ML051940466
| ML051940466 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 09/17/2004 |
| From: | Berger W, Hammersley R, Henry R Fauske & Associates |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| FAI/04-65, Rev 0 | |
| Download: ML051940466 (35) | |
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FAI/04-65, Revision 0 Test Report for Phase I of Experimental Investigation of Post "RAS Air Intrusion into ECCS Suction Piping for Palo Verde Nuclear Generating Station REDACTED VERSION
?ROPRTARY FAI/04-65 Page I of 34 REDACTED VERSION Rev. 0 Date: 09/17/04 FAUSKE & ASSOCIATES, INC.
CALCULATION NOTE COVER SHEET SECTION TO BE COMPLETED BY AUTHOR(S):
Calc-Note Number FAI/04-65 Revision Number 0 Title Test Report for Phase I of Experimental Investitation of Post RAS Air Intrusion Into ECCS Suction Piping for Palo Verde Nuclear Gleneratino StatiOn Project Number or Project Arizona Public Service (APS) Shop Order APS003
Purpose:
This report documents the scaled experiments that were conducted to investigate a past plant operability question regarding the possibility of any of the air initially residing in the horizontal segment of the sump suction line being swept into the vertical downcomer and subsequently into the ECCS pumps. The nature of the two phase flow pattern produced in the vertical segment was also investigated.
Results Summary: A range of containment overpressure and system flow rates were investigated. The set of conditions that would be expected for a large break LOCA event were found to result in the air being relocated from the horizontal segment into the vertical segment. The two-phase flow pattern in the vertical segment was seen to be liquid continuous with dispersed air bubbles.
References of Resulting reports, Letters, or Memoranda (Optional)
Author(s): Completion Name (Print or Type) Signature Date R. J. Hammerslev September 17. 2004 SECTION TO BE COMPLETED BY VERIFIER(S):
Verifier(s): Completion Name (Print or Type) Signature Date W. E. Bereer September 24. 2004 Independent Review or Method of Verification: Design Review . Alternate Calculations X , Testing Other (specify)
SECTION TO BE COMPLETED BY MANAGER:
Responsible Manager. Approval Name (Print or Type) Signature Date R. E. Henry V a September 24.2004
PROPRETAR REDACTED VERSION .r . FAI/04-65 Page2of34 Rev. 0 Date: 09/11/04 CALC NOTE NUMBER FAI/04-65 PAGE 2 CALCULATION NOTE METHODOLOGY CHECKLIST CHECKLIST TO BE COMPLETED BY AUTHOR(S) (CIRCLE APPROPRIATE RESPONSE)
- 1. Is the subject and/or the purpose of the design analysis clearly stated?.................................................................................. c....
................. NO
- 2. Are the required inputs and their sources provided? ....... ........ ....... NO N/A
- 3. Are the assumptions clearly identified and justified? .............. ....................; ;;. NO N/A
- 4. Are the methods and units clearly identified? ............. .NO (. N/A
- 5. Have the limits of applicability been identified? ;:: NO 3 N/A
.No.....................
(Is the analysis for a 3 or 4 loop plant or for a single application.)
- 6. Are the results of literature searches, if conducted, or other background data provided?; . NO N/A
- 7. Are all the pages sequentially numbered and identified by the calculation note number?..N.................................................... .......... NO
- 8. Is the project or shop order clearly identified?9 .. ;
3............................ NO
- 9. Has the required computer calculation infonnation been provided? ........
9
............. YES NOCE
- 10. Were the computer codes used under configuration control? .............................. YES NO (C )
II. Was the computer code(s) used applicable for modelin'j the physical and/or computational problems identified? ........................... ; : YES NO (2 (i.e., Is the correct computer code being used for the intended purpose.)
- 12. Are the results and conclusions clearly stated?............................................... NO
- 13. Are Open Items properly identified . .................................................. YES NO
- 14. Were approved Design Control practices followed without exception? ............. YES NO (Approved Design Control practices refers to guidance documents within Nuclear Services that state how the work is to be performed, such as how to perform a LOCA analysis.)
