ML20027E232
| ML20027E232 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 10/23/1982 |
| From: | Rogers W GEORGIA POWER CO. |
| To: | |
| Shared Package | |
| ML20027E220 | List: |
| References | |
| PROC-821023-01, NUDOCS 8211120285 | |
| Download: ML20027E232 (37) | |
Text
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PROCEDURE
.- Personnel Do=;imetry Prnoram N
PROCEDURE TITLE - HNP_soo4 i PROCEDURE NUMBER. , Lab RESPONSIBLE SECTION - SAFETY RELATED ( .I ) NON-SAFETY RELATED ( ) e . EIEP r g APPROVED APPROVED
- t REV. DESCRIPTION DEPT. PLANT DATE
- - HEAD MAN ER
,j. 13 Pages 8,11,12, & 19
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The 'evision of this crocedure does not constitute an unrevieaed _ safety I question as explained below. . 1 e 1___ T_he_gr.gb. abil_i_tv of_.gcg.u_rr3nc.eJnd r thg_g.qn.Seoucnces of an ' accident ___ or malfunction of equioment imcortant to safety are not increased above _thoSg_a.nalv. Leg in__.the_E533hu_e_12_tbas.e._f. ban 2AS_henuse . the revision does_not chance __the ourcose or oerformance of__the r system. e . l.
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is not reduced due to this_ revision because the revision does not chance any limited safety system settinos which would allow a safet*Ljmit l to _b_e exceeded or to allow a limitino condition _fo_r operations __to be exceeded as stated in' Technical Soecifications_. _
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.J'N ;. See Title Page Georgia Power A . 1 of 22 PERSONNEL DOGIMETRY PROCRAM A. PURPOSE ' . To describe a procedure for the issuahce and dse'of personnel dosimetry equipment for plant personnel, visitors, and .- construction workers while within the operating buildings. B. REFERENCES a' Code of Federal Regulations, 10CFR2O A.P.T. Computer Exposure Records System
. C'. DESCRIPTION OF DOSIMETRY EGUIPMENT -
t 1. Thermoluminescent Dosimeter (TLD Badge)
., The TLD Badge is a small badge cohtaining two or mare
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lithium fluoride TLD chips for measuring external beta gamma
<* {, l. radi'ation. These badges are supplied by a TLD badge vendor 7 -s 7 and will be processsed at monthly intervals during normal
;j '{ operations, and at more frequent intervals during
*. maintenance outages or when conditions require. The TLD
- b,, y badge vendor will read and evaluat n he badges and report the results to the Health Physics / Laboratory Foreman. The record of accumulated external radiation exposure received l
. by individuals is obtained principally from the interpretation of the TLD badge.
' i:!. Direct reading pocket dosimeter j ,
The direct reading pocket dosimeter is a pencil shaped ion chamber used primarily to provide day-by-day indication of external gamma radiation exposure. A dosimeter with a range of O-200 MR is provided for normal use. For special requirements higher range dosimeters will be issued as j necessary by the Health Physics staff.
- 3. Neutron Dosimetry *
*3 The Health Physics staff will review the R.W.P.'s each dosimetry period for personnel who may.have become exposed to neutron radiation. The TLD badges for these individuals will be mailed to the TLD badge vendor requesting that the badges be read both for beta gamma exposure and neutron exposure. The report for these badges will be handled the same as in paragraph c .1. -
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- 4. Other
'" As deemed appropriate the Health Physics staff will issue other personnel monitoring devices, i.e. finger rings, TLD
. bracelets, chirpers, etc. for monitoring , personnel radiation exposure. -
D. ISSUANCE OF TLD BADGES AND l'OCKET DOSIMETERS 1.- Prior to issuance on any TLD badge or dosimeter Form 1, TLD BADGE AND DOSIMETER ISSUE must be completed. See Section C. for details.
- 2. Tssuance of any TLD badge may be made only by a member of
,. the Health Physics staff. .
- 3. Issuance of pocket dosimeters may be made only by a member of the Health Physics staff.
- 4. Prior to entering the operating buildings where radiation
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.. exists all individuals assigned TLD badges and dosimeters
- I; , e will pick them up and wear the devices as in Section E.
