ML18044A679
| ML18044A679 | |
| Person / Time | |
|---|---|
| Site: | Palisades  |
| Issue date: | 03/21/1980 |
| From: | Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | Ziemann D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8003270490 | |
| Download: ML18044A679 (67) | |
Text
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consumers Power company General Offices: 212 West Michigan Avenue, Jackson, Michigan 49201
- Area Code 517 788-0550 March 21, 1980 D1_i::2ctor, Nuclea.r Reactor Regulation At.t Mr Dennis L Ziemann, Chief Operating Reactors Branch No 2 US Nuclear Regulatory Commission Washington, DC 20555 DOCKET 50-255 - LICENSE DPR PALISADES PLANT -
CRACKING IN LOW-PRESSURE TURBINE DISCS Consumers Power Company was requested by NRC letter dated February 25,. 1980 to provide site specific as well as.generic turbine infonnation.
The site specific information was addressed by Consumers Power Company personnel (Appendix A).
Both proprietary and nonproprietary versions of Appendix A have been prepared.
The nonproprietary version is attached to this letter and 40 copies of the proprietary have been submitted to the :NRC.
Answers for generic questions were submitted by Mr J M Schmerling of Westinghouse to l1r D G Eisenhut of the NRC by letter dated March 14, 1980.
The site specific resp~nses contain proprietary information of the Westinghouse Electric Corporation.
In conformance with the requirements of 10 CFR Section 2.790, as amended, of the Commission~s regulations, enclosed (Appendix B) is the application for withholding this information from public disclosure and the associated affidavit.
The affidavit sets forth the basis on which the information may be withheld from public disclosure by the Commission.
Corresponde~ce with respect to the affidavit or application for withholding should reference AW-80-6 and should be addressed to Mr R Williamson, Manager, Customer Order Engineering, Westingh~1se Electric Corporation, Ste~m Turbine Divisions Lester Branch, Box 9175, Philadelphia, PA 19113.
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L This letter as well as the Westinghouse letter are being submitted within the time *limits established between Mr Wayne Stiede (Chairman of the Westinghouse Turbine Disc Committee) and the NRC.
David P Hoffman Nuclear Licensing Administrator CC JGKeppler, USNRC Enc Appendix A Table I, 24 Pages Table II, 1 Page 2
NONPROPRIET.ARY APPENDIX A ITEM 1 Provide the following information-for each low-pressure (LP) turbine:
A.
Turbine type:
The Consumers Power Company Palisades Plant consists of one tandem compound, four flow, three casirig, condensing 1,800 r/min turbine.
Each LP element is designated as a Building Block 81 Model.
B.
Number of hours of operation for each LP turbine at time of last turbine inspection or.i_f not inspected, postulated to turbine inspection:
Each LP turbine has been operated 37,426 hours0.00493 days <br />0.118 hours <br />7.043651e-4 weeks <br />1.62093e-4 months <br /> prior to the November 1979 disc inspection.
C.
Number of turbine trips and overspeeds:
This information will be submitted by April 1, 1980.
D.
For each disc:
- 1.
Type of material including material specifications - The disc material for the Palisades Plant turbine consists of nickel (Ni),
chromium (Cr), molybdenum (Mo) and vanadium (V).
This NiCrMoV material is similar to ASTM A 471.
Chemistry data for each disc is included in Table I (attached).
- 2.
Tensile properties data - These data are included in Table I.
- 3.
Toughness properties data including Fracture Appearance Transition Temperature and upper energy and temperature - These data are included in Table I.
- 4.
Keyway temperatures - These data are included in Table I.
- 5.
Calculated keyway crack size for turbine time specified in "B" above - These data are included in Table II (attached).
- 6.
Critical crack size - The ~ritical crack size data are included in Table I.
These critical crack sizes are calculated fro~ the following relation_ship:
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Where:
K1G is derived from following:
the
= [
Where:
CVN Is Impact Energy at Upper Shelf Life Jys Is the Yield Strength
- 7.
Ratio of calculated crack to critical crack size - These data are included in Table II..
- 8.
Crack growth rate - The crack growth rates are included in Table II.
The growth rates are derived from the following relationship:
[
Where:
da Is the Crack Growth Rate dt T Is the Hub Temperature From Table I Expressed in °Rankine 2
- 9.
