ML19309A828

Corrections to Revised Rept on Reanalysis of Safety-Related Piping Sys.

ML19309A828
Person / Time
Site:	Surry
Issue date:	01/31/1980
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
Shared Package
ML19309A824	List: ML19309A823 ML19309A828
References
NUDOCS 8004010387
Download: ML19309A828 (8)

Text

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0 CORRECTED PAGES TO REVISED REPORT ON THE REANALYSIS OF SAFETY-RELATED PIPING SYSTEM 5 SURRY POWER STATION - UNIT 1 VIRGINIA ELECTRIC AND POWER COMPANY i 1. Section 2, Page 2-2 Replace page in existing report.

2. Section 2, Table 2-1, Page 6 of 7 Replace page in existing report.

3 Section 3, Page 3-1 Replace page in existing report.

4. Section 3, Table 3-1B, Page 2 of 3, Replace page in existing report.

5. Section 3, Table 3-2, Pages 8, 9, 10 Replace pages in existing report.

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SURRY POWER STATION, UNIT 1 technique which is always more conservative than the approved SRSS method, and an SRSS technique for inter-modal combination.

Additionally, in some cases, piping is analyzed utilizing amplified response spectra (ARS) that are develcped using soil structure interaction techniques (SSI-ARS). The resultant stresses and loads are used to evaluate piping, supports, nozzles, and penetrations. In accordance with the NRC letter of May 25, 1979 to Virginia Electric and Power Company (VEPCO), the seismic inertial stresses typical loads computed using the SSI-ARS have been increased by a factor of 1.5 for the DBE condition.

All 63 SMOCK 2 problems have been reanalyzed and approved by S&W Engineering l Assurance or NSC Project Management. Table 2-1 for the Design Basis Earthquake shows the results for these 63 stress problems. In Table 2-1, the figures for Original Total Stress, at the point of maximum total stress in the pipe, and Original Seismic Stress, at the same point, are extracted from Table 3-1 of the " Seismic Design Review Equipment and Piping, Surry Power Station," dated September 15, 1971. The original calculations for the seismic design review report are no longer available; therefore, correlations were made to the original stresses in Table 3-1 on the basis of the MSK's.

I In Table 2-1, the columns for New Total Stress, at the point of maximum total stress in the pipe, and New Seismic Stress, at the same point, were taken from l

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BB SURRY POWER STATION, UNIT 1 -

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TABLE 2-1 (Cont)

• PIPE STRESS REEVALUATION

SUMMARY

DESIGN BASIS EARTHQUAKE rs w

Legend --

NA : Not Available

{] l' Allowable Stress : 1.8 S h l New Total Stress : SLp + Spy + 1.5 SDBE1

• 3DBEA (for SSI/ARS)

{ l New Seismic : 1.5 SDBEI (for SSI/ARS) l New Total Stress : Sgp + SDW

• 8DBEI

• 3DBEA (original ARS)

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• s, 6 l New Seismic = SDBEI (original ARS)

EQIE:

'%# The original totalM and original seismicu stresses shown in Table 2-1 were computed using SHOCK 2 for the original design conditions. The new total and new seismic stresses were computed by the NUPIPE rogram using different mass models and, in some cases, different ARS's than the original calcul tions. More importantly, the reanalyses were based on field-verified

%" piping conftgurations in 1979, which, in some cases, differ significantly from the original design conditions. For this reason, the new stresses and the original stresses in Table 2-1 are not comparable, as they do not necessarily represent the same physical conditions.

wJ DESCRIPTIVE NOTES (To explain differences between the August 1, 1979 table and table submitted in this report):

A- 1. The high stress point occurs on a portion of the piping with a lower temperature therafore --

the higher allowable.

2. Pipe supports were added or modified to reduce loads on other existing supports. This A- stress analysis performed since the August 1, 1979 submittal. s-

3. The high stress point occurs on a portion of the piping with a higher temperature therefore the lower allowable.

4 In the original stress analysis both spray headers were considered as being similar therefore only one analysis made. As-built differences in pipe supports caused two

. separate pipe stress runs be made. This resulted in different hardware modifications due A- to pipe support analysis.

5. System operating temperature revised therefore allowable stress changed accordingly.

%- 6. Problem rerun with revised building displacements.

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. SURRY POWER STATION, UNIT 1 SECTION 3 PIPE SUPPORT RESULTS '

Tables 3-1A and 3-1B summarize the pipe supports evaluated in the reanalysis program. There are 944 supports (487 inside containment 457 outside containment) on lines originally analyzed by SHOCK 2. All 944 pipe supports l have been reanalyzed, and 136 pipe support hardware modifications have been identified. The modifications identified, due to pipe support analysis, are listed in Table 3-2.

In cases where SSI-ARS was used, the DBE seismic inertial reactions on supports are multiplied by 1.5. Anchor movements are not considered in the calculation of support stresses for the DBE conditions.

