ML19224B231
| ML19224B231 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/12/1978 |
| From: | Metropolitan Edison Co |
| To: | Mullinix W NRC/IE |
| References | |
| 1612, TM-0081, TM-81, NUDOCS 7906140263 | |
| Download: ML19224B231 (9) | |
Text
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'DfI DOCUMENTS
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DOCUMENT NO:
{f, 79 0F DOCDENT PROVEED M COFI MADE ON METROPOLITAN EDISON COMPANY.
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Wilda R. Mullinix, NRC
_2 7906140263 193 245 e
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1612 Revision 6 C6/12/78 CONTROLLED COPY THREE MILE ISLAND NUCLEAR STATION S MTION HEALTH PHYSICS PROCEDURE 1612 MONITOP.itlG FOR PERSONNEL CONTAMINATIONIV ASTER COPY Table of Effective Pages J O N O Eate R E Mevi
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Page Date Revision Page Date Revision Pace i.0 06/12/78 6
2.0 03/24/75 1
3.0 06/23/76 4
3.1 06/23/76 4
4.0 08/25/75 2
5.0 08/25/75 2
6.0 09/22/77 5
7.0 06/23/76 4
8.0 08/25/75 2
Unit 1 Staff Recogime ds pproval linit 2 Staff Recca end A roval Approval
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Date "_
Approval
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Date CogrlizaWDfpt.' Head CognilantMp:/ Head Unit 1 PORC Recomme s Approval Unit ORC Rec mmends Approval M
Date S-M8 Date
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t Ap r val Unit 2 Superintendent Approval Date (
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ff Manager Generation Quality Assurance Approval Da te -
TMs 55 A R ow 8/7 7
1612 Revision 6 06/12/78 THREE MILE ISLAND NUCLEAR STATION ST/710N HEALTH PHYSICS PROCEDURES 1612 - Monitoring for Personnel Contamination 1.0 PURPOSE This procedure describes the use of personnel monitoring instrumen-tation.
2.0 DISCUSSInq The prevention of contamination is primarily the responsibility of the individual.
To assist personnel in the control of radioactive contamination, monitoring devices have been. provided at various points within the controlled area.
These araar most have packground levels sufficiently low enough to allow the monitoring instruriest to detect contamination levels greater than those of a clean area.
If a monitor cannot be provided at a step off pad due to elevated background levels, the individual will use the nearest available monitor.
The Radiation Pr otection Dept. rtquires all individuals to monitor themselves for contamination when exiting the controlled area.
3.0 REFERENCES
3.1 Radiation Protection Manual - AP 1003 4.0 EQUIPMENT 4.1 Frisker (RM-14) with side-window G.M. Tube.
4.2 Portable Survey Instruments (Alpha and Beta-Gamma) 4.3 Hand and Foot Monitor 4.4 Portal Monitor
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193 247 i.0
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- 1'612 03/24/75 Revision 1 5.0 OPERATING INSTRUCTIONS 5.1 Friske- (RM-14) 5.1.1 The Frisker consists of a side-window Geiger-Meu11er probe and a count rate meter with visible and audible aiarms.
In order to detect low levels of contamination, a Frisker may be located at the step-off pads.
5.1.2 Place the ON/0FF Switch to the most sensitive setting.
Open the Beta-window so that both Beta and Gamma radiation is detected.
The instrument should read background.
Note background level.
5.1.3 The instrument alarm will be set at 100 CPM above background by Radiation Protection or other designated personnel.
NOTE:
Surveys must be perfcrned in low background areas.
5.1.4 Always check the hands fo" contamination prior to handling the probe.
Keeping the probe h inch from the surface being mon:torea, pass the probe over tne surface slowly 20 that the instrument has ample time to respond to the contamination. All exposed parts of the body (face, hair, neck and hands) and clothing should be carefully checked.
Shoes (although covered when on the contaminated side of the stepoff pad) must be monitored thoroughly for contamination.
NOTE:
Avoid touching any potantially contaminated surface with the probe to prevent ~possible
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probe contamination.
I93 248 2.0
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1612 Revision 4 06/23/76 5.1.5 If the alarm sounds notify Radiation Protection Personnel for assistance.
