ML20027B402

Forwards GE Program for Reactor Internals Vibration Measurement & Insp of BWR/6 Class Plants In,Response to NRC Request for Info in Item 2 of Table 1-3 of 251 & 238 NSSS Gessar Sers.Affidavit Encl

ML20027B402
Person / Time
Site:	Perry, 05000000, 05000531, 05000550, 05000551
Issue date:	04/24/1978
From:	Sherwood G GENERAL ELECTRIC CO.
To:	Case E Office of Nuclear Reactor Regulation
Shared Package
ML19289B220	List: ML20027B378 ML20027B402
References
JFQ-19-78, MFN-169-78, NUDOCS 8209200397
Download: ML20027B402 (9)

Text

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PROJECTS D I Vi s 10 h GENEFu:. ELECTRIC CCMPANY.175 CURTNER AVE., SAN JOSE, CAUFORNIA 96125 HC 682, (408) 925-5040 ,

MFN/169/78 April 24,1978 [7TACHMEF1 JFQ/19/78

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U. S. Nuclear Regulatory Comission Washington, DC 20555 Attention: Mr. Edson G. Case, Acting DireGor Office of Nuclear Reactor Regulation Docket Nos.: STN50-550,&Sb-531 Gentlemen:

SU3 JECT: REACTOR INTERNALS VIBRATION ASSURANCE PROGRAM The purpose of this letter is to respond to the Staff's request for additional technical information as documented by Item 2 on Table 1-3 of the 251 and 238 N555 GESSAR Safety Evaluation Reports.

Attached is General Electric's program for reactor internals vibration measurement and inspect. ion for BWR/6 Class plants. This program includes the vibration measuremen't and inspection program to be conducted during preoperational and initial startup testing for prototype and non-prototype plants in accordance with Regulatory Guide 1.20.

Also included is the specific identification of the designated prototype and non-prototype plants. Foreign plants are not included in the list with the exception of Cofrentes, which is a prototype of several domestic plants. -

If you have any questions or corr.ents concerning this program, please contact D. J. Robare of my staff at (403) 925-3304. _

Yery truly yo rs.

[ bec: S. W. Smith "

J. F. Quirk **

Glenn G. Sherwood, Manager

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D. J. Robare K "

Safety & Licencing Operation B')R y S&L Staff GG5:lw/63 E. W. O'Rorke Attache,ents

. J. F. O'Hara t, c, gope cc: W. F. Kane (NRC) R.J. Mattson (Ni L. S. Gifford R. S. Boyd (N) 8209200 y3

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Vibration measurement and inspection programs for BhW6 reactor internals.

Sumarv Reactor internals vibration measurement and inspection prograns will be implemented during preoperational and initial startup testing of prototype BhW6 plants in accordance with guidelines of Regulatory Guide 1.20. An inspection program will also be implemented in each non-prototype plant in accordance with the Regulatory Guide. The designated categories of BhW6 plants are as follows:

PIANT SIZE (Vessel inside diameter, inches:)

251 238 218 Grand Gulf-1 Perry-1 Cofrentes (Spain)

Prutotype Non-prototype, Grand Gulf-2 Perzy-2 River Bend 1 6 2 Category 1 Skagit-2 TVA X17-22 Clinton Black Fox 1 4 2 Allen's Creek-1 Non-prototype, Skagit-1 Category II The non-prototype plants listed above have internals design configurations which are substantially similar to those of the designated prototype plants in each vessel size category. Exceptions are the Skagit plants, which have more fuel assemblies and a higher recirculation flow rate than the designated prototype plant, Grand Gulf-1. Vibration measurements will be made in Skagit-1 in addition to the inspection program to evaluate these design differences.

Vibration measurement program _

Vibration measurements in prototype plants will be conducted in three phases:

(1) Preoperational tests prior to fuel loading. This test series is conducted with the reactor assembly complete except for fuel, control blades, and in-core instnnentation. Steady-state test conditions l

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f will include balanced (two-pmp) recirculation system operation and unbalanced (single-pump) operation, over the full range of flow rates up to rated flow, and at a temperature of approximately 400*F to 500*F. Transient flow conditions will include single and two-pump trips fmm rated flow. He specified test duration will be 35 hours4.050926e-4 days <br />0.00972 hours <br />5.787037e-5 weeks <br />1.33175e-5 months <br /> of balanced operation, plus 14 hours1.62037e-4 days <br />0.00389 hours <br />2.314815e-5 weeks <br />5.327e-6 months <br /> of single-pump operation of each recirculation loop, for a totag of 63 hours7.291667e-4 days <br />0.0175 hours <br />1.041667e-4 weeks <br />2.39715e-5 months <br />.

This will subject major components to a minimum of 10 cycles of vibration at the anticipated dominant response frequency and at the maximum response amplitudes. Vibration measurements will be obtained during this test and a close visual inspection of internals will be conducted before and after the test.

