ML20198E575
| ML20198E575 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 11/06/1985 |
| From: | Tucker H DUKE POWER CO. |
| To: | Adensam E, Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8511140100 | |
| Download: ML20198E575 (2) | |
Text
{{#Wiki_filter:.. .I DUKE POWER GOMPAhT P.O. BOX 33180 - CHARLOTrE. N.o. 28242 HALB. TUCKER ren_epnown
== rer. (709 amaan NUELEak e ODUCTION November 6, 1985 Mr.- Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attention: Ms. E. G. Adensam, Chief-Licensing Branch No. 4
Subject:
McGuire Nuclear Station Docket Nos. 50-369 and SC 370 Technical Specification Amendment Containment Integrated Leak Rate
Dear Mr. Denton:
Attached is supplemental information regarding the proposal to allow an increased containment integrated leak rate. This information is in response to Ms. E. G. Adensam's request for additional information regarding the subject, dated October 15, 1985. This document supplements the proposed Technical Specifications revisions in our letter dated August 20, 1985. As such, no additional fees are required. Please feel free to contact us if you require any additional information. Very truly yours, n EHal B. Tucker -JBD/hrp Attachment cc: Dr. J. Nelson Grace, Regional Administrator Mr. Dayne Brown, Chief U. S. Nuclear Regulatory Commission Radiation Protection Brar.ch Region II Division of Facility Services 101 Marietta Street, NW, Suite 2900 Department of Human Resources Atlanta, Georgia 30323 P. O. Box 12200 Raleigh, North Carolina 27605 Mr. W. T. Orders NRC Resident Inspector Mr. Darl Hood, Project Manager McGuire Nuclear Station Division of Licensing Office of Nuclear Regulatory g g5 06 Commission 01 0 11 O O ppg Washington, D. C. 20555 h1 P l L.~.
r ATTACHMENT 1. Effective sprayed containment voltme The containment is equipped with two 100 percent capacity return air fan systems, each of which uses a 30,000 cfm fan to force air from the upper compartment back to the lower compartment, and thus provide a homogen-eous mixture of steam and air throughout the containment. Therefore, the effective sprayed containment volume was assumed to be the containment 3 net-free volume of 1.038 x 100 ft, 2. pH of the spray A containment spray pH of at least 8.5 is assured by implementing McGuire Technical Specification 3/4.6.5.1 which requires that the pH of the water solution from ice melting be in the range of 9.0-9.5. 3. Containment sump volume, or alternatively, the volume available for contain-ment spray recirculation The post-LOCA containment sump liquid volume available for containment 3 spray recirculation was assumed to be 85,648 ft. (Value supplied by WaterReactorDivisions, Westinghouse.) 4. Effective spray drop height The distance from the six spray ring headers to the operating deck ranges from 97 ft. to 107 ft. Elemental, organic, and particulate fodine removal coefficients ( A u 5. )l,, and 4) for the containment sprays From SRP 6.5.2 guidance, the maximum elemental iodine decontamination factor, DF, was calculated to be 5.5. Reference NUREG/CR-0009, "Technolog-ical Bases for Models of Spray Washout of Airborr.e Contaminants in Contair-ment Vessels", conservatively assumes a DF of 100 for particulate iodine removal. No credit was taken for spray removal of organic iodines. The elemental iodine removal coefficient, A, was calcualted based on the most conservative boric acid spray elemental iodine removal test presented in NUREG/CR-0009. The most conservative test (i.e., slowest removal rate) results in )L equal to.912 hr.-l. The particulate iodine removal coefficient, )lp, was calculated based on sp) ray cut-off time and a particulate DF equal to 100. The calculated equals 2.47 hr.-l. The organic iodine removal coefficient, /\\,, was assum,ed to be 0. t 6. Brief description of model used in the calculation Discussed adequately in the above responses. t = _ -,}}