ML20217D200

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Rev 0 to ENG-ME-347, Min Required Intake Bay Volume
ML20217D200
Person / Time
Site: Prairie Island  Xcel Energy icon.png
Issue date: 02/06/1998
From: Donna Anderson
NORTHERN STATES POWER CO.
To:
Shared Package
ML20217D196 List:
References
ENG-ME-347, ENG-ME-347-R, ENG-ME-347-R00, NUDOCS 9803270353
Download: ML20217D200 (7)
v • d • e


Text

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ATTACHMENT 1 SUPPLEMENT 12 to LICENSE AMENDMENT REQUEST DATED January 29,.1997 Amendment of Coolina Water System Emeroency intake Desian Bases NSP Calculatto:1, ENG-ME-347, Minimum Required intake Bay Volume, February 6, 1998.

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. PINGP 1083, Rsv.1

, Front Page 1 of 1 Retention: Ufe NORTHERN STATES POWER COMPANY PRAIRIE ISLAND NUCLEAR GENERATING PLANT CALCULATION COVER SHEET Calculation Number: EN s - Mr- 3 f 7 Calculation Rev. No.: Addenda No.:

Calculation

Title:

Min im a.m SerulenA InYale 8ar Volues '

t Safety Related?: Y Calculation Verification Method. (Check One):

/ Design Review Alternate Calculation Qualification Testing Scope of Revision:

1 Documentation of Reviews and Approvals:

Originated By: ggggy Date: g f/p7 Checked By:

[ Date: gy,/77 Verified By:

f Date:

1-M-M Approved By:

k Date: / /g 43  ?

j)lNGP 1OE3A, R:;v. 2

' Page 'i of 2 (FRONT)

Retention: Life CALCULATION VERIFICATION CHECKLIST Calculation No.: EA/ #- M J #7 Revision No.:

Use of Computer for Calculation

/ Manual Calculation (no computer results)

Computer Verified Program (Reference Provides Verification)

Unverified Program (Verification of Results Required)

Verification item * (Refer to Site Engineering Manual, Administrative Initials /Date Standard 1.2.3) 1.0 Purpose e Clear objective and problem statement. Nb / \-304 $

e identification of affected structure, system, and/or component. \

e identification of the intended use of the calculation results, e identification of summary results.

2.0 Methodology e Discussion of the method / approach and major steps. Wt(\

/ l-30-i V e Definition of any limitations of methodology.

3.0 Acceptance Criteria e Clear definition of the acceptance criteria. D.A L

/ t -304 \"

. Exceptions clearly defined.

4.0 Assumptions e Sufficient rationale to permit verification of assumption. ML / l-3Cs-3

. Unverified assumptions identified as such.

e References provided for assumptions.

5.0 Design inputs e All applicable design inputs identified. Mh / \ "30s-T9

- CODES, (ASME, CFR, STATE, etc.)

- STANDARDS (IEEE, ANSI, ANS, ASTM, etc.)

- USAR

- Design Criteria

- Input Data

- Regulatory Guides / Requirements (NRC, EPA, STATE, etc.)

- Design Bases Documents

. Appropriate verification of walkdown information.

i J:\ TEMPLATE \1083A. DOT

PINGP 1075. R:v. 5 (Front)

Ret:ntion: 2 years Document Type: 3.960 PRAIRIE ISLAND ANALYSIS INDEX DATA INPUT FORM (Filmed Under Document Type 3.032)

& 1. Sequence Number: U

& 2. Analysis Revision Date: / /

& 3. Document Media Type: l_l

& Document Location:

  1. 5. NSP Analysis Number: 1 I I I I I I I I I I I
  1. 6. (A)ctive, (O)ne-Time, (S)uperseded: 1 I
  1. 7. Analysis

Title:

1 I I I I I l I I I I I I I I I I I I I I I I I I I I I I I I I I I ,

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  1. 8. Revision #: 1 I I I I I I
  1. 9. Addendum #: 1 I I I # 10. Addendum Date: / /
  1. 11. Vendor And. #:1 1 I I I I I I I I I I I I I I I I I I I I I I I I
  1. 12. Analysis Vendor Source Code: I I I I i
  1. 13. Analysis Vendor Name:I I I I I I I I I I I l l l l l 1 I i _ .J l l I l C 14. Document Preparer: 1 I l l l l l 1 1 I I I I l l l l l i I i l i I
  1. 15. Reference Modification / Project #(s): I I I I I l l l l l l l 1 1 I I I I I
  1. 16. Reference / Superseded Analysis: l l l I I l l l l l l l l l l l l l l 1 I I I I I I I I I I I I I i l I I I i I I I
  1. 17. Analysis Type: l_l.l_l.1 I l.1 1 I
  1. 18. Applicable Systems: I I II I II I i1 1 ILJ_II I I
  1. 19. Applicable Structures: 1 I II I II I Ii I il i li l I
  1. 20. Applicable Elevations: I I I II I I II I I II I I I
  1. 21. EquipjComponent ID's:

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  1. 22. Comment Field: I I I I I I I I I I I I I I I I I I I I I I I I I I I l _l l l l l l l 1 1 I I I I I I I I I I I I I I I
23. Data input Form Prepared By: Date:
24. Audit of Data: ,

