ML19329C456

Forwards Response to NRC 760323 Position Statement & Request for Addl Info Re Sump Design,Suction Line Pressure Loss Calculations,Manufacturers Test Results,Eccs Flow & Cold Sump Test Pressure Loss Calculations

ML19329C456
Person / Time
Site:	Davis Besse
Issue date:	05/07/1976
From:	Roe L TOLEDO EDISON CO.
To:	Butler W Office of Nuclear Reactor Regulation
References
NUDOCS 8002140834
Download: ML19329C456 (18)

Text

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' NRC,penu 105 I: re UA NUCLLAR Mf. Gut.ATORY COMMI'440N DOCKEY HUMIER E o 3 4 (,

' NRC DISTRIBUTION ron iRT 50 DOCKET MATERIAL T0- 9} eutter FHOM:

toledo Edison C apanv DATE or DOCUMENT 3

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'- N L E :lce DATE RECEIVED 5-lt-/C tCLETTEn ONoToRizco PRoe

1. NeuT roRu NuuoER or Cor:Es nECElvEo CoRIGINAL EUNCLASStelED OCopy one signea

,y OtsCRiefloN ENCLOSURE

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Respdnses to Start posittUns i requqst.s ' tor acul inra....

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BRAl'CH CHIEF :

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IIELTEMES AT & I SITE SAFETY & ENVIRC I

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TOLEDO EDISON OWEa E.RCE Docket No. 50-346 v.c. pr

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.o...at (4191 259-5242 May 7, 1976 Director of Nuclear Regulation Attention:

Mr. Walter R. Butler, Chief Light Water Reactors Branch 4 Division of Project Management United States Nuclear Regulatory Commission Washington, D.C.

20555

Dear Mr. Butler:

In response to your letter of March 23, 1976, please find enclosed the Applicant's responses to the NRC staff position (Enclosure 1) and request for additional information (Enclosure 2).

Yours very truly, J

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i THE TCLEDO EDISON COMPANY EDISON PLAZA 300 MADISCN AVENUE TOLEDO. CHIO 43652p.A.}

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, ENCLOSURE 1 POSITION STATE}EITI' TOLEDO EDISON COMP /-NY FOR DAVIS-BESSE, UNIT 1

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Sufficient justification of the sump design to assure that vortexing would not occur has not been given.

No studies or test data have been offered.

The design of the anti-vertexing device is not supported by test data.

This additional redue. ion in available head, in feet, due to this device has not been provided. Available information (H. Woodhouse, Power, May 1966) indicates that less than 3 feet of margin exists to the minimum recommended pipe submergences.

Accordingly, the applicants are required to either provide a full-flow onsite vortex test, or conduct model tests to show that their sump con-figuration is not subject to vortex formation after LOCA.

RESPONSE

Arrangements are currently being made to conduct a model test. The results of this test will be forwarded when the test has been completed.

The entrances losses including the sump screens and anti-vortexing device vill ba measured as part of this test.

1 i

1 PAGE 1 H17

ENCLOSURE 2 REQUEST FOR ADDITIONAL INFORMATION TOLEDO EDISON COMPANY i

DAVIS-BESSE, UNIT 1 (DOCKET 50-346)

1. In response to a ques?. ion pertaining to NPSH, the applicant raised the predicted flood level inside the containment 6.1 feet over the p.redicted level used for NPSH calculations in the FSAR.

The reason given was that several errors were discovered in the FSAR calculations.

Provide a comparison of current calculations of predicted flood height with the previous calculations, clearly showing the original error.

State the basis for the 360,000 gallons of water from the BWST and indicate the quantity of water still remaining in the BWST at the time of the shift to the recirculation mode.

Provide the calculations of pressure losses in the suction lines for each of the four pumps, including the values of all L/D's, areas, Reynolds Numbers, and friction factors. Clearly show where each value was derived, including all fittings in the suction piping. What pressure loss is attributed to the sump screens?

RESPONSE

The original calculation conservatively assumed the suction pipe center-line elevation (561' 0") instead of the minimum flood level of 567.1 feet as the containment water level. Also during the course of our review of these calculations we found that the minimum flood level of 567.44 feet as presented in response to question 6.2.10 in FSAR revision 3 was, also, slightly in error.

This calculation did not take into account the pi,t under each steam generator.

This calculation was revised to include these pits assuming that their complete volume is floodable where, in f act, a considerable amount of the volume is filled by steam generator snubbers and supports.