Calculated bore and keyway stress at operating design overspeed - The bore stress data are contained in Table I.
The keyway stress varies as position; thus, there is no data available at the present time.
- 10.
Calculated K1C data - The KIC data.are located in Table I.
For derivation, refer to the answer of Question D.6 above.
- 11.
Minimum yield strength specified for each disc - These data are located in Table I.
ITEM II Provide details of the results of any completed *inservice inspection of LP turbine rotors, including areas examined, since issuance of an operating license.
For each indication detected, provide details of the location of the crack, its orientation, and size.
RESPONSE TO ITEM II The Consumers Power Company Palisades No 1 Unit had a Westinghouse field inspection team at the jobsite from November 2, 1979 to November 11, 1979 to ultrasonic inspect the keyways and disc bores of the LP rotors.
The rotors inspected were A LP-TD35051 and B LP-TD31340.
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The inspection method employed was to ultrasonic inspect all keyways on Disc 1 thru 5, both ends on each rotor.
Also, an ultrasonic 360° scan was made on the outlet side of each disc.
The inspection results are as follows:
A LP
.095 Deep Indic.ation No 2 Disc, Gen End Keyway 3 B LP
.113 Deep Indication No 4 Disc, Gov End Keyway 3
.236 Deep Indication No 2 Disc, Gov End Keyway 2
.126 Deep Indication No 2 Disc, Gov End Keyway 3 ITEM III Provide the nominal water chemistry conditions for each LP turbine and describe 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.
RESPONSE TO ITEM III The water chemistry for both LP turbines is as follows:
pH 8.5 - 9.2 Na + 0.070 Ppm Conductivity 7.0 Micromhos/Cm2 A significant change in water chemistry occurred at the Palisades Plant in 1974 when the use of phosphates were eliminated and the us~ of all volatile treatment (AVT) was adopted.
Condenser inleakage has been minimized since the condenser was retubed in 1973 by reducing plant load or shutting down the plant to repair condenser tube leaks.
This practice helps maintain secondary water chemistry within Technical Specifications limits.
Consumers. Power Company personnel do not have any substantial evidence to draw a correlation between water chemistry and turbine disc cracking.
ITEM 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.
RESPONSE TO ITEM IV The Palisades turbine was inspected in November 1979.
ITEM V If* your plant has been inspected and plans to return or has returned to power with cracks, pr~vide your proposed schedule for the next turbine inspection and the basis for this inspection schedule.
RESPONSE TO ITEM V It is the consensus of the Disc Integrity Task Force that the reinspection of the discs is warranted when:
a/ a.
er Is Equal to 1 (a/
= 1) a er Consumers Power Company performed a turbine inspection in November 1979 (results included in this letter).
Based on inspection results and calculations of crack growth rates, it has been determined a critical crack will develop after 82.4 months of additional running time on the Palisades Plant turbine.
Therefore, Consumers Power Company has decided that reinspection of the identified disc cracks is not necessary at the present time.
Results of other inspections plus additional data obtained by the Westingouse Disc Integrity Task Force will be used to determine when the next inspection is necessary.
ITEM VI Indicate whether an analysis and evaluation regarding turbine missiles have been performed for your plant and provided to the staff. 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, considera_tion should be given to scheduling such an action.
RESPONSE TO ITEM VI An analysis and evaluation has been performed and reported in the FSAR Section 14-11.S.
Revised missile calculations are being done by Westinghouse and are scheduled to be compl~ted by. the end of March 1980.
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lo BUILDING BLOCK Bl 8 1 MATERIAL PROPERTIES (HUB)
IMJN~ Y.So (KS!))
2o UNIT PALISADES ffl 3o CUSTOMER:
CONSUMo PWRo *-****-***-------*-***---*-***
"0 LP#
2 lo TYPE
~
~-
-TD 2 1 SUPPLIER:.
