ML19220D005
| ML19220D005 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 03/31/1979 |
| From: | Lafleur J NRC OFFICE OF INTERNATIONAL PROGRAMS (OIP) |
| To: | INTERNATIONAL ATOMIC ENERGY AGENCY |
| References | |
| NUDOCS 7905160165 | |
| Download: ML19220D005 (5) | |
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.'. SU5 J E CT : THREE MILE ISLAND REACTOR STATUS
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SUMMARY
AS OF MORNING MARCH 31, REACTOR CONDITIONS
-REMAIN STABLE, UITH TEMPERATURES GOING DOUN SLOULY.
- NO DECISION HAS YET BEEN MADE ON THE METHOD OF ATTAINING
- FINAL LOW PRESSURE SHUTDOUN CONDITION.
PRESENT STATUS MAY
.;8E NAINTAINED SEVERAL DAYS.
OFF-SITE R ADI ATION LEVELS, rMEASURED AT A MAXIMUM OF ASOUT 20 MR/HR FOLLOUING EARLIER
.' INTERMITTENT RELEASES, HAVE DROPPED CONSIDERASLY.
END OF i
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SUMMARY
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i
.2 PLANT STATUS AS OF MARCH 30 I
.A.
GASEOUS RADICACTIVITV FROM THE PRIMARY COOLANT SYSTEM
.LETDOUN HAS BEEN CONTAINED IN UASTE GAS DECAY TANKS SINCE
- THE LAST GASEOUS RELEASE AT APPROXINATELY 2
- 30 P.M.
MARCH 30, 1979 AT THE PRESENT REACTOR COOLANT LETDOUN RATE OF
'APPROXIMATELY 20 GPM IT MAY SE NECESSARY TO MAKE A PLANNED RELEASE OF RADI0 ACTIVE GAS TOMORROU TO PREVENT GAS DECAY
" TANK RELIEF VALVE OPERATION AT ITS SETPOINT OF 100 PSI.
'THE LICENSEE HAS INSTALLED A TENPORARY LINE FROM THE GA"
- DECAY SYSTEM BACK TO REACTOR CONTAINMENTUHICHISUNDER}jC) j []
EVALUATION BEFot'E SEING PLACED IN OPERATION.
CONTAINMEN l
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PRESSURE IS BEING MAINTAINED SLIGHTLY NEGATIVE {-1 PSI}-
AS A RESULT OF FAN COOLER OPERATION.
8 REACTOR COOLANT TEMPERATURES MEASURED AT FIFTY-TUO
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LOCATIONS AT THE OUTLET OF THE CORE HAVE CONTINUED 70 COME DOWN SLOULY.
THREE OF THESE OUTLET TEMPERATURE INSTRUMENTS CONTINUE TO INDICATE ABOVE SATURATION TEMPERATURE.
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i C.
THE NRC STAFF WAS INFORMED BY THE LICENSEE ON FRIDAY MORNING THAT EXAMINATION OF CONTAINMENT PRESSURE DATA FOR dARCH E6 INDICATES A PRESSURE SPIKE UP TO APPROXIMATE-LY 30 PSI OCCURRED Af APPROXIMATELY 1:50 P.M.
NRC PERSONNEL ARE EVALUATING THE POSSIBILITY THAT A HYDROGEN
{ CHEMICAL} EXPLOSION MAS THE CAUSE OF THE CONTAINMENT INTERNAL PRESSURE SPIKE.
D.
THE REACTOR COOLANT PATH IS THROUGH ONE REACTOR COOLANT PUMP AND ONE STEAM GENERATOR.
THE STEAM GENERATOR IS SEING FED BY AN AUXILIARY FEEDFUMP.
SEVERAL OPTIONS FOR DEPRESSURIZING THE' REACTOR AND CONTINUING C00LD00N VIA THE RESIDUAL HEAT REMOVAL SYSTEM ARE UNDER CONSIDERATION.
E.
THE VOLUME OF NON-CONDENSISLE GASES IN THE REACTOR VESSEL HAS SEEN ESTIMATED TO BE APPRSXIMATELY 1000 TO 1500 CUBIC FEET AT 1000 PSI.
THIS VOLUME IS ESTIMATED TO RESULT IN A UATER LEVEL OF SEVERAL FEET OVER THE TOP OF THE FUEL.
THE RATE OF GROUTH OF THE SUS 9LE IN THE REACTOR VESSEL IS ESTINATED TO SE LESS THAN 50 CUSIC 5
FEET PER DAY AT 1000 PSI.
3 THE DIRECTOR OF THE OFFICE OF NUCLEAR REACTOR REGULA-TION, THE DIRECTOR OF THE REGION I 0FFICE OF INSPECTION AND ENFORCEMENT AND THE DIRECTOR OF THE DIVISION OF OPERATING REACTORS ARRIVED AT THE SITE AT APPROXIMATELY 2 P.N. MARCH 30, TO DIRECT NRC ACTIVITIES AT THE SITE AND SITE VICINITY.
