NSD-NRC-98-5592, Forwards W Response to FSER Open Item 440.790F & Proprietary Rev 2 to WCAP-14727, AP600 Scaling & PIRT Closure Rept, Vols 1 & 2,change Pages.Updating Instructions Included. Proprietary Encl Withheld

Forwards W Response to FSER Open Item 440.790F & Proprietary Rev 2 to WCAP-14727, AP600 Scaling & PIRT Closure Rept, Vols 1 & 2,change Pages.Updating Instructions Included. Proprietary Encl Withheld

ML20217P537
Person / Time
Site:	05200003
Issue date:	02/27/1998
From:	Mcintyre B WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:	Quay T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML19317C967	List: NSD-NRC-98-5592, Forwards W Response to FSER Open Item 440.790F & Proprietary Rev 2 to WCAP-14727, AP600 Scaling & PIRT Closure Rept, Vols 1 & 2,change Pages.Updating Instructions Included. Proprietary Encl Withheld
References
NSD-NRC-98-5592, NUDOCS 9803100315
Download: ML20217P537 (11)

Text

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Westinghouse Energy Systems Bm 355 Electric Corporation Pinsburgh Pennsylvania 15230-0355 DCP/NRC1275 NSD-NRC-98-5592 Docket No.: 52-003 February 27,1998 1

Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 ATTENTION: T. R. QUAY

SUBJECT:

WCAP-14727, "AP600 SCALING AND PIRT CLOSURE REPORT", REVISION 2

Dear Mr. Quay:

Enclosed is the Westinghouse response to FSER Open item 440.790F. Also enclosed are change pages for WCAP-14727, Revision 2, "AP600 Scaling and PIRT Closure Report", dated l'ebrua:y,1998. A roadmap is included with instructions for inserting the change pages into Revision i of WCAP-14727. This report concludes that data obtained from the Westinghouse tests of the AP600 Passive Core Cooling Systems are suitable for validating the safety analysis codes used to assess the performance of these systems. Pending feedback from the ongoing NRC review and detailed checking of support calculations, no future revisions are planned.

s S

Westinghouse has revised the AP600 Scaling and PIRT Closure Report to address FSER Open items 440.790F and 440.796F, parts e and d. Add.tionally, comments n'ade by members and consultants of the Thermal flydraulic Phenomena Subcommittee of the Advisory Committee on Reactor Safeguards during meetings held on December 9-10,1997 have been considered in t'ils revision.

This report cubmittal closes, from Westinghouse' perspective, OITS Item 6441. As a result, the Westinghouse status column will be changed to " Closed",in the Open item Tracking Systen (OITS).

The NRC should review this response and inform Westinghouse of the status of this open items to be designated in the "NRC Status" column of the OITS.

Please contact Mr. Eugene J. Piplica at (412) 374-5310 if you have any questions concerning this

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transmittal.

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Brian A. h cintyre, Man ger Advanced Plant Safety and Licensing

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DCP/NRCl275 NSD-NRC-98-5592 February 27,1998 Enclosures cc:

W.C. Iluffinan, Jr., NRC (5 copies enclosures)

A. E. Levin, NRC (enclosures)

P.A. Goehnert, ACRS (10 copies enclosures)

N. J. Liparulo, Westinghouse (w/o enclosures)

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Enclosure to Westinghouse Letter DCP/NRCl275 February 27,1998 i,,n

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FSER Open it:m 2=

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FSER Open Item 440.790F Revised Response (OITS #6447)

The scope, organization, and content of the "AP600 Scaling and PIRT Closure Report," WCAP-14727 was also discussed at the December 9-10,1997, meeting between the staff, Westinghouse, and the ACRS Subcommittee on Thermal-Hydraulic Phenomena. Westinghouse should tuvise the report to address ACRS comments, including:

(a) correction of errors in equations;

. (b) correction (if necessary), comple'e discussion, and justification of assumptions and/or specific models used in data assessment, determination of scaling parameters, and "pi" group evaluations, (c) in the specific case of OSU/ APEX scaling, performance of a multi-loop scaling analysis, or an alternative quantitative assessment, to demonstrate that the facility is appropriately scaled for the thermal-hydraulic phenomena and syst:m behavior occurring during the transition from the end of the ADS blowdown period to the inception of IRWST injection (e.g., Gow split between ADS-1/2/3 and ADS-4 valves, pressurir-r draining behavior, CCFL in the pressurizer surge line, overall system depressurization behavior), to provide confidence that these data can be used to assess design-basis-accident analysis computer codes used for the AP600 plant.

