ML20097H990
| ML20097H990 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 09/06/1984 |
| From: | Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | Bishop T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| ANPP-30445-TDS, DER-84-49, NUDOCS 8409210071 | |
| Download: ML20097H990 (3) | |
Text
.
4 n
Arizona Public Service Company Af Go lOA" /:,
8 }g,l's; Q
98 September 6, 1984 ANPP-30445-TDS/3RB U. S. Nuclear Regulatory Commission Region V Creekside Oaks Office Park 1450 Maria Lane - Suite 210 Walnut Creek, CA 94596-5368 Attention: Mr. T. W. Bishop, Director Division of Resident Reactor Projects and Engineering Prograen
Subject:
Interim Report - DER 84-49 A 50.55(e) Potentially Reportable Deficiency Reinting To
~ Auxiliary Feedvater System Experiencea Hydraulic Resonance.
File: 84-019-026; D.4.33.2
Reference:
Telephone Conversation between P. Narbut and T. Bradish on August 1, 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 in attached. - It is now expected that this information will be finalized by October 5,1984, at which time a complete report will be suhaitted.
Very truly yours, fEbb+/g E. E. Van Brunt, Jr.
-APS Vice President Nuclear Production ANPP Project Director EEVB/TRB/nj Attachment
.cc: See Page Two
^
8409210071 840906 PDR ADOCK 05000528 S
\\\\
+
Z$=J7
4 1
Mr. T. W. Bishop-DER 84-49
-Page Two cc:
Richard. DeYoung, Director
. Office of Innpection and Enforcement U. S. Nuclear Regulatory Comminnion Wanhington, D. C. 20555 T. G. Woods, Jr.
D.'B. Karner W. E. Ide D.'B.'Fannacht A. C.-Rogern L. A. Souza
-D. E. Fowler T. D. Shriver C..N. Runno-J. Voreen E'
~
.J.
R. Bynum J. M. Allen
'J. A. Brand D. Canady A. C. Gehr W. J. Stubblefield W. G. Bingham R. L.' Patternon R. W. Welcher-H. D. Foster D..R. Hawkinnon L.' E. Vorderbrueggen P
R. P. Zimmerman S. R. Frost L.~Clyde M. Wooda
^ ~
T. J. Bloom-
.-Records Center Institute of Nuclear Power Operationn 1100 circle 75 Parkway, Suite 1500 Atlanta, GA 30339 4
Y'
- - = - -
fo 4
. l T.
INTERIM REPORT - DER 84-49 POTENTIAL REPORTABLE DEF7lIENCY
~ ARIZONA PUBLIC-SERVICE COMPANY (APS)
PVNGS UNIT 1 I.
Potential Problem
- During.preoperational tenting of'the auxiliary feedwater pumps, the piping syntes connected to both the motor driven and turbine driven Q-Clann pumpa experienced hydraulic
- resonance when operating in the normal miniflow configuration with the first discharge block valve open and the regulating valve closed.
The ' piping' ayatem resonated at 7.5 Hertr. due to hydraulic resonance in the intake' pipe. The high vibration and the
. ansociated noise have been witnenned by visual and nural ohnervations and. documented by instrument records.
- Nonconformance Reports (NCR) SM-4497 and SM-4500 were issued when the deficiency was' discovered. During additional testing, it wen ohnerved that thin unstable condition disappears when either the miniflow is increased or the first discharge block valveein closed.
The Auxiliary Feedwater System in designed to provide
- emergency feedwater to the steam generators following a main steam line break, a main feedwater line break, or a tube
- rupture in the steam generator. Sustained pump operation in
.not permisnible with the high vibration and noise leveln ohnerved due to the rink of damaging the pumps and other
- nafety-related. components of the system.-
o
. II. -
Approach To and Statun Of Proposed Resolution Bechtel -Engineering in currently studying this problem to
. determine reportability and technical justification for corrective action.
1 III.
Projected Completion of Corrective Action and Submittal of the Final Report Evaluation of this condition and submittal of the Final Report
- in forecast to be completed by.0ctober 5,1984.
V V
F l
UN