ML19220D027
| ML19220D027 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/02/1979 |
| From: | Lafleur J NRC OFFICE OF INTERNATIONAL PROGRAMS (OIP) |
| To: | INTERNATIONAL ATOMIC ENERGY AGENCY |
| References | |
| NUDOCS 7905160204 | |
| Download: ML19220D027 (3) | |
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SUBJECT:
THREE MILE ISLAND REACTOR STATUS
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REF:
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1 ADDRESSEES REQUESTED TO PASS FOLLOWING INFORMATION TO 0FFICIAL NRC CONTACTS IN HOST GOVERNMENTS AND TO VISITING
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SENIOR U.S. OFFICIALS, ASAP, DURING DAYLIGHT HOURS, AND TO
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USE AS APPROPRIATE IN ANSWERING INQUIRIES.
PLEASE NOTE THIS INFORMATION IS PRELIMINARY AND NOT FULLY EVALUATED.
2 PLANT STATUS AS OF MIDDAY APRIL 2 A.
REACTOR PRESSURE IS BEING HELD AT ABOUT 1000 PSI.
INCORE THERMOCOUPLES CONTINUE TO SHOU A DECREASE IN FUEL CHANNEL TEMPERATURES, WITH ALL MEASUREMENTS BELOW ABOUT 475 DEGREES F.
BULK CORE INLET AND OUTLET TEMPERATURES
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ARE 280 DEGREES F.
AT 11 P.M.,
APRIL 1, A CONTAINMENT AIR SAMPLE INDICATED 2 3% HYDROGEN.
B.
FURTHER ANALYSES AND CONSULTATIONS WITH EXPERTS HAS LED TO THE DEVELOPMENT OF A STRONG CONCENSUS THAT THE NET OXYGEN GENERATION RATE TEEAIA/& THE NONCONDENSIBLE BUBBLE IN THE REACTOR IS MUCH LESS THAN ORIGINALLY CONSERVATIVELY ESTIMATED.
ALSO MEASUREMENTS AT THE PLANT APPEAR TO INDICATE THAT THE VOLUME OF GASES WITHIN THE BUBBLE IS
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FURTHER DEVELOPMENTS ARE BEING CLOSELY FOLLOWED T& CONFIRM THESE FAVORABLE INDICA-TIONS.
3.
ACTION ON OTHER FACILITIES - THE THREE MILE ISLAND UNIT 2 {TMI-2} PRESSURIZED WATER REACTOR WAS SUPPLIED BY BABC0CK & WILCOX {B&W}.
ALL UTILITIES WITH'AN OPERATING B&W REACTOR WERE SENT AN NRC BULLETIN YESTERDAY TO PRO-VIDE THEM WITH INFORMATION ABOUT THE TMI-2 INCIDENT;'
REQUIRE A PROMPT REVIEW 0F THEIR PLANT CONDITIONS, AND TO EFFECT ACTION TO PREVENT SUCH AN INCIDENT.
NRC INSPECTORS ARE BEING SENT TO EACH LICENSED B&W REACTOR TO PROVIDE INCREASED INSPECTION COVERAGE.
ADDITIONAL REACTOR SHUTDOWNS OR POWER REDUCTIONS ARE NOT BEING REQUIRED BY THE NRC AT THIS TIME.
4.
ENVIRONMENTAL STATUS A.
THIRTY-SEVEN THERM 0 LUMINESCENT DOSIMETRY {TLD}
STATIONS WERE ESTABLISHED BY THE NRC AT DISTANCES FROM ADOUT ONE MILE TO ABOUT 12 MILES FROM THE PLANT.
MULTIPLE DOSIMETERS ARE PLACED AT EACH LOCATION - ONE WILL BE LEFT IN PLACE FOR A CUMULATIVE DOSE MEASUREMENT; ANOTHER IS RECOVERED & REPLACED EACH DAY.
TLD'S COLLECTED ON APRIL 1, 1979 INDICATED THE FOLLOWING DOSE RATES IN POPULATED AREAS:
LOCATION:
DOSE RATE {MILLIROENTGENS PER HOUR}:
MIDDLETOWN O.044 GOLDSBORO 0 13 GOLDSBORO 0 040 LEWISBERRY 0 053 PLEASANT GRDVE 0 041 YORK HAVEN 0 074 CONEUAGO FALLS 0 044 EMIGSVILLE 0 053 B.
