ML20133N897

Procedure MCC-1211.00-00-0096, Auxiliary Bldg Ventilation Sys Acceptance Criteria for Supplemental Filter Testing

ML20133N897
Person / Time
Site:	Mcguire, McGuire
Issue date:	10/23/1985
From:	Richardson J, Smith H, Weidler R DUKE POWER CO.
To:
Shared Package
ML20133N885	List: ML20133N881 ML20133N886 ML20133N892 ML20133N894 ML20133N897
References
MCC-1211.00-, MCC-1211.00-00, NUDOCS 8510300230
Download: ML20133N897 (16)

Text

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McGUIRE fiUCLEAR STATION Auxiliary Building Ventilation System 4 Acceptance Criteria for Supplemental Filter Testing l

Document flo. MCC-1211.00-00-0096 Prepared: gy ,

-i-d #LLhs ,o n e r l

Approved: A A E s)f M r h_ z3 _g 8510300230 851028 PDR ADOCK 05000369 P PDR

McGuire Nuclear Station Auxiliary Building Ventilation System -

Acceptance Criteria for Supplemental Filter Testing Document No. MCC-1211.00-00-0096 1.0 PURPOSE The purpose of this document is to establish acceptance criteria for supplemental test procedures prepared ici- the auxiliary building ventilation exhaust filter trains at McGuire Nuclear Station.

2.0 SCOPE Acceptance criteria will be established for supplemental test procedures specifically prepared to determine airflow distribution through the HEPA bank and adsorber bank of the auxiliary building ventilation exhaust filter trains.

3.0 REFERENCES

A. McGuire Nuclear Station Test Procedures a) TT/1/A/9100/101A - Unit 1 Pre /HEPA Airflow Distribution Measurements b) TT/2/A/9100/101A - Unit 2 Pre /HEPA Airflow Distribtuion Measurements c) TT/1/A/9100/1018 - Unit 1 Carbon Bed Airflow Distribution Measurements d) TT/2/A/9100/101B - Unit 2 Carbon Bed Airflow Distribution Measurements B. " Elemental Iodine and Methyl Icdide Adsorption on Activated Charcoal at Low Concentrations, R . R. Bellamy,13th AEC Air Cleaning Conference.

C. " Removal Radioactive Methyl Iodide from Steam-Air Systems", ORNL-4040, Adams, Ackley and Browning.

D. " Supplemental Testing and Analysis of HEPA Filter Elements for ABFU-l and ABFU-2", Duke Power Document No. MCC-1211.00-00-0055, January 26, 1981.

E. " Verification of Carbon Adsorber Residence Times", Duke Power Document No. MCC-1211.00-00-0066, May 20, 1981.

F. Final Safety Analysis Report, McGuire Nuclear Station, Duke Power Co.

G. Safety Evaluation Report, McGuire Nuclear Station, U.S. Nuclear Regulatory Commission.

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. l l-i 4.0 GENERAL DISCUSSION Preoperational testing conducted on the auxiliary building exhaust filter trains was generally performed in accordance with ANSI N510 -

i 1975, Testing of Nuclear Air Cleaning Systems. A portion of this testing standard (Attachment 1) addresses three (3) separate evaluations of airflow within the filter system: (1) airflow capacity test, (2) air distribution test across the HEPA filter bank, and (3) adsorber residence time calculation.

Recent analyses of the preoperational test data have~precip.itated the need to evaluate filter train airflow performance with respect to the

! 1980 edition of ANSI N510. Comparable sections of this current standard (Attachment 2) address testing of filter system airflow in a different j manner than the 1975 version. The 1980 outline procedure for evaluation t

of airflow includes: (1) airflow capacity test, (2) air distribution test through HEPA filter banks, and (3) air distribution test through i

adsorber banks.

