ML18139B686
| ML18139B686 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 12/28/1981 |
| From: | Varga S Office of Nuclear Reactor Regulation |
| To: | Leasburg R VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 8201200673 | |
| Download: ML18139B686 (16) | |
Text
{{#Wiki_filter:-~ -- _Jl__l--ScT RIB-~ ON ~e_t.s,... NRC PDR L PDR TERA NSIC DEisenhut OELD Docket Nos. 50-280 and 50-281 <::'.f IE-3 ACRS-10 DNeighbors CParrish Gray File Mr. R.H. Leasburg Vice President - Nuclear Operations Virginia Electric and Power Company Post Office Rox 26666 Richmond, Vir~infa 23261 Qear Mr. Leasburg: "\\..._,_--...i. {\\ / 'vy '-/ --:--I J \\- ~~! 'If flt - ? Us ~'-;J,~:7-9?:,,~ '? ,,.~ .,,,c *-.,1.4 --,.~\\.I ~/i"-'..*;-,1--i-;\\y> ~::._!...---"r We have reviewed your submittal dated October 28, 1980 and other related material_ you have provided concerning the auxiliary building and control room ventilation systems for Surry Power Station, Unit Nos. 1 and 2. We ,Fjnd that we need additional information. As discussed with members of your staff on December 23, 1981. we are enclosing a copy of *your proposed Technical Specifications marked up in the manner \\*Je discussed. Please review these marked up Technical Specifications and provide us a revised submittal. He request that you provide your response within 30 days of receipt of this 1 etter.
Enclosure:
As stated cc w/enclosure: See next page 8201200673 811228 *-.... , PDR ADOCK 05000280 P PDR Sincerely, . inal signed bY :. . orig " :rga
- s. A* va Steven A. Varga~ Chief Operating Reactors Branch #1 Division of licensing NRG FORM 318 (10-80) NRCM 0240 OFFICIAL RECORD COPY USGPO: 1981-335-960
e Mr. R. H. Leasburg Vfrgi ni a Electric and Power Company cc: Mr. Michael W. Maupin Hunton and Williams Post Office Box 1535 Richmond, Virginia 23213 Mr. J. L. Wilson, Manager P. O. Box 315 Surry, Virginia 23883 Swem Li bra ry College of William and Mary Williamsburg, Virginia 23185 Donald J. Burke, Resident Inspector Surry Pav,er Station U. S. Nuclear Regulatory CoQmission Post Office Box 166 Route l Surry, Vi rgi ni ~. 23883 - Mr. J. H. Fergus.on Executive Vice President - Power Virginia Electric and Power Company Post Office Box 26666 Richmond, Virginia 23261 e
TS 3.22-1 3.22 AUXILIARY VENTILATION EXHAUST FILTER TRAINS ApplicabilitX Applies to the abilities of the safety-relat~d system to remove particulate matt~r and gaseous iodine following a LOCA or a refueling accident. Objective To specify requirements to ensure the proper function of the system. Specifications A. During station operation or refueling operations, the following conditions shall be met:
- 1.
System flow rate test in the LOCA mode of operation shall show design flow of 36,000 cfm +/- 10 oerccnt. {HfO';,'.
- 2.
Air distribution test t\\J"t'"*tfo::. fse_ &f the 1prefilte:--bank sh.111 show " ~- I '.f. uniformity of air velocity within +/-.20 percent of average velocity. In-place cold DOP tests on RIPA filters shall show greater than or qq.~ equal ~o ~ percent remov~l. In-place halogen~ted hydrocJrbon leakage tests on charcoal adsorber b~nks shall sho~ &rcate~ thJn or equal to 99 percent r~moval.
- s.
- 6.
TS 3.22-2 '1rJ Laboratory analysis on charcoal samples* shall show at least '9' perc.s,nt (0 methyl iodide removal at\\0.125 sec.+/- -2' percent /.:, residence time,~ to~- mg/~ inlet methyl iodide concentration, relative humidity ~3 fS-greater than or equal to )(f percent, and air temperature greater than i~' C; or equal to ~~.' The pressure drop across filter cells and adsorbers shall not exceed' 7.0 inches W.G.
