ML20205E867

Forwards Addl Info Re Results of Generic Snupps Review Performed to Assess Effects on Equipment Qualification of Main Steam Line Breaks Outside Containment W/Superheated Blowdowns,Per NRC 870106 Request

ML20205E867
Person / Time
Site:	Callaway
Issue date:	03/24/1987
From:	Schnell D UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
ULNRC-1473, NUDOCS 8703310032
Download: ML20205E867 (29)

Text

_ _ _ _ _ _ _ _ _ _ _ _

yg,og Etscraic a

1901 Gratiot Street. St. Louis Donald F. Schnell Vcc President March 24, 1987 U.S.

Nuclear Regulatory Commission ATTN: Document Control Dock Washington, D.C.

20555 Gentlemen ULNRC-1473 DOCKET NUMBER 50-483 CALLAWAY PLANT MSLB SUPERI1 EAT EFFECTS ON EO

References:

1.

SLNRC 86-06 dated 4-4-86, came subject 2.

NRC Request for Additional Information, P.W. O'Connor to D.F.

Schnell, dated 1-6-87 Reference 1 nubmitted the results of a generic SNUPPS review performed to ancess the ef fects on equipnent qualification of main steam line breakc outcido containment with cuperheated blowdownc.

Referenco 2 transmitted coveral requents for additional information needed for completion of the NRC review of our cubmittal.

The enclosure providen the requested information.

If you have any further questione, please contact us.

Very truly yours, Donald F.

Schnell CCY/ din Enclosure Ok 703310032 B70324 0'PDRADOCK 05000403 PDR p

Maang Address: P.O Box 149. St. Lows, MO 63166

cc:

Gerald Charnoff, Esq.

Shaw, Pittman, Potts & Trowbridge 2300 N. Street, N.W.

Washington, D.C.

20037 J. O. Cermak CFA, Inc.

3356 Tanterra Circle Brookville, MD 20833 W. L. Forney Division of Projects and Resident Programs, Chief, Section lA U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 Bruce Little Callaway Resident Office U.S. Nuclear Regiilatory Commission RR#3 Stoodman, Missouri 65077 Paul O'Connor (2)

Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Mail Stop 316 7920 Norfolk Aver.ue Bethesda, MD 20014 Manager, Electric Department Missouri Public Service Commission P.O. Box 360 Jefferson City, MO 65102

~

ULNRC-1473 RESPONSE TO NRC QUESTIONS MAIN STEAM LINE BREAK SUPERHEAT ANALYSIS QUESTION 1 With respect to the nodalization schemes, provide:

1.A.. Number of nodes (compartments) analyzed; 1.B.

For each node (compartment):

I.

Initial temperature II. Initial pressure III. Initial humidity IV. Compartment free volume V.

Number of vents and vent area (square feet) for each vent; and VI. Compartment height (feet);

1.C.

Simple nodalization diagrams; 1.D.

Identification of break compartment, and relative locations of safety related equipment; 1.E.

Number, volume, surface area, and material properties of thermal sinks within compartments; 1.F.

Descriptions of equipment and the'rmal models of the equipment, including geometry (surface area and volume), material properties (density, thermal conductivity, specific heat) of all materials included in equipment models and sketches of equipment models.

RESPONSE

1.A.

Three nodes (compartments) were used in the analysis. These were the Main Steam Tunnel (MST) - West, the MST - East, and the atmosphere.

1.B.

Initial conditions for each node are provided in the following table. Callaway FSAR (W91f Creek USAR) Figures 1.2-15 and 1.2-16 or Figure 38-2 provide the MST compartment height (approximately 62 feet).

Compartment Initial Initial Relative Vol e

Junction Floy) Area Pressure Tegp.

Humidity (f

(ft (psia)

( F)

MST - West (1) 14.7 120.0 0.70 59,098.92 1-2:

666.81 1-atm.: 203.14 MST - East (2) 14.7 120.0 0.70 59,239.92 2-atm.: 203.14 Atmos.

14.7 95.0 0.50 1

1.C.

For a nodalization diagram, refer to Sheet 2 of Figure 38-4 of the Callaway FSAR (Wolf Creek USAR).

1.D.

The MST - West was identified in the MSLB superheat submittal of 4/4/86 as the break compartment. All safety-related equipment is located in the lower half of the MST compartments. Relative locations of safety-related equipment may be determined from Callaway FSAR (Wolf Creek USAR) Figures 1.2-12,13,15,16; 3B-2 and 3.6-1 (Sheets 1,2,3,29,30and49). However, since worst-case environmental conditions (MST-West) were used in calculating the surface tempera-tures of all equipment without consideration of spatially varying conditions, equipment locations are not a factor in the conclusions stated in the MSLB superheat submittal.

