ML17272B043
| ML17272B043 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/08/1979 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| TASK-AS, TASK-BN-79-17 BN--79-17, PNO-79-067N, PNO-79-67N, NUDOCS 7904120085 | |
| Download: ML17272B043 (5) | |
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C DhiEOIATH PRELIHINARY NOl.IFICATIOH April 8, 1979 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE"-PNO-79-67N This reliminarv notification constitutes summary. information of an event of Safet Or u
C ntereSZ S <'njficance.,
The infprmat>pn reSente S a suenar o
intorwat on as of ?:00 a.m on 4 8 79, Pecilitv: Three Nile Ie lend Unit 2
,O'Iddletewn, Penneylvenie (ON 50-3EU)
'cub ect:
NUCLEAR INCIDENT AT THREE NILE IRLANU Plant 5tatus P
Bulk coolant in'let and outlet.t, mperatures are about 281 degrees F.
The average core thermocouple temperature is about 299 degrees F,
and the higher thermocouple reading (SH).is about. 442 degrees F.
At approX3mate3y 1955 hours0.0226 days <br />0.543 hours <br />0.00323 weeks <br />7.438775e-4 months <br />, April 7, the licensee began lower'lng reactor-coolant system pressure in ~0 psi increments at a maxitnum l'ate of 5 psi per riinute.
This will continue until preSSure reaCheS 500 pS), providing a M0 psi safety margin above saturation for the current temperature of the highest reading thermocouple.
This is a step toward cold shutdown and includes degasification to prevent bubble formation as pressure'nd temperatures decrease.
During the initial pressure decrease to 700 ps), the auxi'liary building stack monitors showed an increase. of a factor of 10 at 2213 hours0.0256 days <br />0.615 hours <br />0.00366 weeks <br />8.420465e-4 months <br />', April 7.
Later information indicates that about 3400 gallons of borated water were added to the makeup tank during the initial pr'essure reduction, causing some gas to leak from the vent header.
The ARHi helicopter reported a
slight inrrease in readings downwind (south) of the site.
Pressure was' held steady for' short period and the auxiliary stack monitors decreased to the original readings.
During the following pressure cycles there have ',-..
been no increases in the radiation readings
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Hydrogen concentration in containment is about, i.s".
At 2130 hours0.0247 days <br />0.592 hours <br />0.00352 weeks <br />8.10465e-4 months <br />
- PST, Ap)il 7, a$ l l$fting ot'ackup charcoal filters for the auxiliary building stack was initiated, tres Pasco, NA, to Harrisburg, PA The Unit, 2 miscellaneous waste tank
$ s.being pumped to a b'feed holdup tank in prepalation for pumping the aukil'iary building sump dry Ilff5 discharge'as stopped late on April 7 wherr the level reached 32M.
CONTINUED.
7 F04 y200 85
Continued Page 2
April 8, 1979'NO-79-N Environmental Status Offsite radiation levels identified by HRC survey teams continue to range between 0,01-0.1 iliA/hr.
These routine survey results were obtained on the east an(i west sides of the 5usquehanna River at distances of 4 iqiles north and south of the s'ite.
i'r ev'ailing winters dul ing April 7 were genera'lly from about, 320~,
.4Rii5 surveys were pH't'ormed on April 7 at 0600-QS30 hour's and l800-1845 hours.
The surveys ident'ified a
na> row plume in the 140 -lBD sector during both flights.
A maximum radiation 'level of 0. 04 riiR/hr at 1-10 miles was identified during the 0600-0630 hours flight.
The 1800-1845 hours-tlight identified a maximum reading of 0,05 mR/hr at 1 mi'le from the site.
The fOl laqihg mi'if'ample reaultS Were reported by. the licenSee,.
Locatloa LL silos east-northeast.
3/zs Todine Concentrat.ion icocuries/l.i er)*
3/30 3/3l
'/1 4/z 4/3 1.6 milks southeast 2.7 NilL~s west" northwest control lg miles north-northeast 21 "HEN Action Level.'2,000 picocuriQs/1 iter The fol lowing table lists the composite results fo> milk samples collected by various agenCieS betWeen 3/28/79 " 4/4/'19.
Descri ti'on Number of analyses pertor'mad Number of positive results Average value of positive results (pCi/1)
Range of positive results (pCi/'1)
Average tSA (pCi/1)
STATE FDA 133 84 7
53 3.5 19 D 20 9 sQ ZO ll 2D 10-24 10 The following iodine-131 concanLrations in air and water were identified by the licensee; r
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Continued Page 3
IIpril 8, 1979 PHQ"/9-H Location
~Ai S-Results.
icocu> ies er cubic meter
~"'/28-,
3/29 3/29-3/31 3/31-4/3.
0.4 mile north 2,3 miles sou5h>>souhheast 0 4 east.
ls u
northwest 9
southeast 2.6 north 1.6 west-southwest
>3
- 0. 47
< Q.p
< 0.02
< 0.03 0, Q4.
- 0. 08.
< 0.30
< 0.02
- 22. 6
- 22. 1 2O. 3
- 1. 83
~ 0. 27
- 12. 7
- 23. 9 0 14
- 0. 11
- 1. 39 0-27
< 0.024
- 0. 16.
- 0. 051 0.N
- 0. 36
"'10 CFR 20 WPC=
100 picncuries/cubic meter'.
~th I,
/
11
/ /
4/3///
Looat'Ion SvaMra Creek (2.3 miles.north)
Bvunner Island (4.1 miles south-southeast, Columbia water treatment plant (15 n)iles southeast)
Yol k }{aven (3 mlles southeas t.)
York (lB iniles southeast)
"~"'10 CFR 20 HPC:
100 picocur$ es/liter Resnitssss
< 0,2 pCi/1 Hew data regarding dose vates in populated areas have, riot been processed neatest'.
P Bldg H.
R
- Denton, BIRR R.
C
- DeYoung, HRR R. J
- Hattson, HRR V. Stello, NRR R
- 5. Boy, g5 55 Bldg M. J. Dirc s, MSS 5
- Levine, RES A
m(5 nistrinotien:
Tranemitted B Bt
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Chapman Hendrie gmomz ss sneer Bradford Cnmmissionev Henries Commissioner Ahearne Cqmmissinne>'ilfnskg Transmitted:
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L. V, Gassick, EDO H
L, Ornstei<>,
EDO J. J,
- Fnuchavd, PA H. H. Hallev,,
l)PA R.
G.
- Ryan, OSP H.
K. Shypav, ELO S. J. Chalk, SAUCY C.
C.
Kammer er; CA (For Distribution}
J.
Region II
.dd" Region III ".dZ Region IV 9.'z~
Region 'ij'~~a/'
{NIL)
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- Cummings, Ojh A. Ninogue SD COHTlHUED
Continued Page 4
Tt (THT) Site 4:> -
(Provide copy to STATE)
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Efv FOA/BRH ODE/EOC EDDA/FERA BRP (si:ate ofO~ O OCPA HRH Handcart (Fhh)-
Apri> 8, 1979 PNO-79-H UQEOlATE PRELJNr WRY t1OTIFICATION