ML18310A090

From kanterella
Jump to navigation Jump to search
LLC Response to NRC Request for Additional Information No. 338 (Erai No. 9357) on the NuScale Design Certification Application
ML18310A090
Person / Time
Site: NuScale
Issue date: 10/26/2018
From: Wike J
NuScale
To:
Document Control Desk, Office of New Reactors
References
RAIO-1018-61159
Download: ML18310A090 (15)
v • d • e


Text

RAI0-1018-61159 October 26, 2018 Docket No.52-048 U.S. Nucle*ar Regulatory Commission ATTN: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738

SUBJECT:

NuScale Power, LLC Response to NRC Request for Additional Information No.

338 (eRAI No. 9357) on the NuScale Design Certification Application *

REFERENCE:

U.S. Nuclear Regulatory Commission, "Request for Additional Information No.

338 (eRAI No. 9357)," dated January 12, 2018 The purpose of this letter is to provide the NuScale Power, LLC (Nu Scale) tesponse to the referenced NRC Request for Additional Information (RAI).

The Enclosure to this letter contains NuScale's response to the following RAI Questions from NRC eRAI No. 9357:

  • 06.02.01.01.A-2
  • 06.02.01.01.A-3
  • 06.02.01.01.A-4 NuScale has enclosed a Digital Versatile Disc (DVD), Attachment 1, containing information requested by NRC eRAI 9357.

This letter and the enclosed response make no new regulatory commitments and no rev!sions to any existing regulatory commitments.

If you have any questions on this response, please contact Paul lnfanger at 541-452-7351 or at pinfanger@nuscalepower.com.

Manager, Licensing NuScale Power, LLC Distribution: Gregory Cranston, NRC, OWFN-8G9A Omid Tabatabai, NRC, OWFN-8G9A Samuel Lee, NRC, OWFN-8G9A : Nu Scale Response to NRC Request for Additional Information eRAI No. 9357 : Information Relevent to RAI Response No. 338, eRAI 9357 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvalis, Oregon 97330, Office: 541.360.0500, Fax: 541.207.3928 www.nuscalepower.com *-*

RAI0-1018-61159 :

NuScale Response to NRG Request for Additional Information eRAI No. 9357 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvalis, Oregon 97330, Office: 541.360.0500, Fax: 541.207.3928 www.nuscalepower.com

Response to Request for Additional Information Docket No.52-048 eRAI No.: 9357 Date of RAI Issue: 01/12/2018 NRC Question No.: 06.02.01.01.A-2 NPM Containment DBA Analyses To meet the General Design Criteria (GDCs) 16, 38, and 50 relevant to the containment design basis and guided by the Standard Review Plan (SRP), the staff is reviewing the applicant's analytical models and analysis results that are used for the licensing-basis safety analyses.

Specifically, Jhe staff needs to assess the conservatism of the licensing-basis models, constitutive/closure relations, and model input parameters used for the applicant's NPM design basis accident (OBA) containment response analyses, in order to conclude that the results are valid over the applicable range of OBA conditions.

In order to establish the peak calculated containment pressure and temperature, Table 3-3 in the Containment Response Analysis Methodology Technical Report (TR-0516-49084-P, Revision 0) describes five cases of primary system mass and energy release used to calculate the maximum containment (CNV) pressure and maximum containment wall temperature for each case. The staff identified additional information that is needed to perform smart-samples for confirmatory and sensitivity CNV analyses to support making safety findings regarding the NuScale design under OBA conditions. To accomplish this, the staff is focusing on modeling the CNV decoupled from the reactor pressure vessel (RPV) and, rather, using the NuScale-provided mass and energy rates into and out of the CNV as prescribed boundary conditions. In this regard, NuScale is requested to address the following questions regarding the peak containment pressure and wall temperature modeling and the corresponding mass and energy rates. This information may be provided for audit. As part of the audit, the staff may identify information that is necessary for docketing or incorporation in FSAR. The regulatory bases identified above are applicable to all questions in this RAI.

