ML19221A846
| ML19221A846 | |
| Person / Time | |
|---|---|
| Issue date: | 12/28/1972 |
| From: | NRC OFFICE OF STANDARDS DEVELOPMENT |
| To: | |
| References | |
| REGGD-01.015, REGGD-1.015, NUDOCS 7907100086 | |
| Download: ML19221A846 (2) | |
Text
Revision 1 12/28/72 9
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REGL XO RY G 300E U.S. ATOMIC ENERGY COMMISSION s
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DiRinCTORATE OF RILQUL.ATORY STANDARDS m
g REGULATORY GUIDE 1.15 TESTING OF REINFORCING BARS FOR CATEGORY I CONCR ETE STRUCTURES' A. INTRODUCTION specimens mdicates that the tensile and yield strengths of the fu'.1 ciameter bars may be lower than the values Geners! Design Critecion 1 of Appendix A to 10 that are obtained using reduced diameter specimens. The CFR Part 50, " General Design Criteria for Nuclear uriations are generally greater in bar sues No.14 and Power Plants," requires that structures, systems and larger. Thus, the euluation of the design marpn of components important to safety be designed, fabricated, s.:fety in the structure may not be conservatne if it is erected, and tested to quality standards commensurate based upon test results obtamed from reduced diameter with the importance of the safety function to be specirnens.
performed. his guide desenbes an acceptable me. hod for implementing this criterion with reprd to tests and
- Ti 4 A-615 72 requires only one tension test inspections of reinforcing bars for Category I concrete speci a per heat if all bars from a single heat differ in structures.8 The Advisory Committee on Reactor sue by less than three designation numbers. only two Safeguards has been consulted conceming this guide and specimem are required in other cases. Because each heat has concurred in the reguletr/ pcMtion.
may contam from 50 to 250 tons of steel, the fraction of the reinforcing bars that are tested may vary by a B. D'fCUSSION factor of 5. A more consistent basis for samp! ng can be 9
obtained by choosmg the test specimens on the basis of The tenstle strength of concrete structures the number of reinforcing bars or the weight of
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important to sa'ety depends upon reinforcing bars reinforctng.
imbedded in the concrete. The ccntnbution of the concrete to dse tensile strength of the structure is S ecial chemistry requirements have occasionally P
minima' and thus generally disreprded. The tensile en P acM on some remforemg ban,aM deM M l
strength of reinforcing bars is usually tested in e made h any se repem are Mng met accordance with ASTM A-615 72,
" Standard Specification for Deformed Billet-Steel Bars for Since s me mecharu. cal splice configurztions may-Concrete Reinforument". American Society for Testing requ:re deformations that exceed the minimum and Materis!s. This specificaticn permits the tensile test requirements set f rth in ASTM A-615-72. it is specimens to be either of full bar diameter or of a imp rtant t inspect the deformations to assure that reduced diameter. Comparison of test data obtained I
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with both full bar diameter and reduced diameter C. REGULATORY POSITION
' This guide is a revision of former Safety GuJde 15. As such, it is a;clicable to water <colod nuclear power reactors.
- i. YieM Strength and Tessae Strength Tests
' Structures, systams, and components of a nuclear power Remforcmg bars used for concrete structures P ant are designated as Catsgory I if they are designed to important to safety should be tested to venfy their yielJ l
withstand the effects of the Safe Shutken Earthquaks (SSE) and remain runctional. See Safety GWde 29. " Seismic Design strength and tensile strength as follows.
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At least one full diameter specimen from each or constructor, the reinforcing bar Anistry should be a.
b.tr size should be tested for each 50 tons or fraction controCed to the extent required to achieve the deured thereof of remforcing bars that are produced from each matenal property, and confirmatory testing should be heat and used in Category I structures.
performed.
b.
The test procedures should be in accordance with ASTM A 37048, " Standard Methods and 2.
Deformadon larpections Defirutions for Mechanical Testing of Steel Products,"
American Society for Testing and Materials.
Deformations on the reinforcing bars should be c.
The acceptance standards should be in inspected to assure their compliance with ASTM accordance with ASTM A415 72,
" Standard A415-72 and with the liansee's speaficatons pertinent Speaficaton for Deformed BdictSteel Bars for to bonding and other purposes which are dependent on Conaete Reinforcement," American Society for Testing the deforrnation characteristics.8 and Matenals, induding Supplemental Requirement (S-1), usmg full sections of the b.rs as rolled.
' Adepacy I der mens for sp M as wm W d Where anY material Pr P'rty such as yield-demonstrated by the tensde tests of the mechanscal spbce. See strength-to tensue<trength ratio. ductihty, weldabili7 safety GWde to," Mechanical (Gamu) spuces in Reinforcine or other sundar property is relied upon by the designer Bars of Qteeory I conaete structwes."
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1.15-2