- B.
With one circuit of the filter system inoperabie for any reason, return the "" '"',H..,~. C,,,...,1,f,,..._,,,,e.. 1-: circuit to operable status within 7 days ~-~i~-i~te reac~c:n: s*hutdownAa.nd 4-f' ~"! immediately terminate fuel handling operations~*-- B2sis The purpose of the filter trains located in the auxiliary building is to provi~e s:2ndby capability for rcm0v~l of oariiculate and iodine coiitaminants from the ex~aust air of the charging pump cubicles of the auxiliary building, fuel buildizig, de_contaminati0n b~ildi:ig, safeg~ards. building adjacent to the contair...ments, and_ the reactor cont.1bi::::>nt (during shutdo*,.;n) which discharge
- hrough the ventilation vent and could require f il t_ering prior to release.
During not";!)3l plant operation, the exhaust from ariy one of these areas.. can be diverted, if required, through the auxiliary building filter trains remate-pt~~ cubicle exhi~st are automaticJlly diverted through the filter trains in the event of a LOCA (diverted on hi~h-h.igh con.tainment pressure). The fuel l *1;* d h ,u1...... :n,5'. cX~.lt!St an pu~ge ex.. rnst.lr~ J.1.1gne*J the filte:::-s during spent f:.H*l h.111dli1~g. to continuously rJss through
,.:~ ' e** TS 3.22-3 High efficiency particulate absolute (HEPA) filters are installed before the charcoal adsorbers to prevent clogging of the iodine adsorbers. The charcoal adsorbers are installed to reduce the potential relea~e of *radioiodine to the envirorunent. The in-place test results should indicate a system l_eak
- tightness of less than 1 percent bypass leaka'ge for the charcoal adsorbers and a HEPA efficiency of at least 99,~ercent removal of DOP -particulates.
'F-ae ~eat reliase free e~eretiag iCC~ e~Hi~~ent li~iti tb~ relative nt::raidity a£ tbe e*Ha1:1st ah to les.! tl3.aa SO per'7eat @v@:a. "a.es Qu.tdear sir is asst!ffled t; ~@ 18& .. 13ereel'l.L rela1.1ve humisHy a:a.d all ECGS leske._gc c.aporates i.ate t.ae e:tftatt!t. eir ~t Jm. The laboratory carbon sample tests are required to indicate a radioactive methyl iodide renioval effidenq;t at leJst ~ percent at a relative humidity greater than or equal to }(lpercent. If the efficiencies of the HEPA filters and charcoa.l adsorbers are as specified, at flow rates, velocities, ar:d rela:i'.0e h~11idities,,hich a __ re less than the design values of the filter banks, the resulting doses Kill be less than 10 CFR 100 guidelines for the accidents analyzed. The offsite dose calculations for et&' LOCA.:rnd fuel handling accidents assume cnly 9Q per:c!'!t e~e ~9ercent, ~ctiv_clj> iodine removal efficiency for the air passing through the '1t,f.C"..... charcoal filters. Therefore, the demonstration *of K~ l"@re~t le3kage d,lf1'tr-A.~fr.1;_ft~ ~ -~ ~7 h 1. i'd 1 -r*. "11 e1:I:CH:Hey a"ffll ~ percent :ilet1 y_ 1ou1 e r:?mova e:.1.1c1ency ~1 assure the required capability of the filters is met or. exceeded. I
e TS 4.20-1
- 4. 20 AUXI LIAR\\" VENTILATION EXlL.\\UST FILTER TRAINS Appl~cability Applies to the testing of s~fety-related air filtration systems.
Objective To verify that leakage efficiency and iodine removal efficiency are within . acceptable limits. ~pecifica tions A. Tests and Freouencv
- 1.
