ML20009B455
| ML20009B455 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 05/23/1977 |
| From: | Pawlicki S Office of Nuclear Reactor Regulation |
| To: | Kniel K Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20009B448 | List: |
| References | |
| NUDOCS 8107160021 | |
| Download: ML20009B455 (2) | |
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MAY 231977 y/ [
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Docket Nos. 50-352/353 4
IJ0 MEMORANDUM FOR:
K. Kniel, Chief
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7 Light Water Reactors Branch No. 2
.o f-Division of Project Management
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3 FROM:
S. S. Pawlicki, Chief Nd pf77,g.
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Materials Engineering Branch
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SUBJECT:
LIMERICK GENERATING STATION UNIT NOS.1 AND 2, PIPE STORAGE PRACTICES REFERENtES:
1.
Memorandum from R. T. Carlson to K. V. Seyfrit March 31, 1977, same subject 2.
Memorandum from R. A. Birkel to C. J. Heltemes, Jr.,'
April 27, 1977, same subject 3.
Memorandum fr::m F. J. Liedebach to C. J. Heltemes, Jr.,
April 27, 1977, same subject The Materials Engineering Branch has reviewed the referenced correspondence relevant to the pipe storage practices employed at the Limerick Station project. The applicant has amended its PSAR, Appendix A, paragraph A.3.5.3 to allow the storage of carbon steel pipe without the use of end caps.
We find this practice deYiates from the requirements set forth in 10 CFR 50 Appendix B, Criterion 13, NRC Regulatory Guide 1.38 and ANSI Standard N45.2.2.
In addition, the removal of the end caps increases the likeli-hood of corrosion attack and allow-the introduction of various potentially harmful substances which may impair the integrity of the stored pipe.
In view of the aforementioned reasons the storage of carbon steel pipe without end caps is unacceptable to the Materials Engineering Branch.
t S. S. Pawlicki, Chief Materials Engineering Branch Division of Systems Safety Office of Nuclear Reactor Regulation For cc's, see i
attached sheet i
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8107160021 010708 DR ADOCK 05000
gay 231977 K. Kniel.
cc:
J. P. Knight, DSS l
D. B. Vassallo, DPM R. J. Bosnak, DSS S. S. Pawlicki, DSS
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C. J. Heltenes, DPM l.
R. A. Birkel, DPM l
H. F. Conrad, DSS U. Potapovs. DSS l
W. J. Collins, IE l
F. J. Liederback, DPM LR. T. Carlson, IE K. V. Seyfrit IE G. Georgiev, DSS e
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s Distribution Docket File Wlirn111ns M
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JUL 1 4 WII NRC PDR M. Reglon J Local PDR RABirkel LWR #2 File HConrad DBVassallo UPotapovs FJWilliams FLiederbach Docket Nos. 50-352 KKniel RTCarlson and 50-353 Jtee KSeyfrit ELD
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DTibbitts HSmith Philadelphia Electric Company JRBuchanan, NSIC ATTN: !!r. Edward G. Bauer, Jr.
T8Abernathy, TIC Vice President & General Counsel ACRS (16) 2301 Martet Stmet Philadelphia, Pennsylvania 19101 7
I Gentlemen:
SUBJECT:
PIPE STORAGE PRACTICES AT THE LIMERICK GENERATING STATION In Amendnent No.17 to the Limerick Generating Station Preliminary Safety Analysis Report (PSAR), the practice for storing carbon steel pipe
(
was modified; the modification allowed outside storage of carbon steel pipe without end caps. We have reviewed this change and have detemined that this practice is unacceptable. The bases for our conclusion are 3g given below.
b While the PSAR does not contain justification for this change, the Office of Inspection and Enforcement (IE) was informed that you based the change on a study which concluded that uncapped storage _of carbon steel pipe.
r iid foiiiid that it did not ymvi(e a basic to support this conclusion.s}
is less deleterious than capped storage./ However, IE reviewed the study
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~Furthennore, IE noted that you do not have' a' program to' perfonn post storage evaluation of pipe wall thickness.
b Since you have not demonstrated that this storage practice prevents deterioration of piping materials, the practice deviates from the requirements set forth in 10 CFR 50. Appendix B, Criterion 13; Regulatory Guide 1.30. " Quality Assurance Requirements for Packaging, Shipping, i
Receiving, Storage and Handling of Items for Water-Cooled Nuclear Power r
Plants," and ANSI Standard N45.2.2.
