
___ _SCE _ _____ ____
SUPPLEMENT A ICCN NOJ
~
CALCULATION TITLE PAGE IC:CN NA Z
PRELIM. CCN NO.
PAGE OFL ICNCONVERSION.
Calc. No.
-3(-7 DCP/MMP/FIDCN/FCN No. & Rev.
9 73 C N. CCN Subect RL-JST E V AL A T'l7J Sheet System Number / Primary Station System Designator
/ R SONGS Unit 0-Class 5-k Tech. Spec. Affecting?
NO YES, Section No.
_Equipment Tag No.
CONTROLLED PROGRAM PROGRAM /DATABASE NAME(S)
VERSION/RELEASE NO.(S)
COMPUTER O.
D B
ALSO, LISTED BELOW PROGRAM /
DATABASE DATABASE IN ACCORDANCE WITH NES&L 41.5-1 IQ /A RECORD OF ISSUES REV.
TOTAL PREPARED APPROVED DISC.
DESCRIPTION SHT.
(Print name/initial)
(Signature)
LAST SHT.
ORIG.
GS Other ORI.
GS Other IRE DM DATE ORIG.
GS Other IRE 0MDATE IRE DM DATE ORIG.
GS Other IRE OM DATE Space for RPE Stamp, Identify use of an alternate calc., and notes as applicable.
S 's L7-f
- o. C 289 This calc. was prepared for the identified DCP/MMP. DCP completion and turnover acceptance to be verified by receipt of a memorandum directing DCN Conversion.
Upon receipt, this calc. represents the as-bulit condition. Memo date by.
SCE 2&-121-1 REV. 9/91 Prired on recreed paper
CALCULATION CROSS-INDEX ICCN NON PIREUJM. CCN NO.
C-1 PAGE 3
OF 11 S
IEM NT A M****
A CN CONVERSION:
Calculation No.
DC-3679 Sheet No. A -2 CcNNO. CCN-Cic. rev.
INPUTS OUTPUTS Does the output number and uIdentify output Interface respos~bleThese Interfacing calculations and/or documents provide Input doumn crceocmutiCNreN supryiso initials to the subject a
onan a
on Results ard conclusion of the subject calculation are used In document rauire n
and date the subject calculation.
these Interfacing calculations ard/or documents, revision?
Calc/Document No.
Rv No.
Calc/Document No.
[
Rev. No.
YES / NO Rev. 0 DC-3679 0
FCN F-873C /tFro-4,T
-t)P' No 1810-AA066-DO041 0
FCN F-874C /s-&
/(
No 567781 16 SCE 26-424 REV. 9/91
NES&L DEPARTMENT ICCN NOJ CALCULATION SHEET PREUM.CCNNO.
C-1 PAGE 4 OF 11 CCN CONVERSION Project or DCP/MMP -FCN F-873C Calc No.
DC-3679 CCN NO. CCN W
Jbject RWST Evaluation SUPPLEMENT A Sheet No. 4 -3 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE
[
0 0.M. SCHAFER
, fl 12R.F. OSBORNE TABLE OF CONTENTS PAGE.
1.0 PURPOSE 4
2.0 RESULTS/CONCLUSIONS 5
3.0 ASSUMPTIONS 6
4.0 DESIGN INPUTS 7
5.0 METHODOLOGY 8
6.0 REFERENCES
9 7.0 NOMENCLATURE 9
8.0 COMPUTATIONS 10 SCE 26-426 NEW 4/90
NES&L DEPARTMENT CCN NO.1 CALCULATION SHEET PREUM. CCN NO.
C-1 PAGE 5 OF 11 CCN CONVERSION Project or DCP/MMP -FCN F-873C Calc No.
DC-3679 CCN NO. CCN ubject RWST Evaluation SUPPLEMENT A Sheet No.
REV ORIGINATOR DATE IRE DATE REI ORIGINATOR DATE IRE DATE M. SCHAFER tJ R.F. OSBORNE ANCHOR BOLT SEAL 1.0 PURPOSE This supplement provides a cover plate over anchor bolt supports.
The enclosed anchor supports will be filled with a sealant to protect the steel surfaces and stop any tank leakage at the supports. The cover plate is also analyzed to withstand the maximum hydrostatic and hydrodynamic tank pressures at the anchor bolt location.
