ML20212G670
| ML20212G670 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 01/13/1987 |
| From: | Ainger K COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 2584K, NUDOCS 8701210119 | |
| Download: ML20212G670 (4) | |
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One First Nabonsi Plaza. Chcago, Illinois Address Reply to: Post Omco Box 767 N
Chca00, Illinois 60000 - 0767 January 13, 1987 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Byron Station Unit 2 Initial Test Program Results containment Ventilation System NRC Docket No. 50-455 Reference (a): November 3. 1986 letter from K. A. Ainger to H. R. Denton
Dear Mr. Denton:
Reference (a) transmitted a request for schedular relief for a few items contained in the Byron Unit 2 Initial Test Program. One of the items which was deferred in reference (a) involved a reevaluation of some test results for the containment ventilation system (VP, test 2.93.61).
The preoperational test results for the reactor containment fan coolers (RCFC) fan flows were slightly below the nominal flow listed in the FSAR for these fans. The test results were accepted and tne test was approved. This letter contains a detailed reevaluation of the test results and confirms their acceptability.
4 RCFC fan flow at low speed was measured during this test. Together with the heat transfer rate of the RCFC cooling coils, the heat removal capability of the RCFCs can be determined. Heat removal capability of the RCFCs is the parameter used in FSAR accident analysis to determine the containment temperature profile following a LOCA or main steamline break.
Attachment A summarizes two sets of data taken for the RCFC fan flows - testing and balancing (TAB) data and preoperational test data. TAB is a construction activity performed prior to the formal preoperational test. TAB data was taken at an elevation on the RCFC stacks and at the fan itself. This data indicates each RCFC housing leaks a certain amount. The preoperational test data was only taken at an elevation on the RCFC stack. A housing leakage factor from the TAB data was applied to the preoperational test data to obtain actual fan performance. Fan performance is then compared to the nominal flow listed in the FSAR (59,000 CFM). The preoperational test data for both trains of fans is approximately 2% below the PSAR value.
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V,o 8701210119 870113 PDR ADOCK 05000455 P_.
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d Mr. H. R. Denton January 13, 1987 Attachment B is an abstract from a Wyle Laboratories test report on the heat transfer performance of the RCFC cooling coils.
It states the RCFC coils perform 10 to 20 percent higher than anticipated by design at higher temperature and pressures.
During the initial stages of a LOCA or main steamline break, virtually all of the heat removal by the RCFC coils is latent heat by the condensing of steam in the steam-air mixture passing across the coils. If it were conservatively assumed that there is no film condensation saturation on the cooling coils, then there would be a direct relationship between air-steam flowrate and coil heat removal rate.
Using this conservative assumption, it can be seen there is at least 7% margin on the heat removal capability of the RCFCs (10% coil performance minus 3% fan flow).
If the TAB data is used in combination with maximum coil performance of 20% greater than design, a margin of at least 21% on RCFC heat removal capability would result.
Based on the above, we believe the margin in RCFC cooling coil performance adequately compensates for the slightly low RCFC fan flows.
Therefore, the containment ventilation system is capable of removing the design basis accident heat load. The detailed evaluation provided above satisfies our commitment in reference (a) to perform a reverification of containment cooling capability.
Please direct any questions you may have concerning this matter to this office.
Very truly yours, b.
K. A. Ainger Nuclear Licensing Administrator 1m l
l Attachments cc: Byron Resident Inspector l
Mary McCormick Barger - Region III l
Regional Office - PIII 2584K
s ATTACHMENT A Preop at Fan = Preop at RCFC Fan TAB at Fan TAB at Stack TAB Leakage Preop at Stack Stack I (1 + TAB % leakage)
(CFM)
(CFM)
(CFM)
(CFM)
(CFM) 2VP01CA 61,324 59,432 1892 3.09 54,992 56,691 i
i 2VP01CB 58,718 56,632 2086 3.55 55,277 57,239 2VP01CC 60,938 59,758 1180 1.94 58,238 59,358 2VP01CD 60,496 58,352 2144 3.54 55,810 57,788 A Train Fans:
2VP01CA and 2VP01CC B Train Fans:
2VP01CB and 2VP01CD Pre-Op Total Flow A Train = 56,691 + 59,368 = 116,059 CFM (98.4% of FSAR value)
Pre-Op Total Flow B Train = 57,239 + 57,788 = 115,027 CFM (97.5% of FSAR value)
TAB Total Flow A Train = 61,324 + 60,938 = 122,262 CFM (103.6% of FSAR value) i TAB Total Flow B Train = 58,718 + 60,496 = 119,214 CFM (101% of FSAR value)
All flows are corrected to design fan inlet conditions.
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WYLE LABORATDFdES
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I SCIENTIFIC SERVICES AND SYSTEMS group
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REPORT No._
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ADSTMCT A representative Coll *, manuf actured by the Carrier Corporation, was performance tested to determine conformance with the require-ments specified in Sargent and Lundy Specifications F-2733 and L-2733, titled "RCFC Fans-and Colls".
The test item was tested at Wyle Laboratories.
Evaluation of test results to determine confor,mance to the required specifications was performed by The Carrier Corporation and are included herein.
The purchaser of this coll is,, Commonwealth Edison. A coil of~thisidesign is to be installed in, the Bryon/Braldwood Huclear Power Station.
The test results, as well as anticipated performance, are shown In Figure 3, Appendix A.
There is cood correlation between test results and anticipated thermal performance at' relatively low temperature and pressure. At higher temperature and pressures, test results indicate performance which is 1.0 to 20 percent higher than anticipated.
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