ML19305A804

Answers to Questions About La Crosse BWR Received from Div of Reactor Licensing. Two Oversize Drawings Encl

ML19305A804
Person / Time
Site:	La Crosse File:Dairyland Power Cooperative icon.png
Issue date:	06/30/1966
From:	ALLIS-CHALMERS CORP.
To:
Shared Package
ML19305A803	List: ML19305A802 ML19305A804
References
ACNP-66541, NUDOCS 8003180371
Download: ML19305A804 (17)

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{{#Wiki_filter:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - o!Xy'oY ALLIS-CHALMERS MANUFACTURING COMPANY i 1 RECEIVED J'J!i 1 4 1986 Juno 7,1966 in reply refer to: LAC-3367 l ~ i Doiryland Power Cocperative La Crosso Boilina Vioter Reactor Nuclear Power Plant Post Offico Box 135 Gence, Vliscomin 54632 Attention: Mr. R. E. Shimshok, LACBWR Superintendent LACBWR - Operating Authoricotten, Amendment 24 l

Subject:

Deer Mr. Shim:hok: Vlo cre onclosina for your information end files two (2) copics of ACNP-66541. report includes answers to Cuestions 16 and 17 roccived Deceml>2r 2,1 Division cf Reacter Licensing. It also includes omwcrs to Cuesticm 4, 5, 7, 8, 9, j 10,12,13,14, and 15, os generated and presented crolly to Allis-Cholmer, at t y rac tin; hold at the Bethesde hecdqucrt:rs of the Division of Peccier Liceming. This information is submitted os Amendment 24 to Comtnaction N April 29,1966, CAPR-5. Very truly yours, VI.S.Fcrmer LACBY.R Project Moroger Y/SF:sig Enclosurss: 2 Mr. J. P. Mcdaolt cc: JPV

ACNP-66541 l COPY N O. GL

,.)

,./ ,1 / ANSWERS TO QUESTIONS ABOUT LACBWR i/ RECEtVED FROM THE DIVISION OF REACTOR LICENSING s PRESENTED HEREIN IS A

SUMMARY

OF NEW QUESTIONS GENERATED DURING THE DRL/A-C MEETING ON APRIL 29,1966 (GROUP V) AND ANSWERS TO GROUP V: QUESTION S 4, 5, 7, 8, 9, f [ 10,12,13,14,15, and l GROUP Ill: QUESTICNS 16,17 i l (RECEIVED DECE6GER 2,1965) i i O e<ege ed ror The United States Atomic Energy Commission under AEC Contract No. AT(ll-1)-850 Submitted cs Amendment No. 24 to Construetion Autherization l No. CAPR-5 June 1966 ALLIS-CHALMERS Atomic Energy Division 6935 Arlington Roed Bethesda, Maryland 20014

s nU QUESTION lil-16 Provide on evoluotion of the possibility of demoging the containment building by missiles generated by the equipment inside and outside the containment. This should include rototing machinery, instrument wells, volve stems and other items that are installed in the high pressure systems. ANSWER 111-16 There is no evident rotating machinery or equipment associated with the high pressure steam system and located outside of the containment building which covid pose o threat to the containment integrity. The probability of unrelated missiles, such as on airplcne, { striking the building at the some time that high activity is being released is remote. l l The equipment inside of the containment building has been reviewed to determine those items which might become hozordous missiles. The possibility of such missiles penetrating the containment building hos been investigated analytically. It is concluded that penetration would not occur.

1. GENERAL, EVAL.UATION r~T LJ The generation of missiles through high speed rotating equipment is not possible since this type of equipment is not located within the containment building.

The shutdown condenser is the or ly piece of primary system equipment above the elevo-tion of the main floor. Because the shutdown condenser system is near the unprotected -dome of the containment building and is not surrounded by structural concrete, com-ponents of this system have been considered to be potential missiles and were analyzed. Other high pressure portions of the piimary system (including the reactor vessel, steam line piping, recirculation loop piping, and pumps) are enclosed by structural and biological shielding concrete, and it is considered very unlikely ihot any of the associ-oted equipment would generote dongerous missiles that could reach the containment building shell. Nevertheless, on onelysis was performed to evolucte the effects of the vessei head flying off due to rupture of the retaining studs. The only auxilicry com-ponents subject to high operating pressures and not surrounded by substantial amounts of concrete include the emergency core spray system and portions of the purification system. There are at least 9 in. of concrete between these systems and the containment woll; and this concrete would prevent containment demoge due to any missiles formed. 111 - 1 6 - 1

t l A \\ LJ l

2. ANALYSIS OF MISSILES FROM SHUTDOWN CONDENSER SYSTEM l

The components of the shutdown condenser system that were onelyzed as being potentially hozordous missiles are the following: l (1) primary steam shutoff volve i (2) shutoff volve bypass equalizer volve I (3) primary steam inlet control volve (4) primary vent control volve (5) primary level gouge vent plug (6) primary inter thermal well (7) primary inlet spare thermal well [ (8) condensate return thermal well O The veiecitx ther ceuid be ettorned bx each er these getentioi missiies wes ceiceiet=d and compared with the critical velocity recuired for penetrating the containment building. The potential missile velocities were evoluoted by the following equation *: I f V) f V1 g 1 - In 1 =K I ( V j ( V,j r, + x ton s f wherc: f V1 f V1 K In 1 d 2 Kg = (1 - + V, j i Vj r, g pAA g K2* m y ton s

• ORNL-N51C-5, Cottrell, W. B., and Savoloinen, A. W., et al, U. S. Reactor g

Containment Technology,(Volume 1), Nuclear Sofety Information Center, Ook Ridge National Laboratory, August 1965. l l lll-16-2 1

