05000482/LER-1988-028-01, :on 881209,individual Received Skin Dose in Excess of Limits.Caused by Unexpected Hot Particle Contamination.Review of Hot Particle Contamination Control Program Performed to Address Concerns
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Washington, D. C, 20555 4,1' 4
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Licensee avant Report Docket No. 50-482:
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to Event Report (LER) is submitted yi ;rab Centleseas in assess of ooooerning an orposure of an individuala revisio v
i attaohed Licensee This report is The 10 CPR 20.405(a)(1)(1) limits la 10 CFR 20.101.
1909 W oorceets erroneous the applicablewhich was submitted on Josuary 6, LER 88-028-00information in the attachment to the I
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88 4 8-01 Lieensee Brent Aeport Docket No. 50-482:
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Event Report (LSR) is outsitted y rat f
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LER 88-028-00information in the attaobeant to the very tut,ro.r.,
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peewn amo a tentf Creek Generatine Station 015l9letel(18l2 9 l0fl 014 Individual fleceives Skin Dose In Decess Of Limits As A Aeeult Of Ekmepected flot d
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e On Decacer 9,1908, at 1750 CET, an iniividual in the Itadiciogically controlled Area (ICA) was discovered to have a localized area of facial contaminaticri. Health Physics personnel =h==qimitly raroved a 8.7993 i
miczeCurie (uci) erh=1t-40 particle from his citin. 'Ihe individuni had been s.orkirg in the area of the polar crane inside the contairment bd1Aing.
Wtxt in the area we suspended while hot particle surveys were perfonned.
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'these surveys ideritified to unusual ocriditions and work was re===9
'the treutimsn possible time the in11vidual ecm21d have been exposed to this 1
particle was determined to be four hours and sixteen minutes. Using this j
exposure time, it we conservatively determined that the individual any have i
received an occupational does of 12.5 Men to the skin of the 44 tole body.
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'the individual ws precluded fran further fch entries during the quarter.
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rn11 cup ourveys conducted on December 19, 1998, identified an a&11tional l
0.03288 uCi Cabelt particle. Revieas were condacted of previous surveys of 5
the area and of records of previous contmaination incidents during the j
current refueling cartage to identify any similarities to this event. 'the review concluded that this incident is an isolated case. It was also j
determined based on relative isotopic abtridance that these two particles ha$
originated several years ago. A review of the ibt Particle contaninaticri control pergran did not identify any necessary programmatic changes.
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on Decesor 9,1988, an iniividual in the piediologically omtrolled Area (pcA) twee dim..d to have a lar=11 sed area of contaudnatism en his chin.
absequent evaluation initostad that the resultant exposure may ha This report is being submittas in accordance idth 18CrR20.485(a)(1)(i).
The ineoamat.icn required by 1styR20.485(a)(2)(b) isas provided separately as an This attachment is being attachemnt to revision e of this report.
resubmitted to m.ct erroneous irdar=. tion centained in the original enheittal.
nennerPrICEI CF EVDrr On Documber 9,1998, at 1304 CNT, several tsorkers entered the contaitument building (180 in on$er to perfone tsock on er=**=* thrust tsashers cm the At the time of this event, the unit tsas ir itade 6, Refueling.
Apprealmstaly 3e minutee latar, the tverkere actually bepn the i polar crane.
At proceeded to exit the R3 for shift turnover.
One individual, a otntractor, detected skin contamination tAile perfoaming a annual frisk at the frisking station 1ccated artarier to the Contairement personnel access hatdi on the 2647' elevation of the M1(arv mailding In amnnsance with staticn prm=&ree, the individual promptly le).
finalth Physics notified Health Physics pereennel of the situation.
persomal serifia$ that the centasaination tsas locata$ en the individual's chin, than escorted the truiividual to the decontassination tres of the ICA.
A hot particle of 68,806 net counts per minute $ses lifta$ from the in$ividaals chin using duct tape at 1754 arr. After the removal of the hot, It was carticle, to further contaminaticn tves detmetad cn the individual.
stbesquent.ly wrified through nonal senare and thole-body counting that the Conan truiividual had to detectable interns 11y depositmi radionuclides.
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spectroscopy analysts tsaa performed en the particle.e otsposed of 0.799 detennLned Fellcwirig discovery of the hot particle, teort twee suspended in the area of Health Physics pereennel perfeneed surveys for hot particles in the area in thich the individual had been tsorting and on tools the polar crans.
These surveys tsare couplete$ at aru$ equirement that had been use$.
approminately 2200 CST and identified no additional hot particles orFollowing ot unexpected grose contarmination.
wk activities wre ressed, with Health Physics personnel performing nore The sork has since been cxmpleted without further frequent nonitorirg.
significant incidents.
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.s The in11vidust and his ch tgrw intasviewed in an attaupt to Ma"*f 8r 4
uw most likely time ard location at SAid the hot particle had been picised 1
assei en the information dr.ained, it wee detenmined that the work had 1
involved some craw 11rq around due to t.ight, work space and scume repositioning
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of tools. Further hot particle surveys, with particular engtasis en the y
arwee in thich t?m tiu11vidual had most likely pidemS to the hot particle, were corducted on the morning of rse-e=,13, iges. Durirg these surveys one additional hot. particle was found in the area in thie the werkers tegursrily stored their teols. This second hot particle wee cruposed of s.es128 uC1 of Otelt-Se and 8.8316 uCi of 0: bait 68.
The investigation concluded the* it wee likely that the irsiivi&sai had beccw custmainstad then he deposited his tcols just prior to exiting a
omtairysant. 7twever, t, -==== this omelusion could tot be positively j
verified, it was ocneervatively
=====4 that the ocntaminatia) had coeurred at approximately 1334 cst, spen initiation of the work activities.
therefore, in detenminirg the skin dose to the individual untig the ~===*=r o
co$e VAMEKDt, the ses.xistan exposure time toes 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and 16 sairmatas. With this exposure time, the official dose assigne1 to this individual &se to a
this incident is 12.5 mese to the skin of the dele bcdy. the does
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the 18Cr708.181 permissible occtpet.icnal dose of 7.5 pass per quarter to the skin of the shole to$y.
I This done assigranent and its ramifications have been d1====9 with the s eriividual. In additicn, the iniivM=1 has been excluded from further entries into the ICA for the remairder of the calender gaarter.
pat 7f oosa Amo CDetsutTIvut ACTgs,,s ro11cwiry this incident, previously performed re knical surveys of the tree involved were reviewe$ for indicaticns of abrocmal contasairaticn. This revie. wra f a=1 thet there had been ro previcuely identified tot part.icles, in t he tres. No urusual rw111 tion levels or evideree of abrocual o;rituadnattest het been detmeted in the polar crane area. In conjunc-tien with this effort, records of previous incidences of personnel contmainaticn durtry the current refuelirq catege were reviend Ibr sintilaritise to the trendent dieeuseet in this report. No similarit.ies to this event were 14entiftet.
- n vs ef fort 'n toentify the ocurt:e of the hot particles detected in the p,lar crarre aree, the relauve abundance of Citalt 58 an$ Cebalt 6R of the perticles wss cyperwi to the relative abundance of these isotopes detected in roosnt sarple analyses. From dets crapariscos, it wss detennined that
- b-se particular particles hto rot originater$ from current refuelirq vr.4 v a tt es. txt. htd er.mt Itkely been created several years prior.
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