ML19319D442
| ML19319D442 | |
| 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 8003170572 | |
| Download: ML19319D442 (2) | |
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~ O. s Mr. John Stol:
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Subject:
Crystal River Unit #3 e
Operating License DPR-72 N
Dear Mr. Stol :
At the request of the NRC, FPC made modifications to the Reactor Building Spray System to preclude a runout condition on the containment spray pumps or to prevent exceeding the margin available for net positive suction head to the pumps.
The modification to the spray system consisted of two separate sets of flow switches.
One set will control flow during the injection phase of operation while the second set would control during the recirculation phase.
During tests of the installed system, the second set of switches failed to perform the re-quired function due to the inherent valve characteristics in o
the near closed position at the lower flow rate for the re-i circulation phase of operation, which resulted in valv'e positlon oscillations.
For this reason, the spray system was modified to use manual throttling of the pump discharge valve during the recirculation phase of operation.
Following the completion of the modification to allow manual control in the recirculation phase, the R.B. Spray System was retested for both phases of operation and performed satisfac-torily.
The results of this test, as well as the test proce-.
dure, have been reviewed and accepted by the Inspection and Enforcement Branch of the NRC.
If you require anything further, please advise.
Very truly yours, gy 1~&.- s J.b. Rodge T
Asst. Vice President JTR/iw General Office 3201 Tncty-four:n s:reet soutn. P O Box 14042. st Petersburg. Flonca 33733 813 - 866-5151