ML20151Z285

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Forwards Turbine Sys Maint Program for NRC Approval.Util Plans to Implement Turbine Sys Maint Program Which Requires Insp of Low Pressure Turbine Rotors for Unit Over Six operating-yr Interval During Scheduled Outages
ML20151Z285
Person / Time
Site: Limerick Constellation icon.png
Issue date: 08/19/1988
From: Kemper J
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To: Murley J
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM), Office of Nuclear Reactor Regulation
References
NUDOCS 8808290274
Download: ML20151Z285 (15)
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PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET P.O. BOX 8699 PHILADELPHI A. PA.19101 12151 f141 4 5o o SENIOR VI R E'S D E NUCLEAR August 19, 1988 Mr. T. E. Murley, Director Docket No. 50-353 Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Cmmissicti Attn: Docunent Control Desk Mall Station P1-137 Washington, DC 20555

Subject:

Limerick Generating Station, Unit #2 Turbine System Maintenance Program

References:

1) J. W. Gallagher (PEco) to W. R. Butler (NRC),

"Turbine System Maintenance Program, LGS-1",

May M , 1987

2) R. J. Clark (NRC) to E. G. Bauer, Jr.,

"Turbine System Maintenance Programf',

November 3, 1987

Dear Mr. Murley:

Section 3.5.1.3.3 of the Safety Evaluation Report (SER),

NUREG-0991, for Limerick Generating Station (LGC) Indicates that Philadelphia Electric Ccmpany (PECo) should sut.nlt" a turbine system maintenance program based on the manufacturer's calculations of missile generation probabil ities", for NRC approval . Such a program was submitted for LGS-Unit 1 with reference 1 and approved by your staff In reference 2. A similar program for LGS Unit 2 is discussed below and is attached.

Philadelphia Electric Company plans to irrplement a turbine system maintenance progrrm which requires inspection of the icw pressure turbine rotors for the unit over a six operating-years Interval during scheduled outages. The progrtm is based upon the results of the probabilistic evaluation of the Icw pressure turbines performed by the General Electric Ccmpany (GE). The evaluation used the methodology of the GE proprietary report, Probability of Misslie Generation in General Electric Nuclear Turbines, dated January 1984. This methodology has been reviewed by the NRC staff and found acceptable for use in establishing maintenance and Inspection schedules for specific turbine systems (see NUREG-1048, Safety Evaluation Report related to the operation of Hope Creek Generating Station Supp1 ment No 6, July,1986).

QO h820274egog39 h I

A DOCK 05000353 PDC

Tne proposed maintenance program, which is based upon the progrcm evaluated in NUREG-1048, assures that the probability of a turbine generating a misslie is maintained less than IE-5 per year, which is consistent with sections 3.5.1.3 and 2.2.3 of the Standard Review Plan. The program takes into account specific turbine wheel operating conditions, material properties, results of periodic in-service insoections, and other factors. The progran's determination of missile probability is based upon the probabilities of the individual parameters which may lead to the generation of a turbine misslie. As a result, the program can facilitate evaluations of the effects of changes in any parameter.

.cs The results of the GE low pressure turbine evaluation for Unit 2 (See Attachment) danonstrate that the turbine inspection intervals can be established at six (6.0) operating years with the probability of generating a misslie recolning less than 1E-5 per year. Attachment 3 provides curves of the probability of each rotor generating a misslie versus the ntnber of operating years since the latest turbine inspection.

The turbine systan maintenance program and the revision to the methodology of projecting turbine misslie generation will be included in FSAR Sections 10.2.3.6 and 3.5.1.3, respectively, during a future update of the FSAR. Should you have any questions or require additional Information, please do not hesitate to centact us.

Sincerely, c; SI dd.f ERG /bls/07078803y A' sachments Copy to: Addressee R. J. Clark, LGS Project Manager l

W. T. Russell, Region I Adninistrator

R. A. Granm, LGS Unit 2 Senior Resident Inspector l

l i

l l

ATTACFftiNT TABLES Stmnary of Missile Probabilltles - LPA Rotor SuTnary of Burst Probabilities - LPA Rotor Sunnary of Probability Infornatico for Total Rotor - LPA Stonary of Missile Probabilities - LPB Rotor Stnnery of Burst Probabilities - LPB Rotor Suntary of Probability InforTnation for Total Rotor - LPB Sunnary to Misslie Probabilities - LPC Rotor Sumnery of Burst Probabilities - LPC Rotor Surrmary of Probability InforTration for Total Rotor - LPC Figures LGS-2 LPT Rotor ' A' - Misslie Probability Vs. Operating Years LGS-2 LPT Rotor 'B' - Misslie Prcbability Vs. Operating Years LGS-2 LPT Rotor 'C' - Missile Probability Vs. Operating Years ERG / bis /07298803

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