ML20106E093
| ML20106E093 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 10/10/1984 |
| From: | Van Brunt E, Van Brutn E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| ANPP-30785-TDS, DER-84-68, NUDOCS 8410290025 | |
| Download: ML20106E093 (3) | |
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- Arizona Public Service Company
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g7 October 10, 1984 ANPP-30785-TDS/TRB N YI4 U. S. Nuclear Regulatory Commission Region V Creekside Oaks Office Park 1450 Maria Lane - Suite 210 Walnut Creek, Calif ornia 94596-5368 Attention: Mr. T. W. Bishop, Director Divi-fon of Resident Reactor Projects and Engineering Programs
Subject:
Interim Report - DER 84-68 A 50.55(e) Potentially Reportable Deficiency Relating To The Essential Chiller Temperature Switch.
File:
84-019-026;'D.4.33.2-Ref erence: Telephone Conversation between L. Miller and K. Parrish on September 10, 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 October 30, 1984, at which time a complete report will be submitted.
Very truly yours,
\\
L.
- QR Th LO /N E. E. Van Brunt, J r.
APS Vice President Nuclear Production ANPP Project Director EEVB/TRB/nj Attachment cc: See Page Two 8410290025 841010 I(
PDR ADOCK 05000528 8
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Mr. T. 'W. Bishop DER 84-68'
. Page Two-
- cc:
Richard DeYoung, Director
-iOffice of Inspection and Enforcement
.U; S; Nuclear Regulatory Connaission 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. Bynum J. M. Allen A. C. Gehr W. J. Stubblefield-W. G. Bingham 1
R. L. Patterson R. W. Welcher H.'D. Foster.
'D. R. Hawkinson
. R. P. Zimmerman N
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.L. Clyde M. Woods T. J. Bloom
' Records Center Institute of Nuclear-Power Operations 1100 circle. 75 Parkway, Suite 1500 Atlanta, GA 30339 L.-
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INTERIM REPORT - DER 84-68 POfENTIAL REPORTABLE DEFICIENCY-ARIZONA' PUBLIC SERVICE COMPANY ( APS)
PVNGS UNIT 1
-I..
Potential Problem -
-During integrated safeguards pretesting, it was discovered that Train A. essential chiller would not resequence "back on line" af ter an SIAS followed by a LOP followed by a DG breaker closure.. Further investigation showed that the reason for the restart lockout was due to temperature switch 1J-ECA-TSH-505 tripping after the LOP. This switch monitors the compressor bearing for high oil temperature. It was found that this switch would be in' the tripped state af ter a loss of control
- power. (or LOP) if bearing temperature was above the reset temperature (168* t 22*F).
If control power was never lost L(or no LOP sequence); the switch would never trip unless -
' bearing, temperature rose above the trip setpolat of
- 221*F i 11*F.
In a test run on 8/27/83; the chiller wau run
,.for 25 minutes then shut down. The bearing temperature was f ound to be. approximately 169'F.
The chiller could not be restarted -due-to temperature switch trip af ter momentary shutdown of control power.
5' II.
L Approach To and Status Of Proposed Resolution Bechtel Engineering-is currently ~ studying this problem to determine reportability 'and. technical juscification f or eorreetive action.
f
.III.
Projected Completion of Corrective Action and Submittal of the Final Report-s The complete evaluation and final report are f orecast to be
. completed by. October ~30;.1984 d
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