The basic differences in the two (2) test methods are relatively straight-forward. The 1975 edition specifies measurement of HEPA filter airflow distribution to be performed upstream of the filter bank, while the 1980 edition recommends the HEPA measurements be taken downstream of the filters. The 1975 edition requires a verification of adsorber residence j time based on calculated average velocity, while the 1980 edition specifies l the need to determine the actual airflow distribution through the adsorber i bank.

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The supplemental test procedures in Reference A have been prepared for the purpose of obtaining additional data required for the 1980 test methods. As set forth in the purpose statement, acceptance criteria for i

the supplemental testing will be established in the following sections of this document.

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i 5.0 PRE 0PERATIONAL TESTING RESULTS An understanding of the preoperational test results and conclusions is relevant in developing acceptance criteria for the supplemental test

procedures. A brief review of the essential steps is as follows

1) Preoperational Airflow Capacity Test - System volumetric

flow rate was verified to be within design parameters.

2) Preoperational Air Distribution Test Across HEPA Filter Bank - Velocity measurements were recorded at the upstream i face of each prefilter cartridge. The HEPA filters and prefilters are mounted back-to-back on a common frame (see l Attachment 3). This arrangement precludes velocity measure-

] ment at the upstream HEPA face. Several velocity measurements varied from the average by more than the recommended 220%

, tolerance. High and low extreme readings typically were on the order of +1007, and -60%, respectively, when compared to the average value. This anomaly was evaluated under laboratory conditions by subjecting identical HEPA filter media to even wider variations in airflow while monitoring D0P removal I

efficiency. The evaluation of the test data (Reference D)

{ concluded that overall effectiveness of the HEPA filters was not compromised by the observed velocity distribution.

3) Preoperational Adsorber Residence Time Calculation - Verification of the adsorber residence time based on calculated average velocity and effective screen area was documented in Reference

E. Resulting values were within the tolerance recommended in

the 1975 testing standard.

6.0 ANALYSIS OF SUPPLEMENTAL TESTING Supplemental testing will be conducted to

(1) verify airflow capecity, i (2) determine air distribution through the HEPA bank, and (3) determine air i distribution through the adsorber bank.

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! Acceptance criteria for the airflow capacity test as stated in ANSI N510-1980 is that flow shall be within 107,of system design flow. This criteria 6 will be utilized in evaluating the supplemental testing. ,

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6.0 ANALYSIS OF SUPPLEMENTAL TESTING (con't) l Acceptance criteria for the HEPA filter bank air distribution test as stated in ANSI N510-1980 is that all velocity readings shall be within 20% of the average velocity measurement. This criteria will not be utilized in evaluating the supplemental testing. Based on testing and i analysis of specific HEPA elements in Reference D, acceptance criteria will be based on limits of observed velocity corresponding to limits

! established through laboratory testing. These velocity limits are 70 feet per minute minimum and 1135 feet per minute maximum, and will be used to evaluate velocity measurements taken downstream of the HEPA j bank. If observations fall within the stated limits, then no corrective action will be necessary relative to the HEPA bank other than documenting the findings in the appropriate FSAR table. Velocity measurements taken upstream of the prefilter are for information only and will not be l evaluated against the criteria.

i Acceptance criteria for the adsorber bank air distribution test as stated

, in ANSI N510-1980 is that all velocity readings shall be within 20% of .

the average velocity measurement. If the observed airflow distribution is within the 20% tolerance (either upstream or downstream),.then no i

corrective action will be necessary relative to the adsorber bank.

If the airflow distribution is outside the 20% tolerance, then the following criteria will be utilized to evaluate the test measurements.

1 In Reference B, a 2 inch bed of impregnated carbon exhibited essentially j constant removal efficiency for methyl iodide and elemental iodine j throughout a superficial velocity range of 20 feet per minute to 200 feet per minute. This phenomenon is substantiated in Reference C under j more severe temperature and humidity but to a lesser velocity variation.

