ML20004E601
| ML20004E601 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 06/10/1981 |
| From: | Colbert W DETROIT EDISON CO. |
| To: | Kintner L Office of Nuclear Reactor Regulation |
| References | |
| EF2-53-516, NUDOCS 8106120383 | |
| Download: ML20004E601 (2) | |
Text
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" a22' June 10, 1981 EF2 - 53,516 Mr. L. L.
Kintner Division of Project Management Office of Nuclear Reactor Regulation U.
S.
Nuclear Regulatory Commission Washington, D. C.
20555
Dear Mr. Kintner:
Reference:
Enrico Fermi Atomic Power Plant, Unit 2 NRC Docket No. 50-341
Subject:
Response to Verbal Question, John Lane, June 3, 1981 Please find attached Detroit Edison's response to Mr. Lane's question on the SGTS test description-listed in FSAR Chapter 14.
The FSAR will be amended as indicated.
Sincerely, Y
th W.
F.
Colbert Technical Director Fermi 2 Project WFC/RMB:jl
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Question - John Lane, June 3,1981 1
1.
SGTS test description listed in FSAR Chapter 14 must measure the draw down and the in leakage amount. The FSAR should be revised to make this coemitment.
Response
Following a postulated loss-of-coolant accident, the pressure in the secondary containment could increase due to inleakage, air expansion due to equipment heat and the starting time of the SGTS. Analysis which considers the above phenomenon has been performed. The results of this atalysis show that app-roximately six (6) minutes af ter the loss-of-coolant accident, the secondary containment pressure is returned to a
.025 inches of water gauge with respect to atmosphere. Operation of only one of the two redundant SGTS trains, at a design flow of 3000 CFM, was assumed in this analysis.
w ill b e.
FSAR section 14.1.3. 2. 47.d '.2: 5:27. revised as follows:
14.1.3.2.47.d Acceptance Criteria.
3.
Each SGTS is capable of developing and maintaining the secondary containment at a negative pressure of Ic inch water gauge with respect to atmosphere. - This pressure differential is obtainable for the design bases condit-ions with the SGTS design flow of 3000 CFM.
4.
Each SGTS is capable of a draw down time equal to or less than that calculated for the design bases con-I ditions.
JRG/sim 6/9/81
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