ML14097A290
| ML14097A290 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/04/1979 |
| From: | Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| TASK-AS, TASK-BN-79-17 BN--79-17, PNO-79-067J, PNO-79-67J, NUDOCS 7904050202 | |
| Download: ML14097A290 (6) | |
Text
IWMED IATE PRELIMINARY NOTIFICATION April 4, 1979 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCUR RNCE--PNO79-67J This p rliminay otificationlConstitutes sumary irnformration of an event of aty o public interest siqoifi ce.
The information presented is a sumify of information as of 70O am on 4/4/79.
FacilftV:
Thlee Mile Island Uni't.2 Midd-istan, Pennsylvania (ON 50-32)
NUCLEAR INCIoENT AT THARE MiLE $LAN Plant Status The tooling path to rei ovte core decay heat contintues to be through "A" stea generator to the main condenser.
Reactor prersure retmaing n(eat 1000 psi, with buIk core coolant inlet and
&outlet tpeture at 2 0 degrees r.
Core thermocouple rejdinqs are relativelv unchanged and indicate a maximum temperature of 46 degrees F which if well below saturation temperature for this pressure.
(Only thrwee thermorouples read above 400 degrees F.)
Gas is still indicated to be present baed on bubble size calculations, but its volume is.
elratiC indicating the effects of solubility and bubble dispersion.
Th!nt valve On pressuriter has been closed and deasificatioO continues through the 1letdin system.
Containment atmosphere s
inddleate aboiut.2.1% hydrogieO:. One hydriog en recembingr is operating and an 11-day time period is projected fdf reduction of the hydrogen contentration to ebout
%. At 1430 en April 3, one of three pressurizer level trapsmitters failed. Alternate methods of level measurements are bei nq developd and procedures reiewed for implem-entation while calibration can occur with the existing -detector,.
Plans ta USLea robot devite to obtain a p'imary Coolnt sa ple are beia evaluated. Prop testing with the root is in progres5.
The contamnenit building April a, 1979 gas sample results repseted o ag 2 of PRO-79-7I haVie beeft determilned to bL 'incorrect and sheI1 be di gaded.
CONtINUB 0 7904050202
C mt nud April 4,1979 Page 2.PO-79-67 E viron ental Status FUA has reanalyzed the river water saMple collectd the afternoolp oc April 2, 1979 at a location 2 miles doiwntrea The value o-39 picocies per liter indine-j[aipe/iUl rcported fo~r thi&
r~nPle (P1-79-671) has.
been found to b i crrt no idi
,btover -inimum detectable levels has been found.
ARMS flights were condqcted at 900 am dnd drO gPo on APH 1 3i f979.
The maximum radihtion levels were detected duringth 12ese a0 f I during which a naximum level of 2-0 mR/hr was Measured at i e f ror the plant; the level -at 3 miles was 12Z mR/hr.
At I L~o I
mri it thpe Pame wh e mile wde with centerlfTe about 290 Two other flights were condutd At a23 and 3:00 an.* o Apil 4..
The earlier flight easurT'd radi tio des o 0 fe't
. T ple 0.1 to 02 mR/hr at 3 miles at titudes of 600700 Pa The Plwme was 0.3 mile wide at one Rile centered at about 210 Pa t r1 the plume was undefined and radiation levels were about 00 ii/hr Th Thtr ligt eaured rzadiation levels of 1-1 mR/hr at I milt O.'s MRfhr at 3 iles and 0.3 R/hr at G milesv at an altitude of about S00 feet_
The Pl ane wds 0.6 MIL wide at a dista ce of 1 ?iti1 fro t the plants centered at 23V.
Offsite, grotind suryeys indicated about 0.5 riR/hr -for a bri ef p~eriod on the east side of the 5ite.
Radiation levels generally faqi9d ftrii Ol01 to 0.02 PR/hr around the site.
An air 5ample for iin2'-was collectqd in the PI UrI e at a lescatlon about 0.8, rifle $$E of the pl;ant_
The iod'ne conteltVrtiol in -ar a
less th~
~L l~-'mnicrocurii5 per* cub'c c n i t f.
Dose rates in populated areas as measured by NRC b cent dosieters (TLDs) showed a slight increase froc the previ day. Th hightst exposure rate was 0.41 mR/hr at a locgtion 1. nIle 5S of the Plnt olI owi g are the exposure rates for previously r+/-ported loctatoi!ns V0ose Rate (iliroefltgeri Der M~ur)
/179 4/2/79
.1/7
- O.of
.20 Falmouth 0215 Middletown
[405
.0 Goldsb!Aoro
.3.5
.05 Goldsbora 0.040
.05 Lewisberry 0.053 0.02
.PIeasant -Grove 0,041 0.02 1
York Haven 0.074 0.02
.10 Cnewagfe Hights 0,044 0.02
'0 Emigsville 0
4 0.02 CONTINUED
rontinued April 4, 1979 Page 3 Sumr~y~ ed EnvironmentaT Honitoringi Data concerning iodine released to the environment has been gathered and evaluated by the NRC, other Federal agencies, the State ot Pennsylvartia, and by the licensee.
Several of the mor0toring proirams have bee ongoing almost since the outset of tbEh incident which began early on 3/28/79.
This information is ba5ed on data avai lable to NRC as of 0630 April 3i 1979.
A total of 130 offsite water sdeye were 1
analyzed by NRC,.00E, and the Commonwealth of Pennsylvania. Rone of the 130 have shown. any detectable radioiodine.
-ased on calculations of the radioiclne released from the station to the river, it is estimated that the thyroid dose to any individual drinking the water is less than o.. mrem.
