LTR-BWR-ENG-14-043-NP, 'Responses to the US NRC Request for … · 2014-10-06 · Westinghouse...

L-MT-14-075

ENCLOSURE 7

WESTINGHOUSE LETTER REPORT, LTR-BWR-ENG-14-043-NPNON-PROPRIETARY

RESPONSES TO THE US NRC REQUEST FOR ADDITIONAL INFORMATIONRELATIVE TO THE MONTICELLO REPLACEMENT STEAM DRYER

ACOUSTIC/STRUCTURAL ANALYSES SET #8

24 pages follow

Westinghouse Non-Proprietary Class 3

LTR-BWR-ENG-14-043-NP

Responses to the US NRC Request for Additional

Information Relative to the Monticello

Replacement Steam Dryer Acoustic/Structural

Analyses Set #8

September 19, 2014

Westinghouse Electric Company LLC1000 Westinghouse Drive

Cranberry Township, PA 16066 USA

© 2014 Westinghouse Electric Company LLCAll Rights Reserved

Westinghouse Non-Proprietary Class 3LTR-BWR-ENG-14-043-NP

MNGP EPU-EMCB-RSD-RAI-121

Question:

The NRC staff has reviewed the information provided in draft letter L-MT-14-075. Theinformation in L-MT-14-075 will provide NSPM's (the licensee) response to previously issueddraft requests for additional information MNGP EPU-EMCB-RSD-RAI-120. The staff notes thatin the data collected at MNGP in 2014, some of the main steam line (MSL) strain gage (SG)channels were not functioning; however, all of the MSL SG channels were active in datacollected in 2011. The NRC staff also notes that there were some differences in MSL PowerSpectral Plots (PSDs) between the 2011 and 2014 data and, therefore, requests that thelicensee develop [[

]] The NRC staff request the licensee provide thefollowing additional information outlined below.

Please revise the [[ ]] as follows, and provide the followinginformation:

a) Revise the 2011 MSL PSD plots using [[I].

b) Perform the stress analysis using the [[revised MSL time histories]], and provide the results.

c) Compare the [[]].

d) Provide a comparison between the revised B/Us and the original B/Us.

e) Provide comparisons between the 2011 and 2014 PSDs of the [[]] (similar to those shown in Figures 9 to 16 of draft letter L-

MT-14-075. The PSDs used in these comparisons should be derived from the [[

1]]

f) Provide a table of [[ ]]. If theyare different, then provide a comparison with the ones used for determining the originalB/Us.

I

Westinghouse Non-Proprietary Class 3LTR-BWR-ENG- 14-043-NP

Response:

a) Plots of the 2011 MSL pressure PSDs were generated with only the active strain gage (SG)channels that remain active in 2014.

a,c

Table 1Stop Band Filtered Frequencies

a,b,c

b) The dryer was analyzed using the revised

c) [

]a,c

a,b,c

2


d)

Ia,c

b,c

b,c

The difference in the B/Us is shown in the table below.

3

Westinghouse Non-Proprietary Class 3LTR-BWR-ENG- I 4-043-NP

e) Figures 1 through 8 contain PSDs that compare

Ia,c

a,b,c

Figure 1: MSL A SG Upstream 2011 vs 2014

4


a,b,c

Figure 2: MSL A SG Downstream 2011 vs 2014

5


a,b,c

Figure 3: MSL B SG Upstream 2011 vs 2014

6


a,b,c

Figure 4: MSL B SG Downstream 2011 vs 2014

7


a,b,c

Figure 5: MSL C SG Upstream 2011 vs 2014

8


a,b,c

Figure 6: MSL C SG Downstream 2011 vs 2014

9


a,b,c

Figure 7: MSL D SG Upstream 2011 vs 2014

10


a,b,c

Figure 8: MSL D SG Downstream 2011 vs 2014

II


f) The acoustic modeling parameters were not changed. ACE+SPM parameters were notchanged since the model was benchmarked using Quad Cities data.

Parameter ACE Revision 2.0.1 1

a,b,c

12


Clarification Questions

On September 3, 2014, a teleconference was held between the NRC staff and NSPM to discussthe information being provided in draft letter L-MT-14-075. The teleconference offered thelicensee an additional opportunity to request any additional clarifications from the NRC staff.Additionally, the teleconference allowed the NRC staff an opportunity to request additionalclarification questions to assist completing its review of the licensee's response to MNGP EPU-EMCB-RSD-RAI-120. The clarification questions are provided below:

1. Please provide a table of individual sensors used in [[ 1] 2011 and 2014. [[

I]

]a,c

ac

]a,c

13


Table 2Channel Names and SG locations 7a,b,c

14


2. Please provide root mean square (RMS) and peak values for [[

]].

IIa,c

Table 3Stop Band Filtered Frequencies

a,b,c

Table 4 provides the RMS and peak values for all eight MSL locations (after filteringelectrical and VPF peaks). The 85 Hz peak appeared only in the 2011 MSL A SG data, thusit is only filtered from the MSL A SG signals as noted in Table 4.

Table 4MSL SG RMS (psid) and Peak (psid 2/Hz) Values

a,b,c

15


3. Please provide histograms of the 2011 and 2014 [[]]. Show the histograms on common scales, with

percent of total occurrences on the y-axis. Provide histograms for the full frequency range,as well as for signals below 100 Hz only.

Figures 9A through 9D shows histograms for the 2011 and 2014 time histories

Ia,c

a,b,c

Figure 9A Histograms for 2011 and 2014 MSL A Time HistoriesNo low pass filter applied

16


a,b,c

Figure 9B Histograms for 2011 and 2014 MSL B Time HistoriesNo low pass filter applied

17


Figure 9C Histograms for 2011 and 2014 MSL C Time HistoriesNo low pass filter applied

a,b,c

18

Westinghouse Non-Proprietary Class 3LTR-B WR-ENG- 14-043-NP

Figure 9D Histograms for 2011 and 2014 MSL D Time HistoriesNo low pass filter applied

a,b,c

19


a,b,c

Figure 10A Histograms for 2011 and 2014 MSL A Time HistoriesLow Pass Filter at 100 Hz applied

20


a,b,c

Figure 1OB Histograms for 2011 and 2014 MSL B Time HistoriesLow Pass Filter at 100 Hz applied

21


a,b,c

Figure IOC Histograms for 2011 and 2014 MSL C Time HistoriesLow Pass Filter at 100 Hz applied

22

Westinghouse Non-Proprietary Class 3LTR-BWR-ENG-14-043-NP

a,b,c

Figure IOD Histograms for 2011 and 2014 MSL D Time HistoriesLow Pass Filter at 100 Hz applied

4. Please provide summed time histories in Matlab format for signals between 2 and 250 Hz, [[

1].

Filtered time histories for the 2011 and 2014 MSL A upper and lower locations usingconsistent strain gauge inputs will be provided.

23

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