ML19305B921
| ML19305B921 | |
| Person / Time | |
|---|---|
| Site: | Maine Yankee |
| Issue date: | 03/19/1980 |
| From: | Johnson W Maine Yankee |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| DMY-80-52, NUDOCS 8003200638 | |
| Download: ML19305B921 (40) | |
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ENGINEERING OFFICE WESTBORO. MASS ACHUSETTS 01581 g ~, 7 i e"j 617-366-9011
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B.3.2.1 March 19,1980 KMY 80-52 United States Nuclear Regulatory Commission Washington, D. C.
20555 Attention:
Office of Nuclear Reactor Regulation Mr. Darrell G. Eisenhut, Acting Director Division of Operating Reactors
Reference:
(a) License No. DPR-36 (Docket 50-309)
(b) USNRC Letter to MYAPC dated February 25, 1980 (c) Westinghouse Steam Turbine Division letter, dated March 14,1980 from J. Schmerling, W to D. Eisenhut, NRC
Subject:
Low Pressure Turbine Disc Integrity
Dear Sir:
Enclosed are:
1.
One (1) copy - responses to Reference (b) requesting information on turbine disc integrity, including one (1) copy - Application for Withholding and one (1) copy - Affidavit AW 7 2.
One (1) copy - Appendix A (proprietary) - Responses to Question 1-d 3.
One (1) copy - Appendix B (non-proprietary) - Responses to Question 1-d In response to Reference (b), Maine Yankee has performed a complete UT inspection of the keyway and disc bore areas of both lo" pre sure turbine rotors. This inspection was completed during the recent refueling shutdown.
The inspection showed that no detectable cracking exists in the turbine discs. The resul ts of the inspection are summarized in the response to site specific general question II in Attachment A.
A determination has been made that the rotors are suitable for satisfactory operation until the next inspection period which is discussed in our response to question V in Attachment A.
0\\[6 The site specific responses requested in Enclosure 2 of Reference (b) are provided in Attachment A.
These responses contain proprietary information of the Westinghouse Electric Corporation.
In conformance with the requirements 5
10 CFR 2.790 INFORMATION 63P g#.
Withhold Attachment g oo3 20o @
From Public Disclosure
/ 5 '"
'o United States Nuclear Regulatory Commission March 19,1980 Office of Nuclear Reactor Regulation Page 2 of 10CFR Section 2.790, as amended, of the Commission's regulations, we are enclosing with the submittal an application for withholding from public disclosure and an affidavit.
The af fidavit sets forth the basis on which the information may be withheld from public disclosure by the Commission.
The responses to the generic questions of Enclosure 2 have been coordinated through a Task Force whose representation includes all owners of Westinghouse nuclear low pressure turbines and is chaired by Mr. Wayne Stiede of Commonweal th Edison.
The consensus responses to the generic questions have been submitted to you by Westinghouse at the request of the task force.
These responses are contained in Reference (c).
Correspondence with respect to the affidavit or application for withholding should reference AW-80-7 and should be addressed to Mr. R. Williamson, Manager, Customer Order Engineering, Westinghouse Electric Corporation, Steam Turbine Divisions Lester Branch, Box 9175, Philadel phia, PA 19113.
We trust this information is satisfactory, however, should you have any questions, please contact us.
Very trul y yours,
MAINE YANKEE ATOMIC POWER COMPANY W.
Johnson Vice President COMMONWEALTH OF MASSACHUSETTS)
)ss COUNTY OF WORCESTER
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Then personally appeared before me, W. P. Johnson, who, being duly sworn, did state that he is a Vice President of Maine Yankee Atomic Power Company, that he is duly authorized to execute and file the foregoing request in the name and on the behal f of Maine Yankee Atomic Power Company, and that the statements therein are true to the best of his knowledge and belief.
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Ro'bert H. Gro'ce Notary Public
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ATTACHMENT A SITE SPECIFIC GENERAL QUESTIONS 1.
Provide the following information for
.ch LP turbine:
A.
Turbine type The Maine Yankee Atomic Power Company, Bailey Point #1 unit consists of one tandem compound four flow, three casings, condensing,1800 RPM turbine utilizing 44 in. last row blades in each low pressure element.
