ML20059E082

Corrected Semiannual Radioactive Effluent Release Rept for Second Half of 1989

ML20059E082
Person / Time
Site:	South Texas
Issue date:	12/31/1989
From:	HOUSTON LIGHTING & POWER CO.
To:
Shared Package
ML20059E075	List: ML20059E082 ST-HL-AE-3546, Forwards Corrected Semiannual Radioactive Effluent Release Rept for Second Half of 1989
References
NUDOCS 9009100019
Download: ML20059E082 (4)

Text

p  :

E.

" ' . ATTACHMENT l'

ST HL AE-1g54 6 PAGE.J- 0F Ll . *

,"7' -

-l 2 e

2.11 Lower Limit of Detection (LLD)

The LLD (an a priori limit) is defined as the smallest concentration of radioactive material in a sample-that will yield a net count, j above system background, that will be detected with 95% probability,-

and only.a 5% probability of falsely concluding that a blank.

observation represents a "real" signal. l 2.12 Dose to MEMBERS OF THE PUBLIC On Site-MEnBERS OF THE PUBLIC due to their activities within the SITE

' BOUNDARY may_ be subject to direct radiation exposure at extremely

. low levels.-MEMBERS OF THE P6BLIC are permitted to skirt the: site

~

boundary (1500' meters out) on Farm to Market Highway #521 for about '

five miles. MEMBERS OF THE PUBLIC are also allowed access to-the' visitor's center which is within the site boundary-about 1600 meters t

.from either Unit 1 or Unit 2. =i Appendix A is.a summary of the dese rates. measured by TLD's placed within the: Protected Area fence around the Units ~(about 133 meters from either unit)'. The average dose rates measured by.these TLD'ai i are listed-in Appendix A.page.152.. The average dose rate measured in the vicinity.ofsSTPEGS by the RadiologicalmEnvironmental Mon.toring Program was about 15.4 Frem/ quarter in 1986,Ethe: year : ..

1 before plant operation began. Hence the average dose rate near the plant was lower than the pre-operational dose rate withithe exception of one measurement station (location 1-03'of ther ,

c.ccompanying figure). -This station is midway between :the securityJ fence surrounding Unit 1 and a radioactive waste loading area.The -

dose rate in this area.is-about 31.8 mrem / quarter. Normalsvisits.of-a'few hours to.the visitor's center,' tours of?the: site (typically outside the Protected Area fence) or daily trips past=the' site,on ,

L FM-#521 should'have resulted in'an annual maximum dose to a: MEMBER OF.THE.PUBLIC of less than 1: mrem / year. .The following example calculations support this assertion.

'i i-4 1'

i 1

y l 9009100019 900828

-PDR ADOCK 05000498 R. Phn' 9

,7 .

, ~1 Lc ., ,

[. .. .

-+,

AlinUHMENT 1. I 2 ' ' ,~ ST-HL AE 3546..

u PAGE 3 0F M -

.i*

l

-Dose to MEMBER OF PUBLIC at Visitor's Center

~The dose to a. MEMBER OF THE PUBLIC.at the visitor's center may be.

estimated as follows:

' dose rate = 0.0 mrem / quarter

• 0.00046 quarters /hr * (133/1600) ,

= 0.0 mrem /hr.

where 133 = distance from Unit I center line Protected-Area fence,.  ;

meters 1600 = distance to visitor's center from Unit 1, meters l?

,  : dose = 0.0 mrem /hr

• 2 hr/ visit *:2 visits /yr .i

= 0.0 mrem s,,.

a; l

Dose to MEMBER OF THE PUBLIC Touring the Site The dose to a MEMBER OF THE-PUBLIC touring the si+.e outside of the.

Protected Area may be estimated as follows: 1 0 dose' rate _= 16.4/4 mrem / quarter *' 0.00046 quarters /hr'

= 0.00189 mrem /hr g

where = 16.4 mrem / quarter is the dose rate atilocation 1-03 and-is taken as the worst possible exposure case j'

(31.8-15.4 mrem / quarter).