I SCE 26-426 NEW 4/90
NES&L DEPARTMENT ICCN NOJ CALCULATION SHEET PRELIM.CCNNO.
C-1 PAGE 6 OF 11 CCN CONVERSION Project or DCP/MMP FCN F-873C Calc No.
DC-3679 ICCN NO. CCN
~SUPPLEMENT A
ubject RWST Evaluation Sheet No.k REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE 0
.M. SCHAFER M27/,z/t/7 R.F. OSBORNE I,
I 2.0 RESULTS/CONCLUSIONS The 3/8" plate is sufficent to withstand the maximum hydrostatic pressure of 16 pounds per square -inch. The welded connection and plate have sufficient margins of safety to withstand the hydrodynamic and seismic loads from the added filler material in the void.
(The enclosed void is approximately 0.1 cubic feet.)
The enclosed void around the anchor bolt will be filled with a sealant material.
The sealant will-prevent additional water leakage from the tank and protect the anchor bolts from potential corrosion from the RWST borated water.
SCE 26-426 NEW 4/90
NES&L DEPARTMENT CN NO.1 CALCULATION SHEET PRELIM.CCN NO.
C-1 PAGE 7 OF 11 CCN CONVERSION Project or DCP/MMP FCN F-873C Calc No.
DC-3679 CCN NO. CCN
.ubject RWST Evaluation SUPPLEMENT A
Sheet No.
REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE M.. SCHAFER J4 h7d/// R.F. OSBORNE
/
I 3.0 ASSUMPTIONS
- 1) The leak is presently a pinhole size leak. As such, the hydrodynamic forces from sloshing-inside the tank during a seismic event would not normally occur on the added plate.
For conservatism, the added plate will be checked for the hydrodynamic forces in the tank.
This assumption will demonstrate that if the hole propogates, the plate is also adequate to withstand the seismic hydrodynamic effects.
- 2) The added plate will not be credited with additional seismic support of the anchor assembly. The added weight of the plate and sealant (less than 10 pounds each) is much smaller than the total tank weight (57 kips) and does not appreciably affect the seismic analysis of the tank. As such, tank overturning analysis will not be re-evaluated.
There are no other assumptions made which affect the results of this supplement or the base calculation. No computer programs are used in this calculation.
SCE 26-426 NEW 4/90
NES&L DEPARTMENT CcN NOJ CALCULATION SHEET PRELIM.CCNNO.
C-1 PAGE 8 OF 11 CCN CONVERSION Project or DCP/MMP FCN F-873C Calc No.
DC-3679 CCN NO. CCN ubject RWST Evaluation SUPPLEMENT A
Sheet No.4 7 ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE IPi:.1M. SCHAFER R.F. OSBORNE
/I 4.0 DESIGN INPUTS The Refueling Water Storage Tank is a safety related tank per the Q-List and is qualified for Seismic Category A design requirements. The anchor connection details are shown on Vendor Drawing 1810-AA066-D0041. The anchor bolt.locations are shown on SCE drawing 567781.
Tank and anchor bolt dimensions are obtained from the original vendor drawings for the Refueling Water Storage Tank (Reference D).
The maximum hydrostatic pressure of 16 psi is taken from page 16 of the base calculation. The total hydrodynamic pressure of 7.0 psi (t= 0.329 in.) is obtained from page 16 of the original calculation. The horizontal hydrodynamic force in the tank wall is 1963 lb/in height per page 17 of the original calculation.
The RWST contains water that has various chemicals and radioisotopes in its consistency. The major contribution from a chemical standpoint is boron (boric acid).
Per the UFSAR, the concentration is approximately 3500-4000 ppm boron, In addition, the RWST contains low level amounts (10E-5) of radioisotopes including tritium. The RWST also contains trace amounts of lithium and various other element (chlorides, sulfates, etc.).
After consultation with the vendor and reviewing the material data sheets, it was determined that none of the chemical components mentioned above would have any substantial effect on the sealant.
E 6
SCE 26-426 NEW 4/90
NES&LDEPARTMENT CN NO.1 CALCULATION SHEET PREUM.CCN NO.
C-1 PAGE 9 OF 11 ICCN CONVERSION r roject or DCP/MMP FCN F-873C Calc No.