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. .; Daily dosimeter reading will be logged as in Section G. - -i ,1 ._,. J 2.,./ NOTE l
Dosimeters that have been used, and then placed in the "OUT" l rack, will be re-zeroed prior l to the start of th'e next work
. day, if a reading of 40 mrem, j or greater, has been reached.
E. WEARING AND USE OF TLD BADCE AND DOSIMETER The TLD Badge and dosimeter are to be worn adjacent to each other between the waist and neck on the front part of the body. As per Health Physics discretion, an individual may bd instructed to l Hear the dosimeter and TLD on another part of the body, if it is determined the dose rate at that part of the body is likely tn be l higher than that between waist and neck. When wearing protective l clothing, the TLD badge and dosimeter are clipped inside the breast pocket (Outside pocket) of the coveralls and pocket closed. The TLD badge shall always be worn with the face of the badge facing out.. Each individual should examine his dosimeter periodically while in a radiation controlled area. No individual l l should allow the dosimeter reading to exceed 150 mR or 75% of l full scale regardless of any prescribed exposure allowance,
, , without having his dosimeter recharged and reading recorded.
- Personnel finding self reading dosimeters off-scale shall immediately leave a Radiation Control Area unless involved in
- controlling an emergency and shall notify the He fJ sics
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See Title Pace 3 of 22 Staff. The loss of any personnel monitoring device requires the immediate notification to the Health Physics staff.
. e- ,. PJOTE i If at anytime the dosimeter is - -
dropped or erratic readings are . noted by the user, the Health Physics Staff should be notified iniorder that another dosimeter .-
, can be issued if deemed necessary.
F. WEARINC AND USE OF EXTREMITY DOSIMETRY The following criteria should be used for the use of extremity *
,- dosimetry:
- 1. Extremity dosimetry is defined as finger rings, or as per H.
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P. discretion, TLDs taped to one of the extremities. The extremities of.the body are hands, forearms, feet, and
,,I ankles.
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- 2. Health Physics shall. determine the need for extremity
.-;. g monitoring on an individual job basis. Factors involved in
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. making this determination are dose rates, stay times, etc.
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Extremity dosimeters will be provi.da.d for those individuals requiring this coverage. -
- 3. Guidelines for using extremity dosimetry are as follows:
- a. When the extremity exposure rate is likely to be four times the whole body exposure rate AND the extremity exposure rate is likely to be > 400 mrem /hr.
l
- b. .
When performing primary systems sampling, manipulating high-intensity calibration sources, or performing any task for which extremity dosimeters are-required by H.P.
- 4. Extremity dosimetry will be issued and returned on a daily basis, unless specified differently by H.P. If personnel need extremity dosimetry more than once a month, they will be issued the.same extremity dosimeter.(Finge'r ring, etc.)
for the duration of the morath. Form 5, Extremity Badge Issue Log will be completed as needed., G. ESTIMATING NEUTRON EXPOSURE
- 1. Until an individual's TLD is read and the actual neutron -
exposure determined, an estimate will be generated in the i following manner: Form 11, NEUTRON DOSE ESTIMATES will be used to record neutron dose. .
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.a. As per survey data, calculate a neutron-to gamma ratio by dividing the neutron dose rate by the gamma dose rate.
, b. Multiply the eutron-to gamma ratio ti$ies the gamma
, , dose recorded by the pocket dosimeter. ,
c. Add this product to the gansna dose to obtain the total
, , whole body exposure.
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- d. Example of above method:
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(1) Camma dose rate: 60 mR/hr
, . . Neutron dose rate: 30 mR/hr
- Dosimeter reading: 80 mR . -1 3
(2) Neutron-to gamma ratio:
- f. 30/60 = 0.5
; (3) Estimated neutron dose: (80 mR)(0.5) = 40 mR
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1 '. ; * - k4) Total whole body dose: t.
, , , 80 mR + 40 mR = 120 mR
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- e. Input the total whole body dose to.the computer via
. 2 {' - DDUDAT Program or use Form 2 of this procedure if the computer is disabled.
n J .'J 1-H. RADIATION PROTECTION ORIENTATION ~ All new employees shall receive a radiation protection orientation prior to their assignment of work in Radiation
, Control Areas or have an escort by someone who has demonstrated understanding of radiation protection practices and procedures.