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We therefore require that the practice of uncapped storage of carbon steel pipe be discontinued and that you institute measures to evaluate the adequacy of the piping that was stored uncapped.
Sincerely, Original signed by, s -
K.Kniel j p
Karl Kniel, Chief g@f Light Water Reactor 1; Branch No. 2 Diyision of Project Management cc: See page 3
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DPM: LWR J2_
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Philadelhia Electric Company oca Troy B. Conner, Jr., Esq.
1747 Pennsylvania Avenue, N. W.
Washington, D. C.
20006 W. William Anderson, Esq.
Deputy Attorney General Room 512, Main Capital Building Harrisburg, Pennsylvania 17120 Frank R. Clokey, Esq.
Special Assistant Attorney General Room 218, Towne House Apartnents P. O. Box 2063 Harrisburg, Pennsylvania 17105 Honorable Iawrence Coughlin House of Representatives Congress of the United States
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Washington, D. C.
20515 Boger B. Reynolds, Jr., Esq.
324 Swede Street Norristown, Pennsylvania 19401 Willard C. Hetzel, Esq.
312 Main Street East Greenville, Pennsylvania 18041 Iowrence Sager, Esq.
Sager & Sager. Associates 45 High Street Pottstown, Pennsylvania 19464 Joseph A. Smyth Assistant County Solicitor l
County of Montgomery Courthousa Norristown, Pennsylvania 19404 Eugene J. Bradley Philadelphia Electric Cmpany Asseciate General Counsel 2301 Market Street Phila$elphia, Pennsylvania 19101 seric e >
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PHILADELPHJA ELECTRIC COMPANY
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2'JO1 MARKET STREET PrilLADELPHIA. PA.19101 12158 s41 4 500 v.s.sovER
,,u.u..u n November 1, 1977 4
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' ' ',",e Mr. Karl Kniel
,": '. ' ' /s Division of Project Management 4*
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Light Water Reacto.'s Branch No. 2 U.S. Nuclear Regulatory Commission
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' g Washington, DC 20555
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,1 h'tv RE: Limerick Generating Station, Units 1 and 2.
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Docket Nos. 50-352 and 50-353
'N **.) l' A
Dear Mr. Kniel:
This is in response to your letter dated July 14, 1977, which stated that suf ficient justification was not included in Amendment No.17 to the Limerick Generating Station Preliminary Safety Analysis Report (PSAR) to allow outside storage of carbon steel pipe without and caps.
The subject change in the Limerick storage practice for carbon steel pipe was prompted by a study which indicated that many of the pipe spools with end caps could not meet required cleanliness criteria during storage in spite of extensive storage preparation (i.e. drying out of all spools, installation of large quantities of dessicant, sealing the openings). One inspection, performed in December 1973, showed that water collected in spools and caused excessive rusting even when the ends were properly capped and sealed. Of those spools that did not pass the inspection due to unsatisfactory dessicant or standing water, only about half of the spools had unacceptable tape or end caps. It was concluded that a pressure tight closure was necessary to avoid condensation and standing water. Taping the end caps did not provide a pressure-tight seal, and no other practical method to seal the spools was available.
The reaults of the December 1973 inspection are summarized in Table 1.
The pipe spools in that lot had been in storage for only nine months. As indicated, the first snd second random samplings resulted in rejection of l
the lot for standing water and necessitated a 1007, inspection. Many of the l
pipe spools rejected for standing water were properly sealed. The water j
accumulation is attributed to changing temperatures from day to night and l
cesson to season causing the at:nosphare within the " sealed" spools to expand and contract resulting in the intake of moist air during cooling and exhausting relatively dryer air during warmer periods. 'It was concluded that l
storing the pipe spools in a canner similar to that described in ANSI N 45.2.2 for extended periods of time (in some case 2 pipe spools are in storage for nearly 5 years) was not acceptable and would result in significant
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cost increases due to increased inspections and cleanup / maintenance operations.