- 15. Have all related contract requirements been met? ..................................... ......... NO N/A NOTE: If NO to any of the above, Page Number containing justification -
PROPRIETAVR FAI104-65 Page 3 of 34 REDACTED VERSION Rev. 0 Date: 09/17104 FAI/04-65 Test Reportfor Phase 1 ofExperimentalInvestigation of Post RAS Air Intrusion Into ECCS Suction PipingforPalo Verde Nuclear GeneratingStation PreparedFor:
Palo Verde Nuclear GeneratingStation Arizona PublicService PreparedBy:
Fauske & Associates, LLC 16WY070 West 83rd Street BurrRidge, Illinois 60527 TEL: (630) 323-8750 FAX: (630) 986-5481 September, 2004
-PROPRIETARY~
REDACTED VERSION: -J3} FAI/04-65 Page 4 of 34 Rev. 0 Date: 09/17/04 ABSTRA CT This report documents the scaled experiments that w6re conducted to investigate a past plant operability question regarding the possibility of any of the air initially residing in the horizontal segment of the sump suction line being swept into the vertical downcomer and subsequently into the ECCS pumps. The nature of the two phase flow pattern produced in the vertical segment was also investigated.
A range of containment overpressure and system flow rates were investigated. The set of conditions that would be expected for a large break LOCA event were found to result in the airbeing relocated from the horizontal segment into the vertical segment. The two-phase flow pattern in the vertical segment was seen to be liquid continuous with dispersed air bubbles.
PROPRIETARYSION FAI/04-65 Page 5 of 34 REDACTED VERSIO Rev. 0 Date: 09/17104 PURPOSE The purpose of this report is to document the Phase I test conditions and results for the APS experimental investigation of the post RAS air intrusion into ECCS suction piping.
REA VERSION ,'m.'. FAI/04-65 Page 6 of 34 Rev. 0 Date: 09/17/04 INPUT DATA AND ASSUMPTIONS The Phase 1 experiments were configured and conducted per the approved test plan (FAI, 2004). The initial conditions, major components, and key dimensions for these tests are described in the test plan.
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PROPRIETFARY-REDACTED VERSION FAI104-65 Page 7of 34 Rev. 0 Date: 09117104 TABLE OF CONTENTS Page CALCULATION NOTE COVER SHEET ....................................... I CALCULATION NOTE METHODOLOGY CHECKLIST ........................................... 2 TITLE PAGE .......................................... 3 ABSTRACT.................................................................................................................................. 4 PURPOSE .......................................... 5 INPUT DATA AND ASSUMPTIONS .......................................... 6 TABLE OF CONTENTS .......................................... 7 LIST OF FIGURES .......................................... 9 LIST OF TABLES .......................................... 10 1.0 PHASE 1 TEST OBJECTIVES .11 1.1 Technical Issue .11 1.2 Experimental Objectives..................................................................................... 11 2.0 PHASE I TEST FACILITY .13 2.1 Physical Arrangement .13 2.2 Instrum entation................................................................................................... 15 2.3 Scaling Considerations........................................................................................ 17 3.0 PHASE I TEST MATRIX AND TESTING OBSERVATIONS .21 3.1 Initial Conditions and Test Matrix .21 3.2 Observations During Phase I Testing .21 4.0 PHASE I TEST RESULTS .25 4.1 Key Observations .25 4.2 Discussion of Results .25
5.0 CONCLUSION
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REDACTED V ION + FAI/04-65 Page 8 of34 Rev. 0 Date: 09/17/04
6.0 REFERENCES
............................ 34 APPENDIX A: Phase I Test Data . . . A-I
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RED CTEDETRSIONFAI/04-65 REDACTED VERSION .Rev. Page 9of 34 0 Date: 09/17/04 LIST OFFIGURES Page Figure I Phase 1 test configuration for post RAS air intrusion......................................... 14 Figure 2 Two-phase flow patterns reported by [ ] for vertical downflow .................. 19 Figure 3A Total flow rate (Tests 1-4) .................. 29 Figure 3B Total flow rate (Tests 5-8) .................. 30 Figure 3C Total flow rate (Tests 9-12) .................. 31
,. PROPRIETARY'F FAI/04-65 Page 1O of 34 REDACTED VERSION ., Rev. 0 Date: 09117/04
- LIST OF TABLES -
Page Table I Instrumentation for Phase I Test .......... ............................. :...... 16 Table 2 Phase I TestMatrix ............................. 22
- . . . 1 Table 3 'Phase 1 Test Results and Observations . ........................................... 26 Table 4 [ .. ] ; 32 I, - .
