Regulatory Guide 4.13: Difference between revisions

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{{Adams
{{Adams
| number = ML003739935
| number = ML13350A201
| issue date = 07/31/1977
| issue date = 11/30/1976
| title = Performance,Testing & Procedural Specifications for Thermoluminescence Dosimetry:Environmental Applications
| title = Performance, Testing, and Procedural Specifications for Thermoluminescence Dosimetry: Environmental Applications
| author name =  
| author name =  
| author affiliation = NRC/RES
| author affiliation = NRC/RES
Line 10: Line 10:
| license number =  
| license number =  
| contact person =  
| contact person =  
| document report number = RG-4.13 Rev 1
| document report number = RG-4.013
| document type = Regulatory Guide
| document type = Regulatory Guide
| page count = 4
| page count = 2
}}
}}
{{#Wiki_filter:Revision 1 U.S. NUCLEAR REGULATORY COMMISSION                                                                                       July 1977 REGULATORY GUIDE
{{#Wiki_filter:U.S. NUCLEAR REGULATORY COMMISSION
                                      OFFICE OF STANDARDS DEVELOPMENT
November 1976 REGULATORY GUIDE
                                                                    REGULATORY GUIDE 4.13 PERFORMANCE, TESTING, AND PROCEDURAL SPECIFICATIONS
OFFICE OF STANDARDS DEVELOPMENT
                                                  FOR THERMOLUMINESCENCE DOSIMETRY:
REGULATORY GUIDE 4.13 PERFORMANCE, TESTING, AND PROCEDURAL SPECIFICATIONS
                                                              ENVIRONMENTAL APPLICATIONS
FOR THERMOLUMINESCENCE DOSIMETRY:
ENVIRONMENTAL APPLICATIONS


==A. INTRODUCTION==
==A. INTRODUCTION==
criteria for TLD systems used for this purpose. It also provides procedures for calibration, field application,                                I*
Section 20.105, "Permissible levels of radiation in unrestricted areas." of 10 CFR Part 20. "Standards for Protection Against Radiation." provides limits on levels of radiation in unrestricted areas resulting from possession, use. or transfer or NRC-licensed radioac- tive material. Section 20.106, "Radioactivity in ef- fluents to unrestricted areas," of 10 CFR Part 20
      Section 20.105, "Permissible levels of radiation in                                   and reporting. It does not apply to TLD systems used unrestricted areas," of 10 CFR Part 20, "Standards                                       for the purpose of determining occupational ex for Protection Against Radiation," provides limits on                                     posure.
prohibits a licensee from releasing to an unrestricted area radioactive materials in concentrations that ex- ceed limits specified in 10 CFR Part 20 except as otherwise authorized in a license issued by the Com- mission. Section 20.201. "Surveys." of 10 CFR Part result of normal operations. including anticipated operational occurrences, and .s 'the result of postulated accidents.


levels of radiation in unrestricted areas resulting from                                                             
"hernioluninescence dcs!m'§krp (TlD) is widely used to measure levels o
~fý4X`d-gnnia radiation in the environs of NRC41icenkd nui61iear facilities. This guide provides miniimuni acceptable performance criteria for TLD.sysirns used for this purpose. It also provides proeederes f-caibration, field application.