It should be noted that Philadelphia Electric Company has never committed to use ANSI N 45.2.2, " Packaging, Shipping, Receiving, Storage and Handling of Items for Nuclear Power Plants.," for Limerick Generating Station. -
Accordingly, an alternate storage method was implemasted to allow storage of carbon steel pipe without end caps and to place emphasis on post-storage cleaning rather than extensive in-storage maintenance. This method of storage preparation consists of the following:
l 1.
removal of s,ealant tape, end caps, and dessicant from the pipe spools 2.
location of all spools in storage such that they are ' free draining and not.in contact with the ground 3.
where spools are impossible to situate in storage without leaving a " pocket" in which water may be trapped, rain hoods are installed on open ends protruding upward.
l Representative samples of the pipe spools in storage are periodically inspected to assure that the spools are properly stored and for excessive pitting, standing water, adequate cribbing and deterioration of spool identification. Each spool is again inspected for cleanliness prior to ins tallation. Storage maintenance and inspection is performed in accordance
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vith job rule 8031-JR-G-8, summarized above.
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Examinations of pipe stored uncapped shows that although a uniform bloom of rust developed, the pipe still satisfies applicable cleanliness specifications. On the other hand, capped piping which was found to contain standing water developed heavy local ~ deposits of rust. Because pipe stored uncapped allows the pipe interiors to dry, the probability for heavy local rusting or scaling is decreased coupared to capped pipe. Therefore, the minimum wall thickness is less likely to be infringed upon when the pipe spools are stored uncapped.
Measurements of pipe wall corrosion were made to confirm that uncapped-storage does not infringe upon the minimum wall thickness of carbon steel 9,,, ', -
pipe spools. The data, presented in Tables 2 through 5, indicates that corrosion is minimal and does not infringe upon the minimum required wall thickness even when stored uncapped outside, for periods up to 52 months. j, Based on the above, we conclude that outside storage of pipe uncapped is less deleterious than capped storage and meets the requirements set forth in 10 CPR 50, Appendix B, Criterion 13. Inspections during storage) and following cleaning assure that the pipe spools are acceptable for__,/
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. installation. Therefore Philadelphia Electric Company plans to continue the present program for uncapped storage of carbon steel pipe spools at Limerick Generating Station.
If you have any questions or desire additional information, please contact us.
very truly yours, f
y
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- Wy, RRH/rur Attachmen ts O
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Table 1 Insoection Of Pine Scools Stored With Sealed End Caos & Dessicant Lot No.:
1 Pyepared for Storager March 1973 Insoection Date December 1973 Per.issible Rejects Number Failing Remarks First Samole (50 spools) tap 5
3 and, caps (in place & secured) 5 8
unacceptable dessicant saturation 5
h standing water 5
15 unacceptable Second Samole (150 spools) tape 15 1
end caps (in place & secured) 15 10 dossicant saturation 15 1h standing water 15 2h unacceptable Total Lot _
(357 spools) tape 36 26 end caps (in place & secured) 36 3h dessicant saturation 36 39 unacceptable standing water 36 61 unacceptable
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I Table 2 Pipe Spool Wall Corrosion Uncapped Storage Study No.1 (2)
Min. Required Excess b) Final Mirimum Spool Initial Minimum Number Wall Thickness (in)_ Wall Thickness (inl Wall Diickness (in)_ Wall (in)
G3D-13h-1-1 0.h1h 0.h08 0.282 0.126 GBD-13h-1-2 0.333 0 331 0.282 0.0h9 GBD-13h-1-3 0 3h2 0.338 0.282 0.056 GBD-13h-1-h 0.300 0.291 0.282 0.009 Notes:
1.
Initial measurement - November 1972 M111seale was reme,ed fron 'the pipe spools by fabricator prior to shipment 2.
Final measurement - May 1973 Measurements vert: taken following cleaning.
