ML19310A839
| ML19310A839 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 06/12/1980 |
| From: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| IEB-80-05, IEB-80-5, NUDOCS 8006300579 | |
| Download: ML19310A839 (3) | |
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FLORIDA POWER & licht COMPANY j y,, t U.L June 12, 1980 L-80-183 Mr. James P. O'Reilly, Director, Region II
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Office of Inspection and Enforcement gg U. S. Nuclear Regulatory Commis11on 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303
Dear Mr. O'Reilly:
Re: RII:JP0 (50-250,50-251)
IE BULLETIN 80-05 Florida Power & Light Company has reviewed the subject bulletin and offers the following response:
1.
Tanks with cover gas which can be valved to contain RCS water are provided in Table 1.
Also provided are the tank design pressures, their system designations and volumes. As requested in the bulletin, our evaluation will be limited to low pressure tanks, or tanks with an ir.ternal design pressure of 15 psig or belcN.
Thus, based on Table 1, only the CVCS Holdup Tanks and the Refueling Water Storage Tank (RWST) are considered. Adequate measures have been taken to protect these tanks against vacuum conditions that could result in tank damage.
These measures are discussed in our response to Iten 2 below.
2.
The systems reviewed in Item 1 included the Reactor Coolant System, the Chemical and Volume Control Systen, the Radioactive Waste Disposal Liquids System, and the Safety Injection System. As indicated in Item 1, the only tanks requiring further consideration are the CVCS Holdt? Tanks and the RWST.
The three CVCS Holdup Tanks are each designed in accordance with ASME Section III Class C and have a maximum external pressure capability of 3 15 inches water column.
Water can be withdrawn from the tanks via three (3) gas stripper feed pumps, each rated at 25 gpm. A holdup tank recirculation pump, rated at 500 gpm, is used to mix the contents of a tank or to transfer water l
between tanks. The gas space in the holdup tanks is vented to the vent header in the Radioactive Waste Disposal Gas Systen (RWDGS). A connection to the RWDGS cover gas header is also provided as well as a backup nitrogen supply to maintain the tanks under positive pressure and prevent inleakage of air.
Nonnal operating pressure of the holdup tanks is 3 psig, provided cover gas from the cover gas header is available.
In the event the cover gas
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header is out of commission, a Nitrogen backup supply has been provided l
to maintain tank pressure at a minimum of 1 psig.
800630053 ()
OFFICIAL COFk.
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v Mr. James P. O'Reilly Page 2 Each holdup tank is provided with two vacuum breaker valves, which will operate automatically if the pressure in the tank decreased below 3 inches (w.c.) vacuum.
Each vacuum breaker valve has a maximum capacity of 100 scfm when fully open (at a vacuum of 6 inches w.c.).
Assuming that the recirculation pump is operating at runout capacity of 700 gpm and the gas stripper pumps are operating at a rated capacity of 25 gpn each, the maximum gas flowrate out of the tank is1104 scfm.
The syst s is designed and operated such that operation of the vacuum breakers is minimized.
The following features are provided to accomplish this:
a) The tanks are provided with cover gas from the gas decay tanks via the cover gas header with a Nitrogen backup supply.
The N backup supply pressure regulator is capable of supplying 35 scfm 2
(equivalent to 3 240 gpm) @ 1 psig set pressure.
b) The holdup tank recirculation pump stops automatically when the tank pressure decreases to 1 psig.
c)
A low pressure alarm, set at 1 psig is provided in the local I
control panel to alert the operator of a possible system malfunction.
d) Administrative procedures have been established to prevent transfer of liquid between tanks by gravity unless the respective tart wnt line valves are open.
The vacuum protection of the RWST was also investigated.
A calculation was pericaed assuming that all of the pumps taking suction on the RWST would bc 9;,ud.1ng at their maximum flowrate simultaneously.
The results j
are that the MT has sufficient vent capability (a factor of safety of 10.8)
Based on the above discussion, the existing measures for vacuum
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protection at Turkey Point Units 3 and 4 are adequate and no further modifications are required.
Very truly yours, Robert E. Uhrig Vice President Advanced Systems & Technology REU/ MAS /cph Director, Office of Inspection and Enforcenent cc:
Harold F. Reis, Esquire j
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l TABLE 1 TANK SYSTEM QUANTITY VOLUME DESIGN PRESSUP.E (Gal)
Psig 1.
Pressurizer RCS 1/ unit 9724 100 Int.
Relief Tank 2.
Reactor Drain RWDLS 1/ unit 350 25 Int.
Tank 3.
Volume Control CVCS 1/ unit 2244 75 Int./15 Ext.
Tank 4.
CVCS Holdup CVCS 3/2 units 97240 each 15 Int.
Tanks 5.
Refueling Water SIS 1/2 units 338,000 Atmospheric Storage Tank I
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