ML20150D919
| ML20150D919 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 03/17/1988 |
| From: | Malloy M NRC OFFICE OF SPECIAL PROJECTS |
| To: | NRC OFFICE OF SPECIAL PROJECTS |
| References | |
| NUDOCS 8803250217 | |
| Download: ML20150D919 (4) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION eq j
WASHING TON, D. C. 20555 g.
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March 17, 1988
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Docket Nos. 50-445 and 50-446 APPLICANT:
Texas Utilities Electric Company (TV Electric)
FACILITY:
Comanche Peak Steam Electric Station (CPSES),
Units 1 and 2
SUBJECT:
SUMMARY
OF MEETING ON FEBRUARY 5, 1988 -
DEVELOPMENT AND ATTENUATION OF JETS FROM HIGH-ENERGY LINE BREAKS On February 5,1988 NRC staff met with representatives of TV Electric, lead applicant for the CPSES, in NRC's Rockville, MD offices to discuss NRC coments on the Ebasco Services, Incorporated (Ebasco) jet attenuation calculation, CPE-SI-CA-0000-645. The meeting notice (with NRC's coments as enclosure) and a list of attendees are provided as Enclosures _1 and 2, respectively, to this sumary.
During the NRC inspection of Ebasco's Systems Interaction Program for CPSES, the team reviewed Ebasco calculation CPE-SI-CA-0000-645 Revision 0 for jet attenuation from high-energy line breaks. NRC Inspection Report 50-445/87-37; 50-446/87-28 dated February 8, 1988 raised several technical issues concerning misinterpretations of terms and limitations in the theory being used to calculate jet attenuation.
For example, Ebasco uses a method which is applicable to gaseous jets and can be used for steam and water jets if the quality beyond the asymptotic plane is greater than 90%. However, Ebasco uses this method without any rastriction on the quality of the jet fluid.
During the meeting, TV Electric comitted to provide NRC with justification for the attenuation factors employed in the analysis of single-phase steam jets and two-phase flashing water jets.
By letter dated February 18, 1988 (TXX-88227), TU Electric informed NRC that they are performing analyses to demonstrate that the attenuation factors being utilized for CPSES are conservative (Enclosure 3). The results of these analyses were expected to be available during the week of February 22, 1988 for NRC review.
TV Electric subsequently revised this time frame to late March 1988. The staff has scheduled a follow-up meeting for March 21, 1988 to discuss the results of these analyses with TV Electric represe tives.
f Melinda Malloy, Project M ger Comanche Peak Project Div fon Office of Special Projects Encio.Jres:
1.
Meeting Notice 2.
List of Attendees 3.
TXX-88227 dtd 2/18/88 8803250217 e80317 PDR ADOCK 05000445 A
PDR cc: See next page
r March 17, 1988 Sumary of 2/5/88 meeting DISTRIBUTION k
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Comanche Peak Steam Electric Station W. G. Counsil Texas Utilities Electric Company Units 1 and 2 cc:
Jack R. Newman, Esq.
Asst. Director for inspec. Programs Newman & Holtzingsr, P.C.
Comanche Peak Project Division U.S. Nuclear Regulatory Comission Suite 100 1615 L Street, N.W.
P. O. Box 1029 Washington, D.C. 20036 Granbury, Texas 76048 Robert A. Wooldridge, Esq.
Regional Administrator, Region IV Worsham, Forsythe, Sampels &
U.S. Nuclear Regulatory Comission Wooldridge 611 Ryan Plaza Drive, Suite 1000 2001 Bryan Tower, Suite 2500 Arlington, Texas 76011 Dallas, Texas 75201 Lanny A. Sinkin Mr. Hcmer C. Schmidt Christic Institute Director of Nuclear Services 1324 North Capitol Street Texas Utilities Electric Company Washington, D.C.
20002 Skyway Tower 400 North Olive Street, L.B. 81 Ms. Billie Pirner Garde. Esq.
Dallas, Texas 75201 Government Accountability Project Midwest Office Mr. Robert E. Ballard, Jr.
104 East Wisconsin Avenue Director of Projects Appleton, Wisconsin 54911 Gibbs and Hill, Inc.
11 Penn Plaza New York, New York 10001 David R. Pigott, Esq.
Orrick, Herrington & Sutcliffe 600 Montg aery Street Mr. R. S. Howard San Francisco, California 94111 Westinghouse Electric Corporation P. O. Box 355 Anthony Z. Roisman, Esq.
Pittsburgh, Pennsylvania 15230 Suite 600 1401 New York Avenue, NW Renea Hicks, Esq.
Washington, D.C. 20005 Assistant Attorney General Environraental Protection Division Robert Jablon P. O. Box 12548, Capitol Station Bonnie S. Blair Austin, Texas 78711 Spiegel & McDiamid 1350 New York Avenue, NW Mrs. Juanita Ellis, President Washington, D.C. 20005-4798 Citizens Association for Sound Energy 1426 South Polk George A. Parker, Chairman Dallas, Texas 75224 Public Utility Comittee Senior Citizens Alliance Of Ms. Nancy H. Williams Tarrant County, Inc.