16VAL HEPPENSTALL 3, *Y;s. IKSI)**-
So LOCATION GEN 61 DISC#
'I 7o TEST NOo T023'1'1£ De CHEMISTRY C
MN c -1 **
--~ -- *c J
E 1 BORE STRESS SPEED IRPHI t
AS Cf, u.T.s. 1Ks11 5 1 ELONGATION 6 *.R *A*
. 7 0 FATT IDEG*f) 8 0 R*To JMp~CT!ffoLBo) 9 0 UoS, IMPACT TEMPo IDEG,FI 100 UoSe -IMPACT ENG, IFToLBol I 1-. u 0 s
- K I c CKSl*SQRT(IN,ll sr
- c
- l------* cp
' 1
(
SB -* --:r-- --- -* [
SN *,--*
CR
[
J"
(
AL J
__....... _F, CRACK DATA
~.-:~***
~-~***
,, f* i: "***.*1 t.~":! ~" '*'J.**">!*;.,,,.
- f. y
- s.., Ks I l *-** *-- ------*- --- --------
- 2. u.T.s* IKSll 3o ELONGATION
'I 1 R
- A,
So FATT IDEGof"l 60 R1T1 IMPACTIFToLBol 71 U.S, IMPACT TEMP.
CDEGoFI 81 U,S, IMPACT ENG, CfToLB,)
9
- U
- S.1 KI C
--- -. ( KS I.* SQRT 11 ~
- I I. --
.3 22
.. r* MO -1 ** ----- --c--V. ---i--*--**-----------*----* -**-------------**
(.CU l---- ---*r s l"
I* 1600
- 2. 2160 112011>1
.STRESS I KS 11 I KS I.
l* A-CR*OP 11800 RPM)
(IN.;)
. [
2o A*CR-OS COVERSF'f;:EO) (I No I_--**-**-
- 1. -- - -*---- -** --_* --
Go SERVICE DATA
[: J le OPER. HMP.* HETAL IE~l'..'e. HUS IDEGoF)
--**~*---------*----**- -*-- ------*--*-***-----*-*--***-**---- -----**--***--*-*-*--
- - - - - - --- - ------ _____ _:_..!,1.._._ ----------.:.:.-~--- -~...!..:----*-*-----*---
.;, --------. _____________., ____ _..... -._............... ___.~ -:*.... ***
iD #
00511022o'l 23 LP TURBINE DISC JNFORM~TJON A* UNIT IDENTIFICATION
- s. MATER JAL PROPERTIES IHUBI
- c. MATERIAL PROPERTIES IR IM I I
- RUILDJNG BLOCK 81 I
- TYPE
~
TD IM!No *v.s, JI KS I l I
- 2. UNIT PAL I SADES. If l
- z. SUPl"L 1 ER:
IOVALE HEPPtJ'SJAL~_
- 3. CUSTOMER:
CONSUMo PWRo 3, Y*So IKSll 1
- y.s. IKSrl.
'l. LPil 2
'l
- UoToSo li<Sf)
- 2. U*ToS* !KSll
- s. LOCATION GEN
- s. ELONC.ATION.
- 3. ELONGATION
- 6. DISC#
5 6, Ro Ao
". R,A, 7, TEST NOo T023'l31
- 7. fATT IDEG*Fl
- s. FATT IOEGoFl
- a. Ro To JMPACT!FToLBol l:>o Ro To IMPACTIFToLBol 9,
u~s. IMPACT TEMPo 7, u.s. IMPACT TEMPo COEC.,F)
IO[GoF)
I 0
- u.s. IMPACT ENG.
- a. u.s. IMPACT EN Go IFToLBol IFToLB.I
. 11
- u.s
- KIC
- 9. u.s. KJC IKSJ*SQRTC JN. I I
.(KSl*SQRTCINoll Do CHEMISTRY c
MN SI p
CR
~*o v
[
J
[.
J
(
1 t
J r
- 1 c
J
(
[ :>
[
-- J t
1
.L j
t
.J
[.
J
[
1
)
Ee BORE. STRESS F, CRACK DATA SPEED IRPMI STRESS
.1. *1800 I KS I I c-1 1
- A.. CR-OP I I 800 RP!'ll I IN, I l
- 2. 2160 ( 12011)
I KS I I 2 *.* A*CR*OS IOVERSPEEDI I IN* I Go SERVICE DH A l* OP~R. T~MP* KETAL TEMPo HUB IOEG~F1
[.
1 I.
ID II DOaa 1022o'f A* UNIT lOEHTlFICATJON.