NuScale Nonproprietary

Provide the containment mass and energy rate (i.e., mass per unit time and energy per unit time) of addition to the containment through the discharge point(s) from the reactor coolant system (RCS), and the return from the containment to the RCS through the point(s) of return for each of Cases 1 through 5, which describe transients in which the load originates in the primary-side. Similarly, address the two cases of sources originating in the secondary side (i.e., main steam line and feedwater line break cases). Provide separately the contributions of water and steam (and fog, if modeled). For clarity, the staff requests this information to be provided in the following manner:

a. In general, provide two sets of files per case, where each set corresponds to the values for the conditions assigned to yield: 1) the case-maximum containment pressure, and 2) the case-maximum containment wall temperature.
b. For distinct locations/sources that contribute to the mass and energy release, provide the data separately. For example, contributions of several RWs, or likewise the contribution of several RRVs, may be lumped. However, the data for lumped RWs and RRVS should not be further combined. Similarly, provide separately the contribution of any broken line, or, generally, the contribution from any functionally and elevationally distinct location. Also, include contributions that may be negative (e.g., long-time RRV flows may be from the containment vessel to the pressure vessel).
c. Provide the data in the form of Excel spreadsheets or the equivalent. Use a fine plotting interval. One plot point per second is suggested. If a still finer interval provides valuable insights, provide the data (e.g., within 30 seconds) of the substantive time of the opening of a valve or the initiation of a break.

NuScale Response:

The requested data is transmitted to the NRC via Digital Versatile Disc (DVD) as an enclosure to the response letter to this eRAI response.

The DVD contents include an Excel spreadsheet that provides the following data at one second intervals from event initiation until the peak pressure is reduced to 50% of its maximum value:

NuScale Nonproprietary

RCS Discharge Line Break Event

1. RW liquid, gas mass and energy release rates (peak pressure case)
2. RRV liquid, gas mass and energy release rates (peak pressure case)
3. RW noncondensable mass and energy release rates
4. RRV noncondensable mass and energy release rates (peak pressure case)
5. Break liquid, gas mass and energy release rates (peak pressure case)
6. Break noncondensable mass and energy release rates (peak pressure case)
7. Total mass and energy release rates (peak pressure case)
8. CNV total liquid mass (peak pressure case)
9. RW liquid, gas mass and energy release rates (peak temperature case)
10. RRV liquid, gas mass and energy release rates (peak temperature case)
11. RW noncondensable mass and energy release rates (peak temperature case)
12. RRV noncondensable mass and energy release rates (peak temperature case)
13. Break liquid, gas mass and energy release rates (peak temperature case)
14. Break noncondensable mass and energy release rates (peak temperature case)
15. Total mass and energy release rates (peak temperature case)
16. CNV total liquid mass (peak temperature case)

Injection Line Break Event

1. RW liquid, gas mass and energy release rates (peak pressure case)
2. RRV liquid, gas mass and energy release rates (peak pressure case)
3. RW noncondensable mass and energy release rates
4. RRV noncondensable mass and energy release rates (peak pressure case)
5. Break liquid, gas mass and energy release rates (peak pressure case)
6. Break noncondensable mass and energy release rates (peak pressure case)
7. Total mass and energy release rates (peak pressure case)
8. CNV total liquid mass (peak pressure case)
9. RW liquid, gas mass and energy release rates (peak temperature case)
10. RRV liquid, gas mass and energy release rates (peak temperature case)
11. RW noncondensable mass and energy release rates (peak temperature case)
12. RRV noncondensable mass and energy release rates (peak temperature case)
13. Break liquid, gas mass and energy release rates (peak temperature case)
14. Break noncondensable mass and energy release rates (peak temperature case)
15. Total mass and energy release rates (peak temperature case)
16. CNV total liquid mass (peak temperature case)

NuScale Nonproprietary

High Point Vent Line Break Event

1. RW liquid, gas mass and energy release rates (peak pressure case)
2. RRV liquid, gas mass and energy release rates (peak pressure case)
3. RW noncondensable mass and energy release rates
4. RRV noncondensable mass and energy release rates (peak pressure case)
5. Break liquid, gas mass and energy release rates (peak pressure case)
6. Break noncondensable mass and energy release rates (peak pressure case)
7. Total mass and energy release rates (peak pressure case)
8. CNV total liquid mass (peak pressure case)
9. RW liquid, gas mass and energy release rates (peak temperature case)
10. RRV liquid, gas mass and energy release rates (peak temperature case)
11. RW noncondensable mass and energy release rates (peak temperature case)
12. RRV noncondensable mass and energy release rates (peak temperature case)
13. Break liquid, gas mass and energy release rates (peak temperature case)
14. Break noncondensable mass and energy release rates (peak temperature case)
15. Total mass and energy release rates (peak temperature case)
16. CNV total liquid mass (peak temperature case)