THE HIGHEST DOSIMETER READING WAS RECORDED AT A LOCATION HALF MILE ENE OF THE PLANT.
THE AVERAGE DOSE RATE AT THIS LOCATION WAS 1 1 MILLIROENTGEN PER HOUR.
C.
FOR COMPARISON PURPOSES, THE LICENSEE'S ENVIRONNENTAL REPORT FOR 1977 WHEN ONE UNIT WAS OPERATING, INDICATED THAT THE AVERAGE DOSE RATE AT OFFSITE STATIONS LOCATED WITHIN THREE MILES OF THE PLANT WAS 0 007 MR/HR.
D.
CALCULATIONS USING THE TLD DATA INDICATE A POPULATION DOSE OF APPROXIMATELY 200 MAN-RENS FOR THE 24-HOUR PERIOD.
THIS MEANS THERE WAS AN AVERAGE RADIATION DOSE OF ABOUT U 3 MILLIRENS PER PERSON IN THE POPULATION WITHIN A 20.1ILE RADIUS OF THE PLANT.
E.
SURVEY FLIGHTS WERE CONTINUED AT THREE-HOUR INTERVALS ON APRIL 1, AND 2.
THE PLUME READINGS WERE ESSENTIALLY THE SAME FOR ALL THE FLIGHTS.
DIRECTION OF THE PLUME UNCLASSIFIED
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2 VARIED FROM 55~T0'W55.~ THE bAXIMb'b~ LEVEL AT ONE MILE
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FROM THE PLANT WAS ABOUT 3 MR/HR AT AN ALTITUTDE OF 500 FEET.
AT THREE MILES, THE LEVELS WERE FROM 0 1 TO 0 5 MR/HR.
F.
OFFSITE GROUND LEVEL SURVEYS TAKEN BETUEEN 11:00 A.M.
APRIL 1, AND 4:30 A.M. APRILv2, ON BOTH SIDES OF THE RIVER IN A SOUTHERLY DIRECTION GENERALLY SHOUED LEVELS OF 0 01 TO 0 04 MR/HR.
G.
NINE MILK SAMPLES COLLECTED AND ANALYZED BY THE STATE OF PENNSYLVANIA ON APF,IL 1 SHOWED NO DETECTABLE RADIO-I0 DINE.
H.
THE LICENSEE REPORTED RESULTS FROM 5 MILK SAMPLES TAKEN FROM FOUR LOCATIONS AROUND THE PLANT COLLECTED THE EVENING OF MARCH 30, 1979 THE SAMPLES INCLUDED ONE SAMPLE OF GOAT'S MILK AND FOUR SAMPLES OF COW'S MILK.
THE HIGHEST LEVEL WAS EEPORTED FOR THE GOAT'S MILK AND UAS 41 PIC0 CURIES PER LITER {PCI/1.}.
THE HIGHEST LEVEL IN COU'S MILK UAS 8 4 PCI/1 THE NRC HAS ESTIMATED THE THYROID DOSE TO A CHILD DRINKING MILK WITH CONCENTRATIONS OF RADI0 IODINE AT 41 PCI/1 TO BE ABOUT 0 2 MILLIREM PER DAY.
EACH OF THESE SAMPLES INDICATED LEVELS SLIGHTLY ABOVE NORMAL BACKGROUND LEVEL.S FOR RADI0 IODINE.
I.
THE BUREAU OF RADIOLOGICAL HEALTH, HEUs ALSO REPORTED IDENTIFYING RADI0 IODINE IN IIX SAMPLES OF MILK COLLECTED ON MARCH 31, 1979 FROM FOUR LOCATIONS AROUND THE PLANT.
ANALYSES OF THE SAMPLES IDENTIFIED NEAR BACKGROUND LEVELS OF RADI0 IODINE.
THE LEVELS RANGED FROM THE MINIMUM DETECTABLE LIMIT TO ABOUT 40 PCI/L.
J.
FOR COMPARISON, THE LICENSEE'S ENVIRONMENTAL REPORT FOR 1977 SHOWED OBSERVATIONS OF 0 74 TO 31 PCI/1 0F I-131 IN MILK THROUGHOUT THE YEAR PREVIOUS TO THE INCIDENT.
AT 12,000 PCI/1, THE U.S. DEPARTMENT OF HEALTH, EDUCATION, AND UELFARE RECOMMENDS PLACING DAIRY HERDS ON STORED FEED.
LOCAL HERDS ARE ALREADY ON STORED FEED. YY
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