See HNP-8018. The orientation will cover all portinent radiation protection practices and procedures to a degree sufficient to allow an employee to perform his assignment without incurring unnecessary radiation exposure or contamination. Each employee will be required to demonstrate an understanding of these procedures prior to being allowed to enter a Radiation Control Area unescorted. I. PERSONNEL DOSIMETRY RECORDS e
- 1. Form 1, TLD Badge and Dosimeter. Issue a.
The preparation of this form is the responsibility of ' the Health Physics Department. The purpose of the form is to record all information required by 10CFR2O for .,- l personnel wearing monitoring devices.
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; b. Procedure for recording information on Form 1. ~
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(1) The individual shall complete the upper part of
, the form down to the heavy, black line.
(2) Health Physics Department shall complete the bottom.part of the form. ' (3) The form shall be filed and maintained in the .- dosimetry office until termination.
- 2. , Form 2, Weekly Pocket Dosimeter Record e
- a. This form provides a means for recording personnel pocket dosimeter results daily and will assist in
, , evaluating each person's integrated dose to keep exposures as low as reasonably achievable and belcw ~
, exposure limits of 10CFR20.
t The form will be used if the computer exposure record .
. system described in I.9 becomes disabled and when
. visitors are issued dosimeters and TLD's.
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- 7 ,i -b. Procedure for recording information of Form 2
~~~ - * ? -
ygb { ' (1) Form 2'for the current week will be maintained by the Health Physics Staff.
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r (2) Separate sheets of Form 2 will be kept for each type of personnel. (3) The individual whose name appears on Form 2 will record or have recorded his dosimeter reading on entering the operating buildings (IN BLOCK) and on ( exiting the operating buildings (OUT BLOCK) at the end o~f the work day. It will then be calculate or
. have calculated the indicated exposure by determining the difference between the IN and OUT blocks and will log the result in the NET block.
(4) The Health Physics staff wi11 log each individual's accumulated quartenly exposure in the GTR block at the beginning of each deck. (5) The Health Physics staff will determine total daily exposure by adjusting the indicated exposure with exposures determined from Form 3, Dosimeter - 1 Re-zero Record and other methods as necessary. 1 These adjustments will be logged in the ADJ. block l and will be added to the NET exposure to determine ,
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. -the total exposure for the day and recorded in the TOT block. .
(6) The Health. Physics staff will determine the accumulated weekly exposure for each individual by 4 sunming the TDT block for the day and the WK block i for the previous day. . (7) The Health Physics staff will adjust the quarterly . (GTR) exposures to reflect official exposures as . l
. . dete6 mined from the processing of TLD badges during the current quarter.
- 3. Form 3,' Dosimeter Re-Zere Record
, This form is used when an individual's pocket dosimeter is re-zeroed while within the operating buildings. DOUDAT l t cards may be used in lieu of Form 3. The form will be !
located at each dosimeter charger station. It shall also be !
', used when zeroing special pocket dosimeters as issued by the i**
- Health Physics staff (Indicate special in the Remark j'*j '.C Column). Exposure data from Form 3 shall be entered on Form
-- y 17 2 or in the computer record system from each individual. -
fjb J See I.2 or I.9 of this procedure.
.4
- 4. Current TLD Dccupational Radiation E;.x.posure Report
- a. This report will be furnished sy the TLD vendor at a frequency based on badge exchange intervals. The l report is approved for use in lieu o~ NRC Form 5.
- b. Results of TLD exposure analysis will be entered into the computer exposure record system on a monthly basis or with greater frequency, as this data is provided by the vendor. Current NRC Form 5 information may be -
obtained from the computer system at any time on an individual or departmental basis by using the INDORP or the DOLIST program respectively. . I
- 5. Form 4 Replacement Exposure for Lost or Damaged TLD Badge This form will be completed as necessary to esIimate personnel exposure during a period when a TLD badge has been lost or damaged. Exposure determined on this form will be entered on the Current TLD Dccupational Radiation Exposure .
Report through the use of a letter to the TLD vendor as shown in Form 8 and into the computer exposure record system.
