ML19199A293
| ML19199A293 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay, Crane |
| Issue date: | 04/02/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| Shared Package | |
| ML16341B158 | List: |
| References | |
| NUDOCS 7904110029 | |
| Download: ML19199A293 (1) | |
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UNITED STATES j#" " W, NUCLEAR REGULATORY COMMISSION
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elEGION V
$UITE 202. W ALNUT CREEK PL AZ A
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1990 N. C ALIFORNI A DOULEVARD o
WALNOT C REEK. C AllFORNI A 94596 e
,,4 April 2, 1979 Docket tio. 50-133 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94106 Attention: Mr. Philip A. Crane, Jr.
Assistant General Cot.nsel Gentlemen:
In accordance with our letter dated April 1,1979 transmitting Bulletin 79-05, we are enclosing Preiiminary flotification 79-67H.
Sincerely, i
5 R. H. Engelken Director Enclosure Pil0 67H cc w/ enclosures:
W. Barr, PG&E W. Raymond, PG&E E. Weeks, PG&E, Humboldt Bay M
79041100 0310 la 078
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PRELIlilliARY 1:0TIFICATICH April 2, 1979 8
c3 PRELIMIllARY NOTIFICATION OF l'VEur OR UNUSUAL 0:CURRE.' ICE-Pl
' This preliminary notification constitutes su. c. cry _i,nfor.ution of an event
.c Tlhe inTormtion presented is a of safety or public intemjit_signfTicance.
su mary of infor-stion as of 12 noon on 4727/4 w
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~ Facility:
Three illie Island. Unit 2 lliddletown, Pennsylvania (Dil 50-320)
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Subject:
liUCLEAR IllCIDENf AT THREE MILE ISt>JiD
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Plant S btus Reactor pressure is being held at about' 1000 psi.
Incora tharnocouples N
' continue to show n decrease i_n fuel channal te~peratures, with all "j
naasuretants balow about 475 degrees F.
Bulk core inlet and outlet twperaturas are 280 degroos F.
At 11 p.n., April,1, a contain.eent air g..
vri sanple indicated 2.3% hydrogen.
4; rurther analyses and consultations with experts has led to the develop-ent of a strong concensus ibat the net oxygen genercition rato inside
'i the noncond2nsible bubble in the reactor is nuch less than originally conservat.ively estinated.
Also, r0asurements at the plant appear to ladicate that the volu;ae of gases within the bu' ie is being signifi-P cantly reduced.
Further developr.ents are being closely followed to' confira these favorabla indications.
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Action on Othar Facilities a
M Tha Threa flile Island Unit 2.(THI-2) pressurized water reactor was supplied by Babcock I. Wilcox (daw).
All utilities with an operating B&W
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. reactor vare sent an NRC Bulletin yesterday to provide them with inforpa-H tion about the T iI-2 incident; require a prompt review of their plant tiRC conditions, and to ef fect action to provent such an incident.
inspectors are being sent to each licensed DIM reactor to provida Additional reactor shutdowns or power
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increased irspection coverage'.
reductions are not being required by the NRC at this time.
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'.Q Envirormntal Status _
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Thirty-seven thernoluainescent dosinetry (Tlu) stations vece established by tha NRC at. distances from about one mile to about 12 niles fron the O
plant. Multiple dosireters are placed at each location - one vill be
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1 April 2, 1979 Ccntinutd PNO-79-67H 4
Pege 2 lef t in place for a cumulativ,e dose ceasurer.ent; another is pulled and i
replaced each day.
TLD's collected on April 1,1977 indicated the i
follcuing dose rates in populated areas:
Location Dose Rate (Hiliircentgens_ per Har-}
n1 Middletown 0.044 0.13 f:j Coldsboro
- 0. C40 Goldsboro
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0.053 d
Lewisberry Pleasant Grove 0.0 11 0.0/4 4
York Itaven i
Consago Falls 0.044 0.653 r
Eaicsville The highest dosicetar reading was recorded at a 1ccation h oile ENE of the plant. The average dose rate at this location was 1.1 nillircentgen per
= ~l hour.
For cc oarison purposes, the licensea's envirorJ antal report for 1977
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uhan ene unit ws cperating, indicated that the average dosa rate at of fsite stations located within three niles of the plent was 0.007 tR/hr.