! Based en the 20-200 fpm range and a nominal superficial average velocity of 40 fpm, the extreme readings could range from a maximum of +400% to

, a minimum of -50% with no exoected loss in efficiency. If airflow distri-

) bution through the adsorber bank is outside the 20% tolerance but within j the +400% to -50% range, then the pe'riodic carbon sampling method and/or frequency will be conseratively adjusted to compensate for abnormal

} weathering rates that may occur in the regions of higher velocity.

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6.0 ANALYSIS OF SUPPLEMENTAL TESTING (con't)

The airflow distribution through the adsorber bank is anticipated to be well within the limits established in the p eceding paragrach. In the remote event that observations are outside the established criteria, then a comprehensive review of accident analyses will be performed to realistically assess benefit expected from these filters in an emergency situation. Although the NRC credited these filters with 90% elemental iodine removal efficiency in the McGuire SER (Reference G), the FSAR analyses (Reference F) do not assume removal credit. Therefore, a reduction in filter effectiveness will not increase the exposure values presented in the FSAR. Realisticallg. any level of filter efficiency will reduce potential radiation axposure. Yowever, this aspect of filter performance has no effect on plant operability.

7.0 CONCLUSION

S Acceptance criteria for airflow capacity test will be 105 of systen design flow. Design flow for Unit 1 is 54,000 cubic feet per minute. Design flow for Unit 2 is 43,000 cubic feet per minute.

Acceptance criteria for HEPA filter bank air distribution test is to verify that velocity measurements are within the range of 70 feet per minute to 1135 feet per minute when measured downstream of the HEPA filters.

Acceptance criteria for the adsorber bank air distribution test will be applied in three (3) succeeding steps as follows:

(1) If velocity readings either upstream or downstream are within 20~ of the average measu. .ent, then no further action is necessary.

(2) If velocity readings are outside the 20 tolerance but within a range of +400% to -50% of average, then periodic carbon sampling methods and/or frequency will be conserva--

tively adjusted to account for the observed profile.

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7.0 CONCLUSION

S (con't)

(3) If velocity readings are outside the +400% to -50",

tolerance, then a realistic dose assessment will be performed to evaluate the filter's contribution to radiation exposure reduction.

None of the above acceptance criteria have an effect on plant operability.

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Attachment 1 ^

{ Page 1 of 2 I

AMERICA!J ttATIO*JAL STANt1MtO MCC-1211.00-00-0096 TESitT4G Of tiUCLCAH Am CLCArJING SYSTCr.'S ANSI t;5tC-1975 1

6. FinalIcak rate ofmounting frame.

7. Test data. achieved,stop test and notify Owner. Check for stable S. Instrument calibration data. fan operation car a periolyf at lost 15 ndmucs.

9. Signature (s) of test pcisonnel, 5. Upon successful comp!etha of step 4, add

10. Date of test.

artificial resistance to the sy, tem by blanking off

11. Distribution of report.

3 filters and pressurize space until a pressurc drop of et

! 8. AIRFLOW CAPACITY, DISTRIBUTION, AND Icast 1.25 times the design dirty.Giter pressure drcp RESIDENCE TIME TESTS ' for the system (as specified in the test pro:cdure or projcct specifications) is achieved. Check for stab!c 1 7 8.1 Purposa fan operation over a period of at least 15 minutes. If the required dhty. filter system airflow cannot b:

nese tests are used (1) to verify that the specified ** *** ' I """

volume Sowrate of air can be achieved with the fan

6. Repeat stepas 5 usint; sufficient artificial resistance t furnished, under actual fic!d conditions at maximum and minimum filter pressure drop;(2) te verify that to produce a pressure drop of about 50% of that of step 5; check fan for stab!c operation over a period of aisflow distribution across cach filter oratadsorber Icast 15 minutes, in each stage is reasonably uniform, relative to the aver-age flowrate in the total system;and (3) to verify 8.3.2 that Air Distribution Test Across HEPA Filter Ban 3 the residence time of each adsorber cell, based on1. If total system airnow capacity meets specinca,

! actual volume Howrate of the system, is m accord. tion rc9uirem:nts (Par. S.3.1), make an anemometer ance with specifications. The test is made only read. duringmg upstream of the face at the center of ca:h acceptance res ting following originat installa tion, mod. A "* "" '## "I'

, ification, or major repair of the air cleanin; sptem.

