ML20073J823
| ML20073J823 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 04/08/1983 |
| From: | Tucker H DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8304190421 | |
| Download: ML20073J823 (3) | |
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4 DUKE POWER GOMPAhT "j p C p { r. _ ; N ' l P.O. BOX 33189
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-83 APR 13 AID : 12
.Mr. James P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303 Re: Catawba Nuclear Station Units 1 and 2 Docket Nos. 50-413 and 50-414
Dear Mr. O'Reilly:
Pursuant to 10 CFR 50.55e, please find attached Significant Deficiency Report SD 413-414/83-03.
Very truly yours, O w/E Hal B. Tucker RWO/php Attachment cc: Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission f
Washington, D. C. 20555 Mr. P. K. Van Doorn l
NRC Resident Inspector i
Catawba Nuclear Station Mr. Robert Guild, Esq.
l Attorney-at-Law P. O. Box 12097 Charleston, South Carolina 29412 Palmetto Alliance l
2135 Devine Street Columbia, South Carolina 29205 INPO Records Center Suite 1500 1100 circic 75 Parkway Atlanta, Georgia 30339
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Duke Power Company Catawba Nuclear Station Report Number: SD 413-414/83-03 Report Date: April 8, 1983 Facility: Catawba Nuclear Station, Units 1 & 2 Identification of Deficiency:
Present control schemes for modulating active valves may not allow the valves to reach their fail-safe mode in a harsh environment and/or seismic event con-current with a LOCA. This deficiency was identified February 15, 1983.
Initial Report:
On March 9, 1983, A Ignatonis, NRC Region II, Atlanta, Georgia was notified of the subject deficiency by W. O. Henry, D. L. Canup and M. L. Childers of Duke Power Company, Charlotte, North Carolina 28242.
Component and/or Supplier:
This deficiency is a result of Duke Power Company's control scheme for air actuated control valves in which solenoid valves and valve actuators are qualified but the valve positioners are not.
Description of Deficiency:
Present control schemes for modulating active valves may not allow the valves to reach their fail-safe mode in a harsh environment and/or seismic event concurrent with a LOCA. With the present configuration, non-qualified posi-tioners must allow air to vent from valve actuators for the valves to reach their fail-safe position. This is due to the safety solenoid valves being located between the controllers and positioners (positioners are between Class lE solenoid valves and valve actuators). See Attachment. Therefore, the potential exists for these control valves to not reach their fail-safe positions.
Analysis of Safety Implications:
Failure of these control valves to reach their fail-safe mode could result in inadequate emergency core cooling capabilities by means of:
- 1) Inadequate Nuclear Service Water flow to Component Cooling heat exchangers.
- 2) Inadequate Component Cooling flow and/or Residual Heat Removal flow through Residual Heat Removal heat exchangers.
Corrective Action:
Duke will relocate Class lE solenoid valves between valve actuators and valve positioners. This will eliminate dependency on the positioner for venting the valve actuator to the fail-safe position and resolve this deficiency. This corrective action will be completed by September 15, 1983.
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