ML19321A787
| ML19321A787 | |
| Person / Time | |
|---|---|
| Site: | Brunswick  |
| Issue date: | 04/28/1978 |
| From: | Tollison A CAROLINA POWER & LIGHT CO. |
| To: | Sullivan R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML19321A783 | List: |
| References | |
| EA-80-026, EA-80-26, NUDOCS 8007240196 | |
| Download: ML19321A787 (2) | |
Text
w-Cuohna Pc,wer t. Light Company r-~~:=
= =.
_a Brunswick Steam Electric Plant
~~
P. 0. Eox 458 Southport, N. C.
28461'
~ "
~s April 28, 1978 g*
4s
}{r. R. 7. Sullikan-
~
V. S. Nucica'r Regulatory Co= mission
[
230 Peachtree Street, N. W.
~
~
I
.. Atlanta, Ccorgia 30303 I) car 11r. Sullivan:"
SUUJECI:
ESEP, Unit Nos.1 and 2 On-Site Contamination
. In accordence vitih your recuest we are providi;c the following inf ormation.
regarding an occurr,coce on April 26, 1978, which resulted in onsite,
contamination of an arca around the Radwaste Building'.
Ihic to cooldown of steam piping following auxiliary boiler shutdown
, for maintenance, concentrated vaste frc= radwaste conccetrator bloudcuns vas siphoned back through a tc=porary hose usedNor secan heating the concentrated vaste.
It was drawn into an aurmary stcz= line downstrean
.of a 50 psig regulator. During subscenent pressurizatien of the upstream sted:a lines the 'regularcr bypass, though shut, Icahed by pressurizing '
the lines downstres= of the regulator.
A 70 psig relief located at this point lifted at approxi=ately OS43 hours bicving a pertion of the vaste lying in the line out its railpipe, which is located behind radvaste
,.
- at the loading dock.
Best calculatiens indicate approxinately 200 gallons
.of vast,c was draun into the steam line, a portion"of which was blocu.s.
out the relief, =estly in a 50 f oot area around the relief.
Fortiohf s,
....3 vere spattered in adjacent areas.
, ~...
Uaste va's blown from.the line during initial lif ting only.
The te=porary hose ha$; been disconnected. -
Condensate returning to the auxiliary boiler.c:irried radioactivity 'in a conecutratien of approxi=stely 1x10 3 =Ci/=1.
The boiler was shut down for deconta=ination.
~
- Tbc resin caterial vas dispersed to the " cast and north of the nadenste
' Euilding due to a 10-15 =ph southecsterly uind.
Ini'tial conta=ination 2
Icvels ' ranged frem <1000 dps/100 cm in azcas up to 600 feet from the
~
source to approxi=stely 25,000 dp=/100 cm-in the vicini:y of.the Radcaste Euilding and loading dock.
Ey conservatively averaging the sacar surveys obt.ained fron the af fected areas, it was dctcr=ined that approxi=ately
.8 nCi had escaped.
A separate -analysis involving t.he estimated volume of resin cate' rial and the isotopic analysis of a represcatative sa=plc is shoea bc3ce:
9 a
8007 h.4019 4. g A.m.e.
-,/,
J<
.ot
/
volume of !bterial - 200 gulle=g f'
(esticated fros'radcaste data).
.~
f 7notopicknalvsis 9*
Concentration:(uCI/ml)
Isotopc_
.~
- 4. 2 51 7.6 E-4 Cr
'~
54
. 3. 3 E-3 Mn 2.1 E-4 j
S8 Co 9.3 E-5 Fe59 Co60 B.6 E-4 134
.1.5 E-4 2n65 14 E-5
'... Cs 6.1 E-5_
Cs137 Total Concen'tration 3.5 E-3 (3.5 E-3 vCi) (200 gallons) (3785 c1
) (1 =Ci
_) =.3 =Ci
~
ni-gallon 1000 pCi Contamination boundaries ucre est$blished i==ediately and deconta=ination Deconta=ination procedures ucre initiated within ene hour of the incident.
results indicated that these methods reduced overall centa=ination Icvels and similar decon'ta=ination efforts by.>75% vithin 4S hours of the i.ncident 5
cre cen unuing at this t. ice.
Sampics 'of soil, water, and vegetation vere obtained downeind fro = the cite and are presently being analy:cd.
No avidence of conta=ination vac found outside the area fences, which are vc11 withiri the site boundary.-
o-air sampler was
- operating approxd:ctcly 3000 f eet dcenwind in the direct Ja2 path of travel. The filter uas pulled on April 23, 1978 and counted.
Only two isotopes were detected-K-40 and Mn-54.
The Mn-54 was 1x10'13 pCi/nl.
- Jhcrcfore the conta=ination did not extend downwind to the air sampler.
The sitq boundary is severd thousand feet beyond the location of the air sampler.
j
/
Very truly yours, l$b~/.<!l4% /rn C. To111 son, "Jr., Manager
^.
Irunswick Sten = Electric Plant I
..DB Cbf cc:
E. R.. Banks i
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