1.E Table 1 provides the requested information on heat sinks.

1.F In preparing Table 3.4 of the MSLB superheat submit t.31, nine equip-ment types were modelled.

In addressing the request for additional information, the need to perform a more detailed analysis of one equipment type (Equipment 10) was identified. The ten equipment thermal models are discussed in the following sections. All models are one-dimensional except those for Equipment 9 and 10.

I Equipment 1:

Solenoid housing, modelled as a 2"-diameter cylinder (d =

0.167'). The material is constructed of stainless steel.

The following data was used in the model:

488 lbm/f t3 Density (D)

=

9 Btu /hr-ft OF Thermal Conductivity (k)

=

0.11 Btu /lbm OF Specific Heat (cp)

=

0.01' (t = 1/8")

thickness

=

refer to Figure 11 sketch Equipment 2: Terminal box. modelled as an equivalent cylinder of hydraulic diameter 0.95' (dh = 11.4").

The boxes are constructed of 14 gauge steel and were modelled using the following data:

487 lbm/f t3 0

=

27 Btu /hr-ft OF k

=

0.113 Btu /lbm OF c

=

p 0.0747" (t =.006')

thickness

=

refer to Figure 12 sketch l

l i,

Equipment 3: Pressure transmitter - top section, modelled as a cylinder of diameter 0.31' (d ~ 3 3/4"). The material is steel, and the data used in the model was as follows:

487 lbm/f t3 D

=

27 Btu /hr-ft OF k

=

cp 0.113 Btu /lbm OF

=

0.0747" (t =.006')

thickness

=

refer to Figure 13 sketch Equipment 4: Conax connector, modelled as a 0.75" diameter cylinder (d = 0.063'). The material is stainless steel:

488 lbm/ft3 D

=

9 Btu /hr-ft OF k

=

0.11 Btu /lbm OF c

=

p 1/16" (t = 0.005')

thickness

=

refer to Figure 14 sketch Equipment 5/6/7:

Flexible conduits, modelled as cylinders with diameters varying in accordance with actual size. For Able hoses the thickness varies between 0.1" to 0.12" and 0.11" was used for the models. For flex conduits, the thickness is 0.0625". The material is galvanized carbon steel. The zinc coating was not modelled.

487 lbm/ft3 D

=

27 Btu /hr-ft OF k

=

0.113 Btu /lbm OF

=

cp not required sketch Equipment 8:

Solenoid valve body, modelled as a cylinder with a diameter of 1.5".

The material is brass. The properties of red brass were used:

532 lbm/ft3 D

=

35 Btu /hr-ft OF k

=

cp 0.092 Btu /lbm OF

=

0.25"(t=0.021')

thickness

=

refer to Figure 11 sketch 3-

Equipment 9: Two-dimensional model of a terminal block inside a terminal box. The materials, dimensions and configuration of the equipment are listed on Figure 15. The properties of steel are as previously described for other equipment. The properties of Aluminum and Polysulfone are:

3 168 (A1),

78 (Polys.)

D (lbm/ft )

=

k (BTV/hr-f t O )

138 (Al),

0.15 (Polys.)

F

=

p (BTV/lbm O )

0.22(A1),

0.30 (Polys.)

F c

=

Equipment 10: Two-dimensional Skinner solenoid valve. The materials, dimensions and configuration are provided in Figure 16. The properties of steel and stainless steel are as previously described for other equipment. The properties of copper and epoxy insulation are:

3 558(Cu),

11.2 (Epoxy)

D (lbm/ft )

=

k (BTU /hr-ft O )

230 (Cu),

0.36 (Epoxy)

F

=

p (BTV/lbm O )

0.092 (Cu),

0.24(Epoxy)

F c

=

Correlation of the equipment listed on Table 3.4 of the MSLB superheat submittal to the above equipment types is discussed below.

Main Steam Pressure Transmitters - The transmitters correlate directly with Equipment 3.

The model used in the analysis is conservative because the thickness of the transmitter housing is approximately 0.25" instead of the modelled.0747".

Main Steam Pressure Transmitter Instrument Cable - This cable is run in solid and flexible conduit in the MST.

The thermal lag response of flexible conduit is limiting. Therefore, the cable correlates to Equipment 5 with a conduit diameter of 0.75".

When comparing the thermal response of conduit, the surface temperature of smaller conduit followed more closely the room temperature than larger conduit. Also, for a given size, flexible conduit followed more closely the room temperature than solid conduit.