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- 6. Fodm 5, Extremity Badge Issue Log ;
' "' ' Form 5 will be filled out as needed and completed by the end of each month. The extremity dosimeters will be mailed to
- the vendor at the end of the month for ana,1ysis, and the -
results are supplied by the vendor on the Current TLD *
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Occupational Radiation Exposure Report. I
- 7. Form 6, Request for Employee's Previous Radiation Exposure A letter shall be written to an employee's previous }
employer (s) if the employee does not have his previous exposure record and indicates that he may have received o'ccupational radiation exposure while employed there. The
- letter shall be provided on Georgio Power Company stationary ,
and in the general format as shown on Form 6, Request for
! Previous Radiation Exposure.
', 8. Form 7, Report to Former Employees and Visitors of Exposure to Radiation.
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-- -f t.7 On request by former employees a report showing exposure to
, a3 { radiation shall be furnished within 30 days from the time
.' t the request is made, or within 30 days after exposure of the
-a #
3,# individual has been determined, whichever is later. The report shall cover each calendar qu5rter of the individual's time within the Protected Area involving exposure to radiation or such losser period as may be requested. The report (Form 7) shall be xeroxed from individual's file and shall be transmitted with a ' cover letter (form 9) on Georgia Power stationary and in the general format as shown on Employee and Visitor Radiation Exposure Report, Form 9. When an individual terminates employment or an individual assigned to work in Radiation Control Areas at the Hatch Nuclear Plant, but not employed by Georgia Power, completes his work assignment the individual and the Nuclear Regulatory Commission will receive a repor't on his exposure to radiation and radioactive material incurred during the period of employment or* work assignment. Such report sholl be funished within 30 days after the exposure.of the individual has been determined or 90 days after the date of termination of employment of work assignment, whi chever it-earlier. The report shall be provided on Georgia Power stationary and in the general format as shown on Form 7, - l Employee and Visitor Radiation Exposure Report. The original report may be obtained by accessing the computer , exposure record system using the TERMN8 program, or from the
. \ Current TLD Occupational Radiation Exposure Report (pa'ra.
I.4). '
..t i Referenge On'y -
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- T* oA a ocu e o
' HNP- 8004
,* ;,0c0 Title Pago ,
aa===,W
.4 14
'.... Georgia Power n ..
See Title Page 8 of 22
- 9. Comp'uterized Personnel Exposure Records
< a. A computer for up-dating personnel exposure data on a 1 day to day basi's has been developed. Pocket dosimeters
. are read by a Health Physics technician and the reading entered in the computer. The computer updates the
- individual's exposure record to reflect the latest ..
dosimeters reading. Daily, weekly, monthly, quarterly, t yearly and life time exposure information is made g
- available to the Health Physic staff, plant supervision, and the individual through the use of .I various computer printout formats. See APT Automated [
Personnel Dosimetry Records System Manual.
- b. Schedule of input and output of exposure information via the computer exposure records system. *j
, (1) Daily - Pocket dosimeter will be read on a daily basis. ,
.. 1 . .
-d e * . .
Entries will be recorded by the computer __l f,,j,' on a daily basis using the DOUDAT . program. Where dosimeters are re-zeroed "i y in the Primary Protected Area, the dose el , ad '/ recorded on Form 3 shall also be entered P into the computef using the DOUDAT program. (2) Weekly - A listing of daily exposures for all personnel'on site for each day of the
- week will be obtained at the end of each week using the DOPRNT program.
(3) Monthly - The not dose indicated for each worker listed in the " Time Record" section of all Radiation Work Permits issue during a givea month shall be entered into the comr ter exposure record system prior to or by of the TLD data for the respective jeriod, using the CWPUOT program. TLD data will be entered into.the computer exposure record system each month usin:) the CLDUDT program as this information is provided by the vendor. Corrective or supplemental TLD data may be entered - into the computer exposure record system using the HLDUOT program. - -
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. NOTE
~
Programming"has been established
.- .' to determine the discrepancy between the TLD and pocket
' ~
dosimeter. A discrepancy greater than 257. for exposures over 100 mR will be evaluated. An investigation shall be conducted
- and documented on Form 10,'Dese -
. . Discrepancy Investigation. The TLD reading will be retained as the
. record exposure unless the investigation justifies use of
.. pocket dosimeter totals. -
Data files will be removed from the
! TMPDOS exposure record file each month
. for personnel terminating their stay at the plant whose final TLD data has been provided by the vendor. The TERMNS
. ~i *4 program will be used to accomplish this and will produce the original letter of
_-m}, 39 f.7 notification of exposure for the
'{ < individual, as well as a copy of his 3/ final dosimetr.p lile contents.
