ML19339B672
| ML19339B672 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 10/31/1980 |
| From: | ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19339B665 | List: |
| References | |
| NUDOCS 8011070419 | |
| Download: ML19339B672 (4) | |
Text
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- O 2-14a 4
j The noble gas release rates stated in the objectives are based on a X/Q value fromgheannualmeterologicaldata. The dispersion factor used, 4 x 10-6 at 1046 meters, is conservative and the release rate is controlled to sec/m i
a small fraction of 10 CFR 20 requirements at the exclusion area boundary
(.02 of 10_CFR 20 = 10 mrem per year).
The dispersion factor is taken from.
annual meterological data taken at the ANO site (see ANO-2 FSAR Section 2.3.5) and is based on the majority of the gaseous activity released from the site will be released from the waste gas decay tanks and reactor building purges, within the time frame of 8 to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
2.4.3 Explosive Gas Mixture Speci fica tion _
1.
The concentration of hydrogen / oxygen shall be limited in the waste gas surge tank and ^he waste gas decay tanks'to Region "A" of Figure 2.4.3-1.
t 4
2.
When the hydrogen / oxygen concentration in any of the waste gas surge or storage tanks enters Region "B" of Figure 2.4.3-1, corrective action shall be taken to return the concentration values to Region "A"within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and a report shall be made in accordance with Specification 5.5.2.b.
3.
At no time shall the concentration values in the waste gas surge tank or waste gas decay tanks enter Region "C" of Figure 2.4.3-1, or the waste gas system shall be declared j
inoperable and a report shall be made in accordance with Specification 5.6.2.a.
j 4.
The pressure in the waste gas decay tanks shall be limited to 88 psig, whenever the hydrogen concentration is > 4% in the collected tanks Monitoring Requirement 1.
The concentration of hydrogen / oxygen in the waste gas surge tank.shall be monitored continuously with the waste gas system in operation venting to the waste -gas surge tank.
1 2.
With the waste gas surge tank hydrogen / oxygen concentration within Region "B", of Figure 2.4.3-1, during comprcssor operation, the sample line-up shall be changed to monitor the waste gas decay tank to which the compressor is dischargijg.
3.
During waste gas system operation, with the H /02 analyzer 2
l out of service, the specified sampling shall continue by taking grab samples for analysis every 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
Bases It.is expected that the hydrogen / oxygen concentration will be kept within the above limits 'and therefore not enter the flammable or detonable region con-centrations.
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2-14b These levels provide reasonable assurance that no hydrogen / oxygen explosion could occur to allow rupture of the waste gas system.
The oxygen level was set based on the lower limit of flammability (regardless of ignition energy requirements) as outlined in Bulletin 503, " Limits of Flammability of Gases and Vapors", by the U. S. Bureau of Mines.
The hydrogen level was set based on the lower limit of flammability coupled with a conservative ignition energy source level.
Extra margin was added in limiting the waste gas decay tank pressure to 66.5% of the relief valve setting, so that even if a hydrogen / oxygen burn did occur, tank overpressurization would not result.
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2-10a o
1 i
2.2.3 Explosive Gas Mixture h
Speci fication_
1.
The concentration of hydrogen / oxygen shall be limited in-the waste gas surge tank and the waste gas decay tanks to Region "A" of Figure 2.2.3-1.
2.
When the hydrogen / oxygen concentration in any of tne waste gas surge or storage tanks enters Region "B" of Figure 2.2.3-1, corrective action shall be taken to. return the concentration values to Region "A" within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> and a report shall.be'made in accordance.with Specification 5.6.2.b.
3.
At no time shall the concentration values in the waste gas i
surge tank or waste gas decay tanks enter Region "C" of Figure 2.2.3-1, or the waste gas system shall be declared i
inoperable and a report shall be made in accordance with Specification 5.6.2.a.
a.
The pressure in the waste gas decay tanks shall be limited to 250 psig, whenever the hydrogen concentration exceeds t
4%.in the affected tank.
)
Monitorin.g Requirement 1.
The concentration of hydrogen / oxygen in the waste gas surge tank shall be monitored continuously with the waste gas system in operation venting to the waste gas surge tank.
2.
With the waste gas surge tank hydrogen / oxygen concentration t
within Region "B", of Figure 2.2.3-1, during compressor operation, the sample line-up shall be changed to monitor the waste gas decay tank to which the compressor is discharging.
3.
During waste gas system operation, with the H /02 analyzer 2
out of service, the specifidd sampling shall continue by taking grab samples for analysis every 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.
BASES It is expected that the hydrogen / oxygen concentration will be kept within the above limits and therefore not enter the flammable or detonable region concentrations.
These levels provide reasonable assurance that no hydrogen / oxygen explosion could occur to allow repture of the waste gas system.
The oxygen level was set based on the lower limit of flammability (regardless of ignition energy requirements) as outlined in Bulletin 503, " Limits of Flammability of Gases and Vapors", by the U. S. Bureau of Mines. The hydrogen level was set based on the lower limit of flammability coupled with a conservative ignition energy source level.
Extra margin was added in limiting the waste gas decay tank pressure to 66.5% of the relief valve setting, so that-even if a hydrogen / oxygen burn did occur, tank overpressurization would not result, 4
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