ML20080C901

Proposed Tech Spec Changes Re Waste Gas Sys

ML20080C901
Person / Time
Site:	Arkansas Nuclear
Issue date:	08/23/1983
From:	ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML20080C895	List: 0CAN088308, Application for Amend to Licenses DPR-51 & NPF-6 Changing Tech Specs Re Waste Gas Sys ML20080C901
References
NUDOCS 8308290371
Download: ML20080C901 (7)

Text

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3.24 Explosive Gas Mixture Applicability Applies to the Waste Gas System Hydrogen /0xygen Analyzers Objective To prevent accumulation of explosive mixtures in the waste gas system.

Specification 3.24.1 The concentration of hydrogen / oxygen shall be limited in the-waste gas decay tanks to Region "A" of Figure 3.24-1.

3.24.2 When the hydrogen / oxygen concentration in any of the decay 2

tanks enters Region "B" of Figure 3.2.4-1, 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 />.

3.24.3 When the concentration values in the waste gas surge tank or

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waste gas decay tanks enter Region "C" of Figure 3.24-1, immediately suspend all additions of waste gas to the decay tanks and without delay return the concentration values in the decay tanks to within Region "A"~of Figure 3.24-1.

3.24.4 The provis' ions of-Specifications 3.0.3 and 3.0.4 are not applicable.

.i Bases j

These hydrogen / oxygen limits provide reasonable assurance that no hydrogen / oxygen explosion could occur-to allow'repture of the waste gas i

decay tanks.

The oxygen level was. set based on the lower limit of flammability (regardless of ignition' energy requii'ements) 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.

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l 4.28 Explosive Gas Mixture Applicability Applies to the Waste = Gas System hydrogen / oxygen analyzers.

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To prevent accumulation of explosive mixtures in the waste gas system.

Specification 4.28.1 The concentration of hydrogen / oxygen in the waste gas system shall be monitored continuously by either the primary or redundant waste gas analyzer during waste gas compressing operations to the waste gas decay tanks.

4.28.2 During waste gas system operation, with no H /02 analyzer in 2

service, without delay suspend all additions of waste gas to the decay tanks or take 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 />.

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Bases To assure that the hydrogen / oxygen concentration will be kept within the above limits and therefore not enter the flammable or detonable j

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3/4.11 RADI0 ACTIVE EFFLUENTS 3/4.11.1 EXPLOSIVE GAS MIXTURE LIMITING CONDITION FOR OPERATION 3.11.1.1 The concentration of the hydrogen / oxygen shall be limited in the waste gas storage tanks to Region "A" of Figure 3.11-1.

APPLICABILITY: At all times.

ACTION:

a)

When the concentration of hydrogen / oxygen in the waste gas storage tanks enters Region "B" of Figure 3.11-1, corrective action shall 1

be taken to return the concentration values to Region "A" within l

24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, b)

When the concentration of hydrogen / oxygen in the waste gas surge tank or any of the waste gas storage tanks enters Region "C" of Figure 3.11-1, without delay suspend all additions of waste gas to the waste gas storage tanks and return the concentration values in the storage tanks to within Region "A" of Figure 3.11-1.

f c)

The provisions of Specifications 3.0.3 and 3.0.4 are not applicable.

SURVEILLANCE REQUIREMENTS 4.11.1.1.1 The concentration of hydrogen / oxygen in the waste gas holdup system shall be determined to be within the above limits, with the waste gas system in operation, by continuously monitoring with the hydrogen / oxygen monitors required OPERABLE by table 3.3-12 of Specification 3/4.3.

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TABLE 3.3-12 RADI0 ACTIVE GASE0US EFFLUENT MONITORING INSTRUMENTATION Minimum Channels Instrument Operable Applicability Action

1. Waste Gas Holdup System Explosive Gas Monitoring l

System

a. Hydrogen monitor (1)

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b. Oxygen monitor (1)

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• During waste gas holdup system operatior, (treatment for primary system off gases.)

ACTION 1 - With both channels inoperable, operation may continue provided grab samples are taken and analyzed 1) every 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> during degassing operations and 2) daily during other operations.

3/4.11 RADI0 ACTIVE EFFLUENTS BASES 3/4.11.1 EXPLOSIVE GAS MIXTURE 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 within the waste gas storage tanks.

These levels provide reasonable assurance that no hydrogen / oxygen explosion could occur to allow rupture of the waste gas storage tanks.

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.

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