ML19312C961
| ML19312C961 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 02/25/1974 |
| From: | US ATOMIC ENERGY COMMISSION (AEC) |
| To: | |
| Shared Package | |
| ML19312C956 | List: |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8001170585 | |
| Download: ML19312C961 (2) | |
Text
911,
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"HEB AEC REGULATORY STAFF POSITION PAPER
_CHARCCAL FILTER INSTALLATION AND TESTING" It is the Staff's gener'ic position that charcoal-filter installations with bypass flow arrangements are unacceptable since moisture entralnment on the absorber material will cause blockage and result in preferential flow through the bypass.
The reduced flow through the absorber could be below that required to meet mininum safety standards. The Staff,' therefote, will require, starting with the Indian Point Unit No. 2 facility, that th bypass be climinated from the filter design and replaced with additional l
charcoal trays.
lf Details of Required Charcoal Filter Tercs
"(The tests presented below refer to in-containment filter systems, standby gas treatment systems, fuel-handling building systems and control room systems as noted for each test.
Where no note appears, that section is equally applicable to all of the above.)
Item 1 Adsorber Efficiency Test Remove one charcoal tray from the system and install a a.
replacement.
a b.
Empty adsorbent from one bed of the removed tray - mix adsorbent thoroughly,
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T' ke from the mixed adsorbent not less than two samples.
c.
a Each sample will be two inches or greater in diameter
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and of a length equal to the thickness of the adsorber bed from which the adsorber was emptied.
d.
Sampics will be tested for retention of methyl iodide.
Testing will be performed at 95% relative humidity and 2500F with inlet methyl iodide concentration of at le'st 3
a 10 mg/m and a f ace velocity of 40 f t/ min. (for SGTS 70% relative humidity and 190 F,1 mg/m 40 ft/ min; for 3
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Fuel-Handling Filters 95% relative humidity,130 F, 0.1 mg/m3 and 40 f t/ min; for Control Room Filters 95%
relative humidity and 130 F, 0.1 mg/m3 and 40 f t/ min.).
,If test results indicate methyl iodide retention of less e.
than 85% (for SGTS 95%; lor Fuel-Handling Filters 90%;
for Control Room Filters 90%), all adsorbent in the 4
system shall be replaced with an adsorbent qualified to Table I of Regulatory Guide 1.52.
Item 2
, Uniformity of Air, Flow Test Each HEPA and Adsorber, will be tested with a pitot tube traverse.or the equivalent to demonstrate that air distribution is uniform within 20%.
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ep, Item 3 Air Deficiency Test Flow must be demonstrated within 10% of the specified flow.
Item 4 HEPA Penetration Test This test must be' performed using DOP in accordance with ANSI N101.1 with a minimum retention of 99%.
This' test must be performed on the filter unit "as is" prior to repairs to holes, etc.
If the filter unit does not_m._
meet the acceptance criteria, it must be replaced and the entire system retested.
Item 5 Adsorber Penetration Test This test must be performed with Freon in acco dance with the Regulatory Position C.S.c of Regulatory Guide -
1.52.
The acceptance criterion is no more than 1%
Frcon penetration.
Item 6 Total System Bypass Test This test is to be performed by introducing DOP at tne inlet.
The exhaust is to be measured with an acrosol photometer in accordance with ANSI H101.1 with an.
acceptance criterion of no more than 1% of the inlet c.oncentration.
Item 7 Each redundant unit of the system will be operated V ' '---
individually for a period of not less than 10 hours1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> per month.
Item 8 At least quarterly, inspections will be conducted of loop seal drains to determine water level.
Item 9 Test Frequency a.
Repeat annually Tests 1, 2, 3, 4 and 5.
b.
Repeat tests as appropriate after repairs, replacements, or painting or other chemical release, etc. in Venti-4 lation zones.
c.
Repeat Tests 1, 4 and 5 whenever a unit of the system has accumulated 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of operation since the latest date of any of these three tests.
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