4' =

is the reduction f6ctor between the measurement location- 1 y and the Protected Aria fence. '

l.

dose = 0.00189 mrem /hr-* 0.5 hr/ tour _*-2 tours /yest 1

, = 0.00189 mrem /yr

. 7 1

e

. I

. 'b, m

t

~

l

-=; .

E.4 . ATTACHMENT l-

. - ST HL AE 3M b

.0F 4 i

'l PAGE._2 I

y . 1989 STPEGS PROTECTED AREA TLD MONITORING STATIONS-(PAMs)-

'm Annual Average

- STATION 1st qtr 2nd qtr 3rd qtr 4th qtr by by annual NUMBER average average average average . quarter month totai

====- .

=======================================================================47.3 1-01 E11.0 11.6 12.0 12.7 11.8 3.9 1-02 11.1 11.7 12.4 14.5 12.4 . 4 .1 49.6 1-03 22.9 21.0 26.3 56.9 31.8 10.6 127.2 ,

1-04' 13.2 13.3 13.6 14.0- 13.5 4. 5- 54.1 05 11.2 11.7 14.1 13.0 12.5 4.2 50.0 '

12.5 11.6 3.9 46.4 06 11.5 11.6 ,

10.9 1-07 l'O . 5 11.4 11.1 12.0 11.3 3.8 45.1 ,

1-08 11.6 11.5 11.6 15.1 12.4 4.1 49.7 ~!

1 09 11.3 11.1- 11.2 12.0 11.4 3.8 45.7 10.4 11.5 11.0 11.9 11.2 3.7 44.7 1-10 45'.4 1-11~ 10.6 11.6 11.3 11.9 -11.4 3.8 10.8 22.0 12.0 13.2' 12.0 4.0 47.9  ;

1-12 47.1 11.8 11.8 3.9

'2-01 n/a 12.0 11.5 11.1 11.1 3.7 44.2-02' n/a 11.4 10.7 12.5 12.1 4.0 48.3 2-03 n/a 12.1 11.6 12.1 .11.5 3.8' 46.1 2-04 n/a 11.6 10.9 13.2 12.4 4.1 49.8~

2-05 n/a 12.5 11.7 11.9 11.9 4.0 47.6-l 2-06. n/a 12.5 11.2

~12.21 4.1 48.7 L 2-07 n/a 12.4 11.3 12.8 4.3 51.1

- 2-081 n/a 12.5- 12.4 13.4 12.8_

12.4~ 12.1 4.0' 48.5-2-09 n/a 12.4- 11.6 ,

NOTES : a) values are calculated from CaSO.TLD elements only (E3 & E4).

b) all.results normalized to a 91 day quarter c) no PAMs,were in place around. Unit II during the first quarter d) annual total extrapolated from the calculated monthly average

.(sum of quarter averages X 4 quarters /yr.) = (annual total) i

.(number of quarters measurements were taken) o I l

l-V k

I t-N l

l l

- 152 -

7

~

y 4 4 g Wu

• Je s ATTACHMENT l-

- - - ST-HL-/.E 35V 4, g~ E;s PAGEJA- 0F- V  ;.

- a

n. .

STPEGS. Unit I 1989 PATMS Quarterly Exposure By Station 4 I 60 -

, 55 8 1st qtr 50 /p ,

45 f 2nd qtr

, 7 40 E

l 3rd qtr .

" b 35 H b30-

=

4th qtr '

25 I

20 15 6 , , ,

I','

"I 10 l "l ?l 5- , , , , ,

e < < ,, s , s w-

'0 , , . . . . - - - 1

. 1-01 1-03 1-05 1-07 1-09 1 1-02 1 1-06 1-08 1-10 1-12 Station Number 'i STPEGS Unit II 1989 PATMS Quarterly Exposure By Station -

60 si 55 2nd qir

'50 45 3rd qtr  :

7 40 i 4th qtr l35-

$30

$25 6 20 ,

15 10 El "E Y "'El IE Ul

• IE' l IIEE l'iis .

fit id bib $D $N $D llll I';!h , $!d b!d ( !M !!!! ,

Nd , I$$ ,

Nk , $!!A .,

2-01 2-03 2-05 2-07 2-09 2-02 2-04 2-06 2-08 Station Number

,4 j

-153-

,