ML19320D791
| ML19320D791 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 07/02/1980 |
| From: | Crews E SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-80-05, IEB-80-5, NUDOCS 8007220219 | |
| Download: ML19320D791 (2) | |
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^i; so49d 4i SOUTH CAROLINA ELECTRIC a gas CoNP POST OFFitt SOR 784 COLUH8'A SOUTH CAROLINA 29218 E. H. Ca rws. J n.
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July 2, 1980 Mr. James P. O'Reilly U. S. Nuclear Regulatory Commission Region II Suite 3100 101 Marietta Street, N. W.
Atlanta,"CA 30303
Subject:
V. C. Summer Nuclear Station, Unit 1 Response to IEB 80-05,
" Vacuum Condition Resulting in Damage to Chemical Volume Control System (CVCS)
Holdup Tanks (sometimes called
" Clean Waste Receiver Tanks")".
RII: JPO 50-395
Dear Mr. O'Reilly:
South Carolina Electric & Gas Company has completed action Items 1 and 2 of IEB 80-05 and has found that all tanks have an open line to the
. plant atmosphere or an open line directed to the plant vent system to preclude a tank vacuum condition from existing. No valves are installed in these vent lines.
Three tanks, the Waste Monitor Tanks, XTK-22A-WL and 22B-WL, and the Laundry and Hot Shower Tank, XTK-50-WL, have vents which will restrict the flow of relieving air to the point that the external design pressure may be compromised.
ilowever, calculations for the collapse pressure show that the internal vacuum would only be a maximum of 2 percent of the tank collapse pressure.
In order to prevent compromising, the external design pressure of the Waste Monitor Tanks and the Laundry and Hot Shower Tank, the size of the vent line on these tanks will be increased to prevent a vacuum condition from existing during tank drawdown.
Attachment I lists the tanks evaluate in response to IEB 80-05.
This is a final report on IEB 80-05.
IfIouhaveanyquestionsor if I may be of further assistance, please 11 me.
er ly yours, I
f_
=7 E. H. Crews, Jr.
MDQ:rm Enclosure CC:
U. S. Nuclear Regulatory Commission
.,,,f;;.g,( p-
-Office of Inspection and Enforcement 8007220 I. G Washington, DC 20555 j
a ATTACHMENT 1 CODE
-EXTERNAL DESIGN VENT SIZE MAXIMUM EXPECTED' TAG NO.
DESCRIPTION CLASS PRESSURE, psi INCHES DIAPHRAGM DRAWDOWN RATE SCFM 5-RC Pressure relief tank NNS 15 psig 3/4 No 13.4 6A,B-BR Recycle holdup tank 3
ATM 2-6 RV Yes 13.4 8-CD Condensate storage tank 3
ATM 10 RV Yes 669 12A,B-CS Boric acid tanks 3
ATM 2 RV Yes 10' 16-CS Boric acid batching tank NNS ATM 3
No 10 22A,B-WL Waste monitor tanks NNS ATM 1
No 13.4 25-SF Refueling war.er stg. tank 2
ATM 8
No 669 26-WL Waste holdup tank 3
ATM 2
No 13.4 29-SI Boron injection surge tank 3
ATM 2
No 2.7 32-WL.
Waste evaporator condensate NNS ATM 1 top Yes 13.4
'34-WL Chemical drain tank NNS ATI!
2 No 13.4 39-MU Reactor makeup stg. ta e.
3 ATM 10 RV Yes 20 a
46-CS Volume control tank 2
15 psig 3
No 12 48-WL Reactor coolant drain tank NNS 60 psig 3/4 No 13.4 49-WL Waste evap. conc.' holdup NNS ATM l-2", 1-1" No 4.7 50-WL Laundry and hot shower tank NNS ATM 1
No 13.4 SI-WL Floor drain tank NNS ATM 2
No 13.4 61-NB Nuclear blowdown sys holdup NNS ATM 2 RV Yes 33.5 62-NB Nuclear Blowdown,sys. monitor NNS ATM 2 RV Yes 33.5 ll5A,B-WX Excess waste holdup and decon.
NNS ATM 1
No 4.7 pit collection tanks RV-roof vent