ML19309B105

Reanalysis of Safety-Related Piping Sys, Corrected Pages

ML19309B105
Person / Time
Site:	Surry
Issue date:	03/28/1980
From:	STONE & WEBSTER ENGINEERING CORP.
To:
Shared Package
ML19309B104	List: ML19309B103 ML19309B105
References
NUDOCS 8004030128
Download: ML19309B105 (8)

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I CORRECTED PAGES TO REVISED REPORT ON THE

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REANALYSIS OF SAFETY-RELATED PIPING SYSTEMS SURRY POWER STATION - UNIT 1 VIRGINI A ELECTRIC AND POWER COMPANY t

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 Sect ion 3, Page 3- I Replace page in existing report.

4. Section -3, Tabic 3-18, 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 developed 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 af May 25, 1979 to Virginia Electric and Power Company (VEFCO), 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 SHOCK 2 problems have been teanalyzed and approved by S&W Engineering l Assurance or NSC Project Management. Tatie 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 Fever 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.

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 2-2

II SURRY POWER STATION, UNIT 1 TAPLE 2-1 (Cont) -

- PIPE STRESS REEVALUATION

SUMMARY

DESIGN BASIS E RTHQUAKE

-s LIgend: .

NA : Not Available l Allowable Stress : 1.8 S h l N:w Total Stress : SLP + SDW + 1.5 SDBEI + SDBEA (f or SSI/ARS) l New Seismic = 1.5 SDBE1 (for SSI/ARS) l New Total Stress : Sgp + SDW + SDBEI

• SDBEA ( riginal ARS) l New Seismic : SDBEL ( riginal ARS)

NOTE:

• ' The original totalM and original seismicMThestresses shown in Table 2-1 were computed using new total and new seismic stresses were SHOCK 2 for the original design conditions. in some cases, different ARS's computed by the NUPIPE program More usingimportantly, different massthe models and, were based on field-verified reanalyses than the original calculations. which, in some cases, differ significantly from the original

• " piping configurationsFor this reason, the new stresses and the originalthe same physical in 1979, stresses in Table 2-1 design conditions. conditions.

are not comparable, as they do not necessarily represent J 1, 1979 table and table submitted DESCRIPTIVE NOTES (To explain differences between the August in this report): --

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

This supports were added or modified to reduce loads on other existing supports.

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2. Pipe stress analysis performed since the August 1, 1979 submittal.

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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 bothAs-built spray headers wereinconsidered differences as being pipe supports caused similar two

"~ therefore only one analysis made.

separate pipe stress runs be made. This resulted in different hardware modifications due

'v 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 l 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 i

supports are multiplied by 1.5. Anchor movenents are not considered in the calculation of support stresses for the DBE conditions.

l 3-1

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' SURRY POWER STATION, UNIT 1

• TABLE 3-1B (Cont)

PIPE SUPPORT STATUS

SUMMARY

OUISIDE COsINMENT - SHOCK 2 1

No. Accep- Modifica- ,

table tions or (Evaluation No. Under Additions System

and Total No. of Corolete) __ Evaluatiqn Recuired_ Con-ent Prob. No. Surrerts Component Cooline i - 6 26 26 l 488/480

- 4 20 20 507/481

- 9 27 27 509A/D ,

- 1 6 6 i l 5093 2 2 509C

- 3 5 5 512

- 7 34 34 517

- 3 11 11 526C

! - 3 13 13 527A/C

- 1 15 15 612 J

- 8 14 14 614

- 6 17 17 766

- 3 6 6 1512

- 5 11 11 2526

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'l 14 14 2527/2529 Containment I Vacuun

- 1 3 3 CV1 3" MP Stean 19 19 746 l'

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TABLE 3-2 (Cont) .

- PIPE SUPPORT HARDWARE MODIFICATION

SUMMARY

Description of Modified Since Pre' lam Support Modification or August 21, 1979 Attributable Resolution To:

No. No. Overstressed Condition Submittal Uplift problem Note 1. Yes Seismic Replace rod hanger with sway strut. -

13 Roanalysis Uplift problem Note 1. Yes Seismic Replace rod hanger with sway strut.

14 Reanalysis U-bolt overstressed Note 1. Yes Seismic Replace with frame.

CF-2 2 Roanalysis Seismic Added weld and gusset plater.

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

Seismic Increase weld, add brace (S1W).

22 Weld and bolts overstressed Note 1. Yes Reanalysis Weld overstressed Note 1. Yes Seismic Increase weld.

I 6 Reanalysis Note 1. Yes Seismic Replace with frame, add bracings l 509B 28 U-bolt overstressed Reanalysis and baseplate.

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

512 3 Reanalysis overstressel Note 1. Yes Seismic Modify support, remove support, 6 Structure, weld and U-bolt Reanalysis add frame.

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

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

Seismic Add plates and shims.

~l 614 1 Structure overstressed Note 1. Yes Reanalysis ganged with H27 Pro. 8509B Seismic Replace U-bolt w/ frame, add brace.

2 Structure and U-bolt Note 1. Yes Reanalysis overstressed

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SURRY POWER STATION, UNIT 1 [

TABLE 3-2 (cont)

PIPE SUPPORT HARDWARE MODIFICATION

SUMMARY

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Description of Modified Since Problem Support hodification or August 21, 1979 Attributable No. No. Overstressed Condition Submitral 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. #509B, H7 Pro. #512) 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 vc.

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

weld overstressed (ganged Reanalysis -

with H39, Pro. #517) 7 Support, structure over- Note L. Yes Support Modify support, stress (ganged with Reanalysis H32, Pro. #517) 8 Support uplift over- Note 1. Yes Support Modify support.

stress problem (ganged with Reanalysis H33, Pro. #517) l 9 Support veld overstressed Note 1. Yes Support Add shim plate and angle, and uplift (ganged with Reanalysis H34, Pro. #517) 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

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SURRY POWER STATION, UNZT 1 ,"

TABLE 3-2 (Cont) .'

PIPE SUPPORT HARDWARE MODIFICATION

SUMMARY

Description of Modified Since Problem Support Modification 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. #512, H2, Reanalysis Pro. 82529) '

l 6 Integral velded attachment Note 1. Yes Seismic Modify Support.

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overstressed - Reanalysis 9 Uplift problem Note 1. Yes Seismic Replace rod hanger with sway Roanalysis strut.

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

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

j NOTES:

1. Modification outside containment.

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

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