This calculation was also revised to reflect changes in the shield walls made since the calculation was originally completed. The new elevation is 567.1 feet as presented in the response to question 6.2.10 in revision 17 of the FSAR.

i i

The 360,000 gallons of water from the EWST is the amount of water required to provide the minimum flood level indicated above and also provides for operational flexibility for the 550,000 gallon BWST.

In response to standar-diced technical specifications, a minimum of 402,500 gallons will be required in the BUST.

This volume allows 42,500 gallons to remain in the BWST at the time of the shift to the recirculation mode.

In this regard only 41,009 gallons are required to fill the BWST to the recirculation shift set point plus the setpoint tolerance.

i PAGE 2 4

The attached drawing.7749-M-233B, Revision 13, indicates the suction piping arrangement for the Decay Heat and Containment Spray Pumps.

Table 1 is an itemized list of fittings in each piping section with the appropriate L/D valves. Also included in this table is the piping length and the total equivalant length.

The density used has been revised since our 1/8/76 submittal to reflect 2500F water temperature.

The entrance losses and reducer losses are developed in table 2 as is the combined head loss for each piping section.

Using the numbers developed in table 2 the total head loss in the suction piping for each Decay Heat Pump and each Containment Spray Pump was de-termined using the formulas below:

hL (Decay Heat Pump) = h (18"-HCB-1) + h (14"-HCB-1) + h (18"-GCB-8) t y

t

+h (12"-GCB-8) t hL (Containment Spray Pump) = h (18"-HCB-1) + h (14"-HCB-1) +

t t

h (10"-HCB-3) 4 h (8"-HCB-3) t t

The resulting head losses and NPSH available are; hr,(DHP #1-1) = 5.73 feet NPSHA(DHP #1-1) = 13.4 feet h (DHP #1-2) = 6.96 feet NPSP.A(DHP #1-2) = 12.2 feet t

h (CSP #1-1) = 4.76 feet NPSIA(CSP #1-1) = 15.8 feet t

h (CSP #1-2) = 5.58 feet NPShA(CSP #1-2) = 14.9 feet t

The antitortening davise was assumed to have neglible ettect on the entrance losses. The head loss across the screens was determined to be neglible as indicated below using the following assumptions:

1.

Horizontal screen area neglected 2.

50% of vertical wire mesh area is blocked 3.

Wire mesh entrance is a slightly rounded entrance 4

The transition from the wire mesh to the grating is a sudden enlargement using the transition method of ref(1) page 4-8.

The demensions below are obtained from FSAR figure 6-23 and attached drawing 7749-C-119:

wire mesh grating inner edge height 2' 0" l'

10 "

width large end 6' 4 1/16" 6' 2 9/16" width small end 4' 7 5/8" 4' 6 1/8" le gth 14' 3" 14' Using the numbers above the areas are:

mesh area = 2 ' (14. 25 ' + 6. 34 ' A 4.64') = 50.45 ft2 grating area = 1.875'(14' + 6.21' + 4.51') = 46.35 ft2 PAGE 3

,F.

The sketch below indicates the necessa~ry grating surface dimensions.

-These Bars removed

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a 4"

'I 4

+

, 0. 2 5 "

, I. I7 "

Neglecting the removal of any cross-bars,the fraction of grating open =

((4"-t")(4.4375"))/((4"x1.17"x 4) = 0.889 The mesh flow area = (mesh area)(fraction open area not assumed blocked)

(fraccion of mesh open)(fraction oc mesh not blocked by grating) =

50.45 ft2 (0.5)(0.534)(0.889) = 11.97 ft2 The grating exit flow area = (grating area)(fraction of grating open) =

46.35 ft2 (0.889) = 41.2 ft2 Velocity equals flow divided by flow area 2

or entrance velocity = 11,000gpm/((7.48 a1 )(6'O sec)(11.97 ft ))

ft min

= 2.05 ft/sec 2

exit velocity = 11,000gpm/((7.48dal )(60 sec)(41.2 ft ))

ft7 min

= 0 59 ft/see using resistance coefficients from ref(1) page A-26 of K = 0.23 for entrance, K = 0.83 for sudden enlargement, and K = 1.0 for exit, the resultant head loss is ht=KV2 = (0.23)(2.05ft/sec)2 + ((0.83?(2.05f t/sec) 2 +(0.83Y0.59ft/sec)2) 2g

~T(J2.2tt/sec4) 2(2)(32.2ft/sec2)

+ 1.0(0.59ft/sec)2 = 0.0498ft whiah is neglible.

