ML19246B050
| ML19246B050 | |
| Person / Time | |
|---|---|
| Issue date: | 06/30/1973 |
| From: | NRC OFFICE OF STANDARDS DEVELOPMENT |
| To: | |
| References | |
| REGGD-03.009, REGGD-3.009, NUDOCS 7907110273 | |
| Download: ML19246B050 (2) | |
Text
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June 1973 i-U.S. ATOMIC ENERGY COMMISSION Ot d R EG L : A :'O RY G A D E a
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DIRECTORATE CF REGULATORY STANDARDS REGULATORY GUIDE 3.9 CONCRETE RADIATION SHIELDS A. INTRODUCTION Design. Construe non and Ope rati an Critena. ano it w n subsequen tly apprmed by the Amerman %tnm!
Section 20.101 of 10 CFR Part 20. " Exposure of Standards Institute ( -\\NSl i on December ::. iC Indmduals to Radiation m Restucted Areas." states that and desienaied \\NSI N i u l b-F: The standM no Ikensee shall possess. use, or t ransfer hcensed discusses agae;aw desien or con retc ;m u ures and matenal m su<h a manner as to cause any indmdualin a forms, platemem m e 4 nae'e. design and maall Aio:
restucted area to receive a dose m excess of the hmits penetrations. embedments. metal Imers. and pene"atmr.
speaned therein. Paragraph (c) of % 20.1 prendes that plugs and outtmn testmg and quahty assuranse lic e n se e s.
in addition to comply ing with the proustons needed to serity tbat the desned quahts of requirements set forth m Part 20 make every reasonable design and constru.non has been achieved The standard ettort to mamtam radiation exposures as far below the does not melude detatled treatments of structural desyn hmits specified m this part as practicable.
or determination ot shield thwkness Concrete radiation shields can be installed m nuclear C. REGUL ATORY POSITION faahties such as hot laboratones, radiochemical plants, expenmental facihties. and nuclear fuel fabrication The requirements and recommended practices barner between personnel and c ntained m ANSI N101 AIC2, " Concrete RaJutmn plants to prondt a
radiation sources for the purpose cf reducmg doses of Shields."'
are a < ceptable ter the censt r uc t mn or mnump radiation received by personnel to as low as ra diation shieldmg structures for hot labo ra t ones.
pracocable levels. This guide desenbes practias for the radiochemical piants, expenmental f aahties. and auJear wnstruction of concrete radiation shielding structures fuel f bncatmn plann suheci to the f ollowmg f or such nuclea faahties, wfuch are acceptable to the Regulatory staf f as methods of complymg,in part,with C ommission regulations with regard to reducing 1.
Section 2 ot ANSI N101 w!C: hsts appheable riJunon exposures. Much of the information meluded document s wnah are mtended to supplement this may be apphcable to shieldmg structures for reactors standard. The speatic appheabihty or a ccept ab tht y of and other nuclear and nonnuclear facdities which require these hsted documents has been or will be cosered wncrete radunon shields.
separately m other reculatory guides or in Commission regulanons. where apprornate B. DISCUSSION 2.
Sect ion a x 01 ANSI Nio! 6.lC2 Jelmeates speaal S u bc ommit tee ANS-l l. Radioact ye Matenals precautions to be obsen e d m the const ru. t m t !
Handhng Faahties and Speciahzed Equipment, of the concrete radunon shields. Where steel er other me t a3 Amenean Nudear Society has developed a standard are used as aggregate to inacase the density a the presntmp requirements and recommended practices for concrete. the metal should be of such ty pe that it will or other explosise gases to be the const ruction of concrete radiation shielding not cause hy drogen structures and for certain elements of design that relate generated by reamtmn with the cement.
io problems umque to this type of structure. This approved by the American National
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-b.n ned f rom the Ameman N u lea s t an da rd w as Standards Eomnuttee N101 Atomic Industry Faaht)
- s. men. 2M i N OcJen benue. H nsdale. Wme M5 2 t USAEC REGULATORY GUIDES cop.es o+ pubiisw en=s me, c. obte *o b, eauw.nd -e -o ~ de.sm dos. red to t he US A to mic E aergy Cam %ss On W esm ag' o e Of 2P4s A r'emon D>res t y of R agu + e t m, Pen.ss as Comnead end suggrs bo as 6 R ogue r or y (, uedes ar e.ssved to Ocect.be end crue e owedeble to tre pubhc
'awwwemaats in t*ese guidas see encouraged end shouad te seat to W seve aw Ne 'o the A E C Repator y steH of.mpeesneet.rg spW4 ports Of A or%C Em gv Commrss oa W esN ng' an DC 2 Pas of the Comethgemon U$
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tPe prW9 eH be stopplebse.f they provide e bee <s f or the fitwfings regesite to 1 Poveer Reactu t%.1euence or feat' nuance of a per1*t or lerence by the CornmHgeon 7 T r e isport e+ on 2 Researce enr1 T est Hearto, s 3 F we's erw1 Mete
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3.
Section 6.4 of ANSI N101.0-1472 does not explain 4.
Section 8.7.1 of ANSI NIGI.6-1972 states, in part.
how some of the variables aluch are used in the that reinforemg steel or other means be prosided for equations for bending moment and tensile stress are to transferrmg shear forces through a construction jomt.
be determmed. Therefore this section should not be used ibis requirement is not sufficient. Provision should be as a substitute for detailed thermal stress analysis in the made for adequate means of transfernng shear and oti.cr design of tempe rature reinforcement for control of forces through the joint.
crack'ing in specifie concrete radiation sluelds.
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