ML19220C999

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Suppl Info Re TMI Emergency Situation for Dispatch Abroad
ML19220C999
Person / Time
Site: Crane 
Issue date: 03/29/1979
From: Lafleur J
NRC OFFICE OF INTERNATIONAL PROGRAMS (OIP)
To:
INTERNATIONAL ATOMIC ENERGY AGENCY
References
NUDOCS 7905160156
Download: ML19220C999 (4)
v • d • e


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SUBJECT:

NUCLEAR POWER PLANT ENER'ENCY SITUATION g.j

REFERENCE:

STATE 77697, STATE 78113 b

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'1 THE FOLLOUING IS SUPPLEMENTAL INFORMATION ON THE THREE

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' MILE ISLAND INCIDENT.

PLEASE NOTIFY NRC OFFICIAL CONTACTS r-

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IN HOST GOVERNMENTS AND PARIS PASS TO DOE ASST. SECRETARY

BERGOLD, AT GPENING OF BUSINESS FRIDAY, AND USE, AS 7

jAPPROPRIATE, IN ANSUERING INQUIRIES.

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i2 THE LICENSEE, METROPOLITAN EDISON COMPANY, NOTIFIED THE d

NRC REGIONAL OFFICE AT APP.00XIMATELY 7
45 A.M.

ON MARCH 28 l0F AN INCIDENT AT THREE MILE ISLAND UNIT 2 UHICH OCCURRED

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[AT APPROXIMATELY 4:00 A.M. AT 987. POUER UHEN THE FEED PUMPS PIl

TRIPPED DUE TO A FEEDUATER SYSTEM PROBLEM.

THIS RESULTED M

".IN A TURBINE TRIP AND SUBSEQUENT REACTOR SCRAM DUE TO HIGH d[3

-REACTOR COOLANT PRESSURE.

A COMBINATION OF FEED PUMP

.0PERATION AND THE OPENING OF THE RELIEF VALVES ON THE y

PRESSURIZER AND THE STEAM GENERAT0fs CAUSED A REACTOR COOLANT,,u SYSTEM {RCS} C00LDOWN.

AT 1600 POUNDS PER SQUARE INCH

.y.1 PRESSURE {PSIG}, ECCS UATER INJECTION OCCURRED AUTOMATICALLY

.ALL ECCS COMPONENTS STARTED AND OPERATED PROPERLY.

UATER LEVEL INCREASED IN THE PRESSURIZER, AND ECCS INJECTION UAS i 'l 4 UNCLASSIFIED

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g, MANUALLY SHUT DOUN APPR0XIMATELY 5 MINUTES AFTER ACTUATION (6; UERESHUTDOWN'UHENLOUJE,TPOSITIVE-SUCTIONHEADLIMITS:.p i '--

IT-UAS SUBSEQUENTLY RESUMED.

THE. REACTOR COOLANT P. UMPS _

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HIGH-ACTIVITY WAS NOTED IN THE g

I EM REACTOR COOLANT SYSTEM SAMPLE LINES {APPR0XIMATELY 600 MR/HR CONTACT READINGS}.

A SITE EMERGENCY WAS THEN AT APPR0XIMATELY 7:30 A.M.,

A GENERAL EMERGENCY k' DECLARED..

fWASDECLAREDBASEDONHIGHRADIATIONLEVELSINTHEREACTORFM i BUILDING.

AT 8:30 A.M. SITE BOUNDARY RADIATION LEVELS Fj jUERE REPORTED TO NOT BE SIGNIFICANT {LESS GHtt THAN

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1 MR/HR}.

THE SOURCE OF ACTIVITY UAS STATED TO BE FAILED P'i

!4 THE REGION'I" INCIDENT RESPONSE CENTER WAS ACTIVATED

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AT 6:10 A.M.,

AND DIRECT COMMUNICATIONS WITH THE LICENSEE :

,AND NRC HEADQUARTERS UERE ESTABLISHED.

THE RESPONSE TEAM i UAS DISPATCHED AT 8:45 A.M.

AND ARRIVED AT THE SITE AT i-10:05 A.M.

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.5 AT 10:45 A.M.

THE REACTOR COOLANT SYSTEM PRESSURE UAS BEING HELD AT 1950 PSIG UITH TEMPERATURE AT 220 DEGREES F.

IN THE COLD LEG.

BY 10:45 A.M.,

RADIATION LEVELS OF 3 MR/HR HAD BEEN DETECTED 500 YARDS OFFSITE.

6 AS OF 3:30 P.M.,

THE PLANT WAS BEING SLOULY COOLED DOUN UITH REACTOR COOLANT SYSTEM {RCS} PRESSURE AT 450 PSI, USING NORMAL LETDOUN AND MAKEUP FLOU PATHS.

