Regulatory Guide 4.13
| ML13350A201 | |
| Person / Time | |
|---|---|
| Issue date: | 11/30/1976 |
| From: | Office of Nuclear Regulatory Research |
| To: | |
| References | |
| RG-4.013 | |
| Download: ML13350A201 (2) | |
U.S. NUCLEAR REGULATORY
COMMISSION
November
1976REGULATORY
GUIDEOFFICE OF STANDARDS
DEVELOPMENT
REGULATORY
GUIDE 4.13PERFORMANCE,
TESTING,
AND PROCEDURAL
SPECIFICATIONS
FOR THERMOLUMINESCENCE
DOSIMETRY:
ENVIRONMENTAL
APPLICATIONS
A. INTRODUCTION
Section 20.105, "Permissible levels of radiation inunrestricted areas." of 10 CFR Part 20. "Standards for Protection Against Radiation."
provides limits onlevels of radiation in unrestricted areas resulting frompossession, use. or transfer or NRC-licensed radioac-tive material.
Section 20.106, "Radioactivity in ef-fluents to unrestricted areas," of 10 CFR Part 20prohibits a licensee from releasing to an unrestricted area radioactive materials in concentrations that ex-ceed limits specified in 10 CFR Part 20 except asotherwise authorized in a license issued by the Com-mission.
Section 20.201. "Surveys."
of 10 CFR Partresult of normal operations.
including anticipated operational occurrences, and .s 'the result ofpostulated accidents.
"hernioluninescence dcs!m'§krp (TlD) is widelyused to measure levels o ~fý4X`d-gnnia radiation inthe environs of NRC41icenkd nui61iear facilities.
Thisguide provides miniimuni acceptable performance criteria for TLD.sysirns used for this purpose.
It alsoprovides proeederes f-caibration, field application.
and reporting,-\'"
- \ ,
l. DISCUSSION
20 further requires that a licensee conduct surveys as, Wikjbg Gioup 9 of the Health Physics Societymay be necessary to comply with the regulations of Z',`. nd,4.rdiý1Committee for American National Stan-10 CFR Part 20 including, when appropriate, the ain Committee (ANSI) N13 on Radiation measurement of levels of radiation.
,. .Plection has prepared a standard that specifies acceptable performance of TLDs used forSection IV.B of Appendix I, "Numerical G1.4 s mt'asurements:
outlines methods tofor Design Objectives and Limiting Cor04ti'iohs gy test for compliance:
and provides procedures forOperation to Meet the Criterion
'As A.0ow A Is calibration, field application, and reporting.
ThisReasonably Achievable'
for Radioactivea eri4l in standard was prepared under the direction of theLight-Water-Cooled Nuclear Power Re'tGOP"Ef- Health Physics Society Standards Committee andfluents."
to 10 CFR Part 50, "Licensing of Produc- was processed and approved for submittal to ANSItion and Utilization requires that by the American National Standards Committee onlicensees establish appr fi- surveillance and Radiation Protection.
NI1. It was subsequently ap-monitoring programs to on measurable proved and designated N545-1975 by the ANSIlevels of radiation a io i.e materi,fls in the en- Board of Standards Review on August 20. 1975.1vironment, General i *iW ion 64, "Monitoring radioactivit e es, of' Appendix A, "GeneralDesign Crite or Nuclear Power Plants,"
to 10CFR Part 50 uires that nuclear power plantdesigns provide means for monitoring the plant en-virons for radioactivity that may be released as theThe specification of performance criteria of ther-moluminescence dosimetry and the verification of theactual performance require appropriate statistical
'ANSI N545-1975,
"P'erfornmance.
Testing.
and Procedural Spcificalion Fir Th,:rlnoluminesrencrt:
Dou.imetry (Envirdnniciltal Applications)'"
moly he (iblaind From the Americain Naliontal Standards Inslilttul.
1430 Bro:dway, New York. New Yoirk t(X)IX.USNRC REGULATORY
GUIDES Comments should be sent to the Secretary of the Commission.
U.S. Nuclea,Regulatory Guides are issued to describe and make available to the public ARgulatoty Commission.
