TXX-6398, Forwards Addl Info Per NRC 870327 Request Re Util 860613 Response to NUREG-0737 Item II.D.1, Performance Testing of Relief & Safety Valves

Forwards Addl Info Per NRC 870327 Request Re Util 860613 Response to NUREG-0737 Item II.D.1, Performance Testing of Relief & Safety Valves

ML20206P010
Person / Time
Site:	Comanche Peak
Issue date:	04/15/1987
From:	Counsil W, Keeley G TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
RTR-NUREG-0737, RTR-NUREG-737, TASK-2.D.1, TASK-TM TXX-6398, NUDOCS 8704210075
Download: ML20206P010 (24)

Text

a Log # TXX-6398 H

File # 10010 Ref #10CFR50.30(a)

WELECTRIC April 15, 1987 wm c. co-ma mwae N hr.asent U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKETS NOS. 50-445 AND 50-446 REQUEST FOR ADDITIONAL INFORMATION - NUREG-0737, ITEM II.D.1 i PERFORMANCE TESTING OF RELIEF AND SAFETY VALVES l Gentlemen:

By letter dated March 27, 1987, the NRC staff requested additional information f regarding the TV Electric submittal of June 13, 1986, "NVREG-0737, Item II.D.1 -

Performance Testing of Relief and Safety Valves". ,

i j Attached is the information requested.

] Very truly yours, R/Al W. G. Counsil By: N, 6[

G. S. Keeley '-

Manager, Nuclear k ensing BSD/amb Attachment

, c - Mr. E. II. Johnson, Region IV  ;

Mr. D. L. Kelley, RI - Region IV  !

Mr.11. S. Phillips, RI - Region IV

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i B704210075 870415 .

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Attachment to TXX-6398

, April 15, 1987 Page 1 of 23 QUESTION 1: Load Combination Ecuation l

In the load combination equation for the emergency service condition given on Page A-12 of Appendix A of Reference 1

[TU Electric letter TXX-4849 dated June 13,1986), the summation of the moment, MWt, due to deadweight, and the moment, MsoIE , due to safety valve discharge, is expressed as MSOTE + lMWtl.

Explain why the absolute value of the deadweight moment is used in this equation. This summation will produce unconservative results when both Ms0T Eand MWt have negative values.

4 RESPONSE 1: The computer program used for the stress evaluations automatically considers the absolute value of the respective moment from the thrust events including SOTE . Consequently, MsoIE is actually the absolute value of MsoIE and has been combined with the absolute value of MWt-

I Attachment to TXX-6398 April 15, 1987 Page 2 of 23 00ESTION 2: Pioina Stress Comnarison A. The piping stress comparison presented in Appendix A of Reference 1 (TV Electric letter TXX-4849 dated June 13, 1986] included the design, fatigue, and faulted condition stresses for the Class 1 (upstream) portion of the safety valve and PORV piping. The upset and emergency condition stresses were not provided. Table A-5 in the above reference showed that the faulted condition stresses were low enough to fall below the emergency condition stress limits. However, it is difficult to draw the same conclusion for the upset condition, since not all of the i stresses listed in Table A-5 are below the upset condition stress limit. The Licensee should provide a stress comparison for the upset condition to demonstrate that the PORY piping stresses are within allowable limits.

B. Reference 1 did not include a stress comparison for the downstream piping. Provide a comparison of the normal, upset, emergency, and faulted condition stresses and the applicable stress limits for the downstream piping in a similar manner as those for Class 1 piping.

C. Provide sketches of the upstream and downstream piping indicating the locations of the structural nodes used in the  !

stress comparisons. ,

RESPONSE 2:

The loadings for the design condition listed in Table A 4 are for the combination P + DWT + SRSS (OBE, 50TV ). Therefore, the normal and upset conditions are automatically covered by the design data in Table A 4 and the emergency and faulted conditions are automatically covered by the faulted data in Table A 5 of the reference.