It BUILDING BLOCK 81 2o UNIT PALISADES #I lt CUSTOMER:
CONSUMo PWRo
'It LPU 2
So LOCATION GEN 6 1 DISCU 6
7, TEST NOe TD2078'f De CHEMISTRY c
t
[
NI Ee BORE STRESS SPEED (RPM) i
- I BOO
- 2. 2160 1120~1 Ge SERVICE DATA c
(
STRESS.
CKSXI C KS I)
)
[:
LP TURBINE DIS( INFORMA1JON B, M A T E. R I A L P R 0 PE R T I E 5 IH U B I
(
lt TYPE
- l TD CM!Ne v.s.
"\\cKS!ll
- 2. SUPPLIER; HiDVALE.'""HEPPt,_NsTALL 3 1 Y1S1 IKSll
'f
- u
- T
- s 0 I K s*r I Se ELONGATION 6t RtAe 7a f"ATT IDEGtFI Bo RtT1 IMPACTIFToLBe) 9, *u t S, J MPACT TEMP.t IDEG,FI
!Oe UoSe IMPACT ENG, IFToL 13ol lit UeSt KIC IKSJ oSQRTfJN.11
(. p
]
(
CR.
1 SB
- c.
AL J
F, _CRACK DATA
']
lo OPER. TEMPt METAL IE~~~ HU~ COEG 1 F1
- (_
Ct MATERIAL PROPERTIES (RIMI 11 YeSe IKSll..
2 * *u, T, s
- I K 5 I I 3o ELONGATION
'fo R~A, So FATT 6,
R,T~
7, u.s.
- a. u.s, 91 u.s.
HO
- t.
1
[. cu J"
IDEGef)
IMPACTlf'ToLBel IMPACT TEMP1 IOE"Gefl IMPACT ENGt
"(f'TtLBol KIC IKSl*SORT( !No I l
( v 5
[
[
24
.. c -
APPENDIX A..
Iro3tE II Calculated Keyway Crack Size Ratio of Calculated Growth Rate Operating Hours x Crack to Critical LP End Disc No In/Hour Growth Rate Crack Size a
a/
acr-os A
Gov 1
0 0
0 A
Gov 2
3.54 x 10-5 1.325 0.433 A
Gov 3
1.10 x 10-5 4.12 x 10-l 0.231 A
Gov 4
4.28 x 10-6 1.60 x 10-l 0.074 A
Gov 5
2.32 x 10-6 8.68 x 10-2 0.041 A
Gov 6
0 0
0 A
Gen 1
0 0
0 A
Gen 2
3.54 x 10-5 1.325 0.417 A
Gen 3
1.10 x 10-5 4.12 x 10-l 0.228 A
Gen 4
4.28 x 10-6 1.60 x 10-l 0.071
- A Gen 5
2.32 x 10-6 8.68 x 10-2 0.036 A
Gen 6
0 0
0 B
Gov 1
0 0
0 B
Gov 2
3.54 x 10-5 1.325 0.473 B
Gov 3
1.10 x 10-5 4.12 x 10-l 0.216 B
Gov 4
4.28 x 10-6 1.60 x 10-l 0.048 B
Gov 5
2.32 x 10-6 8.68 x 10-2 0.041 B
Gov 6
0 0
0 B
Gen 1
0 0
0 B
Gen 2
3.54 x 10-5 1.325 0.518 B
Gen 3
1.10 x 10-5 4.12 x 101 0.237 B
Gen 4
4.28 x 10-6 1.60 x 101 0.054 B
Gen 5
2.32 x 10-6 8.65 x 10-2 0.037 B
Gen 6
0 0
0 NOTE:
Discs 1 and 6 are assumed to have zero crack growth rate as the hubs are in a dry steam region.
APPEHDIX B
Darrell G. Eisenhut Division of Operating Reactors Office of Nuclear Reactor Regulation US Nuclear Regulatory Commission Washington DC 20555
Subject:
- APPLICATION FOR WITHHOLDING PROPRIETARY INFORMATION FROM PUBLIC DISCLOSURE Palisades Docket #50-255 AW-80-6 March 14, 1980 Information in Response to NRC Request for Information of February 25, 1980, Relative to Low Pressure Turbine Disc Integrity.