Calculations using tha TLD data indicate a population dise of approxi-nately 200 can-reas for the 24-hour pericd.
This r.eans thare was an rcdiation dosa of about 0.3 nillirens ;.2r per:ca in the population avercg
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within a 20-aile radius of the plant.
AFd!'s flights vera centinued at three-hour intervals on April 1, and 2, 2
1979.
The plun readings were essent' ally the same for all the flights.
'f Direction of the plu e varied from S'J to b?N.
The mimum level at one
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nile frca tha plant was about 3 rR/hr at an altitt:ce of 500 feat. At
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three niles, the levels were frca 0.1 to 0.5 cR/hr.
Offsita ground level surveys taken hetween 11:C0 a.n. April 1, and 4:30 2
a.m. April 2, on both sides of the river in a sr>utherly direction
$. <,6 generally showed levels of 0.01 to 0.04 nR/hr.
Hine nilk saples collected and analyzed by the State of Pennsylvania on f
April 1 showed no detnctable radioiodine.
Tha licensee reported results from 5 nilk smples taken frcm fcur loca-tions around the plant collected the evening of !hrch 30, 1979.
The samples included one sarple of goat's_ milk and four se ples of cow's nilk. The
~~4 highest lovel was reported for the goat's milk and was 41 picccuries par liter (pCi/1.).
The highest level in co'.v's nilk was 8.4 pCi/1.
The f.'RC
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has estinated the thyroid dose to a child drinking nilk with concentra-tiens of radiciodine at 41 pCi/l to be about 0.2 aillirco per day. The Each or thyroid done to an adult wouhi be about 0,07 nilliren per day.
1' these sa ples indicated levels slightly above norr.al heckground levels 7
for radioicdino.
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CONTINUED 13 ne,0 m.
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Continued April 2,1979 Pt.'0 67H i.
Page 3 n
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The Bureau of Radio'legical !!ealth, HEW, also reported identifying radio-iodine in six sa. ples of nilk collected on Ibrch 31, 1979 froa four
' d locations around the plant.
Analyses of the saxples identified,near background levels of radiciodine.
The levels ranged fro a the ninimra H
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detectable limit to about 40 pCi/1.
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For cc,'parison, the licensee's environmental report for 1977 show d observations of 0.74 to 31 pN/l of I-131 in nilk throughout the year
'2' previous to the incident.
At 12,000 pCi/1, the U. S. Depart. tent of thalth, Education, and b'elfare roccm.; ends placing dairy hards on stored
'"i feed.
Local hards are.ilready on stored feed.
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Contact:
DTho.mpson, IE x28487 NCMoseley, IE x28150 W= =,
Yd Distribution:
Transmi tted 11 St 8.'9n.n,,
'CIiiiraan Hendrie Comiissi Elr Bradford S. J. Chilk, SECY Comissioner Kannedy Co missioner Ahearne C. C. Kr m rer, CA m:
Comissioner Gilinsky (For Distribution)
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P. Bldg (fja_.Tp,
J. G. Davis, }E J.i Tranoitted:
H. R. Denton, tiRR
%gion I 6,-; l l L. V. Gossick, EDO fX. g f H. L. Ornstein, EDO R. C. DeYoung, NRR hejion II c,u J. J. Fc.uchard, PA R. J. Mattson, NRR Region III ne-eI__'.T 9 T
N. H. lialler, MPA V. Stello,tiRR Region IV fb i7 V' R. G. Ryen, OSP R. S. Boyd,, NRR Region V
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H. K. Shapar, ELD 55 Bldg 3'* 9 3
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_ f4 W. J. Dircks, tiMSS J. J' Co,.aings, DI A R. Minogue, SD
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IMMEDIATE
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_ _ _ __. _ _ _ _ _ __ _ _ _ _ __._e_nt 1 _ ___ _,,
- 'p Attach NRC THER'40LUMIriESCENT D051 METER (TLD) DATA Jh.chers are cuir.ulative radiation dose in
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millirem over a 23 hou'r period during i
P. arch 31 and April 1,1979.
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The highest dose (25 a mrem) was measured I
at 0.5 miles EliE of the plant; the nex' f
i highest (10 2 mrem) at 1 mile SSF./
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