ML22130A010

Duke Presentation for April 28, 2022 Public Meeting - Containment Liner

ML22130A010
Person / Time
Site:	Oconee
Issue date:	04/28/2022
From:	Duke Energy Carolinas
To:	Office of Nuclear Reactor Regulation
Wu A, 301-415-2995
Shared Package
ML22130A003	List: ML22130A009 ML22130A010 ML22130A011 ML22130A012
References
Download: ML22130A010 (12)

Text

ONS Subsequent License Renewal NRC Public Meeting - RAI 4.6.1-1a April 28, 2022

Topic of Discussion RAI 4.6.1-1a - Request Provide the fatigue waiver analyses of record (calculation that includes material and cyclic inputs and fatigue parameter evaluations) that demonstrates how the six criteria in the ASME Code,Section III, paragraph N415.1 (1965 edition code of record) were shown to be met for the containment liner plate and each of the cold penetrations for which it is credited.

Alternatively, describe in sufficient technical detail (providing reference to the analysis of record, including material and cyclic inputs and fatigue parameter evaluations) how each of the six acceptance criteria in the ASME Code,Section III, paragraph N415.1 (1965 edition code of record) were satisfied for the containment liner plate and each of the cold penetrations for which the fatigue waiver analysis is credited.

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Oconee Containment Liner Plate and Cold Penetration Fatigue Exemption A fatigue exemption evaluation was performed for the containment liner plate and cold penetrations in accordance with the 1965 Edition of the ASME Boiler and Pressure Vessel Code,Section III, Nuclear Vessels (ASME Code).

Cold penetrations are defined as mechanical, electrical, equipment and personnel hatches, and fuel transfer tube, excluding the main steam and main feedwater penetrations.

The evaluation was performed to the six criteria described in the Article 4, Paragraph 415.1 of the ASME Code.

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Oconee Containment Liner Plate and Cold Penetration Fatigue Exemption Design Inputs Oconee UFSAR Section 3.1.49 Design Pressure = 59 psig (conservatively used 60 psig for the evaluation)

Design Temperature = 286°F (conservatively used 300°F for the evaluation)

Technical Specification 3.6.4 Operating Pressure = 5 psig As determined from operational data, the maximum average reactor building operating temperature for Oconee Units 1, 2, and 3 is 140°F.

Oconee UFSAR Section 3.8.1.5.3 describes the fatigue loads considered in the design of the containment liner plate and cold penetrations.

The bounding full range temperature and pressure cycles for the Oconee Units is 500 cycles, which includes Type A integrated leak rate tests required by 10 CFR 50, Appendix J.

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Oconee Containment Liner Plate and Cold Penetration Fatigue Exemption ONS Liner Plate and Cold Penetrations Materials of Construction Material of Material Minimum Ultimate Minimum Yield Strength Stress Intensity Construction Strength (psi) (140°F)

(psi)

A36 Carbon Steel Not used as pressure boundary material SA-516 Gr. 70 Carbon Steel 70000 38000 23.22 A-333 Gr. 6 Carbon Steel 60000 35000 20.0 A-155, CM70 Carbon Steel 70000 38000 23.22 SA-106 Gr. C Carbon Steel 70000 40000 23.2 A-350 Gr. LF2 Carbon Steel 70000 36000 22.74 A-234 Gr. WPB Carbon Steel 60000 35000 20.0 SA-182 F304 Stainless Steel 75000 30000 20.0 SA-240 Gr. 316 Stainless Steel 75000 30000 20.0 5

Oconee Containment Liner Plate and Cold Penetration Fatigue Exemption Criteria (a) - Specified number of times (including startup and shutdown) that the pressure will be cycled from atmospheric pressure to operating pressure and back to atmospheric pressure.

Design cycles cannot exceed the number of cycles on the applicable fatigue curve (Figure N-415(a) or (b)) corresponding to an Sa value of 3 times Sm value of Table N-421, N-422, or N-423.