==B. DISCUSSION==
and reporting,-\\'"  
possession, use, or transfer of NRC-licensed radioac tive material. Section 20.201, "Surveys," of 10 CFR                                            Working Group 9 of the Health Physics Society Part 20 further requires that a licensee conduct sur                                      Standards Committee for American National Stan veys as may be necessary to comply with the regula                                        dards Institute (ANSI) Committee N 13 on Radiation tions of 10 CFR Part 20 including, when appropriate,                                      Protection has prepared a standard that specifies the measurement of levels of radiation.                                                  minimum acceptable performance of TLDs used for Paragraph IV.B(2) of Appendix I, "Numerical                                          environmental measurements; outlines methods to Guides for Design Objectives and Limiting Condi                                          test for compliance; and provides procedures for tions for Operation to Meet the Criterion 'As Low As                                      calibration, field application, and reporting. This Is Reasonably Achievable' for Radioactive Material                                        standard was approved by the N13 Committee. It in Light-Water-Cooled Nuclear Power Reactor Ef                                            was subsequently approved and designated N545 fluents," to 10 CFR Part 50, "Licensing of Produc                                          1975, by ANSI on August 20, 1975.1 tion and Utilization Facilities,"                                requires that
;
,,
\\
                                                                                                  The specification of performance criteria of ther licensees establish appropriate surveillance and                                          moluminescence dosimetry and the verification of the monitoring programs to provide data on measurable                                        actual performance require appropriate statistical levels of radiation and radioactive materials in the en                                  concepts and techniques. Because wide applicability vironment.                                                                                is intended, ANSI N545-1975 as well as the provi sions and clarifications given below in the regulatory General Design Criterion 64, "Monitoring radioactivity releases," of Appendix A, "General                                        position are confined to simple statistical concepts Design Criteria for Nuclear Power Plants," to 10                                          and prescribe no specific statistical techniques. In fact, the implementation of some specifications by CFR Part 50 requires that nuclear power plant                                            rigorous statistical methods may prove difficult for designs provide means for monitoring the plant en virons for radioactivity that may be released as the                                      some users of the guide. Therefore, good approx result of normal operations, including anticipated                                        imate statistical methods are acceptable.
,l.


operational occurrences, and as the result of postulated accidents.
DISCUSSION
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.


* Lines indicate substantive changes from previous issue.
,.
. 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, General i *iW
ion
64,
"Monitoring radioactivit e
es, of' Appendix A, "General Design Crite or Nuclear Power Plants," to 10
CFR Part 50
uires that nuclear power plant designs provide means for monitoring the plant en- virons for radioactivity that may be released as the The specification of performance criteria of ther- moluminescence dosimetry and the verification of the actual performance require appropriate statistical
'ANSI
N545-1975,
"P'erfornmance.


'ANSI N545-1975, "Performance, Testing, and Procedural Thermoluminescence dosimetry (TLD) is widely                                          Specification for Thermoluminescence Dosimetry (Environmental used to measure levels of X and gamma radiation in                                        Applications)" may be obtained from the American National Standards Institute, 1430 Broadway, New York, New York the environs of NRC-licensed nuclear facilities. This                                      10018.
Testing. and Procedural Spcificalion Fir Th,:rlnoluminesrencrt: Dou.imetry (Envirdnniciltal Applications)'" moly he (iblaind From the Americain Naliontal Standards Inslilttul.


guide provides minimum acceptable performance USNRC REGULATORY GUIDES                                            Comments should be sent to the Secretary of the Commission, US. Nuclear Regu latory Commission, Washington, D.C. 20555. Attention: Docketing and Service Regulatory Guides are issued to describe and make available to the public methods        Branch.
1430 Bro:dway, New York. New Yoirk t(X)IX.


acceptable to the NRC staff of implementing specific parts of the Commission's regulations, to delineate techniques used by the staff in evaluating specific problems  The guides are issued in the following ten broad divisions or postulated accidents, or to provide guidance to applicants. Regulatory Guides                                                      6. Products required.   1. Power Reactors are not substitutes for regulations, and compfiance with them is not                                                                  7. Transportation will be accept-  2. Research and Test Reactors Methods and solutions different from those set out in the guides                                                                      9. Antitrust Review the issuance or continuance  4. Environmental and Siting able if they provide a basis for the findings requisite to
USNRC REGULATORY GUIDES
                                                                                              5. Materials and Plant Protection          10. General of a permit or license by the Commission.
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'-


Comments and suggestions for improvements in these guides are encouraged at all          Requests for single copies of issued guides (which may be reproduced) or for place times, and guides will be revised, as appropriate, to accommodate comments and            ment on an automatic distribution list for single copies of future guides in specific to reflect new information or experience. This guide was revised as a result of         divisions should be made in writing to the US. Nuclear Regulatory Commission, Washington, D.C.    20555, Attention      Director. Oivision of Document Control substantive comments received from the public and additional staff review,
====t. of ine S ====
Se*tion Commission's regulations, to delineate techniques used by the sta


