View source for PY-CEI-NRR-0977, Forwards Turbine Sys Maint Program Based on Turbine Mfg Calculations of Turbine Missile Probabilities.Program Created to Resolve Licensing Issue,Per Suppl 3 to SER (NUREG-0887,Section 3.5.1.3)

{{Adams
| number = ML20246P672
| issue date = 03/20/1989
| title = Forwards Turbine Sys Maint Program Based on Turbine Mfg Calculations of Turbine Missile Probabilities.Program Created to Resolve Licensing Issue,Per Suppl 3 to SER (NUREG-0887,Section 3.5.1.3)
| author name = Kaplan A
| author affiliation = CLEVELAND ELECTRIC ILLUMINATING CO.
| addressee name = 
| addressee affiliation = NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
| docket = 05000440
| license number = 
| contact person = 
| case reference number = RTR-NUREG-0887, RTR-NUREG-887
| document report number = PY-CEI-NRR-0977, PY-CEI-NRR-977, NUDOCS 8903280287
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
| page count = 15
}}

=Text=
{{#Wiki_filter:_              . _ _ - - _ _ - _ _ _ _ _ -              _-
4 THE CLEVELAND ELECTRIC ILLUMINATING COMPANY P.O. BOX 97 E PERRY, OHIO 44081 5 TELEPHONE (216) 259-3737   E                 ADDRESS-10 CENTER ROAD FROM CLEVELAND: 241 1650 Serving The Best 1.ocation in the Nation Al Kaplan                                                                                      PERRY NUCLEAR POWER PLANT vlCE PRESOENT March 20, 1989 PY-CEI/NRR-0977 L U.S. Nuclear Regulatory Commission Document Control Desk Washington D.C. 20555 Perry Nuclear Power Plant Docket No. 50-440 USAR Appendix 1B Commitment #4 - Turbine System Maintenance Program Centlemen:
The Perry Nuclear Power Plant USAR Appendix 1B contains the subject commitment, which was created to resolve a licensing issue described in Supplement 3 to the Perry Safety Evaluation Report (NUREG 0887, Section 3.5.1.3.). The Cleveland Electric Illuminating Company (CEI) is required to submit a turbine system maintenance program based on the turbine manufacturer's calculations of turbine missile probabilities. For the Perry plant, the SER defines the range of acceptable failure (i.e. external missile generation) probability to be less than 1E-5.
The General Electric Company methodology for calculating turbine missile generation probability is described in a proprietary report entitled
             " Probability of Missile Generation in General Electric Nuclear Turbines" by the General Electric Company Large Steam Turbine-Generator Department. This report has previously been reviewed and approved by the NRC for referencing as an acceptable method for use in establishing maintenance and inspection schedules for specific turbine systems.
Using this methodology, the attached Perry calculation results for all three stages of the Unit I low pressure turbine (Attachment 1) show that the probability of external missile generation is 6.2 E-6 per year af ter six years of actual turbine operation, which satisfies the SER criterion with an additional margin of approximately 1.6.
CEI therefore proposes to perform a volumetric inspection of each low pressure turbine within a six year period of actual turbine operation (during refueling or maintenance shutdowns). This will typically correspond with four refueling cycles each consisting of 18 months of turbine operation, with the turbine inspected in stages at different refueling outages so that each low pressure turbine wheel is inspected within its six year operating interval.
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USNRC                                                                   '                                                               March 20, 1989 PY-CEI/NRR-0977 L The turbin'. cesembly and steam valve inspections will.be performed in accordance with Attachment 2, a proposed revision to the Perry USAR Section 10.2.3.6, which describes the ' subject' inspection / maintenance program in' sufficient detail to meet'USAR Appendix 1B Commitment #4 and referenced SER commitments. Attachment 2 will be incorporated in the Perry USAR amendment
                                                                ~
which is docketed after notification that the NRC finds the subject program acceptable.
In addition to the maintenance program described above, please note that relevant turbine-valve testing and inspection is prescribed by the Perry Technical Specification 4.3.8.2.                                      Industry and NRC technical evaluation of-these turbine valve surveillance intervals has and may continue.to result-in recommended extensions of selected test intervals, e.g. for control valves.
Separate submittals addressing these issues will be submitted as necessary to implement such recommendations.
If you have further questions, please feel free to call.
Very truly yoursL Al Kaplan Vice President Nuclear Group i
AK:njc                                                                                                                                                                                                j Attachments cc:   T. Colburn NRC Resident Inspector's Office NRC Region III s
l
______.__.__m._   _ _ _ _ _ _ _ _   ____.m____ .m____         _ _ _ - - . - . _ _ . _ _ _ _ _ . _ . . - - _ _ _ . - -______--___i.m             -
__.-.m_--____--.____ - . - - _ _ _ _ _ . ___._____

Attachment 1 PY-CEI/NRR-0977 L Calculation Summary Perry Unit 1 Turbine Failure Analysis LIST OF TABLES & FIGURES Table 1 - Summary of Missile Probabilities - LPA Rotor Table 2 - Summary of Burst Probabilities - LPA Rotor Table 3 - Summary of Probability Information for Total Rotor - LPA Rotor Table 4 - Summary of Missile Probabilities - LPB Rotor Table 5 - Summary of Burst Probabilities - LPB Rotor Table 6 - Summary of Probability Information for Total Rotor - LPB Rotor Table 7      Summary of Missile Probabilities - LPC Rotor Table 8 - Summary of Burst Probabilities - LPC Rotor Table 9 - Summary of Probability Information for Total Rotor - LPC Rotor Figure 1 - Missile Probabilities by Service Time t

