ML20108B620
| ML20108B620 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 10/25/1984 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| ANPP-30951-TDS, DER-84-72, NUDOCS 8411160124 | |
| Download: ML20108B620 (3) | |
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October 25, 1984 ANPF-30951-TDS/TRB U. S. Nuclear Regulatory Commission Region V Creekside Oaks Office Park 1450 Maria Lane - Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. T. W. Bishop, Director Division of Reactor Safety and Projects
Subject:
Interim Report - DER 84-72 l
A 50.55(e) Potentially Reportable Deficiency Relating To HPSI Pump Miniflow Isolation Valve.
File: 84-019-026; D.4.33.2 l
Reference:
Telephone Conversation between C. Sorenson and T. Bradish on September 25, 1984
Dear Sir:
The NRC was notified of a potentially reportable deficiency in the referenced telephone conversation. At that time, it was estimated that a determination of reportability would be made within thirty (30) days.
Due to the extensive investigation and evaluation required, an Interim Report is attached.
It is now expected that this information will be finalized by November 15, 1984, at which time a complete report will be submitted.
Very truly yours, 7(
h E. E. Van Brunt, Jr.
APS Vice President Nuclear Production ANPP Project Director EEVB/TRB/nj Attaciment cc: See Page Two 8411160124 841025 PDR ADOCK 05000528 1
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1 Mr. T. W. Bishop DER 84-72 Page Two cc:
Richard DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission Washington, D. C.
20555 T. G. Woods, Jr.
D. B. Karner W. E. Ide D. B. Fasnacht A. C. Rogers L. A. Souza D. E. Fowler T. D. Shriver C. N. Russo J. Vorees J. R. Eynum J. M. Allen A. C. Gehr W. J. Stubblefield W. G. Bingham R. L. Patterson R. W. Welcher H. D. Foster D. R. Hawkinson R. P. Zimmerman L. Clyde M. Woods T. J. Bloom Records Center Institute of Nuclear Power Operations 1100 circle 75 Parkway, Suite 1500 Atlanta, CA 30339 l
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. INTERIM REPORT - DER 84-72 POTENTIAL REFORTABLE DEFICIENCY ARIZONA PUBLIC SERVICE COMPANY (APS)
PVNGS UNIT 1 I.
Potential Problem During the performance of preoperational test procedure 91PE-lSIO8, HPSI pump miniflow isolation valve lJSIBUV667 failed to completely close. The limitorque motor operator failed to close the valve as a result of an over-torque condition. The torque switch in the motor operator had previously been set to the maximum position on the limiter plate. During the test, the pressure across the valve was approximately 1650 psid. This condition was documented on Nonconformance Report (NCR) SM-4338.
II.
Approach To and Status Of Proposed Resolution The failure of the valve to completely close was attributed to excess packing friction. However, a similar failure of a Unit 2 valve (2JSlAUV666) that performs the same function has recently been identified by SFR 2SI-3267 Preliminary evaluations indicate that these failures may be attributed to a cause other than excessive packing friction. Bechtel Engineering and Combustion Engineering are evaluating this condition to determine the root cause, reportability, and corrective action.
III.
Projected Completion of Corrective Action and Submittal of the Final Report The complete evaluation and final report are forecast to be completed by November 15, 1984 1
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