ML20237F679

Revised TSS 15.6.14A, Activated Carbon Filter In-Place Leak Test

ML20237F679
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Issue date:	03/26/1985
From:	COMMONWEALTH EDISON CO.
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ML20237F603	List: ML20237F601 ML20237F636 ML20237F664 ML20237F679 ML20237F693 ML20237F727 ML20237F743
References
TSS-15.6.14A, NUDOCS 8708210535
Download: ML20237F679 (6)

Text

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MANDA703Y LN-HAND PROCDim ACTIVATED CARBON FILTER IN-PLACE LEAK TEST TSS 15.6.14A i

TABLE OF CONTENTS SECTION TITLE PAGE DATE REVISION Table of Contents 1

MAR 2 61995 5

Introduction 2

MAR 2 61995 3 Reference Documents Testing 3

MAR 2 61985 3

4 04-16-84 2

5 MAR 2 61985 4 Data Requirements Table 1:

Evaluation of Test Results HEPA/ Charcoal filter Systems 6

MAR 2 61985 5 Surveillance Requirements I

f Date Surveillance Performed Surveillance Performed on Unit #

G708210535 070813 DR ADOCK 0500 5

This stadure contains 6 pages.

d 8 M/M APPROVED y/ g,[g 0009T 1

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TSS 15.6.14A Rev. 3 MAR 2 61985 ACTIVATED CARBON FILTER IN-PLACE LEAK TEST' 1.

INTRODUCTION

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1.1 Technical Specification Surveillance Requirements i'

1.1.1 Essentially, carbon filter testing consists of injecting a

!I refrigerant tracer gas (Refer to test contaminant, par. 3.1.2) into the air stream upstream of the adsorber bank. Tracer

.i concentrations are determined upstream and downstream of the bank, and penetration (percent leakage) is determined from the t'

ratio of downstream to upstream concentrations. Results of the test may appear in one of two ways. When there are banks of new carbon, no tracer should be detected downstream of the 1

carbon bank unless a leak is present.

It should be possible to test for an hour or more before breakthrough of the tracer For aged banks of carbons the breakthrough time may be 7

occurs.

short enough that the beginning of breakthrough will be seen t

during the test.

In this second case the penetration can be g

projected back to the start of the test (time zero) to determine what the leakage would have been before breakthrough occurred. If multiple adsorber stages are used in series, each stage should be tested individually in such a manner that the tracer gas is not allowed to pass through any adsorber stage except the one being tested if possible.

(1) After every 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of charcoal adsorber operation, or (2) at least once every 18 months, or (3) after any structural maintenance of the charcoal adsorber housings, or (4) following painting, fire or chemical release in any ventilation zone. communicating with the system, (5) after each partial or complete replacement of the filter bank, surveillance shall be perf ormed per Table 1.

a.

Instrumentation, equipment, and procedures for the above testing shall generally conform to the recommendations found in ANSI N510.

2.

REFERENCE DOCUMENTS ANSI N510 - 1975, 1980 Testing of Air Cleaning Systems The American Society of Mechanical Engineers Technical Specifications 4.e.8. A.4, 4.13.2.B, 4.17.1.6 Industrial Ventilation 0009T 2

0049A j

1

'YSS 15.6.14A L*

Rev. 3 MAR 2 61985 3.

TESTING.

3.1 Test Requirements 3.1.1 On-site Facility requirements 120V, 60Hz Power and 60 psi i

compressed air.

3.1.2 Test Contaminant

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The test contaminant shall be tracer gas R-112 tetrachlorodifluorothane CC1 FCCl F or 2

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R-11 trichlorofluoromethane CCLpF.

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l 3.1.3 Acceptance Criteria In accordance with Table 1 3.1.4 Test Equipment Required 3.1.4.1 Tracer Gas Detector System q

1 This calibrated assembly consiste of a tracer gas

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detector, recorder, pump, flowmeters, and other necessary instrumentation. The tracer gas detector measures the amount of tracer in each sample taken.

The sampling and dilution system takes alternate diluted upstream and full strength downstream samples at a calibrated dilution ratio. The system has a linear response to signals less than 30% of the standing current.

3.1.4.2 Tracer Gas Generator The tracer gas generator provides the means of injecting desired amount of tracer gas into a flowing airstream. During testing, the tracer gas output shall be from 4 to 10 times the minimum workable threshold sensitivity (MWTS) of the tracer gas detector divided by the maximum acceptable leak rate, expressed as a fraction of total system airflow.

MWTS is the concentration of tracer gas which will produce a twoscale division response on the recorder of the tracer gas detector. The generator output shall be held within 1 20% of the nominal value during the test.

3.1.4.3 Fan or Auxiliary Blower The system fan shall be operational for this test or an auxiliary blower shall be installed which is capable of producing the required airflow and pressure.

3 0009T 0049A I

TSS 15.6.M8 1

Rev. 2 APR 161934 3.2 Test Methods and Results Testing methods and procedures shall generally conform to the recommendations found in ANSI NS10.

l 3.2.1 The leakage is 3.2.2 Three types of test results may be found.

'l calculated as follows:

If no downstream tracer is found, per cent leakage is 3.2.2.1 recorded at less than 2

x 100 Upstream ave. peak height x dilution ratio If a constant or variable downstream concentration is 3.2.2.2 found and the downstream tracer disappears when the tracer injection stops, per cent leakage is recorded as

)

Downstream averaae peak heicht x 100 Upstream average reading If downstream concentration rises during the test and 3.2.2.3 continues to rise when tracer injection is stopped, calculate leakage for each time interval from equation (1) below. Plot leakage vs time for each downstream sample and extrapolate curve to time zero i

as shown in the following graph.

As an alternate the downstream peak heights mzy be plotted directly on the chromatograph where they appear and plotted back to time zero. Leakage is then calculated from (1) below using the peak height at tinie zero.

(1) Downstream peak heiaht x 100 Upstream peak height x 100 dilution ratio i

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l Time (minutes) i Determination of time zero leak by extrapolation from concentration data.

4 0009T 0049A

TSS 15.6.14 A 1

Rev. 4 MAR 2 6 285 3.2.4 If any leakage obtained from 3.2.2.1, 3.2-.2.2, or 3.2.2.3 is greater than the value specified in the test procedure or 3.1.3, then locate leaks; repair and retest.

1 4.

DATA REQUIREMENTS 4.1 Comp'lete test report shall be furnished as outlined in ANSI N510.

Air flow and AP.across charcoal banks shall be included.

Documentation must be provided to certify instrument calibration.

1 5.

Evaluation of Test Results i

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i Tech Staff Engineer Date n

Tech Staff Supervisor Date i

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