ML17297B927
| ML17297B927 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/16/1979 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-79-067W, PNO-79-67W, NUDOCS 7904190011 | |
| Download: ML17297B927 (6) | |
Text
Q
'q,r e
Sent g),<lh C.
J
,I
}DDT~
- @W,aa
.tr
~J e'rr "I
3f,l r~)Ch ih'P;"
$4Vc! ~ ~
phh tlF
~
k-".'~;;.t, r "i V
~
h
~ ~
- ,thi-"
'd~"'":::
'r~~g0~h
~
- e P,
~
'h+/.. 1 rre.'I ~
W.ib>h.sl t~p r QrrQ IMMEDIATE PREL IMENARY I HOTIFI CATION 0.."
/fgj Q
gp I
g le rj7 r~h April'6, 1979 Plant Status:
The primary coolant temperature remains at -approximately 250 degrees F.
Four of the incore thermocouple readings remain above 300 degrees F
with the highest at 344 degrees F,
The hydrogen recombiner that failed on April 13 has been repaired and is in service.
At 0800 on April 15, 1979, the hydrogen concentration was reported to be 1.46Ã compared to the reading of 1.48~~ reported at 2200 hrs.
on April 12, 1979 bef'ore the recombiner failed.
Environmental Status:
Offsite radiation levels indentified by NRC survey teams were consistent with normal background levels (0.02 mR/hr. maximum).
The resu'!ts 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 4:00 p.m.
on April 15,
- 1979, 482 local residents had been scanned with the whole body counter located in Middletown.
Scan results indicated no radiation levels above normal body levels.
The fol'lowing'Aerial Measuring System survey was Mind speed var~able 5-20 mph..
Time Hex. Redietion L'evel 5ectoh' 0.013 mR/hr 120o 1700-1815 conducted on Ap) il 15 Distance from Site 1/4 mHe (elevation 300 ft)
CONTINUFD
'M"iED IAYE PRELIMINARY NOTIFICATION q 90az900 i X PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PHO-79-67M This reliminar notification constitutes sunnier inf'ormation of'n event' sa e
or u
ic interest si nificance..T e
nformation resente is a
suronar o
information as o
7:00 'a.m.
on A ri 16, 1979.
Facility:
Three Nile Island Unit Z Niddletown, Pennsylvania (Dhl 50-320)
Subject:
NUCLEAR IHCIDENT AT THREE MILE ESLAHD
~ ~
%~i
~P ~M I'
~orn ~
r1 L~tee e 221eni ee a
~.'r'.
e E
n>
J+yt'
+lm'2 4 l1
~
qr,y.
mme:
~
Qrg$45 e.
'i.r~'i 1n Ls F' \\
~
2~PJ'a~"tr.
~II+4$
+n
(
~~~75 '
Page 2
Continued April 16, 1979 PNO-79-67M Time 4/10 (1608) - 4/11 (1800) 4/11 1920) - 4/13 (2315) 4/14 (1030' 4/14 (1915) 4/14 (1915
- 4/15 (0525) 4/15 0525) - 4/15 (0804) 4/15 I0805) - 4/'1.5 (1802) 4/15.(1802) - 4/15 (2140)
Activit (uc/cc) 2.3 x 10-8
~
1.2 x 10"7 1,4 x 10-7 2.5 x 10-7 2.7 x 10"7 I
3e8 x 10"7 2.1 x 10-7 Environmental samples obtained during this period have shown some increase in radioactivity.
While the exact source of the. increased activity has not been deter'mined, it may be related to changeout of filters in the Auxiliary Bui'lding.and/or tripout of the Auxiliary Building ventilation fan.
Efforts'are in progress to correlate work activities with the increased Iodine concentrations.
On April 15 and 16,
- OOE, NRC, and the licensee measured Iodine levels in the switchyard; 0.6 miles east of the reactor site.
Airplane over-flight occurring at the same time indicated a very narrow plume.
Recent measurements (0200 4/16) indicated 9.4 x 10"11 uc/cc for NRC
- sample, 7,4 x 10"11 uc/cc for 'licensee sample and 6.0 x 10-11 uc/cc for the DOE sample.
The HPC for'iodine-131 in unrestricted areas is 1 x 10"10 uc/cc.
Al'l samples:were side by side samples.
The State of Pennsylvania has been informed of'hese results, In addition, the State Nil'I be provided with the DOE samples for analysis.
Contact:
- GCGoner, 15 x 27245; DThompeon, lE x 28487
~;1 CONTINUED IMMEDIATE PRELIMINARY NOTIFICATION The NRC took an air sample neat the observation center starting at 1200 on April 14 and ending at 1700 on April 15.
Analysis of this samp'le indicated that the concentration of iodine-131 during the 29 hour3.356481e-4 days <br />0.00806 hours <br />4.794974e-5 weeks <br />1.10345e-5 months <br /> period averaged
- 4. 1 x 10-12 uc/cc.
Dose rates (47 locations) as measured by NRC thermoluminescent dosimeters for the past 24-hour period of April 16 are near expected natural background 'levels.
Iodine cartridge measurements (from the Vnit 2 vent stack) indicate that increased iodine release rates begin occurring on or around April 12.
Iodine concentrations measured in the ventilation stack are:
Page 3
Continued AprH 16, 1979 PHO-79-67H ed~'I e:s
~~'an
'~9::
- teN,
~ ~
',':sa
'I.'PC' naaaett>>'t e
Q+qAjjes ii Iwpgg<j, na ceo
~
e
~V~<<e r~Pj,
'4a'e ra erraitst
'g~,
'=,-,~l~'te:
e Distribution:
Transmitted e i Corwissioner Kennedy Coomissioner Gilinsky Transmitted-HHBB ~4, L..V.'Gossick, EDO H. L.'r nstein, EDO Je J. Fouchard, PA H; Hailer, MPA R. 6. Ryan, GSP H. K. Shapar, ELD H St Co~iss>oner Bradford Comnissioner Ahearne P. Bldg /'M H.
R. Denton, llRR R.
C. DeYoung, HRR R. J
- Hattson, HRR V. Stello, HRR R. S. Boyd, HRR SS Bldg M. J.
Di c s, SS S. Levine, RES IE {YMI) Site
. l,'Provide copy to STATE)
Mhite House Situation'Room PDAA (Provide cop>en to the Administrator EPA DDE/EGG BRP (State oP PA)
DCPA HEM {PTGR~up Handcarry
{FAA)
IHHEDIATE, PRFL ]NINARY NOTIFICATION
~e e
S. J. Chilk, SECY C.
C. Kamnerer, CA
{For Distribution)
J.
B. Davis, IE Region Region II~
Region III Region IV Region V ~-Q
{~AuL J~ Cu(nnings, OIA R. Ninogue, SD and. the Operations Center).
~
- e a
eee
.a se e, ess e
se'-4
',z
(
0 I
Al t