2. Calculate average velocity .. the housms from 8.2 Apparatus (Sec Section 9, ACClli inaustrict the equation:

Ventil: tion)

1. Standard pitot tube, y , Ty Vr

2. Inclined mat.orneter, n

3. Aneroid type pressure gage. where F = average airflow velocity through the i

' housin;;

4. IIeated wire or heated-thermocouple anemome.

ter having calibrated accuracy of at least 3% of full Vr = individu.d anemometer readings; scal: reading. Calibration sha!! be verified before start n = number of anemometer r= dings, of test.

3. All readings shall be withini207, ef the average

-8.3 Pmedum velocity calcubted from equation (4). !! the selocity i at any filter vais from the average by more than 8.3.1 Airflow Capacity Test 207e notify the Ca ner.

1. Install all system components, 8.3.3 Adscrber Residence Tim < Calculation. Calc j 2. Start system fan. residence time et the adsorber stage from the equa.

tion:

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3. Make a pitot. tube velocity. traverse in accord.

ance vdth Section 9 of ACGlilIndustrial Ventilation. . f. , nNr (A - b) j ne traverse should be made at a point in the duct 28.SGs (5)

! where airflow velocity is 1000 fpm or more, and,if y,.here T= residence time, seconds; possible,where velocity measurernents can be made at n = number of ce!!s in system; least 7.5 duct diameters downstream of any air 0cw' N= number of adsorbent beds per cell (sce disturbance. If there is no place where the airnow is l'in. 2, CS S);

greater than 1000 rpm, use one of the other methods t = tidekness of adsorbent beds, inches; i as described in Section 9 of the ACCll! Industrial Vcndladon, A = gross area of all adsorbent. bed screens (in.2 of one cell; i

I 4. Calculate system vohrmc~ airflow in accordance b = area)of baffic, mar;pn, and blank a I with Section 9 of ACGl!!Industrict Ventilation, com. all adsorbent bed scicens (in.') of 0"'

cell;

! pare with the value required by project specifiestions, j and adjust system,if possible, to achieve the specified 'O = vehnnetric Dow rate of system, from Par.

volume flow rate. If the specified v.itue cannot be 8.3.1 step 4 (cfm);

s = number of screens of one cell.

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Attachment i Page 2 of 2 MCC-1211.00-00-0096 AP.'EnlCAr;(J ATIOrJAL STAR DARD TESTir4G OF r UCLCAR AIH CLEArgir;O SYST CMS Ar;03 i:Sto-MS Actual residence time shall be within 20% of the for the fint bank of IrrPA filters, it can ie 25 design value. sumed ta be 2dequate for the fint ::dscrl'er sige dowrstreant. If the system ccma ns a S.4 Report secorut t,ank of ilLPA fincts. the DOP rnast Le injected at a point tetween the tv.o IIEPA A written repert shM1 be furnished to e!! persons d:nts in order to introaace sufficient :eresol speciGed in the test procedure. The report shall in. to the second tank for a valid test.

clude as a minimum: 2. In some systerns it may le necessay to n,ct i* Titic oridentification of test series

• Do? upsucam of a L:A of :Jso+cn i,n cect

2. Job number or Purchase Order, to chat!cn;e the llEPA f lters downstream.or to

3. Test apparatus. inJcct a refri crant mumcarbon):as urstresin of a bank of IIEPA niter: in order to Int a

4. Actual airDow rate threugh system and un't. bank of adsorters. It has t>een shown that Lior S. Actual airSow velocity at cach test point' ***"**"**""'"*' """# "' ' " #

average system cirSow velocity, and maximum plus*

. that refri;crant gases have no adverse sffect on llEPA tillers.

and-minus deviations from average ai1Gow velocity (Par.S.3.2). 0.3 Apparatus

6. Caku'ated average system residence time (Par. 1. DOP generator (See Par.10.4.1);

8.3.3). 2. Penetrometer (See Par.10.4.2);

7. Nonconformances discovered during test and 3. System ran or auxiliary blower capable of name of parties to whom reported.

jL 8. Conclusions aad recommendations.

producing the airCow and suction pressure specified in the rest procedure.

