ML20073R319

Interim Deficiency Rept DER 83-16 Re Potential Failure of Diesel Generator Governor & Voltage Regulator to Automatically Reset from Manual/Test Mode Upon Loss of Power.Initially Reported on 830318.Final Rept by 830519

ML20073R319
Person / Time
Site:	Palo Verde
Issue date:	04/15/1983
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Sternberg D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
10CFR-050.55W, 10CFR-50.55W, ANPP-23514-RQT, DER-83-16, NUDOCS 8305030626
Download: ML20073R319 (3)

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' I?Ecmg t:Eg Arizona Public Service Company E33 Eg g Po box 21666 e PHOENIX. ARIZONA 85036 p'j *,*, i e,,5 April 15, 1983 Mpll) . ~

ANPP-23514-RQT/BSK pg U. S. Nuclear Regulatory Commission 9'Ako ,h Region V Creekside Oaks Office Park 1450 Maria Lane - Suite 210 Walnut Creek, California 94596-5368 Attention: Mr. D. M. Sternberg, Chief Reactor Projects Branch 1

Subject:

Interim Report - DER 83-16 A 50.55(e) Potentially Reportable Deficiency Relating to Diesel Generator Governor and Voltage Regulator Do Not Automatically Reset From Manual / Test Mode Upon Loss of Power File: 83-019-026; D.4.33.2

Reference:

Telephone Conversation between P. Narbut and R. Tucker on March 18, 1983

Dear Sir:

The NRC was notified of a potentially reportabic 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 May 19, 1983, at which time a complete report will be submitted.

Very truly y urs,

{ -

, CQL._ G(AA E. E. Van Brunt, Jr.

APS Vice President Nuclear Projects Management ANPP Project Director EEVB/RQT:db l

Attachment l cc: See Attached Page 2 8305030626 030415 PDR ADOCK 05000528 S PDR 2FB7

s U. S. Nuclear Regulatory Commission ANPP-23514-RQT/BSK April 15, 1983

-Page 2 i cc: Richard DeYoung, Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Commiasion Washington, D. C. 20555 T. G. Woods,-Jr.

G. C. Andognini J. A. Roedal D. B. Fasnacht A. C. Rogers B. S. Kaplan W. E. Ide J. Vorees

, J. R. Bynum

l. P. P. Klute/D. D. Green A. C. Gehr W. J. Stubblefield 2

W. G. Bingham R. L. Patterson R. W. Welcher 3

R. M. Grant D. R. Hawkinson L. E. Vorderbrueggen G. A. Fiorelli Records Center-Institute of Nuclear Power Operations 1100 Circle 75 Parkway, Suite 1500 Atlanta, Georgia 30339 i

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.e INTERIM REPORT - DER 83-16 POTENTIAL REPORTABLE DEFICIENCY ARIZONA PUBLIC SERVICE COMPANY (APS)

PVNGS UNITS 1, 2 & 3 I.. POTENTIAL PROBLEM Specification 13-MM-018, paragraph 4.4.3.3.5 requires that the Diesel Generator governor and voltage regulator manually operated droop mode be automatically reset to the isochronous mode in case of 4.16 kv Class lE bus undervoltage. While performing a Bechtel Engineering functional check of the Unit 1 Diesel Generator and subsequent review of applicable supplier data, Bechtel Engineering determined that, upon loss of power (LOP), the manual droop mode -

does not reset to isochronous mode for the governor or the voltage regulator.

II. APPROACH TO AND STATUS OF PROPOSED RESOLUTION Upon a LOP, the Diesel Generator starts in an emergency mode. The Engineered Safety Features System automatic sequencer simultaneously starts safety-related equipment. If the engine is still in a droop mode, underfrequency and undervoltage could occur. This could potentially result in damage to the actuated safety-related equipment, depending upon the load and droop speed setting. In addition, electric motors will not accelerate properly under the condition of undsrfrequency/

undervoltage. If left uncorrected, the functions of safety-related equipment could be imparired, constituting a safety significant condition representing a significant deficiency in final design.

III. PROJECTED COMPLETION OF CORRECTIVE ACTION AND SUBMITTAL OF THE FINAL REPORT Evaluation of this' condition and submittal of the Final Report is forecast to be completed by May 19, 1983.

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