Text

Drafts of PNO 79-67 & Suppls Through 790604 (Suppl AR)
	ML20136A867
Person / Time
Site:	Crane
Issue date:	06/04/1979
From:	; NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:	;
References
	PNO-79-067-DRFT, PNO-79-67-DRFT, NUDOCS 7907120637
	Download: ML20136A867 (84)
	v • d • e

{{#Wiki_filter:.. 50-320 Draft of Preliminary Notifications i i 7907 /aoroS7

FORWARDED TO: KLfNGLER n Facility: Three Mile Islandzunit 2 4-Middletown, Pennsylvania (Docket No. 50-320)

Subject:

NUCLEAR INCIDENT AT THREE MILE ISLAND'- UNIT 2 The licensee notifie@gion I atz pproximately 7:45 AM of an incident at TMI-2 which occurred at approxima ely 4:00 AM at 98", power when the secondary feed pumps tripped due to a feedwater polishing system problem. This resulted inza turbine tr.ip and subsequent reactor trip on High Reactor Coolant Pres-y i sure. A combination of. Feed Pump Operation and Pressurizer Relief - Steam Generator relief valve operation caused an RCS cooldown. At 1600 psig, Emergency Safeguards Actuation occurred. All ECCS components started and operated properly. Water level increased in the Pressurizer and Safety Injection was secured manually approximately 5 minutes after actuation. It 4 was subseptiv mumed. The Reactor Coolant Pumps were secured when low j net positive suction head limits were approached. 1 , About.7:00 AM, high activ ty was noted in the RCS Coolant Sample Lines (approximately~ 600 mr/h z ' ntact readings). A Site Emergency was then declared. At approximately 7:30 AM, a General Emergency was declared based on High Radiation icvels in the Reactor Building. At 8:30 AM site boundary radiation levels were reporte6to not be significant (less than 1 mr/hr). The source of activity was stattfd to be failed fuel as a result of the transient, and due to a known previous primary to secondary leak in Steam Generator B. } Tho' Region RI Incident Response Center was activated at 8:10 AM and direct communications with the licensee and IE: Headquarters was estab-lished. The Response Team was dispatched at 8:45 AM and arrived at.the y site at 10:05 AM. At 10:45 AM the Reactor CooMnt System Pressure was being held at 1950 psig with temperature at 230"r in the cold leg. By 10:45 AM, Iodine-131 levels as high as 1.25 E-8 uo/ml and radiation levels of 3 mr/hr had been detected offsite. There is significant media interest at the present time because of concern about potential offsite radiation / contamination. The Commonwealth of Pennsylvania and EPA have been informed. Press contacts are being 3 made by the licensee and NRC.

Contact:

D. Haverkamo 5254 R. Keimio 5252 E. Brunner 5440 Prepared Dy Ext. Section Cnief Ext. Branch Chief Ext. Distribution: Dudley Thompson, Executive Officer for Operations Support, HQ l N. C. Moseley, Dirsctor, Division of Reactor Operations Inspection, HQ i G. Klingler, PN Coordinator e " " ~9-6N-emam44 Received via CMC DLM 3/28/79 11:45 a.m. b =w.; m

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t FORWARDED FOR ACTION: G. Klingler Facility: Three Mile Islandzunit 2 3 Middletown,Pennsylvanfaz{DN50-320) v

Subject:

NUCLEAR INCIDENT AT THREE MILE ISLAND - UNIT 2 F As of 3:30 p.m., the plant is being slowly cooled down with RCS pressure at 450 psi, using normal letdown and makeup flow paths. The bubble has s r... been collapsed in the A RC Loop hot leg, and some natural circulation

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cooling has been established. Pressurizer level has been decreased to i

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the high range of visible indication, and some heaters are in operation. [r=~"" The secondary plant is being aligned to draw a vacuum in the main condenser n and use the A Steam Generator for heat removal. The facility plans to continue a slow (3oF/hr) cooldown, until the Decay Heat Removal System can be placed in operation at 350 psi RCS pressure, 3500F RCS temperature in 15-18 hours. As of 3:30 p.m., a plume approximately h mile wide and reading generally 1 mr/hr was moving to the north of the plant. The ARM's helicopter is m,;, being used to define the length of the plume. Airborne iodine levels of up to 1 x 10-8 uC1/mi have been detected in Middletown, Pennsylvania, which is located north of the site. Media interest is continuing. The Commonwealth of Pennsylvania is being kept informed by plant personnel.

Contact:

D. Haverkampt 1254, R. Keimig 1252, E. Brunner 1240 Prepared by Ext. Section. Chief Ext. Branen Chief Ext. Distribution: Dudley Thompson, Execut:ve Officer for Operations Support, HQ N. C. Moseley, Director, Division of Reactor Operations Inspection, HQ G. Klingler, PN Coordinator r Received via CMC SM [- 3/28/79 4:40 [ v' b ~ F l ~.. -

e PNO-79-67E i f Plant Status Reactor cooling continues using the 1 A main reactor coolant pump with steam generator lA steaming to the main condenser, which in turn is cooled by river water. Changes to this cooling method are not planned for the near term. An operability status is being compiled of equipment for use as backup in the event of failure of existing operating equipment. The hydrogen recombiner is in an operable statust however, shielding of its piping and components is not fully instalAledsn dsresently considered nd i u a w -s. u - inadequate. Leadashielding^t; t.',., asuya on an expedited basis. Calcu-lations of hydrogen in containment show that the present concentration is j less than 4%, the staff's limit on allowed concentration to ensure an explosive mixture is not obtained. Attempts are being made to obtain a containment atmosphere sample, The waste gas decay tank pressures were 9Q pso at 10:15 p.m. on March 30 and had been relatively constantfor 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. Reactor coolant temperatures measured by incore thermocouples at 52 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 remaining stable. i l l I b 4 0 e q ~' ~~ _.f -w-. . ~,;- =

~ W Environmental Status ARMS flights between 9:30 and 10:30 p.m. on March 30 and between 12:00 and 1:00 a.m. on March 31 were able to trace the plume out to 18 miles. Readings o f x G r i xsil11 r e e n i g e n s x p e x x h e s u x a n d x1 x B xs t 11i re e n y a n s x p e r x h e e r At a distance of one mile from the plant, readings were 0.5 milliroentgens per hour (mr/hr) during the earlier survey and 1.0 mr/hr during the later survey. At the 1R nile point, readings of 0.1 to 0.2 mr/hr were obtained. Flights are being made at approximately three hour intervals. Offisite ground level gamma surveys in the Middletown area and north, between 9:30 p.m. March 30 and 1:00 a.m. March 31, range indicated levels from 0.2 to 0.5 mr/hr. These measurements were taken in the general direction of the plume measured in aerial surveys. W A A / 2*) W At 3:00 p.m. on March 29/the licensee pulled thermolominescent dosimeters l from 17 fixed positions located within a 15 mile radius of the site. The dosimeters had been in place for three mo,nths and had been exposed for about 32 hours after the incident. Only two dosimeters showed elevated exposures above normal levels. The highest reading observ'ed was on Three Mile Island. 0.4 miles north of the reactor at the North Weather Station. At this location, the quarterly accumulated exposure was 81 mr, approximately 65 mr above the normal quarterly exposure rate. The other high exposure was observed at North Bridge. 0.7 miles NNE of the reactor at the entrace to the site. At this I location, the total quarterly acculumated exposure was 37 mr or approximately 22 mr above the normal quarterly Exposure rate. Duringxshexemeninxmilkingxhearx During the evening ailking hours on March 30, milk samples were collected by the Pennsylvania Department of Environmental Resources at the following locations: Harrisburg (2 sites) York i Middletown Bainbridge Etters Analyses showed no detectable radiciodine. The cows had been fed on stored feed but had been outside for exercise. The Pennsylvania Department of Environmental Resources also collected water sa samples at filtration plants at Columbia, PA (for the City of Lancaster) and Wrightsville on March 30 in the morning and early afternoon. Both sample points are downstream of Threei11e'3sland.' No detectable activity was found.

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cg my ci L. @ I t ..nM6; . WI q;, 5, 3 # P:0 POSED FN INF09.4AT)*0N - 600 M h/3/74 $l ......x I 3 Plant Status. <g$q; $2 6 Ron= tor pres,sure remains nest 1000 psi; with bulk core coolant y g,' lolet ene nuttet temueratures at 280*F. Core thermocouple l N.M.S t readings are relatively unchanged and indicate a maxims temocra-1%.w$_. w.R t&g=:7; J y?- f i ture of h770F which is well belN saturstion te ocreture for this tj D(r[. $W oressure. (Ontv 2 thermocouples read rebove 400 F). Tr4 gas 0 the, %gmg s hgM* subble still aspeers to be present at a much reduced volute, M p.-- 5 +- g, - with bubble size calculations still being evaluated. Dega s i fi ce-

%y tion continues.

Centainment etensphere r.,easurements indicate $g{ r>wn; ' E4'hr.% ibout 1.,;. present hydrogen. One hydrogen recoe.biner.is ccerating, ty-igp%? 'W .u.. and a 12 04,y time period is proJgcted for redu:!ICn of inc mvdro- ~0?i%*: bn g65 ConCGntration to sbout lE gm. ; .i. ye. pdA Plann to use a robot dcVice to obthln 8 ori.Mry coolant sam 0le 4,Yi?[y arc being evslua ted. Preop testing with the robot Is i.e crogress. Q.M%t No sur,,eillance #Iights have been conducted since 3 AM on April 2 Ny

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ynf:-g% because o f weather, All offsite ground surveys indicate ahnut %y3M.. km, 0.02 millirrm/ hour, exceot for a brief period during perindie rapjg. hh:MM venting of the Prinary Sys, tem Makeuo Tank to the vent headar. F4il- ~ YN!?! Ouring this venting, an of f slte team detected a belef, downwind h nw.r r --q 1.5 millirentgen hour ground lavel drase rate with a rsold return .EPdI.E... p-rhi?Pi* te 0.02 millirentqcn/hnur. This level 15 icss than others rooorted Rys:,E ' N..,, w..,,. Dreviously for Sissilar 00erational a:!ivltits. N.3,9. 1 I N-w% i-g;. A GIs.% N T.?. A co r ova l g [ (C 4 proval,' p -/ m.c P."W. f.Q? ~.

M Jeas/ T="me - l 1/y/l f I ~ L.L. IMMEDIATE ( PRELIMINARY NOTIFICATION April 4, 1979 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-79-67F This preliminary notification constitutes summary information of an event of safety or public interest significance. The information presentea is a F, summary of information as of 8:30p.m. April 4, 1979 Facility: Three Mile Island Unit 2 Middletown, Pennsylvania (DN 50-320)

Subject:

NUCLEAR INCIDENT AT THREE MILE ISLAND Environmental Status Preliminary analysis by FDA of sixteen milk and miscellaneous food products collected on April 3,1979 showed no detectable iodine concentrations in [... ? ':. 12 samples and iodine ranging from 12-18 pCi/1 in 4 milk samples. The . State of Maryland reported on April 4,1979 the results of analysis of 12 milk samples collected from 3 to 20 miles from the site. All samples were reported as less than the minimum detectable activity (MDA). One process mike sample from Harrisburg also was reported by the State of Maryland as MDA. Three water samples, two at Conewago and one from Holtwood Dam were 7 i reported as MDA by the State of Maryland. Continuous ground level radiation surveys performed on April 4,1979 by . =:. tne NRC survey teams on the east and west side of the Susquehanna river ].). from a distance of 4 miles north to 4 miles south of TMI showed radiation i CONTINUED t .: re. I

_~ Continued April 4, 1979 Page PN0-79-67F levels averaging less than 0.03 mR/hr on thedCast side of the river and .01 to.04 mR/hr on the west side of the river. Prevalent wind direction during the day was from M e t 4 Two ARMS surveys were performed on April 4, 1979, one at 1215 hours and one at 1520 hours. Both flights identified the plume to be in the section of 270 and 300. The earlier flight identified by GM surveys radiation levels of 0.8 mR/hr at one mile from the plant and 0.4 mR/hr at 3 miles i installed ARMS instrumenta-from the plant, The later flight used normally/k abb tion and measured radiation levels of 5 times backg(round)at one mile M 01 M dJ0.0&Ik (& A distanceand3timesbackground)at2milesdistance. A one hour air sample taken about 'i300 hours April 4, 1979, in Goldsboro -10 indicated I-131 as less than 1 x 10 pCi/cc. OCCUPATIONAL RADIATION EXPOSURES Three occupational radiation doses in excess of the regulatory limit of 3 rems per calander quarter have been confirmed. All three exposures were licensee personnel. The reported doses ranged from 3.855 rem to 4.175 rem. CONTINUED i i L

Continued April 4, 1979 Page PNO-79-67F To date on April 4, 1979, there have been 12 individuals with doses greater than 2 rems but less than 3 rems. These doses are for the period January j 1 to April 4, 1979 but it is believed the majority of exposure was received as a result of the incident. More specific occupational exposure data is expected to be available in the near future. j l 1 i l

IMMEDIATE PRELIMINARY NOTIFICATION April 1,1979 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-79-67H This oreliminary notification constitutes summary information of an event of safety or public interest significance. The information presented is a summary of information as of 6:30 pm on 4/1/79. Facility: Three Mile Island Unit 2 Middletown, Pennsylvania (DN 50-320)

Subject:

NUCLEAR INCIDENT AT THREE MILE ISLAND Plant Status a Primary system pr ssure is bein continue to show decrease in y,g held at about 1000 psig; incore thermocouples fuel channel outlet temperatures which now range from about 230 to 480 F. President Carter visited the TMI reactor site during the afternoon (4-1-79). At 1:30 p.m. today a sample of gas from the Unit 2 containment atmosphere indicated 2.1% hydrogen. Four percent hydrogen is the staff's limit on allowed concentrations to ensure an explosive misture is not present. Bulletin Issuance u ;. g t,fn,;u The Nuclear Regulatory Commission today has issued an Office of Inspection and Enforcement Bulletin regarding the Nuclear Inc,ident at the Three Mile Island reactor. This bulletin is being sent'to all utilities with a Babcock and Wilcox pressuri:ed water reactor, the supplier of the l Three Mile Island Unit 2 reactor. These utilities are being provided early information and assessment of the incident and are being askeo to promptly review their facilities and procedures in light of the incident to preclude a similar event. A response to the NRC is required within ten days. This same bulletin is being provided to all other power reactor licensees and construction permit holders in the country for information. At this time the NRC is not requiring reactor shutdown nor reduced power h p a% m. j Additional Inspectin Coverage p n In a related action, the NRC dispatching an inspector to every licensed 3 site with a Gabcock and Wilcox reactor. These inspectors will provide increased on-site inspection at G.those plants. ONTINUE0

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[ a Continued April 1, 1979 Page 2 PNO-79-67G Environmental Status / . M gi j ARMS flights were conducted at 6:00 a.m. and 9:00a.m. on April 1, 1979. The plume readings were essentially the same for both flights. The plume was in the SW directon. The maximum level at i mile from the .H plant was about 3 mR/hr at 500 feet. At three miles, the levels were from 0.3 to 0.5 mR/hr with the maximum reading at 9:00 a.m. occurring at 200 feet. The level at 10 miles was about 0.2 mR/hr. g^*& Two additional ARV flights were conducted on April 1 at 1 p.m. and 2 p.m. which consisted of surveys around the facility at a radial distance of one mile. The peak reading during these flights was 1 mR/hr at a height of 500 feet. At the time of the 1 p.m. flight the wind was at 8 knots and the plume was intersected at 165 -192. At the time of the 2 p.m.flighttheplumewasintersectedatadistanceofonemileat 145'-175 and the peak reading was 3 mR/t)r at 500 feet. Onsite ground level radiation surveys during these ARM 8 flights ranged from a maximum of 3.0 mR/hr to 0.2 mR/hr. I Ofisite ground level surveys taken on April i between 11:00 a.m. and 4:15 p.m. on both sides of the river in a southerly direction generally ranged from 0.01 mR/hr to 0.2 mR/hr. A 0.5 mR/hr reading was found near the northern tip of Brunner's island approximately 2 1/2 miles south of the facility. The licensee reported results from 5 milk samples taken from four locations around the plant during the evening of March 30, 1979. The samples included one sample of goat's milk and four samples of cow's milk. The l highest level was reported for the goat's milk and was 41 picocuries per i liter (pCi/1.). The highest level in cow's milk was 8.4 pCi/1. The NRC has estimated the thyroid dcce to a child drinking milk with concentrations of radiciodine at 41 pCi/l to be about 0.2 millirem per day. The thyroid dose to an adult would be about 0.07 millirem per day. Each of these samples indicated levels slightly above normal background levels for radioiodine. The Bureau of Radiological Health, HEW also reported identifying radioiodine j in six samples of milk collected on March 31, 1979 from four locations ) around the plant. These samples were split with the State of Pennsylvania. Analyses of the samples identified near background levels of radioiodine. The levels ranged from the minimum detectable limit to about 40 pCi/1. For comparison, the licensee's environmental report for 1977 showed observations of 0.74 to 31 pCi/l of I-131 in milk throughout the year previous to the incident. At 12,000 pCi/1, the U.S. Department of Health,- Education, and Welfare recommends placing dairy herds on stored feed. Local herds are already on stored feed. A dete, :P meriterd rclence f.w. Um s i te nave oeen passeu cnrougir-pgs w4c4.nry <41 ton, CONTINUED l

l o Continued April 1, 1979 = Page 3 PNO-79-67G Attachm W (1) Radiation Survey Map (6 -(2) Radiation Survey Map (9:00 a. 7

Contact:

DThompson, IE x28487 NCMoseley, IE x28160 . =.. Distribution: Transmitted H St Chairman Hendrie Commissioner Bradford S. J. Chilk, SECY Commissioner Kennedy Commissioner Ahearne C. C. Kammerer, CA Commissioner Gilinsky (For Distribution) =- Transmitted: MNBB P. Bldg J. G. Davis, IE L. V. Gossick, E00 H. R. Denton, NRR Region I H. L. Ornstein, EDO R. C. DeYoung, NRR Region II J. J. Fouchard, PA R. J. Mattson, NRR Region III N. M. Haller, MPA V. Stello, NRR Region IV R. G. Ryan, OSP R. S. Boyd, NRR Region V H. K. Shapar, ELD SS Bldg (MAIL) W. J. Dircks, NMSS J. J. Cummings, OIA R. Minogue, SD =:.: White House Situation Room EPA FDA/BRH DOE /EOC k 22'.2 J IMMEDIATE PRELIMINARY NOTIFICATION 5: . ~ . :j.