(2) Precritical testing with fuel. This vibration measurement series is conducted with the reactor assembly complete but prior to reactor startup. Flow conditions will include balanced, unbalanced, and transient recirculation system operation. The purpose of this series is to verify the anticipated effect of the fuel on the vibration response of internals. Previous vibration measurements in BhR's (Ref.1) have shown that precritical and preoperational test response amplitudes are similar.

(3) Initial startup testing. Vibration measurements will be made during reactor startup at conditions up to 100 percent rated flow and power. Balanced, unbalanced, and transient conditions of

• recirculation syst s operation will be evaluated on the 60% and 100%

load lines. He primary purpose of this test series is to verify the anticipated effect of two-phase flow on the vibration response of internals. Previous vibration measurements in BhUs (Ref.1) have shown that the effect of the two-phase flow is to broaden the frequency-response spectnnn and diminish the maximum response amplitude of the shroud, shroud head, and core support stmeture.s. R us, the first test series, (without fuel) is a conservative evaluation of the vibration IcVels of these stmctures. -

I, Ref. 1. NEDE-24057-P (Class III) and NEDO-24057 (Class I), " Assessment of Reactor Internals Vibration in BhR/4 and Bh7/5 Plants" November 1977. .

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Vibration sensor types will include strain gages, displacement sensors (linear variable differential transfomers), and accelerometers.

Accelerameters will be provided with double integration signal condition-ing to give a displacement output. Sensor locations will include the following:

Top of shmud head, lateral acceleration (displacement)

Top of shroud, lateral displacement Shroud at midplane, lateral acceleration (displacement)

Jet pump riser braces, bending and extension strains Jet pump diffuser, bending strain Control rod drive housings, bending strain In-core housings, bending strain Core spray intemal piping, bending strain In addition to the above components, vibration of the core spray sparger will Grand be Gulf-1.

measured during preoperational testing of the core spray system at The vibration measurement program for Skagit-1 will include sensors on the shroud and shroud head and on the jet pump riser braces and diffuser. No sensors will be provided on lower plenum components, because flow velocities in Skagit-1 are lower than those in Perry-1, and the designs of lower plenum components are similar in these plants.

Vibration nicasurements will be made in preoperational, precritical, and startup testing at the same conditions of flow and power specified for prototype plants.

In all vibration measurements ment will be recorded on magne, tic tape, and pmvision will be made fort selective on-line analysis to verify the overall quality and level of the data.

Interpretation of the data will require identification of the dominant vibration modes of each ccuponent by the test engineer, using frequency, .

phase, and amplitude infomation from the crnponent dynamic analyses.

Comparison of measured vibration amplitudes to predicted and allowable amplitudes will then be made on the basis of the analytically obtained nomal mode which best approximates the observed mode.

Inspection pmgram Visual inspections will be conducted prior to and following preoperational testing in all BhR/6 plants. The inspections are for the purpose of detecting evidence of vibration resulting from the specified 63 hour7.291667e-4 days <br />0.0175 hours <br />1.041667e-4 weeks <br />2.39715e-5 months <br /> test period in 'the e

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different flow modes. At the completion of preoperational testing, the reactor vessel head and shroud head will be removed, the vessel will be drained, and major components will be inspected for wear, cracking, loosening of bolts, failures, and the presence of debris and loose parts. Access will be provided to the reactor lower plenum for these inspections. Close visual inspection of the following components is required:

1. Core plate, shroud support ring, bottom head, and jet pump nozzles for evidence of debris and loose parts.

2. Lower plenum components and their respective welds, including all peripheral contml rod drive and in-core housings, peripheral in-core guide tubes and housings, stabilizer bars and connections, the liquid control and differential pressure lines and bracket welds, and the shmud support welds.

3. The jet pinp riser braces, cross bars, brackets, nozzle vanes, beams and beam bolts, wedges, locator screws, all keeper welds, and the instrument lines and brackets.

4. The hold-down nuts, keepers, and associated welds which attach the core plate to the shroud and the top guide to the shroud. .

5. The steam separator tie bar welds, outer rows of standpipes, stiffener bar welds, shroud head stud support ring brackets and supports, and " ' '

associated welds.

6. The feedwater spat Jer structure and end bracket attachments.

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7. The core spray lines, brackets, and core spray spargers.

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GENERAL ELECTRIC C0MPANY AFFIDAVIT I, Glenn G Sherwood, being duly sworn, depose and state as follows:

~ 1. I am Manager, Nuclear Safety and Licensing Operation, General Electric Company, and have been delegated the function of reviewing the information described in paragraph 2 which is sought to be withheld and have been authorized to apply for its withholding.

