ML20214A291

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Forwards Results of Air Aerosol Mixing Uniformity Tests for VC Sys B Train.Encl Data Coupled W/Data Presented w/870416 Ltr Justify Validity of Assuming 90% Efficiency of Recirculation Filters for Control Room Dose Calculations
ML20214A291
Person / Time
Site: Braidwood  Constellation icon.png
Issue date: 05/11/1987
From: Hunsader S
COMMONWEALTH EDISON CO.
To: Murley T
Office of Nuclear Reactor Regulation
References
3067K, NUDOCS 8705190369
Download: ML20214A291 (9)
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.[m\\. ConugMNewealth Edloon a

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) One Fast Nabonal Plaza, CNca00. Illinois 6-.

V Address Reply tz Post Omco Box 767 Chicago, Illinois 60800 0767 t

May 11, 1987-Mr. Thomas E. Murley, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555

Subject:

Braidwood Station Units 1 and 2 Interim Operation of HVAC Systems NRC Docket Nos. 50-456 and 50-457

References:

(a) March 27, 1987 K.A. Ainger letter to !{.R. Denton

.(b) April 16, 1987 S.C. Hunsader letter to T.E. Murley

Dear-Mr. Murley:

Reference (a) provided filter test data for the Braidwood control

room ventilation (VC) recirculation charcoal filters with a justification indicating a 90% filter efficiency is appropriate for control room dose calculations even though ANSI-N509 acceptance criteria had not been met.

Reference (b) provided additional test data for the VC A train and B train recirculation charcoal' filters airflow distribution and mixing uniformity tests.

Included in attachment A are recently performed air aerosol mixing uniformity test results for the VC system B train. The data shows a +24.4%,

-22.1% deviation. This data coupled with that presented in reference (b) justifies the validity of assuming 90% efficiency of the recirculation charcoal filters for control room dose calculations.

Prompt NRC review and acceptance of this information is requested

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so the Braidwood VC system can be declared operable.

Please direct any questions you may have concerning this matter to this office.

I Very truly yours, 87051%h98705{

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. Hunsader POR D

P Nuclear Licensing Administrator cc:

J. Stevens NRC Resident Inspector - Braidwood 3067K QV-

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