Auxiliary ve:1tilation system exhaust flm,* rat.e through the.filters in determined for the LOCA mode of operation by aligning Unit 1 or Vnit 2 Safeguards room exhaust and the exhaust from three charging pump cubicles through the filters. The method for determining the syste~ air flow rate shall be in accordance with Section 9 of ACGIH rJ r lf.,J5T µ~10-1'11~. Industrial Ventil.1ti0nAU-tl.. S-ec.,rln... r 'J
>: I I e* TS 4.20-2
- 3.
pt<., An air distribution test across the -HelAl\\filter bank shall be performed initially and after any majo*r modification1 l)< major the air cleaning system~-11-fl<<-/.,~f f /lf'W dts/r,b11 l~1
- 4.
The air distribution test shall be performed with an anemometer
- s.
located at the upstream side and at the centet of each ~~ilter cell. In-place cold DOP tests for HEPA filter banks shall be perf~rmed:
- a.
Initially,
- b.
At least once per refueling cycle, i.e., approximately eighteen months.
- c.
Follo~ing ~igsificant painting, fire, or chemical release in any ventilation ::one ccr.~1Junicating 'with t:i.e system, d~ After each co~plete or partial replace~ent of the lffiPA-filter cells, and
- e.
After.:rny structunl ;;i.Jint::!nance on the *filter housing*.
- 6.
The procedure for in-pl~ce cold DOP tests shall be in accordance with -~~SI ~510-1975, ~~cti0n 10.5 or 11.4..
- 7.
In-place halogenated hyJroc3rbon leakage tests for the charco~l adsorber bank shall be perfor~ed:
- a.
Initia!ly.
- b.
At least once per refueling cycle, i.e., approxi~a:ely eighteen I months.
- c.
F.:>11,w~ng si.;nifie.rnt ;i.,ii1ting, fir'!, or c:1e::1ic.:?l re"!.e.J::;e in.Joy \\'~*ntilatiun ;:011e c0mmunic.1ting *.. :ith the sys:em,
TS 4 *.20-3
- d.
After each comp!ete or partial replacement of charcoal adsorber trays, and
- e.
After any structual maintenance on the filter housing."
- 8.
The procedure for in-place halogenated*hydr-0carbon leakage tests shall be in accordance with ANSI-NSl0-1975, Section 12.5.
- 9.
Laboratory analysis on ch.1rcoal samples shall be performed:
- 10.
- a.
Initially, whenever a new batch of charcoal is used to fill adsorbers trays,
- b.
~ At least once., per refueling cycle ~ after i20 hours of system operation, and
- c.
Following ;ig~ifieaR~ paint, fire, or chemical release in anv ventibti.:in zone communicating \\..*ith. the s*,*stem1'~ *t~ l/1J { ; fr v c.. f11 oJ._ fJ/1 a, 1.1 /,e.,., IH'.ICJ- ~ 11..... ~II£ P ~ h ///, o I' _ c.J.__~c,-,..)._ 6..-~~rW /..o11S1Nj'i, The orocedure f~r iodine removal efficiency tests shall follow As-flt\\ 3fo ~,
- CDT St:s:r.e-~d J lo-II.
C~1:1rcoal s.1mples for retest shall be taken £rem the t~st C3nisters.
- 11.
The pressure drop across t~e R~PA filter and adsorber*banks shall be checked:
- a.
Initially,
- b.
At least once pe::- refueling cycle thereafter for systems A,Jt(
- naintained in a $Lir~dt,y st3tus ~ after 720 '!lours of system operation, :10d
- c.
After ~ach complete or ~~rtial replacement of filters or. adsorbers.
- 12.
Each redundant filte~ train circuit shall be operated every month if it has not already been in operation.
- 13.
At least once per refueling cycle, the operability of the entire-safety-related portion of the auxiliary ventilation system shall be demonstrated.* When one circuit of the filter trains system becomes inoperable, the operability of the other train shall be demonstrated immediate-ly and daily thereafter. rf. n.. ~I,~~ "fy-._f,~,- A,,,r-t.. O(Glh",.,1 fl,t lpt,-o.1,/(. fl"()(~ liW,;./-. ~e.. (!J~ro, 1,:,,
- B.