Revision of WCAP-14727 to address these issues is an Open Item.

Response

1 Rc;pcasca esc presidcd ;c i;cnis (s) end (b) Only. I;cni (c) v.ili bc inceryere;cd in I'cVision 2 ef I "/CAI'-l4272. Revision 2 of WCAP-14727 wiH includes 1) the changes made in response to FSER Open Item 440.747F previously submitted to the staff in letter DCP/NRCl257 dated February 13, i 1998, 2) the changes described in items a) and b) below as previously prorided in our letter i DCP/NRCl261, dated February 18,1998,3) futme changes made as a result of the <caling analysis

! performed in response to item (c) of this FSER open item and 4) responses tofour OIU RAls submitted to the staff since Revision I was issued.

(a) Equation 3-63 on page 3-33 of WCAP-14727, Revision 1, has been modified to incorporate the comments from the ACRS Subcommittee on Thennal-Hydraulic Phenomena meeting held on December 9-10,1997 regarding the correctness of this egntion. Equation 3-33 has been corrected to include all the terms in the denominator as derived by Wallis and time appropriate reference to Wallis (3-16) has been added.

In addition, Table 3.2-4a has been added to evaluate the terms in the denominator of equation 3-33 over the appropriate range of qualities and pressures for the AP600 and the SPES-2 and OSU test facilities. For this range of qualities and pressures, equation 3-64a which neglects the less important terms in the denominator of equation 3-33, can be justified. However, this approximation (equation 3-64a) is only valid for the ADSl time period. For the ADSl-2 time period, the Dow mixture is of a low quality, equation L64b is approp iate.

t W westinghnuse 440.790F-1 i

{

FSER Open it;m y

As a result, the Pi Group (D m) evaluated based on equation 3-33 in Revision 1 of WCAP-14727 3

is not appropriate for ADSl-2 and has been removed from the System Level Single-Loop Pi Group evaluation and Table E-5. In addition, this Pi Group was developed based on applying the j

momentum equation developed by Wallis to the ADS system only, and is more appropriate as a Bottom-Up Pi Group.

(

i An alternative evaluation of the ADS criticalf7ow scaling has been performed and added to j

Appendix C, section C.I.7 and is referenced in subsection 3.3.2.7, ADSI. This evaluation is i

applicable for ADS 1 and ADSl-2 and is based on the rate of pressure change equation. The I

scaling groups and depressurization system time constant ratios resulting from this evaluation are presented in Appendix C, section C.2.4.1. The scaling ratios show that the SPES facility is very v ell scaled for the ADS critical flow. OSU is distorted during the ADSl blowdown, but is better scaled for the ADSl-2 blowdown.

(b Corrections and additions have been made to WCAP-14727 Revision 1 to address staff and ACRS comments discussed at the December 9-10, 1997 meeting. The transcript of the meeting was reviewed to identify the comments and a thorough review of the document was performed to verify and correct equations, definitions, internal references and text. As a result, the following modifications have been made to WCAP-14727:

Updatcs and corrections to the Nomenclature descriptions o

Addition of a plot the transient phases used in the scaling approach (Figure E-4) o Corrections to the Pi Group Ratio definitions, e.g., sensible heat rate / core power ratio, in o

Tables E-5 and E-9 and Tables 3.2-7 through 3.2-12.

o Addition of a reference to the appendices in Tables E-6 and E-7 Correction to the appendix references in Tables E-10 through E-16 o

A clarification note is added to Appendix B.2.1 that the Pi groups are fer the multi-160p o

scaling analysis Equation variable definitions at initial conditions were modified in Appendix C, Subsection o

C.2.1.1, Critical Flow, and fl.,, is defined for clarification o Pi 10 in Appendix C, section C.2.6, IRWST, has been re-evaluated using a temperature difference instead of absolute temperature and Umwsts in Table E-15 has been re sed l (c) A multi-path scaling analysis has been performed that demonstrates the OSU and SPES-2 l

facilities are appropriately scaledfor the thermal hydraulic phenomena and system behavior I

during the period after ADS-4 actuation and to the inception ofIRWST injection. This analysis I

models theflow paths that are relevant during this period, including the flow through the hot l

legs, the pressurizer, the ADS-4 valves, the PRHR and the DVI linefrom the IRWST.