Plcnt Status ~ Recctor prossure is being held at ab out 1000 pai. Incore ther o:cupies continue to show a docrease in fuel channel temperatures, with all =eaourencnts below 475 degrees F. Bulk core inlet and outlet temperatures are 280 degrees F. At 11 p.m., April 1, a containe, cat air sanple indicated 2.3 7. hydrogen. -he W M ""'T 4,4 gas bubblo in the prbry cystem it 'v, W +-L m J c-o e---M iruo& To. S ' j a a e s .no,- 4,h t, em. _ < s 4,.., w e s,,,,4 _;,.gew w.% 1. n~ oee a nc o u.+ gi u p he .s s c s ie,,,j.y.,. 3 act b. 3 4. L,,.. c,,) Action on Other Facilities i The Ihree Mile Island Unit 2 (TKI-2) pressuriced water resctor was supplied by q Babcock & Wilcox (3 & W), end all utilities with a E5W reactor were sent an II l Bulletin yesterday to provide them with information about the DCI-2 incident, i require a prerpt review of their plant conditions, and ef fect actio: to prevent such an incident. hTC inspectors are being sent to each liccesed 36W reactor to provide increased inspectico coverage. Additientel reactor shutde.rss or power reductions are not being required by the h7c at this time. Environ =cntal Status Surveillance' flights were conducted at 6 p.:3. cu April I cnd 3 a.m. on April 2. Mar.i=.:n levels de tec t ed ve re 1.0 =ad 1.5 millire../ hour, res pec tively, and were at 500 ft. cititude 1 mile fica the pl aa t. All o f f s i t e g r ound su rvey s n cv in d ic a t o i_=r. less than 0.2 e.1111re=/ hour. (= ilk c =ple data per telephone discussion),- N e,, t h.,- b,.;.., O f, . k.J..MN n. ws I TTs0POSID FN 7 a.c., 4/2/79 f a.p , / &l p, n/ f, w. L L. C - -p .1 "= .y l l g-- .-q.. + s-. r pie-, ...-.m,= .-,=,.m. gey. ,* - - ~ - y-* --m y mem---w

/ fl o T . T S SL< E D IMMEDIATE PRELIMINARY NOTIFICATION April 1, 1979 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-79-67H This preliminary notification constitutes summary information of an event of safety or public interest significance. The information presented is a summary of information as of 6:30 pm on 4/1/79. Facility: Three Mile Island Unit 2 Middletown, Pennsylvania (DN 50-320)

Subject:

NUCLEAR INCIDENT AT THREE MILE ISLAND Plant Status g Primary system pr ssure is being held at about 1000 psig; incore thermocouples continue to show decrease in C;f fuel channel outlet temperatures which now range from about 230 to 480 F. Pr?sident Carter visited the TMI react'or site during the afternoon (4-1-79). At an Aoday a sample of gas from the Unit 2 containment atmosphere indicated e,.4% hydrogen. Four percent hydrogen is the staff's limit on allowed concentrations to ensure an explosive mi)Gure is not present. Bulletin Issuance 3 ;.,,g g JjaJ. The Nuclear Regulatory Commission today has issued an Office of Inspection and Enforcement Bulletin regarding the Nuclear Incjfjent at the Three Mile Island reactor. This bulletin is being sent/to all utilities with a Babcock and Wilcox pressurized water reactor, the supplier of the Three Mile Island Unit 2 reactor. These utilities are being provided early information and assessment of the incident and are being asked to promptly review their facilities and procedures in light of the incident to preclude a similar event. A response to the NRC is required within ten days. This same bulletin is being provided to all other power reactor licensees and construction permit holders in the country for information. At this time the NRC is not requiring reactor shutdown nor reduced power h p h. g

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Additional Insoectt,n Coverace P In a related action, the NRC dispatching an inspector to every licensed 3 site with a Babcock and Wilcox reactor. These inspectors will provide increased on-site inspection E .,- at 6.those plants. t 6e [0NTINUED ~

g.T continuzd April 1, 1979 PHO-79-67G \\

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page 2 4.e t 5-Environmental Status j / ARMS flights were conducted at 6:00 a.m. and 9:00a.m. on April 1,1979. AWg g The plume readings were essentially the same for both flights. The plume was in the SW directon. The maximum level at 1 mile from the plant was about 3 mR/hr at 500 feet. At three miles, the levels were from 0.3 to 0.5 mR/hr with the maximum reading at 9:00 a.m. occurring at 200 feet. The level at 10 miles was about 0.2 mR/hr. l-& % Two additional ARd flights were conducted on April 1 at 1 p.m. a'nd 2 p.m. which consisted of surveys around the facility at a radial distance of one mile. The peak reading during these flights was 1 mR/hr at a height of 500 feet. At the time of the 1 p.m. flight the wind was at 8 knots and the plume was inter:;ected at 165 -192*. At the time of the 2 p.m. flight the plume was intersected at a distance of one mile at 145*-175* and the peak reading was 3 mR/tyr at SnD feet. Onsite ground level radiation surveys during these ARMS flights ranged from a maximum of 3.0 mR/hr to 0.2 mR/hr. Offsite ground level surveys taken on April 1 between 11:00 a.m. and 4:15 p.m. on both sides of the river in a southerly direction generally ranged from 0.01 mR/hr to 0.2 mR/hr. A 0.5 mR/hr reading was found near the northern tip of Brunner's island approximately 21/2 miles south of the facility. The licensee reported results from 5 milk samples taken from four locations around the plant during 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 reported for the goat's cilk and was 41 picocuries per liter (pci/1.). The highest level in cow's milk was 8.4 pCi/1. The NRC has estimated the thyroid dose to a child drinking milk with concentrations of radioiodine at 41 pCi/1 to be about 0.2 millirem per day. The thyroid dose to an adult would be about 0.07 millirem per day. Each of these samples indicated levels slightly above normal background levels for i radiciodine. The Bureau of Radiological Health, HEW also reported identifying radiciodine in six samples of milk collected on March 31, 1979 from four locations around the plant. These samples were split with the State of Pennsylvania. Analyses of the samples identified near background levels of radioiodine. The levels ranged from the minimum detectable limit to about 40 pCi/1. For ccmparison, the licensee's environmental report for 1977 showed observations of 0.74 to 31 pCi/1 of I-131 in milk throughout the year previous to the incident. At 12,000 pCi/1, the U.S. Department of Health, Education, and Welfare recommends placing dairy herds on stored feed. Local herds are already on stored feed. --T a Ste, M7 mcnittrcd r&=c, n u Lhe site insve oeen passeu carouk Qk af f;e;oney f;1 tort, i CONTINUED i ,-v

/ Con?.inued April 1, 1979 f" Page 3 PNO-79-67G cu. .gM Attachm h y. (1) Radiation Survey Map (6:00 a.m.) (2) Radiation Survey Map (9:00 a.m.) 1 M 7

Contact:

DThompson, IE x28487 NCMoseley, IE x28160 1 Distribution: Transmitted H St Chairman Hendrie Commissinner Bradford S. J. Chilk, SECY ~ Commissioner Xtnnedy Commissioner Ahearne C. C. Kammerer, CA .i Commissioner Gilinsky (For Distribution) Transmitted: MNBB P. Bldg J. G. Davis, IE L. V. Gossick, EDO H. R. Denton, NRR Region I H. L. Ornstein, E00 R. C. DeYoung, NRR Region II i J. J. Fouchard, PA R. J. Mattson, NRR Region III N. M. Haller, MPA V. Stello, NRR Region IV R. G. Ryan, OSP R. S. Boyd, NRR Region V H. K. Shapar, ELD SS Bldg (MAIL) W. J. Dircks, NMSS J. J. Cummings, OIA R. Hinogue, SD White House Situation Room EPA FDA/BRH 00E/EOC ~ i IMMEDIATE PRELIMINARY NOTIFICATION i

s PROPOSED PN INFORMATION - 6: 30 IH - 4/3/79 Pl ant Status L I,- Reactor pressure remains near 1000 pai, with bsik core coolant inlet and outlet [ C

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-~n V changed and indicate a maximu:n temperature of 460 degrees F vhich is well below saturation temperatsre for this pressure. (only 3 thermocouples read above 400 degrees F). Gas is still indicated to be present with the bubble stee cal-culations, but its volume is erratic indicating the eff ects of solubility and bubble dispersion. Degasification continues. Containment atmosphere measurements indicate about 2.1 percent hydrogen. One hydrogen recombiner is operating and an all 11 day time period is projected,'or reduction of the hydrogen concentration to about 17.. At 1430 one of three pres-suri=er icvel transmitters failed. Alternate methods of level measurement are being develeped and procedures reviewed.for implementation while calibration can i occur with the presently existing detectors. Flans to use a robot device to obtain a primary coolant sample are being evaluated. Preop testing with the robot is in progress. Surveillance flights have been conducted since 10:00 AM on April 3, maxirmm radiation levels occurred during 12:00 - 13:00 flight. At one mile from plant I radiation level was 2.0 mR/hr. Offsite ground surveys indicated about 0.5 millirem /hr for a brief period on the east side of the site. Radiation levela generally ranged from 0.01 to 0.02 millirent' gen / hour around the site. /,_ i e

~ 2 t An air saeple for I was collected in the plume at a location about 0.8 131 miles SSE of the plant. The I concentration in air was less than IE-10 7 "~" microcuries per cubic centimeter. TLD's at the 40 offsite locations for the period 4/1/79 to 4/2/79 showed the highest radiation levels for the period occurred strabout 2 miles NW of the site. At that point the total 24 hour dose was 1.7 millirentgens. N ..l..' l l 7). Svaek ~ e f797;. 0: 4'Ofm $m1 cr( m = --

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~ opwJ. _.WJ. 1G-DOEDIATE f/. // + PRELIMINARY NOTIFICATION April 5, 1979 PRELIMINARY NOTIFICATI0t; 0F EVENT OR UNUSUAL OCCUR.RENCE--PNO-79-67K Wis preliminary notification constitutes stusmary information of an event _ of safety or public interest significance. The information presented is a summary of infotination as of 7:00 a.m. on 4/5/79. Facility: Three Mile Island Unit 2 Middletown, Pennsylvania (DN 50-320) Subiacti NUCLEAR INCIDENT ' AT THREE MI12 ISLAND Plant Status Reactor pressure remaius near 1000 psi with bulk core coolant inlet and I outlet temperatures approximately 280 degrees F. Core thermocouple readings are relatively unchanged and indicate a maximum temperature of 462 degrees F which is well below saturation temperature for the present reactor pressure. Three thermocouple readings remain above 400 degrees F. The number of thermo-couple readings being monitored has been reduced to 30. Containment atmosphere measurements indicate about 27. hydrogen. One hydrogen recombiner is in operation, with another unit on standby. A Heise pressure gage has been installed to provide an alternate method of determining the pressurizer level by monitoring the steam space pressure and water space pressure in the pressurizer. Testing procedures are under review. The pressurtzer is being vented to. the containment for about 15 minutes every 6-8 hours. Plana for use of the robot to obtain a primary system sample have been developed., 4 e CONTINtED I O a e t 6 ' hatIN' i % M@WP4.M T@ LIEF 4L FM Ad a w g e -- N'=- ag = wM - 94 4 b edE gM" i 'DM(}. MEM49N' 4 11

5 Continued April 5,'1979 Page a pgo.79-67K Environmental Status Preliminary analysis by FDA of 16 milk and miscellaneous food products collected on April 3, 1979 showed no detectable iodine concentrations in 12 samples and iodine ranging from 12-18 pCi/1 in 4 milk samples. The State of Maryland reported on April 4,1979 the results of analysis of ! ;' I -12 milk samplec collected from 3 to 20 miles from the site. All samples. were reported as less than the minimum detectable activity (MDA). One I process milk sa=ple from Harrisburg also was reported by the State of i Maryland as less than MDA. Three water samples, two at Conewago and one from Holtwood Dam, were reported as less than MDA by the State, f Marylanp. i FDA collected 5 other milk samples on April 3,1979, two of whi:h showed 'todine concentrations of 12 and 17 pCi/1. One showed no detect Lble i iodine and there are no results for the other two samples. One; of these l samples showed a cesium concentration of 13 pC1/1; there are no cesium results for the other four. The State of Pennsylvania analysis of 15 milk samples collected on April 3,1979 showed one with iodine at 19 pCi/1, 13 with no detectable iodine, and I with no result. Four showed cesium levels ranging from 10-26 pci/1 and there are no results for the other 11 samples. ' All of the samples collected by the State and FDA were split i

samples, i.e., shared to obtain independent results.

CCNTINED O I a. 9 + ,s .id $'.%'y2 WO '.h Y l

l 4 ~ r% tint.cd ?!O2 3 t.p;il r,, 30/g i::0 70 to'/K Cr:utinisws Ornu.d 1 rol n.tlit: tion surveyu p::rrm.cd on t.pril 4,1.979 by 1he i.?.C :. n fr.y tc.n:;. a f.hn r.:.r;t nd t s: t sit o of the fu*:c n h"n::a River f I, ?.1 A viiste..c4 ?:f 4 t rili.:s v.)ri!) to 4 hilc5 '7 91.h if KII h :"M 4....r.Lf 61 1:.. 21s w.. r;1>.3 1:cs <.hcn 0.n3 a ':/ n. ::a u.c <,. st side.,f the ri :. r rnd 0.01 t o n. 04 9/l,.* e n the Uc, t t ida o r f..*n r f eur. ".. s.vcl er.t uf nd liv.e:tica a::rir.3 <!a Wg ifes f... ; c.!,a,. :st. Six ?.":S c:n ~ey> tinre !mrforuref c.n tpril 4,19/9 t: Dr.01. 0300, 0000, .y.00,. S.Ca .il W P. ..tres. '(ha 111.;t..s * '..nl.i r!c..I :.;.a :1Mo to be in tha sections or 21'0' cr.d ~!00'. The t.:. du.1 r.;i< Lien it,vals sterra detected "" ring th. 0:7:0 flicht i!ocie:g.;hi..h I.cis of 1.2...?/he :.e s':t et'.d u;ing port.910 n roy .i.r rs. T!.c l'.M2 flidit u..vl n r.711y f od.n11cd v t.r!'S fnistru.' otatien c.1d e.d.:" red ; :fst. inn li..rols br t Not 0.1 !..?/hr (<' ms't 5 tii.:es ht.ck0rmind) s.t 1 i.elle di:;t.v.co and chout 0.06 u2/hr (ebout 3 tir ::s 1; ckgroor.d) at 2 uili:s di,t'nce. On fl,ril 4, a "O cinal.a air : c.,ple tol:en chout 0.100 ncar '/ork !!GWn, md a CD-n!"uta ::..plo t;:en co0tJ.t300 in Col.kbaro, both indice.ted less { tM n 1 x 7.0 20 pCf /lal I-131 (r : xbt:4 perii'ssibic concentriittun for i p..tr.:.tridted arnes). 6 [.. Ucce raths in populatad crans as raer,sured.by !!RC thorr.olu.11nescent \\ Mi ('osiceters (TI.Os) shbund,midor chcnoas fiom thi previnus day. 111, ice s fluctuations are expected at these low dase rates. In11ouing are.t.he ~- e:posure rates for prov tously reported Tec..t. inns: + 9 col 4TIlmED O e i 7M f 4 1 y a

. * 'l b Y b

4-?