REPRESENAITATIVES OF HEU AND EPA ARE PROVIDING COORDINATION AND ASSISTANCE TO THE NRC AT THE INCIDENT RESPONS_E CENTER.
4.
ENVIRONMENTAL STATUS AS OF MARCH 30 g
A.
AT APPROXIMATELY 3 P.M. ON MARCH 30,,.1979, NRC ANALY- ~[
j SIS OF EIGHT VEGETATION SAM,PLES FROM THE OFFSITE AREAS SHOWED No DETECTABLE ACTIVITY.
AT 5:30 P.M. THE PENNSYL-VANIA STATE RADIATION HEALTH DEPARTMENT REPORTED THAT ENVIRONMENTAL UATER AND AIR SAMPLES COLLECTED IN THE VICINITY OF THE THREE NILE ISLAND PLANT SHOUED NO DETECTABLE ACTIVITY EXCEPT FOR SOME XENON-133 *ND XENON-135, MILK SAMPLE ANALYSIS SHOWED NO ACTIVITY LEVELS A30VE BACKGROUND.
9 OFFSITE GROUND LEVEL GAMMA SURVEYS IN THE MIDDLETOUN AND GOLDS 50R0 AREAS SETUEEN 2:00 AND 6:00 P.M.
ON MARCH 30, RANGED FROM 01 TO 1 NILLIROENTGENS PER HOUR.
AN AERIAL
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SURVEY UAS'MADE BY HELICOPTER FROM 4: 00 - 6:00 P.M. ON, i
MARCH 30, THE SITE UAS SURVEYED IN C06.' CENTRIC CIRCLES AT APPROXIMATELY ONE MILE INTERVALS AND AT A HEIGHT OF 300 TO 1,000 FEET.
THE HIGHEST RADIATION READINGS UERE OVER THE SITE AND MEASURED'.a 70 10 MILLIROENTGENS PER HOUR. __ ' THE PLUME FOLLOUED THE RIVER IN A NORTHUESTERLY -
j DIRECTION'AND UAS NOT DETECTABLE BEYOND FIVE TO SIX MILES FROM THE SITE.
SITE GROUND LEVEL SURVEYS CON-DUCTED BETWEEN 7:30 - 6:00 P.M. RANGED FROM 01 TO 1 8 MILLIROENTGENS PER HOUR.
C.
AT 4:00 P.M. MARCH 30, UPPER LEVEL UINDS UERE FROM THE SOUTHEAST.
FORECAST INDICATED PRECIPITATION IN THE FORM OF THUNDERSTORMS MOVING IN AFTER 12 MIDNIGHT $
MARCH 30 AT 5:00 P.M. UINDS ONSI1E AT THREE MILE ISLAND UERE REPORTED AT 2 TO 3 NILES PER HOUR GENERALLY FROM EAST To UEST.
5.
PLANT STATUS AS OF MORNING OF MARCH 31 A.
REACTOR COOLING CONTINUES USING THE LA MAIN REACTOR COOLANT PUMP UITH STEAM GENERATOR A STEAMING TO THE MAIN CONDENSER.
CHANGES TO THIS COOLING METHOD ARE NOT PLANNED FOR THE NEAR TE.NN.
AN OPERABILITY STATUS OF EQUIPMENT IS BEING COMPILED FOR USE AS BACKUP IN THE EVENT OF FA LURE OF EXISTING OPERATING EQUIPMENT.
S.
THE HYDROGEN REconSINER IS IN AN OPERASLE STATUS; HOWEVER, SHIELDING OF ITS PIPING AND COMPONENTS IS NOT FULLY INSTALLED AND IS PRESENTLY CONS!DERE3 INADEQUATE.
LEAD FOR SHIELDING HAS SEEN LOCATED AND UILL BE MOVED TO THE SITE ON AN EXPEDITED BASIS.
CALCULATIONS OF HYDROGEN IN CONTAINMENT SHOU THAT THE PRESENT CONCENTRA-TION IS LESS THAN 97.3 THE STAFF'S LIMIT ON ALLOWED CON-CENTRATION TO ENSURE AN EXPLOSIVE MIXTURE IS NOT OSTAINED.
ATTEMPTS ARE SEING MADE TO OSTAIN A CONTAINMENT ATMOS-PHERE SAMPLE.
C.
THE WASTE GAS DECAY TANK PRESSURES UERE 80 PSI AT 10:15 P.M.
ON MARCH 30 AND HAD SEEN RELATIVELY CONSTANT FOR ABOUT FIVE HOURS.
THE TANK IS SET TO RELIEVE PRESSURE AT 100 - 110 PSI.
THE RADIATION FIELD {60 R/HR AT CONTACT} PREVENTS RESETTING RELIEF POINTS.
D.
