ML19319D444
| ML19319D444 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 12/10/1976 |
| From: | Rodgers J FLORIDA POWER CORP. |
| To: | Stolz J Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8003170574 | |
| Download: ML19319D444 (3) | |
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3 Mr. John Stol:
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Dear Mr. Stol:
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As a result of numerous discussions with the NRC staf ern-ing our system design and operating methods to prevent boron precipitation during long-term post-accident cooling, FPC agreed to install flow rate instrumentation in the Decay Heat drop line and the auxiliary pressurizer spray line.
4 The addition of this flow rate instrumentation will enable the operator during long-term post-accident cooling to verify that the flow rate in the D.H. drop line or auxiliary pressurizer spray line is greater than 40 gpm.
The 40 gpm value is the minimun flow rate analyzed by B5W which maintained acceptable boron concentrations during post-accident long-term cooling (see B6W Topical Report BAW-10103).
Since our commitment to install these flow measuring devices, we have experienced continual. delays in delivery of this equip-ment from the manufacturer.
As of this writing, partial shipment of the new equipment has been received, with the remaining equip-ment to be shipped shortly.
Once received, the installation of the new equipment will require approximate 1'y one week.
As a result of these delays in equipment delivery beycnd the expected fuel load date, it was necessary to verify the ability to gravity drain from the hot leg of the Reactor Coolant System to the Reactor Building Sump via the D.H. drop line prior to the installation of the flow rate instrumentation in the drop line.
The test of the drop line flow rate was performed with the Reactor Vessel head removed, no fuel in the core, and the required water level in the hot leg piping of the Reactor Coolant System, as L.di L Generst Office 32o1 innty-fourtn street soutn. P.O. Box 14042, St. Petersburg. Fionda 33733 e 813-866-5151
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Mr'. John Stol: December 10, 1976 4
determined by visual and hand measurement.
Once these pre-requisities and the necessary flow path were established, the R.B. Sump outlet valve was opened allowing gravity draining from the hot leg to the sump.
The flow rate in the D.H. drop line was measured by the level instrumentation located in the R.B. Sump.
This test verified a flow rate of greater than 40 gpm in the D.H.' drop line and the test results are avail-able on site for review.
After installation of the flow rate instrumentation in the Decay Heat drop line, a test will be performed to verify the instruments performance.
The auxiliary pressurizer spray line has been previously tested to verify that flow does exist.
Once the flow rate instrumenta-tion has been installed, the auxiliary pressurizer spray line will be retested to verify that the flow rate is greater than 40 gpm.
Performance of this test will complete the verification of the flow rates required for preventing boron precipitation during long-term post-accident cooling for both modes of operation.
If you require further discussion, please contact us.
Very truly yours, l
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T. Rodgers Asst. Vice President JTR/iw e
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