ML19290E631
| ML19290E631 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 03/03/1980 |
| From: | GEORGIA POWER CO. |
| To: | |
| Shared Package | |
| ML19290E628 | List: |
| References | |
| NUDOCS 8003140311 | |
| Download: ML19290E631 (4) | |
Text
e
'd A R C II 1, 1000 SU P pLEttE!!T AL 'I AR R AT T "E S U'"1 A R Y TO LER 50-1?1/1970-O'1 Rev. 9 EDtII!!
I.
H AT C !! 'IU C L E A i! - U!!IT 1 4 U '!I T 9 ?! O*190 U T I t! E RADIOLOGICAL E!! VI R 0 f!'4 EN T AL OPERATI?iG A!!O!1 ALOUS ME A SU9 E!!E'IT R E *'O R T This report which supplenents the provious submittain of LER 50-121/1079-021 provides data on tritiun levels in ground water samples taken at the discha*g7 of the east subsu" face drainage syster and tu? incidents 9here condensate storage tank 4ater leaked onto the ground.
The sample taken at the discharge of the east subsurface drainage systen shows an inc"ev in the tritium concentration from 109 pct /1 to 5740 pei/1 du"ing.. i e period fron 1-?1 90 to ? 90 90.
Another sample was taken on 1 - 2 9 ')
and the tritium results were 994 pCi/1.
This value is avr~ ne +
this location.
These v a l. u e s a"e wel.1 bel o -
the 3.0 94 pet /1 c po
- level in Table 1.'-3 of the E.T.S.
There continues to be no algnificant inonet on the public haalth and safety due to these readings.
Such releases are minuscule and results in insignificant d o s,e s to the public.
The dese to an individual in unrest"icted a"cas due to these "el. eases is very conservative 1v e s t i. m a t e d by assuming that all tha unte" that this individual drinks is taken from the east outfall in spite of the difficulty this individual would have in raaching this relatively inaccessible location on plant naonanty.
The hichast a v e "a e.e concentration of trittun from thia outfall ove" any 1 nonth paniod occurred cron t v, 5 t_;v... i n g of Decembe" 1.o70 through the end of 7
Februn"y 1090.
This average
- 1. s 1.10 X
10 pet /1.
Using the a s s u m p t i. o n s and constants fron Regulatory Guide 1.100 Rev.
1, this average releasa t ra n s 1. a t e s to a qua"teriv dose of 0.0707 neen.
The dose linit from apnendix I to 10CFR50 fo" Itquid cerluents is 1.5 nren to an individual fo" any qua"ter.
The
!!PC fo" t"ittun in unrestricted areas as given in
- 1. 0 0 F R 9 0 in ? X 106 pCi/1.
The epa pernits an annual average concent"ation of 2 X 1. 0 4 pCi/1 or t"itium in drinking water see 30CFR141.16 The discharge to the east subsurface d " a i n a p' e system has been srmoled for tritium since preoperation.
A clot of tritium cone.ntration
""on the east subsu" face crainage system is a t t a c h. e d.
A d d i t i. o n a l sanolen have been taken at the east discharge and sent to an independent laboratory for analysir It is very unlikely that the increase in activity at the east drainage noint on Feb"uary ?0, 1980 is from the two mont recent leaks described belo9.
The Line C"ame is much too sho"t for the water to travel thru the elav fill to tho drainage system.
Also the volume o r condensate wate" released in each of these two incidents is s m a l. l..
It is more l ik e l y that the much lancer release of condensate untor on Decenher 3, 1970 crom the 3eak at the Unit I condensate transfe" pumo would have eaur +1 this increase.
On Februa"y 4,
1080 at about 10: 30 A.M.
3 Laboratorv Fo"eman was na k i n r.
his daily outside rounds and noted a verv small leak on the "B"
condensate taansfer punp of Unit I.
The leakage
" ate was approximatelv 4 0 T11nute.
I' upp nt I
March 3, 1980
The Forenan noticed tut the ground on one side of the concrete 31ah on which the punpa are mountnd was discolored and noist.
The Lab Forenan notified the Shift Sunervisor of the leaking nunn and the "A"
pumo was placed into searice within P
or 3
minutes of notification of the Shift Supervisor.
Seven soil samples around the punp slah were taken; a 500 m1 water sanple was taken from the energency catch basin. A c onol e te isotonic analysis was p re f o r:n e d on each of these samoles utili.zinq the GefLI) system.
Act.vities of the water and soil samples are as follows:
Water Sanntes Gamna Isotopic 14.80 E7 uCi/mi Tritium 9. 6 14 El4 pCi/1 Soil Samples (Average of analysis results)
Co60 - 6.02 E-6 ue/gm Cs 197 8.18 E 6 uc/gn C s 13 Il - 1.19 E9 uc/gm Mn 5 II - 5.16 E6 uc/gn
%n66 - 7.!!6 E-6 ue/gm Based on the "esults of the isotopics a decision was made to dig the contaminated soil. and ship for burial.
