ML19322B904
| ML19322B904 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 11/21/1973 |
| From: | Thies A DUKE POWER CO. |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 7912120760 | |
| Download: ML19322B904 (2) | |
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4 AEC DI7IBUTION F02 PART 50 DOCKET MA*"" RIAL (TEMPORARY FORM)
CONTROL NO: 8450 t
s FILE:
FRW:
DATE OF DOC DATE REC'D LTR MEMO RPT OTER Duke Power Company
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Charlotte, N. C. 28201 11-21-73 11-26-73 X
A. C. Thies TO:
A. Giambusso 1 signed SENT LOCAL PDR X
CLASS UNCLASS PROP INFO INPUT NO CYS REC'D DOCKET NO:
XXXX 1
50-269 DESCRIPTION:
ENCLOSURES:
Ltr re their 10-25-73 ltr, furnishing addl info to Unusual Rpt UE-269/73-8, re " Main Steam Re-lief Valve Operation"..................
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November 21, 1973 RE PLATSRY h[
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Mr. Angelo Giambusso N / Q g
Deputy Director fer Reactor Pro.je w
Directorate of Licent.'ng
,4 Office of Regulation U. S. Atomic Energy Commission
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Washington, D. C.
20545 Re:
Oconee Unit 1 Docket No. 50-269
Dear Mr. Giambusso:
My letter of October 25, 1973 transmitted to you Unusual Event Report UE-269/73-8, " Main Steam Relief Valve Operation." This report stated that the main steam relief valves for Oconee Unit I had lifted following reactor trips from power levels less than 40 percent full power. The Oconee FSAR states that the combined actions of the control system and the turbine bypass valves should permit a 40 percent load reduction or a turbine trip from 40 percent load without safety valve action.
We indicated that further testing of the turbine bypass system, including a turbine trip test from 40 percent power or higher, was necessary and that we would keep you advised of the results.
On October 27, 1973, a turbine trip test from 40 percent full power was conducted. The turbine bypass system functioned as designed and the main steam relief valves did not lif t.
The turbine bypass systems for both Oconee Unit I and 2 have been modified to supply adequate motive force to the bypass valves.
These modifications should prevent any recurrence of this incident.
l Very truly yours, A. C. Thies ACT:vr cc:
Mr. Norman C. Moseley l
C 150