Air 152 offs.ite &ir samples were taken during the period 3/28-4/2 and analyzed by NRC, DOE, the Commnonwealth of Pennsylvania. and by the licencee at distances up to 40 miles from Three MiIe Islahd-The radioactivity in air which has been measured is principally noble gases--xenon isotopes. Eight of the 152 samples have indicated concentrations of radioiodine ranging from 2.7 x 10.': - 2.4 x.10 microcuries/cc. No radioiodine was tetected in the other SampleS.
The maxfmum act-ivity detected is about one-fourth of the permissible.
concentration established in the NRC "Standards for Protection Agins Rdiation," in Title 1Q. Gode of Federal Regulations, Paet 20 (10 CFR 20)..
Bd'on calculations -of the radoiodines released from the station to he atmosphere,.it is estimated that the thyroid dose to n.
individual at the site boundary is less than 50 Mref over a 5-day periad.
Milk A total of 56 samples were collected from about 20 farms, located mp to 13 miles in all directions from Three mile Islaftd. Of these, 38 showed no detectable radiojodine and 18 were reported.as "no data." These analyses were conducted by the Commonwe7lth of Ptnnsylvania.
FDA has conducted an a nalys4s of 9 milk taples colIleted April 1.
1979 &nd reported "positiven results-ranging from 14 to 40 picocuries CONTINUED
April 4, 1979
-Pa e 4
PNO-79-67J of 1-131 per liter of mil k-A sample of coat's mlk, collected on March 30, 1979, contained 41 picocuries per liter.
By comparison.
the U..S. Dpartment of Health, iducation and Welfare recommend5 placing dairy herds on :tored feed when 1-11 in milk reaches 1 O000 pCilliter_
Local herds are on stored feed because this is not the pasture season.
Based on measurements of the maximum concentrat on of vadioiodine in all milk. samples, the thyroid dose to any individual drinking aiilk is less then 0.5 mrem/day.
.Vegetatx1i
.4 One hundred seventy-one vagetation sapleshave been collected ano Analyzed by DOE, NRC, and the Cormonwealth of Pennsylvania.
None showed qny detectable.radioiodine.
These samples were taken at various locetions within 2 miles of the site.
SOne hundredforty-ve soil samples were collected and an ed by NRC &nd DO.
None showed any detectable radioiodine Iventary of Iodine in Plant The greatest quantity of iodine in the plant is contained in the core and the coolant.
The following table shows the inventory as of 0001 on 4/3/79.
Core*
Coolant"
-131 49 x 30 Ci
- 3.
x 10 as 103 Ci 0-12.x 310s C1
- Based on computer pro ections of Penn State University BHased on primary coolant analysis decayed to the above.
date and titimte A 5mall source of iodine is from the -industrial wate treatment syste (IWTS) which presently contains 272,000 yallons of wate havin an iodine content as follows:
1-131 0.234 Ci 1-133 0.00087 C-.
TOTAL
- O 247 Ci As of 2400 on 4/2/71, there yWe Apprxfimtely 240,000 gallons of liquid in the IWT5 with approxmately 280,000 gallons of avibe rage CONTINUED *.
0.u April 4, 1979 Continued 4-79-70)
-Page 5 space.
Currently, the turbine building sump is filling at a rate of approximately 30 gpm; however, over the last 2-day period the liquid has accuiulated in the system at an average rate of 1L43 gpm.
At the lter accu mulation rate, the IWTS would overflow at approximately 11:00 am on April 4. 1979 mnless other iction is taken-*' Efforts are undierway bIy the liensee to obtain state approval for dischargea The Iaximum concentration of tadioiodie in the 19 5 was x 10-pi at 1000, March 31, 1979...That value has steadily decreased. since that tiMe.
As of 1600, April 2, 1979, radioiodine contentration' in the IS was 4.Z x 10-' pjtilin which, when diluted in the plant discharge water would be about 1/3 off the technical speification limit-of 3 x-10 icrocuries per milliliter at the plant discharge.
Other Information The attached table of ColleCtive doses was prepared by a Jfi.t NtC/FiWIA study. goup.
Contact:
- DThompon, XE x28487 NCf-osel y) IE x28160 DistribLtion:
Transmitted H St At thai rman Hendrie Commissioner Bradford S. a.. hilh, slEcy Comissioner Kennedy Com.missioner Ahearne
_ laumarer, CA CommisTioner Gilinsky (Par Ditribtioh)
Transmitted:
MNB P. Bldg G. Davis. IE L. V. Gossick,
- 0.
R. Denton NRR Reion I H. L Ornstein, E00.
R. C. DeYouog, NRR Reion 11
. J_ Fouthard, PA 9L Mattson, NR*
Region III
_ M.. Haller, MPA V.:Stello, NRR Region IV R. G. Ryan, O5P R_ S. EoyiItR Region V H.R K. Shapar, ELC.
MDA W. J. MatsonN
- 4..
- 5. Btoydss N H.R. K.hoSapr SD White HouseSituati5 RChk EPCamaeC FfAA
.9Dvis I
PRELIMINAR~Y NOTIFICATIONi
.CTVDoS TO. POPULATI So5 MILES Of THREE MILE ISU\\ND
. NUCLEAR aGEEAgTING STATION
-whol-BodyAverage lose ole-tieoye to Individual Natural Background 0pplain) 233,60 2
one.
year's exposure (FES) u27,700 (1980 population)
Norma.1 operation (FES) (1970 popul ati on) 3
.O eexp (all sources) 1..
1
- 0.
01 30-year operation, iminary EsCtimEte of Accident Dose Cumlatveup to noon.4/2/79 toIo~ld~
CCumEulativos 1970 population 980. census. project ons Rote:
nrem (milli a
O ESe Gaseus ~f1Uflt5*
,~
0011 30-yea op~r~2.l
.S
.0.017
- n.
930 1970 po. &t 83 FES ~ na Env nrnnt~ StatemenIt