(4) Annual - The NRCRPT program will be run after the TLD results for each year has been entered into the computer. A l compilation of information to satisfy l 10CFR2O annual reporting requirements will be provided by the program after the exposure information for an entire
. year has been recorded.
l (5)As required The PDFMAK program is utilized to enter i new personnel information into the l computer exposure records, to add identification or prior exposure information. , The OELETE program is used to transfer a i personnel record from the active f i l e t-i to the TMPOOS file at the end of his - stay. The record is retained in this file pending receipt of final TLD dat.t from the vendor. , a ,; Refenntegy (C:L 1
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i.,- -Ece Title Page 14
.. Georgia Power n .
10 of 22 See Title Patie . , The HLDUOT program allows the entry of , 1LD information for individuals at times other than the regular monthly entry of TLD data on a plant basis.
- The individual dose re'po'rts covering all .- l MC' Form S information can be obtained using the INDORP program.
The DDLIST program can be,used to i provide on a plant basis the same information that the INDORP program supplies for a particular individual. '. e . Nf$enever required, particularly during , an outage, the DDPRNT program may be utilized to obtain a listing of dose for
?
each day of the current week and the margin between the cummulative exposure and the most restrict'ive exposure limit,
,g ;/, ,
- - . for each person on site.
The' Applied Physical Technology
---ie'{* 7 .
Automated Personnel Dosimetry System _2p { Instruction Manual may be referenced for
'"' .'# information on organization of data
*~
' files and operafTon of programs.
- 10. Form 9, Reply to Request for Previous Radiation Exposure When a request is received by Georgia Power Company from a previous employee or visitor for the purpose of providing his new employer (or facility being visited while in the employment of his new employer)received with a record at Plantof Hatch, l
occupational radiation exposure l Form 9, Reply to Request for Previous Radiation Exposure, shall be used to supply this information. J. MANAGEMENT REVIEW OF RADI ATION EXPOSURE DATA The H.P. Superintendent will be responsible for preparing a for the management meeting. As a Radiation minimum, Exposure the report will Reportconsist of a tabulation of exposures by received per worl<er and department, including the average dose the maximum dose. Also to be included will be a tabulation if of - exposures on specific maintenance workOther during the month, exposure significant significant worl< has been performed. information will be discussed during the meeting as appropriate. g_ . , . . . Ref rence Only lf x .. j maHUal Set-
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- t:. I. Hatch Nucl0ar Plant aaociovaa w ~
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Georola O Power d e..i
. See Title Page 11 of 22 Bi-Weel<1y (every two weel<s) updates of personnel exposure are provided to each department. These records provide supervie, ors ]
as well as worl< ors information on radiation exposure accumulation and will aid in minimizing exposure to individuals by more efficient worl<er utilization.
- In case of some problem, such as a computer malfunction, when the '
Bi-weekly update listing cannot be made then H.P. supervision will be informed. As soon as the problem is resolved the computer listing Will be updated and the dictribution to the , different, departments will be resumed. ,
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. , .... Georgia Popcr n .... O See Title Pane 12 of 22 FORM 1 TLD RADCE AND DOSIMETER ISSUE, _
s.'" , S . . . . i Ti O cess;.e.n c.mittle_1;u
.O. s w.E No. e
, OATE: 19 I I NMC IN FLA.L (PRINT) .
