ML20217K764

Rev 0 to DCR 990247, Containment Overpressure Duration Requirement (Addendum to Calculation QDC-1000-M-0781)

ML20217K764
Person / Time
Site:	Quad Cities
Issue date:	09/27/1999
From:	Bolime S COMMONWEALTH EDISON CO.
To:
Shared Package
ML20217K705	List: ML20217K701 ML20217K744 ML20217K764
References
DCR-990247, DCR-990247-R00, NUDOCS 9910260235
Download: ML20217K764 (10)

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NEP-12 02.01 Effective Date:

8/30/99 CALCULATION TITLE PAGE i

7 CALCULATION NO: DCR 990247 Page No.1

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DESCRIPTION CODE:(cois) M03 I

STATIONrQuad Cities DISCIPLINE CODE: (Co11) H X U1 U2 O U3 Unit 0 SYSTEM CODE:(C01) RH,CS ELEVATION CODE:(c0t6) N/A l

klTLE: Contain ent Overpressure Duration Requirement (Addendum to Calculation ODC 1000b i

@ Safety Related 7 Augmented Quality Relateo O Non-Safety Related l

REFERENCE NUMBERS (C0t1 Panet)

Type Number i

1.-_.

CCMPONENT EPN:(C014 Panei)

DOCUMENT NUMBERS: (C012 Panel) (Calc. Ref.)

Comp Doc Type /

Document Number EPN Type Subtype

._1,[2}1002A.B C,0 P30 Calc /Ena QDC-1000-M_.0_781

~i 1(D 1401 A.B P30

/

1(2) 1600-D,T TOS

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/

/

L I

REMARKS:

It.tfMMW REV.NO REVISING ORGANIZATION APPROVED PRINT SIGN DATE O

Comed sTEoc' fAcuul: / _f5bd 9/t.7/Ff t

9910260235 991013 PDR ADOCK 05000254 P

PDR PEPP-E FORM l

NEP-1242.02 Effective Date-.

Y 8/30/99 REVISION

SUMMARY

fjgCULATION NO. DCR 990247

_REV: O PAGE NO. 2 REVISION

SUMMARY

Initial Issue. Provide Addendum to Calculation Evaluating Required DuraWon of Containment Overpressure

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Electronic Calculation Data Files: EXCEL 97, Plot.xis,21kb,09/14/59,16:46 (Program Neme. Version, File name ext / size /dato/ hour / mm) 07!23 Prepared by:

Doug!as F. Colhns /hsp at ig.

Print /S T1/ initial Date Reviewed by:

Roger H. Heyn /

fr Tu 7 - 2 3 ~$1 Prir%/S@n/fnttial

/

Date Type of Review-3 Detailed

_J Alternate O Test O Repetitive Calc Review Supplemental Review Required O Yes (NEP-12-05 documentation attached)-e. [4No

-i s - -

Supervisor fM1A

/

'AlliT (Comed USE ONLY)7 '

00 AY/ ASSUMPT1CNS IN TMS CALCUl.AllON REQU RE LATER \\/ERikATICN?

{758 NO t Track 6d by: (NTS'#. AT#. EWCS #. etc.)

N/A PEPP EER M*

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l NEP-12-02.03 Effective Date.

8/30/99 CALCULATION TABLE OF CONTENTS Calc No. DCR 990247 REV.NO.

PAGE NO.

SECTION:

P E

SU GE NO.

fiTLE PAGE 1

REVISION

SUMMARY

2 TABLE OF CONTENTS I

3

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PURPOSE / OBJECTIVE 4

s METHODOLOGY AND ACCEPTANCE CRITERIA 4-5 l

ASSUMPTIONS / ENGINEERING JUDGEMENTS S

l DESIGN INPUT 5-1 REFERENCES 6

CALCULATIONS 6-8

SUMMARY

AND CONCLUSIONS 8

ATTACHMENTS A. Quadratic Extrapolation Plot (2 Pages)

Al-A2-PNPP-E FORM)

J.

NEP-12-02.04 Effective Date:

8/30/99 CALCULATION PAGE CALC. NO. DCR 990247 REVISION PAGE NO. O NO. 4

1. PURPOSE / OBJECTIVE '

The purpose of this calculation is to evaluate the required duration for containment overpressure following a Design Basis Loss-of-Coolant Accident (DBA-LOCA)in order for sufficient net positive suction head (NPSH) to be available to the Residual Heat Removal (RHR) and Core Spray (CS) pumps. This calculation is being prepared in I

support of a letter to the NRC to respond to a request for information on the duration containment overpressure is required.

m

2. METHODOLOGY AND ACCEPTANCE CRITERIA Per Equation 2 of Calculation QDC-1000-M-0781, Rev.1, the minimum required overpressure in order to meet the NPSH requirements (NPSHR, feet) of each pump can be determined from the following equation:

Pmm = (NPSHR - Z + he + h,)/(144V)

(Equation 2)

Where:

l P,

= Minimum required suppression chamber precsure, psia.