2(32.2 f t/sec )

z Reference (1) is CRANE Techinical Paper No. 410. " Flow of Fluids Through Valves' Fittings, and Pipe" i

PAGE 4 s,

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t 2.

Provide the manufacturer's test results (data / curves) for the four pumps used to determine the required NPSH.

Confirm that these tests were conducted on the Davis-Besse 1 pumps (i.e., not prototypes).

RESPONSE

As indicated in the response to Question 3 of the N.R.C. Letter on the ECCS sump dated November 14, 1975, the Containment Spray Pumps (P-56-1, P-56-2) were tested by the manufacturer in accordance with The Hydraulics Institute Standards and the Decay Heat Removal Pumps (P-42-1, P-42-2) were tested by the manufacturer in accordance with The A.S.M.E. Power Test Code for Centrifugal Pumps PTC - 8.2.

Each pump installed at Davis-Besse Unit I had been tested and a perform-ance curve developed for that pump. The performance curves for Decay Heat Removal Pump No. 1 (P-42-1) and Containment Spray Pump No. 1 (P-56-1) are reflected in figure 6-9 and 6-18 respectively in the FSAR. The curves for Decay Heat Removal Pump No. 2 (P-42-2) and Containment Spray Pump No. 2 (P-56-2) are attached and will be incorporated iu the FSAR in the next revision.

It should also be pointed out that the recuired NPSH valves for the decay heat pumps were inadvertently reversed in our 1/8/76 submittal and should be 11.0 feet required for decay heat pump 1-1 and 9.5 feet required for decay heat pump 1-2.

l Pact 5 l

3.

Item 4 in the 1/8/76 letter from the applicants is not clear.

The indication is that some means are provided to prevent excessive flows.

Describe how the required ECCS flow will be established during the preop tests.

State the flow criteria and describe its basis.

Indicate the appropriateness of the flow criteria for both the injection mode and the rec.rculation mode.

Discuss the potential for these settings becoming changed.

Include a discussion of the uncertainties involved in the final established flow (in terms of + gpm).

RESPONSE

The discharge valves of the Decay Heat Coolers (DH-14A and DH 14B) will be fitted with mechanical stops to prevent the valves from fully opening.

Calculations have been completed to determine the throttle position of the subject valves. The following flow conditions were considered in the analysis:

CASE PHASE ASSUMPTIONS I

Injection, Highest B.W.S.T. Full - Elevation 629' flow Lowest Break Location - inlet to valves DH-11 & 12 - 559.25' Lowest Containment Pressure -

assumed 0 PSIG Water Temp - 1250F II Injection, Lowesc B.w.S. T. assumed at 3 ' level (588')

flow Highest Break Location - 647'

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Highest Containment Pressure - 34.7 PSIG

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Lowest Water Temperature - 50 F III Recirculation, Sump at highest level - 572.2' Highest flow Break at elevation - 572.2' Lowest Containment Pressure - 0 PSIG Water Temperature - 2500F IV Recirculation, Sump level is minimum - 567.06' Lowest flow Lowest Water Temperature - 500F Highest break location - 647' Highest containment pressure - 34.7 Using the above conditions,the required throttle position for the subject

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valves (637. open) was determined such that at the highest flow condition, Case I, the Decay Heat Removal pumps will be discharging at 4000gpm and in all other cases the pumps will' be discharging at a rate greater than 3000gpm but less than 4000gpm.

If the flow were to be greater than 4000gpm in Case I, due to the accuracy of the calculation, it would only be for a very short time.

There is more than enough NPSH availble to prevent cavitation for Case I and J

the margin in motor service factor will ensure that the motor is not over-loaded.

PAGE 6 l

The mechanical stop will be set and the pressure drop verified at the completion of the test described in the answer to question 4.

The stop is a mechanical stop and as such would take a deliberate effort to change.

O PAGE 7

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4.

Uith the proposed test setup consisting of a connector in the sump between the two suction lines, it appears that the means exist to achieve the maxi-mum flow rate capability of one train (DH pump p'.us spray pump).

The i

object of the test vould be to confirm the presstre losses submitted in the 1/8/76 letter from the applicants.

Differences should only be due i

to entrance losses and temperature.

Discuss means to confirm predicted entrance losses.

