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 1976 REGULATORY GUIDE
OFFICE OF STANDARDS DEVELOPMENT
REGULATORY GUIDE 4.13 PERFORMANCE, TESTING, AND PROCEDURAL SPECIFICATIONS
FOR THERMOLUMINESCENCE DOSIMETRY:
ENVIRONMENTAL APPLICATIONS
A. INTRODUCTION
result of normal operations. including anticipated operational occurrences, and .s 'the result of Section 20.105, "Permissible levels of radiation in postulated accidents.
unrestricted areas." of 10 CFR Part 20. "Standards for Protection Against Radiation." provides limits on "hernioluninescence dcs!m'§krp (TlD) is widely levels of radiation in unrestricted areas resulting from used to measure levels o ~fý4X`d-gnnia radiation in possession, use. or transfer or NRC-licensed radioac- the environs of NRC41icenkd nui61iear facilities. This tive material. Section 20.106, "Radioactivity in ef- guide provides miniimuni acceptable performance fluents to unrestricted areas," of 10 CFR Part 20 criteria for TLD.sysirns used for this purpose. It also prohibits a licensee from releasing to an unrestricted provides proeederes f-caibration, field application.
area radioactive materials in concentrations that ex- and reporting,-\'" ;
ceed limits specified in 10 CFR Part 20 except as otherwise authorized in a license issued by the Com- \ ,
l. DISCUSSION
mission. Section 20.201. "Surveys." of 10 CFR Part 20 further requires that a licensee conduct surveys as, Wikjbg Gioup 9 of the Health Physics Society may be necessary to comply with the regulations of Z',`. nd,4.rdiý1Committee for American National Stan-
10 CFR Part 20 including, when appropriate, the *I ain Committee (ANSI) N13 on Radiation measurement of levels of radiation. ,. . Plection has prepared a standard that specifies
- ;.*minhmurm acceptable performance of TLDs used for Section IV.B of Appendix I, "Numerical G1.4 s '*nvironrnental mt'asurements: outlines methods to for Design Objectives and Limiting Cor04ti'iohs gy test for compliance: and provides procedures for Operation to Meet the Criterion 'As A.0ow A Is calibration, field application, and reporting. This Reasonably Achievable' for Radioactivea eri4l in standard was prepared under the direction of the Light-Water-Cooled Nuclear Power Re'tGOP"Ef- Health Physics Society Standards Committee and fluents." to 10 CFR Part 50, "Licensing of Produc- was processed and approved for submittal to ANSI
tion and Utilization Fa*'es," requires that by the American National Standards Committee on licensees establish appr fi- surveillance and Radiation Protection. NI1. It was subsequently ap- monitoring programs to oŽn measurable proved and designated N545-1975 by the ANSI
levels of radiation a io i.e materi,fls in the en- Board of Standards Review on August 20. 1975.1 vironment, The specification of performance criteria of ther- General i*iW ion 64, "Monitoring moluminescence dosimetry and the verification of the radioactivit e es, of' Appendix A, "General actual performance require appropriate statistical Design Crite or Nuclear Power Plants," to 10
'ANSI N545-1975, "P'erfornmance. Testing. and Procedural CFR Part 50 uires that nuclear power plant Spcificalion Fir Th,:rlnoluminesrencrt: Dou.imetry (Envirdnniciltal designs provide means for monitoring the plant en- Applications)'" moly he (iblaind From the Americain Naliontal virons for radioactivity that may be released as the 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. Washington. 0 C 2055, Attention Docketlrg and Asguatoy Gudearei~sud t decrib An mae anitate o th pul'c Serivice Section methods acceptable to ihe. IRC staff of implementing sppcihic pe'-t.of ine S Se*tion Commission'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 apphi cants. Regulatory Guides ate not substitutes tot regulations, and compliance I Power Reactors 6 Piuducls with 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 Heallh the isr.ance or conlinuance ola permit or license by the Commission 4 EnvlronmentAlend Siling 9 Antitiust Review Comments and suggestions fot improvements in these guides ate encouraged 6 Matetials arid Plant Protection 10 General at all times, and guides will be revised, as appropriate, to accommodate com meits and to reflect new information or eopetience However. comnitnts on Copies of published guides may be obtained by written request indrcatirrg the this guide, io received within abuul two nmonths after its issuance, will be part divisions desired to the U S Nuclear Regulatory Conintlision. Washingtonr. 0 f ticultaly useful in evaluatrng the need for art early revision 205. Attention ODrector. Office of Standards Development
concepts and techniqu,.-s. Because w!de applicability 2. Instead of Section 3.1 of ANSI N545-1975, the is intended. ANSI N545. 1975 as well as the provi- following should be used: "The performance of the sions and clarifications given below in the regulatory TLD system shall be determined under laboratory position are confined to simple statistical concepts conditions and in a known radiation field with an ex- and prescribe no specific statistical techniques. In posure equal to that resulting from an exposure rate fact. the implem-.-ntation of some specifications by of 10 p R/hr during the field cycle. Ninety-five per- rigorous statistical methods may prove difficult for cent of the measurements shall fall within 10% of the some users of the guide. Therefore, good approx- known exposure."
