ML17313A860
| ML17313A860 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 03/16/1999 |
| From: | Ide W ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 102-04260-WEIAK, 102-4260-WEIAK, NUDOCS 9903240219 | |
| Download: ML17313A860 (20) | |
Text
CATEGORY j.
REGULAT Y INFORMATION DISTRIBUTIO SYSTEM (RIDS)
SUBJECT:
Forwards revised relief recpxests PRR-OS,PRR-06 2 PRR-11 to clarify that proposed design flow testing for LPSI,HPSI 6
containment spray pumps will be performed using instruments that comply with Code recpxirements,per 990226 telcon.
DISTRIBUTION CODE: A047D COPIES RECE1VED:LTR ENCL SIZE:
TITLE: OR Submittal: Inservice/Testing/Relief from ASME Code
- GL A T
04 05000528 0500052cP 05000530
- NOTES:STANDARDIZED PLANT Standardized plant.
Standardized plant.
ACCESSION NBR:9903240219 DOC.DATE: 99/03/16 NOTARIZED: NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1,,Ax:izona 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 IDE,W.E.
Arizona Public Service Co.
(formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION Records Management Branch (Document Control Desk)
C RECIPIENT ID CODE/NAME PD4-2 LA FIELDS,M INTERNAL: A R IL CENTER 01 NUDOCS-ABSTRA'CT RES/DET/EIB EXTERNAL: LITCO ANDERSON NRC PDR COPIES LTTR ENCL 1
1 1
1 1
1 1
1 1
1 1
1 1
1 1
1 RECIPIENT ID CODE/NAME PD4-2 PD AEOD/SPD/RAB NRR/DE/ECGB OGC/HDS2 RES/DET/EMMEB NOAC COPIES LTTR ENCL 1
1 1
1 1,
1 1
0 1
1 1
1 NOTE TO ALL "RIDS" RECIPIENTS:
PLEASE HELP US TO REDUCE WASTE.
TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD)
ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED:
LTTR 14 ENCL 13
~
)
Commltnwrt. /nenstke, Eaergy.
Palo Verde Nuclear Generating Station WilliamE. Ide Vice President Nuclear Engineering TEL 602/3936116 FAX 602/3936077 Mail Station 7605 P.O. Box 52034 Phoenix, AZ85072-2034 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station P1-37 Washington, DC 20555-0001 102-04260-WEIAKK/MLG March 16, 1999
References:
1)
APS Letter 102-04060-JML/SAB/JRP, from James M. Levine to the NRC, "Inservice Testing (IST) Second 10 year Program",
dated January 13, 1998 2)
APS Letter 102-04212-JML/AKK/SAB/MLG,from James M. Levine to the
- NRC, "Revision to Pump and Valve Inservice Testing Program", dated November 23, 1998 3)
APS Letter 102-04222-WEI/AKK/MLG, from William E. Ide to the NRC, "Pump and Valve Inservice Testing Program Revised Relief Requests", dated December 10, 1998
Dear Sirs:
Subject:
Palo Verde Nuclear Generating Station (PVNGS)
Units 1, 2, and 3 Docket Nos. STN 60-528/529/630 Pump and Valve lnservice Testing Program Revised Relief Requests PRR-05, PRR-06, and PRR-11 On February 26, 1999, APS participated in a conference call with members of the NRC staff regarding the PVNGS Inservice Testing (IST) Program for the second 10-year interval (previously submitted by Reference 1). During the conference call, APS agreed to revise pump relief requests PRR-05, PRR-06, and PRR-11 to clarify that the proposed design flow testing for the LPSI, HPSI, and Containment Spray pumps will be performed using instruments that comply with Code requirements.
APS has completed these revisions and the revised relief requests are enclosed.
No commitments are being made to the NRC by this letter.
99032402i9 9903Kb
. V~
PDR ADQCK 05000528'iI'i P
~
~
Pump and Valve Inservice Testing Program Revised Relief Requests U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Page 2
~
Should you have any questions, please contact Scott A. Bauer of my staff at (602) 393-5978.
Sincerely, WEI/AKK/MLG/rlh Enclosure cc:
E. W. Merschoff M. B. Fields J. H. Moorman
I
ENCLOSURE Revised Relief Requests PRR-06, PRR-06, and PRR-11
Pump Relief Request No. 5 (PRR-05)
LPSI Pump Flow Rate Measurement Pump ID SIA-Po1 SIB-Pol Pump Description Low Pressure Safety Injection (LPSI) Pump Low Pressure Safety Injection (LPSI) Pump Code Class Drawing /
Coord.
