View source for 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

{{Adams
| number = ML20206P010
| issue date = 04/15/1987
| title = Forwards Addl Info Per NRC 870327 Request Re Util 860613 Response to NUREG-0737 Item II.D.1, Performance Testing of Relief & Safety Valves
| author name = Counsil W, Keeley G
| author affiliation = TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
| addressee name = 
| addressee affiliation = NRC OFFICE OF ADMINISTRATION &amp; RESOURCES MANAGEMENT (ARM)
| docket = 05000445, 05000446
| license number = 
| contact person = 
| case reference number = RTR-NUREG-0737, RTR-NUREG-737, TASK-2.D.1, TASK-TM
| document report number = TXX-6398, NUDOCS 8704210075
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
| page count = 24
}}

=Text=
{{#Wiki_filter: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|date=March 27, 1987|text=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
\
i B704210075 870415                                             .
l PDR     ADOCK 05000445                                                                       <
!              A                  POR                                                                 Q(    ,
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n North Olne $ttret LR RI (Wlas. Teens 1.1.'01 l

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.
l I
i l
l 1
l i

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
l l
r

  . 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
l l
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
l l

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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