Sa = allowable amplitude of alternating stress intensity, psi Sm = design stress intensity value Design cycles = 500 cycles Applying the associated design inputs results in an allowed cycle value of 1600 which is greater than 500 cycles. Therefore, Criteria (a) is met.

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Oconee Containment Liner Plate and Cold Penetration Fatigue Exemption Criteria (b) - Full Range of Normal Service Pressure Fluctuations Determine the number of fatigue significant pressure cycles based on design pressure and Sa Significant pressure fluctuations are those for which the total excursion exceeds the quantity:

1 3

Sa = allowable amplitude of alternating stress intensity for 500 cycles, psi (Figure N-415(A) or (B))

Sm = design stress intensity value at operating temperature (Table N-421, N-422, and N-423)

Design Pressure = 60 psig Applying the associated design inputs results in a significant pressure fluctuation of 90 psig.

The normal operating pressure and Type A test pressures are less than 90 psig. Therefore, Criteria (b) is met.

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Oconee Containment Liner Plate and Cold Penetration Fatigue Exemption Criteria (c) - Temperature Difference - Normal Operation Startup and Shutdown Determine the number of fatigue significant temperature cycles based on mean operating temperature and Sa Significant temperature differences during normal operation and during startup and shutdown does not exceed:

(2 )

Sa = allowable amplitude of alternating stress intensity at 500 cycles, psi (Figure N-415(A) or (B))

E = Moduli of Elasticity (Table N-427)

= Coefficients of Thermal Expansion (Table N-426)

Applying the associated design inputs results in an allowed temperature difference of 283°F.

Therefore, 500 design cycles from 70°F to 140°F are acceptable and Criteria (c) is met.

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Oconee Containment Liner Plate and Cold Penetration Fatigue Exemption Criteria (d) - Significant Temperature Difference During Normal Service (Operating Transients)

Significant temperature differences during normal operation does not exceed:

(2 )

Sa = allowable amplitude of alternating stress intensity at 500 cycles, psi (Figure N-415(A) or (B))

E = Moduli of Elasticity (Table N-427)

= Coefficients of Thermal Expansion (Table N-426)

A temperature difference shall be considered significant if it exceeds the quantity:

(2 )

S is the value of Sa at 1E6 cycles.

To be significant, a temperature difference value greater than 36°F would be required, thus all 500 cycles are significant. Since the allowed temperature difference is 305°F and the actual temperature difference is 70°F, Criteria (d) is met. 9

Oconee Containment Liner Plate and Cold Penetration Fatigue Exemption Criteria (e) - Significant Temperature Fluctuations - Dissimilar Materials A significant temperature difference fluctuation is defined as a value greater than:

[2 1 1 2 2 ]

Sa = allowable amplitude of alternating stress intensity at 500 cycles, psi (Figure N-415(A) or (B))

E = Moduli of Elasticity (Table N-427)

= Coefficients of Thermal Expansion (Table N-426)

A temperature difference shall be considered significant if it exceeds the quantity:

[2 1 1 2 2 ]

S is the value of Sa at 1E6 cycles.

To be significant, a temperature difference greater than 65°F would be required, thus all 500 cycles are significant. Since the actual temperature difference is 70°F and the allowed temperature difference is 549°F, Criteria (e) is met.

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Oconee Containment Liner Plate and Cold Penetration Fatigue Exemption Criteria (f) - Full Range of Mechanical Loads (Excluding Pressure), must be less than Sa Cycles considered are 7000 cycles and 1E6 Sa value was taken from Figure N-415(A) for both sets of cycles Sa for stainless steel was taken from Figure N-415(B) for comparison.

Carbon steel is the limiting material Penetration loads were reviewed, and the most limiting penetrations were considered for the evaluation.

Electrical penetrations are not subject to attached piping loads and therefore are not limiting to meet this criteria.

Maintaining the penetration loads below the allowable normal and faulted loads results in stresses below the Sa value for the penetration materials, therefore Criteria (f) is met.

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