ML20247G488
| ML20247G488 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 04/11/1989 |
| From: | AFFILIATION NOT ASSIGNED |
| To: | |
| References | |
| RTR-NUREG-0654, RTR-NUREG-654 OL-I-MAG-064, OL-I-MAG-64, NUDOCS 8905300414 | |
| Download: ML20247G488 (6) | |
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V/#/rf ecuna UWC TECHNICA1. JUSTIFICATION
'89 MAY 23 P3 :37 echnical Justification for use of the Aptec TT-126 probe with Bieron frisk-tech p
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in Monitoring /Decon facilities.
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. :e As stated in NUREG-0654/TEMA-Rep-1, each emergency response organization should be capable of monitoring approximately 20 percent of the total resident and transient population in the plume exposure EPZ in a 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> period.
This peak popuistion tetsi has been determined to be 82,944. for the Massachusetts 10 mile i
IPZ as determined by the Evacuation Time Istimate.
Twenty percent of this amount is 16,590. Two facilities exist for monitoring evacuees within the Seabroek Plan for Massachusetts communities. Therefore, each facility should be espable of monitoring 8,295 evacuses per 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> shift.
IFF0 Guideline 85-004 designates using "a pancake type G.M. detector and a count
. rate meter or an equivalently sensitive technique" to perform personnel moni-toring. For monitoring /Decon purposes, a standard frisk entails movement of the probe approximately 180 linest inches, encompassing the face, head, shoulders, hands, elbows, knees and feet it a circular path.sbout the body.
A typical industry accepted G.M. detector sad ceint rate aster is the Iberline H.F.-210 l
I "pacake" proba with the Eberline RM-14 count race ester.
The average ef ficitner of the E.P.-210 p: ole is approx.imately 132, and the diameter of the circular probe is 1.15 inches.
The Iberline RM-14 count rate seter has a two position response switch. When switched to fast position, the response time is 2 seconds. When switched to slow position, the response time in 20 seconds, measured to 90% of the final reading.
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The Seabrook Plan for Massachusetts Communicles utilizes the Aptec FT-126 C.M.
probe with the licron frisk-tech count rate meter for personnel and equipment f
monitoring. The Aptec is s square C.M. probe 4.4 inches per side.
The average efficiency of the Aptec FT-126 probe is approximately 11.6% as decernined by New Hampshire Yankea laboratory te sting.
The Bieron frisk-tech count rate meter is equipped with a continuously adjustable response time from 2 to 20 seconds.
In comparing ef ficiencies and sensitivities between the H.P.-210/RM-14 and the Aptec TT-126/Bicron frisk-:ech, the specifications are comparatively identical for all practical purposes.
The major functiwaal differences are probe size ar.d response time. The linear'discance across the effective area of the Aptec probe is 2.5 times the linear distance across the Iberline proba.
Aptee TT-126 r-Eberline H.P. 210 4.4 inches l
u p 1.75 y inches
& 4.4 inches l
4.4 in.
1.75 in. - 2.5 l
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l Both the Aptec and the Eberline probes would be ef fective in recognizing the
'existance of contamination over a large surface, independent of rate of travel.
l However, identifying contamination'while passing the probe over a relatively small area of deposition is dependent upon effective probe area, rate of travel
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and response time of the count rate meter. With effective time being defined as
\\
total probe time over a specific point at a speelfic rate of travel and given a f
race of travel of 2 inches per second, the Eberline H.P. 210 probe vill have an f
effective time of.875 seconds, ne effectivt time of the Aptec TT-126 probe at a rate of travel of 2 inci.es per second is 2.2 seconds, nerefore, the Aptec probe has an effective time two and one half times that of the Eberline probe.
1,INEAR DISTANCE RATE OF TRAVEL ETTECTIVE TIME ACROSS TROBE i
i Aptec TT-126 4.4 inches x 1 sec/2 inches 2.2 sec.
=
Eberline R.P. 210 1.75 inches x 1 sec/2 inches
.875 sec.
=
ne Iberline RM-14 crunt rate meter response is set on slow for frisking pur-poses.
Fast respenas (2 seconds) is unacceptabic due to spurious alarming. No intermediate setting exists on the IX-14.
D e Bieron frisk-tech is continuously 1'
adjustable from 1 to 20 seconds. For frisking pusposes the Bieron response time is set to approximately 5 seconds.
Derefore, the Bicron frisk-tech responds four times faster than the RM-14 l
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When judged against the Eberline H.P, 210/AM14 combination, the Aptec PT-126/Bieron exhibits an effective time r. ore than twice that of the Iberline, and a response time four times faster; thus the Aptec could be moved at 5 inches per second and maintain an effective time equal to that of the Eberline H.P.
210.
Since the Bieron responds in one fourth the time of the Iberline EM-14, there is no compromise ir, response time. Moving the Aptec probe at 3 inches per second maintains an effective time 1.67 times that of the Iberline probe.
LINEAR DISTANCE RATE OF 'IllAVEL EFFECTIVE TIME ACROSS PROBE Eberline H.P. 210 1.75 inches x 1 sec/2 inches
.875 seconds
=
Aptec FT-126 4.4 inches a 1 sec/ 5 inches
.88 seconds
=
Aptee FT-126 4.4 inches x 1 sec/ 2 inches 2.2 seconds
=
Aptec FT-126 4.4 inches x 1 sec/ 3 inches 1.47 seconde
=
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Use of the Aptec TT-126 probe in conjunction with the Bicron frisk-tech count rate meter for a 60 second frisk (3 inches per second) compracises no FEMA stan-i dards. Efficiency, sensitivity and response are well within acceptable guidelines.
l Using these criteria, each facility within the Seabrook Plan for Massachusetts Communities can ef fectively process 8,568 evacuess per 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> shif t.
60 sec. frisk + 5 seconds in + 5 seconds out = 70 seconds 70 seconds per frisk = 31 frisks per ' hour 51 frisks per hour x 14 stations x 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> = 8,568 evacuees / facilities per 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
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