Z

= Static head above pump, feet.

hr

= Suction friction losses, feet.

h,

= Vapor pressure, feet absolute.

V

= Specific volume, ft'/lb.

i This equation can be used with the appropriate parameter values (Design input 4.1) to determine the suppression pool temperature at which no overpressure is required.

(Note: the values of h, and V are dependent on suppression pool temperature.) The long-term temperature response of the suppression pool from Ref. 5.2 can then be used to translate the maximum suppression pool temperature value into a minimum containment overpressure duration. EXCEL 97 was used to extrapolate the temperature response following 121,200 seconds as shown in the plot in Attachment A (See Assumption 3.3).

'~ tu duration will be determined for two conditions: (1) the required containment pressure

~

as @own in Figure 1 of Ref. 5.1, and (2) the required containment pressure if the head loss would increase such that the required pool pressure was equal to the credited pool pressure (3.5 psig) at the time of peak suppression pool temperature (as shown in Figure 1 of Ref. 5.1).

Acceptance Criteria:

The suppression pool temperature at which no containment overpressure is required is demonstrated wtien:

PEPP-E FORM l

NEP-12-02.04 Effective Date:

8/30/99 CALCULATION PAGE CALC. NO. DCR 990247 REVISION PAGE NO. O NO. 5 P,n.n s 14.7 psia However, bcsed on a review of the results of Ref. 5.1, the resulting allowance should be equal to or greater than the allowance for increased head loss at the time of peak suppression pool temperature (0.7 psid):

Allowance 2 0.7 psid

3. ASSUMPTIONS AND ENGINEERING JUDGEMENTS

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3.1 This evaluation is concerned only with the limiting long-term scenario of a DBA-LOCA with the assumed single failure of an emergency diesel generator that limits the available pumps to 1 CS,1 RHR, and 1 RHR Service Water Pump.

3.2 Per Ref. 5.1, the limiting pump in the long-term. is the RHR pump; therefore, the required containment overprussure duration for the RHR pump will conservatively bound the requirements of the CS pump.

3.3 Since the containment analysis ends at 121,200 seconds following the accident, a quadratic interpolation of the temperature response is used to predict the temperature behavior at 141,800 seconds. Based on a comparison of the plotted curve with the temperature points in Attachment A, there is sufficient agreement between the function and the temperature response to provide reasonable assurance in the predicted temperature at time 141,800 seconds (Engineering Judgement).

4. DESIGN INPUT 4.1 Per Ref. 5.1, the following parameters apply to the RHR pump in the Design Basis Case (Flow Rate = 5000 gpm):

NPSHR = 30.0 feet Z - h,

= 7.08 feet 4.2 The longeterm temperature response of the suppression pool following a DBA-LOCA is provided in Ref. 5.2:

Time (Seconds)

Temperature (degrees _.F) 70,436 170.7 80,248 167.9 91,099 165.1 101,041 162.7 111,106

~

160.6 121,200 158.7 PEPP-E FORM l

NEP-12-02.04 Effective Date:

i 8/30/99 CALCULATION PAGE CALC. NO. DCR 990247 REVISION PAGE NO. O NO. 6 4.3 Per Ref. 5.3, the values of h, and V for the following water temperatures (T) are:

T = 162.0'F V = 0.016406 ft'llbm h, = 11.76 feet T = 155.6*F V = 0.016372 ft'/lbm h, = 10.06 feet

5. REFERENCES 5.1 Calculation No. QDC-1000-M-0781, Rev.1.

5.2 GE Report GE-NE-T2300750-00-02-R1, " Quad Cities Nuclear Power Station Units 1

{

and 2 Containment Analysis for Long-Term NPSH Evaluation with ANS 5.1 - 1979 +

)

2 Sigma Decay Heat," September 1998.

5.3 Keenan, et. al. Steam Table (English Units) - 1969.

6. CALCULATIONS 6.1 g_ valuation of 162.0 F Pool Water:

The minimum required containment pressure for the RHR pumps with 162.0 F water can be determined per Equation 2:

Puo = (NPSHR - Z + h, + h,)/(144V)

Where (for the RHR pumps and 162.0 F water):

NPSHR = 30 feet (Design input 4.1)

