ML19312C964
| ML19312C964 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 06/26/1975 |
| From: | Fish J AMERICAN NATIONAL STANDARDS INSTITUTE |
| To: | Arnold R METROPOLITAN EDISON CO. |
| Shared Package | |
| ML19312C956 | List: |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8001170591 | |
| Download: ML19312C964 (4) | |
Text
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ANSI N 4 8 C0MMIT TEE COR g M D Edi E
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Standard N-510, Testing of Nuclear Air-Cleanin yt 6 609 ---> see me, !
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Address writer cv of; J f i:>,d -
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American Air Filter Compan',
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A Icor_ st impocr P. O. Box 1100
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Louisville, Kentucky N b g },l-m.), ye.r Scr SirmGtd Y
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i t, umhandod M b June 26, 1975 h \\pe d q <6r,w w mc_ rne n. - m e e 4 f-M Colos. l.O. 2c-Hu Wiud tl Sugicsr M ou q e v:-@ C m
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Metropolitan Edison Company
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S P. O. Box 542 g g 73,,,,, j,._ % w y Reading, Penasylvania 19603 W utd n t.r-.
p S-M I Attention:
Mr. R. C. Arnold Vice President
Subject:
Carbon Filter, Periodic Perfonrance Test Requirements
Dear Mr. Arnold:
Guideline 1.52 calls for carbon test canisters to be installed on safety systems containing adsorbers for periodic reconfirmation tests of carben performance ability.
Forthcoming st:ndard, ANSI-N510, refers to such canisters.
Early systens do r.ct hcVe this prcvisica.
The question then arises as to hcw to acconplish this reconfirnation retest on such systems not canister equipped.
A m2eting between, representatives of ANSI M45-0.3 and NRC personnel was held in Bethesda in February, 1975.
Attached copy of minutes covers test procedure agreed upon at that time for adsorber systens not canister equipped.
Standard N510 vill not cover this pcrticular problec. as it is judged to be one uhich will disappear as existing syst. ens are toutinely fitted wit't test canisters when carbon is replaced.
This ccpy of the minutes is scnt to you for your file and use.
Picase refer it to appropriate mcmbers of your organization.
If you have additional questions, please contact sie accordingly.
I will be happy to attempt to answer them.
Sincerely yours,
- r.
l '..
James P. Ffsh Chairman - ANSI N45.8 JFP:jk1
.ttachrant 8001170 77/
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CC: f *t. Fred D. 1.cckie
.CC:
Dr. P.on R. Lelin:r.y Chatruan, N55-6.3 Division of Technf cal inwicw c/o Nuclear ContcAn:wmt Syatew., Inc.
N 2cicar !(egulatory Co r.i'.sica I. O. Hoa 19627 Washingroa, D.C.
h C O M M I T T E E C 0 R R E S P O N D E N C
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COMMITTEE:
ANSI N 45-8 Executive Address Writer Carc Of:
A=erican Air Filter Co., Inc.
P. O. Box 1100 Louisville, Kentucky 40401
SUBJECT:
Application of ANSI N510 to Field DATE:, April 28, 1975 Testing of Existing Adsorber Systems in Nuclear Power Reactors.
The N 45-8 Executive Committee
- met with Dr. R. R. Bellamy of the Nuclear Regulatory Commicsion (NRC) on February 25-26, 1975, to establish acceptable basis for the application of proposed American National Standard N510, Testing of Nuclear Air Cleaning Systems, for testing of adsorber systems in existing power plants. Neither regulations nor the Model Technical Speci-fications provide suf ficient guidance to the user for meeting their requirements for surveillance-test sampling and laboratory testing of adsorbents, and
. considerable confusion surrounds attempts by users to apply the sampling requirement of the proposed standard.
The problem exists in current-generatica systems whic.h _do noe h9ve sufffefent o y -capacity o,r space to install the special canister ar.qyisions for ypling shown in proposed standard N509, Nuclear Power Plant Air Cleaning Units and Components, and which were built or approved prior to issuance of Regulatory Gui,de 1.52.
The following acceptabic sampling techniques were established:
'l. Tray Systems Empty one cell, homogenize the carbon removed, and take a a.
representative sample of apprcximately one to tuo pints.
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Refill the cell with the carbon removed plus additional material as required meeting the requirements of Regulatory Guide 1.52.
Vibrate cell while filling to obtain good packing density of carbon in the cell, and blow off fines, after filling, with co: pressed air. Leak test __
either the complete stage or the arca of the~ replaced cell in accordance with R.G. 1.52.
above, refill b.
Empty cell nnd enko sannie as describnA in n-cell ~ with, or replace cell with a new cell filled with, carbon meeting the requirements of R.G. 1.52.
L_eak_ test _
4 cither, the complete stage or the ayea of the refilled ce_[Lu_
]
c.
For segmented cell.
At least one adsorber manufacturer provides a tray design having 8 separate,- full-length, full depth compartments.
Empty one' compartment, take sample, 1
refill, cnd test as described in a., above.
- ANS1 N45-8 is responsibic for <ieveloping American National Standards for i
Rmanraiu& srns rmgirements for nuclear sower (plant ' air cleaning, systems, n
a..