The low pressure elemer,t is designated as a Building Block 81.
B.
Number of hours of operation for each LP turbine at time of last turbine inspection or if not inspected, postulated to inspection.
49,782 hours0.00905 days <br />0.217 hours <br />0.00129 weeks <br />2.97551e-4 months <br /> as of 1/11/80 C.
Number of turbine trips and overspeeds turbine trips - 35 above 20% power
- 46 below 20% power overspeeds
-1 20% overspeed (factory test)
- 711% overspeed (trip system tests)
D.
For each disc:
1.
Type of material including material specifications.
2.
Tensile properties data.
3.
Toughness properties data including Fracture Appearance Transition Temperature and upper energy and temperature..
4 Keyway temperatures.
5.
Calculated keyway crack size for turbine time specified in 'B' above.
6.
Critical crack size.
7.
Ratio of calculated crack to critical crack size.
8.
Crack growth rate.
9.
Calculated bore and keyway stress at operating design overspeed.
data.
10.
Calculated Kte 11.
Minimum yield strength specified for each disc.
See Appendix A.
- l II.
Provide details of the resul ts of any completed inservice inspection of LP turbine rotors, including areas examined, since issuance of an operating license.
For each indication detected, provide detail s of the location of the crack, its orientation, and size.
The Maine Yankee Atomic Power, Bailey Pt. #1 had a Westinghouse field inspection team at the job site from 1/21/80 to 1/28/80 to ul trasonic inspect the keyways and disc bores of the LP rotors.
The rotors inspected were #1 LP-TD51350 and #2 LP-TD50659.
The inspection method employed was to ul trasonic1y inspect all keyways on Disc 1 thru 5 both ends on each rotor.
Al so, an ul trasonic 360 scan was made on the inlet and outlet side of each disc.
The inspection results are as follows:
The depth was not de te rminabl e.
There were no other indications on this rotor.
- 2 LP No indications.
III.
Provide the nominal water chemistry conditions for each LP turbine and d* scribe any condenser inleakages or other significant changes in secondary water chemistry to this point in its operating life.
Discuss the occurrence of cracks in any given turbine as related to history of secondary water chemistry in the unit.
The nominal water chemistry conditions are shown in Table 1.
The history of water chemistry at Maine Yankee has been exceptional.
The plant has operated entirely on all volatile chemistry utilizing tight controls on condenser inleakage.
As soon as chloride inleakage is detected, the condenser is isolated and repairs made.
Only twice in the plant's early history has significant chloride inleakage resul ted:
in each case mechanical failures of condenser tubes resu'.ted in chloride levels exceeding 100 ppm.
Both times the plant was immediately shut down and repairs made.
The plant presently operates with a continuous feed of hydrazine (2-5 ppb) and morpholine (1 ppb) and a continuous blowdown of 10-15 gpm.
IV.
If your plant has not been inspected, describe your proposed schedule and approach to ensure that turbine cracking does not exist in your turbine.
Not appliable since the Maine Yankee unit has been inspected and no cracks were found.
V.
If your plant has been inspected and plans to return or has returned to power with cracks, provide your proposed schedule for the next turbine inspection and the basis for this inspection schedule.
'l The next inspection of the low pressure turbine discs is not required for 44 operating months.
This is based on the following assumptions: (1) the existence of an undetectable crack 60 mils in depth, and (2) a ratio of the calculated crack size to critical crack size equal to 1 for the number two disc which is limiting.
The number one disc runs dry, therefore the crack growth rate for this disc equals zero.
A new spare rotor is on order and is scheduled for installation during the next refueling shutdown.
This replacement is being made because of blade modifications to L-2 and L-3 blading.
After repair of the removed rotor, the second LP turbine will be replaced.
Inspections of the new rotor will not be made until the in-service period reaches five years which is in accordance with present Westinghouse recommendations.
VI.
Indicate whether an analysis and evaluation regarding turbine missiles have been performed for your plant and provided to the staf f.
If such an analysis and evaluation has been performed and reported, please provide appropriate references to the available documentation.
In the event that such studies have not been made, consideration should be given to scheduling -such an action.
A turbine missile analysis has not been performed for Maine Yankee.
