ML19220D013

Summary of Info Re Nuclear Incident as of 790403.Reactor Pressure Remains Near 1,000 Psi W/Bulk Core Coolant Inlet & Outlet Temperatures at 280 F

ML19220D013
Person / Time
Site:	Crane
Issue date:	04/03/1979
From:	Lafleur J NRC OFFICE OF INTERNATIONAL PROGRAMS (OIP)
To:	INTERNATIONAL ATOMIC ENERGY AGENCY
References
NUDOCS 7905160178
Download: ML19220D013 (3)

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ATHENS,' BERN'IMMEDIATE, BOMBAY IMMEDIATE, BONN IMME-DIATE, BRASILIA IMMEDIATE, BRUSSELS IMMEDIATE, COPENHAGEN IMMEDIATE,I USIAEA, USOECD, USEEC -

PASS TO PARA 1 PARTIES ASAP E.O. 11b52:

N/A TAGS: TECH

SUBJECT:

THREE MILE ISLAND REACTOR STATUS REF: A-0221 1

ADDRESSEES REQUESTED TO PASS FOLLOUING INFORMATICN TO OFFICIAL NRC CONTACTS IN HOST GOVERNMENTS.AND TO VISITING SENIOR U.'S. OFFICIALS, ASAP, DURING DAYLIGHT HOURS, AND TO USE AS APPROPRIATE IN ANSUERING INQUIRIES.

PLEASE NOT THIS INFORMATION IS PRELIMINARY AND NOT FULLY EVALUATED.

2.

PLANT STATUS AS OF 7 A.M. APRIL 3 A.

REACTOR PRESSURE REMAINS NEAR 1000 PSI, MITH BULX CORE COOLANT INLET AND OUTLET TEMPERATURES AT 260 F.

CORE THERMOCOUPLE READINGS ARE RELATIVELY UNCHANGED AND INDICATE A MAXIMUM TEMPERATURE OF 477 F UHICH IS UELL BELOU SATURATION TEMPERATURE FOR THIS PRESSURE.

{0NLY 3 THERMO-COUPLES READ ABOVE 400 F}.

THE GAS BUBBLE STILL APPEARS TO BE PRESENT AT A MUCH REDUCED VOLUME, UITH BUBBLE SIZE CALCULATIONS STILL BEING EVALUATED.

DEGASIFICATION CON-TINUES.

CONTAINMENT ATMOSPHERE MEASUREMENTS INDICATE ABOUT 1 9 PERCENT HYDROGEN.

ONE HYDR 0 GEN RECOMBINER IS OPERATING, AND A 12 DAY TIME PERIOD IS PROJECTED FOR 7905160178 i f REDUCTION OF THE HYDROGEN CONCENTRATION TO ABOUT 17..

B.

PLANS TO USE A ROBOT DEVICE TO OBTAIN A PRIMARY C00LANT

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ENVIRONMENTAL STATUS A.

NO SURVEILLANCE FLITHS HAVE BEEN CONDUCTED SINCE 6:00 AM ON APRIL 2 BECAUSE OF UE'THER.

ALL OFFSITE GROUND SURVEYS INDICATE ABOUT IG02 MILLREN/ HOUR, EXCEPT FOR A BRIEF PERIOD DURING PERIODIC VENTING 0F THE PRIMARY SYSTEM MAKEUP TANK TO THE VENT HEADER.

DURING THIF VENTING, AN OFFSITE TEAM DETECTED A BRIEF, DOWNUIND 1 5 MILLIROENTGEN / HOUR GROUND LEVEL DOSE RATE UITH A RAPID RETURN TO 0 02 MR/ HOUR.

THIS LEVEL IS LESS THAN OTHERS REPORTED PREVIOUSLY FOR SIMILAR OPERATION ACTIVITIES.

B.

DOSE RATES IN POPULATED AREAS AS MEASURED BY NRC THERM 0 LUMINESCENT DOSIMETERS {TLD} SHOWED A SIGNIFICANT DECREASE FROM THE PREVIOUS DAY.

C.

ON APRIL 2, THE FOOD AND DRUG ADMINISTRATION REPORTED CONCENTRATIONS OF RADI0 IODINE IN EIGHT MILK SAMPLES.

THE RESULTS RANGED FROM 10 PIC0 CURIES PER LITER {THE MINIMUN DETECTABLE ACTIVITY} TO 20 + 10 PIC0 CURIES PER LITER.

D.

SINCE MARCH 30, THERE HAVE BEEN CONTROLLED RELEASES OF SEVERAL HUNDRED THOUSAND GALLONS OF WATER FROM THE INDUSTRIAL UASTE TANK TO THE SUSQUEHANNA RIVER.

THE EFFLUENTS CONTAIN RADI0 IODINE.

ON APRIL 2, THE FDA REPORTED THAT A SAMPLE OF RIVER WATER COLLECTED TUO MILES FROM THE PLANT UAS ANALYZED AND FOUND TO CONTAIN 3.9 X 10

-8 MICR0 CURIES PER.. LLILITER OF IODINE-131, OR ABOUT 13% OF MAXIMUM PERMISSIBLE CONCENTRATION {MPC}.

3 OTHER INFORMATION LOU EXPOSURES IN THE CONTROL ROOM AND IN OTHER SITES AROUND THE PLANT CONTINUED TO DECREASE SIGNIFICANTLY AS DID RADIOACTIVITY CONCENTRATIONS IN THE CONTAINMENT BUILDING.

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ACTION PRECEDENCC CONTINUED:

IMMEDIATE HELSINKI IMMEDIATE LONDON IMMEDIATE MADRID IMMEDIATE MANILA IMMEDIATE MEXIC0 CITY T

IMMEDIATE NEU DELHI T

IMMEDIATE PARIS IMMEDIATE RIO DE JANEIRO IMMEDIATE ROME IMMEDIATE SEOUL IMMEDIATE STOCKHOLM IMMEDIATE BUENOS AIRES IMMEDIATE TEHRAN IMMEDIATE TEL-AVIV IMMEDIATE THE. HAGUE IMMEDIATE TOKYO IMMEDIATE VIENNA 119 197

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