imate statistical methods are acceptable.
3. Instead of Section 3.3 of ANSI N545-1975, the No specific criteria for good approximation are following should be used: "Ninety-five percent of the prescribed. However. the user should judge whether final value-:- (after all appropriate corrections to the the sample site is adequately large for the approxima- measurements are applied, including those for errors tion and w%+-ether the distribution of the measure- expect.d under field conditions) shall differ from the m'ents is sutfiiently close to that assumed in the correct value by less than 30% of the correct value."
analysis. Pr(.blems relating to underlying distribu- tions can he 'tvoided by the use of nonparametric 4. Instead of Section 4.3.1 of ANSI N545-1975.
methods Some .-f the specifications which are stated the folLwing should be used: "Uniformity shall be in terms of standard deviations can be reformulated determined by giving TLDs from the same batch an in nearly equivalent specifications for tolerance limits exposure equal to that resulting from an exposure for %%hich simple nonparametric methods are rate of 10 a R/hr during the field cycle. The response available. Such reformulations are also acceptable. obtained shall have a relative standard deviation A. [Iaid: and WV.J. Conover' are useful reference (coefficient of variation) of less than 7.5%."
sources for parametric and nonparametric methods.
respectively. 5. Instead of Section 4.3.2 of ANSI N545-1975, the following should be used: "Reproducibility shall If every TLD i; individually calibrated, the popula- be determined by givinL- one TLD repeated exposures tion parameters for certain errors can be computed equal to that resulting from an exposure rate of 10
directly, and statistical inference is not needed for p R/hr during the field cycle. The responses shall specifications relating to these errors. have a relative standard deviation (coefficient of variation) of less than 3.0%."-
C. REGULATORY POSITION
The requirements and recommendations for per- formance specifications. testing procedures. calibra-
D. IMPLEMENTATION
tion procedures, field procedures, and reporting procedures that are included in ANSI N545-1975 are The purpose of this section is to provide inrorma- generally acceptable to the NRC staff as the basis for tion to applicants and licensees regarding the staffs using thermoluminescence dosimetry for the plans for utilizing this regulatory guide.
measurement of X and gamma: radiation in the en- virons of NRC-licensed facilitir:.- subject to the fol- Except in those cases in which the applicant lowing additional provisiu.is :J qualificati~ms. proposes an acceptable alternative method for com- plying with specified portions of the Commission's
1. Section 3. -IPerforma..,e Specifications." of regulations, the method described herein will be used ANSI N 545-1975 should bt' cupplemented by the fol- in the evaluation of operating license applications lowing statement: "Each pt rformance specification docketed after July 15, 1977.
shall be verified at the 95% confidence level."
If an applicant wishes to use this regulatory guide A. [laid. Stati.;tical "lhior'v 'ith Eiginierint ..lpplicatimts. John in developing submittals for applications docketed on k\\ e% & sons. Inc.. 1t52. or before July 15. 1977, the pertinent portions of the
'\%. J. (d'ono.er. Iracci .\'operait,'tri .ttijis. John Wiley & application will be evaluated on the basis of this sn.qo, Inc.. I19T1. guide.
4.13-2