Westinghouse is presently calculating missile probabilities and energies for the BB81 turbines and expects to have results for us during September,1960. At that time, a decision will be made as to the need for further studies and the schedules for them.
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TABLE 1 i
Nominal-Water Chemistry Conditions pH 8.7 - 9.3 Cation Conductivity 1.2 - 3.2 mho/cm Dissolved Oxygen 5 ppb l
Hydrazine Trace Ammonia Silica.
20 ppb.
Iron 100 ppb Chl oride
. 0) ppm Free Hydroxide None i
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AW-80-7
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-.r March 14, 1980 Darrell G.
7nhut Division a
<4 rating Reactors c
Of fice of Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington DC 20555 APPLICATION FOR WITHHOLDING PROPRIETARY INFORMATION FROM PUBLIC DISCLGSURE
Subject:
Maine Yankee Atomic Power Station Docket #50-309 Information in Response to NRC Request for Information of February 25, 1980,- Relative to Low Pressure' Turbine Disc Integrity.
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Reference:
Appendix A letter from W. P. Johnson to Eisenhut, dated 3/19/80
Dear Mr. Eisenhut:
This application for withholding is submitted by Westinghouse Electric Corporation (" Westinghouse") pursuant to the provisions of paragraph (b)(1) of Section 2.790 of the Commission's regulations. Withholding from public disclosure is requested with respect to the subject infonnation which is further identified in the af fidavit accompanying this application.
The undersigned has reviewed the information sought to be withheld and is authorized to apply for its withholding on behalf of Westinghouse, STG-TOD.
The ~ affidavit accompanying this application sets forth the basis on which the information may be withheld from public disclosure by the Commission and addresses with specificity the considerations listed in paragraph (b)(4) of Section 2.790 of the Commission's regulations.
Accordingly, it is respectfully requested that the subject information which is proprietary to Westinghouse and which is further identified in the affi-davit be withheld from public disclosure in accordance with 10CER Section 2.790 of the Commission's regulations.
' Correspondence with respect to this application for withholding or the accom-panying af fidavit should be addressed to the undersigned.
Very truly yours,
-[ (v 2-Williamson, Manager Customer Order Engineering Westinghouse Electric Corporation l
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R f: AW-80-7
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AFFIDAVIT COMMONWEALTH OF PENNSYLVANIA COUNTY OF DELAWARE:
Before me, the undersigned authority, personally appeared Robert Williamson, who, being by me duly sworn according to law, deposes and says that he is authorized to execute this Affidavit on behalf of Westinghcuse Electric Corporation (" Westinghouse") and that the averments of fact set forth in this Affidavit are true and correct to the best of his knowledge, information, and belief:
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Robert Williamson, Manager Customer Order Engineering tAGG !) N $?*,ritsj gccre T:t ka3. 3..}.....C 3'/
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HENRY E.' SQUILLACE '
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ger Commtwon E2puu Oct. 18. 1980
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(1) I am Manager, Customer Order Engineering in the Steam Turbine Generator Technical Operations Division of Westinghouse Electric Corporation and as such, I have been specifically delegated the function of reviewing the proprietary information sought to be withheld from public disclosure in connection with nuclear power plant licensing, and am authorized to apply for its withholding on behalf of the Westinghouse Power Generation Divisions.
(2) I am making this Affidavit in conformance with the provisions of 10 CFR Sec', ion 2 790 of the Commission's regulations and in conjunction with the Westinghouse application for withholding accompanying this Affidavit.
(3) I have personal knowledge of the criteria and procedures utilized by Westinghcuse Power Generation Divisions in designating informa-tion as a trade secret, privileged or as confidential commercial or financial information.
(4) Pursuant to the provisions of paragraph (b)(4) of Section 2.790 of the Commission's regulations, the following is furnished for con-sideration by the Commission in determining whether the information sought to be withheld from public disclosure should be withheld.
(1)
The information sought to be withheld from public disclosure is owned and has been held in confidence by Westinghouse.
(ii)
The information is of a type customarily held in confidence by Westinghouse and not customarily disclosed to the pub-lic. Westinghouse has a rational basis for determining the types of information customarily held in confidence by it and, in that connection, utilizes a system to determine when and whether to hold certain types of information in confi-dance. The application of that system and the substance of that system constitutes Westinghouse policy and provides the rational basis required.