Table 3 Pipe Spool Vall Corrosion - Uncapped Stora6*
Study No. 2
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Spool Initial Minimum (I) Final Minimum Min. Required
, Excess
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Number VallThickness(in) Wall Thickness (in) VallThickness(in) Vall(in)
GJD-101-1-1 0.%6 0.%5 0 319 0.026 GJb101-1-2 0.%6 0.%9 (3) 0 319 0.027 GJb101-123 0 366 0 353 0.319 0.0%
GJ D-101-2-1 '
'0 365 03612 0.319 0.045 HAD-101-1-2 0.366 0 369 (3) 0 328 0.038 HAA101-1-3 0 350 0.%9 0 328 0.021 Notes:
1.
Initial measurement - November 1972 l
l
- M111 scale was removed from the pipe spools by fabricator prior to l
ship =ent.
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2.
Finn 1 measurement - September 1976 Neasurements were taken following cleaning.
3.
Final messarenent is greater than initici measurment due to instrumm.e error and possibility that measurements were not teken
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Tablo h 9
Pipe Spool Vall Corrosion - Uncapped Storage Study No. 3 (5)
Spool.
Initial Minimum Final Min'==
m. Required
' b. cess Number VallThickness(in) VallThickness(in) Wall Thickness (in) Wall (in) 0.790(I) 0.787 0.630 0.157 GED-110-1-2 OED-110-2-2 0750(2) 0 7h7 0.630 0.117 cDD-111-1-2
- 0.743(3) 0 727 0.630 0.097
'O769(b) 0.755 0.630 0.125 CBD-109-2-2 6
Notes i
1.
Initial =easurement - August 1972 1
2.
September 1972 3
December 1972 h.
August 1972 i
5 Final measurement
- February 1977 l
Measurements were taken following cleani,g.
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Pipe Spool Vall Thickness Measurements -
Uncapped Storage i
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Manufacturer's
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MeasuredWall(I)
Minimum Required 8 1 M chess spool Number
( 77
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GEC 107-1-3' o.328 0 3h5 JBD 22h-1-2 0 330 0 360 BBC 16-2-1 0.189 0.255 HBC h7-1-1 0.207 0.225 BC h7-2-2 0.207 0.230 BC h7-3-6 0.207 0.255 HBC h7-2-1 0.207 0.235 uDC h7-3-5 o.207 o.210 HBC h7-1-5 0.207 0.230 BC h7-3-h' O.207 0.220 B C 116-1-3 o.207 o.235 EBC 116-1-3 A 0.207 0.225 EBD 125-1-3 0.2h5 0.280
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HBD 125-1-5 o.2h5 o.280 HED 1h1-1-8 o.189 0.215 HBD 141.-1-h 0.189 0.225 HDD 1ht-1-3 0.189 0.220 JBD 22h-1-1 0 328 o.360 GEE 118-1-1 0 328 0.365 ED 1h1-1-7 0.245 0.280 Notes:
(1) Measurements taken following abrasive blast cleaning prior to installation of pipe spools. Measurement is the minimum of four measurcaents taken on each spool opening.
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(St PARM AVENUE MING OF PRUS$8 A, PENNSYL,V ANI A 19446 DN 50-352 50-353 MEMORANDUM FOR:
G. W. Reinmuth, Assistant Director, Division.of.. Reactor Construction Inspection, IE:HQ w J cr FROM:
R. T. Carlson, Chief, RC&ES Branch, RI r/6R C
SUBJECT:
PIPE STORAGE PRACTICES AT THE LIMERICK GENERATING STATION
References:
1.
Letter K. Kniel to Philadelphia Electric Company, July 14, 1977, same subject.
2.
Letter from Philadelphia Electric Company to K. Kniel. November 4, 1977, same subject.
3.
Memorandum from R. T. Carlson to K. V. Seyfrit, March 31, 1977, same subject (AITS #F12126Hl).
4.
Telephone conversation W. J. Collins, IE:HQ,to J. P. Durr, NRC:I, on December 1,1977.
1 Reference Xabove directed the Limerick Generating Station to discontinue the practice of storing carbon steel piping outside without pipe caps.