Reference:
Appendix A letter froJil D. P. Hoffman to Eisenhut, dated 3/19/SO
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 information which is further identified in the affidavit 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 10CFR Section 2.790 of the Commission's regulations.
Correspondence with respect to this application for withholding or the accom-panying affidavit should be addressed to the undersigned.
Very truly yours, r *;..
'i
~ n
- \\..i-'k\\ 1 *> L 1.-*.Jl *.. s.... 4..,.,_,,..,-
R. Williamson, Manager Customer Order Engineering Westinghouse Electri.c Corporation
COMMONWEALTH OF PENNSYLVANIA COUNTY OF DELAWARE:
AFFIDAVIT Ref:
AW-80-6 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 Westinghouse 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:
c--:;;
- r~ r,
,.?'
~-~...........
- \\/ i
~:::-:::...+~*- ~.......,v,~/ Z.~ =""\\;* vJ--\\..6-<--*'--_
~
J
\\.
HENRY E'. SQUILLACE Notary ::'uolic, Marple Twp., Delaware Co.
My l.:Dmm!ssioo Expires Oct. 18. 1980 Robert Williamson, Manager Customer Order Engineering
(
.l (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 Section 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 Westinghouse 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.
(i)
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-dence.
The application of that system and the substance of that system constitutes Westinghouse p~licy and provides the rational basis required.
Under that system, 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 or improved marketability.
(c) Its use by.a competitor would reduce his expenditure of resources or improve his competitiv_e 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 comme_rcial strategies of West-inghouse, its customers or suppliers.
(e) It reveals aspects of past, present, or future Westing-house or customer funded development plans and programs of potential commercial value to Westinghouse.
( f) It cont.ains 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 com-petitive disadvantage by reducing his expenditure of resources at our expense.
(d)
Each component of proprietary information pertinent to a particular competitive advantage is potentially as valuable as the total competitive advantage. If com-petitors acquire components of proprietary information, any one component may be the key to the entire puzzle, 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.
(f)
The Westinghouse capacity to invest corporate assets in research and development depends upon the success*in obtaining and maintaining a competitive advantage.
(iii) The informat*ion 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 D ~ P. Hoffman to
'2.J 7>.L. ~EH-'IAJ/J ".TA!!.
lHeeAfit:tt, dated March~, 1980 concerning infor-
"'J)P~';:"
3.,/*cO 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 cuitomers 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.
(c)
Westinghouse can sell services based upon the exper-ience gained and the test equipment and methods dev.eloped.
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 co.uld only be duplicated by a competitor if he were to invest similar sums of money and provided he had the appro-priate talent available and could somehow obtain the requi-site experience.
Further the deponent sayeth not.
I PROPRIETARY APPENDIX A ITEM 1 Provide the following information for each low-pressure (LP) turbine:
A.
Turbine type:
The Consumers Power Company Palisades Plant consists of one tandem compound, four flow, three casing, condensing 1,800 r/min turbine.
Each LP element is designated as a Building Block 81 Model.
B.
Number of hours of operation for each LP turbine at time of last turbine inspection or if not inspected, postulated to turbine inspection:
Each LP turbine has been operated 37,426 hours0.00493 days <br />0.118 hours <br />7.043651e-4 weeks <br />1.62093e-4 months <br /> prior to the November 1979 disc inspection.
C.
Number of turbine trips and overspeeds:
This information will be submitted by April 1, 1980.
D.
For each disc:
- 1.
Type of material including material specifications - The disc material for the Palisades Plant turbine consists of nickel (Ni),
chromium (Cr), molybdenum (Mo) and vanadium (V).
This NiCrMoV material is similar to ASTM A 471.
Chemistry data for each disc is included in Table I (attached).
- 2.
Tensile properties data - These data are included in Table I.
- 3.
Toughness properties data including Fracture Appearance Transition Temperature and upper energy and temperature - These data are included in Table I.
- 4.
Keyway temperatures - These data are included in Table I.
- 5.
Calculated keyway crack size for; turbine time specified in "B" above - These data are included in Table II (attached).
- 6.
Critical crack size - The critical crack size data are included in Table I.
