Text

Rev 1 to Containment Recirculation Sump Evaporation
	ML20116H450
Person / Time
Site:	Millstone
Issue date:	07/27/1995
From:	Anthony Briggs, James Park; NORTHEAST NUCLEAR ENERGY CO.
To:	;
Shared Package
ML20116H438	List: ML20116H450; ML20116H454; ML20116H457; ML20116H467; ML20116H482; ML20116H486;
References
	GL89-10-1243-M2, GL89-10-1243-M2-R01, GL89-10-1243-M2-R1, NUDOCS 9608120092
	Download: ML20116H450 (11)
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y CALCULATION TITLE PAGE Calculation Number : 6787'/8-/243 'N Revision No. :

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CTP DATA BASE INPUTS Calculation No. :I/87-/d-//#.3 eN2 I

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CALCULATION CHECKLIST l

Calculation Number : _ gl87-/d- /243442 Revision No. :

.I Date :

7l26h5 1.

weparation

/Igitials 1.1 Section 6.1.2

.1g/l 1.2 Section 6.1.3 4/J 1.3 S:ction 6.1.4

,(43 1.4 Section 6.4.6 V/J3

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2.2 Section 6.2.2.2

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Table of contents

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Eau Calculation Title Page 1

CTP Data Base Inputs 2

Calculation Checklist 3

Table of Contents 4

Revision Status 5

1.0 Analysis Objective 6

2.0 Design Inputs 4

3.0 Assumptions y

4.0 Method of Calculation (p

5.0 Analysis q

6.0 Summary of Results b

7.0 References g,

8.0 Attachments 9

I 9.0 Appendices i

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/0 REVISION STATUS Pev No.

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1 NORTHEAST UTILITIES SERVICE COMPA Y

SUBJECT:

CONTAINMENT RECIRCULATION SUMP EVAPORATION By:./

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, Date: Wit.dfii Calc. NoYGL89-10-1243 M2. Rev.; l' Sheet No. d of /d 1.0 ANALYSIS OBJECTIVE The objective for this caletdation it to detennine the period of t me required to evaporate the Containment i

Recirculation Sump piping from a full level to an elevation of-( 24'-0") during normal plant operation.

g BACKGROUND To eliminate pressure locking concerns with Containment Sump Isolation Valves 2-CS 16.l A&B, the piping on the containment side must remain full of water. This piping is isolated from the system pressure and is exposed to the containment atmosphere at the Containmant Recirculation Sump. Because of the sump height l

relative to 2 CS-16.l A&B, a certain amount water can evaporate before the potential exists for pressure

[

locking. This calculation will determine how long it will take for this water to evaporate.

+

2.0 DESIGN INPUTS 2.1 Plant Piping Drawing 25203 24030 2.2 Technical Specification Section 3.6.1.5 2.3 Plant Containment Trend Data for normal operation

)

t 3.0 ASSUMPTIONS l

3.1 The reactor contairunent dry bulb temperature and dew point temperature is assumed to be 88 'F and I

70 'F respectively at the sump level. Both the dry bulb and dew point temperatures arc based on operating data, shown in Attachment 1, measured in the vicinity of the sump. The worst case dry 3.

1 bulb temperature was conservatively rounded from approximately 86 'F to 88 'F and the worst case dew point was conservatively rounded from approximately 75 'F to 70 'F.

3.2 The containment sump piping water temperature is assumed to be 88 'F. This number is conservative since the concrcle floor will tend to cool the water in the pipe.

3.3 Prandtl number (Pr) and Schmidt number (Sc) are both equal to one. This assumption is most valid for heat / mass transfer when direct contact exists between the air and water. This assumption is also valid for smooth water surfaces. Both conditions exist for this evaluation.

1 3.4 The reactor containment atmosphere will not change with evaporation of the water in the pipe. This assumption is conservative since the evaporation rate would decrease with increases in room 1

humidity.

3.5 The air flow across the water surface in the pipe will be minimal. A surface heat transfer coefficient for still air will be assumed for this calculation (1.65 BTU /hr ft' 'F per Reference 7.1).

36 The reactor containment is al atmospheric pressure. This is conservative since the containment pressure is slightly above atmospheric pressure which would decrease the rate of evaporation.

