ML19321B331
| ML19321B331 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 07/29/1980 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8007310416 | |
| Download: ML19321B331 (2) | |
Text
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400 Chestnut Street Tower II July 29, 1980 Director of Nuclear Reactor Regulation Attention:
Mr. A. Schwencer, Chief Light Water Reactors Branch No. 2 Division of Licensing U.S. Nuclear Regulatory Commission Washington, DC 20535
Dear Mr. Schwencer:
In the Matter of the Application of
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Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 Enclosed is additional information requested by O. Parr, Auxiliary Systems Branch Chief, on temperature control for the main steam valve rooms at Sequoyah Nuclear Plant.
If you have any questions, please get in touch with D. L. Lambert at FTS 857-2581.
Very truly yours, TENNESSEE VALLEY AUTHORITY T.,
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L. M. Mills, Manager Nuclear Regulation and Safety Enclosure D
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ENCLOSURE SEQUOYAH NUCLEAR PLANT Temperature Control System for the Main Steam Valve Rooms The main steam safety valves are set such that they will operate (open) at their technical specification set pressure in an ambient environment of 80*F and 120*F.
The 120*f limit is chosen in order to maintain margin between the set pressure (which decreases with increasing room temperature) and the steam line operating pressure. This reduces unnecessary actuations and potential economic penalties.
If the control system should fail, the temperature in the main steam valve room will remain above 80*F when the primary system is at rated temperature. Thus, with the temperature control system operable or inoperable, the main steam safety valves will open at or below their technical specification set pressure.
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