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SURRY POWER STATION, UNIT 1 TABLE 3-15 (Cont)

PIPE SUPPORT STATUS

SUMMARY

OUTSIDE CONTAINMENT - SHOCK 2 No. Accep- Modifica-System table tiens or ,.

and Total No. of (Evaluation No. Under Additions Prob. No. Supports Ceeplete) Evaluation Recuired Comment Component Coeline l 468/480 26 26 -

6 507/481 20 20 - 4 509A/D 27 27 -

9 l 509B 6 6 -

1 509C 2 2 - -

512 5 5 -

3 4

517 34 34 -

7 326C 11 11 -

3 527A/C 13 13 -

3 612 15 15 -

1 614 la 14 -

8 766 17 17 -

6 1512 6 6 -

3 2526 11 11 -

5 2527/2529 14 14 - 4 containment Vacuum CV1 3 3 -

1 3" MP stean 746 19 .19 - -

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SURRY POWIR STATION, UNIT 1 ,

TABLE 3-2 (Cont)

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PIPE SUPPORT HARDWARE HODIFICATION SUNHARY ,

Description of Hodified Since Problem Support dodification or August 21, 1979 Attributable No. No. Overstressed Condition Submittal To: Resolution 13 Uplift problem Note 1. Yes Seismic Replace rod hanger with sway strut.

Reanalysis 14 Uplift problem Note 1. Yes Seismic Replace rod hanger with sway strut.

Roanalysis CF-2 2 U-bolt overstressed Note 1. Yes Seismic Repla a with frame.

2eanalysis 4 Weld overstressed Note 1. Yes Seismic Added weld and gusset plater.

Reanalysis l 488 21 Improper support Note 1. Yes Seismic Add baseplate and shims and added Reanalysis lateral restraint.

22 Weld and bolts overstressed Note 1. Yes Seismic Increase weld, add brace (S&W).

Reanalysis l 6 Wald overstressed Note 1. Yes Seismic Increase veld.

Reanalysis l 509B 28 U-bolt overstressed Note 1. Yes seismic Replace with frame, add bracings Reanalysis and baseplate.

512 3 Structure, weld and U-bolt Note 1. Yes Seismic Remove support, add frame w/ brace.

overstressed Reanalysis 6 Structure, weld and U-bolt Note 1. Yes Seismic Modify support, remove support, overstressed Reanalysis add frame.

8 Integral welded attachment Note 1. Yes Seismic Add pad, add braces.

overstressed Reanalysis l 612 4 Structure and weld over- Note 1. Yes Seismic Add stanchion and slide stressed Reanalysis plates.

""l 614 1 Structure overstressed Note 1. Yes Seismic Add plates and shims.

ganged with H27 Pro. 8509B Reanalysis 2 Structure and U-bolt Note 1. Yes Seismic Replace U-bolt w/ frame, add brace.

overstressed Reanalysis

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SURRY POWER STATION, UNIT 1

-- ,7 TABLE 3-2 (Cont) .

PIPE SUPPORT HARDWARE HODIFICATION

SUMMARY

Description of Hodified Since Problem Support Hodification or August 21, 1979 Attributable No. No. Overstressed Condition Submittal To: Resolution 5 Support structure over- Note 1. Yes Seismic Revise IWA; add lateral brace and stressed (ganged with Reanalysis closure plate to column.

H31, Pro. 8509B, H7 Pro. 8512) 7 Structure and U-bolt Note 1. Yes Seismic Replace U-bolt w/ beams, add brace. -

overstressed Reanalysis l 8 Improper support Note 1. Yes Seismic Add lateral restraint.

Reanalysis -

l 9 Structure overstress Note 1. Yes Seismic Add gussets to baseplate.

Reanalysis 10 Integral welded attachment Note 1. Yes Seismic Replace exist. support w/lWA and overstressed Reanalysis frame to floor.

13 Uplift restraint required Note 1. Yes Seismic Replace vs by ve.

Reanalysis 766 5 Support structure and Note 1. Yes Support Hodify support.

weld overstressed (ganged Reanalysis -

with H39, Pro. 3517) 7 Support, structure over- Note 1. Yes Support Hodify support, stress (ganged with Reanalysis H32, Pro. 3517) 8 Support uplift over- Note 1. Yes Support Hodify support.

stress problem (ganged with Reanalysis H33, Pro. 8517) l 9 Support weld overstressed Note 1. Yes Support Add shim plate and angle.

and uplift (ganged with Reanalysis H34. Pro. 8517) 14 U-bolt, welds and structure Note 1. Yes Support Remove U-bolt, add frame and brace.

overstressed Reanalysis 15 Structure and weld over- Note 1. Yes Support Add braces.

stress Reanalysis 9 of 10

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SURpY POWER STATION, UNIT 1 ,

TABLE 3-2 (Cont)

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PIPE SUPPORT HARDWARE HODITICATION

SUMMARY

Description of Hodified Since **

Problem Support Hodification or August 21, 1979 Attributable .

No. No. Overstressed Condition Submittal To: Resolution 2526 1 Support overstress (ganged Note 1. Yes Seismic Modify support. '-

with H4 Pro. 3512, H2, Reanalysis '

Pro. 82529) l 6 Integral welded attachment Note 1. Yes Seismic Modify Support, overstressed Reanalysis 9 Uplift problem Note 1. Yes Seismic Replace rod hanger with sway Reanalysis strut. -

l 18 Vertical, lateral, axial Note 1. Yes Seismic Replace rod hanger w/ frame, add restraint required by pipe Reanalysis lugs to modified support, relocate stress due to H2O overstress support.

20 Integral welded attachment Note 1. Yes Seismic Rerun NUPIPE revise H18, and overstressed Reanalysis replace IWA w/(2) IWAs.

NOTES:

1. Modification outside containment.

2. Modified prior to interim operation as required per August 22, 1979 order.

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