4 ANSI N 45-8 Executive April 28, 1975,'page 2 4
"If sufficient _ excess airflow capacity exists in the system d.
to maintain nominal design airflow (333 cfo) through the
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system adsorbers during future operation, it_ cay be desirable _
to install _a gpgnialJaap.le_ ttay_(Fig,.,,2j509)_or "p_ipe",
11 i
to mget future san 2 _ng_ne,c_S s,.
samplers (Fi g,1Q09)
Sample trays and inlets to " pipe" samplers shall be designed and tested to demonstrate that resistance relationships at system design flow will produce the design airflow velocity through the sample beds (within limits) as required by N509.
2.
Casketicas and Deep Bed Adsorbers Full-Depth Thief Samples. The thief shall be designed to a.
take a sample equivalent to the full depth (in direction j
af air flow) of the bed, and shall penetrate at least half-way into the bed.
Replace sample with carbon meeting requirements of R.G. 1.52.
Multiple Thief Samples. Use thief similar to conventional b.
grain thief (see RDT standard M 16-1), take at least 3 I
sampics across depth of bed, one at front, one mid way, and one at downstream face.
Replace sacples with carbon meeting requirements of R.G. 1.52.
(It cay _be diffievit_
tpo,.obtain good _ thief. samples because_olthe_high resistance
(
to penetration of the bed by the thief.)
Add samplers such as described in 1-d, above of same depth c.
as the operating bed with airflow within limits as required by N509.
In all of the methods described, consideration must be given to the nominal velocity profile in the system in selecting points (a_cro_ss the face of the slage),to be sampled.
Velocity profile should be within limits established in ANSI N510.
For :nultiple series-stage systems, each stage shall be sampled and submitted for test individually or, if a sampic from the first stage fails the radio-
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the carbon in all stages may Fe' reilacid without~fu~r'ther
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- iodine test, testing, at the option of the system Owner.
The carbon in each ESF system, and in each multiple parallel-stage (i.e.
redundant) system shall be sampled and tested individually, even though all contcIn che same grade of carbon and though nonradioiodine screening tests activity or similar test) indicate no abnormalities.
(such as the CCl4 be more economical _to In e. mall.(c_.g._ 6_0_02,cfm and under) systems, it may replace the carbon in the entire bank _ periodically than to submit the system for raifEiMine tchtI'i'n such cases, the system shall be refilled with
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carbon meeting the requirements of R.G. 1.52 and so documented.
The NRC "Model Technical Specification" requires that a satisfactory labora' tory rad'io methy{ iodide test result for ESF systems, be received A radiciodine test may take b,c, fore _ returning a t_estchystem_to, service.If_the syst g s y dundant several weeks to run and rcceive renults.
(i.e., multipic-parallel units of the same capacity), service may be switched to a redundant unit durin6 this period and the plant need not
.[".ANSJN45-8 Executive April 28, 1975 '
page 3 the plant cannot _be restarted until the _ system Jf;the system is no_t_tedundant,This suggests an area of economic trade-off between is returned to__serXi,ce, arbitrary, replacement of all carbon in the system with carbon of documented (per 1.52) shutdown the required test schedule, without testing, ys., plant performance at Another alternative would be for the time required to obtain test results.
to take sampfeT ieveYil weeks'pTi E to lh'$ scheduled in-place leak test so
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that laboratory-test results may be availabic at the time of the in-place
,If satisfactory test results have been obtained, this would permit test.
resumption of system use with a minimum of downtime.
until better life-data are obtained, the NRC "Model Tech.
For the present, spec." recommends that samples for radioiodine testing of ESF carbon be taken at the end of each,720 Eours'of time on-stream; that is, after each 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> during which a'r is~Ectually drawn through the system.
For continu_
i ously_on: stream _ systems this appears to be a severe penalty, but is the cost
-~ 5a2 ty.
I'C~aftdr a per127f oTnotJaving_pr.odi~dids[ffiEi~eht redu'n'da~nt c serdce_Ecedata indicate that such f7eTueKtesting is not warranted. I;RC This will be on a plant-by-plant may increase the2er,iod_between,_ tests _._
Vasis and will deynd on the test history in thETnT6iifull system anLplant m
The testing discussed above applies only to ESF (Engine ered Ssfety Feature) systems at this time.
By definition, an ESF system is one which is ren,uired to nitigate the consequences of the design basis accident (DBA) of the plant as a whole (e.g., containmcut post-accident cleanup system) or of the facility The ESF served by the system (e.g. auxilliary building ventilation system),
In at least future plants, noa-system cust be operable af ter an incident.
ESF systems will be required to be inoperative during and af ter the incident.
Because of the multiplicty of names of systems, with systems performing essentially the same function in differeur plants, it is impractical to in the ESF categcry.
tabulate those systems which are, and those which are not, The SAR should identffy the ESF systems.
A final point discussed at the necting was the confusion between in-place leak tes'ts (e.g., the Freon test of adsorber systems and the field DOP test of HEPA filter systems) and performtnce or '" efficiency" tests (e.g.,
laboratory tests of carbon samples uithdrawn from a system, and " hot" DOP tests, by the manufacturer or Quality Ar surance Station, of individual
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HEPA filters).
All currently approved 'ield tests are leak tests only, and do not give a ' direct measure of ef ficie tcy of the system tasted.
Test results should be reported as penetrati >n, not efficiency.
These ninutes are made available to anyone in the nucicar industry concerned-7 with the testing of radioiodine adsorption systems.
r the N 45-8 Committee i
I s.
MY M(
ames F. Fish Chairman l
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