ML20003G678
| ML20003G678 | |
| Person / Time | |
|---|---|
| Site: | Allens Creek File:Houston Lighting and Power Company icon.png |
| Issue date: | 04/20/1981 |
| From: | Rorde S EBASCO SERVICES, INC. |
| To: | |
| Shared Package | |
| ML20003G672 | List: |
| References | |
| NUDOCS 8104300485 | |
| Download: ML20003G678 (8) | |
Text
1 i11ir 4-20-81 0
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UNITED STATES OF AMERICA O
3 ggg N'JCLEAR REGULATORY COMMISSION 2
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-1 BEFORE THE ATOMIC SAFETY AND LICENSING BOARD g$$
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4 In the Matter of
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4 6
)
5 HOUSTON LIGHTING & POWER COMPANY)
Docket No. 50-466
)
6 (Allens Creek Nuclear Generating)
Station, Unit No. 1)
)
7
)
8 9
DIRECT TESTIMONY OF SANAT KORDE ON TEXPIRG ADDITIONAL CONTENTION #26 10 ON COMPUTER CODE ERROR 11 0
Please state your name and position.
12 A.
My name is Sanat Korde.
I am a Senior Supervising 13-Engineer for Ebasco Services, Inc.
14 0
Please state your educational background and work 15 experience.
16 A.
A statement of my qualifications is provided as Exhibit 17 SK-1.
18 Q.
What is the purpose of your testimony?
19 A.
This testimony responds to Additional Contention No.
20 26 of Texas Public Interest Research Group (TexPirg).
21 TexPirg contends that the computer program used to calculate 22 the stresses on the reactor and containment dur ng the f
l 23 design basis and safe shutdown earthquakes is defective 24 because it subtracts forces when they should be added.
25 Q.
What is the computer program which is the subject 26 of the TexPirg contention?
27 A.
TexPirg through its representative, Clarence Johnson, 28 has indicated in deposition (6/5/80, pages 11-14) that this l
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contention is solely based upon computational techniques 3
found in computer codes of five nuclear power plants just 4
prior to the Three Mile Island event.
Specifically, these 5
plants were Beaver valley-1, Surry 1 and 2, Maine Yankee, 6
and James A. FitzPatrick.
The problem identified was in 7
the algebra of a pipe stress computer program subroutine 8
named SHOCK II developed by Stone & Webster, the architect-9 engineer for the above named plants.
10 Q.
Describe the problem that was found in this computer 11 code-12 A.
In evaluating piping systems which are subject to 13 dynamic loading conditions such as seismic events, one of 14 the most common methods used to calculate stress levels in 15 piping or reaction loads on supports (i.e., Responses) is 16 the so called " Response Spectrum Method."
According to this 17 method, the " Responses" are calculated for each natural mode 18 of the piping and then these individual " Responses" are 19 combined for all other contributing codes to obtain the 20 total resultant solution.
These " Responses" (from individual 21 modes) should not be algebraically added because of the l
22 possibility of the predicted responses in the negative 23 direction offsetting predicted responses in the positive 24 direction.
Rather, these responses should be combined 25 absolutely or, as is the case in newer codes, using techniques I'
26 such as the square root of the s'm of the squares.
This u
27 conforms to the current industry practice.
28 The SHOCK II Computer Code was combining these responses l
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- 1 in algebraic summation which was not in accordance with 2
3 current industry practice.
This was discovered when the results of SHOCK II were compared to a newer code.
4 Does the design analysis for Allens Creek use the SHOCK 5
Q.
6 II subroutine?
For Allens Creek the equivalent code to SHOCK II 7
A.
No.
8 is a program developed by Ebasco called PIPESTRESS 2010.
What assurance exists that similar algebaric errors are 9
Q.
10 not present in the PIPESTRESS 2010 code?
In order to assure that similar computational techniques 11 A.
12 do not occur in Allens Creek, the PIPESTRESS.2010 computer 13 program has been compared with solutions to sample problems 14 run on independently written programs such as PIPSED and to 15 solutions generated by hand calculation.
This comparison 16 shows that PIPESTRESS 2010 results are virtually identical 17 to results generated by the above programs and hand calcula-These checks assure that loads are properly combined 18 tions.
19 s so that the computer problem discussed in this testimony 20 will not occur.
What are your conclusions regarding this contention?
21 Q.
22 A.
In summary, TexPirg is concerned that the program 23 used for calculating piping stress for Allens Creek im-24 properly combine loads.
The assurance that PIPESTRESS 2010 25 properly combines loads comes from the fact that this 26 program has been tested through comparison with results of 27 other independently produced programs and hand calculations.
if PIPESTRESS 2010 program had used algebraic summation 28
- Hence,
1
-4_
2 for modal combination as the SHOCK II program did, discre-
.3 pancies would have been noted, just as they were when the 4
results of SHOCK II were compared to an independently generated Therefore, the SHOCK II computer code problem will Si Program.
6 not occur in using PIPESTRESS 2010 for Allens Creek.
7 8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 i
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b SANAT W. KORDE 1
EDUCATION AND PROFESSIONAL QUALIFICATIONS g
Exhibit SWK-1 g
EXPERIENCE
SUMMARY
4 f
5 Registered Professional. Engineer with over sixteen years
]
6 experience, as an administrator and,a technical supervisor in mechanical engineering for the des lgn of large comunercial 7
8 nuclear and fossil. power plants and process plants.
i Progressive responsibility-in mechancial engineering in 9
10 design criteria development, production, scheduling, budgets, f,
i 11 manpower-forecasting and resource llocation for piping systems 12 analyses, pipe rupture, system evaluation functions and develop-i 13 ment activities.
l 14 Responsible, at present, for lirecting Applied Mechanics 15 Development Group which includes the following functions:.