No specific criteria for good approximation are                      e. Section 7.2 of ANSI N545-1975 permits the re prescribed. However, the user should judge whether                    quirements of Section 4 of the standard to be satisfied the sample size is adequately large for the approxima                by reference to prior documents. Test results tion and whether the distribution of the measure                      provided by vendors are examples of such docu ments is sufficiently close to that assumed in the                   ments. Therefore, when requirements of Section 4 of analysis. Problems relating to underlying distribu                    the standard can be met by reference to test results tions can be avoided by the use of nonparametric                      provided by a vendor or other source, additional tests methods. Some of the specifications that are stated in                by a licensee are not needed.
====f. 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.


terms of standard deviations can be reformulated in nearly equivalent specifications for tolerance limits                   f. The appendixes to ANSI N545-1975 are not a for which simple nonparametric methods are                           part of the ANSI standard or of this regulatory guide, available. Such reformulations are also acceptable.                   which endorses the standard. However, the appen A. Hald2 and W. J. Conover3 are useful reference                     dixes do provide useful information on the topics sources for parametric and nonparametric methods,                    covered.
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 teqwu
 
====s. 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 is intended. ANSI N545. 1975 as well as the provi- sions and clarifications given below in the regulatory position are confined to simple statistical concepts and prescribe no specific statistical techniques. In fact. the implem-.-ntation of some specifications by rigorous statistical methods may prove difficult for some users of the guide. Therefore, good approx- imate statistical methods are acceptable.
 
No specific criteria for good approximation are prescribed. However. the user should judge whether the 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 the analysis. Pr(.blems relating to underlying distribu- tions can he 'tvoided by the use of nonparametric methods Some .-f the specifications which are stated in terms of standard deviations can be reformulated in nearly equivalent specifications for tolerance limits for %%hich simple nonparametric methods are available. Such reformulations are also acceptable.
 
A. [Iaid: and WV. J. Conover' are useful reference sources for parametric and nonparametric methods.


respectively.
respectively.
If every TLD i; individually calibrated, the popula- tion parameters for certain errors can be computed directly, and statistical inference is not needed for specifications relating to these errors.


==C. REGULATORY POSITION==
==C. REGULATORY POSITION==
If every TLD is individually calibrated, the popula tion parameters for certain errors can be computed                      The requirements and recommendations for per directly, and statistical inference is not needed for                formance specifications, testing procedures, calibra specifications relating to these errors.                              tion procedures, field procedures, and reporting procedures that are included in ANSI N545-1975 are generally acceptable to the NRC staff as the basis for Comments received on this guide and subsequent                    using thermoluminescence dosimetry for the discussions of these comments have indicated a need                    measurement of X and gamma radiation in the en for the following emphasis on, or clarification of, sec                virons of NRC-licensed facilities subject to the fol tions of the guide and ANSI N545-1975 in order to                      lowing additional provisions and qualifications.
The requirements and recommendations for per- formance specifications. testing procedures. calibra- tion procedures, field procedures, and reporting procedures that are included in ANSI N545-1975 are generally acceptable to the NRC staff as the basis for using thermoluminescence dosimetry for the measurement of X and gamma: radiation in the en- virons of NRC-licensed facilitir:.- subject to the fol- lowing additional provisiu.is
:J qualificati~ms.


avoid misinterpretations:
1. Section 3. -IPerforma..,e Specifications."  
                                                                          1. Section 3, "Performance Specifications," of a. In this guide, the expression environs of NRC                  ANSI N545-1975 should be supplemented by the fol licensedfacilities includes both the term environment                  lowing statement: "Subsection 4.2.4 shall apply also as defined in ANSI N545-1975 and the phrase un                        to the subsections 3.1 and 3.3."
of ANSI N 545-1975 should bt' cupplemented by the fol- lowing statement: "Each pt rformance specification shall be verified at the 95% confidence level."
restricted areas as defined in 10 CFR Part 20.
A. [laid. Stati.;tical "lhior'v 'ith Eiginierint ..lpplicatimts. John k\\\\ e% & sons. Inc.. 1t52.


