ML20214X236

TMI-2 Canister Filter Element Evaluation (Revised Filter Media)

ML20214X236
Person / Time
Site:	Crane
Issue date:	06/03/1987
From:	Childress P, Mcguinn E, Ross H BABCOCK & WILCOX CO.
To:
Shared Package
ML20214X226	List: ML20214X223 ML20214X236
References
4410-87-L-0092, 4410-87-L-92, 77-1168130, 77-1168130-00, NUDOCS 8706160390
Download: ML20214X236 (18)

Text

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'IMI-2 CANISTER FILTER EIDETf EVAUATION (REVISED FILTER MEDIA)

B&W DOCUMENT No. 77-1168130-00 Published: June 3, 1987 l-a J

Prepared for GIU Nuclear Corporation

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RaWk & Wilcx:oc Ocmpany Nuclear Ibwer Division P.O. Box 10935 Lynchburg, Virginia 24506-0935 1

8706160390 870610

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SUMARY/OCNCWSIWS.................................................

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BACFER00ND..........................................................

2 3.

EVAURTION..........................................................

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SUIMUWOONCIUSIONS B&W has evaluated the WMcy of GRJN's new canister filter module' with m

regards to the existirq criticality and stnactural analysis ~ nw in licensirg.

'Ihe results of bench tests indicate that the axial and lateral load carryiry capability of the new =*ile eWa that of the. previous w*il e.

Also, the deformations under load are less.

'Ihe margins of safety under accident condition shirptrq loads are 423% for a 100g lateral load and 72% for a 40g axial load.

Raaai on these results,. the new wvble design will have no adverse inpact on existing analyses.

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BACIGROUND GRE has-revised the performance specification of their canister filter c

mariin from.1 micrun ncuinal to 16 micron nominal in an effort to

' inprove the canister's total flow capacity.

'1 heir vendor, Pall Trinity Corporation, has' hhanged the details of element cu=L.oction to allow r-the revised performance levels to be met.

'Ihe original filter element was ~ an ispvsLint structural contributor in determining the accident gec==t.cy of the canister internals for criticality evaluation; bench tests showing the element's structural performance were a crucial part (2 -

'of the. evidence leading to NRC licensing.

It is inportant to ensure that the use of the new element does not invalidate the conclusions of existing canister criticality and structural analyses.

Bench tests run on the previous production filter merhiles indicated that an axial ' force of 3450 pounds was nasviari to initiate buckling.

'Ihe 1[ total axial deflection at that load was 0.045 inches and the' plastic'

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i set,. after the load was removed, was 0.020 inches.

'Ihe module tested

.i was not mounted on the center core tube which would have increased its rigidity. - 'Ihe lateral crush test performed en two modules mus==ssed against each other with their =:r --ge offset yielded a load of 2290 pounds and a total overlap of nearly 0.5 indl.

At that point, the center tube, were it in place, would have started picking up the load

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and incraaeri the crush resistance.

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EVAIDATION Bench tests were performed on the four canister filter modules supplied by GHJN. Test tests were carried out at the B&W Ccumercial Nuclear Fuel m

Plant usirg the same aq*im='1t and method of testirg as in previous int *ile tests by B&W.

. No tests were performed.

In the first test, the module was placed avially in a Baldwin machine and in u-d.al ocapression loads were applied until buckling =aanai to initiate.

'Ibe test was then terminated.

Deflection maasta===aats taputted in Tables 1 and 2 were 41 hided at each load step. 'No wvhiles were tested in this manner. In y;

the seccni test, two wvh les were positicoed laterally against each other with their er*apa in-line.

'Ibe =*iles were then inmaueuitally ocapressed up to a load of 1500 pounds.

Deflection measurements s ?

anputted in Table 3 were recorded at each load step.

'Ihe m*iles were t

then ~gcffset the width of an wid.op and again ira.4.==aitally wwww vi against each other until the deflection harwna non-linear. 'Ihe test was o,

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then taminated.

Deflection inaanurements reported in Table 4 were recorded at eadi load step.

Pictures were taken of the modules. Figures 1-7 show the modules before

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and after tests.

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'Ibe new modules proved to be superior to the original module both in load carrying capability and in overall deformation under load.

In the axial test on two modules, loads of 4300 and 4040 pounds resulted in deflecticris of.0.045 and 0.0485 inches, raanvtively.

Both modules had a permanent set of 0.023 inches.

'Ihese values ocxupare to 3450 pounds, 0.045 inches, and 0.020 inches, respectively, as reported for the original nuvhile.

In the lateral test with the endcap in-line, the deflection was 0.0185 inches for the 1500 pourri applied load and the pamanent set was 0.014 inches.

'Ihe endcap in-line test was not performed on the original =vhile.

In the lateral test with endcaps

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offset, the mavi== load and deflection was 2800 pounds and 0.117 inches.

'Ibese values ocmpare to 2290 pounds and 0.405 inches reported for the original =vhile.

'Ihe figure on page 15 shows three pleats of

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the filter media under the endcap to be crushed.

'Ihis was the only 4

+=ar= to the mvhile.

'Ihe recorded load / deflections for the axial and lateral tests are given in the tables en pages 5-11.

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'Ihe test results yield large margins of safety for the accident

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cxandition shipping loads.

Ra==1 on a payload of 1000 pounds at a l,,

lateral load of 100g's beirg evenly distributed on the 187 modules (17 l

elements,11 modules / element), the load per wvhile is 535 potnis and the

-. t margin of safety is 423%.

With the 1000 payload and a 40g axial load evenly distributed to 17 elements, the load per module of 2353 pounds would result in a margin of safety of 72%.

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