Inadvertent Opening of an RW Event

1. RW liquid, gas mass and energy release rates (peak pressure case)
2. RRV liquid, gas mass and energy release rates (peak pressure case)
3. RW noncondensable mass and energy release rates
4. RRV noncondensable mass and energy release rates (peak pressure case)
5. Break liquid, gas mass and energy release rates (peak pressure case)
6. Break noncondensable mass and energy release rates (peak pressure case)
7. Total mass and energy release rates (peak pressure case)
8. CNV total liquid mass (peak pressure case)
9. RW liquid, gas mass and energy release rates (peak temperature case)
10. RRV liquid, gas mass and energy release rates (peak temperature case)
11. RW noncondensable mass and energy release rates (peak temperature case)
12. RRV noncondensable mass and energy release. rates (peak temperature case)
13. Break liquid, gas mass and energy release rates (peak temperature case)
14. Break noncondensable mass and energy release rates (peak temperature case)
15. Total mass and energy release rates (peak temperature case)
16. CNV total liquid mass (peak temperature case)

NuScale Nonproprietary

Inadvertent Opening of an RRV Event

1. RW liquid, gas mass and energy release rates (peak pressure case)
2. RRV liquid, gas mass and energy release rates (peak pressure case)
  • 3. RW noncondensable mass and energy release rates
4. RRV noncondensable mass and energy release rates (peak pressure case)
5. Break liquid, gas mass and energy release rates (peak*pressure case)
6. Break noncondensable mass and energy release rates (peak pressure case)
7. Total mass and energy release rates (peak pressure case)
8. CNV total liquid mass (peak pressure case)
9. RW liquid, gas mass and energy release rates (peak temperature case)
10. RRV liquid, gas mass and energy release rates (peak temperature case)
11. RW noncondensable mass and energy release rates (peak temperature case)
12. RRV noncondensable mass and energy release rates (peak temperature case)
13. Break liquid, gas mass and energy release rates (peak temperature case)
14. Break noncondensable mass and energy release rates (peak temperature case)
15. Total mass and energy release rates (peak temperature case)
16. CNV total liquid mass (peak temperature case)

Main Steamline Break Event

1. RW liquid, gas mass and energy release rates (peak pressure case)
2. RRV liquid, gas mass and energy release rates (peak pressure case)
3. RW noncondensable mass and energy release rates
4. RRV noncondensable mass and energy release rates (peak pressure case)
5. Break liquid, gas mass and energy release rates (peak pressure case)
6. Break noncondensable mass and energy release rates (peak pressure case)
7. Total mass and energy release rates (peak pressure case)
8. CNV total liquid mass (peak pressure case)
9. RW liquid, gas mass and energy release rates (peak temperature case)
10. RRV liquid, gas mass and energy release rates (peak temperature case)
11. RW noncondensable mass and energy release rates (peak temperature case)
12. RRV noncondensable mass and energy release rates (peak temperature case)
13. Break liquid, gas mass and energy release rates (peak temperature case)
14. Break noncondensable mass and energy release rates (peak temperature case)
15. Total mass and energy release rates (peak temperature case)
16. CNV total liquid mass (peak temperature case)