Acceptance Criteria The exhJust 2ir fl~\\, r3te dete"~ined in Specifications 4.20.A.. 1 and ~.~O.A.. 2 shall be ~ithin the li~its ~pecified in Specification 3.22.A.l. The ventilation system shall be adju~ted *until the specified limits are met.
- 2.
The results 6£ air dist~ibu~i0n tests described in Specifications 4.20.A.3 and 4.20.A.4 shall be ~i~hin the specified limits of Specification 3.22.A.. 2. The ventilation*sy~tem shall be adjusted until the specified limits are met.
- 3.
The results of in-place COP test described in Srecifications 4.~0.A.5 and 4.:0.A.6 shall be ~ithin the limit~ of Specification 3.22.A.3. Leakage sources sh~ll be id~ntified, repaired, and retested. Any HE?.-\\ filtt*rs found,i.*frl:'.ti,*~ sh::ill be repbced.
TS 4.20-5
- 4.
The results of in-place halogenated hydrocarbon leak test described in Specifications 4.20.A.7 and 4.20.A.8 shall be.within the.limits of Specification 3.22.A.4. Leakage sources shall be identified,: repaired, and retested.
- 5.
The results of laboratory analysis of charcoal samples described in Specifications 4.20.A.9 and 4.20.A.10 shall f within th~ limits of *. . J_A,l,o(.,r/.t.(f h-Jt I '((flf {) c.J..rut.CH.J.. 4'f s,,e.w, ~ ~I I, I ~VAi,._ -(.. Specification 3.22.A.5. A If test results are unacceptable, all w,~,~ JI ~s,f j~thfh°N\\: adsorbent in the system shall be replaced with new adsorbent.
- 6.
Pressure drop across the HEPA filters and charcoal adsorber banks measured in Specification 4.20.A.11 shall be within the limits of Specification 3.22.A.6. If this condition cannot be met, new filter cells shall be installed. /S-111,µ11k~
- 7.
The miniol.CTI per-iod of air flow through the filters w111 be* 19 ee1:1rs per month.
- 8.
System operability test oi Specification 4.20.A.13 shall demonstrate automatic st.Jrt-up, shutdo*,,n.:rnd flow path ali*gnment.
- 9.
The filter train oper.Jbility test of Sp~cification 4.20.A.14 shall demonstrate proper equipment start-up and shutdo~n and flow path alignment.
-e TS 4.20-6 Basis Ventilation system filter components are not subject to rapid deterioration, having lifetimes of many years, even under continuous flow conditions. The tests outlined above provide assurance of filter reliability and.will ensure timely detection of conditions which could cause filter"degradation. Pressure drop across the combined HEPA filters and charcoal adsorbers of less than 7 inches of water at the system design flow rate_will indicate that the filters and adsorbers are not clogged by excessive amounts of foreign matter. ,s- /lt,Nuk.s Operation of the filtration "::;ystem for a minimtun of ~ ~ a month prevents moisture buildup in the filters and adsorbers. The fr~quency.of tests and s~mple an3lysis of the degr3dable coraponents of the system, i,e~, the h"IPA filter Jnd charcoal adsorbers, is based on actual hours of operation to ensure that they ~erform as evaluated. System flow rates and air di~tribution do not change unless the ventilatioci iystem is radically - altered. GoL'lsew,l'eD_i,y, less frequent tegj:,g b~s bzza Efleeifiea fH tlie sys~em Ha,, I t.. 1-E Bit el 8 !: f iic.. ~ibution. If s-igRifieaat painting, fire, or chemical release occurs such that the HEPA filter or charcoal adsorber could become contaminated from the fumes, chemical, ~~ foreign material, the S3m~ tests 3nd SJmple analyiis are performed as
High efficiency particulate absolute (HEPA) fi te~s are installed before the charcoal ad~orbers to prevent clogg ng of the iodine adsorbers. The charcoal adsorbers are instal d to reduce the potential intake of radioiodine to the contro room. The in-place test results should indicate a system leakti tness of less than 1 percent bypass leakage f~r the charcoal ad orbers and a HEPA efficiency of at least 9~hpercent removal of DOP particulates. The laboratory carbon sample* test results should inqicate a radioactive ~ ,..,~)':,I" methyl iodide removal efficiency of at leastA~ipercent for expected accident conditions. If the efficiencies* of the'HEPA filters and charcoal adsorbers are as specified, at flow rates and velocities within the design-values of the filter banks, the resulting doses will be less than the allowable levels stated in Criterion 19 of the General Design Criteria for Nuclear Power Plants, Appendix A to 10CFR Part 50. The control room dose calculations assume only 90 percent iodine removal efficiency for the air passing~_1t}.f"ough the charcoal filters. Therefore, the demonstration of ~ercent efficiency will assure the required capability of the filters is met or exceeded).. i 1 If the system is found to be inoperable, there is no immediate threat to the controt room and reactor operation or refueling operation may continue for a limited.period of time while repairs are being made. If the system.cannot be repaired within the sp*ecified time, procedures are initiated to establish conditions for which the filter system is not required.