SIP-001 / F I I SIP-001 / B I I Function LPSI pumps SIA-P01 and SIB-P01 provide low-pressure coolant injection of borated water into the reactor coolant system under accident conditions.
They also provide shutdown cooling flow post-accident and during normal reactor startup and shutdown.
Test Where system resistance cannot be varied, flow rate and pressure shall be Requirement determined and compared to their respective reference value.
(OM-6, Para. 5.2(c))
Alternate Testing LPSI pumps SIA-P01 and SIB-P01 willbe tested at mini-flowconditions during plant operation per OM-6 para. 5.2(c), but flow rate will not be measured.
SIA-P01 and SIB-P01 willbe tested at design flow on a Cold Shutdown frequency.
During design flow testing, th'e flow rate will be measured using instruments whose range and accuracy meet Code requirements, and the Code-required parameters will be measured and evaluated per OM-6 para. 5.2(d).
Basis for Relief During normal power operation, the LPSI pumps cannot develop sufficient discharge pressure to overcome RCS pressure and allow flow through the safety injection headers.
Thus, during quarterly testing, LPSI flow is routed through a minimum flow recirculation line to the refueling water tanks.
The minimum-flow recirculation flowpath is a
fixed resistance circuit containing a flow-limiting orifice capable of passing only a
small fraction of the design flow.
The installed flow instrumentation (permanently mounted ultrasonic flowmeter) has only limited capability, and its accuracy is not sufficient to meet OM-6 accuracy requirements.
A larger recirculation flowpath is available; however, it uses the same flow instrument as the minimum-recirculation line.
During cold shutdowns, the shutdown cooling flowpath is available for LPSI pump testing.
The shutdown cooling flowpath includes an orifice-type flow meter that complies with the range and accuracy requirements of OM-6 para. 4.6.1.1 and 4.6.1.2 respectively.
This flow meter will be used to measure flowduring the design flowtest.
The LPSI pumps are normally used to provide shutdown cooling flow during shutdown operations, and occasionally for recirculating the refueling water tank when the unit is at power.
Little degradation is expected during power operation.
- Thus, the alternate testing will adequately monitor these pumps to ensure continued operability and availability for accident mitigation.
Approval This reliefrequest complies with the requirements of Generic Letter S9-04 Position 9. No additional approval is required.
Note:
This relief was previously granted during the first 10-year IST interval per SER dated November 15, 19SS, TER section 3.2.3, PRR No.
6.
Pump Relief Request No. 6 (PRR-06)
HPSI Pump Flow Rate Measurement Pump ID SIA-P02 SIB-P02 Pump Description High Pressure Safety Injection (HPSI) Pump High Pressure Safety Injection (HPSI) Pump Code Class Drawing /
Coord.
SIP-001 / E11 SIP-001 / A11 Function Test Requirement Alternate Testing The HPSI pumps provide high-pressure coolant injection of borated water into the reactor coolant system under accident conditions.
They also provide flow for long-term cooling and flushing to prevent boron precipitation.
Where system resistance cannot be varied, flow rate and pressure shall be determined and compared to their respective reference value.
(OM-6, Para. 5.2(c))
HPSI pumps SIA-P02 and SIB-P02 willbe tested at mini-flowconditions during plant operation per OM-6 para. 5.2(c), but flow rate will not be measured.
SIA-P02 and SIB-P02 will be tested at design flow on a Refueling frequency.
During design flow testing, the flow rate will be measured using instruments whose range and accuracy meet Code requirements, and the Code-required parameters will be measured and evaluated per OM-6 para. 5.2(d).
Basis for Relief During normal power operation, the HPSI pumps cannot develop sufficient discharge pressure to overcome RCS pressure and allow flow through the safety injection headers.
Thus, during quarterly testing, HPSI flow is routed through a minimum flow recirculation line to the refueling water tanks.
The minimum-flow recirculation flowpath is a
fixed resistance circuit containing a flow-limiting orifice capable of passing only a
small fraction of the design flow.
The installed flow instrumentation (permanently mounted ultrasonic flowmeter) has only limited capability, and its accuracy is not sufficient to meet OM-6 accuracy requirements.
During cold shutdown conditions, full flow operation of the HPSI pumps to the RCS is restricted to preclude RCS pressure transients that could result in exceeding Technical Specification pressure-temperature limits (LTOP).
During refueling outages, the RCS injection flowpath is available for HPSI pump testing.
The RCS injection flowpath includes orifice-type flow meters that comply with the range and accuracy requirements of OM-6 para. 4.6.1.1 and 4.6.1.2 respectively.
These flow meters will be used to measure flowduring the design flowtest.