2. Instead of Section 3.1 of ANSI N545-1975, the b. In Section 2, "Definitions," of ANSI N545                        following should be used: "The performance of the
'\\%. J. (d'ono.er. Iracci .\\'operait,'tri .ttijis.
1975, the distinction between thermoluminescence                      TLD system shall be determined under laboratory dosimeter (TLD) and thermoluminescence (TL)                            conditions and in a known radiation field with an ex phosphor should be noted. As defined in ANSI N545                      posure equal to that resulting from an exposure rate
1975, a TLD can, and usually does, contain multiple                    of 101MR/hr during the field cycle. Ninety-five per TL phosphors or. otherwise provides for multiple                      cent of the measurements shall fall within 10% of the readings of the exposure. When multiple readings are                  known exposure."
used for the measurement of the response of a TLD,
that response is an average of the individual readings.                   3. Instead of Section 3.3 of ANSI N545-1975, the ANSI N545-1975 refers to these average values rather                  following should be used: "Ninety-five percent of the than to the individual readings.                                      final values (after all appropriate corrections to the measurements are applied, including those for errors c. Regulatory position 3 of this guide and Section                  expected under field conditions) shall differ from the
3.3 of ANSI N545-1975 refer to the overall error in                  correct value by less than 30% of the correct value."
the total field exposure. No method is specified for interpreting field exposures to isolate contributions                    4. Instead of Section 4.3.1 of ANSI N545-1975, attributable to a nuclear facility, and no limit is                  the following should be used: "Uniformity shall be specified on the error associated with estimates of the                determined by giving TLDs from the same batch an exposure attributable to the facility.                                exposure equal to that resulting from an exposure rate of lOtR/hr during the field cycle. The response d. Section 6.3.1 of ANSI N545-1975 specifies field                  obtained shall have a relative standard deviation exposure at a height of 1 meter above the ground;                    (coefficient of variation) of less than 7.5%."
however, Section 6.3.3 permits exposure at other heights.


5. Instead of Section 4.3.2 of ANSI N545-1975,
John Wiley &
2A. Hald, Statistical Theory with Engineering Applications, John     the following should be used: "Reproducibility shall Wiley & Sons, Inc., 1952.                                            be determined by giving one TLD repeated exposures
sn.qo, Inc.. I19T1.
3W.J. Conover, PracticalNonparametric Statistics, John Wiley &        equal to that resulting from an exposure rate of 10
Sons, Inc., 1971.                                                   juR/hr during the field cycle. The responses shall have
                                                                4.13-2


a relative standard deviation (coefficient of variation)        This guide reflects current NRC staff practice.
2. Instead of Section 3.1 of ANSI N545-1975, the following should be used: "The performance of the TLD system shall be determined under laboratory conditions and in a known radiation field with an ex- posure equal to that resulting from an exposure rate of 10 p R/hr during the field cycle. Ninety-five per- cent of the measurements shall fall within 10% of the known exposure."
3. Instead of Section 3.3 of ANSI N545-1975, the following should be used: "Ninety-five percent of the final value-:- (after all appropriate corrections to the measurements are applied, including those for errors expect.d under field conditions) shall differ from the correct value by less than 30% of the correct value."
4. Instead of Section 4.3.1 of ANSI N545-1975.


I
the folLwing should be used: "Uniformity shall be determined by giving TLDs from the same batch an exposure equal to that resulting from an exposure rate of 10 a R/hr during the field cycle. The response obtained shall have a relative standard deviation (coefficient of variation) of less than 7.5%."
of less than 3.0%."                                           Therefore, except in those cases in which the appli cant or licensee proposes an acceptable alternative method, the staff is using and will continue to use the method described herein in evaluating an applicant's
5. Instead of Section 4.3.2 of ANSI N545-1975, the following should be used: "Reproducibility shall be determined by givinL- one TLD repeated exposures equal to that resulting from an exposure rate of 10
p R/hr during the field cycle. The responses shall have a relative standard deviation (coefficient of variation) of less than 3.0%."-


==D. IMPLEMENTATION==
==D. IMPLEMENTATION==
or licensee's capability for and performance in com plying with specified portions of the Commission's The purpose of this section is to provide informa          regulations until this guide is revised as a result of tion to applicants and licensees regarding the NRC            suggestions from the public or additional staff staff's plans for using this regulatory guide.               review.
The purpose of this section is to provide inrorma- tion to applicants and licensees regarding the staffs plans 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 used in the evaluation of operating license applications docketed after July 15, 1977.