These critical crack sizes are calculated from the following relationship:
a Q
(
[K ]2 er 1.21 rr JBore.
1
- 10 CPR 2.790 Information
Where: [acr Is the Critical Crack Size Krc Is the Fracture Toughness
?Bore Is the Shape Factor = 1.35 for This Is the Bore Stress Is the Keyway Radius = 0.375 Inches K1c is derived
'::: :h[s':::o::~'- Jr;i] i12 Where:
CVN Is Impact Energy at Upper Shelf Life Jys Is the Yield Strength Case 1
- 7.
Ratio of calculated crack to critical crack size - These data are included in Table II.
- 8.
Crack growth rate - The crack growth rates are included in Table II.
The growth rates are derived from the following relationship:
[
d (10.35~~
d ~ = 25. 36 e -
T 1 Where:
da Is the Crack Growth Rate dt T
Is the Hub Temperature From Table I Expressed in °Rankine 2
- 9.
Calculated bore and keyway stress at operating design overspeed - The bore stress data are contained in Table I.
The keyway stress varies as position; thus, there is no data available at the present time.
- 10.
Calculated K1C data - The KIC data are located in Table I.
For derivation, refer to the answer of Question D.6 above.
- 11.
Minimum yield strength specified for each disc - These data are located in Table I.
ITEM II Provide details of the results of any completed inservice inspection of LP turbine rotors, i_ncluding areas examined, since issuance of a_n operating license.
For each indication detected, provide details of the location of the crack, its orientation, and size.
RESPONSE TO ITEM II The Consumers Power Company Palisades No 1 Unit had a Westinghouse field inspection team at the jobsite_from November 2, 1979 to November 11, 1979 to ultrasonic inspect the keyways and disc bores of the LP rotors.
The rotors inspected were A LP-TD35051 and B LP-TD31340.
10 CFR 2.790 Information.
- 1.
3 The inspection method employed was to ultrasonic inspect all keyways on Disc 1 thru 5, both ends on each rotor.
Also, an ultrasonic 360° scan was made on the outlet side of each disc.
The inspection results are as follows:
A LP
.095 Deep Indication No 2 Disc, Gen End Keyway 3 B LP
.113 Deep Indication No 4 Disc, Gov End Keyway 3
.236 Deep Indication No 2 Disc, Gov End Keyway 2
.126 Deep Indication No 2 Disc, Gov End.Keyway 3 ITEM III Provide the nominal water chemistry conditions for each LP turbine and describe 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.
RESPONSE TO ITEM III The water chemistry for both LP turbines is as follows:
pH 8.5 - 9.2 Na + 0.070 Ppm Conductivity 7.0 Micromhos/Cm2 A significant change in water chemistry occurred at the Palisades Plant in 1974 when the use of phosphates were eliminated and the use of all volatile treatment (AVT) was adopted.
Condenser inleakage has been minimized since the condenser was retubed in 1973
.*by reducing plant load or shutting down the plant to repair condenser tube leaks.
This practice helps maintain secondary water chemistry within Technical Specifications limits.
Consumers Power Company personnel do not have any substantial evidence to draw a correlation between water chemistry and turbine disc cracking.
ITEM 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.
RESPONSE TO ITEM IV The Palisades turbine was inspected in November 1979.
10 CPR 2.790.
Infoxmatlon
ITEM 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.
RESPONSE TO ITEM V It is the consensus of the Disc Integrity Task Force that the reinspection of the discs is warranted when:
a/ a er Is Equal to 1 (a/
= 1)-
a er Consumers Power Company performed a turbine inspection in November 1979 (results included in this letter).
Based on inspection results and calculations of crack growth rates, it has been determined a critical crack will develop after 82.4 months of additional running time on the Palisades Plant turbine.
Therefore, Consumers Power Company has decided that reinspection of the identified disc cracks is not necessary at the present time.
Results of other inspections plus additional data obtained by the Westingouse Disc Integrity Task Force will be used to determine when the next inspection is necessary.
ITEM VI.
Indicate whether an analysis and evaluation regarding turbine missiles have been performed for your plant and provided to the staff. 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.
RESPONSE TO ITEM VI An analysis and evaluation has been performed and reported in the FSAR Section 14-11.5.
