ML17272B042

PNO-79-67L:summary of Info Re Nuclear Incident as of 790406. Describes Plant Status,Environ Status,Population Exposures & Industrial Waste Treatment Sys Activity

ML17272B042
Person / Time
Site:	Crane
Issue date:	04/06/1979
From:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
TASK-AS, TASK-BN-79-17 BN--79-17, PNO-79-067L, PNO-79-67L, NUDOCS 7904120001
Download: ML17272B042 (5)

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IHHEDIATE PRELIMIi'IVORY HOTIF ICATION April G, 3979 e

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PRELIt<IHARY NOTIFICATION OF EVENT OR UHUSUAL OCCURAEtT'CE""PHO-79-674 This reliminar notification constitutes su@mar information of an event of safet or ubl>c interest s

. n T'ence.

The. information resente in a

summar of in orma on as of /;

0 a.m.

on 4 5 79.

~Faei'lit 'hree Hile Island Unit, 2 Middleton, Pennsylvania (DH 50-320}

~Sub'act:

NUCLEAR INCIDENT AT THREE HILE ISLAHD Plant 5tatus Reactor pressur e is about 1075 psi vith bul k cot e cool ant in'let and outlet temperatures at about 285 degrees F.

Core thermocouple readings are relatively unchanged and indicate a maximum temperature of 448 degrees F,

>leal below saturation temperature for the present reactor pressure.

Three thermocouple readings remain above 400 degrees F.

Thirty tharmo-couples are being mpnitpred, Containment atmosphere measurement.

fndfcate lass t,hen 2X hydrogen One.

hydrogen recombiner is in operation, with the second unit on standby, I

A Heise pressure gauge. installed to provide an alternate method cf monitoring pressurizer

level, has been unsatfsfactor(')y pressure tested.

(Boron crystals indicate leakage from an elbow in the bypass lfne around th sample cooler. )

Plans tp vent Hake=Up Tank (NUT) and one of the Haste Gas Decay Tanks,

(<)GUT) gases to containment have been approved by the NRC Haste Gas Decay Tank "A" venting to the contafnment was started at approximately 0545 on April 6, 1979.

Venting was terminated at. 0630'o'llowing an approximately ten-fold increase fn radiation 'levels detected by the auxiliary building exhaust. monitor.

Environmental Status Periodic ground level radiation surveys performed on April 5, 1979 by the NRC survey teams on the east and west sides of the Susquehanna Rfver from a distance of 4 miles north tn 4 miles south of TMI detected radiation leVelS aVeraging laSS than 0.01 mR/hT On the weet. Side and frnm 0.01 to

0. 15 mR/hr on the east sfde.

Prevalent wind direction during the day was-from the west-northwest.

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April 6, 1979 PNO"79"67L s

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AR~lS surveys tvei'e per formed on April 5, 1979 at 0600,

0950, 1430, 1515

7649, and 2120 hours0.0245 days <br />0.589 hours <br />0.00351 weeks <br />8.0666e-4 months <br />.

The flights identified the plurne in the sector ll0 to 130 The maximum radiation levels tlIQre detected du~ing the 0950 flight during which levels of 0.3 mR/hr Were measured at 1 mile

. Between 3 and 70 miles, the measured levels pere from 0.03 to 0.05 mR/hr The State of'.Pennsylvania reported data on milk, Mater, precipitation and grass samples.

Analysis of ten milk samples collected on Ap> il 4 and 5

detected nO r9adiOiodine above the minimum deteCtabIe aCtiVity (HDA).

Also, the r'exults of ana'lysis of Ma er samples collected from five cities su>'roonding THE from ttarch 37, 7979 to April 4, 1979 detected no levels of iodine above the NDA, as did analysis of precipitation and grass sasmpl es foT April 2 and 4.

Dose rates in populated areas as measured by NRC thevnolutainescent dosi-et',ers (lLDs) showed only minor changes from thE: previOUs day.

tlinor fluctuations are expected at these lou dose rates'en additional TLO stations it ar'ea ichools ~e're established on April 5 (making a total of 47 stations).

Folios>ng are the exposure vates for previously reported locations Dose Rot'e Nil'liroentget)s Ws s ~

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4/I/79 4/2/79 4/3/79 4/4/79 4/5/79 s

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Goldsbor o Go 1 dsbo'r.o Lewisber ry Pleasant Grove.

YorJ: Haven Cone@ago Heights Emigsvil 1 e

0. 75 O.on

0. 73

0. 04 0,05 0,04 0- 07

0. 04

.0-05 Po ulation Ex osure Estimates

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0. 01

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0. 02 0,02 0,02 0,02 0,02 0,02

0. 20

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0. 02 0.62.

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~a ss Representatives fvom NRC, EPA and HE'r/ have made estimptes of the radiation doses to the public around THL based primarily on TLD.data.

The calculated population dose increment for 4/3/79-to 4/4/79 is 70 man-gems.

The total cumulative, 50 mile radius population dose s lnce 3/28/79 is estimated to be 2100 man-rems with an aver<age dose ta an individual of 1. 1 millirems.

The estimated maximum dose to an individual offsi'te (hypothetical, con-tinuously present 0.5 mile NE of plant) is estimated to be less than 100 mi 7 litem ~

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Cont,inLred Page 3

April 6,. 1979 PHO""/9"5)'L lndustr'ial Waste Treatment S stem gI~(ITS Industr'ial Mste dischm'ge (other'han sewage) began about

~ a-m-, 4/6/79 at an ave) age rate ot 100 gpm Mich Iodine 131 radioactivity of '2 3 x la-~

microcuries per milliliter into thy 58,000 gpm cooling tower discharge to the river.

The Unit 1 HQStb GVQpbratOr COndenSate'torage tank is also being discharged, The licensee has calculated the release ta the rive'r to be about, two-thirds the t)PC for continuous discharge of Iodine 13[,

7rbll'r bOth UnitS.

The di Charge fr om the Unit 2 Industrial Waste Treatment.

SysteN Nels stopped at approximately 0400 on 4/6/79 to callect and analyze a Gamp) er Other Info<'Nat,'fbn IE Bulletin 79-05A was issued an April 5, l979 and required additional actions by BabcocI< and Wilcox power reactor facilities with a operating

license,

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Contact; Dist'ribution:

Transmitted Comissioner Kennedy Covxissioner Gilinsky Iia>>emit>>ed:

llllBB~P'I /e L.

V. Gossick, EDO H.

L. Orrrstein, EDO J. J.

Fouchard, PA N.

H. mjler, iiPA R. 6. Ryan, OSP H;

K. Shapar, ELO H St/~" ++

Dommi eai ooaPBeadfor d Commissioner Ahearne H.

R.

0 nton, NRR R.

C.

QeYoung, flRR R. J. Hattson, NRR V Stello, HRR R. 5.

Boyd, NRg 55 Bldg <<~>~r 0l J. Dircks, NMSS 5.

L.evzone, RES S. J. Chilk, SECY C.

C.

Kmc;erer, Ch (Fbi Oistl'fbUtion)

d. g.

Dec{a, IE Regime I

'04 Regioo II ~~l Region IIIL;~)

Region IY.~~

Region 'Y~~

(HAIL)

Cummings.

OIh R. Hinogue, SD lE (TNl) Sic.e; 'P

~(Provide copy to STATE)

White House Si tuat br bbm EPA pga/san DDE/EOC 6'DDA/FEi&

BAP {Bteta ot'7%r DCf'A H84 Handcarry

{FAA)

IHHF.DIATF.

~R'ELIHIHARY t)OTIFICATION

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