ML19220B078
| ML19220B078 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 01/25/1978 |
| From: | Zimmer G NRC OFFICE OF STANDARDS DEVELOPMENT |
| To: | Boyd R Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML14358A173 | List: |
| References | |
| NUDOCS 7904250301 | |
| Download: ML19220B078 (7) | |
Text
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. MEEORAMCUM FOR: Roger S. Soyd', Director Divisien of Project Management Office of Nuclear Reac:ce Regulatica FRCM:
Glenn W. Zi=er Occu;atienal Health Standards 3 ranch Office of Standards Cevelec: ant THRU:
Robert B. Minegue, Director Office of Standard; Cevelep:.ent SU2 JECT:
NE'JTRClt EX?CSURE AT COlfiERCIAL pC'.lER REACZRS Recently it has c::e to y personal attenticn that personnel at scme corn.ercial power reacters are receiving scme neutr:n ex;csure which heretofere-has been unknown. A parantly these ex;csures have gene un-noticed because of t.5e inadequacy of the neutren ceasurement technicues e=cicyed, and insufficient knculacge of this field.
I understand that neutron ex;csures Of up to a few hundred miliirems in a relatively shcrt I:
pericd of time (a few hours Or days) are ;cssible (see attacted Table 1 and Tabl e 2). Adciticnally, I understand f ent anctner source that neutren fields of 25 key neut ns superi. ;csed on the 1/e neutren spec-unt exist at a PWR which is kn wn about. Meutrens of this energy cannot be
=easured by the NTA film which I understand is in use at that Mactor.
I do not krew if the tice-centrolled persennel neu: :n exposures at that facility are being re cr:ed : N'iC or not.
The significance of this, in my view, may be c:ncern about the adequacy
'of reac r snielding and the c:nt 01 of ex:csures to reactor cperating perscnnel. The previcusly unevaluated neutren c:ntributien t; the total dose equivalent ay be significant, particularly if the cur-ent c:nsider-aticn of the neut on quality fact:r results in the assign. ent of higher quality factors thereby causing higher m values.
/
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,,r._-s Glenn W. Zi=e.
Occucatienal Health Stanc -ds 3 ranch Office of Standar s Ceveic;cen:
Encicsures: Tables 1 and 2 73 116 yo Y 1 (6 30]
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SPECIAL STUDY SPECIAL PURPOSE BADGES AT A PWR SITE 1
a Table 1.
Dosimeter 10 No.
Penetrating Skin Thermalbeutrons Fast Neutrons Dose - mrems
~
SOS 1.6SE42 1.6SE*2 4.76E-1 0
165.4 O
507 1.42Et2 1.42E42 4.4SEtl 1.43Et3 1616.5 616 1.39Et2 1.39E12 1.50Et0 5.37E+1 194.2 517 1.33E+2 1.33Et2 5.60Etl 4.67Et2 656 Sin 1.33E12 1.33Et2 5.53E+1 4.93Et2 681.3 S19 2.42Et2 2.42Et2 1.76E42 7.71Et2 1189.0 S20 4.51Ei2 4.SIEt2 4.72Et) 1.06Et2 604.2 i
~
609 1.360t2 1.36Et2 4.120-1 0
136.4 643 1.31Et2 1.31Et2 4.92E-1 0
131.5 64S 43Et2 1.43E42 6.27E-2' 0
143.06 (1Lo te :
(t2, etc., type designation is the exponent for the factor of 10.)
The above data is information that was passed on to me in a personal conmunication.
It is understood that the data as shown above for fast neutrons has not been corrected with a calibration factor. Occause the thermoluininescent dosimeters were calibrated against Cf-252 instead of for the spectrum that tids thou9 t h
to pertain at the site,it is expected that the fast neutron data may be h19h hy a factor of 10 Therefore, I have personally applied a factor of 10 reduction to the fast neutron column of fi9ures added the penetra-c d
ting exposure, thermal neutron exposure, and fast neutron exposure af ter it had been corrected downward by' a fact (ir at 10 to obtain a total mrem dose. This is shown in Table 2.
N H
=Q -
l
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Table 2 l
Dosimeter 10 No.
Corrected fast Neutron Total Neutron Dose - mrems l
505 0
.4 165.4 h
507 143 187.5 329.5 516 S.3 6.8 145.8 4.6 [
102.7 235.7 S17 518 49.3 104.6 237.6 519 77.1.
253.1 495.1 i
520 10.6 5 7. 11 508.0 6(19 0
- 4 136.4 643 0
.5 131.5 645 0
.06 143.06 9
s,.
C4 lhe corrected fast neutron was obtaltted by decreasing the fast neutron listed th Table 1 by a factor of 10.
lH The total neutron was obtained by adding the thermal neutrons listed in Table 1 to the corrected fast neutrons.
H The dose in inrems was obtained by adding the penetrating and thermal neutrons from Table I to the corrected fast neutrons from lable 2.
I e
i
- a Pre 1 N nary Value-I= pac: Assessment for Task I:1:ia:ica to Develcp a NRO Staff Technical ?csi: ion en Neu :en Quali:y Fac:ces I.
The ?:cpesed Ac:ica A.
Dese:1stien Develop the NRC S:sff ?osi:icn cu :he need :o revise 10 07R Part 20 to reflect recent scie- - '#-dings advanced by Dr. H. H. Rcssi, and to assess rels:=d regula:ory practices if the hypocheses advanced by Dr. Rossi are valid. This
- ask does cet include a=e-e es: ci :he regula:ie:s if such is varras:ed.