- -~ - - - --- ~ l Cer.tinMd. Pr30 4 toril S. 1979 P :0-70-fi/K .EDT0 89.to (fi.il.1IF; "fDiDS.J 0.E.lj21!!'l f./.1/10 f/?/i2 f/.3./79 .A/^f 9_ t N1:.outh 0.15 0.01 0.20 0.04 !!i.'"1 *tte..) 0.04 0.01 0.02 0.01 51dt.' uro 0.13 0.05 0.0/ 0.07 Gold::.hro 0.04 0.02 0.05 0.02 f.u:1.=ic. cry 0.05 0.02 0.04 0.03 Pte. :nnt 0.:ve 0.04 0.02 0.05 0.01 o. k I:cyr.n 0.07 0.02 0.10 0.05 (%..."ri.o :* i:. hts 0.04 0.02 0.07 0.02 titssvillo 0.03 'n.02 0.07 ' O.02 0':c'JFti@?l B:.dja.'tj4 f!P/ui 95 f Thre.s ora;ur#.tlonal rcdiation do':es in uxr.ncs of the raculatory liuit of 3 P: s ;1er calende.P quarter linve b,an confireed. All three agosuras i: Ore liceneca personit:1 and ':nre c;:pret.ntoly 4 rcas (this includes the tes c::posures vr. ported in P!:0 79 G'78). To 8.ste on t.pril 4,1979, there h.we b:-mn 32 inijividuals with doses ww.Nr than 2 re.is init tr:ss i.hrn 3 Pcise. Three doses are for the pqricd &nt':ty 1 to't.p. il 4,1019, but it. fs bc1(cycd the cajority of nge:ure tras recalved as a result of the incident, f* ore specific oce.upational or:posure data is :spected to be availsble in the near future.. t ? I Co.9 tit:UED l l ' % 'o un s ,y ,4 ! 98NsN# ' 'O~

. _ ~ ~ continued April 5, 1979 Page S Iso-79-67-K Other Information_ At about 5:00 p.m. on April 4,1979, the licensee initiated a shipment of solidified low level waste which was collected from Unit 1 prior to the Unit 2 event of March 28, 1979. Additional shipments will be made twice daily. The waste is being sent to the Chem Nuclear facility in South Carolina. The concentrations of radioactivity in the containment building which vere reported previously (PN-79-67I dated April 3, 1979) have been revised for the sample taken on March 21. The change was made due to the discovery that the wrong base volume had been used. The corrected values are as follove: Isotone Microcuries per milliliter Xe-133 26.0 Xe-133m 7.9 Xe-135 '3 5 I-131 0.025 IndustriaI Waste Treatment System (IWTS) j As of 0500 on April 5,1979 the IWTS sump was 747. filled with about 100,000 gallons of capacity still available. The'. State of Pennsylvania approved c. release of materiel from the IWIS that does not exceed permissible values. No releases h' ave been made as of 0500. %48, l^..- r O e ene C,Yw '. L,v u-n.- -# L n,. hW w c.a sh e : e.narw a~-

s.:m.Gann n

~ * * ~

.~. 1 D.i.tinued f.pril 5,1979

'. co 6 Pi;0-70-67K Fni.g

STi. :.,$r(.6, TE :1.0/;07 !!C":cs:Tey, IE x201GO Cir..i'.utten: r.4n.:.itt.;d H St I*. fi.l*'n th Mele cur.:ilhinoir Ori.! ford S. J. Chilk, SECY Cu afec ier.. r !f c.. rely Co. f e f onar,*.!.:. tic,,a C. C. X.i.arer CA Co.,1:;!w e Cilinsky (For Ole Leil;<rtir.0) Tr.... f tterf: i:*.",3 P. ;;is!.J J. r.. n:. fis, IE I.. V, r..; ;i '<, ! 00 H. R. n.'i.:...n, 'ptR t'. :gie n I ~~ r H. l.. C'rav:'ain. l1:0 R. C. 00 "..g. !:::n i B:U cit II J. J. Ic"i*!s. ti, PA R.. J. ih t. tun, s'.iR. Cryion IfI ft. II. t h ll t e, i:M V. c.'.c11 o, I:."R. R.:uic.i IV et. '.1 it. K. pp n. OSP R. 5. 0 y.f, :':!R D:: git,n V .Ch ;'ar, FLD 55 Didg (1:dII. II. J. 01. r::<, C.S J. T,)Co. if ngs, OIA j ~ R. !*Inut;ue, SD ~ *iit? !!./ :e Sit.:' tion.W.a (!\\ ns2rrty ,,) ) ~ i:PA iT.3/0;i' ' ~ p.ys.j gc c * - - ~~

~.:..

Far af striNetietn for r::0 - Thrw ::11,.1 I;l ::d (T:s'0 37--) Qi!g Di'stribut.fon: IE (Tiil) Sito: (Provide en:,y to STATE) iii<.n !! stern Si t:3.tibii'70:n L't'A ro.varK ' --

00GlioC ~~ ~

FD W iG!W '~~ ~ rr.P (State o'f~/A) ~ DCPA ~ !!W !!. raftstry (Ft.A) c. -~.. C Gfon I........ i reJ en II __..__ ~ J r- ~ Routon III Cc31on IV C.>gion V,,_, _ IK*.EDIATE T PRELI:1II ARY IJOTIFICATION r j Mu.., .m a u.n 4#. 4, ~

. cw fog fwn m OmMw/& Maw f ~ IMMEDIATE gg PRELIMINARY NOTIFICATION gy April 5, 1979 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-79-67X This preliminary notification constitutes summary information of an event of safety or public interest significance. The information presented is a summary of information as of 7:00 am on 4/5/79. Facility: Three Mile Island Unit 2 Middletown, Pennsylvania (DN 50-320)

Subject:

NUCLEAR INCIDENT AT THREE MILE ISLAND Plant Status Reactor pressure remains near 1000 psi with bulk core coolant inlet and outlet temperatures approximately 280 degrees F. Core thermocouple readings are relatively unchanged and indicate a maximum temperature of 462 degrees F which is well below saturation temperature for the present reactor pressure. Three thermocouple readings remain above 400 degrees F. The number of thermocouple readings that are being monitored has been reduced to 30. Containment atmosphere measurements indicate about 2% hydrogen. One hydrogen recombiner is in operation, with another unit on standby. A Heise pressure age as been installed to provide an alternate method of determining th essurizer level by monitoring the steam space pressure and water space pressure in the pressurizer. Testing procedures are under review. The pressurizer is being vented to the containment for about 15 minutes every 6-8 hours. Plans for use of the robot to obtain a primary system sample have been developed. Environmental Status Preliminary analysis by FDA of 16 milk and miscellaneous food products collected on April 3, 1979 showed no dstectable iodine concentrations in 12 samples and iodine ranging from 12-18 pCi/l in 4 milk samples. The State of Maryland reported on April 4,1979 the results of< analysis of 12 milk samples collected from 3 to 20 miles from the site. All samples were reported as less than the minimum detectable activity (MDA). One process milk sample from Harrisburg also was reported by the State of Maryland as less than MDA. Three water samples, two at Conewago and one from Holtwood Dam, were reported as less than MDA by the State of Maryland. l CONTINUED l l i l I

.m Continued April 5, 1979 Page 2 PHO-79-67K FDA collected 5 other milk samples on April 3,1979, two of which showed iodine concentrations of 12 and 17 pCi/1. One showed no detectable iodine and there'are no results for the other two samples. One of these samples showed a cesium concentration of 13 pCi/1; there are no cesium g results for the other four. The State of Pennsylvania analysis of 15 milk samples collected on April 3,1979 showed one with iodine at EEE 19 pCi/1,13 with no detectable iodine, and 1 with no result. Four 2; showed cesium levels ranging from 10-26 pCi/1 and there are no results ~~ for the other 11 samples. All of the samples collected by the State and a...==. FDA were split samples, i.e., shared to obtain independent results. - - ~ ~ ~ ~ Continuous ground level radiation surveys performed on April 4,1979 by J.? ~ the NRC survey teams on the east and west sides of the Susquehanna River

== from a distance of 4 miles north to 4 miles south of THI showed radiation levels averaging less than 0.03 mR/hr on the east side of the river and 0.01 to 0.04 mR/hr on the west side of the river. Prevalent wind direction during the day was from the east. Six ARMS surveys were performed on April 4,1979 at: 0001, 0300, 0600, E.. _.... "~~ 0900, 1200 and 1522 hours. The flights identified the plume to be in the sections of 200 and 300. The maximum radiation levels were detected during the 0600 flight during which levels of 1.2 mR/hr were detected using portable survey meters. The 1522 flight used normally installed ARMS instrumentation and measured radiation levels of about 0.1 mR/hr (about 5 times background) at 1 mile distance and about 0.06 mR/hr (about 3 times background) at 2 miles distance. On April 4, a 40-minute air sample taken about 0100 near York Haven, and a 60-minute sample taken about 1300 in Goldsboro, both indicated less than 1 x 10 10 pCi/ml I-131 (maximum permissible concentration for unrestricted areas). Dose rates in populated areas as measured by NRC thermoluminescent dosimeters (TLDs) showed only minor changes from the previous day. Minor fluctuations are expected at these low dose rates. Following are the exposure rates for previously reported locations: Dose Rate (Milliroentoens per Hour) 4/1/79 4/2/79 4/3/79 4/4/79 Falmouth 0.15 0.01 0.20 0.04 ~'" Middletown 0.04 O.01 0.02 0.01 Goldsboro 0.13 0.05 0.07 0.07 ~ ise Goldsboro 0.04 0.02 0.05 0.02

ss Lewisberry 0.05 0.02 0.04 0.03

= Pleasant Grove 0.04 0.02 0.06 0.01 York Haven 0.07 0.02 0.10 0.05 l Conewago Heights 0.04 0.02 0.07 0.02 l Emigsv111e 0.05 0.02 0.07 0.02 CONTINUED 1 1

Continued April 5,1979 Page 3 PNO-79-67X Occupational Radiation Exposures Three occupational radiation doses in excess of the regulatory limit of - ~~ 3 rems per calendar quarter have been confirmed. All three exposures were licensee personnel and were approximately 4 rems (this includes the two exposures reported in PNO-79-678).

m....

To date on April 4,1979, there have been 12 individuals with doses s.:~ greater than 2 rems but less than 3 rems. Three doses are for the period January 1 to April 4,1979, but it is believed the majority of ' ee: exposure was received as a result.of the incident. More specific ~ occupational exposure data is expected to be available in the near ~~~~sm;; future. m-Industrial Waste Treatment System (IWTS) As of 0500 on April 5,1979, the IWTS sump was 74% filled with about 100,000 gallons of capacity still available. The State of Pennsylvania approved release of material from the IWTS that does not exceed permissible" values. No releases have been made as of 0500. E =.. e= Other Information f de At about 5:00 pm on April 4,1979, the licensee initiated the shipment - 2er of solidified low level waste which was collected from Unit 1 prior to to the Unit 2 event of March 28, 1979. Additional shipments will be made twice daily. The waste is being sent to the Chem Nuclear facility in South Carolina. The attached table of collective doses updated to April 3 was prepared R "~~ by a joint NRC/ HEW / EPA study group.

Contact:

DThompson, IE x28487 NCMoseley, IE x2B160 Distribution: Transmitted H St 4-Chairman Hendrie Commissioner Bradford S. J. Chilk, SECY Commissioner Kennedy Commissioner Ahearne C. C. Xammerer, CA +E" Commissioner Gilinsky (For Distribution) N+ Transmitted: MNBB P. Bldg J. G. Davis, IE h L. V. Gossick, EDO H. R. Denton, NRR Region I f": H. L. Ornstein, EDO R. C. DeYoung, NRR Region II J. J. Fouchard, PA R. J. Mattson, NRR Region III ........" T N. M. Haller, MPA V. Stello, NRR Region IV '~~u_.. R. G. Ryan, OSP R. S. Boyd, NRR Region V H. K. Shapar, ELD SS Bldg J. J.')Cummings, DIA ~~ (MAIL

== W. J. Dircks, NMSS i:Ef R. Minogue, SD t CONTINUED l .4... O' ~ =...

ContinuGd April 5, 1979 .. l Pago 4 PNO-79-67K =g;; For Distribution for PNO - Three Mile Island (PNO-67--) ONLY j i Distribution: 56' IE (THI) Site: (Provide copy to STATE) i White House SituationToom =:.id EPA Mi~ l FDA/BRH E DOE /EOC .;.wg;5 FDDA/ FEMA = BRP (State of PA) l;g; DCPA .~ ' =1 3-r HEW i i Handcarry (FAA) .._.;=h Region I = :: Region II

5 Region III EJ

.i Region IV .. #5 Region V 9? [. IMMEDIATE

s

= PRELIMINARY NOTIFICATION \\

.::.:.l.l~:

':llll:

h I*

.7*[ * * *"

^ " '

.i.' *

_g

-. l - - -

... ~ L: :. r.- - =r

ll ^ h$.'.:..

COMPARISON OF COLLECTIVE DOSES TO POPULATION WITHIN 50 MILES OF THREE MILE ISLAND NULEAR GENERATING STATION

==HE =ss f$5!f..

. =.

E"..:.ii2 + Whole-Body Average Oose er -~-" -Collective Oose to Individual rfM ' Source (man-rem) (mrem / year) +p:. i=+; =" Natural Background One year's exposure (FES) (1970 population) 233,000 125 = ~ " (1980 population) 270,700 + 2"= Normal Operation (FES) (1970 population) ' = = One year's exposure (all sources) 31 0.017 ~.g Gaseous effluents 2.05 0.0011 -Ti? 30 year operation 930 0.017 ife Preliminary Estimate of Accident Oose Cumulative up to noon 4/3/79 2000

1. 0 1970 population 1,868,000

[ 1980 census projections 2,165,651- =. =? c .....e hs.... t [Nb Note: 1 mrem (millirem) = 0.001 rem FES = Final Environmental Statement Me,

=g i=is 9:ii B

['b 22 ' ~'

p _..:=,

R*Jaf. ~.

/~~ MO M i M 1CRAUnce, IMMEDIATE PRELIMINARY NOTIFICATION April 5,1979 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-79-67K This oreliminary notification constitutes summary information of an event of safety or oublic interest sianificance. The information presented is a summary of information as of 7:00 am on 4/5/79. Facility: Three Mile Island Unit 2 Middletown, Pennsylvania (DN 50-320)

Subject:

NUCLEAR INCIDENT AT THREE MILE ISLAND Plant Status Reactor pressure remains near 1000 psi with bulk core coolant inlet and outlet temperatures approximate'y 280 degrees F. Core thermocouple readings are relatively unchanged and indicate a maximum temperature of 462 degrees F which is well below saturation temperature for the present reactor pressure. Three thermocouple readings remain above 400 degrees F. The number of thermocouple readings that are being monitored has been i reduced to 30. Containment atmospnere measurements indicate about 2% hydrogen. One hydrogen recombiner remains in operation. A Heise pressure gage has been installed to provide an alternate method of determining the. pressurizer level by monitoring the steam space e eyee pressure and water space pressure in the pressurizer. Testing procedures t CONTINUED i

Continued April 5, 1979 Pag: 2 PNO-79-67K are under review. The pressurizer is being vented to the containment for a period of i hour every 3 hours. s s:: Environmental Status = Preliminary analysis by FDA of 16 milk and miscellaneous food products collected on April 3, 1979 showed no detectable iodine concentrations in 12 samples and iodine ranging from 12-18 pCi/l in 4 milk samples. The State of Maryland reported on April 4, 1979 the results of analysis of 12 milk samples collected from 3 to 20 miles from the site. All samples .z.. were reported as less than the minimum detectable activity (MDA). One process milk sample from Harrisburg also was reported by the State of Maryland as less than MDA. Three water samples, two at Conewago and one from Holtwood Dam, were reported as less than MDA by the State of Maryland. FDA collected 5 other milk samples on April 3,1979, two of which showed iodine concentrations of 12 and 17 pCi/1. One snowed no detectable iodine and there are no results for the other two samples. One of these samples showed a cesium concentration of 13 pCi/1; there are no cesium results for the other four. The State of Pennsylvania analysis of 15 milk samples collected on April 3,1979 showed one with iodine at 19 pCi/1,13 with no detectable iodine, and 1 with no result. Four . =.. _.. showed cesium levels ranging from 10-26 pCi/l and there are no results ~ ~ _ = for the other 11 samples. -All"of the sampl.es' collected by the State and _m._.[_ ~_

.u -

.. - ~.. FDA were split samples, i.ea, shared to obtain independent results. e _... ^ ..... ~. -. ~ - _R _. lY.+ _ CONTINUED n.. _a_._ ... ~. ~ ~ ~ '"P'* 1

~ C'on?.i nued April 5, 1979 Page 3 PHO-79-67K Continuous ground level radiation surveys performed on April 4,1979 by the NRC survey teams on the east and west side of the Susquehanna River j from a distance of 4 miles north to 4 miles south of TMI showed radiation levels averaging less than 0.03 mR/hr on the east side of the river and = = 0.01 to 0.04 mR/hr on the west side of the river. Prevalent wind

= =

direction during the day was from the east. I= Six ARMS surveys were performed on April 4, 1979 at: 0001, 0300, 0600, 0900, 1200 and 1522 hours. The flights identified the plume to be in the sections of 200 and 300. The maximum radiation levels were detected during the 0600 flight during which levels of 1.2 mR/hr were detected using portable survey meters. The 1522 flight used normally installed ARMS instrumentation and measured radiation levels of about 0.1 mR/hr (about 5 times background) at 1 mile distance and about 0.06 mR/hr (about 3 times background) at 2 miles distance. On April 4, a 40-minute air sample taken about 0100 near York Haven, and a 60-minute sample taken about 1300 in Goldsboro, both indicated less than 1 x 10 20 pCi/mi I-131 (maximum permissible concentration for unrestricted areas). Dose rates in populated areas as measured by NRC thermoluminescent F dosimeters (TLDs) showed minor changes from the previous day. Minor fluctuations are expected at these low dose rates. Following are the exposure rates for previously reported locations: .;h - CONTINUED \\,. J.

Continued ApH1 5,1979 ~"~. - Page 4-PNO-79-67K %)): Dose Rate (Milliroentgens per Hour) .=.::-

2. h.. "

4/1/79 4/2/79 4/3/79 4/4/79 5..... 55.....l ,g =u Falmouth 0.15 0.01 0.20 0.04 = .=;==: Middletown 0.04 0.01 0.02 0.01

5F

,a. Goldsboro 0.13 0.05 0.07 0.07 E::.:= Goldsboro 0.04 0.02 0.05' O.02 f.[.[

* * " * ' ~ '

Lewisberry 0.05 0.02 0.04 0.'03 F +:ing q Pleasant Grove 0.04 0.02 0.06 0.01

=TEh: - l York Haven 0.07 0.02 0.10 0.05 4E;

3:G Conewago Heights 0.04 0.02 0.07 0.02 E=.

~ l Emigsville 0.05 0.02 0.07 0.02 ) .= Occuoational Radiation Exoosures "~ !.~ Three occupational radiation doses in excess of the regulatory limit of

iEi 3 rems per calendar quarter have been confirmed.

All three exposures ) were licensee personnel and were approximately 4 rems (this includes the =

its, two exposures reported in PNO-79-678).