DC-3679 CCN NO. CCN abect RWST Evaluation SUPPLEMENT A
Sheet No. 4 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE S
D.M. SCHAFER
- m,117 O.F.
OSBORNE 5.0 METHODOLOGY The methodology used in this Supplement is the same as the base calculation. The anchor bolt cover plate is evaluated per standard formulas for plates with-allowables per the ASME Code.
No attempt is made to qualify the anchor bolt enclosure to ASME Code provisions.
The hydrodynamic stresses for the tank wall, which are obtained from the original calculation, are factored for the wall thickness of the new plate. The allowable plate stress is obtained from Reference G.
The RWST is not a pressurized tank. The original specification (BSO-433) for the Tank indicates that the tank was built to API 650 "Welded Steel Tanks for Oil Storage".
This repair is not an ASME code classified repair of the tank.
Generic Letter 90-05 is considered applicable only to ASME code piping. The Technical Quality Assurance Manual and the Inservice Inspection program have committed to maintaining the RWST tank as a ASME Code Class 2,Section XI tank. As such, NRC approval is necessary before implementation of the repair.
SCE 26-426 NEW 4/90
NES&L DEPARTMENT CN No./
CALCULATION SHEET PRELIM.CCN NO.
C1 I
PAGE 10 OF 11 CCN CONVERSION roject or DCP/MMP FCN F-873C Calc No.
DC-3679 CcN NO. CCN
.jbject RWST Evaluation SUPPLEMENT A
Sheet
_o _9 ORIGINATOR D
IRE DATE REY ORIGINATOR DATE IRE DATE 0
D.M. SCHAFER
'Z7/f 21 R.F. OSBORNE
6.0 REFERENCES
A) "Formulas for Stress and Strain", Roark & Young, 5th Edition B) "Steel Construction Manual", American Institute for Steel Construction, 8th Edition C) "Structural Welding Code" AWS D1.1-82, American Welding Society
- 0) Vendor Drawing 1810-AA066-D0041, Rev.0; "Pittsburg Des Moines RWST Tank Anchor Connection Details" E) Vendor Drawing 1810-AA066-DO042, Rev.0; "Pittsburg Des Moines RWST Tank Outline Configuration" F) Drawing 567781, Rev. 16; "Foundation Plan and Details Area 14" G) ASME, Boiler & Pressure Vessel Code,Section III, Appendix I 7.0 NOMENCLATURE Standard nomenclature is per the American Institute of Steel Construction, 8th Edition.
SCE 26-426 NEW 4/90
NES&L DEPARTMENT iCCN NO./
CALCULATION SHEET PREUM.CCNNO.
C-1 PAGE 11 OF 11 CCN CONVERSION Project or DCP/MMP FCN F-873C Calc No.
DC-3679 CCN NO. CCN
.bject RWST Evaluation SUPPLEMENT A Sheet No.A/i0 REV ORIGINATOR DATE IRE DATE REV ORIGINATOR DATE IRE DATE S
SCHAFER I
R.F. OSBORNE 31I 8.0 COMPUTATIONS ANCHOR BOLT SEAL The bolt support will be covered with a 3/8" A36 steel plate.
The void around the anchor bolt will be filled with a sealant.
The A-36 steel cover plate thickness (0.375 in.) is greater than the A-283C steel tank shell (0.329 in.).
The allowable stresses, per Reference G, are also similar [12.6 ksi (A-36) vs. 12.7 ksi (A-283C)].
Therefore, the plate size is adequate for the hydrostatic and hydrodynamic forces in the tank based on the greater plate thickness and similar allowable stresses.
Check Weld Size (3/16" seal weld three sides)
Credit is taken for just the vertical seam (fillet) welds only.
These welds are loaded in shear. Minimum weld size per AWS for 3/8 inch plate is 3/16 inch fillet weld. Allowable shear stress = 2.39 kips per linear inch per AWS Stress Allowables for E60XX weld material.
Shear Stress, fw; (Kips/in)
Hydrostatic Pressure, P, = 16.0 psi Hydrodynamic Pressure, P2 = 7.0 psi Horizontal Stress, F, = 1.96 K/in (P
7-= 1.96 Therefore, 3/8 in. plate and 3/16".fillet welds are acceptable.
SCE 26-426 NEW 4/90