Attachment to TXX-6398 April 15, 1987 Page 3 of 23 RESPONSE 2: Since the transmittal and review of the reference data, the line (cont'd) has been reanalyzed to reflect pipe support changes. A comparison of the normal, upset, emergency and faulted condition stresses and the applicable stress limits for both the upstream and downstream piping is presented in the attached Tables 2-1 through 2-9 for the revised analysis. Figures A-1 and A 2 illustrate the structural node points and support locations.

. Attachment to TXX-6398 April 15, 1987 Page 4 of 23 OVESTION 3: Pipino Supoort Loads A. The piping support evaluation was performed in accordance with the ASME Boiler and Pressure Vessel Code, Section Ill, Subsection NF. The stress limits listed in Tables A-1 and A-2 (Reference 1) [TU Electric letter TXX-4849 dated June 13,1986) for load combinations for normal, upset, emergency, and faulted conditions appear to be oriented toward pipe stresses only, and not pipo support stresses.

The allowables for the supports would be expected to be multiples of Subsection NF stress limits. Therefore, clarify the stress limits used for the supports for all load combinations. Also, identify the stress limits used for standard components such as snubbers.

B. Present a table comparing the worst caso load (or stress) in several representativo supports with the applicablo allowable load (or stress) and identify the associated load combination equation. Also indicato in the table the support number and support type. If the support numbrr':

l usedinthetablearenotshowninthepipingsketche,lin Figures A 8 through A-13 in Reference 1, provido addstional sketches to identify the support locations.

RI.SPONSE 3: Regarding item 3A, the load combinations and stress allowables for the ASME Code Class 1, 2, and 3 pipo supports are in conformance with Subsection NF of the ASME Section !!! Codo.

This includes standard component supports. Those allowables are tabulated in FSAR Tables 3.90 10, 3.9B 10, and 3.90 lE.

For Item 30, the worst case load / stress versus the allowables for representative pipo supports in Figures A 8 through A 13 are tabulated in Tables 3 1 through 3 6, respectively. Tablo 3 7 contains a similar comparison for small bore pipo supports within the stress problem boundary but not shown in the piping  :

sketches in figures A 8 through A 13 of Referenco 1.

l

Attachment to TXX-6398 April 15, 1987 Page 5 of 23 OVESTI0ff 4: Provide a description of the pipe material for the Class 1

, piping upstream of the valves.

1 RESPONSE 4: The Class 1 piping, por the as built data, is either ASME SA 376 TP304 or TP316 stainless steel. Ilowever, the lower allowable stress values for TP304 are used in the stress analysis.

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Attachment to TXX-6398

. April 15, 1987 Page 6 of 23 Table 2-1 CLASS 1 (UPSTREAM) PRIMARY STRESS

SUMMARY

NORMAL CONDITION COMBINATION: P + DWT Maximum Allowable Stross Node Piping Equation #9 1.5 Sm Point Comoonent Stress (ksi) (ksi) 3 3020 Butt Wold 10.064 24.225 3041 Long Radius Elbow 12.123 24.225 5000 Branch Connection 15.844 24.225 3030 CRUN 9.905 24.225 4332 5 0 Bond 5.384 24.225 4170 Roducer 12.867 24.225 4

i 1

D

, Attachment to TXX-6398 April 15, 1987 Pago 7 of 23 Table 2-2 CLASS 1 (UPSTREAM) PRIMARY STRESS

SUMMARY

UPSET CONDITION COMBINATION: P + DWT + SRSS (OBE. 50TV1 Maximum Allowable Stross Node Piping Equation #9 o y Point Comoonent Stress (ksi) (1.8 Smksi) (r 1.5 S )*

4480 Butt Wold 15.704 26.850 1031 Long Radius Elbow 17.089 26.850 5000 Branch Connection 26.466 26.850 4481 CRUN 15.704 26.850 4332 5 0 Bond 13.625 26.850 4170 Roducer 19.561 26.850

• The smaller of the given allowablo is to be used.