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         ~                                                                          PY-CEI/NRR-0977L Attachment 2 Page 1 of 2 10.2.3.6             Inservice Inspection and Maintenance Program 10.2.3.6.1           Turbine Assembly Inspection / Maintenance The inservice inspection and maintenance program for the low pressure turbine assembly will be performed within a six year period of actual turbine operation (during refueling or maintenance shutdowns). This vill typically correspond with four refueling cycles each consisting of 18 months of turbine operation, with the turbine inspected in stages at different refueling outages such that each low pressure turbine wheel is inspected within its six year operating interval. The high pressure rotor vill be inspected at about 10 year intervals of actual turbine operation. This program vill include disassembly of the turbine and complete inspection of all normally inaccessible parts (i.e., couplings, coupling bolts, turbine shaft, low pressure turbine buckets, low pressure wheels, and high pressure rotors).
This turbine assembly inspection vill consist of the following visual, surface and volumetric examinations:
: a.      A thorough volumetric examination of low pressure wheels and high    !
pressure rotors, including areas immediately adjacent to keyvays and I bores.
: b.      Visual examination of accessible surfaces of wheels and rotors.
: c.      Visual and surface examination of low pressure buckets.
: d.      100% surface examination of couplings and coupling bolts.
10.2.3.6.1.1         External Turbine Missile Generation Probability The turbine assembly inspection interval was selected on the basis of acceptably low probabilities of Perry turbine missile generation. The General Electric Company has performed a Perry-specific analysis, using analytical methods reported in " Probability of Missile Generation in General Electric Nuclear Turbines" by the General Electric Company Large Ster.m Turbine-Generator Department. The methodology described in this report addresses the probability of generating a turbine missile external to the turbine casing.
Earlier work identified the shrunk-on wheels of the low-pressure turbine to be the potential source of turbine missiles. The methodology employed provides for separate determination of missile generation probability for the unique parameters associated with each shrunk-on wheel. In addition to missile probability, output of the calculation includes information pertaining to the predicted crack size and wheel burst probabilities as a function of time.
The methodology for determination of missile probability contains three major components:
The probability of the turbine attaining speeds higher than those occurring during normal operation.
The estimation of wheel burst probability as a function of speed.
The probability of a wheel fragment penetrating the turbine casing and thus generating an external missile.

PY-CEI/NRR-0977 L Attachment 2 Page 2 of 2 Calculations indicate that the dominant failure mode would be brittle fracture emanating from a stress corrosion crack which occurs at the axial keyvay in l          the bores of shrunk-on wheels.      In the unlikely event that a missile is
!         generated, the source of this missile is most likely to be an intermediate wheel of the low-pressure turbine. In addition, the turbine speed at the time of this missile generation it most likely to be normal running speed.
Finally, should a wheel burst occur, it is likely to be contained by the turbine casing and not produce an external missile.
l         The Perry turbine calculation results for all three stages of the Unit 1 lov l          pressure turbine show that the probability of external missile generation is j
I 6.2 E-6 per year after six years of actual turbine operation.
10.2.3.6.'        Turbine Steam Valve Inspection / Maintenance The inservice inspection of turbine steam valves vill include the following:
: a. Dismantle at least one main steam stop valve, one main steam control valve, one reheat stop valve, one reheat intercept valve, and one of i                     each type of steam extraction valve, at approximately three year intervals during refueling or maintenance shutdowns coinciding vith the inservice inspection schedule required by ASME Code Section XI.
Conduct a visual and surface examit.ation of valve seats, disks and stems. If unacceptable flaws, excessive corrosion or improper clearances are found in a valve, it vill be repaired or r6placed and all valves of that type vill be inspected. Valve bushings vill be inspected and cleaned, and bore diameters vill be checked for proper clearance.
: b. Main steam stop and control, reheat stop and intercept valves, and the turbine overspeed trip mechanism vill be exercised at least once a week by closing each valve or performing the overspeed trip test and observing, by the valve position indicator, that the valves move smoothly to a fully closed position. This test will be made in accordance with technical specification requirements, which further stipulate that online test failures of any one of these steam line subdivisions will require: 1) repair or replacement of failed                              '
components within 72 hours, or 2) valve closure in the affected steam line, or turbine isolation from the steam supply until repairs are completed.
: c. During normal unit eperation, the power assisted extraction                                j non-return valves vill be tested by partially closing the valves                           i using thc solenoid test valves. For critical power assisted valves                     j (see Figure 10.2-9) this testing vill be done weekly.                                      1 i
10.

==2.6            REFERENCES==
FOR SECTION 10.2                                                          ,
: 1. Letter, A. Kaplan (CEI) to U.S. Nuclear Regulatory Commission (NRC),
                      "USAR Appendix 1B Commitment #4 - Turbine System Maintenance Program," PY-CEI/NRR-0977L, March 20, 1989.
NJC/ CODED /1926
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