ML17258A894

Advises That SEP Topic III-4.B Re Turbine Missiles Has Been Made Generic Due to New Info Issued by Westinghouse. Previously Issued Assessment for Facility Is No Longer Valid

ML17258A894
Person / Time
Site:	Ginna
Issue date:	03/16/1981
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Maier J ROCHESTER GAS & ELECTRIC CORP.
References
TASK-03-04.B, TASK-3-4.B, TASK-RR LSO5-81-03-034, LSO5-81-3-34, NUDOCS 8103230657
Download: ML17258A894 (10)

Text

0 Docket No. 50-244 LS05-81-03-034 SING

~g pe Hr. John E. Ha,er Vice President

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Electric and Stkam Production Rochester Gas 8 Electric Corporation 89 East Avenue Rochester, New York 14649

SUBJECT:

R. E. GINNA - SEP TOPIC III-4.B, TURBINE MISSILES This letter is to advise you that Topic III-4.B, Turbine Missiles has been made generic for reasons given fn the enclosure.

The previously issued Topic III-4.B assessment for your plant is no longer valid.

This is a result of new information issued by Mestinghouse as a result of the multi-plant generic cracking problem applicable to all plants with Mestinghouse low pressure turbines.

The matter will be handled as part of the solution to this generic problem.

Sincerely, Original signed by Dennis M. Crutchfield Dennis H. Crutchfield,. Chief Operating Reactors Branch No.

5 Division of Licensing

Enclosure:

As stated cc w/enclosure:

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Docket No. 50-N4 Hr. John E. Maier Vice President Electric and Steam Production Rochester Gas 5 Electric Corporation 89 East Avenue Rochester, New York 14649

SUBJECT:

R. E. GINNA -

SEP TOPIC III-4.B, TURBINE MISSILES This letter is to advise you that Topic III-4.B, Turbine Missiles has been made generic in the Systematic Evaluation Program (SEP) review of your facility for reasons given in the enclosure.

The previously issued Topic III-4.B assessment for your plant is no longer valid.

This is a result of new infor-mation issued by Westinghouse as a result of the multi-plant generic cracking problem applicable to all plants with Westinghouse low pressure turbines.

The matter will be handled as part of the solution to this generic problem.

Si ncerely,

Enclosure:

As stated Dennis H. Crutchfield, Chief Operating Reactors Branch No.

5 Division of Licensing cc w/enclosure:

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Docket No. 50-244 LS05-81-03-034 UNITED STATES NUCLEAR REGULATORY COMMISSlON WASHINGTON, D. C. 20555 March 16, 1981 Mr. John E. Maier Vice President Electric and Steam Production Rochester Gas 5 Electric Corporation 89 East Avenue'ochester, New York 14649

SUBJECT:

R. E. GINNA - SEP TOPIC III-4.B, TURBINE MISSILES This'etter is to advise you that Topic III-4.B, Turbine Missiles has been made generic for reasons given in the enclosure.

The previously issued Topic

.III-4.B assessment for your plant is no longer valid.

This is a result of new information issued by Westinghouse as a result of the multi-plant generic cracking problem applicable to all plants with Westinghouse low pressure turbines.

The matter will be handled as part of the solution to this generic problem.

Si nce rely,

Enclosure:

As stated ennis M. Crutchfield Chief Operating Reactors Branch No.

5 Division of Licensing cc w/enclosure:

See next page

Mr. John E. Maier

.March 16, 1981 cc w/enclosure:

Harry H. Voigt, Esquire, LeBoeuf, Limb, Leiby and MacRae 1333 New Hampshire Avenue~ A; W.

Suite 1100 Washington, D. C.

20036 Mr. Michael Slade 12 Trai lwood Circle Rochester, New York 14 18 Rochester Coranittee for Sci ent ific Informat ion Robert E. Lee, Ph.D.