l l

A multi-path systems level, top down scaling analysis was performedfor the ADS-4/lRWST l

transition period and the results are documented in Appendix B, " Multi-Loop Scaling." The I

derivation of the equations are given in subsection B.I.3 and the evaluation of the Pi groups are I

in subsection B.2.3 of WCAP 14727. These revisions are provided in Revision 2 change pages i

l in the enclosure to our letter DCP/NRCl27S dated February 27,1998. Time constants and i

W Westingflous0 440.790F-2 l

FSER Open it:m j

l scaling ratios were determined using conservation of mass equation scaling, rate ofpressure l

change equation scaling and momen:um conservatio." equation scaling. The results show that I

the IRWST gravity head is the most important phenomena and that the SPES-2 and OSU i

l facilities are well scaled to the AP600 during this phase of the transient.

l l

The momentum flux through the ADS-4 flow path was also found to be important, therefore, a f

bottom-up component level scaling analysis was performed to evaluate the hot leg to ADS-4 l

phase separation and the results are documented in Appendix C, " Bottom up Scaling." The I

derivation of the equations are given in subsection C.I.8 and the evaluation of the Pi groups are i

in subsection C.2.8 of WCAP-14727. The scaling was performed using the Seeger model of l

Reference 440.790F-1. Preserving the mass flow ratios, the resulting geometric ratios show that I

the SPES 2 and OSUfacilities are well scaled to AP600.

I i

l

References:

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l l 440.790F.I.

W. Seeger, J. Reiman, and U. Muller, "Two Phase Flow in a T. Junction with a l

Hori:ontal inlet," International Journal of Multiphase Flow, Vol 19, No 4, pp. 563 l

573, 1993.

WCAP 14727 Revisions:

l The peyescd ;cvisions Revision 2 changes to WCAP-14727, Rcvis:ca 1 are attached to this RAI response.

l 1

l l

1 W Westinghouse

FSER Cpen it:ns 2m:msm:t 5

l

'.+xd Revisions to WCAP 14727 The fallowing markup pages arc enclosed:

1 Page(s)

Volume 1 Section Descrmtion Cover Page/ spine Volume 1 l

Title Page Volume I I

iii through xxv Table of Contents (Nomenclature cisanges on page xix of Rev I included) l E-6 Executive Summary, Phenomena ident.f; cation and Ranking Table (PIRT)

E-6a Figure E-4 I

E20, E-21 Table E-5 I

E 24, E-25 Tsble ' 6 l

E-32, E-33 Table E-7 E-39 Table E-9 l

E 40, E-41 Table E-10 l

E-42, E-43 Table E-Il l

E 44, E-45 Table E-12 i

E-46 E-47 Table E-13 1

E-48, E-49 Table E-14 i

E 50, E-51 Table E-14 (continued) i E 52, E-53 Table E-15 I

E 54, E-55 Table E-15 (continued) 1 E-56, E-57 Table E-16 3-33 through 3-35 Subsection 3.2.1.3.3 ADS Blowdown 3-61 Table 3,2-7 3-62 Table 3.2-8 3-63 Table 3.2-9 3-64 Table 3.2-10 3 65 Table 3.2-11 3-66 Table 3.2-12 3-140 Subsectian 3.3.2.7.1. ADS Critical Flow 3174 through 3-176 Section 3.4, Comparison of x Groups Evaluated Using Hand Calculations and Test Data 3-177 through 3-180 Table 3.4-1 3-181 Table 3.4-2 3-182. 3-183

."able 3.4-3 3-184 Sevion 3.5, References

[ W85tiflgh00$8 440.790F-4

i FSER Open it;m

uumsma l

Reaisions to WCAP-14727 (Continued) l Page(s)

Volume.' Section Descrintion l

Cover Page/ spine Volume 2 I

Title Page Volume 2 l

lit through xx Tdle of Contents l

A 212 through A 213 OITS 6356 (RAI 440.747F)

I A 214 through A 216 OITS 6447 (RAI 440.790F)

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A-217 through A 220 OITS 3471 (RAI 440.580, Rev.1) - See letter DCP/NRCl277 l

A 221 through A 285 OITS 3A01 (RAI 440.576, Rev.1) - See letter DCP/NRC1277 i

l B-83 through B 99 Appendix B.I.3, Derivation of Equations, ADS-4/lRWST Period l