3.
Need fer the Precesed Acticn a
Dr. H. 'd.
?.cssi of Colu=bia University, u:ilimi g the predictad dose to bene :::::v develepad by Dr. T. D. Jones (1) clai=s (2)
- o have deter =ir.ed tha: there is as-increase of leuke=ia at lev-deses of scut;::s, and rec====ded a increase in the quality factor (Q) for neu:::cs, thereby reducing the allowable exposura.
The Office of Sca:dards Devele;=ent c June 21,1976 estab2.ished a' task g up to review and a:aly:e Dr. Rossi's paper, and rece==end ac: ice.
~he :ask :: up repo:: (a tach =en: 1) and supporti g da:n (at:ach=ect 2) were raviewed and :he recer=:en-dati:n of the task g; cup repc : that N?.C "imi:14:a a :hc cugh 3
review, solici:ing ce=:en:s a:d discussie: f::= others in ebe scies:ific c d:7 :o a nive a a valid decisicu, and rec =-
=erded actien" was ecucur ed is by :he Direc:::, Office of Standards Develep en: (a::achsen: 3), who directed : hat ac:iv-1:les to reach a c:: census N?.0 staff :echnical pesi:icn be ini:14:ed.
C.
Need for 'E?A Assess:en:
Nece.
II.
Alternatives A.
Alter:a:ive ac:1ces are enu=erated under Tab !+ cf a::ach=e:: 1.
3.
A1:c :acive 6 h a been judged viabla.
III.
? bable Valna/I=rae: cf the ?recend Acti n A prelisiaary 7alue/;=pec: Appraise.1 is included under Tab 5 cf at:sch=ca: 1.
Addi:icn:1 Valuc/I: pac: info::a:i:n is enuncia:cd bel:v.
'/3-119
3 5
> =
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A.
- NRC A
na 1spac ce the NRC staff of this ac:ic: vill be the expendi-ture of NRC rescurces c ace: plish the task. Bis allocatica of resources is ce: preses:17 is:crpora:ed i: the CES3 ebj ec-tivas a:d is so. included in :he SHSS five year plan. I: is an:1:1 paced :ha: due :c'the e==ple=1:7 ci che review and aca17 sis
- the "ac:: plish=e:: of :his :ask vi:hi
.he reques:ed 6-sca:h j
ti=e-tra=e vill causa a delay of ini:ia:is of sc=e 'serk sichin CES3. As as 1: dica:ics of :he cesplext:7, the NC72 has had l
two scie::1fi: ::==1::ees reviewing this verk for app::xi=a:ely six =ccchs.
he value of this :ask is :ha: 1: vill de=c=s:: ate that the NIC is an indepe= den: agency keepia; abreas: of cur en:
develop =es:s in :he nuclear area, developi g its cv: indep e: den:
judg=en:s, and.aki=g ac:1 :' ace :dingly :c assure p;cper standards for radia:ic: p ccec:1 cf occupa:1cca117 exposed verkers and the public.
3.
C:her Cover =e : Aze:cies a-d "us t: -
i This task vill sc: have any i= pac:== c:her gover =es: agencias c: 1:dus::7 Eevever, if :he resul: of this task is a finding that Dr. Icssi is cor ec: 1: whole or is part there==uld be 1= pact upes c:her age::les a=d i:dus::7, i.e., =cre research ce 1
neu ::: desi=e: 7 =ay be required, and :hese agencies cud indus:-ias that have perse=rel veri 1:g vi:h eu:::: pr:duci:g equip a=: c scurces =ay need to revise thet: radia:ics p ctec:ica pr gra:s or
' ns:all addi:icca.1 shieldi:g, thus a 3:sa:e: expendi:ure Of funds.
i l
The value of this task :c =cher agencias a=d i=dus: 7 is :ha : hey can be ssured :ha: 520 is keepis; its standa is ce==essura:e vich available scia :1fi: fi: dis;s.
C.
Publi:
The i= pac: of :his proposed actice== the public veuld be the expe:di:ure of :ax dellars to ac==plish :he :ssk.
he value of this :ssk =c the public is :ha: they can be assured :ha: NRC is i
keeping 1:s s:2:dards c:=:e=surata with available scian:if1:
!L dings.
I I7.
Kalaticeship :: C her Existi=g c; ?:cpesed Federal, 5: ace c: local Regulaticus : ?cli:ies
~
A.
Ir ec:ed Conflic: of C:sf: =a e
It is c:.<.ncv whe:her er no: other Federal, 5:a:e c: Iccal l
age:cies are evalua:ing ':. Rcssi's vc k, as is is:e:ded by the I
iniciacic cf :his :ask.
.See attached Me:c.
r. 9 - - ' 'L' O Q /C tu k
a
)
1 3-J 7.
Reccc=esdatica 4
I:: is recc= ended thac task iniciatice of the p;cposed ac:1:n be app cved.
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'73--121
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. 4 REFERE?;CES 1
l (1)
- 7. D. Jones, " Radiation Insult to the Active 5cne Marrew as Fredicted by a Method of CHCRD's," Cak Ridge flational Laboratory Repcrt ORiiL-Tit-5337, 1976.
1 (2) Harald H. Rossi, "The Effects of Snail Doses of Ionizing Radiation:
Fundar. ental Bicphysical Characteristics," cresented at the joint annual
- eeting of the Health Physics Society /Radiatica Research Society, I
San Francisco, June 29, 1975.
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