'C,F.D TECHNICAL SPECIFICATION RVEILLANCE R~UIREHENTS RELAY ROOM AIR TREATMENT SYS"'1 4.XX VENTILATION FILTER TESTS Application.. Applies to the testing of safety-related air-filtration syst~s. Objective To verify that leakage efficiency and iodine removal efficiency are within acceptable limits. Specification I. Tests and Frequencies l.a.(1) In-place cold DOP tests for HEPA filter banks shall be performed (1) initially (2) at least once per operating cycle (3) following fl 0 Q tf ut painting, fire, or chemical release ~n any ventilation zone communicating with the system (4) after each complete or partial replacement of the HEPA filter cells and (5) after any structural maintenance on the filter* housing. l.a. (2) The procedure for.in-place cold DOP tests shall be. in accordance with ANSI N510-1975 Section 10.5'or 11.4. The flow rate during this test §hall be at
- 1 r,{,
the value ~sta1,lhfl:ee 'eelow in Section ~.JOE *1'r.d. 3.')(~.
- Yerify th:it the DOP will ~e injected at a point* far enough upstream and detected far enough dow-nstream to discl9se any possible system bypasses.
- 1. b. (1)
In-place lrnlogen:ited hydrocarbon _leakage tests for the charcoal ndsorber bank shall pe performed (1) initially (2) at least on~e per operating cycle-(3) following oei:;nif hant painting, fire, or chemical release in any ventilation zone cmmnunicating with the system (4) ~fter each complete or partial replace-ment of charcoal, ndsorber trays and (5) after any structural maintenance on the filter housing.
- 1. b. (2)
The procedure for in-place halogenated hydrocarbon leakage tests shall be in accordance with ANSI N510-1975 Section 12.5. The flow rate during this test~ ){~,I. r/.., shall be at the value 98t:a1,Hslh!S 'below in Section * ..i. 'ii,. )'X ~lac!. Verify tl1at the Freon will be injected at a point far enough upstream and detected far enough downstre3111 to disclose any possible system bypasses. l.c. (1) L'lboratory.'lnalysis on charcoal samples shall be performed (1) initially whenever a new batch of charcoal is used to fill adsorbcr trays (2) at least once per
- operating cycle and (3) following M~Rifi@.sl'tt painting, fire, or chc..*mical release in any ventilation zone c1..,11ununicatil1g with the system (4)' after 720 hours of
..._ (* ~ circu.it '-'Pt?rat ion. Ltt/-bdll4 /.,c_'{ klrLt~ IS ~~ II k Vh't,-e . (Jli/{i",., di d.V-1s *If S~lt\\fl,l'lo*
e.,2) ~ ~
- r.
- . ~f~_-.:~~
. ~~~*.*.'" *'.