.g :;;:, To-date on April 4, 1979, there have been 12 individuals with doses +=;:+ greater than 2 rems but less than 3 rems. Three doses are for the ".~.' :E-r = period January 1 to April 4,1979, but'it is believed the majority of =53:. ) = ins exposure was received as a result of the incid'ent. More specific E MI l ?;?..... occupational exposure data is expected to be available in the near ~ ]- future. CONTINUED l l l = =

==:

=

=

-g.. _. m =r u. ,&r4r-.m---*. - - -.v.- ---.---m-mr --e-*.#hm e.44.- +wa+.-geww, =m,-.wmg-,eei %ma -.eem'-egm wmew.m>g, e.,,w.w.*t,-pi,rM s' -9PvW"*1'- T

0 Continued April 5, 1979 Page 5 PN0-79-67K j Other Information At about 5:00 pm on April 4, 1979, the licensee initiated the shipment of solidified low level waste which was collected from Unit 1 prior to ~' the Unit 2 event of March 28, 1979. Additional shipments will be made twice daily. The waste is being sent to tna Chem Nuclear facility in South Carolina. e+=- The concentrations of radioactivity in the containment building which were reported previously (PN-79-67I dated April 3,1979) have been revised for the sample taken on March 21. The change was made due to the discovery that the wrong base volume had been used. The corrected values are as follows: Isotooe Microcuries oer milliliter Xe-133 26.0 Xe-133m 7.9 Xe-135 3.5 I-131 0.025 CONTINUED

L;.;~L

._... =g _ =. _

... -.. ~.. Continued April 5, 1979 .Page 6 PNO-79-67X C,ontact: 0 Thompson, IE x28487 NCMoseley, IE x28160 Distribution: Transmitted H St Cnairman Hendrie Commissioner Bradford S. J. Chilk, SECY Commissioner Kennedy Commissioner Ahearne C. C. Kammerer, CA Commissioner Gilinsky (For Distribution) in Transmitted: MNBB P. Bldg J. G. Davis, IE fjh L. V. Gossick, EDO H. R. Denton, NRR Region I H. L. Ornstein, E00 R. C. DeYoung, NRR Region II j "[. J. J. Fouchard, PA R. J. Mattson, NRR Region III N. M. Haller, MPA V. Stello, NRR Region IV R. G. Ryan, OSP R. S. Boyd, NRR Region V H. K. Shapar, ELD SS Bldg (MAIL) W. J. Dircks, NMSS J. J. Cummings, OIA R. Minogue, S0 White House Situation Room (Handcarry ) EPA FDA/BRH 00E/EOC FAA FDAA For Distribution for PN0 - Three Mile Island (PNO-6'7--) ONLY Distribution: "~" IE (TMI) Site: (Provide copy to STATE) White House Situation Room EPA FDA/8RH 00E/EOC F00A/ FEMA BRP (State of PA) DCPA HEW Handcarry (FAA) Region I ix.c.;.. Region II - 74.; Region III .c_ Region IV ~ Region V 2.;. IMMEDIATE PRELIMINARY NOTIFICATION . se a

4-DR31T el N ' W> I!FF.01 ATE N ' P.41 LI11711 AP.'l NOT WICATIOt1 .%pril 6. 1979 Pl:ELIItIH;J.Y. liOEFIC2.'110E OF EVENT OR UNdSUAL CCCUIP2 HCL--INO-79-c7L Thin 5,rc11mJrtary noti ficatien ec,oct.itutes sur..n!arv lufnrnatien of an event of_ s afept o: puhyc intera::t si enf.ficca ce. The inforustion presented 1a _ a p33stary of _inf oretat1 on as of 7 :00 a.m. on 4/6/79.' ,M ilitv: Ihree Mile Is' land Unit 2 1-tiddletuun, Pennsylvania (DN 50-320)

Subject:

NUCLE /.R INCIII*NT AT TfDtEE 14ILE ISLAND Pltnt Status nn etor prencvre is cbout 1075 pni with bulk core coolant. inlet and outice temperatures at about 285 degrees F. Core thermocouple readings are re-latively unchanged and indicate a ma:cimum teuperature of 448 degreec F, well below saturation ton.perature for the present reactor proscure. iftree aku. thermocouple readings remain attac 400 degrecc F. Thirty ther=ocouples are being monitored. .d.a $'./, s I Contattment atmouphere measurements indiccte chmt 2*/. hydrogen. One } hydrogen recocbiner is in operation, with the second unit on st&ndby. 1 A IIeise pressure gauge, installe.d to provide an alternate method o' l ,menit;oring pressuriser level, has been unsatisfsetorily preosure teste. d (3oron-crystals indicata leakego from an elbov in the bypass line around the sample cooler). CONTINUED l i l l. I

4 Continued April 6, -1979 Page 2 PMO-79-67L

g. -4 Plans to von Mako-Up Tank (Mirf) or Waste Gas Decay Tanks (WGm) gases to o

contniment have been approved by the NRC. A val *Je operating prob 1cm hac deltred peaxMed WGDT venting. One saAsis of the tanks may be vented today, f.nviront intal Status Periodic ground icvel radiation curveys perfotued on April 5, 1979 by t.he NRC survey teams on the ecst and went sides of tt'c Sucquebcnna River froia a diets. ace of 4 uiles north to 4 miles south of TEI den eted radiation levcis avuaging icse than 0.01 iR/hr on the west ride cad frem 0.01 to 0.1'i ra/hr on the cast side. Prevaler.t vind direction dahing f.h1 day was from the vant to nortnves t. I AnMS surveys were performed on April 5,1979 at 0600, 09'50,1430,1515, 1649, and 2120 hours. The flights identified the plume in the doctor 110* to 130. The ciaxi.x.m radiation icvels were detected during the 0550 111'ht during thich icvals of 0.3 mR/hr were measured et 1 mile. B etue.en g 3 and 10 miles, the measured levels were frem 0.03 to 0.05 eP/hr.. The State of Pennsylvania reported data on milk, vator, precipitation end groos samples.. Ten milk sa::ples collected on April 4 and 5 detected rcdio-iodina ranging from 10 to 27 picoeuries por liter (pci/f..). Water samples . collected from five cities surrounding TMI from March 31, 1979 to April 4, 1979 detected icvels of radiciodine ranging from 0 to 12 pCi/{. Precipitation and graso samples for April 2 and 4 shwed no radiciodine. CONTINUED

Continued April 6,1979 Page 3 MiO-79-67L l Dose rates-in populated aroso as meauured by NRC thermoluminaccent dost-meters (TIDs) shewed only ctinor changes from the previous day. Minor fluctuations arc expected at those low de m -ates. Ton additional TLD stations at area schools, vero established -.. a,.ril 5 (u.aking a total of 47 stations). Following are the exposure rates for proviously reported locationus 1 Do;e nate_ _(Milliroontgag ocr iteur) (g/9 4/2/79 M3_/2 4[4/79 Mg F.1 mouth 0.15 0.01 0.20 0.04 0.02 Ml.ddletovn 0.04 0.01 0.02 0.01 0.01 Goldsboro 0.13 0.05 0.07 0.07 0.05 Goldsboro 0.04 0.02 0.05 0.02' 0,03 Levisberry 0.05 0.02 0.04 0.03 0.02 Pleasant Grove 0.04 0.02 0.06 0.01 0.01 York Ravcu 0.07 0.02 0.10 0.05 0.01 Conevago Heights 0.04 0.02 0.07 0.02 0.01 Emigov111e 0.05 0.02 0.07 0.02 0.02 Population Wmosuro Esnfmates Represuntatives from !!1tC. EPA and ilEW have toude estimates of the radiation doses to the public around IMI baned primarily on T1.0 data. The calculated r population dosa increment for 4/3/79 to 4/4/79 is 70 man-reme. The total cumulativa, 50 mile radiuo population dose since 3/28/79 is cotizated to be 2100 man-rems with an average dose to an individual of 1.1 millirem. The CONTINUED I s E .,_._,,,,,.,__,,.,r

April 6, 1979 Coutinued. FNO-79-67L Page 4 estimated ma:dmura doue to an individual.offsite (hypothetical, continuously present 0.5 mile NE of plant) is estimated to be less than 100 millirem. Industrial 'Jaste Traatment Sy s tem (Ik'TS ?, Industrial waste (other than nevago) discharge began about 3 a.m.j 4/3/79 at an average rate of 100 gpm tiith Iodine 131 radioactid.ty of 2.3 X 10 ' uci/mi ~ into the 58000 gpm cooling tower discharge to the river. The Unit i vaste evaporator condensate storage tank 10 also boing discharged. md the licensue han esiculated the release to the river to be about two-thirds the itPC for 1 continuous dis. charge of Iodine 131. O l',, l} M'1 9 9 \\

M @h. g n 1 .2. r. 1it C.i tt (19 U !! y 'I:7, Orl' Ci bl. f ?. 's, 7.) l% .ii.hll. AlCl NO JIFICAn(N 05 E\\ E:qT 01 tM JSUM. Od.U.utIIM1 --)'NO-79-f,7H '.' t

r. r.11taf n tr.v.wtifi c t.t:f oo c ea s. t i i v t.o r mec it y 1.rfoiwation of an

. vi? I o..' s n'et" or juMie inta rent s d o'til let.nce. 'dic 1 a ~orraat-icn t 11 v s v ecc. ,q,,c f u_,3g, o d in o rtw.t ie., at. of 7:G0 a.m. en 4/7/79. ur.i:it". Thrce d!.le Islard Unit 2 Itiddl e t tvn, oaursylvcuis (DN 50-320) inSieet: '!L C'I AR INCIDDIT N!' Tilf E21C12 IUI KW ~. s,....3 u t e.. N 2:T derent. ;c.t:urt ir. cla u - 1?rd pa. wit h br i.c c o m O c..l ua; f r. 3. ; t. :n.d. .itlet ur.opet a tt.rea a t about 285 cegrees F. At approxic act.17 1:25 p.in.

n April 6, reactor coolant piep 1A tripped end reacto. coolant pr=p 2A was started within about 2 minuteo.

After the change in operatins pumps, there was a shift in the core thermocouple readings. The three th:rmocouples t? bon: e o a with readings awe 400 F dropped to between 285 F and 315 F. The central thermocouple (position SH) reading changed frem 375' T to 455'F and is ncv 4G3e o %& F, the only reading above 400 F. Average temperature of th 30 thermo-couples b'eing cmnitored is-3R F. The boron concentration of the resceor coolant system is being increased from 2000 ppm to a target value of 4000 ppm. Vonting of Waste Gas Decay Tanh5 (UGDT) "A"4to the containment building was resumed at 9:15 a..n. on April 6 and stopped about 3:00 a.m. on April 7 r s s r edour'ff^f when the pressures. of WGDT "A" and "B" cropped to 32 and 30 psi 47 g -l',. f44 ve,t,c9 ~>v f,eee,,J, a 1. s / /., /n 3 e c.,,,,,,. 4 K $"I" "9_ 'j 7 4 [". # N N N,9 s > _. a. v /,,,,. c.*; I,, e, m e.,j,.y,; g s "3 %<h e p e a ri,g, l

Continued April 7, 1979 Page 2 pgo. /9-67M The diccharge to the river from the industrial waste storagg tank (IWST) was recumed at 6:15 am on April 6, 1979 at an average rate of 100 gpm. IWST level is now about 52%. Enuironmental Status Off-site radiation levels as identified by NRC survey teams continue to r ange be tween 0.01 -0.1 mr/hr. These routine survey results were obtained en the east and west cides of the Susquehanna River at distances of four =iles north and south of TMI. Prevailing winds during 4/6/79 were from e c 270 -300 (SSE). /2MS surveys uere performed ac 0700 and 1810 on 4/6/79. The surveys e o id2ntified a plume in the 120 -140 sector during both flights. The maximum radiation level identified during the 0900 survey was 0.3 cr/hr one mile from the site at 900 feet elevat'vn. The 1810 flight identified 0.05 mr/hr three miles from the site at 500 feet elevation. The State of Pennsylvania reported an 131 I level of 12 picbeuries/ Liter (pcill) for one milk sample collected on April 5, 1979. Pennsylvania's Minimum Detectable Activity (MDA) for this type of measurement is 10 pCi/d) for one smuple collected on April 4, 1979 and a second collecO=d on April 5, 1979. Airborne concentrations for 34 EPA samples collected between April 4,1979 d3 and April 5,1979 vere reported as less than HDA (1.8 X 10 uC1/ce). No new data regarding vegetation and. water s amples have been reported. CCNTINUED ] +

~ Centinued April 7, 1979 Page 3 FNO-79-67M Dose rates in populated areas as measured by NRC, thermoluminescent dositteters (TLDs) showed only minor chances from the previous day. Minor fluctuations i are et:pected at these low dose rates. Ten additional TLD stations at area schools were established on April 5 (making a total of 47 stations). Following-are the radiation dose rates for previously reported locations: ) l (Dese Rate (Milliroentgens per Hourl 4/1/79-4/2/79 4/3/79 M4/79 4/3/79 4/6/M Fsimouth 0.15 0.01 0.20 0.04 0.02 0.02 )

ftddletoun 0.04 0.01 0.02 0.01 0.01 0,01 Goldsboro 0.13 0.05 0.07 0.07 0.05 0.03 Goldsboro 0.04 0.02 0.05 0.01?

0.03 0.02 Louisberry 0.05 0.02 0.04 0.03 0.01 0.02 Pleasant Grove 0.04 0.02 0.06 0.01 0.01 0.02 York Haven 0.07 0.02 0.10 0.05 0.01 0.02 Conewage Heights 0.04 0.02 0.07 0.02 0.02 0.02 Emissv111e O'405 0.02 0.07 0.02 0.02 0.02 The ten TLD's located at schools also indicared radiation dose rates of 0.01 to 0.03 milliroentgens per hour. I / -W~ w ec.. 1 s e / <=

u n-+r

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& ' $ b d 4 h/)/ D r.)'t lC DeiEDIATE PM.LIMINARY UCTIFICATIOU April 14, 1979 PRELIEIM/M NOTIFICATION OF EVENT OR UNUSUAL CCCURRENCE--PHO-79-67U pis preliminary notificatien conntitutes sunmary information of an event of safety or public interest o_fenificance. The information presented is a c'mmsry of information as of 7:00 a.n. ou April 14, 1979. Facility: Three Mile Island Unit 2 Middletown, Pennsylvania (DN 50-320)

Subject:

WUCLEAR INCIDENT AT THREE MILE ISLAND --Plent status: ,-J At 1003 on April 13, 1979, cooldounjf the primary coolant system was initiated marking the first step fd placing the reactor into natural circulation. It is anticipated that the primary syctem would be cooled frcm 280 F to approximat.ely 230 F during this phase. As of 0200 on Aptil 14, primary coolant temperature had decreased to approxictately 250% ant had slowed considerably. Four of tho incore thermoccuplo p/("Gings re.aained abovo 300 F with the highest at 0 350 F. V [;,/ A prensurized primary coolant sample was taken on April 13 and is being sent to Idaho Falls, Idr.ho for analyse's by Allied chemical. The sample left Harrisburg at 0400 on April 14 and estimated time of arrival at Idcho Falls is 0945 EST. Envi Jnmental Status: Offsite radiation levels, identified by NRC uurvey teams, vore consistent with normal background levels (0.02 mR/hr. maximum). The results were ebcained from routine surveys performed on the east and west sides of the Susquchanna River at distances up to five utiles north and south of the site. By 11:15 a.m. on April 13, 292 local residents were scanned with the whole-body counter located in Middletown. Scan results indica' e no l radiation levels above normal body levels. - The following Aerial Measuring System surveys Eere conductee.s April 13. Wind Speed ranged from 14-16 MFH. No defined plume.;ss identified. l l . Time Max. Radiscion Level Distance from site 0908 - 0940 0.03 mR/hr 1000 feet i 1454 - 1530 0.03 mR/hr 9uO reet i

6 1-The iGC took a '.'4 -hwr air sanple near the obuervation center starting au 1600 hours on April 12, 19'/9. The results indicated less than 1.5 p'.coeuries per cubic m,ter of iodine-131. The.10 CFR 20 li: cit for iodine-131 is 100 picecuries per cubic meter. Dose rates (47 locatier.s) as creasured by NRC thermoluminescent dosimeters for the past 24-hoiar p<.riod of April 13, are near expected natural back-ground levels. ne State of Maryland reported finding icas than 6 picoeuries of iodine per liter of milk in 6 samples taken during April 7 to April 11. The mi.1h samples were taken from farms around TMI. p c.A J Sixty-two epa air samples col 1[cted on April 9:, and April 10, indicated no deccetable activity, t1'7h 1/six indicated ac.7tivities which ranged from 0.092 to 0.81 picoeuriact:r of I-131. EPA sa::ples of milk, soil. vogeta-t!.on, water e.nd various species of fish did not reveal any activity above bcckground. "g DOE ostimates of e:: terr.a1 cxposure to the population within a 50-mi radius of Three Mile Island for the period !ft.rch 28-April 3 arc about 170 peroca l rems. This est wate ir. believed to be conservativo. The exposure # decreased 7 ..> wg4<Ry during the second week (April 3-10) to about 50 parsou-roc:s. A i / masinum exposure of 95 ctilliremo is estimated for n hypothetical peroon l ,Mgb who remained outdoora near the bank of the Sus'quehanna, east of the Three / i Mile Island station for the entire week following the incident. The / uncertainty associated with these population exposure estimates is /

2 5 '/..

j w j Correction to PNO-79-6/E dated March 31, 1979. The initial report of licensee ILD data was b. sed on a telephone report. The follouing is f based on tho TLD vendors fernal report. The fiirst quarter 1979 TI.D readingc ranged froci background to a high of 1044 mR at the licensee fence in the mm sector. he hi;; hest reading ;fLD located in an offsite populated area was about 26 cm of which about.15 cs was backgreund e::posur e. A TLD located midway across the corph bridge about 0.3 miles NIT 2 of the plant recorded 44 mR including back, pound. These revised octimates do not si,niiiicantly affect previous! estimates of population t doceu. I 1 i e -y-... a

l 1 IMt1E01 ATE PRELIMINARY NOTIFICATION- - ) April N, 1979 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -PNO-79-67U ibis preliminary notification constitutes summary info'rmation of an event of safety or public interest sianificance. The information presented is a summary of information as of 7:00 a.m. on April W,1979. is' Facility: Three Mile Island Unit 2 Middletown, Pennsylvania (DN50-320) f

Subject:

NUCLEAR INCIDENT AT THREE MILE ISLAND p:: O Plant Status: L- [ k g g "2LR Cf4 4

J w sn vD 27w A

5 /( 0 h cw J ks N/c' T etiAlt.a*w-As of 0200 on April 15, primary coolant temperature had stabilized at 250 degrees F. 'Four of the incere thermocouple readings remained above tha 300 degrees F with the highest at 3k8 degrees F. A preliminary evaluation was made by the NRC staff of core and plant data obtained during the first 12 hours of the transient. The evaluation indicates there xram were three periods during which portions of the fuel were coiled by steam. Normally the fuel is cooled by water. From ana)yses of fission product and hyriregen releases inside the plant and radiochemical analyses of the reactor coolant water, damage.to the fuel was estimated. These analyses indicate that severe cladding oxidation accurred and that most, if not all,. fuel rods have some damage. This damage resulted in embrittlement of the fuel zirconium alloy components and subsequent loss of stneturall integrity of the fuel in affected regions of the core. The preliminary conclusion is that there is a region of extensive structural damage to the fuel, probably confined to the upper central to per cent of the fuel tecrperature durir4 the core. The transient is estimated to be well below the $100 degrees F fuel ) g melting point. Max The lower and peripheral portions of the core are its believed to have retained their basic structural integrity. 1 l e. j

~-.. Environmental Status: Offsite radiation levels identified by NRC survey teams were consistent with normal *,4ckground. levels (0.02 mR/hr maximum). The results were obtained from routine surveys performed on the east and west sides of the Susquehanna River at distances up to five miles' north and south of the site. By 81: 3 0 a.m. on Ap ril l'f, 1979. 3751ocal residents were scanned with the- ~ whole body counter located in Middletown. Scan results indicate no radiation levels above nomal body levels. The following Aerial Measuring System surveys were conducted on April 14. Wind speed waf v*ete b le. ne pc.mple t r, t,/s is Ac,- / T L M Max. Radiation l'evel Lhe Distance from Site ll3 3 - 1111 'O.CVmR/hr 2 788 1000 feet The NRC took a 24-hour air sample near the observation center startirg at 1600 hours on April 14,1979. The results indicated less than 3 0 picoeuries per cubic meter of fodine-131. The 10 CFR 20 limit for iodine-131 is 100 picoeuries per cubic meter. Oo'se rates (47 locations) as measured by NRC thermoluminescent dosimeters for the past 24-hour period of April 14 are near expected natural back-ground levels. A pressurized primary coolent sample was takean April 13 , 1979. The six highest individual dose was 270 mrem. individuals involved receive The i l .S

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p ,yfg l_o : G. C. G o we.r 'w I: yi is % IHt2DIATE PRELIMINARY NOTWICATION $.*O$ Ct.M. PPILIMINARY NOTIFICATION OF EVENT OR UNUSUAL 00CUFJENCE--P.40-79-67V 'Otis preliminary noti f_icatien constituten str.sna v inforriation of an event of safecy or public jnterest ni gni fic anc e. The inforsation presented in a su' unary of infotriati on as of 7 :00 a.m. on April 15) 1979. Facility: Three Mile Island Unit 2 Middle totm, Pennsylvania (DNSO-320)

Subject:

NUCLE /J1 INCIDENT AT THREE MILE ISLAND plant Status: As of 0600 on April 15, 1979, primary coolant tcmperature had stabilis:ed at approximately 250 degrees F. 1?our of the incere ther:noccuple readings rc=ainst above 300 degrees F with the highest at 348 degrees F. The hydrogen recombiner that failed on April 13 has been repaired and is in the process of being restored to service. The staff has completed a preliminary evaluation of TMI-2 fuel damage. Examinations of data from core thermocouples, incore detectors and excore ion chambers, and analyses of core parameters such as primary coolant prescure for the first fif teen hours of the transient show several periods.of significent core uncovery. There were timo periods X during which portions of the fuel elements were cooled by steam rather than prescurized water which is the normal cooling method. It was during these periods of deficient cooling that extensive dcmage { co the fuel elementa occurred. This damage occurred pri:tarily by ) oxidation of the fuel cladding and other zirconium alloy components, i which were embrittico and lost structural integrity in come regions of the core. Estimates of the extent of dauage were calculated frca fission product and hydrogen releases inside the plant and radio-chemical cnalysis of the reactor coolant water. The analyses indicate that significant cladding oxidation occurred in the upper regions of the core and most fuel rods have some damage. The core geometry in the upper regions of the core, especially near the center, is believed to be severely distorted due to loss of fuel cladding integrity in that region. However, the lower and peripheral portions of the core are believed to have retained their basic structural integrity. The highest fuel temperature during the transient is estiaated by these damage mechanism analyses to be well below the 5,,10@ fuel melting point. Previous results of radiochemical analyses of primary coolant samples support this ccuclusion of little or no 0 fuel melting. 3 ,__,_v v-.

~ j ( l .. l I Environmental statua i Offsite radiation icvels identified by NRC murvey teams were consistent with normal background levels (0.02 mR/hr maximum). The results were obtained from routine surveys performed on the east and went sides of the Susquehanna River at distances up to five miles north and south of the site. I By 9:30 a.m. ca April 14, 1979, 375 local residents were scanned with the whole body counter located in Middletuwn. Scan results indicate no radiation levels above normal body levels. Tbc following Aerial Measuring System surveys were conducted on April 14. Wind apeed was variable. The principle isotope is Xe-133. Time Max. Radiation Level Sector _ Distance from Sito 1138 - 1221 0.04 mR/hr 270 1000 feet The NRC took a 24-hour air sample near the observation center starting at 1600 hours on April 14, 1979. The resulta indicated less than 3.0 picoeurica per cubic meter of icdine-131. 'Ibe 10 CFR 20 limit for iodino-131 in 100 picocuries per cubic meter, d. Dose rates (47 locations) as measured by NRC thermoluminescent dosimeters for the past 24-hour period of April 14 are near expected natural back-ground levels. M, A pressurized primary coolent sample was taken April 13, 1979. The six , individuals involved received a total radiation dose of 800 mrem. Ihe higheat individual dose was 270 mrem. During the period of 1600 hourc on April 13 to 1600 hours on April 14, DOE collected and analyzed the following samples: Number /Ty.pe I-131 MDA Wsesow**e* f&b, &d4l%*$k' y x,s-i feH!PB M .0 4 na.wowdu 44Ie 4 Water %iff 0 4 Vegetation 3 49=+2,uCi/M 4 Air (3 ground level J xio** mo ss $~# !'O. '* M "* and 1 helicopter) __.12 Total All water, 3 vegetation, and 1 ground level} air camples indicated less , than MDA for I-131. One vegetation (grass)' aample indicated 0,16 nanoc'uries/ square meter I-131. Two ground;1evel air samples (collected at the same location and time side-by-side on April 13 at 11:45 a.m.) indicated I-131 levels of 9.5 picoeuries per cubic meter. The air sample collected via helicopter at noon on April 14 indicated an 1-131 sctivity of 119 pecesh. The 10 CFR 20 limit, for I-131 in 100 picoeuries i per cubic meter. 'paQuea[cuain 4 i 1 L

o I ~ -3 i i s l Tba cause of this increase in rMioactivity in certain environraental saraples is not kncvn but is under investigation. It is possible that the increnzo is the result of the r.acoat change-out of the charcoal filters. ) I i i - 1 l l l l l t i l I l I

t DfMEDIAIT PRELIMINARY NOTIFICATION April 10, 1979 PRELIMINARY NOIIFICATION OF EVENT OR UN SUAL OCCURRENCE --PNO-79-67Q 21s preliminary notification constitutes sunnary fmformation of an event of safety or public interest significance. W e information pre-sented is a summarv of information as of 6:00 a.m. ion 4/10/79. s facility: %ree Mile Island Unit 2 Middletown, Pennsylvania (DN 50-320)

Subject:

NUCLEAR INCIDENT AT THREE MILE ISLAND Plant Status _ Bulk coolant inlet and outlet temperatures remain at about 280 degrees F. - The average core thermocouple temperature is aboutl 295 degrees F, and the highest thermocouple reading (8H) is about 400 degrees F. l A 24 hour period of additional degasification by reducing primary pressure to 400 psig in small decrements was completed on April 9. No significant change in reactor coolant pump vibration occurred during this period. Noise measurements did indicate some gas in the coolant !at lower pressures, with returd into solution over time. The licensee pla'as to repeat the degassing operation, cycling down to approximately 300;psig,l and subsequently to hold zeactor coolant system pressure at approximately 1000 psig. A phased cooldown is under consideration as the next step. A primary coolant system sample is planned to be taken this morning. I Rydrogen concentration in containment is about 1,77.. 0442-Wi /Ti Tkim H e CCse +o b3 ped M f i M el[e a~ A (62pphv lwe wcwm0 L QG

PAJ, l

i. 1 )

i g i l Continued l April 10,1979 9 age 2 l. PN0-79-67Q ENVIRONMENTAL STATUS Offsite radiation levels identified by HRC survey teams range between ~ ,,Thejigher levetl lasted only a short time and ep rdirkeld J to be L( gR .024-m -.gropar operation oCw*hste gas compressors. The results were obtained from routine surveys performed on the east and west side of the Susquehanna River at distances of up to 4 miles north and south of the site. The; following ARMS surveys were conducted during April 9,1979: TIE. HAXIMUM LOCATI N DISTANCE FRON SITE ,i RADIATION LEVELS l 4 12:08 - 13:08 2 mR/hr sector l235 -270 1 mile 18:h5 - 18:45 1 mR/hr ser. tor l 120 1 mile No pew data were raported for milk, water, and; vegetation samples. Offsite dose rates as determined by NRC thermoluminescent dosimeters' (TLDs) indicate that present radiation levels are in close agreement with expected natural background levels. Dose rates in populated areas (47 locations) as measured by NRC thersnoluscant dosimeters have ranged from 0.011 to 0.05 milliroentgens i per; hour for the past 24-hour period of April 9

Contact:

EJordan, IE x28180 NCMoseley IE xh8160 Dis.tribution: Transmitted H St __ } Chariman Hendrie ComissToner Bradford

5. J. Chilk, $2CY CogissionerKennedy Comissioner Ahearne C. C. Kamerer, CA (For Distribution)

Transmitted: MNBS P. Bldg J. G. Davis. IE L. V. Gossick, E00 H. R. Denton, NRR;! Region I H. L. Ornstein, EDO R. C. DeYoung HRR Region II J.'d. Fouchard, PA R. J. Mattson, NRR Region III N. H. Haller, MPA V. Stello, NRR Region IV R. G. Ryan, OSP R. S..Boyd, NRR Region V H. K. Shapar, ELD 55 tildg (Mail) W. J. Ot rcks NMS5 J. J. Cumings. OIA S. Lavine, RES l R. Minogue, SD CONTINUED k i i

Te' '. Thh ( 2.Si be !p 7M ! i$ I.MMEDIATE s FRELIMINARY NOTIFICATION April 12, 1979 1. ,s PRELIMINARY NOTITICATION OF EVENT OR UNUSUAL 00CURRENCE--PNO-79-67S { This preliminary notification constitutes s"-=l y information of an event /e of safety or public interest significante. Wei information presented is a l I.' g; wary of 1.nformation as of 7:00 a.m. on April: 12, 1979. 3 Faciliev: Three Mile Island Unit 2 u T Middletown, Pennsylvania (DN 50-320) o} b

Subject:

NUCLEAR INCIDENT AT THREE MILE ISLAND f g Plant Status I.f ts Bulk coolant inlet and outlet temperatures remain at approxinately 280 g i,Ng g degrees F. The peak core thermocouples remain liess than 400 degrees F ( I1 with the exception that one themoccuple read 4Di*F during reduced %7 pressure operation. \\ The degassing operations were completed at about 0115 on April 12, 1979. I The minimum reaccor coolant system pressure was, 303 psig. Noise analysis evaluations indicate considerable degassing too,k place during these opera-s tions. Pressure is being returned to about 1000 peig and will be held at that level. k A second pressurizer level measuring channel failed at 2045 on April 11, 1979. There is one original pressurizer level' channel still operating. - Calibration of the Reise pressure gauge (backud level indicator installed % LMs several days ago) is planned during the current: increase in pressure; it is expected this will provide an A =-- r meth'od of monitoring pressurizer level. ,g,/ Cooling water flow was restored to the coolers,in the containment at 0730 on April 11, 1979, and the containment temperatures have decreased from about 93 degrees F to about 85 degrees F. The' hydrogen concentration in containment is about 1.67.. Preliminary results of the primary coolant samples analyted*at Oak Ridge and Savannah River have been received. Very if ttle uranium was identified i in either sample. s frow +,ln r*J4 7sdif r% -

je eeevt m.,

u,;, >., n a s a > wy -vv es, 'd 7 a CONTI1NED ~ PJ g a r p v$rijYAY'=) Q G UN$ P W) AW I i

l Continued April 12, 1979 Page 2 PNO-79-67S Environmental status Offfite radiation levels identified by NRC survey teams range between 0.02 and 0.1 mR/hr. The radiation levels continue td be lov. The results were l obtained from routine surveys perforn.,5n on the east and vest sides of the ~ Susquehanna River at distances up to five miles ! north and south of the site. Between ;.!800 and 2130 hours on April 11, one hun l dred fif ty-five local residents verr scanned with the whole-body countier which was set up in Middletown. La scan results reported do not indicate radiation levels above normal body levels. Over 650 individuals 'have signed up to be scanned. The following Aerial Measuring System surveys were conducted on April 11.' These were previously reported as ARMS surveys. Winds were calm during j these surveys. I l Time Max. Radiation Level Distance from Site 0917-0452 0.025 mR/hr 1 mile 1700-1735 0.010 mR/hr 1 mile I The. State of Pennsylvania reported that an air sample taken at the observation center from April 2 to April 10 ind$cated11,4 picrocuries per j cuble me:er of iodine-131. The NRC took a 24-hour air samp1h near the i obsirvation center startin at 1600 hours on April 10 1979. The results indicated 1.6 picoeuries per cubic meter of iodine-131. The 10 CFR 20 limit for iodine-131 is 100 picoeuries per cubic meter. l TVo. milk samples were collected by NRC on April,11. Both had less than { ' " - - :' ' -- _. Z " 30 picoeuries of ioding,-131 per liter. M ej 4_ 2 Q s m A. m : 1D y:-_f L tz e83 .sa p. w&, bCE' collected samples from 1600 hours on April 10 to 1600 hours on April l Il and analyzed for fission products with e=pha61s oc radioactive iodine. Results are: 3-w '] 12 vater samples - less than minimum detectable activity (MDA) of 54.-93 picoeuries per cubic meter. CONTINUED i I i I I 9 a

Continued April 12, 1979 Peg 2 3 IHO-79-67S d 7 vegetation samples - less than MDA of 0.03 p//anocuries per cubic meter. - less than MDA of 0.6 ga/ A

4. scil samples nocuries per cubic meter.

I air sample - 21 picoeuries per cubic meter. (Sampled in diftaned plume near plant.) Dose rates (47 locations) as Sv$E measured by NRC thermoluminescent dosimeters. have ranged from 0.01 to 0.03 milliroentgens p6r hour for the past 24-hour period of April 11, 1979. These icvels are id close agreement with expected natural background levels. The State of South Carolina, Bureau of Radiological Health, issued an order which prohibits Chem Nuclear from receiving waste from 'DfI Unit 2. Ibe order was signed by the Governor. Two trucklo'ade of wasta enroute to Chen Nuclear were returned to TMI. .W 'At 0100 hours on April 12, 1979, two tanks previously used as temporary storage for Unit 2 condensate storage tank overflow left the site for New and sample results from one truck indicated le;vels of radioactiv Jersey to undergo some repair work. g( uct/mi grossg 5thile the truck drivers had obtalmed property releasee.for [ the Unka they had not obtained radiation safdty releases.Shortly after % y the trucks departed the site, theerrorwasrelalized. At the request of l ,g .f the Unit 2 Ghift Supervisor, NRC personnel contacted the Pennsylvania State / I

--?g _[ pglice and the truck from which the high grossT/ activity sample was obtained was intercepted about 5 mires outsidFo~fWrislurg and escorted back to the

'g:s:5~ site where it arrived at about 0300 hours. Th'e returned tank was surveyed d and no leakage or external radiation levels were, detected. A sample of the 77 tank'.s residual liquid contents was taken and l1s being analyzed. 'Ihe licensee I , ge,. is making procedural revisions to prevent recurrence of the problem. Corrections PNO-79-67N, dated April 8 - Item b on page 3 listed the MPD for iodine-131 as 100 picocuries per liter. It should have read 300 picoeuries per liter. PNO-79-67R, dated April 11 - On page 2, thle ARMS results were listed as 0.15 mR/hr for the 1833 to 1913 survey. I.t should have read 0.01.5 mR/hr. Also the ARMS surveys were described as be!ing in sector 310* for the 0627 - 0800 survey and in sector 340' for the 183[3 - 1913 survey. It should have read 130' and 160'. respective'y. / I l l

l IMMEDIATE PRELniINARY NOTIFICATION April 13, 1979 PRELIMINARY NOTIFICATION OF EVENT OR INUSUAL OCCURRENCE--FNO-79-67T l This preliminary notification constitutes summary informatinn of an event of safety or public interest si gnific ance. The information presented is a summarv of information as of 7 :00 a.m. on April 13, 1979. i Facility: Three Mile Island Unit 2 l Middletown, Pennsylvania (DN 50-320)I i

Subject:

NUCLEAR INCIDENT AT THREE MIII ISLAND' Plant Status Bulk coolant inlet and outlet temperatures remain at approximately 280 degrees F. The peak core thermocouple readings have declined to below 385 degrees F. The primary system pressure is being maintained between 950, psig and 1000 psig, i There are presently two of the three original pressurizer level channels in operation (the pressurizer level indicator that was reported to have failed on April 11 started to function again at 1955 on' April 12 and has been tracking reasonably well). Calibration of the Heise pres'ure gauge is in progress. s A differential pressure sensor is being installed on the pressurizer instrument lines in an attempt to provide an additional method of monitoring pressurizer level. The hydrogen recombiner tripped off at 0115 on April 13 (burned out heaters). The hydrogen concentration in the containment building was about 1.5% at 2200 on April 12. A decision has not been made whether to replace the heaters or to initiate operation of the backup recombiner. i Environmental Status The maximum offsite radiation level identified bh NRC survey teams was 0.02 mR/hr. The results were obtained from routine surveys performed on the east and west sides of the Susquehanna River at distances up to five miles north and south of the site, j d i By 4:15 /.m. on April 12, 214 local residents were scanned with the whole-body counter which was sat up in Middletown. The scan results reported do not indicate radiation levels above normal body levels. i I CONTINUED' i { i l 9

o Continued April 13, 19.79 Page 2 PNO-79-67T The following Aerial Measuring System surveys were conducted on April 12, Winds were calm during these surveys. Time Max. Radiation I,evel Distance from Site 0934 - 1016 0.03[mR/hr 1 mile 1510 - 1603 0.01 mR/hr 1000 feet The NRC took a 24-hour air sample near the observation conter starting at 1600 hours on April 11, 1979 The results inoicated lless than 2.2 picocuries per cubic meter of iodine-131. The 10 CFR 20 limit for iodine-131 is 100 picocuries per cubic meter. Dose rates (47 locations) as measured by NRC thermoluminescent dosimeters for the past 24-hour period of April 12, are in close agreement with expected natural background levels. Samples of air, water, soil and vegetation continue to be analyzed by Federal agencies. DOE reported the following positive results: l 2 of 30 vegegation samples yielded 80 and l260 microcuries per square meter (ugi/m)todine-131. The minimum detectable activity (MDA) is 30 wCi/m. The remaining 28 sampieg were ' elow MDA. 12 soil samples b were less than the MDA of 600 uCi/m C, All air and water analyses by DOE and EPA vero less than the in 10 CFR 20. Exposures of Met Ed and Contractor personnel from March 29 to April 11 are: Dose Range (Whole Body Ganna) Number in Range 100 - 250 mrem 118 251 - 500 mrem 25 1 501 - 750 mrem 12 751 - 1000 mrem 2 1000 - 2000 mrem 3 2000 - 3000 mrem 0 3000 - 4000 mrem 3*

Reported in PNO-79-67K I

I 4 I i i I w r-r e e--v-

-af IM EDIATE ~~ ~P::FLitr1NA!;Y NOTH'ICATION April 18, 1979 l PALLUIINARY NOTIFICATION OF EV124T OR UNUSUAL OCC, NCE -- PHO-79-67T _Tip preliminary notification constitutes st.neary 16 formation of an event of safety or public interest significance. The information presented is a s ur. art.ry of information p.s of 7:00 a.m. on ADril!18. 1979. I Facility: Three Mile Island Unit 2 ~~ Middletown, Pennsylvania (DN 50-320) i

Subject:

NUCLEAR INCIDENT AT *1HREE MILE ISLAND l P1a,,_ t S tatus _n The average primary coolant temperature is 236 degrees F. The decrease in j primary coolant temperature was a result of an ir.crensa in the steaming rate. This increase was achieved by opening edditional valves to the main condenscr. l Two of the incore ther:nocouple readings remain above 300 degrecs P with the hit.,h e s t at 330 degrees P. i As of 0530 April 18, fif ty cf 90 charcoal filter elements in train A of the A:n:111ary Building Ventilatie's syctem have been replaced. 'Ihis work began on April 12. Pressuri::er level transmitter LT-2 became erratic over the period 1745 - 2235 on April 17 but is now tracking again. Calibration nf the Heise gauga, to be used as a backup pressure level coacurement, is cuatinuing. ) Eaviron:nent Status j Offsite radiation Icvels identified by NRC survey tcama were consistent with normal background levels (0.02 mR/hr. maxir::um). These rer.ults were obtained from routine curveys performed downwind,on the east side of the Susqwt.hauna River at distances up to five miles north and scuch of the wite. By 2:15 p*.=. on April 17, 632 local residents had been scanned with the I whole body counter located in Middictown. Scan results indicate no radiation levelu above normal body levels,Ana t TliI m _-S =.__ No Aerial Measuring System ( AMS) survey was conducted en April 17. Ucwaver, i ,;mG AES survey was requested by NRC based on a shcrt lived ifieresse in the iodine discharge rate between 3 and 4 a.m. on April 18. The AMS survey ) recults are not yet available. The NRC' measure:nonts are provided in the l follocing paragraph. 4 ,r,

d _ i 1 1 During the 24-hour period ending midnight; April 17,1979, *of 12 air samplese showed no activity above the minimu:n detectab1'e agivity. ou,/3 A, 9: : 5--/ .4 - _ ~=g e. ^ b todine-131 use greater than 1 x 10" uci/cc T ] of three samples showed iodine 131 concentration of 2 x 16"g, icrocurios/ q (100,picoeuries per cubic meter). On the morning of April 1979, one m 11111ted(2O4 cm-~ies per cubic meter) during the_pgried of 3 to 4 a.m. r .ie re=af ning two sample _sp were approximately 3.u x 1U- _microcuries/ ~ miheqr (50 picoeuries/ cubic meter). The la sample analyzed covered the perf od 0420 to 0527. The cause of the hi ading is believed to be due primarily to meterological conditions; how cr, several in-plant events were cleo in progress. They are being analyzed for possible contributions to thin readimg to determine appropriate correctivoqction. One grass cample taken dounwind of the plant showed 6.13 x l10 microcuries per squaic meter (613 picoeuries per square meter). ! Additional milk and veger.etion camples have been taken, but have not been analyzed. Dose racca (47 locations) as uessured by NRC thermoluminescent dosimettre (TI.D's) for the past 24-hour period of April 18 are near expected naturni background levels. Iodine concentrations ceasured in the Unit 2 ventilation stack since PNO-79-67X (April 17, 1979) are: Tire Activirv (uC1/ml) 4/16 (?356) /1 (0402)

1. 25--J f /0 A/(7 (04223 - 4/17 (0803)

1. 2 2-t x e o-7 4/17 (0803) - 4/17 (1226) 1.4 2-t y t o-I 4/17 (1226) - 4/17 (1634) 1.3 E-t g/o"7 4/17 (1640) - 4/17 (1946) 2.3 E@ r /0 ~I 4/17 (1958) - 4/17 (2357) 2.1 E-7 y / e - 7 The URC took the daily air sa nplo near the obser acion center starting at II47 'cn April 16 mid ending at 1620 on April 17.

Analysis of this cample iudicated that the concentration of Iodine-131 during the appro:ri. mate curies // period averaged less than 2.4 x 10-12 23-hour uci/cc (1 css than 2.4 pico- ). The plume wind was not in this sector a large parecatage of the tim 4 du; ring the.smnpling period. ),,, J.Z. W y .4 F #f tW AJ j c No usu'/ DOE.. EPA, iM or Coeuronwealth of Pennsylvania, LER Jer_ - -; i / i The Congnonwealth of Pennsylvania has been informed of these results. l i e i i

=- f W e. It1A1.0 LK) E IM:LTHINARY HOTIFICA'] TOM April 19, 1979 P.ubImHAltY NOTIFICATICI{ OF EVENT OR UNUSUAL OCCURRENCE - "PNO-79-67Z Thir prelitninnry notificati<m constitutes suaaary infor. cation _ of an event orjafety or public i.ntyros;: sigifi c anc e. The inforreation procented is,3 suary of infotmation as of 7:00 a.m. on April _.19, 1979. Fae,ility: Titree Mile Ir. land Unit 2 Middictcun, Pennsylvania (DN 50-320). S_ub,j ec t : NUCLEAR INCEENT AT '111REE MILE ISLAND i Pljgt Status Tim averate primary coolant temperatttre ir. 235 degreco F. Preparations 4.ru being made to further decrease coolant temperature by admitting steam to the mnin ec.tdensor through the u.ain turbine. Two of the incore tliermocottpin roidings remain tibove 300 degnec F vich the higheat at 329 degreus F. Roplacement of the charcoal filter elements in train A of the Auxiliary Building Ventilation systo.m is expected to be cpcipleted this morning. Pecoperational teste of train A vill th:n be cortducted, t Pressurizer levol traormitter LT-2 failed at 11;30 p.m. on April 18. Oclibration of an altcimate mothod to be used an a bachvp pressure level meccure.ncnc is centinuing. A prcrsurized primary coolant saicple was taken hc 9:45 p.nt. on April lu,1979 and anne to BW, Lynchburg, Va. for anhlysis via a National onard Aircraf t eat 11:35 p.m. I, Envi:'pey3:3t Status ) offsite radiation levals identified by NRC curvdy tea.no were coanistent wits neemal background levels (0.02 o.R/hr/maxiinm). These results were j obtained,frce veutine surveys perfonied do n. wind on the east nide of the j Susquehcona River at distances up to five iniles jnorth and south of the nits. By 7:00 p.m. on April 18, 721 local residents h d been actained with the whole body counter located in Middletown. Scan ;results indicato no 'rsdiation it.vals above normal body levels duo eq Tm operations. The ucaaning of local residents has been terminated.; An Aerial Measuring System (AMS) survey van conducted beginning at 6:30 a.n.. on April 18, 1979. A plume readin 2 =hd;-- %:: vas identified 0.25 miles SE of the plant sud followc to1.5ctiles.j Spectral analysis indic.ite.1 m A/r t e 9 M

=e cl. .s. g '33 i h i p ee reace v1 :sc twe--rb. Og ai r ua aplu t at.cn j u t.he pr.as 2vo metecy

, = oL-- A sL *cd 0.6 x 10 nicreenrin, por cubic centister of J o hne 131 (Su picoeuriec pai cubic recter).

s 4% M j... aGa.,,/ /m a Du.rsng_ the period from,35f 30(.ppril 18 to h530 : April 19,0 of 6 ir W un y.lcPshwed no activity abcvc tbc min 4unm detac. table activity (HDA). S h s meteorologic*' conditions during thiu perical ware more f avorable The fcutith sac pie s.hws a Icdine-1W )' 1.h's thoec of the previous doy/cc (27 picocurics h met 5).Ihree ac co$ cent. ration of 2.7 x 1011 uc Data troas r.c.ter s caples have not as yet been t.nalyzed. tir.:ce grass sumpics'showed no activity above the MDA. (1he hDA for gr..co was 2.4 x 10'i microcuries per squarc meter (240 picoeuries pc:: square mater); the MDA for poil was about 3.7 x 10-7 microcuries per tr u {0.37 picocuries per grrun). One grass sic:ple, tsken shoued 5.5 x 10' 4 t:ierocuries per square meter (550 picpocuries per square meter). Do ;e rates (47 locations) as mensured by NP.C t$ermoluminescent desitrett ra (T.:.D's) for the past 24-hour period cf x.-il 10 are near expected natura) background levels. 1oline coacentrations mar.sured in the Unit 2 ventilation stack since 1Go-79-67Y (April 18, 1979) cre: Ti.ne Ac tivity (uci/u1L 4/17 (2357) - 4/18.(0405) 2.2 x 10-/ 4/18 (0405) - 4/18 (0550) 4.5 x 10-7 A/18 0550) - 4/18 (0300) 2.1 x 10-Z 4/18 ((0305) - 4/18 (0945) 1.8 x 10 ' 4/18 (0945) - 4/18 (1200) 1.4 x 10-7 4/18 (1?.04) - 4/18 (1647) 7.2 x 10"8 4/19 (0C01) - 4/19 (0355)* 7.5 :x 10-8 W NttC tock the daily air sc=ple near the obucrvation center startin3 at 2000 ou April 17 cnd ending at 1600 on April 18. Analysis of this sauple j udicated that the concer.trat. ion of Iodine-131 -during tnc approximate 24-hour period averaged less than 2.6 x 10-12 microcuries per millileter (lors thr,m 2.6 picoeuricofcubic meter) e i PDA reported that 64 adrtitional milk scmples collected through April 15, 1979 were analyzed and none coatained Iodine-131 above the MDA (approximately 15 picoeuries per liter). l 1 EPA submitted airborne iodine analyses of air amnples colid'cted from 31 stations on April 12 and 13. Nincreen of the sauples were reported to have positive seasurements of iodine-131 from 7.2 x 10-14 microcuries pe2 cubic contimeter (0.072 picoeuries per cubic uotor) t'or a location 25 ri'.cs vest of the plant to 6.6 x 10-13 microcurice per et.bic centimeters l (0.66 picoeuries per cubic meter) at a location about 5 miles urtst of the pinnt. EPA air samples collected on April 14 showed positive Iodine-131 c,n.6 l

The nt&kgonitor used fc,r these measurements was out of service frem 22:00 e....

Ch P" to 12:00 p.in. April 18,.1979. 1 s

a J4 4LW 1-J m-o .= i. I ! ra 7.#/ n 10~33 tf th 31' ca 1picu ulik 1 !a.to "f l.S 2 10~ t ia' ct octei s..J p er" it le i.u.it.iw;t er (0. A 5 tt 0. 71 r iecaries pea cubic cat.or). EPA 4 44 u eplen colle ct: d on t.pzil 12,13 and 14 frat 9 1Nr.tions t etc 'Jues th.a h,lk 4 tid 4 (10-15 pleecut ies p2r 1.it er). Eoli anc v: getattuo niep'ics ec1.lected cn / p:11 11 cho,td nr. activi ty abr.vc bac1.trovad.' C a (pr$ 1 18, ducirg a tori h3 HitC pc rounnel of dill Islexid, ed )sicent 1 o SMI, thic: pert.cas weste et acrvec. Two of the perscos repcrted that th;y hnd been en 11111 Islend on Ms ch 28-30, 1979. An evaluction of t htf r czpocuen is in prot ress. One of tha three has circady bacn co tnted in the v'aole bcdy countur in Middictmm. ') h t Covatom es11.h of i>cuar.ylvenia han beca infoi. nod of these resnita. e i i 1 1 0 / T 1 I i ( I

i 1

)q'p)f T (Ap%

is J o&T'c ML IMMEDIATE PRELIMINARY NOTIFICATION April 24, 197 > PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL. OCCURRENCE - PNO-79-67AE I This ornltrinarv notification constitutes summary information of an event of safety or_public interest s i_gni fi c a nc e. Tne information presented is a suianary of_ information an of 7 :00 a.m. on April _ 24 1979. I Facility: Three Mile Island Unit 2 4 Middletown, Pennsylvania (DN 50-320) l gubject: NUCLEAR INCIDEffr AT THREE MILE ISLAND Plant status i The average primary coolant temperature is stillbeinkmaintainedat 175 degrees F by admitting steam directly to the main condanner through the main turbine. The highest incore thermocouple reading is 271 degrees F. The charcoal filters in Train A of the Fuol Handling Building Ventilation System have been replaced. This train was placed in service at 6:30 a.m. April 24, 1979. Twenty-eight of 90 charcoal filter 4 lin Train B of the Auxiliary Building Ventilation System have buen replaced. Environmental Status, l 1 One Aerial Measuring System (AMS) survey was made between 10:15 p.m. s'nd 11:15 p.m. on 23 April 1979. No radioactivity abovo natural background was detected. Iodine concentration at Unit 2 ventilation estack (Ana ysed by NRC Mobile Laboratory). l Date/ Time Activity (uCi/ce) 4/23 (0007) - 4/23 (0406)+ 6.7 x 10-8 4/23 (0407) - 4/23 (0758) 5.9lx10'O 4/23 (0801) - 4/23 (1201) 3.6 x 10*8++ 4/23 (1223) - 4/23 (1614) 1.4 tx 10~74+ 4/23 (1617) - 4/23 (2010) 6.3'x 10*8 4/23 (2014) - 4/23 (2156) 5.7:x 10-8 4/23 (2159) - 4/24 (0001) 5.9lx 10-8 4/24 (0004) - 4/24 (3404) 4.9ix 10-8 l Mhis entry wau incorrectly reported in PNO-79-67Ah, % ese are licensee contractor values. l I C0f(IINUED IMMEDIATE PRELIMINARY NOTIFICATION I t 1 i a e

- -~~~ j 'w j s Continued 8 April 24, 1979 Page 2 PNO 79-67AE i Of fair 3 Heasuremanen Radi atton I,evela Of fatte radiation levole identified by NRC nurvey tenine continue to be consistent with normal background leveln (0.02 mR/hr maximum). These reuults were obtained from routine surveys perfornwd downwind on the j east side of the Susquehanna River at dintancon up to five alles north and sour.h of the site, j l Dose rat.en (47 locationn) as measured by NRC thethno)uminescent donimaters (TLDs) for the past 24 hour period cen t.inue to b, consistent with normal background levels. NitC Pnvironmental Samplen (Samplen taken of feito vjjhin 3 miles of nite analyzed in mobile Inboratory) Ntunbcr of Samoin Tvoc Date of samole 194RitL Eenulta air 4/23-24 10

1. cam t.han MD A*

milk 4/21 4 Less than MDA daily aLr 4/22-23 1

1. ass than MDA EPA Environmental Samples (Analyzed at itemote I,aborgtory)

Ntsubor or Hampic Typa Date of Sample flample s

Renulto e I air 4/19 26 Less than hDA air 4/19 5

Range f rcan 2.1 to 6.9 x 1043 microcurinn per cubic centi puter (9.21 to 0.69 picoeuries pei l ethic meter) air 4/20 5 Range from 9 to 168 picoeur ias per cubic motor of Xn-133. 14 t.o 22 picocurt es por co'bic mater r.r-85.** These are approximately backgroun d levels. milk 4/18 6 1.ssa thnn MDA milk 4/19 9 Lesa than MDA ( ! All epa sampics were taken at distancon greater chart 2 milen from the sten, e i,

MDA = stinimum detectable ac tivity.