4.13-3
If an applicant wishes to use this regulatory guide in developing submittals for applications docketed on or before July 15. 1977, the pertinent portions of the application will be evaluated on the basis of this guide.


UNITED STATES
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Revision as of 00:18, 11 January 2025

Performance, Testing, and Procedural Specifications for Thermoluminescence Dosimetry: Environmental Applications
ML13350A201
Person / Time
Issue date: 11/30/1976
From:
Office of Nuclear Regulatory Research
To:
References
RG-4.013
Download: ML13350A201 (2)
v • d • e


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

Section 20.105, "Permissible levels of radiation in unrestricted areas." of 10 CFR Part 20. "Standards for Protection Against Radiation." provides limits on levels of radiation in unrestricted areas resulting from possession, use. or transfer or NRC-licensed radioac- tive material. Section 20.106, "Radioactivity in ef- fluents to unrestricted areas," of 10 CFR Part 20

prohibits a licensee from releasing to an unrestricted area radioactive materials in concentrations that ex- ceed limits specified in 10 CFR Part 20 except as otherwise authorized in a license issued by the Com- mission. Section 20.201. "Surveys." of 10 CFR Part result of normal operations. including anticipated operational occurrences, and .s 'the result of postulated accidents.

"hernioluninescence dcs!m'§krp (TlD) is widely used to measure levels o

~fý4X`d-gnnia radiation in the environs of NRC41icenkd nui61iear facilities. This guide provides miniimuni acceptable performance criteria for TLD.sysirns used for this purpose. It also provides 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 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, General i *iW

ion

64,

"Monitoring radioactivit e

es, of' Appendix A, "General Design Crite or Nuclear Power Plants," to 10 CFR Part 50

uires that nuclear power plant designs provide means for monitoring the plant en- virons for radioactivity that may be released as the The specification of performance criteria of ther- moluminescence dosimetry and the verification of the actual 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. 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 sta

f. 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 teqwu

s. 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 is intended. ANSI N545. 1975 as well as the provi- sions and clarifications given below in the regulatory position are confined to simple statistical concepts and prescribe no specific statistical techniques. In fact. the implem-.-ntation of some specifications by rigorous statistical methods may prove difficult for some users of the guide. Therefore, good approx- imate statistical methods are acceptable.

No specific criteria for good approximation are prescribed. However. the user should judge whether the 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 the analysis. Pr(.blems relating to underlying distribu- tions can he 'tvoided by the use of nonparametric methods Some .-f the specifications which are stated in terms of standard deviations can be reformulated in nearly equivalent specifications for tolerance limits for %%hich simple nonparametric methods are available. 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 computed directly, and statistical inference is not needed for specifications relating to these errors.

C. REGULATORY POSITION

The requirements and recommendations for per- formance specifications. testing procedures. calibra- tion procedures, field procedures, and reporting procedures that are included in ANSI N545-1975 are generally acceptable to the NRC staff as the basis for using thermoluminescence dosimetry for the measurement 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."

of ANSI 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. John k\\\\ 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, the following should be used: "The performance of the TLD system shall be determined under laboratory conditions and in a known radiation field with an ex- posure equal to that resulting from an exposure rate of 10 p R/hr during the field cycle. Ninety-five per- cent of the measurements shall fall within 10% of the known exposure."

3. Instead of Section 3.3 of ANSI N545-1975, the following should be used: "Ninety-five percent of the final value-:- (after all appropriate corrections to the measurements are applied, including those for errors expect.d under field conditions) shall differ from the correct 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 be determined by giving TLDs from the same batch an exposure equal to that resulting from an exposure rate of 10 a R/hr during the field cycle. The response obtained 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 shall be determined by givinL- one TLD repeated exposures equal to that resulting from an exposure rate of 10

p R/hr during the field cycle. The responses shall have a relative standard deviation (coefficient of variation) of less than 3.0%."-

D. IMPLEMENTATION

The purpose of this section is to provide inrorma- tion to applicants and licensees regarding the staffs plans 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 used in the evaluation of operating license applications docketed after July 15, 1977.

If an applicant wishes to use this regulatory guide in developing submittals for applications docketed on or before July 15. 1977, the pertinent portions of the application will be evaluated on the basis of this guide.

4.13-2


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