9. Instrument cdibration data.

10. Signature (s) of test personnet. 9.4 procedure

11. Date of test.

12. Distribution of report. 1. Connect DOP generator to bJcctbn port, stat system faa or auxtiiary blower.

9. AIR-AEROSOL f.ilXtf1G UNIFORf.itTY TEST 2. Connect penettometer to upstream sample pcrt.

Calibrate instrument against its built.in standard in ac-9.1 Purpue cordance wi'h the instrument manufacturer's instruc-tions.

His test is a prerequisite to the tests of Sections

3. Start DOP inJcction, adjust gcncrator to provide 10 and 12,in.ph:e leak tests of liEPA fdter and ad-sorber banks, r:spectively. The purpose of the test is a con:entra: ion at the upstream sample point of approximately 4 times the background dust concen.

to verify that tracer (DOP or refri;erant gas) injection tration.

and sample ports are located so a., to provide proper

4. Make concentration readings in a sample plane mixing of the tracer in the air approaching the com- parallel to and approximately one foot upstream of ponent stage (llEPA Glter bank or adsorber sta;c) to the fdters. A!!ow instrument to stabiize before taking be tested. or the sampic planc. The test is made only readin;s. Record readmgs. For systems of less than upon comp!ction of initial system installation, modi-10,000 cfm insta!!cd capacity, divide the sampic plane fication, or major repair, and is not required cach time an in place test of the 61ters or adsorbers is made, into ten equal areas and take one scading at the center orcach arca.

A valid in. place test is not possible without a uni.

For systems of 10,000 cfm instal!cd capacity and form tracer. air mixture.

larger, take one reading opposite the center of cach 0.2 Summary of f.icthod fdter*

5. Calculate average concentration from the equa.

DOP acrosol is introduced into the air stream at a tion:

previously selected injection point. Acrosol concen.

tration readings are ta'<en across a planc parallcl to, C, ,- Er" C# (6) n and a short distance u;istream of the IlhPA fdter where b average c necmration reading; bank; the uniformity of t!iese readings establishes the ace:ptability of the injection port location. C, = individual concentration readings; NOTES: 1. If the synem has more than one litTA filter n = num'ver of seadings taken.

bank cr rnore, than one ad oiber stne. a separate tracc. in,eetion port ts reqmred for 6. R(: cat sicps 4 and 5 in a planc perpendicular cach tank and therefore a separate air sesosot to the d.1:t, passing through.the downstream sampic rnhing test is reqaired for eJCh injection pott pomt.

and fdter bank. lf air-acrosolmhind si aJcquate 7. If the maximum and minimum readings at the l

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Attachment 2 Page 1 of 2 AN AMERICAN NATION AL STANDA AD MCC-1211.00-00-0095 TESTING OF NUCLE AR AIR-CLEANING SYSTEMS ANSl/ASME N51o-198o i

furnished, under actual field conditions at maxtmum l And then calculate volumerne flowrate, G, from the and mmimum filter pressure drop, and (2) to verify equation that airflow distribution across each filter or adsorber in each stage is reasonably uniform at the designed p,ap volumetric flowrates.

where A = cross. sectional area where velocity traverse was made.

8.2 Apparatus (See Section 9, ACGlH IndustrialVen- 5. Compare measured volumetnc flowrate with the tilation) value required by project specifications. If necessary,

1. Standard pitot tube adjust system to achieve the specified volume flow rate. If the specified value cannot be achieved, stop

! 2.1:10 inclined manometer test and not@wnerned kntaW fan operadon j over a period of at least 15 minutes.