I

- Maximum Permissible Concentration for Xu-133 and 1(r-85 is 300.000 picoeuries per cubic matar.

i i The Comnenwealth of Pennsylvania han been informed of these results, t u t l

e .W IMMEDIATE PRELIMIMARY NCTTIFICATION I April 25h 1979 FRELIMINARY NOTIFICATION OF EVEKr OR UNUSUAL CCCURRENCE - PNO-79-67AF This pretinrinary notification constitutes sumastry information of an ev5st of safety or public interest significance. Thee_information presented lJ s a summa ry of information as of 7:00 a.m. on April 25, 1979. 'i Pacility: Three Mile Island Unit 2 Middletown, Pennsylvania (DN50-32@ Subiece: NUCLEAR INCIDENT AT TEREE MILE ISLAND Plant Status l In the course of transferring feedwater, flow t, the euxiliary nestlas 1 a cx. carryover of water into the steam line was exp'arianced, resulting in bra impingement in the main turbine. An' operator -Lnitiated turbine trip a. , about 3:00 p.m. stopped the impingemen t. The feedwater was being diverted t 'the auxiliary feedwater sparger in preparation for' aecondary system Inodt it htion for adding a closed cooling system. Steam is currently being admitted to hebec4 main condenser through the turbine bypass valv :irculation operations.% M ts. This change in coo g g mode will not affect preparations for natural l fhe average primary coolant temperature has increa sed to 224 degrees F. T' i highest incore thermocouple reading is 312 deg rees F. As a result of changing the charcoal filters 12 the A Trains of the I Attriliary and Fuel Handling Buildf'ng Ventilation Systems, the iodine 4 discharges have been reduced by approximately 30 percent. The chescoa ' Ad filters of Auxiliary Bbilding Ventilation Syst em Train B have been rep" Leed. This system was placed in service at 5:30 a.m. April 25. 1 Following a briefing of the Governor'n Office, a presa briefing van he. :t to outline the anticipated schedule for achieving long term cooling stmee \\44 A copy of the press release is attached. Environmental Status Three Aerial Measuring System (AMS) Surveys were made on 24 April 197% No radioactivity above natural background was detected. Iodine concentration at Unit 2 ventilation sta:k (Analyzed by NRC Hobi e Laboratory), l.. Date/ Time Activity (uct/cc) 4/24'(0408) - 4/24 (0637) 3.0 x 10" j 4/24 (0642) - 4/24 (0813) 4.2 x 10-8 4/24 (0815) - 4/24 (1215) 3.1 x 10-8 i; 4/24 (1217) - 4/24 (1600) 1.6 x 10-8 4/24 (1602) - 4/24 (1955)

2. 4 x 10-8 4/24 (1958) - 4/25 (0001) 2.6 x 10-8

g l Offsite Measurements Radiation Levels Offsite radiscion levels identified by NRC turvey teams continue to fe consistent with natural background levela (0.02 mR/hr maximum). nn -rw results were obtained from routine daily suiveys performed downwind a e~ the east side of the Susquehanna River at dJ stances up to five miles [ north and south of the site. Dose races (47 locations) as measured by NRC thermolumineacent dos -ters (T:.Ds) for the pas e 24 hour period continue to be consistent with n ural background levels. NRC Environmenral Samples (Samoles taken off site within 3 miles _ _of tpC analyzed in mobile laboratory) Numba e of _Samole *:5 roe Data of Mempl e_ _ Sam-ler Results l ! air 4/26-25 6 milk 4/23 3 Less than ' i mo4* Le e s than

mo" daily air 4/23-24 1

Less than W "M Remeen Laboratory) EPA Environmental Samoles (Analyzed at Number of Samole Type rate _of Sample Samples _ Results air 4/23 28 Less than MDA ' 9,j air 4/23 3 Range from 2.3 to M x 10"13 microcuries per owAc4 centimatar (0.23 0.71 picoeuries per eu h mater) atx 4/20 2 one sample was les than MDA. One sample licated 168 piccacuries

ubic meter of Xe-133.

Both samples indi ted antwrnr4 ma t e hmelagr%d lavels of Kr-85. ] ' All EPA samples were taken at distances gres ter than 2 ailes from th. .. site.

MDA = minimum detectable activity.

i

- Mav4= = Per nissible Concentration ferr X=-1 33 is 300,000 picoeuries.j'p er cubic meter.

The Conanonwealth of Pennsylvania has been informed of chese results. l L e t Attachmen t: Press Release Dated 4/24/79 i i I l l .' i l l k I. /

~ "t l s k:tachroent to 150-79-67A7 ..p "~ FOR IKMEDIATE REl. EASE April,24, 1979 i ; i The NRC f.taf f today announced a timetable for placing the Three Mile Island Unit 2 reactor on natural circulation cooling. Asstathdonpreviousoccasfom t, '"5"'*/ it is nou possible to cool the reactor by natural convection circulation if difficulties arise with presently operating equipment. It is, of course, preferable to, place the plant on' natural circulation iq a planned f ashion whiLi presently available plant instruments and equipment eersmin functioning. Rowever, if instrumenr.ation in the plant does not retain its reliability and tha various backup rnethods presently available do not fbnction adequately, it msy be necessary to place the plant on noeural circulat ion at-that time. The excessive non-condensable gases in the system have 3een removed and are noli .-rw-at so acceptable level. I Tha, phar.ed reduction in primary system temperature has mow reached approximate.. y 175 r. This reductico in temperature is greater than originally anticipated with steaming in the steam generator A. Assuming current instrume.ntation continues to perform a atisfactorily, the following timetable for a planned transition to natural circulation has been e stablished. Tbc sequences planned to reach this objective are: 1, The "B" secam generat or will be placed in a water s nid condition by April 29th. 2. The "A" steam generator vill be placed in a water w slid conditiosl by April 30th. 3. Action needed to upgrade the backup cooling capability of the existing decay heat removal system will be completed by May 1. 4. "Jith these steps completed, the primary system recirculatico pomp will be shut off on May 2nd and the system vill then go Lnto natural circulatici Tbsre are a number of other ongoing actions. at the plan t. 1. Radioactive effluent filter systems within the plant have been upgraded. An independent redunda'nt charcoal Iilter system, wh Lch will r.erve as a second stage pf removal, has been under construction for some time. The new system is expected to be operational by May 2nd ; I ) i

4 L... - s-.. m. N /

~

l 2-i l 2. Modifications are currently in progress that will perinit the seccedary side of the "3" steam generator to be operated in :s

losed system, i.e.,

without the need for the availability of the main cond etis er. This i activity is scheduled for completion for May 7th. Closed system cooling of steam generater B is not essential to establish s t:able natural circulation coolinF,. l Ah 3. The "A" steam gemat ator also will be modified t.v p.t n u. dr + 1h lu a closed system. This modification also is not requirhd to < establish natural. circulacion. Its schedule for completion is currently estimated to be the middle of May. 4. A passive level and pressure control systeni that wil.l augment existing plant systems is expected to be completed by mid-May This system is. not needed to achiave natural circulation, but it is prudent to add, thir, redundancy to the existing plant equipment for long term tnonitoring cf natural circulation coolin:.. l I S. Madificat. ions on the ensit e 'elactrical system are currently being made. Additional diesel genera:t. ors have been delivered to the site to provide a backup power supply, and are currently being placep on their foundations. Electrical instrumentation and other necessary connections will be cespleted by April 27th. 6. There are a number of additional modifications being tr.ade within the facility that are related to 'the long tarin recovery from the acci ent. Such snodifications include: adding an additional debay heat reto al system with equipment to process and remove the radihactive materials from the primary coolant system; the installation of additional tanks to provide for storage of contaminated water that may result t' rom decontamination activities; installation of additional contaminated water processing equipment, and general decontaminacken activities needed in the auxiliary bu11 ding. f m 6 l l e ~- a

a f j' '1 1 I IMMEDIATE C PRELIHENARY NOTIFICATION i. i May 1, 1979 (l PRELf[INARY NOTIFICATION OF EVLNT OR UNUSUAL OCCURRENCE -- FNO-79-67AL 'Thish ireliminary notification

onstitutes su:n: nary information of an event of sGety or public interest s Lgnificance.

The information presented is a

s une.4 y of information as of 7:00 a.m. on May 1, 1979.

M ,Lv: Three Mile Island Unit 2 Middletown, Pennsy1 rania (DN 50-320) I 1 Subg t: NUCLEAR INCIDENT AT THREE MILE ISLAND 71and LStatus h 'The y e::ge coolant temperatur e is being maintained at 175 degrecs F by

natuhl circulation.

Steam is being admitted to the main condenser through the prbine bypass valves from the A Steam Generator. The highest incore

tzmpt ature reading is 326 deg reos F.

E 'Envidnmental Status 'One rial Measuring System (AlG) Survey was made on April 30, 1979. No TediMetivity above natural ba tkground was detected. . / : 09 2 Iodi lp,oncentration at Unit 2.ventilgtion stack for the 24 hour period ending et 1( 08 a.m., April 30 was 1.5 x 10~ microcuries per cubic centimeter ,(Anaf zed by NRC Mobile Labora ;ory). k hffs de Measurements p Eadi ion Levels I Cffs ie radiation levels ident ;fied by NRC survey tcs:ns continue to be I ent with natural background levels (0.02 mR/hr maximum). These t cons x' asu ls were obtained from rou :ine daily surveys performed downwind on 'the et and vest sides of the Susquehanna River at distances up to five raitei, north and south of the s Lte. Does slates (47 locations) as maasured by NRC thermoluminescent dosimeters (TLDQ for the past 24 hour perL.od continue to be consistent with natural Ibakefound levels, d 1 bl 1, I il .I 6E l i g c w

O '.1 l 1 l C L 'nued May 1, 1979 Pa ] 2 PNO-79-67 AL li M:nvire tmental Samoles (S e les taken offsite within 3 miles of site ansTrzed in mobile laburatory) Jl Number of Le Tvve Date c f Sample. Samples Results S d l Gik 4/20 4 Less than MDA* dai r air 4/29-30 1 Less than MDA w+ oew

milk 4/: 8 1

Less than MDA , di large water 4/:0 1 Less than MDA ' ve

ation 4/: 0 3

Less than MDA Ag ,'s milk 4/3 1 3.19 x 10-8 pC1/ml EP

nvirertmental Samples (!snalyzed at Rem 6te Laboratory)

Saa e Type Date Collected Number Results i 11 Air Lodine 4/23 25 Two samples had detectable I-131 4/24 7 (Highest at 1.0 picocuries per cubic meter) - (Less than MDA i on all others) + I M11[ 4/23,I4,25 18 Less than MDA for I-131 Nobl e gases 4/26,27,28 6 Xe~133 levels from 10 to 958 picoeuries per cubic meter. (The highest was collected on 4/26-4/28 5.3 mi G 1450 Kr-85 g J was within the range of normal Kr-85. background.) E Mat b 4/22-4 /27 8 Less than MDA. l Air yodines 4/28 31 Less than MDA. II 4/29 4 2 were less than MDA, two showed I-131 at 0.38 and 0.48 picocuries per cubic meter. No l ;her agency data received The :ocnonwealth of Pennsyls ania has been inform'ed of these results. - cinimum detectable act tvity. Co. ection R FNOhr9-67AK, 4/30/79, reported M discharge water samples collected on 4/29/79. It $1ouldhaveread4_. I

rL g

PowM r Neff - R 7u H f% li l t

9 0 ...O**

.e.m+

Jr \\ i u. me N ~F s r,A _fkM .. = L L M /W f= ~ ayss a s_: 3 a 1. .. L_,_/__'r -.--, As e . ~ y &%.Y .-s j J ='=,- W +, i I 1 j w wem a ht- .g+, .6+ N 6mhew -e.. m 6.-eem.-me 66hh . =. :. -= 166 6WM

- 9M' m.s e6 O

N hh-W

0 i I g i D J^ ' ' i i IMMEDIATE PPZLIMINARY NOTIFICATION nl May 3, 1979 i l 8 h i >'.ELIMINARY NOTIFICATION CF EVENT OR UNUSUAL OCCURRENCE -- FNO-79-67AM is preliminarv notification constitutes summary information of an event T safetv or public interret significance. The information is being provided I );.(% describe the status of several system modifications related to both near $rm and long term recovery operations. Near term efforts involve reducing 1 idioactivity in the effit:ents from the plant, and establishing additional dundancy for long term dontrol and monitoring of the reactor systems. ll m f Mneer term ef forts invo16 decontamination of the auxiliary and containment / fildings, the reactor coc tant, and the processing of the associated fluids go lL.% e the activities. Addf tional FN's may be issued as significant milestenes j) a4 4e reached, in addition t o the scheduled once per week issues. cility: Three Mlle Isirpd Unit 2 p Middletown, Perneylvania (DN 50-320) f i Nabject: NUCLEAR INCIDDT AT "JLREE MILE ISLAND k.atus of Recovery Modific a ntion Program i y i lA I { ' Upgrading of radioactJve effluent filter systems within the plant is continuing. Two of four trains of an independent redundant charcoal ,2 filter system, which s erves as a second stage of removal have been ) D,E / placed in operation. The remaining two trains are expected to be operational tomorrow. ) Evaluation of initial effluent samples from the new filter trains y indicate the filters reduce iodine concentrations in the air passing I{ through the filters by a factor of about 10,000. Since about 207. I of the total flow doer not go through the new filters, overall l reduction of iodine in effluents to the environment is about a factor l of 5. Completion of 1he two additional filter units will permit all flow to be directed tliough the new filters reducing the iodine levels even further. !f. Modificatibs are coni;inuing to permit the secondary side of the "B" jl j steam generator to be operated in a closed system, i.e., without the ) need for the availability of the main condenser. This activity is l.. scheduled for complet:on about May 9th. (\\ It inay not be ne/to complete the modification to the " " ] \\ 1 cessaar ?.i steam generator / permit operation in a closed system. Modification i lvillcontinuepending a decision on this matter. i y The passive level and pressure control system to augment existing l l plant systems is unde: construction and is expected to be completed i by mid-May. This sys wm will provide redundancy to the existing i plant equipment.for lortg term monitortug of natural circulation cooling. i \\ I i ap I i I ~ t

3 a .e i y ~ ll l L ntinued PNO-79-67AM i ge 2 May 3, 1979 l j Modifications of the oasite electrical system are currently being made. l Two additional diesel generators have been delivered to the site to [f provide a backup power supply. Electrical instrumentation and other l( necessary connections-will be completed about May 8th. Il fl A number of additional modifications related to the long term recovery I from the accident are Ln progress. Such modifications include: adding an additional decay he'at removal system with equipment to process and remove the radioactive materials from the primary coolant system; the .q installation of additi mal tanks to provide for storage of contaminated water that may result from decontamination activities; installation of h additional contaminate d water processing equipment, and general decon-l tamination activities 2eeded in the auxiliary building. kLesent Plant Status: b de average coolant temperneure is being maintained at 170 degrees F by tf tural circulation. Steam is being adctitted to the main condenser through fe turbine bypass valve from the A Steam Generator. The highest incore [cperature reading is 322 degrees F. jivironmental l , C., tvironmental radiation le vels continue to be at background. A minor' release jcurredatapproximately 5 p.m. on 5/1/79. An aerial survey r.nd ground M sample taken during the release indicated 1-131 at MDA levels. Vegetation pies the next day were Melow MDA for I-131. 1,1 l t i 1 v i l I I I i l

lf DRAFT 5/7/79 f,I 6 M IMMEDIATE \\ PRELIMINARY NCTrIFICATION May 7, 1979 PRELIMINARY NCTIIFICATION OF AN EVENT OR UNUSUAL OCCURRENCE - FNO-79-67AM This preliminary notification provides updated information of safety or public interest significance. Facility: Three Mile Island Unit 2 Middletown, Pennsylvania

Subject:

NUCLEAR INCIDENT AT THREE MILE ISLAND operational status: 1. Three of.four trains of an indepenlent, additional charcoal filter system are presently in operation. Iodire concentrations in the gaseous effluest are consistently below continuous release limits /and below normallydetect-able levels most of the time. 2. Hydrostatic testing of the existing decr7 hent removal system ("B" loop) is in progress. The pressurizer has been taken " solid"(capabM to demonstrate continued ~ 3. decay heat removal G n the primary coolant system completely filled and to obtain confirmatory information on pressurizer level. 4. Measurement of the liquid level inside containment is planned the near future by measuring the hydrostatic head on the sump discharge piping using a recently installed Heise gage. 5. A measurement was made of the radioactivity inside the containment building. It indicates that the present dose level from gases within the building is about 100 R/hr. Other radiation sources such as activity deposited on the containment walls and water on the reactor building floor also contribute to the dose levels in the containment but cannot be directly estimated at this time. Environmental Status: Environmental radiation levels continue to be consistent with natural background levels. Approximately thirteen minor releases have occurred during the past week (May 1-6) in conjunction with venting of the primary make-up tank. Aerial and ground surveys taken during these releases indicated radiation levels at back-ground, except for the periods 2000-2100 hrs on 5/1, 1500-2000 hrs on 5/3, and 0700-0800 hra on 5/4, when aerial measurements reported I-131 at MDA levels and ground survey readings were 0.034 to 0.04 er/hr. During the period May 1-6, approximately 37 air samples were collected and all were # DA. Vegetation M samples collected following the releases were al1%MDA. EPA air and water samples collected during the period April 26 to May 3 showed no evidence of fission pro-ducts (0.1-M /I 1-131 for air, and 130 @ Ill31 fbr water). 3 (Cd - cees-v. c.A., g [g-R wcw p.J4, l - ' - ~ ~-