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1 OPRtEAR FAI/04-65 Page 11of 34 REDACTED VERSION- Rev. 0 Date: 09/17/04
- 1. 0 PHASE 1 TEST OBJECTIVES 1.1 Technical Issue The Palo Verde Nuclear Generating Station (PVNGS) has identified a concern that their sump recirculation flow paths to the Emergency Core Cooling System (ECCS) pumps contain a pocket of air trapped between the sump isolation Motor Operated Valves (MOVs) and check valve that could potentially be forced into the operating pump suction upon an initiation of a Recirculation Actuation Signal (RAS) during a design basis event. PVNGS has requested analysis of this concern to determine:
(1) If any volume of air between the inboard sump isolation valve and the downstream check valve could be forced into the suction of the operating High Pressure Safety Injection (HPSI) and Containment Spray (CS) pumps upon full opening of the sump isolation valves at the time of RAS.
(2) The impact on pump performance if any amount of air from the sump suction piping is injected into the operating pumps.
1.2 Experimental Obiectives An experimental investigation has been initiated to address this technical issue and investigate the two-phase flow patterns for the scaled horizontal and downward vertical flow segments. The objective of the Phase I testing was to investigate the potential for the air initially resident in the horizontal sump suction line to be forced into the vertical downward piping section.
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FA1104-65 Page 12 of 34 PROPRI ETAR" Rev. 0 Date: 09/17/04 REDACTED VERSION;
] The Phase I tests were configured and performed in accordance to the approved test plan (FAI, 2004).
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FAI/04-65 Page 13 of 34 REDACTED ON Rev. 0 Date: 09117/04 2.0 PHASE 1 TEST FACILITY 2.1 Phvsical Arrangement The test facility that was used for the Phase I testing was composed of [
], a centrifugal pump, piping, valves, and associated instrumentation as indicated in Figure
- 1. The piping and valves used to establish and visualize the flow pattern development from the initial location between the valves and into the downcomer piping were all 4 inch in diameter. The horizontal segment [
I The vertical [
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FAI/04-65 Page 14 of 34 Rev. 0 Date: 09/17/04 REDACTED VERSION U
Mil Figure 1 Phase 1 test configuration for post RAS air intrusion.
FAI/04-65 Page 15 of 34 PROPRIETARY Rev. 0 Date: 09/17/04 REDACTED VERSION E
2.2 Instrumentation I
The test instrumentation is indicated in Figure 1 and listed in Table 1. A personal computer (PC) [ ] was used to collect data during [
]. Each data channel was sampled at a rate of [ ] The data that was recorded for each test included:
[ ] General observations [ ] were made and noted by the test engineers.
