ML20154G256
| ML20154G256 | |
| Person / Time | |
|---|---|
| Issue date: | 08/31/1988 |
| From: | Liza Cunningham Office of Nuclear Reactor Regulation |
| To: | Congel F Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8809200308 | |
| Download: ML20154G256 (40) | |
Text
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UNITED STA'ES NUCLEAR REGULATORY COMMISSION o
WASHINGTON, D. C. 20666
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AUG 311988 MEMORANDUM FOR:
Frank J. Congel, Director Division of Radiat. ion Protection and Emergency Preparedness Office of Nuclear Reactor Regulation FROM:
LeMoine J. Cunningham, Chief Radiation Protection Branch Division of Radiation Protection and Emergency Preparedness Office of Nuclear Reactor Regulation
SUBJECT:
SUMMARY
OF A MtETING ON THE 8 F0r REVISED REGULATORY 4
GUIDANCE ON HOT PARTICLE EL'V, DES CF SKIN In response to a request from the Nuclear Management and Resources Council (NUMARC), NRC staff met with NUMARC and other industry groups on August 24, 1988.
The purpose of the neeting was for industry to present an alternative proposal for a standard which would limit hot particle exposures of the skin.
In addition to NUMARC, industry groups represented at the meeting were the Edison Electric Institute (EEI), the Electric Power Research Institute (EPRI), and several nuclear utilities.
Senior NRC staff members present at the meeting were T. T. Martin, NRR; F. J. Congel, NRR; and Z. R. Rosztoczy, RES.
An industry representative summarized recommendations contained in draft NCRP Report No. 101, "Recommendations on Limits Exposure to ' Hot Particles' on the Skin" and then presented their suggested alternative recommendations.
Their proposal adopted the NCRP's basis, namely, prevention of ulceration and utilized a model presentea in the NCRP report that involved limitation of doses to 2 krad or less beyond the "critical radius" of 1.8 mm at a depth of 100 pm.
The representative described how their approach would be risk-based, equating a risk of non-fatal cancer from hot particle exposure of 1 E-6 per 100 rads to a lifetime risk of cancer for whole body skin exposure of 1 E-6 per rem.
- Thus, in their approach, 100 rads of hot particle exposure would be equivalent to 1 ram of whole body skin exposure; the estimation of shallow dose equivalent from the skin dose would, in effect, use a quality factor of 0.01.
The shallow dose equivalent would be averaged over 1 cm2 at a depth of 100 pm and then be compared with the whole body skin dose limit of 7.5 rem / quarter.
The industry proposal also contained recomendations for evaluation of hot particles on clothing, and for medical evaluation and followup.
Copies of the viewgraphs g
used in the industry presentations are enclosed.
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,0 ki'1,g CONTACT:
Thomas H. Essig NRR di i
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S809200308 880831 PDR REYGP ERGNUMRC PDC l
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Frank J. Congel Agg 311988 NRC representatives indicated that this issue is under active consideration by the staff; & Generic Letter (GL) containing the staff's position on hot particle exposures will soon be issued for comment to other NRC offices.
[ Note:
The GL was issued for comment on August 25, 1988.
It contained recom-mended limits in terms of pCi-hr consistent with the NCRP report, rather than the dose /"equivalent" risk approach proposed by industry].
Original signed by LeMoine L Cunnlaghm LeMoine J. Cunningham, Chief Radiation Protection Branch Division of Radiation Protection i
and Emergency Preparedness l
Office of Nuclear Reactor Regulation
Enclosures:
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1.
Attendees - NUMARC/NRC Meeting 2.
Viewgraphs used in industry presentation a
Distribution:
JRTniezek, NRR LJCunningham, NRR 1
JEWigginton, NRR l
00 Lynch, NRR j
THEssig, NRR J0 Buchanan, NRR CSHinson, NRR l'
JAHartin, NRR
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WDiravers, NRR t
j RJBarrett, NRR i
JBell, RES c
I ZRRosztoczy, RES l
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DACool, NMSS
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REAlexander, GPA MVFederline, OCH l
RRBellamy, RI DMCollins, RII L
j WDShafer, RIII l
BMurray, RIV t
GPYuhas, RV I
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ENCLOSURE 1 NUMARC/NRC Meeting August 24, 1988 L. Cunningham NRC/NRR/PRPB F. Congel NRC/0 REP T. Martin NRC/ADT Z. Rosctoczy NRC/RES M. Williams Union Electric - NUMARC E. Rollins South Carolina Electric and Gas A. Machiels NUMARC (EPRI)
- 5. Medling South California Edison Company J. Buchanan NRC/NRR/PRPB Wigginton NRC/NRR/PRPB w.