Z - h,

= 7.08 feet (Design input 4.1) h,

= 11.76 feet (Design input 4.3)

V

= 0.016406 ft'/lbm (Design input 4.3)

P,o = (30.00 - 7.08 + 11.76)/(144(0.016406)) = 14.7 psia = 0 psig Thus, the suppression pool temperature at which no containment overpressure is required is 162.0 F. Since the vapor pressure is less for lower temperatures, no containment overpressure is required for suppression pool temperatures less than or equal to 162.0 F. Based on a review of the temperature response in Design Input 4.2, and using a quadratic interpolation / extrapolation (Attachment A), the time at which the temperature is equal to 162.0 F is(where t is the number of seconds after the accident):

T = 1.213x10* 1 - 4.689x10" t + 197.7 = 162.0 2

1.213x10* t - 4.389x10" t + 35.7 = 0 PEPP-E FORM]

NEP-12-02.04 Effective Date:

8/30/99 CALCULATION PAGE CALC. NO. DCR 990247 REVISION PAGE NO. O NO. 7 This Quadratic Eguation (At' + Bt + C = 0) can be solved by the following equation:

JB -4AC 4.689x 10" ](-4.689x10")2 (1.213x 10-')- (35.7) 2

-B

!=

=

2A 2- (1.213x 10-')

t = 104,251 or 282,312 seconds Based on a review of the plot in Attachment A, 104,251 seconds (or 29.0 hours0 days <br />0 hours <br />0 weeks <br />0 months <br />) is the applicable answer for the purposes of this calculaten. Therefore, containment overpressure is required for a duration of 29 hours3.356481e-4 days <br />0.00806 hours <br />4.794974e-5 weeks <br />1.10345e-5 months <br /> following a DBA-LOCA.

6.2 Evaluation of155.6 F Pool Water.

The containment pressure required for a suppression pool temperature of 155.6 F is, per Equation 2:

P,mn = (NPSHR - Z + h, + h,)/(144V)

Where (for the RHR pumps and 155.6 F water):

NPSHR = 30 feet (Design input 4.1)

Z-h,

= 7.08 feet (Design input 4.1) h,

= 10.06 feet (Design input 4.3)

V

= 0.016372 ft'/lbm (Design input 4.3)

P.,n = (30.00 - 7.08 + 10.06)/(144(0.016372)) = 14.0 psia = -0.7 psig Thus, at a suppression pool temperature of 155.6*F and zero containment pressure, the difference between required and credited containment pressure is 0.7 psid. Per Design input 4.3 and Attachment A, the temperature (T) behavior after 121,200 seconds can be predicted by (where t is the number of seconds after the accident):

j T = 1.213x10* t' - 4.689x10" t + 197.7 = 155.6 1.213x10* t' - 4.689x10" t + 42.1 = 0 This Quadratic Equation (At' +Y+ C = 0) can be solved by the following equation:

-B dB: - 4AC 4.689 x 10" d(-4.689 x 10")2 (1.213 x 10-')-(42.1)

]

I=

=

1 2A 2 -(1.213 x 10-')

l

- t = 141,800 or 244,762 seconds PEPP-E FORM l

NEP-12-02.04 Effective Date:

8/30/99

- CALCULATION PAGE CALC. NO. DCR 990247 ON A

O 8 of 8 Based on a review of the plot in Attachment A, 141,800 seconds is the applicable answer for the purposes of this calculation Therefore, crediting no containment overpressure, the allowance is 0.7 psid at a time of 141,800 seconds (39.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />) after the accident.

7.

SUMMARY

AND CONCLUSIONS No containment overpressure is required when the suppression pool temperature is less than or equal to 162.0 F; therefore, based on a review of the long-term temperature response of the suppression pool following a DBA-LOCA, containment overpressure is required for a duration of 29 hours3.356481e-4 days <br />0.00806 hours <br />4.794974e-5 weeks <br />1.10345e-5 months <br />. At 39.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> following the accident with a suppression pool temperature of 155.6 F, there is a 0.7 psid difference between the containment pressure required by the RHR pumps and 0 psig (no containment overpressure), which is equal to the 0.7 psid allowance specified in the acceptance criteria for the calculation. Therefore, conservatively bounding the 29-hour overpressure duration with a 40-hour duration will provide sufficient allowance for the RHR pump in the long-term following a DBA-LOCA.

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C,alc. No. DCR 990247,R,v.O.

Attachm:nt A

~ ~ ~ ~

Page A2 (Final)

Time Temperature (Seconds)

(degrees F) 70436 170.7 80248 167.9 91099 165.1 101041 162.7 111106 160.6 121'200 158.7 1

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