& -CHAMPS Record Field # - CHAMPS Information Code Field

ENG ME 347 RIv. O page 1 of 3 Minimum Reauired intake Bay Volume 1.0 PURPOSE and

SUMMARY

RESULTS The purpose of this calculation is to determine the minimum volume of water that must be available in the intake Bay, after a design basis seismic event, in order to provide an adequate time frame for operators to manage cooling water loads in accordance with procedural guidance. This calculation uses ENG-ME-298, rev 0, as an input for calculating the total volume in the intake Bay. This calculation documents that 26.9% of the total volume of the intake Bay is required for completion of operator action to manage cooling water system loads, following a design basis seismic event. This represents a margin of 73.1% in total intake Bay volume.

2.0 METHODOLOGY This methodology conservatively computes the total volume in the intake Bay and uses maximum flow demand to determine the maximum time that would be available until that volume is exhausted. Then the time required for operator action to manage cooling water system loads is determined. These two time frames are compared to determine the minimum percentage of volume of the intake Bay that is required.

3.0 ASSUMPTIONS The following assumptions are used in this analysis:

1. Make-up flow from the intake Canal (river) to the intake Bay through the Intake Screenhouse is assumed to be unavailable.
2. Make-up flow from the Recycle Canal into the intake Bay is not credited.

There is no barrier between the Recycle Canal and the Intake Bay. However, since no slope stability analysis has been performed for the Recycle Canal slopes, no credit is taken for that volume of water.

3. The calculation of the volume of water in the intake Bay (ENG-ME-298, rev 0) uses the normal low water elevation (elev. 672.5'). This is two feet lower than the normal water elevation (elev. 674.5'), at which the slope stability analysis is performed. To be consistent with the slope stability analysis, normal water level (674.5') is used in this calculation.
4. The maximum flow demand on the intake Bay is 31750 gpm. This is the combined demand of the cooling water system (ENG-ME-302, rev 0) and the diesel driven fire pump (as described in Supplement 5 to License Amendment Request dated January 29,1997).

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ENG-ME-347 Rev.O page 2 of 3

5. The average time for operator action to manage cooling water system loads is 9 minutes, based on validation testing (previously submitted in Supplement 5 to License Amendment Request dated January 29,'1997).

4.0 ACCEPTANCE CRITERIA This calculation computes the minimum required volume in the intake Bay following a design basis seismic event. This value will be used for comparison to the slope stability analysis. The slope stability analysis determines the displacement of the intake Bay slopes following a design basis seismic event. The difference in water volume available will be the margin of safety.

5.0 DESIGN INPUTS and REFERENCES

1. ENG-ME-298, rev 0
2. ENG-ME-302, rev 0
3. Validation tests of operator performance of AB-3, Earthquakes
4. ANSI /ANS 58.8, American National Standard Time Response Design Criteria for Safety-Related Operator Actions
5. NF-38202-4A 6.0 CALCULATIONS and RESULTS 6.1 The volume of the intake Bay using information From ENG-ME-298, rev 0, and normal water elevation (674.5') is:

3 108393.75 ft2 x 10 ft x 7.48 gal /ft = 8,107,852 gallons 6.2 The volume of water in the sloped area of the intake Bay is:

a. Assume 3:1 slope (NF-38202-4A)
b. Linear feet of sloped area (from ENG-ME-298, Rev 0; Figure 1) is 989.5 ft.

Volume = 1/2(10 ft x 30 ft) x 989.5 ft

= 148425 ft

= 1,110,219 gallons 6.3 Total Volume of the intake Bay is:

8107852 gal + 1110219 gal = 9,218,071 gal 6.4 The maximum flow demand on the intake Bay, from Assumption 4 is:

31750 gpm

. l

ENG ME 347 j Rev.0 .

page 3 of 3 6.5 The total time available for operator action is: l 9218071 gallons = 290.3 minutes (4.8 hr) 31750 gal / min 6.6 The average time for operator action, from validation testing is:

9 minutes 6.7 Assuming a single active failure, it may be necessary for outplant operator action to complete implementation of AB-3, Earthquakes. Using Table 2 of ANSI /ANS 58.8, actions outside control room add 30 minutes to the average validation time. Total time for completion of AB-3 is:

39 minutes 6.8 For conservatism, it is chosen to multiply the total time frame by a factor of 2. The total time then becomes:

39 x 2 = 78 minutes 6.9 To determine the percentage of volume required as the minimum required volume, ,

the time for operator action (6.6)is divided by the total time available (6.3):

78 minutes = 26.9%

290.3 minutes This equates to a minimum required water volume of : l 9218071 gallons x .269 = 2,479,661 gallons

7.0 CONCLUSION

S The minimum required water volume in the intake Bay is 2,479,661 gallons. This volume is a conservative value based on:

a. The normal low water level was used. This is consistent with the water level assumed in the slope stability analysis,
b. Using a 3:1 slope is conservative, as most of the sloped area is more gradual .

than 3:1. [.

c. The time required for operator action, including outplant action, was doubled.

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