- } {,tl41P,~\\ fA-tJI,~,.,./.,rt..,.,*..d.(1)
~,e,1.-'l rtl-u~~-/11-Ut ~ l',,,,.!KvPt<,./1:2 i,,,/L..II,_ Sf* fc, The procedure-shall f ollo'W sTm~fo3. or iodin~emoval efficiency tests The charcoal ndsorber efficiency test procedures should allow for the removal.of one.adsorber tray, emptying of. one bed _from the tray, mixi~g the adsorbent thoroughly and obtaining at least two samples~ Each sample should be at least 2 in. in diameter and a length equal to the thickness of the bed. Air flow rate test shall be determined (1) initially and~-- after any major modification or repair of S,he-air cleaning system,4
- 4) 11/-k., 1t1Jt *, l-,..t *.,. UY>,.'f,t'
- a. c2>
r-tff~l'i..Jl. #11 t' s 6r e/,,1}11!.u-J!! 1..<l.s.u-b1 ~d. with* Section 9 of the AGGIN Industrial Ventilation h ti, J.. document~_The filter ce~s dudng tb;ls tP~ shall The procedjre ~P.i. determining the air flow rate of Section ~~.I.l.d.(l) shall be in accordance c..5) {,-{/rui '1Aµf S f4 flff,f _be clean.(.@1 ~*~ f i AN SI /J~la-tfjj. Mt,wkAJ u..,01,J.J._ ~i.sorb-tv' ~ f1 J h,, It cJ..,tr(.C> --2.a The pressure drop across the combined HEPA filter and D '1~, adsorber banks shall be checked (1) initially~ (2) ....-hOIJ\\1 at least once per operating cycle thereafter and* II. I I I i 2.b Acceptance Criteria 1.a (3) after each complete or partial replacement of filters or adsorbers. Each red_unpant filter train.sball b~ _operated every month. Ft. l +t¥ #o.. i°aJ ~ ~ I &<. ~ ~ ~,~.:fU..., -It..' 0 "f fl-u ii.t1+id*-~ ti f ltrvJ ~a;.... ~ Chi..l-ro l * ~ The results of in-place DOP test described in Section 4.XX. I.La shall be within the "limits of Specification 3.X.X.l.a. Leakage sources shall be identified, repaired, and retested. HEPA filters found defective shall be replaced with filters qualified pursuant to Regulatory Position C.3.d of Regulatory Guide 1.52. l.b The results of in-place halogenated hydrocarbon leak test described in Section 4.XX.I.l.b shall be 1.c. l.d within the. limits of Specification 3.XX.1. b. Leakage sources sh3ll be identified, repaired, and retested. The results of laboratory analysis of charcoal samples described in Section 4.XX. I.1..c shall be within the limits of Specification 3.XX.l.c. If test results are unacceptable, all adsorbent in the system shall be replaced with,j}'i,,.adsorbent qualified according to Table 5.1 of~ N509-1976. The replacement tray for the adsorber tray removed for the test should meet the same adsorbent quality. The ail* flow rate determined as described in Section 4.XX.I.l.d shall be within the limits specified in Section 3.XX.l.d. -The ventilation system shall be adj ustco until. the specified linit is met. A
- --~ -,-----
- ~*.
~~SEO 'fl*:cn~rcAL SPECIFICATION *. ~~ING CONDITIONS OF OPERA'flON CON'fROL _Arm REI..AY ROOMS AIR TREATI1ENT SYSTEi1FILTER TRAINS ,,~ ~ . ~\\ \\,** \\\\ ~ \\... \\".',, "' \\ l.*, \\> 3.XX VENTILATION FILTER TESTS . ~\\t\\ -: ~; :, *\\~ .\\ \\*'.,. \\. ~-:..,..... "' *...... y,*... -*,. **.,* .t,....... Applicability \\*;*' Applies to safety-related filtration systems' abilities to remove p~rticulate matter and gaseous iodine. Objective To specify requirements to ensure the proper function of the safety-related filtration system. S_pecif-ication
- 1. a. In-place cold DOP tests at design flows on HEPA filters shall show> ~percent DOP removal.