REACTOR COOLANT TEMPERATURES MEASURED BY INCORE THERMOCOUPLES AT 32 LOCATIONS PRESENTLY SHOW ONLY ONE LOCATION ABOVE SATURATION TEMPERATURE.
TEMPERATURES IN THE CORE AS MEASURED FROM OUTLET THERMOCOUPLES ARE GRADUALLY DECREASING.
OTHER SYSTEM PARAMETERS ARE t
REMAINING STABLE.
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b.
ENVIRONMENTAL STATUS AS OF MORNING MARCH 31 A.
THREE SURVEY FLIGHTS OF ONE-HOUR LENGTH UERE CON-DUCTED SEGINNING AT 9:30 P.M. ON MARCH 3G, AND AT MIDNIGHT t_'9 180 UNCLASSIFI_D
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4V-AND 3:00 A.M. ON MARCH 31 AT A DISTANCE OF ONE MILE FROM THE PLANT, MAXIMUN -READINGS RANGED FROM 0 5 MILLI-ROENTGENS PER HOUR {MR/HR} TO 1 5 MR/HR.
AT THE la MILE POINT, READINGS OF 01 To C,.2 MR/HR UERE OSTAINED DURING THE TWO EARLIER SURVEYS AND D.3 f1R/HR DURING THE LATEST.
FLIGHTS ARE SEING MADE AT APPROXIMATELY THREE HOUR i
INTERVALS.
B.
OFFSITE GROUND LEVEL GAMMA SURVEYS IN THE MIDDLETOUN AREA AND NORTH, BETUEEN 9:30 P.M. ON MARCH 30 AND 1:00 AN ON MARCH 31, INDICATED LEVELS FROM 0 2 TO U 5 MR/HR.
THESE MEASUREMENTS UERE TAKEN IN THE GENERA.L DIRECTION OF.
THE PLUME MEASURED IN AERIAL SURVEYS.
C.
AT 3:00 P.M.
ON NARCH 29, { PRIOR TO THE RELEASES OF MARCH 30} THE LICENSEE RECOVERED THERM 0 LUMINESCENT DOSIMETERS FROM 17 FIXED POSITIONS LOCATED UITHIN A 15 MILE RADIUS OF THE SITE.
THE DOSIMETERS HAD SEEN IN PLACE FOR THREE MONTHS AND HAD SEEN EXPOSD FOR ASOUT 33 HOURS AFTER THE INCIDENT.
ONLY TUO DOSIMETERS SHOWED ELEVATED EXPOSURES ABOVE NORMAL LEVELS.
THE HIGHEST READING OSSERVED UAS ON THREE MILE ISLAND, 0 4 MILES NORTH OF THE REACTOR AT THE NORTH UEATHER STATION.
AT THIS LOCATION, THE GUARTERLY ACCUMULATD EXPOSURE UAS 61 nr,,
APPROXIMATELY 63 MR A30VE THE NORMAL GUARTERLY EXPOSURE RATE.
THE OTHER HIGH EXPOSURE WAS OESERVED AT NORTH SRIDGE, 0 7 MILES NNE OF THE REACTOR AT THE ENTRANCE TO THE SITE.
AT THIS LOCATION, THE TOTAL GUARTERLY ACCUMU-LATED EXPOSURE UAI 37 MR OR APPROXINATELY 23 MR ABOVE THE NORMAL GUARTERLY EXPOSURE RATE.
D.
DURING THE EVENING MILKING HOURS ON MARCH 3G, MILK.
SAMPLES UERE COLLECTED BY THE PENNSYLVANIA DEPARTMENT OF ENVIRONMEWAL RESOURCES AT THE FOLLOUING LOCATIONS:
HARRISBURG {2 SITES}, YORK, MIDDLETOUN, SAINERIDGE, ETTERS.
ANALYSES SHOUED NO DETECTABLE R ADI0 IODINE.
THE COUS HAD SEEN FED ON STORED FED SUT HAD BEEN OUTSIDE FOR EXERCISE.
E.
THE PENNSYLVANIA DEPARTNENT OF ENVIRONMENTAL RESOURCES ALSO COLLECTED UATER SAMPLES AT FILTRATION PLANTS AT COLUMBIA, PA {FOR THE CITY OF LANCASTER} AND URIGHTIVILLE ON MARCH 30 IN THE MORNING AND EARLY AFTERNOON.
BOTH SAMPLE POINTS ARE DOUNSTREAN OF THREE MILE ISLAND.
NO i
DETECTABLE ACTIVITY WAS FOUND.
7.
ADDRESSEES REGUESTED TO NOTIFY NRC OFFICIAL CONTACTS IN HOST GOVERNMENTS GEF.A-023'J AND DOE AS~ISTANT SECRETARY EIRGOLD ASAP DURING DAYLIGHT HOURS, AND USE AS APPROPRIATE IN ANSUERING INGUIRIES.
S.
NOTE INFORMATION IS PRELIMINARY AND NOT FULLY EVALUATO.
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