2. The information sought to be withheld consists of NEDE-22203, Reactor Internals Vibration Predictions.

3. In designating material as proprietary, General Electric utilizes the definition of proprietary information and trade secrets set forth in the American Law Institute's Restatement Of Torts, Section 757. This definition provides:

"A trade secret may consist of any formula, pattern, device or compilation of information which is used in one's business and which gives him an opportunity to obtain an advantage over competitors who do not know or use it.... A substantial element of secrecy must exist, so that, except by the use of improper means, there would be difficulty in acquiring informa-tion.... Some factors to be considered in determining whether given information is one's trade secret are: (1) the extent to which the information is known outside of his business; (2) the extent to which it is known by employees and others involved in his business; (3) the extent of measures taken by him to guard the secrecy of the information; (4) the value of the information to him and to his competitors; (5) the amount of effort or money expended by him in developing the information; (6) the ease or difficulty with which the information could be properly acquired or duplicated by others."

4. Some examples of categories of information which fit into the definition of proprietary information are:

a. Information that discloses a process, method or apparatus where prevention of its use by General Electric's competitors without license from General Electric constitutes a competi-tive economic advantage over other companies;

b. Information consisting of supporting data and analyses, includ-ing test data, relative to a process, method or apparatus, the application of which provide a competitive economic advantage, e.g., by optimization or improved marketability;

c. Information which if used by a competitor, would reduce his expenditure of resources or improve his competitive position in the design, manufacture, shipment, installation, assurance of quality or licensing of a similar product;

d. Information which reveals cost or price information, produc-tion capacities, budget levels or commercial strategies of General Electric, its customers or suppliers;

e. Information which reveals aspects of past, present or future General Electric customer-funded development plans and programs of potential commercial value to General Electric;

f. Information which discloses patentable subject matter for which it may be desirable to obtain patent protection;

g. Information which General Electric must treat as proprietary according to agreements with other parties.

5. In addition to proprietary treatment given to material meeting the standards enumerated above, General Electric customarily maintains in confidence preliminary and draft material which has not been subject to complete proprietary, technical and editorial review.

This practice is based on the fact that draft documents often do not appropriately reflect all aspects of a problem, may contain tentative conclusions and may contain errors that can be corrected during normal review and approval procedures. Also, until the final document is completed it may not be possible to make any definitive determination as to its proprietary nature. General Electric is not generally willing to release such a Locument to the general public in such a preliminary form. Such documents are, however, on occasion furnished to the NRC staff on a confidential basis because it is General Electric's belief that it is in the public interest for the staff to be promptly furnished with signifi-cant or potentially significant information. Furnishing the docu-ment on a confidential basis pending completion of General Electric's internal review permits early acquaintance of the staff with the information while protecting General Electric's potential proprie-tary position and permitting General Electric to insure the public documents are technically accurate and correct.

6. Initial approval of proprietary treatment of a document is made by the Subsection Manager of the originating component, the man most likely to be acquainted with the value and sensitivity of the information in relation to industry knowledge. Access to such documents within the Company is limited on a "need to know" basis and such documents at all times are clearly identified as proprietary.

7. The procedure for approval of external release of such a document is reviewed by the Section Manager, Project Manager, Principal Scientist or other equivalent authority, by the Section Manager of the cognizant Marketing function (or his delegate) and by the Legal Operation for technical content, competitive effect and deter-mination of the accuracy of the proprietary designation in accord-ance with the standards enumerated above. Disclosures outside General Electric are generally limited to regulatory bodies, customers and potential customers and their agents, suppliers and licensees only in accordance with appropriate regulatory provisions or proprietary agreements.

8. The document mentioned in paragraph 2 above has been evaluated in accordance with the above criteria and procedures and has been found to contain information which is proprietary and which is customarily held in confidence by General Electric.

9. Public disclosure of the information sought to be withheld is likely to cause substantial harm to the c~ompetitive position of t5a General Electric Company and deprive or reduce the availability of profit-making opportunities for the following reasons:

A. The cost of developing the proprietary information in the document mentioned in paragraph 2 above has been estimated to be $1,000,000. These costs include data acquisition, reduction, and interpretation and sensor manufacturing and installation.

B. This information would greatly reduce expenditure by a competitors attempting to develop a similar program.

C. The competitors likely to gain from disclosure of this information are Babock-Wilcox, Westinghouse, Asea Atom, Combustion-Engineering, etc.

D. Competitors in the consulting business currently lack the capability and experience which GE has developed in their vibration program. Revealing this information would cause GE to lose its current competitive advantage.

E. The information sought to be withheld is not asoilable in public sources.

Glenn G. Sherwood, being duly sworn, deposes and says that he has read the foregoing affidavit and the matters stated therein are true and correct to the best of his knowledge, information, and belief.

Executed at San Jose, California, this 9 day of September , 1982_.

>AV '

~Glenn G. 'Sfiemood' ' ' '

General Electric Company STATE OF CALIFORNIA COUNTY OF SANTA CLARA

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Subscribed and sworn before me this a day of September 1982 OFF 17L S A . 8d/

g KAREN S. VOGELHUBER g NOTARY PUBUC-CAL!f0RNIA .#0fARYPUBLICINANDf0RSAID k g COUNTY AND STATE SANTA CLARA COUNTY

$ My Commission Expires Dec bacosacocososocososo. 21,1984soconocb im/9H 9/9/82

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