It has been noted that an error existed for this equipment on Table 3.4 of the MSLB superheat submittal. 2Forthefeegwaterisolationsignal temperatures,withbreagsizes1.gft and 0.7 ft, thg temperatyres in Table 3.4 should be 250 F and 245 F instead of the 235 F and 232 F values which were incorrectly picked of f the thermal lag curves.

(A 4-

revised Table 3.4 is attached. The table has been revised to correct the above error and to incorporate additional changes identified in the follow-ing discussion).

MSIV/MFIV Solenoid Valve - The valve correlates to the curves for a Skinner solenoid valve (Equipment 10). Revised qualified and thermal lag temperature values have been incorporated into Table 3.4 based on revised qualification data and a two-dimensional analysis for this solenoid valve.

MSIV/MFIV Wiring and Lugs - This equipment is located inside terminal boxes mounted on the MSIV and MFIV actuators. The one-dimensional terminal box response curve (Equipment 2) was conservatively applied to this equip-ment.

MSIV/MFly Terminal Blocks - The terminal blocks correspond to Equipment 9.

terminalbox,itwasfoundthatresultsfromthg1.0ft}ysisforthe Based on an examination of the lumped-heat-capacity ana MSLB enveloped those of the other breaks, including the 0.7 ft break, at all times 2

until the end of the analysis for the 1.0 ft MSLB (800 seconds). For this reason, the detailed two-dimensional analysis was performed only for this break. Moreover, since the temperature of the terminal block remained below the qualification temperature for the entire duration of the two-dimensional analysis, the results were considered bounding and conservative.

t Thys the terminal block temperature response was determined for the 1.0 ft break using a two-dimensional analysis. Theequipmenttempergtures for the other size breaks were determined as follows. The 1.0 ft 2

temperature response for the terminal blocks was compared to the 1.0 ft response of the terminal box (Equipment 2).

Itwasnotedghattheterminal block response lagged the box response by approximately 85 F in the time period of interest.

Since the terminal block temperature response is drfven by the terminal box response, it was assumed that the approximately 85 F difference in temperature yould exigt between the tgrminal block and the terminal box for the 4.6 ft, 0.7 ft and the 0.5 ft cases.

In this way, the terminal block temperature values for steam line isolation in Table 3.4 of the submittal report were obtained from the Equipment 2 thermal lag curves.

1 For the feedwatgr isolation temperatures in Table 3.4, it was assumed that the 4.6 ft breaktemperaturewastgesameasforsteam/lineisolation J

(this assumption wag used for tge 4.6 ft break case for all equipment);

and, for the 0.7 f t and 0.5 ft cases, the tempegature of the terminal blgekwasassugedtoinegeaseataconstant0.65 F/second from the 1.0 value (135 F). 2 65 F/second is the maximum terminal block rise 0

ft rate for the 1.0 ft break.

5-1

MSIV/MFIV Control Cable - This cable is run in conduit and flexible conduit in the MST. The temperature correlates to the thermal lag values for 1.5" flexible conduit (Equipment 6). The submittal Table 3.4 values for this equipment have been revised to reflect actual thermal lag values for the four break sizes. The values previously provided were based on an average of thermal lag values for 0.75" and 2" flexible conduit.

MSIV/MFIV Limit Switch - A thermal lag curve was not specifically developed for a limit switch.

It was assumed that a limit switch housing thermal response would be similar to the response of the solenoid valve solenoid housing (Equipment 1). This assumption is appropriate because the thickness of a limit switch body (approximately 1/8") is equal to the thickness of the modelled solenoid valve solenoid housing. For a sketch of a limit j

switch refer to Figure 17.

l l

MSIV/MFIV Conax Connector - These connectors correlate to Equipment 4.

l MSIV/MFIV Limit Switch Instrument Cable - Portions of this cable are routed in 0.75" Able hose.

Therefore, the thermal lag response curve for Equip-ment 7 is appropriate for this cable.

J-601A Solenoid Valve - This valve correlates to the curve for a solenoid valve body (Equipment 8).

J-601A Control Cable - This cable is run in conduit and flexible conduit in the steam tunnel and correlates to Equipment 5.

I 1

Question 2 l

All assumptions used, including but not limited to the following:

2.A.

Junction loss coefficients; 2.B.

Heat transfer coefficient for heat transfer through walls; 2.C.

Condensation model used.

Response

2.A.

Assumptions used in the MSLB superheat submittal concerning mass and energy release, environmental conditions and equipment performance are discussed in sections 3.1, 3.2 and 3.3 of the submittal. Additi-onal assumptions pertinent to environmental conditions and equipment performance are:

a.

Cooling by the MST ventilation system is conservatively neglected.

b.

Owing to their low failure pressure, the MST blowout panels open soon into the transient.