, Attachment to TXX-6398 April 15, 1987 Page 8 of 23 Table 2-3 CLASS 1 (UPSTREAM) PRIMARY STRESS

SUMMARY

EMERGENCY CONDITION COMBINATION: P + DWT + S0TE Maximum Allowable Stress Nodo Piping Equation #9 o y Point Comoonent Stress (ksi) (2.25Sm(r1.8S)*

ksi) 3161 Butt Wold 16.846 32.220 3152 Long Radius Elbow 23.471 32.220 3160 Branch Connection 31.104 32.220 3152 CRUN 16.846 32.220 4332 5 0 Bond 7.885 32.220 4170 Roducer 13.730 32.220

• The smaller of the glvon allowable is to be used.

. Attachment to TXX 6398

+

April 15, 1987 Pag] 9 of 23 Table 2 4 CLASS 1 (UPSTREAM) PRIMARY STRESS

SUMMARY

FAULTED CONDITION COMBINATION: P + DWT + SRSS (SSE. 50TF 1 Maximum Allowable Stress Node Piping Equation #9 3.0 Sm Point Comoonent Stress (ksi) (ksil i

5170 Butt Wold 21.021 48.450 1031 Long Radius Elbow 26.075 48.450 5000 Branch Connection 40.223 48.450 5171 CRUN 21.016 48.450 4332 5 0 Dend 17,868 48.450 4170 Reducer 22.982 48.450 1

4 4

1

. Attachment to TXX-6398 April 15, 1987 Page 10 of 23 Table 2-5 CLASS NNS (DOWNSTREAM) PRIMARY STRESS

SUMMARY

NORMAL CONDITION COMBINATION: P + DWT Maximum Allowable Stress Node Piping Equation #9 1.0 S Point Component Stress iksi) (ksi)h 3302 Butt Wold 6.794 15.900 3311 Long Radius Elbow 7.641 15.900 2440 Branch Connection 5.206 15.9tJO 2430 CRUN 6.081 15.900 l

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. Attachment to TXX-6398 April 15, 1987 Pag] 11 of 23 Table 2-6 CLASS NNS (DOWNSTREAM) PRIMARY STRESS

SUMMARY

UPSET CONDITION COMBINATION: P + DWT + SOTu Maximum Allowable Stress Node Piping Equation #9 1.2 Sh Point Comoonent Stress (ksi) (ksil 3302 Outt Wold 6.989 19.080 3311 Long Radius Elbow 7.888 19.080 2440 Dranch Connection 5.703 19.080 2430 CRUN 7.099 19.080

. Attachment to TXX-6398 April 15, 1987 Page 12 cf 23 Table 2-7 CLASS NNS (DOWNSTREAM) PRIMARY STRESS

SUMMARY

UPSET CONDITION COMBINATION: P + DWT + SRSS (0BE. S0T U I Haximum Allowable Stress Node Piping Equation #9 1.8 Sh Point Component Stress (ksi) (ksil 4531 Butt Wold 14.070 28.620 3311 Long Radius Elbow 11.965 28.620 3450 Branch Connection 10.871 28.620 2430 CRUN 13.414 28.620 l

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l

Attachment to TXX-6398 April 15, 1987 Page 13 of 23 Table 2-8 CLASS NNS (DOWNSTREAM) PRIMARY STRESS

SUMMARY

EMERGENCY CONDITION COMBINATION: P + DWT + S0TE Maximum Allowable Stress Node Piping Equation #9 1.8 Sh Point Comoonent Stress (ksi) (ksil 3360 Butt Weld 17.421 28.620 3322 Long Radius Elbow 18.386 28.620 1430 Branch Connection 10.860 28.620 1420 CRUN 18.629 22 620 l