Revised missile calculations are being done by Westinghouse and are scheduled to be completed by the end of March 1980..
Key:
[ J Indicates Westinghouse Proprietary Information
- 4 10 CFR 2.790 Inior:rri. a. tl~-n
1-1
~
0.... a a
..... g ID II 0081102201 A* UNIT IDENTIFICATION lo 8UJLD1NG BLOCK 81 2 e UN IT 39 CUSTOMER:
'l
- LP#
PAL! SADES "l CONSUMo PWRo 5, LOCATION 0 1 DISCll 7, TEST NOo T026051
- o. CHEMISTRY c
t
STRESS
~=
~BOO 160 11201111 I IC s I I KSI Go SERVICE DATA I
GOV l
HN t _.21 l !s PROPRllTARY
.Appendix A TABU: 1 LP TURBINE DISC IN~ORHATION B. MATERIAL PROPERTIES IHUBI le TYPE H
"\\
TD IH!No YoSo
!OoOJ (KSill 2 0 SUPPLIER:
~
DVALE HEPP.
NST~LL 3e Y*So IK5JI
. 1170000
- q. U*ToS* IKSI) 132.000
- s. ELONGATION 20 0 0 6 0 ReAo 5713 71 FATT IDEG*FI
- 120,0 8, Role JHPACT(FToLBol 7'lo5 9 0 UoSo IMPACT TEHPo 7So0 IOEG 0 rl ****-**-**-
100 UoSo IMPACT ENG, 7'lo5 lf'ToLe*I 11* UoSo KlC 200.qQ IKSJ.SQRTC INo 11 Co
~ATERIAL PROPERTIES CRIMI I* v.s. IKSll
?.. u.*r.s. rKSII El;ONGATJON
.s.
'l.
- s.
60 7,
R.A, FATT Ro To u.s.
- 9, u.*s.
9, u.s.
IDEGofl lMPACTIFToLBol IMPACT TEMP, IDE G, F l IMPACT ENGo IFToLB.I KIC (KSl*SQRTI !No) I l
- 1 is.ooo* **-*-*- ---
129.oon 2 2. 'l 6713
-120.n.
65,Q
. 0.o 65,o 18'1*58
.. **c-*:h p
CR J.....
[.ooa l l 1*68 1 "t ~ ~ 0*1--*** -*.. *-.. t~ i 11--***-.... *-----*-'."--*---** ------*- ---
']
t r~2. 100".
l.71.000 j se J SN t. 'l f'.
l AL l
cu t.. l Cf.IACK DATA I*
A~CR-OP (1800 RPM) (IN,)
2* A-CR*OS tOVERSPEEOI llN 1 l r 3. 2s]
- - L2.11s
!t OPER. TEHPo HETAL TEMP, HUB (DEG.fl
!.4~:-*J!lt*~~.... ~iJ.. ~~.:1tft...:;*.;.~.... ~;,r~~"'~"~;;,~1'"tt."iiJ..~~~;:~;~!!,;;..i,~".;:.ijlj:O:t',1:1.a'.:~::.~~~;'io:~:i~!\\:*.~;.,.~~:~-~~-.;;~.:..~~:.;;..*~~.... :z.;i.t:,:::~~~~~.:..:._:..._........_.,_:,_.:.... ~
_ _;_._*_**:~~--:.::..--.:..... :..J.L,_~~....:~-.... -_.,_..;..:.__.__~;::_~_.._
lD 13 0001102201 LP TURBINE DISC INFORMATION A* UNIT IDENTIFICATION 1, BUILDING BLOCK 81 2, UNJT lo CUSTOMER:
~, LPll 51 LOCATION 6 1 DISCll 7 1 -TEST NOo Do CHEMISTRY PAL I SADES t'1 CONSUM 1 PWRo - -
1 TD23'111 GOV
.2 C
MN MATERIAL PROPERTIES IHUBI 1 1 TYPE t
~
TD IMIN1 YoSo 110*0 (KSI I I 2, SUPPLIER:
IDVAL HEPP STALL 3, Y1So CKSll 116,000
~. u.T.s. 1Ks11 13~.000 5 1 ELONGATION 2lo2 6, RoAo 65o9
- 1. FATT *coEG*FI.