I.
Under that cystem, information is held in confidence if it falls in one or more of several types, the release of which might result in the loss of an existing or potential com-petitive advantage, as follows:
(a) The information reveals the distinguishing aspects of a process (or component, structure, tool, method, etc.)
where prevention of its use by any of Westinghouse's competitors without license from Westinghouse consti-tutes a competitive economic advantage over other companies.
(b)
It consists of supporting data, including test data, relative to a process (or component, structure, tool, method, etc.), the application of which data secures a competitive economic advantage, e.g.,
by optimization er improved marketability.
(c) Its use 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 a similar product.
(d)
It reveals cost or price information, production capac-ities, budget levels, or commercial strategies of West-inghouse, its customers or suppliers.
(e)
It reveals aspects of past, present, or future Westing-hous= or customer funded development plans and programs of potential commercial value to Westinghouse.
(f)
It contains patentable ideas, for which patent protec-tion may be desirable.
(g)
It is not the property of Westinghouse, but must be treated as proprietary by Westinghouse according to agreements with the owner.
(h)
Public disclosure of this information would allow un-fair' and untruthful judgments on the performance and reliability of Westinghouse equipment components and improper comparison with similar components made by competitors.
There are sound policy reasons behind the Westinghouse system which include the following:
(a) The use of such information by Westinghouse gives West-inghouse a competitive advantage over its competitors.
It is, therefore, withheld from disclosure to protect the Westinghouse competitive position.
(b)
It is information which is marketable in many ways.
The extent to which such information is available to competitors diminishes the Westinghouse ability to sell products and services involving the use of the information.
(c)
Use by our competitor would put Westinghouse at a ecm-petitive disadvantage by reducing his expenditure of resources at our expense.
(d)
Each component of proprietary information pertinent to a particular ccmpetitive advantage is potentially as valuable as the total competitive advantage. If ccm-petitors acquire components of proprietary information, any one component may be the key to the entire pu :le, thereby depriving Westinghouse of a competitive advantage.
(e)
Unrestricted disclosure would jeopardize the position of prominence of Westinghouse in the world market, and thereby give a market advantage to the competition in those countries.
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( f) The Westinghouse capacity to' invest corporate assets in research and development depenas upon the success in obtaining and maintaining a competitive advantage.
('iii) The information is being transmitted to the Commission in confidence and, under the provisions of 10 CFR Sec-tion 2 790, it is to be received in confidence by the Commission.
(iv)
The information is not available in public sources to the best of our knowledge and belief.
(v)
The proprietary information sought to be withheld in this submittal is that which is appropriately marked in Appen-dix A to letter from W. P. Johnson to Eisenhut, dated March 19, 1980 concerning infor-mation in response to NRC request for information of February 25, 1980, relative to low pressure turbine disc integrity.
The information enables Westinghouse to:
(a) Develop test inputs and procedures to satisfactorily verify the design of Westinghouse supplied equipment.
(b) Assist its customers to obtain licenses.
Further, the information has substantial commercial value as follows.
(a). Westinghouse can sell the use of this information to Customers.
(b) Westinghouse uses the information to verify the design of equipment which is sold to customers.
J 1
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-(c)
Westinghouse can sell services based upon the exper-ience gained and the test equipment and methods developed.
Public disclosure of this information is likely to cause substantial harm to the. competitive position of Westinghouse because it would enhance the ability of competitors to design, manufacture, verify, and sell electrical equipment for commercial turbine-generators without commensurate expenses. Also, public disclosure of the information would enable others having the same or similar equipment to use the information to meet NRC requirements for licensing documentation without purchasing the right to use the information.
The development of the equipment described in part by the information is the result of many years of development by Westinghouse and the expenditure of a considerable sum of money.
This could only be duplicated by a competitor if he were to invest similar sams of money and provided he had the appro-priate talent available and could somehow obtain the requi-site experience.
Further the deponent sayeth not.
4 0 4 s
APPENDIX B i
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1
Notes on Antwers to Site Specific Question ID 1.
Type of material is Ni-Cr-Mo-V all oy steel simil ar to ASTM A-471.