J. Martin NRC/NRR/PRPB T. Essig NRC/NRR/PRPB
- 0. Lynch NRC/NRR/PRPB K. Travis Edison Electric Institute i
R. Warnock South California Edison L. Fairobent NUMARC M. Federline NRC/ Commissioner Carr's Office C. Hir. son NRC/NRR/PRPB R. Alexander NRC/GPA 9
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l Implementation Of NCRP Recommendations Concernina Hot Particles
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Ad Hoo Advisory Committee On Skin Dose Assessment I
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Def&n%Eone Critical Radius o Mesdmum D$ stance For
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Port phere0 Ce00 M0grc90cn i
e A Radius of (1.8 mm At A Depth of 100 um For Which:
"An acute exposure will NOT produce ulceration virtually regardless of dose" i
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Definitions Threshold Ulceration Dose ca Dese A910@ um E10c:s i
Wl1: 0 Produce U0ceration e 2,000 Red At Any. Point Beyond The 1.8 mm Crit 8cci Red fue l
4 Defhitions Hot Particle e Pofnt Source 1 mm Dfameter o PariHeDe On CONTACT Wi9h Sk?n e Partie o With NO SeDf-Abeerp9 ion 1
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Definitions Stochastic (Cancer) Risk o LBfet8me Rtek Of Non-Me0cnome Cancer:
1 H-3 per Red o LBfes8tne Alek Of Fated N/M Cancer:
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l To Wl mole-Body Sk8n Orradiation:
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Definition Summary e B!cDog5cc0 Effect of Concern 00cere0 Ben of The Sk0n CAN NOT Occur Of:
J Max Bata Range (Rmax) < 1.5 mm
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1 NCRP Recommendations Pdmag Basis 49 Preven 0 OBeeroflfen l
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NCRP Recommendations Conservative Ass' mptions u
ca Thresho8d Deee Based On Onf5n09e D{ek Source (14 mm Diameter)
- Threshold Dose For 1 mm Diameter Particle is 7,500 - 11,000 Rad o ThresheDd De For Mo8e9 Desquemation NOT Ulceration l
'a Threshold Correepende To That FOR RADIOTHERAPY OF LARGE AREAS j
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RECOMMENDATIONS FOR IMPLEMENTATION 1
RISK-BASED APPROACH i
e FATAL CANCER RISK FOR i
hot PARTICLE EXPOSURE:
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e NON-FATAL' CANCER RISK FOR l
hot PARTICLE EXPOSURE:
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l Recommendations For Implementation Based On Equivalent Risks:
AmeBgn Hot PedBcDe Dese As t9 WNo0e-Body SkBn Dese EquiveDent o Use Estehalehed Regulatory L6mit For WhoDe-Boc:y Skin Exposure Of 7.S Rem per Qucilder 6
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Implementation Methodology o Ce cu0c9e Dese Ueang VARSKL LosvBnger's, Or Other Me9hed o Average Dese Over 1 cm^2 Area As For WheDe-Bedy Sk0n Dese o Aeeume Point Source Geometry And Skin Depth of 1@@ um o Correc9 For SeOf-Absorp90cn
Comparison To NCRP Recommendations i
750 Rad Averaged Over 1 cm^2:
ll e < %@@@ Red e 1& mm UDeercc0 Ben CAX NOT Occur l
o Only 71 uC58Mee For Dee9epse WhBeh Can Irradiate Beyond Criticca Redlue 1
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A FUEL PARTICLE DATA.
PERCENT (%)
MAXIMUM ACTIVITY ISOTOPE ABUNDANCE RANGE (cm)_
(uci* Hrs)
Rh-106 6.090 1.4256 11.206 Pr-144 12.700 1.2078 23.368 Y-90 0.888 0.9306 1.634 Pm-148 0.017 0.7587 0.032 Sb-124 0.009 0.7452 0.016 Rb-86 0.004 0.6840 0.007 Cd-115 0.015 0.5832 0.028 Y-91 7.200 0.5832 13.248 Sr-89 5.010 0.5454 9.218 La-140 1.850 0.5346 3.404 Sn-123 0.086 0.4637 0.158 Nb-95 0.092 0.4408 0.169 Eu-156 0.275 0.4036 0.506 Ba-140 1.610 0.2970 2.962
' Pr-143 1.560 0.2858 2.870 0.125 0.1973 0.230 Eu-154 Br-90 0.888 0.1417 1.634 71 SciaRrs subtotals 38%
Pm-148 0.187 0.1121 0.307 Sb-125 0.188 0.1105 0.309 Co-141 8.760 0.1089 12.438 Zr-95 10.900 0 0830 20.058 Ce-144 12.700 0.0499 23.368 Ag-110 0.044 0.0482 0.082 Ru-103 7.930 0.0481 14.591 Eu-155 0.080 0.0324 0.148 Pm-147 1.480 0.0297 2.723 Hb-95 15.300 0.0169 28,152 i
Ru-10G G.090 0.0014 11.20G i
Subtotals 62%
113 Ci Hrs GRAND TOTAL 100%
184 uCl Hrs 1
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Recommendations For implementation Co-80 Particles o Rmax << 1.3mm CANNOT Produce U!cere90cn o Activity Which Producee 750 Red For FueB PerfleDes Producee only S00 Red Over 1 cm^2 For Co-SD i
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Recommendations For Implementation Particles On Clothing o Low Z Me9er$e0 Can Be Aeeumed To. Be 'T eeue HgulveDent
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NUMARC Recommendation Summa,q o A(Oow Convereien 07 Me9 Per9{c:e Deee To WheDe-Body Sk[n Deee Beeeca On Hguava ent Riske o Average Doee Over 1 cm*2 Area A9 A Skiin Dsp0h of 100 um Corrected For Se:f-Abeorption i
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1 e A00ew Dene$ty Thucknese Correc00en i
i For ParMcGee on C:o9 hang Based Cn EquBvcDont Sk0n Thacknees e Require Observe 90en For LLcerataen For Dose > 1,5@@ Red Averaged Over A 1 crn*2 Area By L0censees I
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