ML20093E136

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Proposed Tech Specs Allowing Waste Gas Decay Tanks to Operate to Design Pressure
ML20093E136
Person / Time
Site: Arkansas Nuclear  
Issue date: 07/11/1984
From:
ARKANSAS POWER & LIGHT CO.
To:
Shared Package
ML20093E126 List:
References
NUDOCS 8407170385
Download: ML20093E136 (7)
v • d • e


Text

{{#Wiki_filter:- -. 3.24 Explosive Gas Mixture Applicability Applies to the Waste Gas System Hydrogen /0xygen Analyzers Obiective 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 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 hours. 3.24.3 The provisions of Specifications 3.0.3 and 3.0.4 are not applicable. Bases These hydrogen / oxygen limits provide reasonable assurance that no hydrogen / oxygen explosion could occur to allow rupture of the waste gas decay tanks. The hydrogen and oxygen limits are based on information in NUREG/CR-2726 " Light Water Reactor Hydrogen Manual". 8407170385 840711 PDR ADOCK 05000313 66u P PDR m

4.28 Explosive Gas Mixture Applicability Applies to the Waste Gas System hydrogen / oxygen analyzers. Objective To prevent accumulation of explosive mixtures in the waste gas system. Specification 4.28.1 The concentration of hydrogen /oxygan 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 4 hours furing degassing operations, daily during other operations. The analysis of these samples shall be completed within 8 hours of taking the sample. Bases To assure that the hydrogen / oxygen concentration will be kept within the limits in Figure 3.24-1 and therefore not enter the flammable region concentrations in the waste gas decay tanks. Grab Samples are to be taken every 4 hours during degassing operations when both hydrogen / oxygen analyzers are out of service. These samples are to be analyzed within 8 hours to assure that the hydrogen / oxygen concentration is within the limits in Figure 3.24-1. During other Waste Gas compressor operations the hydrogen / oxygen concentration is not as subject to change, therefore grab samples are to be taken every 24 hours. F 110bb

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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 be taken to return the concentration values to Region "A" within 24 hours, b) 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. 3/4 11-1

r I TABLE 3.3-12 RADI0 ACTIVE GASEOUS EFFLUENT MONITORING INSTRUMENTATION Minimum Channels . Instrument Operable Applicability Action

1. Waste Gas. Holdup System Explosive Gas Monitoring System
a. Hydrogen monitor (1)

(1)

b. Oxygen monitor (1)

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ACTION 1 - Wit'h both channels inoperable, operation may continue provided grab samples are taken and analyzed 1) every 4 hours during degassing operations and 2) daily during other operations. The analysis of these . samples shall-be completed within 8 hours of taking the sample. 3/4 11-2

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[ t o t 3/4.11 RADI0 ACTIVE EFFLUENTS l BASES h 3/4.11.1 EXPLOSIVE GAS MIXTURE I It is expected that the hydrogen / oxygen concentration will be kept within tha 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 hydrogen and oxygen limits are based on information in l NUREG/CR-2726 " Light Water Reactor Hydrogen Manual". Grab samples are to be taken every 4 hours during degassing operations when both hydrogen / oxygen analyzers are out of i service. These samples are to be analyzed within 8 hours to j assure that the hydrogen / oxygen concentration is within the limits in Figure 3.11-1. During other Waste Gase Compressor ( operations the hydrogen / oxygen concentration is not as subject to change, therefore grab samples are to be taken j every 24 hours. i E h t I i L f r I f l 8 3/4 11-1 I i .}}

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