This <ircision by NRR was partially based on the finding by IE that the data used by the licensee to justify his storage practices did not adequately substantiate his position. S responded to NRR (Reference % ubsequently, Philadelphia Electric Company
/) stating that they would continue the practice of storing the caroon steel piping outside without endcaps and transmitted five tables of supporting data from studies.
Comparison of Tables 2, 3 and 4 of the licensee's letter with the inspector's original field notes (see Enclosures 1 through d) showsthat this data appears to be the same data presented to IE for review which was rejected due to poor data point correlation and inconclusive results.
In addition, four tables presented to IE originally for review were omitted from the November 4,1977 letter to NRR (Enclosures 7 through 10).
Enclosures 7 and 8 are thickness measurement studie: which show double the corrosien rate for uncapped versus capped pipe.
Enclosures 9 and 10 are coupon weight loss studies which also show a doubled corrosion rate for uncapped versus capped pipe.
We understand Mr. W. J. Collins is reviewing the letter from the licensee.
We suggest that any decisions made regarding the acceptability of the Limerick pipe storage program consider the enclosed data which is provided for infonnation to you.
[2. C.
[y' hRobertT.Ca on, Chief
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7 Reactor Construction and b } h,E j a Engineering Support Branch y
CONTACT:
J. P. Durr, 488-1292 g\\
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G. W. Reinmuth. IE:HQ 2
Enclosures:
As Stated cc:
F. A.' Dreher, IE:HQ {w/encis)
W. J. Collins, IE:HQ 1
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J. P. Durr J. C. Mattia AITS File #F12126H1 O
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L A W E A, N'cg/ 4,/q 7-g, Table ?
4 Pipe Spool Wall Corrosion Uncapped Storage
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Study'No.1 (2)
Min. Required Excess InitialMinimum(1) Final Minimum Number Wall Thickness (in)_ Well Thickness (in1 Wall 'Diickness (inl Vall (in)
Spool GBD-13h-1-1 0.h1h 0.h08 0.282 O.126 G3D-13h-1-2 0 333 0 331 0.282 0.0h9 GBD-13h-1-3 0.3h2 0.338 0.282 0.056 GBD-13h-1-h 0.300 0.291 0.282 0.009 4
Notes:
1.
Initial measurement November 1972
- u11 scale was removed from the pipe spools by fabricator prior to
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shipnest 2.
Final measurement - May 1973 Hessurements were taken following cleaning.
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Tablo 3 Pipe Spool Wall Corrosion - Uncapped Storage Study No. 2 (2)
Min. Required
, Excess Initia~iMinimum(I) Final Minimum Spool Number VallThickness(in) VallThickne'ss(in) Wall Sickness (in) Vall (in) 0.%5 0 319 0.026 CJb101-1-1
.0 346 CJ b101-1-2 0 346 0.%9 (3) 0 319 0.027 GJb101-1-3 0.366 0 353 0 319 0.0%
4 GJ b101-2-1'
'O.365 0 36h 0.319 0.045 HA b 101-1-2 0 366 0 369(3) 0.328 0.038 HAb101-1 -3 0 350 0.%9 0 328 0.021 Notes:
1.
Initial mecsurement - November 1972
- M111 scale was removed f:em the pipe spools by fabricator prior to shipment.
2.
Finni measurement - September 1976 Measurements were taken following cleaning.
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3.
Final measurement is greater than initial acasurement due to instrument error and possibility that measurements were not taken
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Pipe Spool Vall Corrosion - Uncapped Storage Study No. 3
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Mirr. Required tzcess Spool.
Initial Minimum Final Min 4==
Number VallThickness(in) Wall Thickness (in) Wall Thickness (in) Vall (in) 0790()
0 787 0.630 0.157 GBD-110-1-2 03D-110-2-2 0750(#)
0 747 0.630 0.117 0743(3}
0 727 0.630 0.097 CDD-111-1-2
'O.769(b}
0.755 0.630 0.125 GBD-109-2-2 Notes:
1.
Initial =easurement - August 1972 2.
September 1972 3
December 1972 h.
August 1972 5
Finn 1 r.enurement
- February 1977 Measurements were taken following clemi,g.
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SPOOL GJD-101-2-1 HAD-101-1-2 GBD-134-1-2 NO.
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