The HPSI pumps are standby pumps.
SIB-P02 is used only occasionally
~ %
0
Approval to recharge the safety injection tanks. Little degradation is expected during power operation.
- Thus, the alternate testing will adequately monitor these pumps to ensure continued operability and availability for accident mitigation.
This reliefrequest complies with the requirements of Generic Letter 89-04 Position 9. No additional approval is required.
Note:
This relief was previously granted during the first 10-year IST interval per SER dated November 15, 1988, TER section 3.2.3, PRR No.
6.
)
Pump Relief Request No. 11 (PRR-11)
Containment Spray Pump ?<low Rate Measurement Pump ID Pump Description Code Class Dra>ving /
Coord.
SIA-P03 SIB-P03 Containment Spray (CS) Pump Containment Spray (CS) Pump 2
SIP-001 / Hl 1 2
SIP-001 / C I 1 Function Test Requirement Alternate Testing Basis for Relief CS pumps SIA-P03 and SIB-P03 deliver borated water to the containment spray headers, providing containment cooling and pressure control during accident conditions.
The CS pumps can also be lined up to provide flow for shutdown cooling.
The full-scale range of each analog instrument shall be not greater than three times the reference value. (OM-6, para. 4.6.1.2(a))
Where system resistance cannot be varied, flowrate and pressure shall be determined and compared to their respective reference value.
(OM-6, para. 5.2(c))
CS pumps SIA-P03 and SIB-P03 will be tested at mini-flow conditions during plant operation per OM-6 para. 5.2(c), but flow rate will not be measured.
SIA-P03 and SIB-P03 willbe tested at design flow on a Cold Shutdown frequency. During design flow testing, the flow rate will be measured using instruments whose range and accuracy meet Code requirements, and the Code-required parameters will be measured and evaluated per OM-6 para. 5.2(d).
The containment spray pumps are single stage, vertical pumps normally lined up to the containment spray headers.
The "rumble range" of the
- pumps, where operation is unstable due to flow oscillations, is approximately 1800-2800 gpm.
Each CS pump has two possible recirculation flowpaths: a minimum-flow recirculation flowpath with a flow-limitingorifice capable ofpassing only a small fraction ofthe design flow, and a larger flowpath used mainly for RWT mixing.
All the flowpaths pass through the flowmeter just downstream of the CS pump discharge.
The recirculation flowpaths also pass through a common recirculation line flowmeter.
The CS pump discharge flowmeter is an orifice-type analog flowmeter with a range of 0-5000 gpm.
The common recirculation line flowmeter is a
permanently-mounted ultrasonic flowmeter which has only limited capability.
The accuracy of the ultrasonic flowmeter is not sufficient to meet OM-6 accuracy requirements or to be relied upon for determining pump operability.
The normal containment spray flowpath cannot be used for testing the CS pumps without spraying down the inside of the containment building and risking damage to important equipment. The RCS injection portion of the shutdown cooling flow path cannot be used for testing during power
C
)
Approval operation because the CS pumps are unable to develop sufficient discharge pressure to overcome RCS pressure.
The flow rate through the pump discharge flowmeter must be at least 1634 gpm to satisfy the full-scale range requirement of OM-6 para.
4.6.1.2(a).
The flow capacity of the minimum-flow recirculation line is well below 1634 gpm.
The larger recirculation flowpath is capable of carrying more than 1634 gpm, but routine surveillance testing at fiow rates above this value is not practical because of the pump rumble range (1800-2800 gpm).
Testing in or near the rumble range is not practical because of the potential for equipment damage.
Testing at flow rates above the rumble range
(> 2800 gpm) is not practical because flow velocities in the recirculation piping would exceed the design criteria.
During cold shutdowns, the shutdown cooling flowpath is available for CS pump testing.
At design flow, the CS pump discharge flowmeter meets the range requirements of OM-6 para. 4.6.1.1.
It also meets the accuracy requirements of OM-6 para. 4.6.1.2.
This flowmeter will be used to measure flowduring the design flowtest.
The CS pumps are standby pumps. Little degradation is expected during power operation.
The alternate testing will adequately monitor these pumps to ensure continued operability and availability for accident mitigation.
This reliefrequest complies with the requirements of Generic Letter S9-04 Position 9. No additional approval is required.
This relief request is similar to Pump Relief Request No. 6 previously approved during the first 10-year IST interval per SER dated November 15, 198S, TER section 3.2.3, except that design flow testing will be performed on a Cold Shutdown frequency rather than a Refueling frequency.
I
~4 t
a
't
'4
~
Vi ll I