ML19309A062
| ML19309A062 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 08/28/1970 |
| From: | Rodgers J FLORIDA POWER CORP. |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML19309A063 | List: |
| References | |
| NUDOCS 8003240897 | |
| Download: ML19309A062 (5) | |
Text
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FJorida Power Corporation o^TE OF DOCUMENT; DATE RECmED NOJ St. Pete-shurg, Florid 8-28-70 o ' *f0
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Dear Sir:
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In re: Florida Power Corporation Crystal River Nuclear Generating Plant Regulatery Filo Cy.
Docket No. 50-302 Enclosed are three (3) executed originals and nineteen (19) conformed copies of Amendment No.10 consisting of Part III of Supplement No. 5, two insert pages to Supplement No. 5 to the Preliminary Safety Analysis Report, and the remaining information requestad in your letter of March 13, 1970. Also enclosed are an additional eighty one (81) copies of each for updating the balance of the copics of the Preliminary Safety Analysis Report filed with the original application.
Amendment No. 10 supplements the Preliminary Safety Analysis Report so as to include the latest design information for your continuing review.
Amendment No. 10 material includes two amended pages (x and xi) and Part III of The Prescon Corporation's presentation on " Tests on 1170 Ton Prescon Tendons". This information completes The Prescon Corporation's report on the tendon system.
In accordance with a request noted in your letter of March 13, 1970, the prestressing system anchorage component " materials description and fabrication process summary" is as follows:
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--2 August 28, 1970 Materials Description The acceptance criteria and the proposed materials for the anchorage components is es follows:
fy fu Component (ksi)
(ksi)
NDTT Location Material min.
min.
(max)
Bearing 50 90
-15'F Mat only ASTM A533 Grade B Class 2 Plate All others Modified Armco VNT (Covered by proposed ASTM A633-E single normalized)
Dead End 50 90
-15'F All Modified Armco VNT (Covered by proposed ASTM A633-E double normalized)
Shims 50 90
-15'F All Modified Armco VNT (Covered by propos ed ASTM A633-2) 3" plate sing 39 normalized, 4" plate double normalized Stressing 60 100
-15*F All Either Q & T Alloy steel Washer forging, chemistry of ASTM A514 type E - double quenched and tempered or Luken's Q & T Alloy steel plate ASTM A517, Gr. F)2(Modified Chemical composition for modified Armco VNT:
Carbon 0.25% maximum Nitrogen 0.01% to 0.02%
Manganese 1.30% to 1.65%
Phosphorus 0.035% maximum Vanadium 0.12% to 0.17%
Sulfur-0.040% maximum Silicon 0.15% to 0.30%
Modifications to ASTM A517, Grade F:
Chemistry --_ Max. N - 1.5%, Max. Mn - 1.3%
Gage - 6 inches thick Physical Properties - as above The above criteria were developed in conjunction with the tendon test program reported in Supplement 5 to the Preliminary Safety Analysis Report.
The ' Director Division of Reactor Licensing August 28, 1970 Fabrication of Anchorage Components Fabrication Process Summary 1.
Bearing Plates:
a.
Plate is flame-cut to size.
b.
Central hole is flame-cut.
c.
Mounting holes are jig-drilled and tapped.
d.
Trumpet is positioned concentric with central hole and welded using a seal weld.
2.
Dead End Plates:
a.
Plate is flame-cut to size.
b.
Mounting holes are jig-drilled.
c.
Wire holes are drilled.
3.
a.
Plate is flame-cut to size.
4.
Stressing Washers:
I.
Forging a.
Billet is cut and forged.
4 b.
Forging is double quenched and tempered.
The heat treated forging is threaded externally, c.
d.
Wire holes are drilled.
e.
Mounting holes are jig-drilled and tapped.
II.
Plate The double quenched and tempered plate is preheated and' the a.
stressing washer cut from plate, b.
. Stressing washer is stress relieved af ter flame cutting.
The Director Division of Reactor Licensing August 28, 1970 c.
Stressing washer is threaded externally.
d.
Wire holes are drilled.
e.
Mounting holes are jig-drilled and tapped.
Ef fects of Fabrication 1.
Flame Cutting:
Results of tests and studies by AWS and ASME show that flame cut surfaces of low carbon content (less than 0.25%) and low alloy steels are at least equal in mechanical properties to the uncut metal.
(See AWS Handbook, Section 3A of the Sixth Edition).
2.
Welding:
The welding procedures and operators were qualified under the ARS recom-mended practices. The effects of welding upon the mechanical properties are not detrimental due to the low carbon content.
3.
Machining (drilling, tapping, threading):
Production type components were tested and reported in Supplement No. 5.
No detrimental effects on the machined surfaces were noted.
4.
Stress Relieving (Stressing washer cut from plate):
The stressing washer is heated in a furnace to approximately 1150*F and held for sufficient time to reduce the surface hardness for subsequent threading operations.
The prestressing system anchorage component materials listed above meet the criteria as outlined in our letter of March 4,1970.
Very truly yours,
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J. T. Rodgers Nuclear Project Manager JTR/sd l
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