P. 0.

Box 5236 River Carpus Station Rochester, New York 14627 Jeffrey Cohen New York State Energy Office Swan Street Building Core 1,

Second Floor Emp ire State Plaza

Albany, New York 12223 Director, Technical Development Programs State of New York Energy Office Agency Building 2 Empire State Plaza

Albany, New York 12223 Rochester Public Library 115 South Avenue Rochester, New York 14604 Supervisor of the Town of Ontario 107 Ridge Road West

Ontario, New York 14519 Resident Inspector R. E. Ginna Plant c/o U. S.

NRC 1503 Lake Road

Ontario, New York 14519 Ezra I. Bialik Assistant Attorney General En vi ronmenta 1 P rotect ion Bureau New York State Department of Law 2 World Trade Center New York, New York 10047 Director, Criteria and Standards Division Office of Radiation Programs (ANR-460}

U. S. Environmental Protection Agency Washington, D. C.

20460 U. S. Environmental Protection Agency Region II Office ATTN:

E I S COORD INATOR 26 Federal Plaza New York, New York 10007 Herbert Grossman, Esq.,

Chairman Atomic Safety and Licensing Board U. S. Nuclear Regulatory Comnission Washington, D. C.

20555 Dr. Richard F. Cole Atomic Safety and Licensing Board U. S. Nuclear Regulatory Comnission Washington, D. C.

20555 Dr.

Emmeth A. Luebke Atomic Safety and Licensing Board U. S. Nuclear Regulatory Coranission Washington, Q.

C.

20555 Mr. Thomas B. Cochran Natural Resources Defense Council, Inc.

1725 I Street, N.

W.

Suite 600 Washington, D. C.

20006

J NCLOSURE SEP TOPIC III-4.B TURBINE MISSILES The purpose of this topic is to,assure that, with respect to potential turbine missiles, all structures, systems and components important to safety either have adequate protection by means of structural barriers or have an acceptably low probability of damage.

Regulatory Guide 1. 115 and 1.117 and Standard Review Plan (SRP) 3.5.1.3 provide guidance on this subject.

As discussed in SRP 3.5.1.3, it is acceptable to perform a probability analysis of damage to safety related structures, systems and components by potential turbine missiles and compare the calculated probability of damage to an acceptable probability.

The analysis includes utilizing the following individual probabilities:

(1) the probability of turbine failure leading to the ejection of turbine missiles due to design speed failures and destructive overspeed failures (Pl), (2) the probability of strike (P2) and (3) the probability of damage (P3).

SRP 3.5.1.3 gives acceptable values of Pl based on historical turbine data.

During November 1979, the NRC staff became aware of low pressure turbine disc cracking in Westinghouse turbines at several operating plants.

Additional inspections at other plants possessing Westinghouse turbines also indicated cracking thus implying a generic problem applicable to plants with Westinghouse turbines.

Consequently, on February 25,

1980, the NRC issued 50.54(f) letters to utilities with Westinghouse low pressure turbines requesting information related to this problem.

As a result of the turbine cracking problem, Westinghouse is in the process of revising its probability of turbine failure leading to the ejection of turbine missiles (Pl) and their exit energies.

They expect to submit details of these analyses to the Materials Engineering Branch of the NRC staff for review in April 1981.

To more efficiently utilize NRC staff manpower and because the cracking problem is a multi-plant problem generic to all plants with Westinghouse turbines and extending beyond those plants in the Systematic Evaluation

Program, we are making generic Topic III-4.B "Turbine Missiles" for

'hose plants possessing Westinghouse low pressure turbines.

The turbine inspection program developed by the f1aterials Engineering Branch for Westinghouse turbines provides assurance that turbine missile risks will remain acceptably low.

The reasoning is discussed in the staff's letter of February 19, 1980 to the Atomic Safety and Licensing Board concerning the North Anna nuclear power station.

The staff has developed inspection schedules for those plants with Westinghouse turbines operating with cracks based on the 'staff's crack growth model.