FIRST M! DOLE L.Mif 1 SOC 1M. SECLMITY NO. - - E!RTH OATE! posTH OAv YEe# 4 . I e ooacss:
= == < >
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. CITY STATE ZIP
. JOB CATECORY INTRA. PLANT CCPT. CEPPM4Y
,3 . SFERVISOR & ENCitCERINC ( ) CA. PtJ4 CO. Pt./WT >MTCH ( )
' CFFICE STM F ( ) MAINT. WCH. ( ) CA. Pl%CR COM8ANY ( l
*~* -a DC. STAFF ( ) MAINT. G.CCT.( ) SOUTHERN EJtVICES INC. ( )
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CFEMATIONG ( ) TEGT CEPT. ( ) A.O.A. * ( )
-g I .]' t AD/>P ( ) CPCEATICNG ( ) T&8 ( )
"iAINTENANCE ( ) LA3ORATCRY ( ) C8&1 4 3
; 3,. e OTtCR ( ) OFFICE ( )
- OTFER ( )
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- PLEACF. CESCRIBE!
- CONTRACTDI ( )
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.g e 6tawa you e.orteed at or wa ss ted .a Nucleme Fact 1 sty other than Hatth an the last three months?
- YES ( ) NO ( )
*
- If VES, est.at f ac!! & ty SICNATLEE Have you been at Plant Natch an the last three months? YESt ) NOC 1 If visitor, escort's name TLD Badge No. MC Form 4 completed Authorised ouarterly Esposure udte=*
Issued By Reviewed By E
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If 18 years old limat esposure to 75o adem/tuarter.
- If current qu.orter esposure a s unhane. I sain t as 300 mFem.
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, ,y 'S'o e Title Pag?
, oo C. Georgia Power a- ..o.
24 _See Title Paae* 13 of 22 FORM 2
. ,. WEEKLY POCKET DOSIMETER RECORD
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See Tiile Page 14 of 22 . s FORM 3 DOSIMETER RE-ZERO RECORD- {
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14
... Georg. ia Power n .
See Title Paqri 15 of 22 t
. . FORM 4 REPLACEMENT EXPOSURE FOR LOST TLD BADCE s *
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u.me: 11.D No.: Sec. Sec. No.: e 11.D Sadge Was: 1.ast ( ). Damaged ( ) *Other ( 3
- If *Other* Esplatn - ,
4 First Day of Current T1D Period: TI D Last Worn:
$ 00m e DESM NT
' Old Individual enter a radiatson area today? Yes ( ) No ( J
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- If *No* complete items 1, 2 and 9; 15 'Yes' complete all items.
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. -1. Sean of Dosi. meter readings recorded during period:
i.] 2. Source of above Dose Data: tee-8004, Fors 2: [.[< IX3PRNT: 00LDAT: CD'PUTER h t Radiation areas did the individual enter today? a 4' / 4 3.
's
- 4. Home long e as the individual in each area?
. L What were the Oose Rates in these areas?
b What RvP No. was the individual working under?
- 7. What esposures were received by others in the area?
Name: Dese: Time in area: . Mome Dose: Time in area:
- 3. Sased on the above informatson. what is the individual'snd.
estim.sted reposure for today? l Esnployee H.P. Represen3atswe 4
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14 16 of 22
- See Title Paqo- .
FORM S t
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EXTREMITY BADGE ISSUE LOG.
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". REGUEST FOR PREVIOUS RADIATION EXPOSURE s* , ,
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See Title Page 18 of 22 , FORM 7 4 [
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SUBJECT:
BADIATTON EXFO5URE REFORT
. M AR $113 e
PLEAst BE ADY15tB THAT WHILE EMF 1.DTED CR VISITING AT THE EIVIN T. IL4TCM NUC1.ZAR p I FLA:ff DURI%C ThE F0LLOWI:iC WORK FER10D($1. TGU RZOEIVED TME FOLLuleDiG E205URE TO 10E1:15C RADIATION. .
