ML19224A942
| ML19224A942 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 11/03/1976 |
| From: | Metropolitan Edison Co |
| To: | Mullinix W NRC/IE |
| References | |
| 1950.3, TM-0189, TM-189, NUDOCS 7906130263 | |
| Download: ML19224A942 (3) | |
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THREE MILE ISLAND NUCLEAR STATION STATION CHEMISTRY PROCEDURE N0. 1950.3 DETERMINATICN OF 15 MINUTE GROSS BETA GAMMA - REACTOR COCLANT Table of Effective P3;es h
Pace Date Revision Pace Date R evision Pace Date R evision 1.0 11/03/76 1
26.0 51.0 2.0 11/03/76 1
27.0 52.0 3.0 28.0 53.0 4.0 29.0 54.0 5.0 30.0 55.0 6.0 31.0 56.0 7.0 32.0 57.0 8.0 33.0 58.0 9.0 34.0 59.0 10.0 35.0 60.0 11.0 36.0 61.0 12.0 37.0 62.0 13.0 38.0 63.0 14.0 39.0 64.0 15.0 40.0 65.0 16.0 41.0 66.0 17.0 42.0 67.0 18.0 43.0 68.0 19.0 44.0 69.0 20.0 45.0 70.0 21.0 46.0 71.0 22.0 47.0 72.0 23.0 48.0 73.0 49.0 74.0 24.0
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is50.3 Revision 1 11/03/76 THREE MILE ISLAND !;UCLEAR STATION Determination of 15 Minute Gross Beta Gamma - Reactur Coolant Station Chemistry Procedure No.1950.3 1.0
SUMMARY
The reactor coolant system is r.:onitored for gross beta ga=a activity by counting an evaporated sample 15 minutes after sampling.
Changes in the activity are valuable aids in the determination of fuel rupture.
In cases of sudden increase in activity it is desirable to determine the isotopic composition by gama spectroscopy.
2.0 APPARATUS 2.1 Pipets
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,7 2.2 Micro pipets 2.3 Analytical Balance. _ _ _
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2.4 Drying lamp 2.5 Planchets
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3.0 REAGENTS 3.1 None' 4.0 P"0CE"URE_
4.1 Pipet an appropriate volume of the sample into a planchet.
If the pipet is designated TC, rinse it twice with demineralized water into the planchet.
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4.2 Dry under an infra-red lamp, uaol and count.
The sample nust be counted at + l minutes after completion of sampling.
Sample shculd be counte'd until 10,000 counts are accumulated or for 20 minutes, which ever is sooner.
Note that count should be at leEst I minute.
If the Grcss count rate is less than twice the background count ( h Y-A 4.3 rate.
.ine the minimum detectable ccunt rate from SCP 1950.2.2
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1950.3
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Revision 1 11/03/76 Tf the net sample count rate is less than the MCCR, substitute the MDCR for new count rate in 4.4 and report the activity as less than the value calculated in 4.4.
4.4 Calculate the pCi/ml using the following formula:
pCi/m! =
net counts oer minute (com) 9 Efficiency (dpm) X 2.22 X 106 (dpm/uCi) X volume (al) 4.5 Caiculate the standard dev ' tion as follcus:
i com (samole & bkg)
+ com Akg)
)t3 Std. Dev.
Total Time (sample & bkg)
Total Time (bkg)
=
5.0 REFERENCE 5.1 ESW Radiochemistry Manual
- clear And Radicchemistry, Friedlander, Kennedy and Miller
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5.3
. r.ual Ecok of ASTM Standards, Part 45, D 1890 5.-
HFP 1733,1706,1701,1704,1702 and 1705.
m
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m m
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2.0 g
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