<H4 /V$k - CN rxt.t.intI E E05fFICATION May 14, 1979 PRELIr.hmt nu1 Ar AuuM 6F AN WENT OR UNUSUAL OCCURENCE - PNO-79-67AN This oreliminny noH fication erovides updated information of safety or public interest significance. Facility: Three Mile Island Unit 2 Middletown, Pennsylvania (DN 50-320) S_itb j ec t : N DC1.E AR INCIDENT AT THREE MILE ISLAND _ Operational: 1. The average coolant tempe rature is being maintained at 170 degrees F by natural circulation. Pressure is about 650 psi. Steam is being admit-ted to the main condenser through the turbine bypass valves from the A Steam Generator. The highest incere temperature reading is 308 degreen F. 2. All four trains of the independent, additional charcoal filter system are presently operable. Normally three trains are operating at any one time to provide additional filtration for the entire gaseous efflu-ent flow from Unit 2. Iodine concentrations in the gaseous, effluent have been below centinu^"r ily release limits and below detectabis levels most of the time. A A4 3. Preliminary hydrostatic testing of the existing decay heat removal system ("A" and "B" loops) has been performed. Leaks have been identified and are being corrected. 4. The prescuriser hac hnnn r1!rnn " solid" pnriodically to obtain confirma-tory information on pressuri:ar level and to check primary system leak rate. 5. Measurement of the liquid level inside coneninment is planned in the near future by measuring the hydrostatic head on the sump discharge piping using a recently installed Heise gage. Environmental Status Environmental radiation levels continue to be consistent with natural back-ground levels. There were approximately four minor releases during the past vaah;(May 7-13, 1979) aooos tated with vent.lus of the priusary inwkwup Lank. mud work on the new filter train system and monitors. During this period 14(24-hour cent.inuous air sampics and if air grab (I rn A hr) a nples were collected, and all woro lese chan IC A. A goat milk anaaple taken een May $ 1979 contained an I-131 concentration of 12 pCi/ liter. The latest goat milk sample collected and analyzed on H43 showed less than MDA for I-131 ( < 10 pci/1). Crass samples taken at the goat f arm showed I-131 levels less than MDA. Cow milk samples and grass samples from other locations show less than MDA levels for I-131. Ground surveys' aankinuad to show radiation to be at background levels. Aerill surveillance flights have not shown any levels nf J-)3) shn tre MDA. OPhar/Fodoral Agencico have not reported any positivs values for samples taken during this period. / IMMEDIATC ITC1.IMINAPJi UOTIFICATION \\ /3 8

a ..e. n v' Continued' May 14, 1979 PNO-79-67AN Paen 2

Contact:

RCPaulus, IE x27246; DThompson, IE, x28487 ,Di s tribut io_n : Transmitted H St Chairman Hendric Comissioner Bradford S. J. Chilk, SECY Cousnissioner Kennedy Commissioner Ahearne C. C. Kamerer, CA Comissioner Gilinsky (For Distribution) Transmitted: MNBB _ P. Bldg. J. G. Davis, IE L. V. Cossick, EDO H. R. Denton, NRR Region I H. L. Ornstein, EDO R. C. DeYoung, NRR Region II J..T. Fouchard, PA R. J. Mattson, NRR Region III N. M. Haller, MPA V. Stello, NRR Region IV R. G. Ryan, OSP R. S. Boyd, NRR Region V H. K. Shapar. ELD SS Bldg. (MAIL) W.J. DircKs, NMSS J. J. cummings, OIA S. Levine, RES R. Minogue, SD in (Tuz ) et>. (.Prnv4de ennv rn ATATE) White House Situation Room w e,n a r y... t.4. .,.4, en i t. ad.ulasle s.a o ws ...J Lt.. as.whiona centoe) EPA DOE /EOC PEYA BRP (State of PA) DCPA HEW Handcarry (FAA) IMMEDIATE i PRELIMINARY NOTIFICATION 9 e W e..em e sus ess

k. ~ IMMEDIATE ,. s ; 1 PRELIMINARY NOTIFICATION PRELIMINARY NOTIFICATION OF AN EVENT OR UNU3UAL OCCURRENCE - alO-79-67AO This preliminary notification provides updated information of safety or_ public interest significance. Facility: Three Mile Island Unit 2 Middletown, Pennsylvania (DN 50-320) Sub3ect: NUCLEAR INCIDENT AT THREE MILE ISLAND ~ operational: 1. The average coolant temperature is being maintained at 170 degrees F by natural circulation. Pressure is about 300 psi. Steam is being admitted to the main condenser through the turbine bypass valves frcm the A Steam Generator. The highest incore temperature reading is 301 degrees F. 2. Hydrostatic testing of the existing decay heat removal system "B" loop has been perf ormed satisf actorily. Leaks have been identified and are being corrected in the "A" loop. 3. The pressurizer has been taken " solid" periodically to obtain confirmatory information on pressurizer level and to check primary system leak rate. 4. The water level in the reactor building was measured and found to be 6.1' above floor level. This is about 450,000 gallons. 5. One of two primary system pressure indications now in use is giving erratic readings. Direct readi.ng pressure gages can be connected to r the system if nasded. Environmental Status Environmental radiation levels continue to be consistent with natural background levels. Approximately six minor releases have occurred during the past week (May 14-20) in conjunction with changing levels in the primary make-up tank and sampling the primary system. Aerial and ground surveys taken during these releases indicated no radiation level above background, except for a release at 1300 on 5/16, when an aerial measurement above the stack read 0.05 mR/hr. No radiation was dotected on the ground. During the period May 14-20, approximately 36 air samples were collected and all j were less than MDA. Vegetation and milk samples collected during this period also showed no activity above MDA. EPA and FDA air, water, milk and food samples collected during this past week up to 5/19 showed no de',ectable i activity from TMI. l t \\

4 Continued. May 21, 1979 Fage 2 PHO-79-67AO Contacts RC Paulus, IE x27246; DThompson, IE, x28487 Distribution: Transmitted H St Chairman Hendrie Commissioner Bradford S. J. Chilk, SECY Consnissioner Kennedy ' Commissioner Ahearne C. C. Kammerer, CA Conmissioner Gilinsky (For Distribution) Transmitted : HNBB P. Bldg. J. G. Davis, IE L. V. Gossick, EDO H. R. Denton, NRR Region I H. L. Ornstein, EDO R. C. DeYoung, NRR Region II J. J. Fouchard, PA R. J. Mattoon, NRR Region III N. M. Haller, MPA V. Stallo, NRR Region IV R. G. Ryan, OSP R. S. Boyd, NRR Region V H. K. Shapar, ELD SS Bldg. (MAIL) W. J. Dircks, NMSS J. J. Cunmaings, OIA S. Levine, RES R. Minogue SD IE (TMI) Site (Provide copy to STATE) White House Situation Room FDAA (Provide copies to the Administrator and the Operations Center EPA DOE /EOC PEMA BRP (State of PA) DCPA HEW Handcarry (FAA) IMMEDIATE PRELIMINARY NOTIFICATION - =, -

r 4 May 21, 1979 IMMEDIATE o PRELIMINARY NOTIFICATION / PRELIMINARY NOTIFICATION OF AN EVENT OR UNUSUAL OCCURREN - FNO-79-67AP iminaMotifica$on providdad2ed inf6Psation of safetv or ~ s $ubid c.- ific er% s t digniTicane e. V W t/ L/ V Fseility: Three Mile Island Unit 2 Middletown, Pennsylvania (DN 50-320)

Subject:

NUCLEAR IN IDENT AT THREE MILE ISLAND - DEATHS y REPORTED C J DN/bdi'a#41\\r Newspaper, television and rad;o stories this past weekend have reported that a number of cows have died in a herd near TMI at the Hoover Farm in Bainbridge, Pennsylvania. The article in the tiarrisburg Sunday Patriot News reported that the owner of the herd believed ftfp the deaths were caused by the accident at TMI. The deaths all involved cows giving birth. Twelve calves have been still-born and 7 cows hsve died af ter giving birth. The article stated that the state lab and the itershey Medical Center have conducted post mortems and other tests on the dead animals. The symptons conunon to all the deaths were in-trauterine infections and anemia. On Sunday afternoon, May 20, 1979, an NRC survey team accompanied by an EPA representative huAM went to the Hoover Farm located about six miles south-east of the plant. Mr. Hoover and his wife stated that they suspect the cows died from leukemia caused by the radiation from TMI. They stated that they never had this problem in the past. They also stated that they knew of two other farmers that were having similar problems. The initial death occurred on April 5. The survey team took samples of feed, grast, soil, well water and milk for radiological analysis. The EPA representative also collected samples. The Pennsylvania State Department of Agriculture has veterinarians looking into the problem. They are investigating the possibility that a virus infection-is the cause of the deaths and that, if so, in a few days they will have identified the virus. The State Bureau of Radiological Health will make a radiological examination of the internal organs of one cow. Another State Agency will ex-amine them for heavy metals. The FDA has sent a veterinarian from the Phila-delphia regional office to examine the herds involved.

s Continued May 21, 1979 Page 2 PNO-79-67AP x.-D.9 6 9 7 A2 9t &T e g,p "3e m,.C_ L.3 b = m y % L8 M

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A T:ul s tr 1979u;--;Ti. y.r, Is7 229':37 Distribution: Transmitted H St Chairman Hendrie Commissioner Kennedy Concissioner Bradford S. J. Chilk, EECY ~ Conmissioner Gilinsky Commissioner Ahearne C. C. Ka::nnerer CA Transmitted: FNBB (For Distribution) L. V. Gossick, EDO P, Bldg. J. G. Davis, IE H. L. Ornstein, EDO H. T., Denton, NRR Region I J. J. Fouchard, PA R. C. BeYo ung, NRR Region II N. M.11 aller, MPA P. J. Mattson, NRR Region III R. G. Ryan, OSP . Stello, NRR Region TV H. A. Shapar, ELD

a. S.

Boyd, NRR Region V SS Bldg. (MAIL) W. J. Dircks, NMSS J. J. Cuciming s, OIA S. Levine, RES R. Minogue, SD 4 IE (TMI) Site (Provide copy to STATE) White House Situation Room FDAA (Provide copies to the Administrator and the Operations Center EPA DOE /EOC PEMA BRP (State of PA) DCPA REW Handcarry (FAA) IMMEDIATE FRELIMINARY NOTIFICATION l l i

~ N May 29, 1979 IMMEDIATE PRELIMINARY t!OTIFICATION PRELIMINARY NOTIFICATION OF AN EVENT OR UNUSUAL OCCURRENCE - IWO-79-67AQ This pt eliminary notification provides updated information of safety or public interest significance. Facility: Utree Mile Island Unit 2 Middletown, Pennsylvania (DN 50-320) Subiect: NUCLEAR INCIDENT AT THREE MILE ISLAND Operation al: 1. The average coolant temperature is 158 degreen F and being maintained around that temperature by natural circulation. Pressure is about 450 pai with the pressurizer in solid operation. Steam is being admitted to the main condenser through the turbine bypass valve from the A Steam Generator. The highest incore temperature reading is 291 F. 2. Water level in the reactor building is oeing measured daily, and was 6.8 feet above floor level th!.s morning. The lowest decay heat system motor-operated valve (DH-V2) in the reactor building was opened on May 25 as a precautionary measure, due to increasing water level. Secondary sources of water into the reactor building have since been isolated, including the fan coolers water supply, ,to reduce water in-leakage. 3. Preoperationni testing is in progress for the Spent Fuel Pool Tank Farm, ,,,0?ee "B" Long-Term Cooling Sys tem, and LW Ccq (Ot.p-GW I D Sy.ee.. The / testing is scheduled for completion by June 1. N% '7%4M -%n d, g gpg.,g g,Q tuvironmental Status ,4 ggg Environmental radiation levels continue to be consistent with natural background 1evels. A slight change.in background level on May 24 and 25 was shown to be due to changing levels of naturally occurring Rn-222 caused by a weather front moving through the area. Airborne releases have been below Technical Specificatinn limits. During the period May 21-28, approximately 35 air samples were collected by the NRC and all were less than MDA. Vegetation and milk samples collected during this period also showed no activity above MDA. EPA air, water, and milk' samples collected during this past week up to May 24 showed no deceetable actf.vity from TMI. The State of New Jersey reported that they detected no I-131 in any of the 83 milk samples they analyzed between March 29', 1979 and April 24, 1979. These samples included milk from counties within 50 miles of Harrisburg, Pennsylvania and supplied to New Jersey consumers, the Salem, New Jersey area, and northern New Jersey farms. . ~. ' ~ ' m'

} ) l l Continued May 29, 1979 Page 2 PNO-79-67AQ ? A *, /9 99 Analyses have been completed on samples of milk, water, soil, feed and grass collected at the Claire Hoover farm l= ; L., (Reference IHO-79-67AP). No reactor related radionuclides were detected by either the EPA or NRC.

Contact:

RC Paulus, IE x27246; D Thompson, IE x28487 Distribution: Transmitted 11 St Chairman Hendrie Commissioner 3radford Comissioner Kennedy Commissioner Ahearne Comissioner Gilinsky Transmitted: HNBB P. Bldg. L. V. Gossick, EDO H. R. Denton, NRR H. L. Ornstein, EDO R. C. DeYoung, NRR J.'J. Fouchard, PA R. J. Mattson, NRR N. M. Eclier, MPA V. Stello, NRR q R. G. Ryan, OSP R. S. Boyd, NRR H. K. Shspar, ELD SS Bldg. W. J. Direka, NMSS S. Levine, RES IE (TMI) Site (Provide copy to STATE) White House Situation Room FDAA (Providc copics to'the Administrator and the Operations Center) EPA DE/EOC PEMA BRP (State of PA) DCPA HEW Handcarry (FAA) IMMEDIATE PRELDf1 NARY NOTIFICATION e 3 I b e r y -r r .....#-.--,4

h ~l IMtdEDIATE PRELIMINARY NOTIFICATION June 4, 1979 FRELIMINARY NOTIFICATION OF AN EVENT OR UNUSUAL OCCURRENCE --FNO-79-67AR This preliminary notification provides updated information of safety or nublic interest significance. Facility: Three Mile Island Unit 2 Middletown, Pennsylvania (DN 50-320) Subieer: NUCLEAR INCIDENT AT THREE MILE ISLAND Operational: 1. The average coolant temperature is 157 degrees y and being maintained dround that temperature by natural circulation. Pressure is about 340 psi with the prensurizer in solid operation. Steam is being admitted to the main con-dec:ar through' the turbine bypass valve from the A Steam Generator. The highnet. incore temperature reading is 286'F. 2. Water level in the reactor building is being measured daily, and was 7.0 feet above floor level this morning. 3. Preoperational testing remains in progress for the Spent Fuel pool Tank Farm, once-Through Steam Generator "B" Long-Tem Cooling System, and the modified rad waste treatment system (EFICOR). The testing is scheduled for completion by June 8. The pressure / volume control system is due to be turned over for preoperational testing in a few days. 4. An individual posing as an employee of' a legitimate contractor at TMI-2 attempted to. gain access to the site at 10:45 p.m. on June 2, 1979. The person did not have a site photo identification badge and was refused access l t

1 l Continued 2 June 4, 1979 PNO-79-67AR by the security guard at the south gate. The individual left the site access area while the guard was attempting to verify his identity. N The guard obtained the imposter's vehicle license number (California plate). tentatively The individual has beenAldentified by the Pennsylvania State Police. No I further action is planned by the licensee. Additional followup of this matter will be conducted by the Region I office. estfo'no'veYiTeht. ae TMI.durinfthe yniNeekanL ' Hit ,PNO-79-67T reported: "The hydrogen recombiner tripped off at 0115 on April 13 (burned out heaters)... A decision had not been made whether to replace the heaters or to initiate operation of the backup recombiner." It was later determined that the recombiner trip was caused by a shorted quick-disconnect plug. The f ailure was corrected and the recombiner was returned to operation on April 15. Environmental Status Environmental radiation levels continue to be consistent with natural baclground levels;.' Airborne releases have been below Technical Specification limits. During the period May 29 - June 4, approximately 37 air samples were collected - by the NRC and all were less than MDA. Vegetation, soil, and milk samples .. w :.- ^ 7-collected duri.ng..t.his' period filso..showed no activity above MDA. EPA air, water Q s, m 3.;: z -..;. _ and milk.samplesicio11ected'during. this p ast week up to Juno 1 showed no ' detectable act'ivity from TMIQ ' A, "~? ....;. ;._ :5 ~ - b,'*; ,e ..17.,--1.,' 1 6:

"_. a. - '

i

9 June 4, 1979 Continued Page 3 /......... -.... .. FNO-79-67AR 1 ..~ .~.r.--.-.-..... l' ' ' ' .c. --. - P.CTa ul u s, IE r.27 2 4 DThe= ge.,,7E x20!S7 ~

,e., a c t c.e tributioc "runsrit' ed 3 3t Coner.ir.ri oner Iradf ord S.

7. Ch.i.1h, SECT '.i-~. rr e n~5e~dri e. .u - Coccis si crier Abca rr,e C C. Jar:nse r e r, r,mi s si oner Tre.:4r oy (For 'Distrnutz en) Co.==ir s 3 cuer Cilincl.y'......, " 9.CRS Tr e:: sci tte d: SEB .P' B1 d g J G. T>ad s, IE R.. R. Tsen t on, hRR Region I 1.. V. .~.or s i ch, IDO - - ^ I. I.. Or: stein,.IDO R. C. LeToung, NRR Eegion 13 J. fi. Fraucha rd, I'A R. J. ".attsoc. );'ER ECS oD 111 i y, g, .iz1l er,.OA V. S t '-ll o. b'E2 E *" 25 " 1Y R. G. T::ac, C5? R.

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~ cLp ss 3 d - # M..A.I.L.) .e.. 1 c, a, k~..J. Di r c h:, .t'".3 S. J.,,, Cu. cings, O,di S. 'I.edu e, ?.IS T.. M i*.:urue, SD {rre.u oe. r opy *.o r.:,,. A t4 :.J.,. II (TacI).. Site ~: e $ 8 C. A*cra~1d o.,,.PA ._ '. (M5 d,di ctc n, "JMI Jofor ::m - i or, Cen' er) ~ Vh.i t e Jinus e SI ua ti on Roem.m ::f._ y.. y1.AA (Trovide c opi es.to t he Ad='t,is t.ra tor a nd 'ce Opers ti e=s Ce:. e:) .... -c u- ..; ~ ;. :2, : -yis n -..p:-

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