3. Rotating vane, heated wire, or heated tharmo.

couple anemometer having calibrated accuracy of at 6. After successful completion of par. 8.3.l(3.) or least 3fo of full scale reading. Calibration shall be 8.3.1(4.), increase system resistance artificially by verified before start of test. blanking off portions of the filter bank until a pres.

sure drop of at least 1. 25 times the design dirty filter 8.3 Procedure pressure drop for the system (as specified in the test procedure or project specifications)is achieved. Check j f 8.3.1 Airflow Capacity Test for stable fan operation over a penod of at least 15 s

1. Install all system components. mmutes. If the required dirty. filter system airflow

2. Start system fan. cannot be achieved notify Owner.

7. Repeat par. 8.3.l(6.) using sufficient artificial 3.The preferred procedure is to traverse in accor.

resistance to produce a pressure drop of about 50' of dance with Section 9 of /ndustnal rentilation. The that of Par 8.3.l(5).

traverse should be made at a pomt in the duct where airflow is steady, velocity is 100 fpm or more,and,if 8. Acceptance Cnteria. Flow shall be within t 107.

i possible, where velocity measurement can be made at of system design flow. '

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,, least 7.5 duct diameters downstream of any airflow 8.2.2 Air Distribution Test disturbance. Calculate system volume airflow in ac.

NOTE cordance with Section 9 of ACGIH /ndustrial Ventda-tion. The rests desenbed in the following raragraphsof 8.3.2 shall be performed only as acceptance tests artd after 4.When duct or plenum velocity is below the use. major system modification and rep.ur. The tests are ful range of the pitot tube, one of the other instru. made only dunne acceptance testing to11owing original

'"'M*" " '" d^^#2 "

clezntng system.

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• f th' ^^'

j ments desenbed in Section 9 of ACG!H Industrial Vennlation and listed in paragraph 8.2.3 must be When duct bends are sharp, airflow may separate employed. An alternate procedure is to divide the from the inner wall of the bend to form a dead space

! cross.section into not less than 16 equal areas and to in which air tends to circulate in a large eddy, the measure the velocity in the center of each. In allcases, direction of rotation bems forward near the main.

! enough readings must be made that the greatest dis.

I stream and backward near the wall. Separation may tance between centers does not exceed 12 inches.To also i ccur when the duct diverges too rapidly, or by

- determine total system airflow, calculate average the shedding of free eddies, or vortices, downstream velocity in the housing from the equation f bstacles such as damper blades. This pattem of gas separation and later reattachment downstream p , I"i Vi usually exhibits slow fluctuations which may be n

l where visuahzed as gusts sweeping first through one part of

) the flow cross section and then another. Under these i F = average airflow velocity through the housing; circumstances, measurement of flow is made difficult V, = individual velocity readings: by two factors: (1) the presence of reverse flows n = number of velocity readmgs. caused by large scale eddies in some areas of the cross

\ section and (2) the inconstancy of the velocity profile 1 11 l

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Attachment 2

• Page 2 of 2 MCC-1211.00-00-0096 AN AMERICAN N ATION AL STANDARD TEST!*.3 CF NUCLE AR AIR CLEANING SYSTEMS ANSl/ASME N51o-19Eo when making senal measurements in such cases even

5. Instrument readmg at each test point with iden.

the substantial airflow resistance of filters and ad. tification of location, calculated velocity, and cal.

sorbers may be madequate to redistribute airflow culated average velocity.

across their faces when they are in close proxttmty t

6. Total airtlow through system.

such flow disturbances. Carefully placed flow straight.

entng baffles may be required to meet the flow distri- 7. Airfi w distnbutio . test results.

bution acceptance entenon of paragraph 8.3.2(4). 8. Nonconformances discovered dunng test and

1. Throurh HEPA Filter Baks. For filter banks name of parties to whom reported.

contaming ten or more filters, the mintmum number 9. Instrument calibration data.

of velocity measurements will be one in the center of j k each filter. For systems containing fewer than 10 10. Signature (s) of test personnel.