0 C 2055, Attention Docketlrg andAsguatoy Gudearei~sud t decrib An mae anitate o th pul'c Serivice Sectionmethods acceptable to ihe. IRC staff of implementing sppcihic pe'-t.of ine S Se*tionCommission's regulations, to delineate techniques used by the staf.f i eyrelu 1he guide% are issued in the following ten broad divi.iolls sting specific problems or postulated accidents Ot to provide guidrnce to apphicants. Regulatory Guides ate not substitutes tot regulations, and compliance I Power Reactors
6 Piuduclswith them is not required Methods and solutions dliffelrent from those set on't in 2. Research and Test Reactors I Ttanspocietlnn the guides wilt be acceptable if they provide a basis lot the findings teqwus.te to 3 Fuels and Matetials Facilities
8 Uccupational Heallhthe isr.ance or conlinuance ola permit or license by the Commission
4 EnvlronmentAlend Siling 9 Antitiust ReviewComments and suggestions fot improvements in these guides ate encouraged
6 Matetials arid Plant Protection
10 Generalat all times, and guides will be revised, as appropriate, to accommodate commeits and to reflect new information or eopetience However.
comnitnts on Copies of published guides may be obtained by written request indrcatirrg thethis guide, io received within abuul two nmonths after its issuance, will be part divisions desired to the U S Nuclear Regulatory Conintlision.
Washingtonr.
0 fticultaly useful in evaluatrng the need for art early revision
205. Attention ODrector.
Office of Standards Development concepts and techniqu,.-s.
Because w!de applicability is intended.
ANSI N545. 1975 as well as the provi-sions and clarifications given below in the regulatory position are confined to simple statistical conceptsand prescribe no specific statistical techniques.
Infact. the implem-.-ntation of some specifications byrigorous statistical methods may prove difficult forsome users of the guide. Therefore, good approx-imate statistical methods are acceptable.
No specific criteria for good approximation areprescribed.
However.
the user should judge whetherthe sample site is adequately large for the approxima- tion and w%+-ether the distribution of the measure-m'ents is sutfiiently close to that assumed in theanalysis.
Pr(.blems relating to underlying distribu- tions can he 'tvoided by the use of nonparametric methods Some .-f the specifications which are statedin terms of standard deviations can be reformulated in nearly equivalent specifications for tolerance limitsfor %%hich simple nonparametric methods areavailable.
Such reformulations are also acceptable.
A. [Iaid: and WV. J. Conover'
are useful reference sources for parametric and nonparametric methods.respectively.
If every TLD i; individually calibrated, the popula-tion parameters for certain errors can be computeddirectly, and statistical inference is not needed forspecifications relating to these errors.C. REGULATORY
POSITIONThe requirements and recommendations for per-formance specifications.
testing procedures.
calibra-tion procedures, field procedures, and reporting procedures that are included in ANSI N545-1975 aregenerally acceptable to the NRC staff as the basis forusing thermoluminescence dosimetry for themeasurement of X and gamma: radiation in the en-virons of NRC-licensed facilitir:.-
subject to the fol-lowing additional provisiu.is
- J qualificati~ms.
1. Section 3. -IPerforma..,e Specifications."
ofANSI N 545-1975 should bt' cupplemented by the fol-lowing statement:
"Each pt rformance specification shall be verified at the 95% confidence level."A. [laid. Stati.;tical
"lhior'v
'ith Eiginierint
..lpplicatimts.
Johnk\\ e% & sons. Inc.. 1t52.'\%. J. (d'ono.er.
Iracci .\'operait,'tri
.ttijis.
John Wiley &sn.qo, Inc.. I19T1.2. Instead of Section 3.1 of ANSI N545-1975, thefollowing should be used: "The performance of theTLD system shall be determined under laboratory conditions and in a known radiation field with an ex-posure equal to that resulting from an exposure rateof 10 p R/hr during the field cycle. Ninety-five per-cent of the measurements shall fall within 10% of theknown exposure."
3. Instead of Section 3.3 of ANSI N545-1975, thefollowing should be used: "Ninety-five percent of thefinal value-:-
(after all appropriate corrections to themeasurements are applied, including those for errorsexpect.d under field conditions)
shall differ from thecorrect value by less than 30% of the correct value."4. Instead of Section 4.3.1 of ANSI N545-1975.
the folLwing should be used: "Uniformity shall bedetermined by giving TLDs from the same batch anexposure equal to that resulting from an exposurerate of 10 a R/hr during the field cycle. The responseobtained shall have a relative standard deviation (coefficient of variation)
of less than 7.5%."5. Instead of Section 4.3.2 of ANSI N545-1975, the following should be used: "Reproducibility shallbe determined by givinL- one TLD repeated exposures equal to that resulting from an exposure rate of 10p R/hr during the field cycle. The responses shallhave a relative standard deviation (coefficient ofvariation)
of less than 3.0%."-
D. IMPLEMENTATION
The purpose of this section is to provide inrorma-tion to applicants and licensees regarding the staffsplans for utilizing this regulatory guide.Except in those cases in which the applicant proposes an acceptable alternative method for com-plying with specified portions of the Commission's regulations, the method described herein will be usedin the evaluation of operating license applications docketed after July 15, 1977.If an applicant wishes to use this regulatory guidein developing submittals for applications docketed onor before July 15. 1977, the pertinent portions of theapplication will be evaluated on the basis of thisguide.4.13-2