Three (3) 55 gallon drums of contaminated soil ve"e dug and shipped.
On February 5, 1080 at 2005 the "A"
pump was taken out o# service and the "B"
punp was placed in service.
The leak on the "R"
pump had been repaired prior to being placed back into service.
It is estimated that about 22 gallons of condensate storage tank water was released into the soil.
Based on this estimate and the isotopic composition, the total activity is as follows:
Isotopes Activity Co60 5.85 uCi Cs137 B.RR uCi C s l 3 'l 1 1.119 uCi M n 9 #3 23. 0 '3 uCi 2n65 7.15 uCi H3 P.12 uCi 1D7 uCi Release Total 4
On Februa y 16,'
1090 at approximately 10:10 A. '4.
the chemistav technician obtaining the daily CST (Condensate Sto-age Tanki sanulea reported the "B"
condensate t"ansfer punp on Unit TI as possibly having a slight water leak between the suction line isolation valve and the pump.
It was impossible to positively identify the leak ou sight as the samples uere pulled during a period of heavy rain.
Supplcment March 3, 1980
The Unit II Shift Fo-eman was notified of the incident and upon i
further investigation it was confirmed as C9T water leaking.
The estimated leakage rate was 0.G gpm.
A one
- 1. i t e r sample was takon at 11:40 A. 't. and the line isolated at 11:45 A. 'i.
A gamna spectroneter a n a l. y s i s was perforned on the sample.
The isotopes identified and concent"ation are listed belou.
Isotoon Concentration QUA"ITY R r L E A.S..E D.
F-19 3.48 E-6 uCi/ml 0.79 uCi Xe-135 1.90 E-7 uCi/n1 0.03 uCi H
~4 6.88 E5 pC1/1 147.00 uCi Total 14'>.75 Subsequent samples of the soil from the area around the leak oroduced no detectable activity when subjected to t'a m n a soec analysis / 't h i c h was expected since the water itself was of extremelv low activitv i Total volune released is estinated at less than 55 gallons, wh-h was calculated using the follouing information:
1.
Estinated leak rate was 0.5 gpn.
2.
To'al clapsed time of the leak was estinated at 109 ninutes.
The pump was inspected at approximately 10:00 A.M.
at which time it uns not leaking.
As stated previous 1v, the line uns isolated at 1.1 : ' 5 A.M.
Hence, from 10:00 A. 't. to 11:45 A.M.
is 105 ninutes maximum time the line could have leaked.
After isolating the cunp and associated piping, maintenance p e r s o n n e l.
found the leak to be in the suction line at the expansion bellows.
Water was leaking from the b e l l. o w s, running down the suction line and draining into the gravel via a suction 1ine sunnort bracket and the panp housing.
Sampics were t a '< e n from the niezomete" wells around the Unit II CST tn evaluated the effect of the leak in the a"en.
To p"eclude or reduce releases under similar circumstances, tenonaa-v confinement measures about the transfer pumps have been nade until a permanent fix can be installed.
The tempo"aav neasu"es consist o r the installation of metal reflectors to direct any sprayine
""on the pumos or re]ated plumbing to the concrete
- 31. a 5 uoon which the punos are nounted; a cuching was added a"ound the conc"ete slab to prevent runoff to the ground; the original drain to radwaste 19 still connected to the puno catch basin; a hol. ding t a n'<
was placed next to the pumos with a spillway running f"on the curbed concrete slah to the holding tank
.t o catch any wate" that ove"G owod the nuno 5asin onto the cone-ete slah.
The water on Unit I on Feb"ua y 4,
1 0'10 came over a low side of the curbing; the wate" also seeped between the curbing and the slab.
A new spillway was placed from the low side of the cur 5ed area to the holding tank and sealant un put a"ound the interface between the curb and the slab.
On Unit TI catch has4ns a"e being installed under the bellows to catch any leakage.
This will prevent a similar occurrences f"on happening.
The normanent fix is being delayed because of diffi.culty in getting material and e n g i n e e " i n e.
problems.
It is estinated the permanent fix util completed before Juna 1080.
j Supplanent March 3, 1980
i TRITIU:1 PCI/ LITER i
8 3
8 5
7
)
N e
f I
i f ffIII
- f f
f I fffI f
f f I f 9II 2/17/78 3/28/78 3/6/78 1/29/78 11/15/78
=
12/1/78 m
1/24/79 l
2/20/79 x
3/5/79 3/14/79 i/26/79 E
1.
e3 7/11/79 dd m
c>
1/26/79 1
35 0
[
3/10/79 hm 5
3/23/79 F-r-
H-d 1/5/79
=
G 10/4/79
.54 on 10/19/79
- so 11/9/79 4
j 11/16/79 11/30/79 m
12/3/79
+7 m x
$c c- @-
12/13/79 o
Q 12/26/79 P8 1/10/80 O
t;n 1/24/80 w
o 2/6/80 2/20/80 3/2/80 8
,r:2.V.N.de141"h s- *"*~=- ' - " - ' ~