HEPA filters m a single bank, the minimum number 11. Date of test.

of velocity measurements will be ten and willinclude

12. Distribution of report.

one reading in the center of every filter in the bank.

Velocity measurements are preferably made down.

stream of the filters to take advantage of the flow straightening charactenstics of the HEPA filter.

2. Throurh Adsorber Banks. For banks containing 9. AIR. AEROSOL MIXING UNIFORMITY TEST pleated bed adsorber cells (Type l), the air distribution 9.1 Purpose test will follow the same procedures specitied for This test is prerequisite to the tests of Sections 10 HEPA filter banks in paragraph 1. For banks contain. and 12,in. place leak tests of HEPA filter and adsorber ing adsorber modular trays (Type II) the air distribu. banks, respectively. The purpose of the test is to ver.fy tion test will follow the same procedures specified for that tracer (DOP or refrigerant gas) injection and sam-filter banks in paragraph I except that all velocity ple ports are located so as to provide proper mixingof measurements will be made precisely in the plane of the tracer m the air approachmg the component stage the face of the air channels and in the center of every (HEPA filter bank or adsorber stage) to be tested,or open channel. For single unit adsorbers of the deep the sample plane. The test is made only upon comple.

bed or gasketless design (Type lif), velocity measure. tion of initial system installation, modification, or ments for the air distribution test will be made in the major repair, and is not required each time an in. place centers of equal areas that cover the entire ope face test of the filters or adsorbers is made. A validin place and are not in excess of 12 inches on a s.de. test is not possible without a uniform tracer. air mix.

3. Through Prefilter and Motsture SeparatorBanks. '#'

Whenever air distribution tests are required for these 9.2 Summary of Method air cleaning devices, the test procedures rpecified for HEPA filter banks will be followed. DOP aerosol is introduced into the air stream at a previously selected injection point. Aerosol concentra.

4. Acceptance Criteria. All readings shall be with.

tion readings are taken across a plane parallel to,and in t 20% of the average velocities measured per 8.3.2.

a short distance upstream of the HEPA filter bank; 8.4 Report the uniformity of these readings estabbshes the ac.

ceptability of the injection port location.

A wntten report shall be fumished to all persons specified in the test procedures. The report shall in. WE 1 cgude as a mintmum. . If the system has more than one llEPA filter bank or more than one adsorber stage. a separate tracer injec.

1. Title or identification of test senes. ti n p rt is requtred I r each bank and therefore, a separate air-aerosol mning test is required for each in-

2. Job number or Purchase Order. jecti n p rt and filter bank. If air-aerosoi mains is adequate for the first bank of HEPA filters,it can be

3. Test instruments employed. assumed t be adequate for the first adsorber stage downstream. If the system contatns a second bank of

4. Location and cross sectional dimensions of each IIEPA filters, the DOP rnust be unected at a point be-duct of plenum where tests were made. tween the two llEPA banks in order to introduce suf.

ficient aerosol to the second bank for a vand test.

12

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i t i AUX /L/AR Y BUIL DING EXHAUS T FIL TER UNIT SCA L E %" = l'- 0" i

1 MC C -12I1. 00-00-0096 l A TTACHMENT 3

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Tabulated Results for supplemental VA Airflow Distribution Tests Unit 1 VA Filtered Exhaust

1. Observed syatam flow rate 52,000 can (54,000 cfm 110% required by Tech Spec 4.7.7.b1)

2. Flow Distribution at Prefilter Inlet a) Average velocity: 273 fpe b) Hi5hest: 600 fpm Loweet: 140 fpm c) Deviation: +120.13%, +48.63%

3. Flow Distribution at HEPA Exit a) Average velocity: 407 fys b) Highest 500 fps Lowest: 290 fps c) Deviation: +22.89%,-28.72%

4. Flow Distribution at Carbon Inlet a) Average Velocity: 1124 fyn b) Highest Points 1400 fp5* Lovest Point: 950 fpm c) Point to Point Deviation: +24.56%*, -15.48%

d) Highest Slot: 1265 fpa Iowest Slot: 1020 fpm e) Slot to Slot Deviation: +12.54%,-9.25%

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• Three points taken at an area of increased flow disturbance due to a junction box were 1400, 1350 and 1350 rpm. Discountina these three points, sivesan

! averste of 1120 fps for the remaining 197 measureaants, with a high reading of 1300 fpm which equates to a 16.07% deviation.

