ML20214J415

Leakage Reduction Program Summary Rept for Standby Gas Filter Sys (T46-00)

ML20214J415
Person / Time
Site:	Fermi
Issue date:	03/12/1987
From:	Lenart D, Shiffel B DETROIT EDISON CO.
To:
Shared Package
ML20214J375	List: ML20214J381 ML20214J399 ML20214J415 NRC-87-0006, Forwards Three Leakage Reduction Program Summary Repts for Hpci,Rcic & Standby Gas Filter Sys.Addl Repts Will Be Submitted Upon Completion
References
T4600-87-01, T4600-87-1, NUDOCS 8705280042
Download: ML20214J415 (3)

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i IEAIGGE REDUCTIGi PIOGRAM SUW9LRY REEGE i

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SINEEY GhS FILTER SYSTEM (T86-90)-

l DETROIT EDISON CQ1PNE FERII-2 POEER PIRE REPORT 10. T4600-87-01 Prepared Dy: Date: 3-9-87 N SI r rac Supervisor Approved By: h Date: f' a~ /

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8705280042 870522.. l PDR ADOCK 05000341 P PDR, _ j l

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LERKAGE REDUCTION PROGIBM REPORP FOR STMDBY CAS FILTER SYSTEM (T46-00)

INTRCDUCTION: Both the Fermi 2 Technical Specifications, paragraph 6.8.4.a.2, and the Fermi 2 UFShR, Section 5.2.7, require that leakage from systems outside primary containment that could or would contain highly radioactive fluids, be reduced and maintained to as-low-as-practical levels. To demonstrate the leak tight integrity of the Standby Gas Filter System, in-place leakage test are conducted every 18 months and lab test on carbon each 18 months or after 720 hours0.00833 days <br />0.2 hours <br />0.00119 weeks <br />2.7396e-4 months <br /> of use. This report is for jthe initial leakage tests.

REFEREN'ES: 1) Dwg No. EM721-5737, " Standby Gas Treatment System."

2) Plant Operations Manual' 43.404.01, " Standby Gas Treatment Filter Performance Test" (A copy of this procedure is on file at the plant.)

TEST BOUtOARY: All conponents of the Standby Gas System within the secondary containment are under negative pressure with respect to the containment. The system is therefore not a source of radioactive leakage from the containnent. Bypass leakage around filter train ccaponents or loss of filter train efficiency, however, could cause major radioactive release through the vent stack. Therefore, only the filter train section of Standby Gas are tested.

TEST DESCRIPTION: Each division of Standby Gas is subject to three separate types of tests. First each HEPA filter bank, both up stream and down stream, is in-place leak tested to verify that the filters have not been dcmaged during installation, that the filters have been installed properly, there are no leaks in the mounting frame and housing, and that the system contains no bypassing which would compromise the function of the filters. Bypass leakage nust be less than 0.05%. Second, the charcoal adsorbers are in-place leak tested to ensure that bypass leakage is less than 0.054. . The third test involves laboratory testing on a representative sample of the activated charcoal to verify that methyl iodide penetration for a six inch bed is less than 0.167%.

TESP RESULTS: The first in place leak test was conducted on both Division I and II on January 1,1985 with the follcwing test results.

Test Results Acceptance Criteria Division I ,(Percent Penetration) (Percent Penetration)

Upstream HEPA Bank : 0.026 0.05 Charcoal Bank 0.008 0.05 Downstream HEPA Bank 0.016 0.05 Methyl Iodide Lab Test <0.001 0.175

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Division I Upstream HEPA Bank 0.010 0.05 Charcoal Bank 0.000 0.05 Downstream HEPA Bank 0.022 0.05 Methyl Iodide Lab Test <0.001 0.175 A second Set of Tests were run on May 31, 1986 for Division I and on June _27, 1986 for Division II with the following test results.

Test Results Acct.ptance Criteria Division I (Percent Penetration) (Percent Penetration)

Upstream HEPA Bank 0.036 -0.05 Charcoal Bank 0.000 0.05 Downstream HEPA Bank 0.015 0.05 Methyl Iodide Lab Test <0.001 0.175 Division II Upstream HEPA Bank 0.020 0.05 Charcoal Bank 0.000 0.05 Downstream HEPA Bank 0.018 0.05 Methyl Iodide Lab Test <0.001 0.175 ,

TEST RESULTS SLMIARY: h st results were all well within the acceptable range and no corrective maintenance was required.

ACCEPDKE CRITERIA: The bypass leakage criteria for the Standby Gas Filter.

trains is set forth in Technical Specifications under Section 4.6.5.3.b and c. The limit is 0.05% penetration for the HEPA banks and charcoal banks and 0.175%

penetration for Methyl Iodide penetration. Bypass

' leakage above those limits will require corrective maintenance and retest.