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4 l 310-AS$AT RESLLT3: I g I TitlS EPORT !$ ftR:815MES TO YOU t*aDER TOG 5tt00L3 THE TMIS FRESE&nT PROVISIONS OF TI:E Nt1*:.ZAR RZCL*LATORY t RIPURT FOR FU2THER e C0'ttt$$t03 RECUI.ATION 10 CFR FART 19. I mEF RzsCs. 8 f l , R.ADOmATCRT aurtKVI:nJA . 9 3C3 DIRECTOR. PtsMACFtENT AND FROCRAM ANALT585 U.S. ::tTL'.AR RECL".AT8)RY CO*?tt3310N WASM!3CTO:t. D.C. 20555 4 na Sh;F.4004 Al4 -
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19 of 22 See Title Page - FORM 8 i
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E. f. Baten TLD occupational The Georgia Power Company Plant eroosure J, m /. 8 Radiatten Exposure Report does (or will) not reflect s? I Pesolved by the following person for the indtestedeemsted because of ) ' lost or damaged TLD hadge. Based en plant espesure records, we estimate the ladividual's a
- ' I- espesure to to EST.EZPOSURE' i' 13.3. 30. I SATES COTERED fREM)
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. Please adjust 4%1s individual's record to re flee t the above
? settanted espesure.
g Toers truly. .
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arfacutD ts A COFT OF THE EIF05URE REFORT FURNISHED (WA74)
-- 88** *>-
a-(58AB) 0F05 TERft1 NATION OF T15tTyMF14TMENT AT PtairT RATCH. At.L EIFOSURE !$ DETERMIltED BY TLD SADCE L1rLESS OTHERWISE NOTED ON ATTACRED. TE18 REFott IS FURN15 RED TO TOU CNDER THE F10VI$10NS OF 13 CTR 19.33. a
; '^=^=H 0mY fonLMAh as File
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FORM 10 DOSE DISCREPANCY INVESTICATION .
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Espesure entered into computer ty:
, P6mme/De t e Eber1&ne notified via Forn 8 Name/Date
;
- Investigation may include the folloeeing:
- a. Survey Restatts
- b. Esposure Time C. Deses of other perf orusng samilar esork.
l
- d. Locatson ef dewstem worn en the body. ]
- e. Type of Dossmeter. Hagte Range or Loes Range.,,
- f. R%d* tot.als.
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-. PROCEDURE TITLE
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Lab RESPONSIBLE SECTION. i i. NON-SAFETY RELATED ( ) c - SAFETY RELATED ( X) I L. APPROVED APPROVED
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POCKET OOSIMETER OPERATION AND CALIGRATION A. PURPOSE ,,
. To ensure that the instrument is leak. tested and calibrated properly and to provide operation guides for the. user. ,,
B. SAFETY
- i Observe radiation protection procedures.
C. REFERENCE ANSI N13.5-1972 .
,- ' O. TEST EGUIPMENT .
- 1. Dosimeter Calibration Board
,f 2. Camma Source e * . . .
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- 3. Dosimeter Charger -
N sf 4. Timer
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4 E. DESCRIPTION OF INSTRUMENT l l The pocket dosimeter is a pencil shaped ionization chamber that l measures gamma radiation and give,s an instant read-out in-milliroentgens or roentgens. The dosimeter is. basically a l - capacitor with a single movable electrode. The capacitor is charged to a predetermined voltage which results in a given separation of the two electrodes. When exposed to X or gamma radiation, or both, ionization occurs in the chamber surrounding the elect'rodes and causes a decrease in the charge on the electrodes. This results in a change of position or deflection of the movable electrode. The magnitude of the deflection is a
- function of the radiation exposure and is observable through a l self-contained optical system.
F. OPERATION OF INSTRUMENT ,
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NOTE .- Handle. dosimeters with care. These instruments are . l delicate and relatively expensive. , 1 .
- l. -- 1. Check that the dosimeter is not, visibly damaged.
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- 2. Clean optical eyepiece of dosimeter with lens tissue paper as often as required.
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.s* .- NOTE =
t I Dosimeters will be routinely checked for radioactive contamination by the Health Physics staff. However, if ' the user suspects contamination of his dosimeter, he should notify the Health Physics Staff immediately. A i contaminated dosimeter should not be used.