These observations were used to characterize the [ I
RPROPVRS FAI/04-65 Page 16 of 34 REDACTED'VERSION, Rev. 0 Date: 09/17/04 Table 1 U U U U Following the first four tests in the test matrix the test data was reduced and plotted. The results were inspected for internal consistency as well as confirmation of the proper functioning of the instrumentation. The data collected on instrument P4 appeared to be contaminated with excessive noise. [
] Thus, in addition to relocating the P4 pressure transducer it was reoriented such that instead of being at the
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M yGpRp FAI/04-65 Page 17 of 34 REDACTED VERSION Rev. 0 Date: 09/17/04 2.3 Scalinz Considerations I
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REDACTED VERSION FAI/04-65 Page 19 of 34 Rev. 0 Date: 09/17/04
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',REDACTED VERSION Rev. 0 Date: 09117/04
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REDAC ED VESIONFAIIO4-65 Page 21 of 34 REDACTED VERSION Rev. 0 Date: 09117/04 3.0 PHASE I TEST MA TRIXAND TESTING OBSER VA TIONS 3.1 Initial Conditions and Test Matrix The initial conditions were as follows:
Relative to the elevation of the center line of the horizontal segment of the pump suction line.
The test matrix as provided in the approved Test Plan was modified based on observations during the Phase I tests by the Westinghouse project team and the APS representatives [
] who were observing the tests. The revised test matrix executed in the Phase I testing is provided in Table 2. The key observations for each test included [
3.2 Observations During Phase 1 Testing During the execution of the Phase 1 test matrix several general observations were made in addition to the key object [ ]
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REDACTED VERSION FA1/04-65 Page 23 of 34 Rev. 0 Date: 09/17/04 1U
PROPRIETARY 11 REDACTED VERSION FA1104-65 Page 24 of 34 Rev. 0 Date: 09/17/04 I . I . - ,-.cI .I 1, U
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REDACTED REDA VERSION TEDVERIONRev. FAI/04-65 Page 09/17/04 0 Date: 25 of 34 4.0 PHASE 1 TESTRESULTS 4.1 Key Observations The key observations for the Phase I air intrusion test relate to the specific test objectives.
The objectives are to observe the behavior of the air in the initially voided horizontal segment and the nature of the flow pattern produced in the vertical downcomer segment. The observations for the, 12 tests performed in the Phase I testing regarding these objectives are as follows:
- the air initially resident in the voided horizontal segment is removed from the horizontal segment during the initial transient phase,
- the two-phase flow pattern produced in the vertical segment is found to be liquid continuous with the air dispersed as a bubbly flow.
4.2 Discussion of Results The test data [ Ifor each of the twelve Phase I tests were reviewed. Table 3 summarizes the results of this review. Table 3 includes [
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PROEWTE RS REDACTED VERSION FAI/04-65 Page 27 of 34 Rev. 0 Date: 09/17104
1, . I REDACTED VERSION FAI/04-65 Page 28 of 34 Rev. 0 Date: 09117/04 a
FAJ/04-65 Page 29 of 34 REDACTED VERSION Rev. 0 Date: 09/17104 Figure 3A: Total flow rate (Tests 1-4).
FAT/04-65 Page 30 of 34
-.. . . REDACTED VERSION Rev. 0 Date: 09117/04 Figure 3B: Total flow rate (Tests 5-8).
- O w n FAI/04-65 Page 31 of 34 REDACTED VERSION Rev.0 Date: 09/17/04 Figure 3C: Total flow rate (Tests 9-12).
REDACTED VERSION FAI/04-65 Page 32 of 34 Rev. 0 Date: 09/17/04 Table 4
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.REDACTED VERSION FAI/04-65 Page 33 of 34 Rev. 0 Date: 09/17/04
5.0 CONCLUSION
S The Phase I tests results lead to the conclusion that the air void initially contained in the horizontal sump suction piping can be swept down and through the vertical piping in the suction line.
R DPRIOW FAII04-65 Page 34 of 34 REDACTED VERSION Rev. 0 Date: 09117/04
6.0 REFERENCES
FAI, 2004, FATI04-61, "Test Plan for Experimental Investigation of Post RAS Air Intrusion Into ECCS Suction Piping for Palo Verde Nuclear Generating Station," September.