ML19319D459
| ML19319D459 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 01/12/1977 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Rodgers J FLORIDA POWER CORP. |
| References | |
| TAC-07125, TAC-7125, NUDOCS 8003170588 | |
| Download: ML19319D459 (2) | |
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O NRC PDR Local PDR LWR-1 FH e JAN 12 1977 f, fs Docket Ho. 50-302 i 11 ams J. Stolz Florida Power Corporation f
n ATTN: Mr. J. T. Rodgers ACRS (16)
Assistant Vice President and ELD Nuclear Project Manager IE (3)
P.O. Box 14042 H. Smith St. Petersburg, Florida 33733 bec:
J. R. Buchanan, NSIC Thomas B. Abernathy, TIC REACTOR CODLANT SYSTEM FLOW DIFFERENTIAL PRESSURE TRANSMITTERS -
CRYSTAL RIVER UNIT 3 In Supplement No. 2 to our Safei:y Evaluation Report on Crystal River Unit 3 which was issued on December 3,1976, we stated that we were evaluating the need to modify the reactor coolant system flow indi-cation because all four differential pressure transmitters in each flow measuring device, in each of the two reactor coolant hot legs.
are connected to a comon pressure sensing line. Our concern in this i
regard is that a failure of the comon pressure sensing line could result in reactor operation outside of acceptable limits described in Figure 2.2-1 of the plant Technical Soecifications.
Our position is that the nuclear overoower functional unit based on reactor coolant system flow and axial power imbalance, which is part of the reactor protection system, does not meet the single failure criterion as presently designed because of the comon pressure sensing line to the flow differential pressure transmitters, and should therefore be modified to meet the single failure criterion.
We request that you provide a response to our position as stated above, within 30 days after receipt of this letter, indicated your intention with regard to complying with our position. Your response should also include details of the design modification which you propose to make and your schedule for the completion of the installation of the modification.
Please' contact us if you have any riuestions concerning this matter.
Sincerely, Original Signed by John F. Stolz John F. Stolz, Chief p
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