ML17298C133
| ML17298C133 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 05/05/1985 |
| From: | Licitra E Office of Nuclear Reactor Regulation |
| To: | Knighton G Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8505200053 | |
| Download: ML17298C133 (12) | |
Text
Docket Nos.:
50-528, 50-529 and 50-530 MEMORANDUM FOR:
George W. Knighton, Chief Licensing Branch No.
3 Division of Licensing FROM:
SUBJECT:
E. A. Licitra, Project Manager Licensing Branch No.
3 Division of Licensing FORTHCOMING MEETING WITH ARIZONA PUBLIC SERVICE COMPANY ON PALO VERDE DATE E( TIME:
LOCATION:
PURPOSE'.
- Friday, May 10, 1985 8:30 am Room P-114 Phil 1 i ps Building
- Bethesda, Maryland To discuss spray pond piping weld corrosion evaluation (enclosed agenda lists questions to be discussed).
PARTICIPANTS:
APS W. guinn, et al.
Bechtel S. Sheppard, et al.
NRC J. Wermiel, D. Katze, R. Gonzales, W. Hazelton, W. J. Collins, R. Zimmerman, E. A. Licitra, P.
Wu
Enclosure:
Meeting Agenda E. A. Licitra, Project Manager Licensing Branch No.
3 Division of Licensing cc:
See next page DL:LB03 EALicitra7 t 7WKn ghton 8505200053 850505 I
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i' Palo Verde Mr. E.
E.
Van Brunt, Jr.
Executive President Arizona Nuclear Power Pro'ject P. 0.
Box 52034 Phoenix, Arizona 85072-2034 Arthur C. Gehr, Esq.'nell 5 Wilmer 3100 Valley Center Phoenix, Arizona 85073 Mr. James M. Flenner, Chief Counsel Arizona Corporation Commission 1200 West Washington Phoenix, Arizona 85007 Charles R. Kocher, Esq. Assistant Counsel James A. Boeletto, Esq.
Southern California Edison Company P. 0.
Box 800
- Rosemead, Cali fornia 91770 Ms. Margaret Walker Deputy Director of Energy Programs Economic Planning and Development Office 1700 West Washington Phoenix, Arizona 85007 Mr. Wayne Shirley Assistant Attorney General Bataan Memorial Building Santa Fe, New Mexico 87503 Mr. Roy Zimmerman U.S. Nuclear Regulatory Commission P. 0.
Box 239 Arlington, Arizona 85322 Ms. Patricia Lee Hourihan 6413 S. 26th Street Phoenix, Arizona 85040 Regional Administrator - Region V
U. S. Nuclear Regulatory Commission 1450 Maria Lane Suite 210 Walnut Creek, California 94596 Kenneth Berlin, Esq.
Winston 5 Strawn Suite 500 2550 M Street, NW Washington, DC 20037 Ms. Lynne Bernabei Government Accountability Project of the Institute for Policy Studies 1901 gue Street, NW Washington, DC 20009 Ms. Jill Morrison 522 E. Colgate Tempi, Arizona 85238 Mr. Charles B. Brinkman, Manager Washington Nuclear Operations Combustion Engineering, Inc.
7910 Woodmont Avenue Suite 1310
- Bethesda, Maryland 20814 Mr. Ron Rayner P. 0.
Box 1509
- Goodyear, AZ 85338
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Hydrologic Engineering guestions Palo Verde Essential Spray Pond Corrosion You state that a cross sectional bypass flow area of 11.5 in~ is equivalent to a bypass flow of approximately 800 gpm.
How was this relationship.,'between area and flow reduction determined?
How was the pressure drop of 0.1 psig per nozzle used in your analysis?
How does this relate to a 5 percent flow reduction of 800 gpm?
You state that removing nozzles one-at-a-time and measuring pressure drop established a relationship between the pressure drop and an increase in bypass flow area.
What is this relationship?
What is the relationship between water flowing out of a nozzle arm (with the nozzle removed) and water flowing out a small hole in a submerged pipe?
You state that "...testing successfully established that system pressure drop can be used to detect and quantify an increase in through-wall pitting (i.e. increased by-pass flow area)."
That this can be done is not evident from the information you provided.
