ML17037C187

Letter Enclosing a Report of a Technical Over-Exposure to Concentration of Radioactivity in Excess of 10 CFR 20 Limits

ML17037C187
Person / Time
Site:	Nine Mile Point
Issue date:	10/16/1975
From:	Schneider R Niagara Mohawk Power Corp
To:	NRC/IE
References
Download: ML17037C187 (8)

Text

REACTOR FACILITIES BRANCH PILE COPY NIAGARAMOHAWKPOWER CORPORATION

>t~II+,

NIAGARA ~

MOHAWK 300 ERIE BOULEVARD. WEST SYRACUSE. N. Y. I3202 0&obw lb, 1975

'0mectoe o$ Impe~n and En(oecement United S~u NucLeaIL Reg~tcg Commceamn Naehingkon, G.C.

20555 RE:

17ocket No.

50-220

'Deck SM:

Thkb noWP~on m sent Co you ~ accordance ~h 10 CFR 20.405.

A 4epoM o$ a Cec4ucaL ourn-exposure N concenMMon o$ tuukoactivkty Ln ex'$

10 CFR 20 Lan&a (oLLoIIIA.

One. o$ the N~ne NLe Po~et'~xon ~oCe~on Cechni~w enteILed Ae ceaMoe ae(ueLing cavity on 9/16/75 Co make.

a, ~ekun~nan,y covey o$ Ae jI.each< cavity "beLLoea" area.

The, Cechru,cian pm$ oened a contamination and dose-~e covey and Cook an ~ aampLe Ckuung CkQ eetrcy.

Upon exiting

)corn She aII.ea, he found himseLt'I contaminated Co a, genercaL LeveL o$ 3000 Co 4000 cpm on hQ haiIL and body.

A naItaL smears, 4xken at Ckte ~e hhoIIIed

~50, 000 dpm and

a. Peed contamination LeveL og 40, 000 cpm.

A$Zm ahoeetung and underdogng ruuaLLetug~on ameanabLe a~vkty use

<100 cpm and axed a~vkty Lua Chan background at hLe euaL presage and kQ geneIIaL body coetami~on LeveL un'ppeonmateLy 500 cpm.

The, Cechninun uxu Chan sent Co She IIIhoLe body countn uIheIIe he aborted 4he )oLLoeing Lev~ o$ a~vLty on hQ Pfut count Wken 9/lb/75 at 2100 ho~.

Co-60::

4921, nCL Mn-54 2187 nCL IC wee d&eIoILined Chat'IIIhoLe body 'coueting ueuLd continue Co )oLLoIo Che Co-60 a~vMy an oMw W deterunme c$ She man'a activity LeveL tea

due, W extetcnaL contamination oe due Co a, Lung uptake

)corn berg exposed W ~

conceeteationb above Chat aLLouIed by 10 CFR 20.

Subsequent IIIhoLe body counting data un's

)oLLoum:

I'7'tZ'~~&

~oMPBB 9/17/75 0225 Co-60 4091 372 Mn-54 1973 55

t

Page, 2

~lt

~~A

~ ~t oWPBB 9/18/75 1710 9/20/75 0125 9/25/75 410 10/9/75 1790 10/7/75 2140 10/14/75 1620 Co-60 Wn-54 Co-60 hfn-54 Co-60 Wn-54 Ca-197 1-131 Co-60 Ca-194 Ca-197 I-191 Co-60 Cs-134 CA-137 Co-60 CA-134 Ca-197 912 453 987 203 266 159 95 94 157 127 129 lb 155 190 132 152 121 124 24 4

1 5

14 1

1 2

14 1

1 14 1

1 Ba5ed on Che 10/14/75 cvhoLe body court and cumg ICRP RepoM <10 foenuLa foe Co-60 xn oxide.Joan foe Lung up&k@6, 'M Was dMeenined ~

She man'6 Lung up&he un'26 nCL.

Thee)oee bmed on XRQ data, M ueuld appar, Chat She Xech~n had'een exposed Xo aucboene conceefrcnWom at oe n~

10 CFR 20 magnum occup~naL'40 hocus. h(PC'a (a.e.

492 nC~

$o< Co-60).

F~hn xnvu~ation,

however, shove the foLLoeing:

The, ~ aampLe coLLected by Che tech'.e'en dueing kQ covey o$ Che "beLLouv" urea shoe Che ~ concest~mw Co be 9.9 x 10 6 uCL/cc

$o4 Co-60 and 2.2 x 10-6 uCL /cc Joe We-54 oe a Co~ o$

1093 x WPC.

2.

3.

The, aLLounbLe exposure ~e ~hoM amp~ocy ~oXe~n NouLd be, 2.2 nu.nuts.

V~ng an Lntnv~ev ~h Che Cechruekxn LnvoLved, he a~ed Chat he eu ~n Che gaea o$ Che high ~boene a~vLty Joe a.

peru.od o$

4 minLtee.

The, Cechru'.e'en eu, eeuu,ng a haL(-)ace mnk ~h a p~~e

+Llaw and chancoaL cadge bLt a~nce Chue mme me noC NIOSH approved (not approved fore 99.95 cemovaL bmed on 80P) ee

>seed a pcoXe~on

$aMo< o$

1 when ming Whee mme.

1

'I

'I I

~

e

Page, 3

Ened on thee (a~,

ee. have dWetunLned Chat M m LRely Chat Che, Cecku.cian o$ intWuZ eu involvedin a CechrucaL ourn-exposure Co 10 CFR 20 on 9/lb/75.

Ne have, made, an u~ate.

o$ Che, man'a expoame.

(Co Xhe, Lung)

()corn XhL e incident and Lt tvouLd app~

Co be, appeoxhnateLy 850 no>em.

Ne, have,LnMiated

Che,

$oLEoeing corvce~ve actions Co ~event a ee-

~nce, o$ ~ Cype o$ incident:

Revive and change, i$ necuaMy, She, S&e, RaNuWon Paotmtian Opemtmg Paocedutcu Co ewcvce Chat Ne, me, ape~ pcocedmu

$o< making coveys o$ tugMy contaminated confined uceab such m Che cavity "baLEoue" gaea.

2.

Review om aejp~oey peoXe~on paog~

and ev~e.

Xhe ace, o$

mid pNu.(ging h,ehp~oM.

Upgrade, Che, ~ning o$ Ae lmd~on p4otmti on technicians 4o betten. enable %em 4o cecogm,ze, Che. hazmch o$ enteu.ng highly co~nated con(ined Nceah.

Very ~y youfch, R.R. Schneid~

Vi ce, Pcehident-Ege~ Ope/t~oRb cc:

lSE Region I RA8/mm

'I h

h g

E 1

Attachment".to 10 CFR 20.405 Report for Nine Mile Point Unit ¹1 dated 10/15/75 License No.

DPR-63 Docket No.

50-220 Name of Individual:

Social Security Number:

Date of Birth:

Estimate of Exposure:

to lung John C. Coates 097-42-6193 February 6,

1949 850 mrem

0

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