CYGNA Energy Services 6040 Wonder Drive 2121 N. California Blvd., Suite 390 Fort Worth, Texas 76133 Walnut Creek, CA 94596 1
W. G. Counsil Comanche Peak Electric station Texas Utilities Electric Company Units 1 and 2
- CC' Joseph F. Fulbright Fulbright & Jaworski 1301 McKinney Street Houston, Texas 77010 Roger D. Walker Manager, Nuclear Licensing Texas Utilities Electric Company Skyway Tower 400 North Olive Street, L.B. 81 Dallas, Texas 75201 Mr. Jack Redding c/o Bethesda Licensing Texas Utilities Electric Company 3 Metro Center, Suite 610 Bethesda, Maryland 20814 William A. Burchette, Esq.
Counsel for Tex-La Electric Cooperative of Texas Heron, Burchette, Ruckert & Rothwell Suite 700 1025 Thomas Jefferson Street, NW Washington, D.C.
20007 GDS ASSOCIATES, INC.
Suite 720 1850 Parkway Place Marietta, Georgia 30067-8237 Administrative Judge Peter Bloch U.S. Nuclear Regulatory Commission Washington, D.C.
20555 Elizabeth B. Johnson Administrative Judge Oak Ridge National Laboratory P. O. Box X, Building 3500 Oak Ridge, Tennessee 37830 Dr. Kenneth A. McCollom 1107 West Knapp Stillwater, Oklahoma 74075 Dr. Walter H. Jordan 881 West Outer Drive Oak Ridge, TN 37830
EllCLOSURc 1 c,
f UNITED STATES f,
NUCLEAR REGULATORY COMMISSION u
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January 27, 1988 Reissued on Feb. 2, 1988 with Docket Nos* 50-445 NRC cornents on jet atten-and 50-446 uation calculation (CPE-SI-CA-0000-645) to be HEMORANDUM FOR:
Christopher I. Grimes Director Comanche Peak Project Division Office of Special Projects THRU:
James H. Wilson, Assistant Dir s
for Projects Comanche Peak Project Division Office of Special Projects FROM:
Melinda Malloy, Project Manager Comanche Peak Project Division Office of Special Projects
SUBJECT:
FORTHCOM!flG MEETING WITH TV ELECTRIC Date & Time:
Friday, February 5, 1988 1:00 pm Location:
One White Flint North 11555 Rockville Pike Room 16-B-11 Rockville, MD 20852
Purpose:
For Apolicant to discuss develonment and attenuation of jets from high-energy line breaks Participants *:
NRC Aeolicant O.
Norkin D. West J.
Lyons R. Walker, et al.
P.
T. Kuo a
)'
,l(ka e /d g J. Wilson
"- " * " Y
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Melinda Malloy, Proj4cf Manager
Enclosure:
ilRC cornents Comanche Peak Project'Oivision on calculation Office of Special Projects
- Meetings between NRC technical staff and applicants for licenses are open for interested members of the oublic, petitioners, intervenors, or other parties to attend as observers pur:uant to "Ocen Meetings and Statement of NRC Staff Policy," 43 Federal Register, 28058, 6/28/78.
CONTACTS:
Netinda Malloy or James H. Wilson (301)492-0738 (301)492-3306 cc:
See next page
ENCLOSURE
,~
COMMENTS ON CALCULATION CPE-SI-CA-0000-645 The procedure for evaluating the attenuation of jets resulting from high energy line ruptures given in the subj ect document has been reviewed.
Our comments are as follows:
1.
The document under revies claims (Pg. 2) that Ref. I does not addrass the attenuation of the jet. Wa believe that Ref erence 1 does address the atten-uation (d the jet; although it does not appear as an explicit coefficient.
Any attempt to develop an additional attenuation coefficient is inappropri-ate.
2.
The procedure uses a method recommended by Reference 1 based on je'. axial velocity, pressurs and t empe ra tu re profiles developed in Reference 2 ins tead of using' Eq. D-2 and D-3 as prescribed in Reference 1.
- However, thie method is applicable to gaseous jets and can be used for steam water mixture jets, if the quality beyond the asymptotic plane is greater than 90%. The subject document, however, uses this approach without any restric-tion on the quality of the jet fluid.
Actually, the lower quality mixture behaves very dif f erently f rom perf ect gas, and because of the relatively higher density of the two phase fluid, the jet will attenuate at a signi-ficantly slower rate compared to the gaseous jets. This suggests that the method used in the document is not conservative for low-quality jets.
In most cases of flashing water jets (both for primary and secondary coolant systems), the quality of the jet fluid is significantly lower than 90%.
The assumption that water substantially separates out before the asymptotic plane resulting in a high quality steam beyond that plane cannot be justi-fied.
3.
The postulation (en page 13) that the force that the jet can impart to a 2
target is proportional to p + Sn/ /2 is not correct. The tapingement f orce should be proportional to (P p).