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l

-Attachment to TXX-6398

.- April 15, 1987 Page 14 of 23 Table 2-9 CLASS NNS (DOWNSTREAM) PRIMARY STRESS

SUMMARY

FAULTED CONDITION COMBINATION: P + DWT + SRSS (SSE. SOTF 1 Maximum Allowable Stress Node Piping Equation #9 2.4 S Point Component Stress (ksi) (ksi)h 4531 Butt Weld 19.288 38.160 1311 Long Radius Elbow 20.838 38.160 3450 Branch Connection 14.571 38.160 1420 CRUN 22.400 38.160

Attachment to TXX-6398 -

April 15, 1987 Page 15 of 23 TABLE 3-1 Tabulation of Worst-Case Stress vs. Allowable Stress Representative Supports from Figure A-8 Worst Standard Component Worst Stressed (Strut or Snubber) Structural Component Support No. Support Tvoe Actual Load Allowable load L.C.** Tvoe* Actual Allowable L.C.**

RC-1-Il5-015-C76R Parallel struts 52475 lbs 75900 lbs (clamp) F 2 18,189 psi 19,600 psi F attached to frame 3 Interaction 1.0 F 0.76 1 Interaction 1.0 F 0.565 RC-1-ll5-008-C76K Snubber attached 2346 lbs 22100 lbs F 5 0.5" 0.39" F (1) to frame Thick plate Thick plate 4 Interaction 1.0 F 0.57 OStructural Component Tvoes: ** Load Combination Case: (1) Analysis based on allowable stress requires plate thick-1 - Support Member F - Faulted ness of 0.39"; actual plate 2 - Weld E - Emergency thickness is 0.50".

3 - Base Plate / Anchor Bolt U - Upset 4 - Richmond Insert / Threaded Rod 5 - Other: Load-Carrying End Plate

Attachment to TXX-6398 April 15, 1987 Page 16 of 23

~

TABLE 3-2 Tabulation of Worst-Case Stress vs. Allowable Stress' ,

Representative Supports from Figure A-9 Worst Standard Component Worst Stressed (Strut or Snubber) Structural Component Sucoort No. Support Tvoe Actual Load Allowable load L.C.** Tvoe* Actual Allowable L.C.**

RC-1-Il5-019-C66K Snubber attached 20121 lbs 67200 lbs E 3 Interaction 1.0 F to frame 0.89 20466 lbs 72450 lbs F 1 Interaction 1.0 F 0.77 RC-1-Il5-020-C66R Rigid frame --- --- --

2 14,899 psi 17,864 psi F 3 Interaction 1.0 F 0.84 RC-1-ll5-023-C66R Rigid frame --- --- --

2 Interaction 1.0 F 0.76 1 Interaction 1.0 F 0.56 RC-1-ll5-029-C56K Snubber attached 8226 lbs 72450 lbs F 2 0.25" 0.221" F (1) l to frame l 4 Interaction 1.0 F l 0.66 OStructural Component Types: ** Load Combination Case:

1 - Support Member F - Faulted (1) Analysis based on allowable 2 - Weld E - Emergency stress requires weld size of 3 - Base Plate / Anchor Bolt U - Upset 0.221"; actual weld size is 4 - Richmond Insert / Threaded Rod 0.25".

5 - Other:

Attachment to TXX-6398

• April 15, 1987 Page 17 of 23 TABLE 3-3 Tabulation of Worst-Case Stress vs. Allowable Stress Representative Sampling for Supports on Figure A-10 Worst Standard _ Component Worst Stressed (Strut or Snubber) Structural Component Support No. Support Tvoe Kctual Load Allowable load L.C.** Tvoe* Actual Allowable L.C.**

RC-1-097-002-C86K Snubber attached 8488 lbs # s 72450 lbs F 3 Interaction 1.0 F j to frame -

, O.54

3 12485 psi 26250 psi F i

i OStructural Component Tvoes: ** Load Combination Case:

1 - Support Member F - Faulted 2 - Weld E - Emergency 3 - Base Plate / Anchor Bolt U - Upset 4 - Richmond Insert / Threaded Rod 5 - Other:

Attachment to TXX-6398 April 15, 1987 Page 18 of 23 TABLE 3-4 Tabulation of Worst-Case Stress vs. Allowable Stress Representative Supports from Figure A-11 Worst Standard Component Worst Stressed (Strut or Snubber) Structural Component Support No. Support Tvoe Actual Load Allowable Load L.C.** Type

• Actual Allowable L.C.**

RC-1-099-002-C86K Snubber attached 7915 lbs 22100 lbs F 4 Interaction 1.0 F to frame 0.83 2 14,005 psi 17,864 psi F OStructural Component Tvoes: ** Load Combination Case:

1 - Support Member F - Faulted 2 - Weld E - Emergency 3 - Base Plate / Anchor Bolt U - Upset 4 - Richmond Insert / Threaded Rod 5 - Other:

. Attachment to TXX-6398

• 2 April 15, 1987 Page 19 of 23

, TABLE 3-5 Tabulativa of Worst-Case Stress vs. Allowable Stress Representative Supports from. Figure A-12 Worst Standard Component Worst Stressed

(Strut or Snubber) Structural Component

Support No. Support Tvoe Actual Load Allowable Load L.C.** Tvoe* Actual Allowable L.C.**

RC-1-101-002-C86K Snubber attached 3452 lbs 10640 lbs F 5 13,125 psi 26,250 psi F to base plate 3 Interaction 1.0 F 0.12 1

i i

OStructural Component Tvoes: ** Load Combination Case:

1 - Support Member F - Faulted 4 2 - Weld E - Emergency 3 - Base Plate / Anchor Bolt U - Upset 4 - Richmond Insert / Threaded Rod 5 - Other:

Attachment to TXX-6398 April 15, 1987 Page 20 of 23 TABLE 3-6 Tabulation of Worst-Case Stress vs. Allowable Stress Representative Sampling for Supports on Figure A-13 Worst Standard Component Worst Stressed (Strut or Snubber) Structural Comoonent Support No. Support Tvoe Actual Load Allowable load L.C.** Tvoe* Actual Allowable L.C.**

RC-1-110-001-C86K Snubber attached 3226 lbs 6000 lbs U 3 Interaction 1.0 F to base plate 0.43 4612 lbs 9400 lbs F 3 9,769 psi 23,925 psi F RC-1-ll2-003-C86K Snubber attached 2147 lbs 6000 lbs U 3 Interaction 1. 0 . F to base plate 0.25 3339 lbs 9400 lbs F 2 1,371 psi 20,365 psi F oStructural ComDonent Tvoes: ** Load Combination Case:

1 - Support Member F - Faulted 2 - Weld E - Emergency 3 - Base Plate / Anchor Bolt U - Upset 4 - Richmond Insert / Threaded Rod 5 - Other:

Attachment to TXX-6398 April 15, 1987 Page 21 of 23 TABLE 3-7 Tabulation of Worst-Case Stress vs. Allowable Stress Representative Sampling for Supports on Small Bore Iso RC-1-RB-019 Worst Standard Component Worst Stressed (Strut or Snubber) Structural Component Support No. Support TYDe Actual Load Allowable load L.C.** TVDe* Actual Allowable L.C.**

RC-1-103-700-C75K Snubber attached 39 lbs 267 lbs F --- --- --- ---

to frame RC-1-103-702-C75R Rigid frame --- --- ---

3 1,528 psi 27,000 psi F 2 2,763 psi 17,864 psi F RC-1-103-705-C75R Snubber attached 84 lbs 510 lbs F 3 1,514 psi 27,000 psi F to base plate OStructural Component Tvoes: ** Load Combination Case:

1 - Support Member F - Faulted 2 - Weld E - Emergency 3 - Base Plate / Anchor Bolt U - Upset 4 - Richmond Insert / Threaded Rod 5 - Other:

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