NOTE:
In the event that personnel contamination is found, Radiation Protection Personnel will complete Sections 8, C and D of Contamination /
Exposure Reports form 16121.
5.1.5 If detectable contamination (greater than 1000 dpm above background) is found on the head or shoulders of the individual; nose swipes will be taken and counted as follows:
5.1.6.1 Swipe inside of each nostril with cotton-tipped swab.
5.1.6.2 Break off wood stem, leaving cotton tip and small section of wood stem (tip must fit onto 2" planchet).
5.1.6.3 Count cotton-tip for gross By activity.
5.1.7 If gross By count from nose swipe is greater than 5000 dpm, count the swipe on the Geli Detector to determine isotopes involved.
Forward results to Radiation Protection Supervisor.
5.1.8 If gross sy count from nose swipe is greater than 10,000 dpm, notify Radiation protection supervision immediately.
A Whole Body Count must be scheduled for the period between the 6th and 12th day post uptake.
5.1. 9 If gross By count from nose swipe is greater than 50,000 dpm, notify Radiation Protection Supervision immediately.
A whole body count must be performed as soon as possible.
NOTE:
Based on the Geli analysis of isotopes involved, Whole Body Counting requirements of 5.1.7 and 193 249 3.0 1
1612 Re/ision 4 06/23/76 5.1.8 may be altered with the approval of the Supervisor of Radiation Protection and Chemistry.
5.2 Portable Survey Instrument 5.2.1 Beta-Gamma Survey Instruments 5.2.1.1 A Beta-Gamma portable survey instrument consists of a Geiger-Meuller probe with a beta window which can be opened or closed. The probe is attached to a readout meter. There is no alarm system on the instrument.
5.2.1.2 Place the ON-0FF switch of the portable survey instrument at the most sensitive position.
Open beta window so both beta and gamma radiation are detected.
The instrument should be recording background radiation.
Note background level.
Follow the same monitoring procedure outlined in Section 5.1.4.
5.2.1.3 Because there are no alarms on Beta-Gamma portable survey instruments, the meter response must be observed while surveying.
Increases greater than 100 CPM above background indicate that contamination is present.
Notify Radiation Protection Personnel for assistance.
5.2.2 Aloha Survey Instruments 5.2.2.1 An alpha portable survey instrument consists of a scintil-lation detector probe with a rate meter. There is no alarm system on the instrument.
The scintillation detector is covered with a thin layer of mylar which allows alphas to pass through to the detector but blocks out all light.
193 250
08/25/75
'.1612 Revision 2 5.2.2.2 Place the ON/0FF switch of the survey instrument at the most sensitive position.
Background readings sould be zero.
5.2.2.3 Point the detector at a light source, e.g. fluorescent light.
If upscale reading is noted, a puncture may exist in the mylar window.
Return the instrument to Radiation Protection Personnel.
5.2.2.4 Follow the same monitoring procedure outlined in Section 5.1.4 Note:
It is important that the probe be kept inch or less from the surface being monitored since the range of alpha parti-cli; in air is only a few centimeters.
5.2.2.5 Observe the meter response while surveying.
Any stable upscale reading indicates alpha contamination is present. Notify Radiation Protection Personnel for assistance.
Note:
In the event that personnel contamination is found, Radiation Protection Personnel will complete Sections B, C, and D of a Contamination / Exposure Report, form 1612-1.
5.3 Hand and Foot Monitors 5.3.1 Hand and Foot m nitors r= aide monitoring cavities for both right and left hands s. well as right and left feet.
Each cavity consists of four Geiger-Meuller tubes.
Individual meters record the counts per minute for each cavity. Visible and audible alarms indicate the location of contamination greater than 100 CPM (or as set) above background.
A hand-held Geiger-Meuller tube is also available for monitoring other parts of the body or articles being carried from the controlled area.
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08/25/75 1612 Revision 2 5.3.2 All personnel leaving a Controlled Area shall monitor themselves and all hand-carried items before entering a clean area. The individual shall monitor himself by placing his hands and feet in the appropriate cavities of the Hand and Foot monitor. The person should remain in this position for a minimum of 10 seconds.
If the alarm is activated, notify Radiation Protection Personnel for assis-tance in decontamination.