Hence, they are modelled as simple open vents.

c.

Thermodynamic equilibrium exists at all times in the MST compart-ment atmosphere.

d.

The MST volume is filled with a homogeneous mixture of air, steam and water.

e.

Air is treated as an ideal gas, and steam is treated to second order in the virial expansion of the equation of state.

f.

Flows between compartments are calculated using steady state compressible flow equations for an ideal gas; inertial effects and vapor dropout are not considered.

g.

The junction loss coefficients between nodes have been calculated using simple contraction and expansion losses.

2.B.

For convection, the heat transfer coefficient was calculated based on a velocity, a characteristic length, and the compartment themodynamic conditions. Hilpert's Equation was used to evaluate the forced convection heat transfer coefficient based on a Reynolds number at film conditions.

If this heat transfer coefficient was less than its natural convection counterpart, then the natural convection heat transfer coefficient was used assuming turbulent conditions (Ref.

NUREG-0588, Rev. 1).

2.C.

For the condensing heat transfer coefficient, four times the Uchida heat transfer coefficient was used (Ref. NUREG-0588, Rev. 1).

Question 3 Analysis results:

3.A.

Compartmenttemperatureversustimecurve(peaktemperaturespecified);

3.B.

Compartment pressure versus time curve (peak pressure specified);

3.C.

Equipment temperature versus time curve (peak temperature specified) for each piece of equipment; 3.0.

Equipment qualification temperature; 3.E.

Identification of locations for A., B. and C.,

if spatially varying within a compartment.

Response

3.A.

Compartment temperature versus time curves were provided in the MSLB superheat submittal, Figures 3.2-1 through 3.2-4.

3.B.

The peak pressures achieved in the MST for the MSLB superheat analysis are provided in section 3.2 (page 4) of the MSLB superheat submittal.

These pressure values are lower than those calculated by an analysis that maximizes pressure (rather than temperature) conditions.

Therefore, reference is made to Figure 38-5 of the Callaway FSAR (Wolf Creek USAR) for the worst case pressure versus time curve for the HST.

7-

3.C.

Worst-cace equipment temperature versus time curves are provided, for each of the ten equipment types identified in the response to question 1.F., in Figures 1 through 10.

The worst-case temperature values provided in Table 3.4 of the submittal report are obtained by using the curves and the appropriate actuation time for the equipment. The actuation times, for steam line isolation and feedwater isolation, are listed'in Table III.B-4 (cases 59-63) of WCAP-10961-P except that manual steamline isolation is assumed to occur 600 seconds after reactor trip and allowance is made for steamline isolation valve closure time, i.e. the time from receipt of a closure signal until the valve is fully closed.

3.D.

Equipment qualification temperatures are provided on Table 3.4 of the MSLB superheat submittal (last column on table).

3.E.

As discussed in the response to question 1.D. above, spatially varying conditions were not assumed in the analysis.

TABl.E.I HEAT SINK PROPERTIES

~^

Thermal Heat Heat Sink Surface Conductivity D XCp Sink Material / Code Area (fte)

Thickness (ft)

(8tu/hr*F-ft)

(Btu /fts.*p) 1 Strue. Steel /l 4287.13 0.042 25.0 53.9 2

Struc. Steel /l 4300.96 0.042 25.0 53.9 3

Concrete Floor /2 945.00 2.0 0.8 30.0 4

Concrete Floor /2 945.00 2.0 5

Concrete -

3200.00 1.0 Column /2 6

Concrete -

3200.00 1.0 Column /2 7

Concrete -

3352.50 2.0 Column /2 8

Concrete -

3352.50 2.0 Column /2 9

Interior 1665.00 1.0 Concrete /2 10 Interior 1665.00 1.0 Concrete /2 11 Concrete 1639.00 2.0 Column /2 12 Concrete -

1639.00 2.0 Column /2 13 Concrete Wa11/2 1865.00 4.0 14 Concrete Wa11/2 1865.00 4.0 15 Concrete Roof /2 365.00 2.0 Y

Y 16 Concrete Roof /2 365.00 2.0 Note: Odd numbered heat sinks are in Compartment 1, and even numbered heat sinks are in Compartment 2.

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4 H:ftman NEMA Type 4 JIC Boros are designed for use in areas Y' M.- ** N"3-

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which may be regularfy hosed down or are otherwise very wet. They

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ere euttable for use in dairies, breweries, and similar installations.

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'g O These bones are fabricated from.16 gauge and 14 gauge steeland have esternal screw clamps on three sides of the sover.The screw j

clamps are evick and sesy to operate and have no loose parts.The g

continuous hinge has a stainless steel hinge pin. The solid neoprene 5:'.