The minimum yield strength specified for each disc is given in Section B, Appendix 1.
2.
Tensile properties data of tests taken from the disc hub are given in Section B.
Data obtained from rim material are presented in Section C.
3.
Toughness properties are also presented in Sections B and C.
As described above, Section B contains hub properties and Section C contains rim properties.
Upper shel f energy is not presented when it is the same as the room temperature energy.
4.
The keyway temperature is presented in Section G.
This is the calculated temperature two inches from the exhaust face of the disc at the bore during full operation wil? all moisture separator reheaters functioning (where applicable).
5.
The maximum expected keyway crack size is cal culated by mul tiplying the crack growth rate by the time the unit was in operation prior to the disc bore / keyway inspection. The crack growth rate is given in Section G in response to Question I.D.8.
The resul ts are tabulated on the next page.
6.
The critical crack size at 1800 rpm and at design overspeed is prese' ted n
in Section F.
It is calculated using the relationship:
b,C.,8
^CR
- bbO i
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O 7.
This is the ratio of Item 5 to Item 6.
Where data is not avail abl e, the
" worst ' case" ratio h,as been calcul ated.
See next page.
8.
The crack growth rates are tabulated in Table 1.
These crack growth rates are *.he maximum expected rates based upon known cracks to date.
Westinghouse has changed the basis for determin!.ng these rates to utilize. the NRC gray book operating hours.
It is believed this agrees with the -way the NRC staf f determines crack growth rates.
Except for four units, the crack growth rate of the number one and six discs operate dry under normal' conditions. The four exceptions are Haddam Neck, Indian Point 2, Indian Point 3 and Cooper 1.
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9.
The bore tangential stress at 1800 rpm and st destg n verspees.tre presented in Section E.
The values presented include-the stresses oue to shrink fit and certrifugal force loads onl y.
Additional analyses to include thermal stresses and pressure stresses are being made, but are not presently avail abl e.
10.
The fracture toughness, KIC, of each disc is calcul ted from the Charpy V-notch and tensile data.
The values, presented in Sections B and C are calcul ated at the upper shel f temperature or room temperature, whichever gives the lower resul t.
11.
The minimum yield strength specified for each disc is presented in Section B.
I.D. 5 Calculated Crack Size (A) e Dise Growth Rate (in/hr)
A (inches) b,CA b C,6 3
2 3
4 5
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6 I.D. 7 Ratio of (A) to critical crack size (Act)
C LPf/ Disc #
A/Acr LP#/ Disc #
A/Acr 1/1 Gov.
2/1 Gov.
1/2 Gov.
2/2 Gov.
1/3 Gov.
2/3 Gov.
1/4 Gov.
2/4 Gov.
1/5 Gov.
2/5 Gov.
1/6 Gov.
2/6 Gov.
1/. Gen.
2/1 Gen.
1/2 Gen.
2/2 Cen.
1/3 Gen.
2/3 Gen.
1/4 Gen.
2/4 Gen.
1/5 Gen.
2/5 Gen.
1/6 Gen.
2/6 Gen.
- No crack growth rate assumed since disc runs dry l
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7.
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a.ca.0P eon MPM) g
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1:1i28ii208 ll111 1;i:i":85 la't:5EEll ilWI b, C,6 Ge SERVICE DAfa le OPER. TEMP, NETAL TEMPe HUS 60EG.Fs f}
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7055590 f.
FATT InEG.Fl 5 FATT 40EG.FI 8
M.T.
IMPACTIFT.L8 1 6.
R.T.
IMPaCTIFT.L8.8 9
U.S.
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7.
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8.
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CMaCK OaTA SPEED IRPMI STRESS hCC b c#C.
a 1.
1000 tr$ll I.
a.ce=0P 88800 MPMI glN g
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- 1. OPER. TEMP. METAL TEMP. HUS IDEG.Fi YSB' eC
ID e T 0081108702 LP TURBINE DISC thFORMAfl0N A. UNtf IDENTIFICATION 8 MATEN14L PROPERTIES IMU i C. MATERlat PRcPERTIES,lRIMI
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DISCa 6
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9.
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T058931 7
FATT 10EG.FI 5.
raTT toEG.FI
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2.
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