NuScale Nonproprietary

Main Feedwater Line Break Event

1. RW liquid, gas mass and energy release rates (peak pressure case)
2. RRV liquid, gas mass and energy release rates (peak pressure case)
3. RW noncondensable mass and energy release rates
4. RRV noncondensable mass and energy release rates (peak pressure case)
5. Break liquid, gas mass and energy release rates (peak pressure case)
6. Break noncondensable mass and energy release rates (peak pressure case)
7. Total mass and energy release rates (peak pressure case)
8. CNV total liquid mass (peak pressure case)
9.
  • RW liquid, gas mass and energy release rates (peak temperature case)
10. RRV liquid, gas mass and energy release rates (peak temperature case)
11. RW noncondensable mass and energy release rates (peak temperature case)
12. RRV noncondensable mass a.nd energy release rates (peak temperature case)
13. Break liquid, gas mass and energy release rates (peak temperature case)
14. Break noncondensable mass and energy release rates (peak temperature case)
15. Total mass and energy release rates (peak temperature case)
16. CNV total liquid mass (peak temperature case)

Impact on DCA:

There are no impacts to the DCA as a result of this response.

NuScale Nonproprietary

Response to Request for Additional Information Docket No.52-048 eRAI No.: 9357 Date of RAI Issue: 01/12/2018 NRC Question No.: 06.02.01.01.A-3 Some data have been provided on containment water depth, however, supplement these data with containment water mass to address the five cases of TR-0516-49084-P wherein the source is the primary RCS, and also to the main steam line and feedwater line break cases of TR-0516-49084-P.

NuScale Response:

The requested data is transmitted to the NRC via Digital Versatile Disc (DVD) as an enclosure to this eRAI response .

The DVD contents include an Excel spreadsheet that provides containment total liquid mass at one second intervals from event initiation until the peak pressure is reduced to 50% of its maximum value for the peak pressure and temperature cases for each event.

Impact on DCA:

There are no impacts to the DCA as a result ofthis response.

NuScale Nonproprietary

Response to Request for Additional Information Docket No.52-048 eRAI No.: 9357 Date of RAI Issue: 01/12/2018 NRC Question No.: 06.02.01.01.A-4 For the staffs better understanding of the Case 5 accident progression due to inadvertant opening of the RRV, please provide the reason(s) for the increasing containment vapor temperature in Figure 5-31 during the period of zero to 50 seconds that precede the transient.

NuScale Response:

The cause of the steadily increasing CNV vapor temperature in TR-0516-49084, Rev. 0, Figure 5-31 was an error in the initial containment vessel (CNV) atmosphere pressure conditions specified during the 50 seconds prior to the inadvertent opening of an RRV (Case 5) event.

Specifically,the initial pressure was unintentionally reset to 1.0 psia at the start of the transient run instead of the 2.0 psia initial CNV pressure value listed in Containment Response Analysis Methodology Technical Report, TR-0516-49084, Rev. 0, Tables 3-5 and 5-1.

The above described error has been entered into the NuScale Corrective Action Program. The updated containment response analysis of record resolves this error by correcting the CNV initial conditions to maintain a consistent increased CNV internal pressure of 3.0 psia, as discussed by eRAI 9482, Question 06.02.01.01.A-18 (letter RAI0-1018-62335 dated October 26, 2018), for the time period from steady state initialization through event initiation. Steady state conditions, including a steady CNV internal pressure of 3.0 psia, are successfully reached during the CNV analysis model steady state runs, as demonstrated by the the figures below depicting primary and secondary event steady state initial conditions, prior to transient initiation. Also, all primary side and secondary side transient events are now initiated at time zero reducing the probability of unintentionally re-initializing a particular model parameter.

NuScale Nonproprietary

Correction of the above error resolves the steadily increasing CNV vapor temperature, observed in TR-0516-49084 , Rev. 0, Figure 5-31 , prior to the initiation of the transient. The update to TR-0516-49084 , Figure 5-31 depicts the CNV vapor temperature response following event initiation at O seconds into the transient run.

10

-Cl!

"cij

.3, 9

8 Q)

J 7

(/)

(/)

Q)

'- 6 a..

roC: 5 Q) c 4 z 3 C) x Cl!

