Enclosure 1 to Serial: NPD-NRC-2015-020Page 1 of 23

Enclosure IAPIOOO® IRWST Condensate Return (Non-Proprietary)

(23 pages including cover page)

Wetigouse No-Prpitr Cls 3 D 201 Wetngos Elcti Co pn 0 Al Riht Reere.

This is the nonproprietary version of these slides.

(• Westinghouse

WGOTHIC, APIOO0 and the API000 logo are trademarks or registered trademarks of Westinghouse Electric

Westingrhouse Company LLC, its subsidiaries and/or its affiliates in the United States. These marks may also be used and/orregistered in other countries throughout the world. All rights reserved. Unauthorized use is strictly prohibited.

2

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" Status of Calculations" Summary of Major Changes" Analysis Results" Licensing Basis Changes" Long Term Analysis Finalization

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Wetnghus No-roretr Cls i D 2015Westinghous EI'l[etic • Compan LLC ll Riht Reserved,•

Initialization Inputs:" Bounding PRHR HX heat transfer" RV downcome_.temperature

IN

APP-PXS-M3C-071 /

9

0

0

0

Confirmationof acceptablelosses

II Cont. pres/temp

CV steam cond. Ratessteam to coit atmsteam to passive heat sinksleakage

IRWST Steaming RatePXS Condensate Flow RatePXS Condensate TemperatureContainment Pressure

APP-SSAR-GSC-536

Calc output-- •Bounding output

APP-SSAR-GSC-009(Due 6/15/15)

FinalResults

1. DBA Extensionm 72 hours with Chapter 15

acceptance criteria2. Time to Safe Shutdown

• Demonstration of 420OF in 36hours or less

3. Safe Shutdown Duration* Demonstration of less than

420°F for greater than 14 days

APP-PXS-M3C-072

(*) Westinghouse4 l caclain suprig ae

4

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" Analysis approach was developed over time- PRHR Performance (APP-PXS-M3C-020) calculation already

existed- Time to Safe Shutdown (APP-SSAR-GSC-536) built off of existing

PRHR calc- When Condensate Return Issue surfaced, containment effects

(APP-PXS-M3C-071) and condensate losses (APP-PXS-M3C-072)were added at the front end of the process

" Original analysis approach was required to analyze largefluctuations in varying condensate return rates

" Design change to add gutters & downspouts provides moreconsistent losses- Losses are sufficiently reduced / consistent to utilize WGOTHIC

calculation

(• Westinghouse5

* Calculations available for audit- APP-PXS-M3C-071 (WGOTHIC Containment Analysis)- APP-PXS-M3C-072 (Condensate Losses)- APP-SSAR-GSC-536 (LOFTRAN Safe Shutdown Analysis)

* Licensing documentation submitted- APP-GW-GLR-161 (proprietary)

0 APP-GW-GLR-607 (non-proprietary)

- RAI 6.03-13 Response* Condensate Return Transient Return Rate Differences

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* Changes since last revision- Utilization of WGOTHIC code version 4.3.1

• Corrects code error associated with incorrect heat transfer on driedout portions of containment vessel exterior

- Incorrect steam table was called out within code to calculate saturationpressure

- Additional sensitivities* Use of ORIGEN-S decay heat to show additional margin• Higher humidity evaluation* Reactor vessel steaming sensitivity* PRHR tube plugging margin

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t.• WestinghouseWGOTHIC analysis relativelyunchanged since last revision

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* Changes since last revision- Incorporation of outstanding design changes associated with

finalized attachment plates inside containment- Reference to RAI 6.03-5 response regarding containment

temperature extrapolation- Analysis being used to confirm 18% condensate loss

• Maximum 18% loss conservatively assumed for duration oftransient in WGOTHIC (APP-PXS-M3C-071) calculation

- Additional sensitivities* Use of ORIGEN-S decay heat to show additional margin* Holdup volume calculation added in response to RAI 6.03-3

(• Westinghouse

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* Changes since last revision- DBA Extension case provided in RAI 7440 (15.02.06-2) is

now incorporated into Appendix D- Use of LOFTRAN version 15.2.0, which incorporates single

application features introduced in prior revisions of analysis

- Additional sensitivities* Use of ORIGEN-S decay heat to show additional margin* Evaluation of additional margin within calculation* PRHR tube plugging margin* Evaluation of updated LOFTRAN base decks

- DOD R. 19 versus expected future changes

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Westinghouse Non-Proprietary Class 3 (D 2015 Westinghouse Electric Company LLC. All Rights Reserved.

Design Basis Extension AnalysisPressurizer Volume

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" Revised licensing basis markups were incorporated into thefollowing sections:- Section 7.4- Section 19E.4.10.2- Figures 19E.4.10-1, 10-2, 10-3, 10-4- Table 19E.4.10-1

" Updated descriptions of supporting calculations" Addition of discussion about DBA extension evaluation* Calculation inter-relationships diagram update" Safe Shutdown temperature evaluation (420TF in 36 hours)

is described as a licensing performance criterion rather thana safety evaluation

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sumta ar imace by th -open

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ILlong i! iiTermi Ana'f~lysi Planl

3/2-3/20I Weels I

3/23 -4/103 Weeks 4/13

Decmsic Point4114-6/15

8 WeeksI

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availdble fcxNRC Review

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Westinghouse Non-Proprietary Class 3 @ 2015 Westinghouse Electric Company LLC. All Rights Reserved.

Conclusions

" Calculations available for audit- Safe Shutdown acceptance criteria are met- Chapter 15 acceptance criteria are met for 72 hours- Revised analysis had minimal impact on previously submitted

license change package

" Long term calculations in process- Preliminary results showing >14 days below 420IF- No additional licensing markups expected as a result of long

term calculation completion

" No additional physical changes were required

Westinghouse22