ML20003B141
| ML20003B141 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 02/04/1981 |
| From: | Nichols T SOUTH CAROLINA ELECTRIC & GAS CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.03, TASK-TM NUDOCS 8102100416 | |
| Download: ML20003B141 (2) | |
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SOUTH CAROLINA ELECTRIC a GAS COMPANY POST OFFICE 80x 764 COLUMBIA. SOUTH CAROLINA 29218
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T. C. NicMots, J R.
Vict Potstormt A80 Gaove Cascv?vyt February 4, 1981 NucLEAm O.cnams L
Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
20555 I
Subject:
Virgil C. Summer Nuclear Station Docket No. 50/395 t
Unexpected Lifting of Pressurizer Safety Valve
Dear Mr. Denton:
This report is submitted in accordance with the requirements of
'NUREG 0737, Item IIK.3, Table C.3 Item 3.
It reflects all events con--
cerning the fa11ure of or challenges to safety / relief valves which occurred at the Virgil C. Summer Nuclear Station through December, 1980.
i Following is a synopsis of our single such event.
I On September 7, 1980, pressurizer safety valve 8010B unexpectedly
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lifted during the performance of Preoperational Test RC-3, " Pressurizer Pressure and Level Control Functional Test".
This procedure calls for f
Reactor Coolant System (RCS) pressure to be manually increased to verify control functions, alarms, etc.
As RCS pressure was increased, the sub-I ject valve lifted at 2380 psig which is below the proper lift pressure of-2485 psig.
The valve will be reset as a part of the preoperational test program.
There were no failures of valve components or associated systems.
The cause of this event has been determined to be improper setpoint set-ting and is therefore classified as a " challenge.to" pressurizer safety i
valve 8010B.
If further information is needed concerning this matter, please contact me.
a to Very truly yours, p
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T. C. Nichols, Jr.
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cc: Messrs. V.C. Summer G.H. Fischer T.C. Nichols, Jr.
E.H. Crews,'Jr.
O.W. Dixon, Jr.
W.A. Williams, Jr.
O.S.'Bradham D.A. Nauman R.B. Clary
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