Discuss how pressure drop can be used to detect and quantify an increase in by-pass flow area.
Since a portion of the 16,000 gpm flowing through the system would leak out through the pitted pipes, a smaller flow at a lower pressure would be available to be sprayed through the 320 nozzles.
Thus the cooling efficiency would be affected.
Also, the hot water leaking out into the pond would result in higher temperatures in the water being pumped from the spray pond to the heat exchangers.
Discuss how reduced nozzle efficiency and higher water temperatures were considered in your analysis since you used prior computer runs to evaluate the impact of flow reduction on cooling pond temperature.
What is the relationship between loss of flow and increase in pond water temperature?
You assumed that spray pond heat transfer is directly proportional to spray flow rate.
Provide the basis for this assumption.
It is not clear to the staff that this is a valid assumption.
Can the design pressure be maintained in the system even with leaking pipes?
What is the design pressure of the system?
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PALO VERDE NUCLEAR GENERATING STATION UNITS 1, 2 AND 3 REQUEST FOR ADDITIONAL INFORMATION REGARDING ULTIMATE HEAT SINK CONCERNS AUXILIARYSYSTEMS~~,.
1.
A limiting criteria for the ultimate heat sink (essential spray pond) is the essential spray pond system flow.
An indirect test method was developed by ANPP in their letter dated April 3, 1985.
It's purpose was to determine when the bypass area (pipe leakage) has increased to the point (5X bypass flow) where system performance will not meet design requirements.
FSAR Figure 9.2-1 for the essential spray pond system indicates two instruments for measuring flow in each essential spray pump train.
They are FI-5 (FIT-7) and FI-6 (FIT-8).
The licensee should elaborate on why these instruments are not used to determine bypass flow.
The licensee's response should include a discussion of the accuracy of the existing flow indicators (FI-5 and FIT-7) as opposed to that for the instrumentation utilized in their proposed indirect monitoring method per the licensee's letter of April 3, 1985.
2.
With increased bypass flow, the essential spray pond system flow resistance will decrease.
Depending upon the essential spray pond pump head/flow characteristics, system total flow may increase.
We are concerned that proper pump performance at this increased flow can be maintained with regard to adequate available net positive suction head (NPSH) and/or pump submergence.
Confirm that bypass flow up to the maximum allowable (5%)
will not affect essential spray pond pump performance.
3.
Given that the licensee has identified no corrective action for the currently identified leakage in the spray pond piping, and, that the licensee is relying on the proposed leakage monitoring program to assure ultimate heat sink performance (safety function) within design limits, it is our position that the licensee propose technical specification revisions with appropriate surveillance, limiting conditions for operation, and action statements to assure spray pond operability.
These technical specifications should be in place prior to receipt of a full power license for Palo Verde Unit 1.
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Chemical En ineerin questions What is the chemistry of the water in the pond?
Provide more detail on the scenario and the mechanism for the corrosion process.
What kind of biocide is being used, what is its chemical composition, and what effect will it have on other materials in the system?
Discuss the microstructural characterization of the piping welds.
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CAY 5 >s8y MEETING NOTICE DISTRIBUTION:
NRC PARTICIPANTS J.
Wermiel D. Katze R: Gonzales D. Sellers W. J. Collins R.
Zimmerman E.
A. Licitra P.
Wu bcc:
Applicant 5 Service List
-Docket=No(s):
5O-- 52'/529/53O NRC PDR Local PDR TIC NSIC PRC System LB3 Reading H.. Denton/D. Eisenhut H. Thompson/F.
Miraglia T. Novak J.
Youngblood A. Schwencer E..Adensam E. Butcher D. Crutchfield C. Grimes, G.'Holahan C.
Thomas G. Lainas S.
Varga D. Vassallo J. Miller J. Stolz F.
Rowsome W. Johnston J.
P. Knight, Acting Dir.,
DE R. Bernero R. Bonsak, Acting, AD/CSE, DE L. Rubenstein W. Houston D. Muller T. Speis F. Schroeder W. T. Russell, Acting Dir., DHFS ACRS (16)
- Attorney, OELD J. Partlow B. Grimes E. L. Jordan F. Ingram, PA Receptionist (Only if meeting is held in Bethesda)
Project Manager J.
Lee
0 P
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