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Unit 2 VA Filtered $shaust _

1. Observed syntam flow rate: 43,000 cfm (43,000 cfm 110% required by Tech Spec 4.7.7.b1)

2. Flow Distribution at Prefilter Inlet a)- Average velocity: 289 fpm b) Highest: 550 fps Lowest: 130 fps c) Deviation: +90.12%, -55.04%

3. Flav Distribution at R fA Esit a) Average velocity: 373 fps ,

b) Hfghastr 450 fps Lawest: 280 fpa c) Deviation: +20.78L -24.85%

4. Flow Distributton at Carbon Inlet a) Average Velocity: 918 fpm b) Highest Point: 1100 fpm Lowest Point: 800 fpm c) Pc. int to Poi.nt Deviation: +19.83%, -12.85%

i d) Eighest Slot 985 fpm Lowest' slot 815 fpm .

l e) Slot to Slot Deviation: +7.26L -10.16%

Col 00DfT8: Differing sysrege velocities for prefilter inlet and HEPA ezit are indicattfe of too large a asasurement grid to account for turbulence at the upstream face.

Highest point at Unit 1 carbon inlet was seen in an talet slot naarast the houstag wall, at a point just below a junction bos

mounted on the wall. Once post tha abstruction, this flow 1 should further distribute through the blocked, lower flovrate arsa.

gb .

Philip W. Rabarson Associate Engineer, Performance EcQuite Nuclear Station i

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McGUIRE NUCLEAR STATION Auxiliary Building Ventilation System Engineering Evaluation of Supplemental Filter Testing Unit 1 VA Filtered Exhaust

1) System flow rate: Acceptable Observed value is within 210% of design value.

2) Flow distribution at prefilter inlet: Acceptable Observed values are from +120% to -49% of the average velocity. No criteria areapplicable since the prefilter performs no safety function.

3) Flow distribution at HEPA exit: Acceptable Observed values are from +23% to -29% of the average velocity, and are sufficiently close to the established 220% criteria to be considered acceptable.

Additionally, laboratory testing performed on HEPA filters indicates no reduction in expected performance at this range of velocity.

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4) Flow distribution at carbon inlet: Acceptable Observed values are from +25% to -15% of the average velocity, and are sufficiently close to the established 220% criteria to be considered acceptable.

Only three (3) of two hundred (200) data points fell outside the 20% criteria.

With these three points removed from the data set, the variation of observed velocity is +16% to -15% of the average. These three points (1400, 1350, 1350 fpm) were due to small local disturbances upstream of the carbon bed, and are considered to have negligible effect on actual velocity distribution within the carbon bed itself. No reduction in performance is expected. Additionally, the slot to slot deviation was well within the acceptance criteria.

Unit 2 VA Filtered Exhaust

1) System flow rate: Acceptable Observed value is within 210% of design values.

l 2) Flow distribution at prefilter inlet: Acceptable Observed values are from +90% to -55% of the average velocity. No criteria areapplicable since the prefilter performs no safety function.

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3) Flow distribution at HEPA exit: Acceptable j Observed values are from +21% to -25% of the average velocity, and are sufficiently close to the established 220% criteria to be considered acceptable. Additionally, laboratory testing performed on HEPA filters indicates no reduction in expected performance at this range of velocity.

4) Flow distribution at carbon inlet: Acceptable 1'

Observed values range from +20% to -13%, and are within the established

20% criteria. Additionally, the slot to slot deviation is well within

the acceptance criteria. -

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