16 (1) Design Procedures & Criteria Development; (2) Computer l
17 Programs Development; (3) Pipe Rupture Analysis Development 18
& Project Support;. (4) Computer Programs Commercialization.
i 19 Responsibilities include both technical, such as supervising, 20 reviewing and approving technical work as well as general 1
L 21 administration of the group.
22 Also worked as a Supervising Engineer on many nuclear l
23 and fossil power plant projects, prior to being promoted as 24 a Sr. Supervisor ~for the Development Group.
In this capacity, l
25 was responsible for directing a team of engineers to provide i
26 effective technical support from Applied Mechanics Department, l
27 for the successful completion of the projects.
28 Record of making significant contribution in the I
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I development of technical design criteria for projects, con-2 sidering both the codes and regulatory requirements, specif-3 ically related to piping systems analyses.
Experienced in 4
preparing safety analysis reports, project specifications.
5 Participated in company level task forces to study, special 6
engineering problems having interdepartmental interface, 7
procedures, new technical requirements.
Participated also 8
on code committee task forces.
9 EMPLOYMENT HISTORY 10 Ebasco Services Incorporated, New York, 1973 - Present:
11 Sr. Supervising Engineer (Since January, 1981); Supervising 12 Engineer (1979 - 1981); Principal Engineer (1976 - 1979);
13 Senior Engineer (1974 - 1976); Engineer (1973 - 1974).
14 C. F. Braun & Co., Murray Hill, N.J.,
1972 - 1973:
15 Sr. Design Engineer.
16 Foster Wheeler Corporation, Livingston, N.J.,
1968 - 1972:
17 Sr. Design Engineer.
18 University of Massachusetts, Amherst, Mass., 1968 - 1968:
19 Graduate Student & Research Assistant.
20 Dastur & Co., Bombay, 1965 - 1967:
Design Engineer.
21 EDUCATION 22 I.I.T.,
Bombay, B.S.
- 1965.
23 University of Massachusetts, Amherst, M.S.
- 1968.
24 REGISTRATIONS 25 Professional Engineer, New Jersey.
26 PROFESSIONAL AFFILIATIONS 27 ASME - Special Working Group on Dynamic Analysis.
28 L
3E UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION BEFORE THE ATOMIC SAFETY AND LICENSING BOARD 4
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In the Matter of
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HOUSTON LIGHTING & POWER COMPANY
)
Docket No. 50-466,
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)
(Allens Creek Nuclear Generating
)
Station, Unit 1)
)
)
CERTIFICATE OF SERVICE I hereby certify that copies of Applicant's testimony on Intervenor Doherty's contentions 3 (fuel specific enthalpy),
39 (fuel swelling), 20 (a) (gap conductance), 7.(LPCI cold slug), 9 (containment buckling) and 27 (reactor pedestal) and on Intervenor TexPirg's contentions 6 (McCorkle Centen-tion XI) (aircraft hazards) and additional 26 (computer code error) in the above-captioned proceeding were saried on the following persons by deposit in the United States mail postage prepaid or hand delivery, this 20th day of April, 1981:
Sheldon J. Wolfe, Esq., Chairman Susan Plettman Esq.
Atomic Safety and Licensing David Preister, Esq.
Board Panel Texas Attorney General's Office U.S. Nuclear Regulatory Commission P. O. Box 12548 Washington, DC 20555 Capitol Station Austin, Texas 78711 Dr. E. Leonard Cheatum Route 3, Box 350A Hon. Charles J. Dusek Watkinsville, Georgia 30677 Mayor, City of Wallis P. O. Box 312 Mr. Gustave A. Linenberger Wallis, Texas 77485 Atomic Safety and Licensing Board Panel Hon. Leroy H. Grebe U.S. Nuclear Regulatory Commission County Judge, Austin County Washington, DC 20555 P. O. Box 99 Bellville, Texas 77418 Chase R. Stephens l
Docketing and Service Section Office of the Secretary of Atomic Safety and Licensing Board Panel the Commission U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission Washington, DC 20555 Washington, DC 20555 Atomic Safety and Licensing Appeal Board U.S. Nuclear Regula.ory Commission Washington, DC 20$55 w
James M. Scott, Jr.
Richard Black, Esq.
13935 Ivy Mount U.S. Nuclear Regulatory Sugar Land, Texas 77478 Commission Washington, DC 20555 William Schuessler 5810 Darnell John F. Doherty Houston, Texas 77074 4327 Alconbury Street Houston, Texas 77021 Stephen A. Doggett, Esq.
P. O. Box 592 Rosenberg, Texas 77471 Att:
Clarence Johnson Bryan L. Baker Executive Director 1923 Hawthorne Box 237 U.S.
Houston, Texas 77098 University of Houston Houston, Texas 7704 J. Morgan Bishop Margaret Bishop Carro Hinderstein 11418 Oak Spring 609 Fannin Street Houston, Texas 77043 Suite 521 Houston, Texas 77002 W. Matthew Perrenod 4070 Merrick D. Marrack Houston, Texas 77024 420 Mulberry Lane Bellaire, Texas 77401 Brenda McCorkle 6140 Darnell Houston, Texas 77074 F. H. Potthoff, III 1814 Pine Village Houston, Texas 77080 Wayne E.
Rentfro P. O. Box 1335 Rosenberg, Texas 77471 Y-I e
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