Sasket is attached to the sover with oil-resistant adhesive. Cover clamps and clamp screws are stainless steel. All seems are eenhnu.

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ously welded and there are no holes or knockouts. Estornet feet are furnished for mounting. The standard finish is prey hammertene k.;

enamelineide sad out over phosphatized aurfaces. Additioneltnish-t II ing of the enterior is necessary if the hos is located in a wet area.

Weidnuts are provided in 8 a 4 and larger stros for mounhng the

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3 eptional penets and terminst kits which must be ordered separately When oreering special"CHNfr" bones, be sure to completely specify l

the hinging arrangement. These boses conform to the NEMA stand-ard for type 4 (Watertight and Dusttight) enclosures. and to JIC standard EGP 1-1967. All bones are listed by Underwriters Lahore-

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9 M FKrvRE 12 TERMINAL BOX (EQUIPMENT 2)

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Dimansions Snap-Lock LimitSwitches Ratings SPECIFICATIONS OPER ATION A1. DAT A STANDARD Heavy Duty, Machine Toot Typ,

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Double Pole, Double Throw, Quick gragog'g= 4taggeleaft,c"

'4 Make, Quick Break, Butt Type.

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.. Form "Z Contacts.

g 0 U L Listed / File No. E12967

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, Enclosure is Water, Oil and Dusttight.

fk C *- Meets (NEMA) Type 1,4, & 13 0

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j Requirements.

$ Torque Necessary for Operation of

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. External Lever is Adjustable by 7*30' A-o Increments Thru 180.

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! Ambient Temperature:.20'C to +90*C.

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Double pole, slombie break, desble amp' ' Reti 8 See Page 14 for Contact Configuration throw, hoevy sluty limit switg

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having mechanieel treest of 10' to Volts AC DC trip end with two nonneHy open 125 20 5

A. Pre Travel Trip Position..

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and M normeHy M Mts.

250 15 1.5 B. Reert Position.....

8*

Con be furnishal Wth W, 430 10 C. Total Travel 37*

600 5

D. Recommended Travel

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1 or 2mem h DIMENSIONS and MOUNTINGS

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STANDARD MOUNTING STYLE 1 MOUNTING STYLE 2 MOUNTING ORDERING NUMBERS @

C o.DEP.ING INFORM ATION Os ew

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EA17M1100 EAN2100 EA17413100 STANDARD MOUNTING (02400X)

(02400X4R)

(02400X WS)

EA170 21100 EA170 22100 EA170 23100 ETYLE NO.1 MOUNTING (02400X 1)

(02400X-14R)

(02400X 1 WS)

EA170 31100 EA170 32100 E A170-33100 STYLE NO.1 MOUNTING (02400X 2)

(02400X 24R)

(02400X 2 WS)

@ 0,oe, by New E A te. s Numbers (soid Types oia u m.. sa..n in..

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Rev. 1 3/87 Tabie 3.4: Room / Equipment Temperature (*F) at Actuation Time SLIS FWIS Qualified 2

2 2

2 2

2 2

2 BREAK SIZE 4.6ft 1.0ft 0.7ft 0.Sft 4.6ft 1.0ft 0.7ft 0.5ft Temperature Peak Room Temperature 308 392 366 323 308 295 294 290 NA Main Steam Pressure Transmitters 237 345 345 312 237 228 233 228 420 Main Steam Pressure Transmitter 248 363 358 320 248 250 245 245 34 0 Instrument Cable MSIV/MFIV Solenoid Valve (I) 132 295 318 285 132 155 161 166 328 MSIV/MFIV Wiring and Lugs 233 337 340 30 3 233 222 223 223 346 (wiring)/

352 (lugs)

MSIV/MFIV Terminal Blocks 148 250 253 218 148 135 139 144 300(2)

III MSIV/MFIV Control Cable 240 358 355 318 240 242 240 238 385(3) 4 MSIV/MFIV Limit Switch 230 336 340 306 230 223 224 224 34 2 1

MSIV/MFIV Conax Connector 248 363 358 320 248 240 243 242 420 MSIV/MFIV Limit Switch 299 382 364 322 299 287 283 283 340 Instrument Cable J-601A Selenoid Valve 230 316 320 290 230 220 219 218 335 l

J-601A Control Cable 248 363 358 320 248 250 245 245 346 4

NOTES: (1) The temperatures provided are based on a detailed, two-dimensional thermal lag analysis.

(2) Wolf Creek terminal blocks are qualified to 300*F; Callaway, to 312*F.

(3) One MSIV at Wolf Creek has cable qualified to 346*F.

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