Bal0O through B 124 Appendix B.2.1, B.2.2 (New page numbers only) l B 125 through B 131 Appendix B.2.3, Evaluation of Pi Groups, ADS-4/lRWST Period l

B-132 Appendix B.3, References (New page nu nbers only) l l

C 21 through C 25 Appendix C.J.7, Derivation of Equations, Alternative ADS Critical Flow l

C 26 through C-28 Appendix C.I.8, Derivation of Equations, Hot Leg / ADS-4 Separation l

C-29 through C-45 Appendix C.2.1 through C.2.3 (New page numbers onl )

l C 46 through C 53 Appendix C.2.4.1, Evaluation of Pi Groups, Alternative ADS Critical Flow I

C 54 through C-60 Appendix C.2.4.2 through C.2.7 (llew page numbers only) l C 61 Appendit C.2.8, Evaluation of Pi Groups, Hot Leg / ADS 4 Phase Separation I

C 62 Appendix C.3, References (New page number only)

W Westinghouse 2.

5

PXS-GSR-020, Rev. 2 4

WCAP-14727 Rev.2 Instructions for Updating Manual Follow the stens below. in 'he order shown. to update your AP600 Scalm nd PIRT Closure Reoort.

Volume I and II. from Revision 1 to Revision 2.

VOLUME 1 Cha::ges REMOVE:

Cover Page/ Spine, Rev.1 INSERT:

Cover Page/ Spine, Rev. 2 REMOVE:

Title Page. Rev.1 INSERT:

Title Page. Rev. 2 Find " Table of Contents" REMOVE:

pages lii through xxiv, Rev.1 INSERT:

pages iii through xxvi, Rev. 2 Find " Executive Summary" REMOVE:

E-5 through E6. Rev.1 INSERT:

E-5 through E6a. Rev.1 REMOVE:

E-21, Rev.1 INSERT:

E-21. Rev. 2 REMOVE:

E-25. Rev.1 INSERT:

E-25, Rev. 2 REMOVE:

E-33, Rev.1 INSERT:

E-33, Rev. 2 INSERT:

E-39 Rev.1 REMOVE:

E-39. Rev. 2 REMOVE:

E-41, Rev.1 INSERT:

E-41, Rev. 2 REMOVE:

E-43 Rev.1 INSERT:

E-43, Rev. 2 REMOVE:

E-45 Rev.1 INSERT:

E-45, Rev. 2 REMOVE:

E-47, Rev.1 INSERT:

E-47 Rcv.2 WCAPI4727A k

PXS-GSR-020, Rev. 2 WCAP-14727. Rev. 2 l

instructions for Updating Manual Volume I(continued)

REMOVE:

E-49 Rev.1 INSERT:

E-49. Rev. 2 REMOVE:

E-51, Rev.1 INSERT:

E-51 Rev.2 REMOVE:

E-52. Rev.1 INSERT:

E-52, Rev. 2 REMOVE:

E-55. Rev.1 INSERT:

E-55 Rev.2 REMOVE:

E-57, Rev.1 INSERT:

E-57. Rev. 2 Find "Section 3.0, Scaling" REMOVE:

Pages 3-33 to 3-36, Rev.1 INSERT:

Pages 3 33 to 3-36,Rev.2 REMOVE:

Pages 3-61 to 3-66, Rev.1 INSERT:

Pages 3-61 to 3-66 Rev. 2

]

REMOVE:

Pages 3 139 & 3140, Rev.1 i

INSERT:

Pages 3-139 & 3-140, Rev. 2 REMOVE:

Paga 3-173 to 3-175 Rev.1 INSERT:

Pages 3-173 to 3-184, Rev. 2

)

VOLUME II Changes REMOVE:

Cover Page/ Spine, Rev.1 INSERT:

Cover Page/ Spine, Rev. 2 REMOVE:

Title Page, Rev.1 INSERT:

Title Page, Rev. 2 Find " Table of Contents" REMOVE:

iii through xix INSERT:

iii through xx i

WCAP14727.dhs

PXS-GSR 020, Rev. 2 WCAP-14727, Rev. 2 Instructions for Updating Manual Volume II(continued)

REMOVE:

A-211. Rev.1 INSERT:

A-211 through A-216a.Rev.2 Find " Appendix B" REMOVE:

B-83 through B-108. Rev.1 INSERT:

B-83 through B 132 Rev.2 Find " Appendix C" INSERT:

C-21 through C-62, Rev. 2 WCAP147214as