A STEAM BUBBLE HAD BEEN COLLAPSED IN ONE OF THE REACTOR COOLANT LOOP HOT LEGS, AND SOME NATURAL CIRCULATION COOLING HAD BEEN ESTABLISHED.

PRESSURIZER LEVEL HAD BEEN DECREASED TO THE HIGH n'ANGE OF VISIBLE INPICATION, AND SOME PRESSURIZER

, HEATERS UERE IN OPERATION.

THE SECONDARY PLANT WAS GEING j ALIGNED TO DRAW A VACUUM IN THE MAIN CONDENSER AND TO USE l_.

[ONEOFTHESTEAMGENERATORSFORHEATREMOVAL.

[7 AS OF 3:30 P.M.,

A PLUME APPROXIMATELY 1/2 MILE UIDE

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?AND READING GENERALLY 1 MR/HR WAS MOVING TO THE NORTH OF p-THE PLANT.

THE AIRBORNE RADIOLOGICAL MONITORING TEAM r

t HELICOPTER WAS BEING USED TO DEFINE THE LENGTH OF THE F

PLUME.

AIRBORNE IODINE LEVELS OF UP TO 1 X 10-8 UCI/ML

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j UERE DETECTED IN MIDDLETOUN, PENNSYLVANIA, UHICH IS LOCATED NORTH OF THE SITE.

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b UNCLASSIFIED

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(Q 8-RADIATION LEVELS OUTSIDE..THE PLANT HAVE OCCURRED DUE

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TO VENTING-OF LOW-LEVEL. RADIOACTIVE GASES FROM THE l

'AUXILIAR_Y.: BUILDINGS THROUGH THE FILTERED PLANT VENTILATION $.,

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.9.,.IT IS-CONSERVATIVELY ESTIMATED THAT THE COLLECTIVE DOSEA TO THE LOCAL POPULATION FROM THE INCIDENT S0 FAR HAS BEEN Q I

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OF~THE ORDER OF ONE PERCENT OF THE ANNUAL DOSE DUE TO

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NATU.! AL BACKGROUND.

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10 TESTS OF ONE SAMPLE OF MILK FROM COUS UITHIN THE p

I PATH OF THE LOU-LEVEL RADI0 ACTIVE PLUME APPEAR To INDICATE...'

' THE PRESENCE OF RADIOACTIVE IODINE IN THE MILK, ALTHOUGH Ll 6- ~

HUNDREDS OF TIMES LOUER THAN THE LEVEL REQUIRING I

! ANY EMERGENCY HEALTH PROTECTION MEASURES TO BE TAKEN.

l lTHESETESTSARECURRENTLYBEINGVERIFIED.

t I 11 MEASUREMENTS INDICATE SOME REACTOR FUEL PROBABLY HAS ' '

g FAILED.

A VERY ROUGH CALCULATION INDICATES ABOUT 1 PER-i CENT OF THE FUEL ELEMENTS ARE PROBABLY LEAKING.

12 AS OF ABOUT NOON. MARCH 29, THE ECCS SYSTEM HAD BEEN ~

SHUT DOUN AND DECAY HEAT WAS BEING REMOVED THROUGH ONE OF l

THE STEAM GENERATORS.

C00LDOUN IS DELIBERATELY SLOU TO AVOID DAMAGE TO EQUIPMENT.

RADI0 ACTIVE UATER UHICH HAD BEEN EXPOSED TO THE ATMOSPHERE WITHIN AN AUXILIARY

, BUILDING HAS BEEN PUMPED INTO A CLOSED TANK.

THIS UAS EXPECTED TO REDUCE THE OFFSITE DOSES EMANATING FROM THE PLANT VENTILLATION SYSTEM.

SURVEYS TO CONFIRM THIS i

REDUCTION UERE BEING CONDUCTED.

I g 13 PLEASE NOTE THAT THE ABOVE IS PRELIMINARY INFORMATION.

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UNCLASSIFIED 4

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ACTION PRECEDENCE CONTINUED:

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IMMEDIATE HELSINKI IMMEDIATE LONDON IMMEDIATE MADRID IMMEDIATE. MANILA g

IMMEDIATE MEXICO CITY IMMEDIATE NEW DELHI IMMEDIATE PARIS IMMEDIATE RIO DE JANEIRO IMMEDIATE ROME IMMEDIATE SEOUL IMMEDIATE STOCKHOLH IMMEDIAli TEHRAN IMMEDIATE TEL-AVIV IMMEDIATE THE HAGUE IMMEDIATE TOKYO IMMEDIATE VIENNA

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