ML17304A430
| ML17304A430 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 08/29/1988 |
| From: | Karner D ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| IEB-88-004, IEB-88-4, NUDOCS 8809070301 | |
| Download: ML17304A430 (6) | |
Text
acczmmT@hULArrgR~5, Dg@)AQ~KIW~RIR'srzx ACCESSION NBR:8809070301 DOC.DATE: 88/08/29 NOTARIZED: NO, DOCKET 8
FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 STN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi 05000530 AUTH.NAME AUTHOR AFFILIATION KARNER,D.B.
Arizona Nuclear Power Project (formerly Arizona Public Serv RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
//6'71 '~
SUBJECT:
Forwards addi info re evaluation results for auxiliary ~>
feedwater pumps
& status of review for remaining pumps.
F
+ /
DISTRIBUTION CODE:
IE11D COPIES RECEIVED:LTR I
ENCL L SIZE:
TITLE: Bulletin Response (50 DKT)
NOTES:Standardized plant.
Standardized plant.
Standardized plant.
05000528 05000529 05000530 RECIPIENT ID CODE/NAME PD5 LA LICITRA,E INTERNAL: AEOD/DOA AEOD/DSP/TPAB NRR RIVENBARKPG NRR/DEST/ADS 7E NRR/DOEA/EAB 11 NRR/DREP/EPB 10 NUDOCS-ABSTRACT RES/DSIR/EIB EXTERNAL: LPDR NSIC NOTES:
COPIES LTTR ENCL 1
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1 RECIPIENT ID CODE/NAME PD5 PD DAVIS,M AEOD/DSP NRR ALEXIONPT NRR/DEST/ADE 8H NRR/DEST/MEB 9H NRR/DOEA/GCB 11 NRR ZLRB12 EG F 02 FILE 01 NRC PDR COPIES LTTR ENCL 1
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1 TOTAL NUMBER OF COPIES REQUIRED:
LTTR 24 ENCL 23
I[
Arizona Nuclear Power Project P.O. BOX 52034
~
PHOENIX, ARIZONA85072-2034 Docket Nos.
STN 50-528/529/530 161-01270-DBK/BJA August 29, 1988 Document Control Desk U.
S. Nuclear Regulatory Commission Mail Station Pl-137 Washington, D.C.
20555
References:
(1)
Letter from Charles E.
- Rossi, NRC, to All Holders of Operating Licenses or Construction Permits for Nuclear Power Reactors dated May 5,
1988.
Subject:
NRC Bulletin No.
88-04, Potential Safety-Related Pump Loss.
(2)
Letter from E.
E.
Van Brunt, Jr.,
ANPP, to USNRC Document Control Desk dated July 8,
1988 (161-01159)
~
Subject:
Response
to NRC Bulletin No. 88-04.
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1, 2 and 3
Additional Response to NRC Bulletin No. 88-04 File:
88-A-056-026, 88-055-026 The NRC has issued NRC Bulletin No. 88-04 via Reference (1).
This bulletin concerns the potential loss of safety related pumps due to deficiencies in the minimum flow recirculation design for the pumps.
ANPP's initial response to this bulletin was provided to the NRC by Reference (2).
In this initial
- response, ANPP committed to provide an additional response after the pump vendors'valuations were received and reviewed by ANPP.
At this time, the vendor evaluation of the auxiliary feedwater pumps has been received by ANPP.
The attachment to this letter provides a summary of the evaluation results for the auxiliary feedwater pumps and the status of the review for the remaining pumps.
If you have any additional questions on this
- matter, please contact Mr. A.
C. Rogers at (602) 371-4041.
Very truly yours, 880907030i 8808 9 PDR ADOCK 05000528 G
DBK/BJA/dim Attachment cc:
G.
W. Knighton M. J.
Davis J.
B. Martin T. J. Polich A.
C. Gehr (all w/a)
D.
BE Karner Executive Vice President
+eel (
ATTACHMENT PUMP VENDOR EV LUAT ON ESULTS ANPP requested assistance from the applicable pump vendors to complete our evaluation for NRC Bulletin 88-04.
Two pump vendors were involved with the evaluation.
Sulzer Bingham Pumps, Inc. supplied the auxiliary feedwater pumps to PVNGS.
Ingersoll-Rand.
Company supplied the condensate transfer pumps and the safety injection pumps (containment spray, low pressure safety injection, and high pressure safety injection) to PVNGS.
Each of the pump vendors was asked to determine if the existing minimum flow rates were sufficient to preclude pump damage during minimum flow operations.
The results of the vendor evaluations are provided below.
1)
Auxiliar Feedwater Pum s:
Sulzer Bingham Pumps, Inc.
was provided with information on
,the amount of time that the pumps are expected to be operated at minimum flow conditions for the 40 year life of the plant.
The'umps have a
minimum flowrate of approximately 240 gpm or higher.
The pump vendor's evaluation indicated that a
short term minimum flowrate of no less than 165 gpm would be sufficient to prevent excessive internal wear to the pumps.
The short term condition is where the pumps are operated at the minimum flowrate for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> or less in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.
The vendor also stated that the continuous minimum flowrate for the pumps is 240 gpm or higher.
In conclusion, since the pumps at PVNGS have a minimum flowrate that is approximately the same or higher than the continuous minimum flowrate required by the pump vendor, the current minimum flowrate is acceptable.
No further actions are required for the auxiliary feedwater pumps at PVNGS.
2)
Condensate Transfer Pum s and Safet In ection Pum s
Ingersoll-Rand has not completed their evaluation of the minimum flow rates for the condensate transfer and safety injection pumps.
Ingersoll-Rand is'n the process of developing prediction methods to estimate pump life versus low flow operations.
- However, based on their review of the existing minimum flowrates at PVNGS, they have informed ANPP that the current minimum flowrates are adequate to prevent short-term damage to the pumps.
Ingersoll-Rand's additional evaluation will investigate the potential for long-term pump damage.
Ingersoll-Rand has informed ANPP that they will complete their evaluation by mid-October, 1988.
The results of this evaluation will be provided to the NRC following ANPP's review of the vendor's evaluation.