ML17272B046
| ML17272B046 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/14/1979 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-79-067U, PNO-79-67U, NUDOCS 7904170309 | |
| Download: ML17272B046 (4) | |
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April'l4, 1979
..i PRELININRY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PiiO-79-67U!
I This reliminarv notification constitutes summar infomation of 'an event of safet or ublic interest si nificance.
The in=or,.ation resented is a
summer of information as o
7-'00 a.m.
on A ri~
1979.
Facility:
Three Nile Island Unit 2 Hidd'letenn, Pennsylvania (DN5D-520j
~Sub ect:
NUCLEAR INCIDENT AT THREE iiILE ISLAND Plant Status:
At 1003 on April 13, 1979, cooldown of the primary coolant system %as initiated marking the first step t'oward placi'ng the react'or into natural circulation, It is anticipated that the primary syst z would be cobled from 280 degrees F to approximately 280 degrees F during this phase!
As of 0200 on'pril 14, primary coolant temperature h=d decreased to approximately 250 degrees F and cooldown had slo~
d considerably.
Four of the incore thermocouple readings remained abov 300 degrees F with the
. highest at 350 degrees F.
A pressurized primary coolant sample was taken on April 13 and is being, sent to Idaho Falls, Idaho for analysis by Allied Chemical.
The samp'Ie left Harrisburg at 0400 on April 14 and estimated time of arrival at Idaho Falls is 0945 EST.
Environmental Status:
Offsite radiation leve'Is identified by HRC survey teams were consistent with normal background levels (0.02 mR/hr maximum).
The results were obtained fromi routine survey." performed on the east and. west sides of the Susquehanna River at distances up to'ive miles north and south of the site.
'y 11:15 a.m.
on April 13, 1979, 292 local residen s were scanned with the whole body counter. located in Hiddletown.
Scan results indicate no radiation levels above normal body levels.
The following Aerial Heasuring System surveys were conducted on April 13.
Hind speed ranged from 14 to 16 mph.
Ho defined plume was identified.
Time Max. Radiation Leve'l Distance from Site 0908 - 0940 0.03'mR/hr 1000 feet 1454 -, 1530 0.03 mR/hr 900 feet
!COHTIHUED IIV)EDIATE PREL ItiIHARY HOTIFICATIOH O~~gosog
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Apvfl 14, 1979 PHO-79-670 4l JL I'j.
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The l')RC took a. 24-hour air sample near the observation center starting at 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on April 12, 1979.
The results indicated less than 1,5 picocuries per cubic meter of iodine-131, The 10 CFR 20 'limit for iodine-'l31 is 100 picocuries per cubic meter.
Dose rates (47 locations,'as;measured by NRC thermoluminescent dositraters for the past 24-hour period of April 13 are near expected natural back-
'round levels.
L The State of tlaryland reported finding less than 6 picocuries of iodin'e per liter of'milk in 6 samples takeo during April =7 to April 1'i.
The milk samples were taken from farms around
.Tt'>I.
L Sixty-two EPA air samples collected on April 9 and 10, indicated no detectable activity, While six indicated activities which ranged from 0.092 to 0.8'i picocuries per',cubic meter of ~odine-131.
EPA samples of milk, soil, vegetation, water and various species of fish did not reveal any activity above background, Correction to PNO-79-67E dated March 31, 1979..
The initial report of licensee TLD data Has based on a telephone report.
The following is based on the TLD vendor's formal report.
The first quarter 1979 TLD readings ranged'from background to a high of 1044 mR at the licensee fence in the NOH sector.
The highest reading TLD located in an offsite populated area was about 26 mR of which about 15 mR was background exposure.
A TLD located midwLay across the north bridge about 0.3 miles HNE of the plant recorded 44 mR, including bacl'.ground.
These revised estimates do. not significantly affect previous estimates of population dgses
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I i CONTI'HUED IMMEDIATE PAELD'lliNARY'OTIFICATION
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Transmitted H St /c'.'r
'CCC d i Comnissioner Brad-ord Corani ss ioner Kennedy Commissioner Ahearne Cornnissioner Gilinsky P.
Bldg /cp:Zg H.
R. Denton, tiRR R.
C.
S.
- Birches, tt iSS S
- Levine, RES I
IE (THI) Site 4': 3
{Provide Copy to STATE)
White House Situat n
Room FDAA (Provide copies to the Administrator EPA DDE/HI&
PENA BPP (State o7 PA}
DCPA HEH (PlckUp}
Handcarry
{FAA)
$ t'LiREDIATE PRELIMINARY NOTIFICATION April 14, 1979 PING-?9-6?U S. 0.
Chal k, SECY C.
C.
Karrmerer, CA (For Distribution)
J.
G. Davis, IE Region I ~/as:
Region II ~cs m..r Region III~w:w~
Region IV HAIL)
. Cuamings, OIA R. t<inogue, SD.
and the Operations Center)
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