4.0 METHOD OF CALCULATION Hand calculation which calculates evaporation using plant operating and design data.

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NORTHEAST UTILITIES SERVICE COMPAN

SUBJECT:

CONTAINMENT RECIRCULATION SUMP EVAPORATION By:..! 4M-

, Date: / & I Chkd i A#71 fA'

, Date: 7/2*/)f Calc. nom GL89-10-1243 M2. Rev.: 1 Sheet No. 7 of M l

5.0 ANALYSIS t

The mass transfer at the water surface was calculated using the following expression:

j M. = h. Ap ( W. - W,

, )

Equation 12 13a Ref. 7.2 w here.

A = exposed pipe area

h. = mass transfer coefficient W.= water surface humidity ratio ( 100% saturated at the surface)

W,

= room humidity ratio given room dry bulb temperature and dew point temperature p = density of dry air The mass transfer coeflicient was calculated using the following expression:

h.= h / p C Equation 12-16a Ref. 7.2 p

w here:

h = surface heat transfer coefDeient (1.65 Blu/hr-ft *F)

C,, = specific heat for air (0.24 Bru/lbm 'F) l Reactor Containment Conditions:

Room dry bulb 88 *F (548 'R)

Room deu point temperature 70

F per Attachment 1 Room humidity ratio (W,

)

0.016 lb moisture /lb dry air - Psychrometric Chart Water Conuitions Water temperaturc 88 *F ($48 *R)

Water humidity ratio (W,)

0.029 lb moisture /lb dry air - Psychrometric Chart-assuming saturated at the water surface.

1 Calculation of room air density:

P p,

, = P / RT = (14.7*144) / (53.34*548) = 0.0724 lb/ft' Ref. 7.1 Eq 6.45 Calculation of mass heat transfer coefficient h.:

h = h/pCp h = I.65/(0.0724*0.24) = 94.95 ft/hr Calculation of cross sectional area of 30 inch diameter stand pipe:

2 Area = [n (D )] / 4 = [n (30/12)2] / 4 = 4.9 ft*

Calculation of cross sectional area of 24 inch Sch 105 pipe section:

Arca = [n (23.5/12)2] / 4 = 3 01 d

NORTHEAST UTILITIES SERVICE COMP

SUBJECT:

CONTAINMENT RECfRCULATION SUMP EVAPORATION By:

.M

, Date:/

Chkd'. XVrif A'

, Date: 7/2p/95 Calc. Nb.d GL'89-10-1243 M2. Rev.: I Sheet No. 8 of_ /C Calculation of mass transfer M.for the 30 inch pipe stand:

M. = h., Ap ( W - W,

)

M.= (94.95)*(4.9)*(0.0724)*(0.029 - 0.016) = 0.438 lb/hr Calculation of mass transfer M. for the 24 inch pipe:

M. = h, Ap ( W. - W,_ )

M. = (94.95)*(3.0!)*(0.0724)*(0.029 - 0.016) = 0.269 lb/hr Calculation of the 30 inch pipe evaporation period:

The 30 inch pipe is 15 inches in length and has a 6 inch transition to the 24 inch pipe as shown on Reference 7.3. Since the larger pipe has more surface area, the transition length will be calculated at the larger diameter.

f Timc = (62.4 lb/ft')(21/12 ft)(4.9 fl')/ 0.4381b/hr = 1221.6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months Calculation of the 24 inch pipe evaporation period:

The 24 inch section is 1.88 ft from the reducer to Elevation - (24'-0") as shown on Reference 7.3.

Time = (62.4)(1.88)(3.01)/(0.269) = 1312.7 hours8.101852e-5 days 0.00194 hours 1.157407e-5 weeks 2.6635e-6 months Calculation of total time for evaporation:

Total time = 1221.6 + 1312.7 = 2534.3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months (105.6 days) 6.0

SUMMARY

OF RESULTS During normal operation the containment sump piping will evaporate from " full" to an Elevation of-(24'-0")

in a period of approximately 2534.3 hours3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months (105.6 days).

7.0 REFERENCES

7.1 Mechanical Engineering Reference Manual. Eighth Edition, Michael R. Lindeburg, Copyrig.H 1990.

7.2 Heating Ventilating and Air Conditioning Analysis and Design Second Edition, Faye C.

7.3 Piping Drawing Number 25203 24030, Section A-A

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NORTHEAST UTILITIES SERVICE COMPA '

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SUBJECT:

CONTAINMENT RECIRCULATION SUMP EVAPORATION By:

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. Date: 7 I/ ##

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14/17A Date: 7 / 74 / 5 Calc. Nd@L89'-10-1243 M2. Rev.: 1 a

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l 8.0 ATTACHMENTS

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7.0 REFERENCES

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