Where P is the local stagnation pressure and p is the local static pressure and they are related by the following expression:
Y T-J Y-1 2 )(
P=
p 1+
M 2
Where M is the local Mach number, it is to be noted that beyo a the asymptotic plane, local static pressure (p) remains constant and is equal to the pressure surrounding the jet.
4 In a free jet the total momentum of the jet beyond asymptotic plane remains I
constant along the axis of the jet. As the jet entrains more and more of the ambient fluid, its velocity and temperature profiles become flatter.
But if the ta'rget is large enough to intercept the entire jet, the impingement force does not drop even though the stagnation pressure at the jet axis has decayed substantially.
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The document under review interprets Figure 0.7 in Ref erence 1 as a plot of variation of local static pressure with distance.
It is actually a plot of (p - p)/p, vs. dis tance, uhere p is the exit plane pressure of the jet.
This figure is the same as Figure 5 of Reference 2.
It is to be noted that (P - p) is measured at the jet centerline.
The incorrect use of this figure in the document under review has led to the conclusic., that there is an additional attenuation factor.
It is suggested that Ref. 2 be consulted in case further clarification is needed.
J The work done by the jet fluid on the surrounding and the exchange of mole-cular kinetic energy do not result in any reduction of somentum of the entire jet including the entrained fluid, and any attenuation ef fect result-ing from the work done by the jet and energy exchange cannot be justified.
5.
Figure 6 of Reference 2 represerts the decay of temperature dif f erence ratio (A Ta/ 6Te).
The subject document uses this figure inappropriately as temperature, ratio (T*) on Page 11.
The error due to this might be significant for the range of temperature of interest.
6.
The document determines the attenuation factor " g " in comeshat.arbitra'ry fashion.
First, it claims tnat this factor should follow the decay of P*, and then, since the decay of P* is excessive, it considers the decay of V* as the acceptable attenuation.
Since this factor has been applied to the impingement f orce on a carget using Reference 1, the credit due to the attenuation of jet has been double-counted.
REFERENCES:
1.
"Design Basis for Protection of Light Water Nuclear Power Plante Against Effects of Postulated Pipe Rupture," ANSI /ANS 58.2-1980.
2.
Anderson, A. R. and Johns, F.
R.,
"Characteristics of Free Supersonic Jets Exhausting into Quiescent Air," Jet Propulsion, January 1955.
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ENCLOSURE 2 NRC/TU Electric Meeting on Development and Attenuation of Jets February 5, 1988 ATTENDEES Name Affiliation D. Norkin OSP/CPPD J. H. Wilson OSP/CPPD J. E. Lyons OSP/CPPD D. A. West TU Electric R. G.
eo Ebasco V. Iniagarajan Ebasco R. D. Walker TV Electric R. Dacko TU Electric D. Lowrie TU Electric K. X. Niyogi NRC consultant (United Engineers.& Constructors)
G. H. Weidenhamer RES/DE S. Traiforos NRC Consultant G. Tuday NRC Consultant (United Engineers & Constructors)
R. C. Iotti Ebasco J. Moore OGC S. Hou NRR i
ENCLOSURE 3
.Y Log # TXX-88227
==
File # 10010 P9 903.6 Ref # 10CFR50.30(a) 1UELECTRIC February 18, 1988 William G. Counsil Executuve Vwe hrsdent U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555
SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) 00CKETS NOS. 50-445 AND 50-446 JET IMPINGEMENT ANALYSES Gentlemen:
During the February 5, 1988 meeting with the NRC concerning CPSES jet impingement analyses, TV Electric committed to provide the NRC with justification for the attenuation factors employed in the analysis of single phase steam jets and two phase flashing water jets.
TV Electric is performing analyses to demonstrate that the attenuation factors presently being utilized at CPSES are conservative.
These analyses are being performed as follows:
1.
For single phase jets (i.e., jets with a quality greater than ninety percent) the attenuation factors contained in CPSES calculation CPE-SI-CA-0000-645 will be demonstrated to be conservative with respect to attenuation factors derived using the methodology presented in American National Standard ANSI /ANS 58.2, "Design Basis for Protection of Light Water Nuclear Power Plants Against Effects of Pipe Rupture".
2.
For two phase flashing water jets, an analysis of CPSES specific lines will be performed to demonstrate that the attenuation factors contained in CPSES calculation CPE-SI-CA-0000-645 are conservative with respect to attenuation factors derived using the methodology presented in NUREG/CR-2913, "Two Phase Jet Loads"_
Preliminary results of these analyses will be available during the week of February 22, for your review.
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,_.r TXX-88227 February 18, 1983 Page 2 of 2
'We are confident that above analyses will demonstrate that the attenuation factors used at CPSES for single phase and two phase jets are justified.
Very truly yours, f
i W. G. Counsil BSD/amb c - Mr. R. D. Martin, Region IV Resident Inspectors, CPSES (3) d 1
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