4 Provide all calculations utilized to predict the expected pressure losses for the cold sump test.

Describe the criteria which will be used to deter-mine that the test verified the e::pected post-L.0CA conditions and discuss the capability to vary flow to obt ain more than one point on a plot of NPSH versus flow.

Describe the instrument to be used for the pressure drop measurements, l

include a diagram of its scale, and specify the instrument uncertainty involved.

I J

RESPONSE

l This test can be conducted at the maximum flow rate capability for one i

train at a time (i.e. 4000gpm for the Decay Heat Pump

.d 1500gpm for the Containment Spray Pump). Once the flow rate is established, using the pump discharge flow indicators to verify the flow rate, the pressure at the Decay Heat Pump suction pressure connection, the Containment spray Famp suction pressure connection, and at a connection on the temporary piping between the sump suction lines would be obtained. Using these pressures the piping head loss minus the sump entrance loss would be i

calculated using the formula below:

ht=Pconn - Psuct + Econn - Esuct Where, hg = suction piping head loss minus the entrance loss Peonn = :he pressure at the connection on the temporary pipe,,ft Psuct = the pressure at the pump suction pressure connection, ft Econn = the elevation at the instrument on the temporary pipe, ft Esuct = the elevation at the pump suction pressure instrument,ft

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During the test the BWST water temperature would also be obtained.

Using the temperature obtained, the calculation described in response to request number 1 will be done at the test temperature.

For comparison, a calculation was donc using a water temperature of 50 F.

The resultant head loss minus the entrance loss for each pump is indicated below:

1 50 F 250 F DHP #1-1 5.53 ft.

5.09 ft.

l DHP #1-2 6.89 ft.

6.43 ft.

CSP #1-1 4.54 ft.

4.12 ft.

CSP #1-2 5.46 ft.

4.95 ft.

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Comparing the numbers obtained for head loss minus entra.cc loss during the test with those calculated using the test water tempera *are, the calculation presented in response to request number 1 will be considered verified if the test value is no more than 107, higher than the calculated valve. Note that even with this 10% margin, which is considered to be the accuracy of the calculation, the maximum 0.64 feet reduction in NPSHA does not make NPSHA less than required.

It must be pointed out that this test does not measure NPSH.

The NPSH tests were done by the pump manufacturer as indicated in response to request 3 in our 1/3/76 submittal.

This test only measures the suction piping head loss. Since the maximum flow condition is most restrictive from an NPSH standpoint and the point where the most accurate test results will be obtained, perfonning this test at additional flow points would yield no additional information and will not be done.

The pressure instrument is an 8%" Heise Gauge with a range of 0-50 PSIG.

The scale length is 45" with a pointer travel of 6600 The scale is graduated in 0.05 PSIG increments with an accuracy of 0.17. of full scale or 0.05 PSIG.

Scale is shown in figure 3.

PAGE 9

h Number of each type of fitting a

5 TRAIN 1 TRAIN 2

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45* Standard Elbow 16 I

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90* Long Radius Elbow 20 2

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2 4

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Tee-Through Run 20 1

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Tee-Branch Run 60 1

1 1

1 Quantity /Line 8']

QUANTITY Q

TRAIN 1 TRAIN 2 (1) Total L/D 100 13 53 60 133 20 136 13 49 80 169 20 (2) Piping Schedule 10S 10S 20 20 10S 10S 10S 10S 20 20 10S 10S

,3) Flow 5500 5500 4000 4000 1500 1300 5500 5500 4000 4000 1500 1500 (4) Pipe Inner Diameter (ID) 17.624 13.624 17.376 12.25 10.42 8.329 17.624 13.624 7.376 12.25 10.42 8.329 (5) Fitting equivalent lengt h 146 15 77 61 115 14 200 15 71 82 147 14 (1 x 4) 1 (6) Piping Length 36 3

16 20 16 7

37 3

11 38 44 6

I (7) Fitting & Piping Length 182 18 93 81 131 21 237 18 82 120 191 20 l.

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h Entrance 0.78 0.78 18 x 14 reducer 0.16 0.16

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18 x 14 expansion 0.16 0.16 18 x 12 reducer 0.21 0.21 10 x 8 reducer 0.13 0.13 TOTAL K 0.78 0.32 0.21 0.13 0.78 0.32 0.21 0.13 Quantity /Line a

sa TRAIN 1 TRAIN 2 a

Q (1) v (f t/sec) 7.22 12.09 5.41 10.9 5.64 8.8 7.22 12.09 5.41 10.9 5.64 8.8

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