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- 3. Zeroing of dosimeter !
a, Place dosimeter over charge connector on dosimeter i charger and depress dosimeter. g Look in dosimeter eyepiece and adjust hairline to zero
- b. i using the knob on the charger. :i
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- c. Remove dosimeter and check its zero by reading the
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scale with the dosimeter in a horizontal or slightly . l
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'above horizontal position. I
-- u{'.7 NOTE
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, n .> ' J It is not absolutely esse d al that the dosimeter l i-read exactly zero, since the initial reading will be logged and subtracted from any final reading. The hairline must not be less than.zero, however, and shuuld be within 5% of the fullscale reading (0-10 mR for 200 mR dosimeters). NOTE The initial (zero) reading and final reading ofin the dosimeter must be made with theposition, geometrical dosimeter i.e., l approximately the same read horizontally or slightly above horizontal.
- 4. Reading of dosimeter for dose.
Read the dosimeter as in step 3.c. .,, NOTE , If the reading is 75% of the fullscale deflection or greater the dose must be logged and the dosimeter ~ re-zerced. Notify the Health Physics Staff.
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3 of 9 NOTE If at anytime the dosimeter is dropped or erratic
,- readings ~are noted by the user, the Health Physics staff should be notified in order that another
, dosimeter may be issued if deemed necessary.
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G. EXPOGURE OF INSTRUMENT .
- 1. Charge-leakage test ,,
- a. ~ Adjust the hairline on the dosimeter using the dosimeter charger for a value between "O" and 1/4 fullscale. Record value, date and time and dosimeter
. serial number on Data Package 1 (Data Sheet 1).
- b. Store dosimeter in a radiation free area (less than
, 0.02 mR/hr) for a period of about 24 hours.
- c. Read the dosimeter at end of storage period.
- d. Enter the. reading, date and time of reading on Data
- Package 1 (Data Sheet 1).
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U' if e. Determine ra te of charge-leakage per 24 hours and enter
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'r the value on the data sheet. _
- f. If the charge-leakage per 24 hours exceeds 2% of the fullscale reading, tag the dosimeter as being leaky,
, and mark the tag with t,he leakage rate, date of test I and initials of tester.
- g. REPEAT STEPS a - F a second time. If the dosimeter does not meet the 2% criteria the second time, it is to be disposed of.
- 2. Camma Source Exposure
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- a. Record dosimeter serial number on Data Package 2 (Data Sheet 2).
- b. Post area where exposure.is going to take place.
- c. Adjust the hairline as in step G.I.a and log the reading in the Reading Defore Exposure column. ,
- d. Place t'he dosimeter (s) in the Dosimeter Exposure Board.
. e. Determine the time required for an-exposure of about three fourths the fu11 scale reading. Record in the l appropriate column on Data Package ta Sheet 2).,
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- f. Place a gamma source in the center of the board and !
,.. - start the timer. .
Read the dosime'ter(s) and record in the Reading After
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- Exposure column. -
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- 1. Determine the net e,xposure.
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- j. Determincithe efficiency by dividing the net exposure *
- by the calculated exposure. g (
I k'. The dosimeter indication should be within -10%, +15% of the calculated exposure. If it is not, it is probably . j defective. Perform another complete exposure on the
- dosimeter. .
- l. If the dosimeter does not meet the -10%, +15% criteria - ll' t' the second time, place the dosimeter in a " Fail Cal" .
i box for return to a vendor or disposal. tag i f....t - 7 i.*.7 Dosimeters are leak-tested and calibrateo twice
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annually, usually once every six months.
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H. CARE AND MAINTENANCE OF INSTRUMENT
- 1. Handle dosimeter with care. These instruments are delicate
and relatively expensive. .
Clean optical eyepiece of dosimeter with tissue paper as I 2. often as required. Also visually inspect its physical condition.
- 3. Check dosimeters for both loose and fixed contamination according to the following schedule:
- a. Dosimeters in use:
Chdck as of ten as- dictated by the possibility of their becoming contaminated.
- b. General dosimeters in dispensers: Check.on a routine
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J weekly basis. f
- c. All dosimeters: Check just prior.to their f
l charge . leakage test and calibration. .
- d. Immediately replace any personnel or general dosimeter found to be contaminated with an equivalent dosimeter
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- e. . Decontaminate and clean dosimeters as necessary by
,. . removing the clip and washing both the barrel and clip
.- with soap and. water. Observe applicable radiological safety practices and rules. Exercise care,
. particularity with the charging end.of the dosimeter.
- f. Immediately replace dosimeters when fou'nd defective. **
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