Briefcases, notebooks, tools and other items being taken to the clean area must be monitored with the hand probe (beta window open).
5.3.3 All alarms on the Hand and Foot mcnitors have been preset by Radiation Protection Personnel.
Note:
In the event that personnel contamination is found, Radiation Protection Personnel will complete Sections B, C. and D of a Contamination / Exposure Report, form 1612-1.
5.4 Portal Monitor 5.4.1 The portal monitor consists of a frame enclosing seven Geiger-Metiler probes and a foot pad with four G-M detectors.
These detectors are connected to a console which has a simplified, visual readout.
Lights on the console are as follows:
ALARM:
Activated when designate count rate is exceeded.
COUNTING:
On during counting time.
RECOUNT:
On when light beam in portal frame is not broken for duration of counting time.
SAFE:
Ncrmally on; off when counting, alarmed, or recounting.
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When on, it inhibits the alarm of each of the counter modules.
5.0
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1612 Revision 5 09/22/77 FAILURE: On if a pulse has not been counted within approximately 30 seconds.
This light
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switches off when a pulse is counted.
In addition to the visual alarm, an audible alarm also indicates contamination.
Alarm lights are also located on the frame to indicate area of contamination.
5.4.2 All personnel leaving the Access Control Point will pass through a portal monitor.
A second portal monitor is proiided at the exit of the service Building to the North Parking Lot and may be used by individuals as a final. check for contamination.
5.4.3.1 Breaking the beam of light between the side of the frame initiater counting.
Count time is approximately 10 seconds.
If contamination is detected, the alarms on the console will be activated as well as the alarm light on the frame corresponding to the area of contamination on the body.
If the alarm sounds, contact Radiation Protection Personnel for assistance in decontamination.
5.4.4 If the RECOUNT light is activated, the individual did not
- emain in the Portal Monitor throughout the duration of the count.
The individual must step back in the Portal Monitor and be counted again. When a green SAFE light is activated on the console, counting is complete and no contamination was detected.
5.4.5 If the red FAIL light is activated, notify Radiation
-j Protection Personnel for assistance.
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' NOTE:
In the event that personnel contamination is found, Radiation Protection Persornel will complete Sections B, C, and D of a Contamination /Exposdrh ephh[(3 from 1612-1.
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Form Jdl2-1 1612 Revision 4 06/23/76 CONTAMIflATION/ EXPOSURE REPORT LOSS OF PERSONAL 00SIMETRY PERSCNNEL CONTAMINATION
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Name Company Department SS#
Date Time Address (If not Met-Ed)
A.
LOSS OF PERSONAL 00SIMETRY Section 1 - Film Badoe/TLD 1.
Date Issued Date Lost 2.
Dosimeter reading covering lost Film Badge /TLD period mrem 3.
Reading entered on individuals Radiation Record:
Yes No 4.
Individual restricted from controlled area:
Yes No Section 2 - Self Reading Dosimeter 1.
DosimeterLost[.__
Dosir.eter Off Scale Date 2.
Film Badge /TLD Evaluated:
mrem 3.
Film Badge /TLD Reissued: Yes No 4.
Individual restricted from controlled areas:
Yes No B.
PERSONNEL CONTAMINATION:
1.
Contaminated Body Areas Survey Results Highest DPM
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l b $5A 7.0 i
1612 Form 1612-1 Revision 2 af*;iFRCOMNEL CC"TAMINATION:
(Cont'd) 08/25/75
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Method of Cecontamiriation:
3.
Cecontaminated Body Areas Survey Results Highest DPM 4.
Sample for urine Bio collected:
Yes No 5.
Individual sent for Whole Body Count:
Yes No C.
INVESTIGATION REPORT- (Include R.W.P. #)
Form Completed By:
D.
RESULTS OF INVESTIGATION:
(Completed by Radiation Protection Supervisor / Foreman)
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Approved By RP Supv/Forernan
_f Original:
Individual's Radiation Hjstory File cc: HP Lab
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Manager - Gen. Oper. - Nuclear Unit Superintendent Supv. - Radiation Protection & Chemistry lg} 45c q
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Safety Representative Jni;vidual's Supervisor
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