-110.0 80 RoTo lHPACTIFToLBo)
B6o0 9 0 UoSo IMPACT TEMPo 7S 0 0
- 10. u.s.
I 1, u.s.
SI IDEG,FI IMPACT ENG.
IFToLBol KlC
- - _.JKSleSQRTIJNoll p
8610 217*39
[
- 2 5 l.. ----. l. l 0 l
[
- 02 ]
[.oos l CR (1*67]
.STRESS I
- 1800
!KSIJ
- 2. 2160 112011
.. KS I
( 61.500)
- 69,800 Ge SERVICE DATA Q
()
I* OPER. TEHPo METAL !EMPe HUB IDEGefl
~
~
'-;]
c.o*
0 SB l~N.. ') -
AL l ~
)"
f, CRACK DATA 2
Co MATERIAL PROPERTIES iRIM"i*-------
lo y,s, IKSll 2o* UoToS* IKSll lo ELONGATION 1j6.ooo-.
131.000 2106
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2 So LOCATION GEN 6 1 DISCll 6
7, TEST NO*
T02078'1 Be MATERIAL "PROPERTIES (HUBi lo TYPE TD IMIN. y.s.
f'110.o"l (KSJll
- 2. SUPPLIER:
~!OVAL( HEPPlNSTALL.
3, y,5, IKS!I 112,DOO
'I,.u.r.s. 1Ks11 121.soo*
5, ELONGATION 2006 6 0
~tAo.
5706 7 0 fATT CDEGtFI
- l20o0 8, RtTo IMPACTIFToLBeJ 70~5 9, u,s, IMPACT TEMPe 75e0 IDEG,FI JO, U*So IMPACT £NG, 70o5 CFToLotl lie UtSt KIC J9016'1 IKSl*SQRTIINell _
01 CHEMISTRY c
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( 3. 'f7 )
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E, BORE STRESS SPEED IRPHI 1
- 1aoo*
2~ 2160 (120~1 Go SERVICE DATA STRESS I KS I I KSI l
ss.-soo "'\\
65o'I00 l
[
l91J 1 f, CRACK OATA Co MATERIAL PROPERTIES CRIMI l *
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3,
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61 '*
y,s,* IKSII u.T.s* IKSll ELONGATION Ro Ao fATT R *.T
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PROPRIETARY iii APPENDIX A
\\,
0 nrntE II Calculated Keyway Crack Size Ratio of Calculated Growth Rate Operating Hours x Crack to Critical LP End Disc No In/Hour*
Growth Rate Crack Size a
a/
acr-os A
Gov 1
0 0
0 A
Gov 2
3.54 x 10-5 1.325 0.433 A
Gov 3
1.10 x 10-5 4.12 x 10-1 0.231 A
Gov 4
4.28 x 10-6 1.60 x 10-l 0.074 A
Gov 5
2.32 x 10-6 8.68 x 10-2 0.041 A
Gov 6
0 0
0 A
Gen 1
0 0
0 A
Gen 2
3.54 x 10-5 1.325 0.417 A
Gen 3
1.10 x 10-5 4.12 x 10-l 0.228 A
Gen 4
4.28 x 10-6 1.60 x 10-l 0.071 A
Gen 5
2.32 x 10-6 8.68 x 10-2 0.036 A
Gen 6
0 0
0 B
Gov 1
0 0
0 B
Gov 2
3.54 x 10-5 1.325 0.473 B
Gov 3
1.10 x 10-5 4.12 x 10-1 0.216 B
Gov 4
4.28 x 10-6 1.60 x 10-1 0.048 B
Gov 5
2.32 x 10-6 8.68 x 10-2 0.041 B
Gov 6
0 0
0 B
Gen 1
0 0
0 B
Gen 2
3.54 x 10-5 1.325 0.518 B
Gen 3
1.10 x 10-5 4.12 x 101 0.237 B
Gen 4
4.28 x 10-6 1.60 x 101 0.054 B
Gen 5
2.32 x 10-6 8.65 x 10-2 0.037 B
Gen 6
0 0
0 NOTE:
Discs 1 and 6 are assumed to have.zero crack growth rate as the hubs are in a dry steam region.
lQ CFR 2.790 Information