2

~

0 1000 2000 3000 4000 5000 6000

. Time (sec)

Ss .pn SS .pri .rad -+-

SS .pri.cnvALLc --M- SS .pri.cnvALLf.RFlo .ffout ---

SS .pri.cnvALLf _.,_ SS.pri.cnvALLf.ffout -+--

SS .pri .pool28 -e- SS.pri. ffout --M-SS.pri .cnvALLf.pool28 - SS.pri.cnvH Sf _.,_

SS.pri.R Fh i ~ SS.pri.cnvALLf.cnvHSf -e-SS .pri.RFlo - SS .pri.cnvALLf.cnvHSf.pool28 -

SS .pri.cnvALLf.RFh i __.,_ SS .pri.cnvALLf.cnvHSf.RFhi ~

SS .pri.cnvALLf.RFlo _....._ SS .pri .cnvALLf.cnvHSf.ffout -

SS.pri.cnvALLf.pool28.RFhi -T- SS.pri.cnvALLf.cnvHSf.pool28.RFlo __.,_

SS.pri. cnvALLf.pool28.RFlo --.- SS.pri .cnvALLf.cnvHSf.pool28.RFlo.ffout ---

SS .pri.pool28.RFh i _..,_ SS.pri. pool28.cnvHSf.RFlo _...,._

SS .pri.pool28.RFlo Primary Side Event Steady State Initial Conditions - Max CNV Internal Pressure NuScale Nonproprietary

10 9 -

ro "iii

.e 8 -

Q)

, 7 -

(/)

(/)

Q) a..

6 -

ro 5 -

C:

Q)

C: 4 -

z 3

(.)

x cu 2 -

~

1 -

0 1000 2000 3000 4000 5000 6000 ss .sec T\me (sec) SS .sec.cnvALLf.pool28.RFhi -+-

SS .sec.cnvALLc -M-- SS .sec.cnvALLf.pool28.RFlo SS .sec.cnvALLf ---- SS .sec.pool28.RFlo ---+-

SS .sec.pool28 -a-- SS .sec.norad -

SS .sec .cnvALLf.pool28 - SS .sec.ffout -+--

SS .sec.RFhi -e- SS .sec.cnvHSf -M--

SS .sec.RFlo - SS .sec.cnvALLf.cnvHSf ----

SS.sec.cnvALLc.RFhi _..,_ SS .sec.cnvALLf.cnvHSf.poo l28 -a--

SS.sec.cnvALLc.RFlo __._ SS .sec.cnvALLf.cnvHSf.pool28.RFlo -

SS.sec .cnvALLf.RFh i -....- SS.sec.pool28.cnvHSf.RFlo -e-SS .sec.cnvALLf.RFlo ___.

Secondary Side Event Initial Conditions - Max CNV Internal Pressure Impact on DCA:

Technical Report, Containment Response Analysis Methodology, TR-0516-49084 ,

Figure 5-31 has been revised as described in the response above and as shown in the markup provided in this response.

NuScale Nonproprietary

Containment Response Analysis Methodology Technical Report TR-0516-49084-NP Draft Rev. 14}

1000 I I I I I I I I 900 -

U:::-

o 800 -

700 -

600 -

500 -

400 ..._~~__,_*~~~-..__'~~--~~~-..__*~~--~~~-..__*~~--~~~_._*~~~

0 200 400 600 800 1000 1200 1400 1600 Time (sec)

Figure 5-31 Case 5 containment vessel vapor temperature - inadvertent reactor recirculation valve opening event

© Copyright 2018 by NuScale Power, LLC 109

RAI0-1018-61159 :

Information Relevant to RAI Response No. 338, eRAI 9357 NuScale Power. LLC 1100 NE Circle Blvd., Suite 200 Corvalis, Oregon 97330, Office: 541.360.0500, Fax: 541.207.3928 www.nuscalepower.com

RAI0-1018-61159 Attachment 1:

List of Proprietary Documents Provided via DVD No. File Requested NuScale Response 1 MEtables.xls Included on DVD.

2 C9A6A37738E57EA7D49C4C81B2B8F7A77BAA9D9AOD574E9CF7D Hash file B08270D1AB5F4D4424312B8E97A8EB9CF75761C8A4DD7244D315 A4A9553B943B119C51CAF1954 NuScale Power, LLC 1100 NE Circle Blvd., Suite 200 Corvallis, Oregon 97330 Office 541.360-0500 Fax 541.207.3928 www .nuscalepower.com

Retrieved from "https://kanterella.com/w/index.php?title=ML18310A090&oldid=2526708"