- 'l't*~ . b. In-place halogenated hydrocarbon leakage tests at design flows on charcoal adsorber banks shall show> 99 percent halogenated hydrocarbon removal. 'IV Laboratory a~alysis on charcoal samples shall show,a._. percentcdio~ctive methyl iodide removal, a-I; a uehei'=" ~ !J C
- l.5"-),0 ritlz§n ~
pczccut sf eet:ual system 1hsi.fij14~.6$ to 8.1S bl' mg/m inlet*methyl iodide concentration, > 95 percent I/I R.H. and ~ i::s ~. fo '-.
- d.
Fans shall be shown to operate,.ithin 11e percent af A.-t A... minimwiil design flow of~ cfmS: lo~, -
- .e. \\.~u-4,xx,a....-..).
/6*0
- 2.
From and after the d'ate that one circuit of the filter system
- 3.
Basis is made or found to be inoperable for any reason, reactor operation or fuel handling is, permissible only during the suceeding seven days unless such circuit is sooner made operable~ If these conditions cannot be met, reactor shutdown shall be initiated and the reactor shall be in cold shutdown within ~ 4 'i hr and fuel handling operations shall be terminated immediately. _ -The control room and relay room air treatme~t system is designed to filter the intake air to the control room pressure envelope which consists of the control room, relay rooms and emergency switchgear rooms during a LOCA. The isolation and pressurization with bottled air of the areas within the pressure envelope are covered in Technical Sp~cification 3.19. When the supply of compressed bottled air is depleted, the control room and relay room air treatment system is manually started to continue to maintain the control ~oom pressure at the.design positive pressure so that all leakage is outleak3ge.
/ III.' Basis ( - 2.a
- .}t...,.. I u TS 4.XX-3 C
-_..l.-------i ~---~--- Pres~ure.drop across the combined HEPA filters and charcoal adsorber banks shall be less than ;5:...:i~n:.,.......,_ water at* the filter bank design flow rate. If ~!.)('IC,/, n cannot be met, new ilter ce s shall be installe4~ 2.b The minimum period of air flow through filters is* ~ per month.* I'S" 11'\\1~k~ Ventilation system filter components are not subject to rapid* deterioration, having lifetimes of many years. The tests outlined above provide assurance of filter reliability and will ensure timely detection of conditions which could cause filter degradation. Pressure drop across the combined HEPA filters and charcoal adsorbers of *less than 5 in.* of water at the system design flow rate will indicate that the filters and adsorbers are not clogged
- by excessive amounts of foreign matter. Operation of the filtration system for a minimum of 1~ a rnont.h prevents moisture b~ildup in the filters and adsorbers! ""-~
The freq.uency of tests and sample ane.lysis are necessary to show that the HEPA filters aDd charcoal adsorbers, can perform as
- evalu.ated*.
System fl.iv r;;tQB ae Hela £la2i;;i9Q wHle21.! f!}Hil ll@ftti:lstion syctenz.is.raBie:all:, 6ltet eel. Consequently, less fr egae11t tts t'i...flg h-a.c Bein speeifie-8 fet. 5J stca: Ela<< rate. If sig~ifi~e~t painting, fire, or chemical release occurs such that the HEPA filter or charcoal adsorber could become contaminated from f~~es, chemicals or foreign material, the same tests and sample analysis are performed as required for operational use. ~ determination af "sig;u.£ii.ca;gt." iis fllaae ey the-'3~e1Pet-01 Ott dat5 at t:1te tiffle ef=-t::M,.,,J,A~t,. li'uQl;.l.QdgiilaBJ.e s-t-ei.f. mcl!'.&e!! s H8u....,M ~n s1,1lt @e p1.ri er "t~~-ki11 0 tili+/-sa..dct~t,-li!i.iiat.aOB.. ., /'* (. \\. (' \\,*' \\ ,, *, \\.. \\ .* '. \\.. *.. *.. ~... \\,~ '. *.......... \\ ~ ',1,'..*:. *. t..
- .* *":!' **}}