IR 05000395/1979017
| ML17146B284 | |
| Person / Time | |
|---|---|
| Site: | Summer  |
| Issue date: | 08/06/1979 |
| From: | Murphy C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Mary Johnson SOUTH CAROLINA ELECTRIC & GAS CO. |
| Shared Package | |
| ML17146B285 | List: |
| References | |
| NUDOCS 7909270430 | |
| Download: ML17146B284 (3) | |
Text
TWO NORTH NINTH STREET, ALI.ENTOWN, PA.
18101 PHONE:
(21'5)
821-5151 NORMAN W. CURTIS Vice President Engineering 8 Construction 821-538 I August 8, 1979 Mr. Boyce Director, Region I U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 17406 SUSQUEHANNA STEAM ELECTRIC STATION UPDATE OF STATUS CIRCLE SEAL SOLENOID VALVES WITH DEFECTIVE DIODES ERs 100450/100508 FILE 840-4 PLA-389
Dear Mr. Grier:
This supplements and amends PPGL's position as presented in PLA-376, dated June 28, 1979>
PLA-361,, dated May 22, 1979; and PLA-336, dated March 23, 1979.
The referenced correspondence identified a deficiency which was considered to be reportable under the provisions of 10 CFR 50.55(e).
However>
PP&L has analyzed'echtel MCAR-1>>31 which documented the deficiency and Bechtel's final evaluation of the Circle Seal valves and their impact on safety and, based upon the rationale and analysis of safety implicationsr concludes that the condition is not reportable under the provisions of 10 CFR 50.55(e).
We arrive at this conclusion because the present approved Susquehanna design does not provide for the use of Circle Seal Pilot Solenoid Valves in any location where the failure of the subject diodes on these valves could have caused or led to the disablement of a safety system necessary for safe operation or shut down of the plant.
PPGL and Bechtel shared a concern regarding the possibility that future system designs or modifications could have inadvertently resulted in the utilization of the suspect Circle Seal solenoid valves which were being held in inventory.
Therefore, PPaL directed Bechtel to return all such valves> both Q and non-Q, to Circle Seal for replacement of the existing diodes with a higher quality diode manufactured by Semtech Corporation.
PENNSYLVANIA POWER IL LIGHT COMPANY
Mr. Boyce August. 8, 1979 We review this action as conservative, with the expressed intent of avoiding any possibility of introducing valves with inadequate diodes into safety systems.
Very truly yours, AA N.
W. Curtis Vice President-Engineering a Construction ARS:mcb cc:
Mr. Victor Stello (15)
Directoi-Office of Inspection a Enforcement U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. G. McDonald, Director (1)
Office of Management Information 6 Program Control U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Mr. Robert M. Gallo, Reactor Inspector U. S. Nuclear Regulatory Commission P.
O. Box 52 Shickshinny, Pennsylvania 18655
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