^ (d n A = iet orifice (rupture) orco, it' o 2 cross-sectional area of missile, It A, = = mass of missile, slugs m = radius of orifice, ft ro Vg = iet velocity at orifice, ft/sec V = missile velocity at distance x from orifice, ft/sec V, = missile velocity at orifice, ft/sec distance of missile from orifice, ft x = S = one-half [et expension angle, degrees 3 pg = mass density of jet fluid, slugs /ft The volve of x ton s in oil cases wo, conservatively assumed to be much greater than O

r. The iet exeensioe omeie -es towee te he 60 dee for the encenrie=d end encontreiicd o

expansion and with the jet issuing from o rogged opening. The jet velocity at the point of rupture (orifice) was determincd using Fig. 6.40 of the reference, extropolating to a pressure of 1400 psi. The equation used to determine the missile velocity required to penetrate the containment building is given in the reference as: E 5 (16,000 T2 + 375 WT) = D 46,500 l where: D = missile impact diometer, inches E = kinetic energy requireJ for penetration, ft-lb S = ultimate tensile strength of target, psi target thickness, inches T = i O W length of side of square window used in penetration experiments = V performed to obtain above equation, inches ill-16-3

i )nU The thickness of the containment building (torget) is 0.60 in. The ultimate tensile strength of the containment building wall (ASTM A 201 Grade B) hos a range of 60,000 - 72,000 psi. A value of 60,000 was used in the calculations. As stated on page 6.163 of the reference, o value of W equal e 8D was used. As shown in Table 111-1 6.1, the velocities required to penetrate the containment building wall were found to be much greater than the velocities ottoined by the missiles. It is therefore concluded that these missiles would not penetrate the containment building. TABLE lll-16.1 EVALUATION OF POSS!BLE MISSILES IN CONTAINMENT BUILDING maximum velocity velocity required missile ottoined, ft/see for penetration, it/see steem shutoff volve. 20 160 bypass equalizer volve 20 330 inlet control volve 25 203 vent control volve 15 530 vent plug 80 1400 inlet thermal.vell 100 510 Inlet spore thermal well 120 620 condensate return thermal well........ 100 510 3. ANALYSIS OF MISSILE DAMAGE DUE TO RELEASE OF THE REACTOR HEAD For the analysis, it is postulated that the top head of the vessel breaks away from the cylindrical port and is propelled upward by the high pressure steam escoping from the vessel into the upper vessel cavity. This stcom also begins to exert on upward force on the upper shield plug. Calculations have determir.ed that the vessel cicsure head strikes the plug with a relative velocity of 400 ft/sec. During the short time to impoet, the shield plug has attained a velocity of only 25 ft/sec and hos risen less than 10 in. The heavy shield plug thus provides a missile barrier to the closure head. It is felt that the collision of the ves:el head and shield plug would cause shottering of the plug (if only limited shottering occurred, further shattering or reduction of velocity (3 v I!!-16-4 L

1 1 (O would be expected when the shield plug hit the building crone). It is difficult to predict the shapes and velocities of the resulting pieces of concrete, 'but if we casume on inelostic collision between the head and plug, velocities in the order of 80 ft/sec could result. Various missile shapes and sizes were considered, and the required penetration velocities were calculated using the some equation as before, which is derived from experimental 'f data for tool steel missiles, and is thus very conservative for concrete proicctiles. The velocity required to cause penetration of the containment building would be o minimum ) of 185 ft/sec if it is assumed that the plug remains intact and is of hard steel rather than { concrete. Greater velocities would be required for the smaller fragments actually formed. it is concluded that no penetration could occur, u 4 O i 't/ 111 -1 6 - 5 ?

~ SPENT FUEL ~ STORAGE WELL EXCITATION g TURBINE BUILDING SWIT,CHG EAR ~ \\ \\ RESERVE =7 y / s EXCITER E / \\ E ,'/'/ \\ / /// / / / / / / /g {j __I -- O' @' %d i

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=, / / I R y 7-/ / / / / / / -/////2 9 60,000 K W CONDENSER 'k TURBINE & EXHAUST CONTAINMENT BUILDING l (7-2400 VOLT 2400 VOLT _ or SWITCHGEAR IB SWITCHGEAR 1 A ) l vi a GENERATOR PLANT c) ' ~ J' g ~' i_ & REACTOR PLANT%" CONTROL ROOM , r V _ N _ N,xj _ C,0NFERENCE ROOM d _._, 7__- - - 7, - / z \\ AEC E[- - ( OFFICE _ ./, C, O '%IN FLOOR OF TURBlNE BLDG, EL. 668' -0" FIG. 10.1

-l ,o. O 1 ALLIS-CHALMERS 4 MANUFACTURING COMPANY i-l GENERAL DESCRIPTION l STEAM TURBINE The condensing high-pressure steam turbine-generator unit furnished is of the straight reaction tandem compound type. It consists of a 3600-rpm single-flow high-pressure element and a double-flow low-pressure element (arranged so as to provide opposed-steam-flowin the LP clement)directly connected to a two-pole, j i sixty cycle, three phase hydrogen-cooled generator. The low-pressure element j exhausts to a condenser. The generator has a supercharged rotor which is con-nected to a main exciter turough a reduction gear. The blading in both the high-pressure and the low-pressure elements is of the straight reaction type. The three main rotating elements are connected by rigid couplings and sup-ported by six journal bearings which are self aligning. The thrust of the entire shaft system is taken by a pivoted-pad thrust bearing -l assembly located in the No. I bearing pedestal. f) l v 3 All bearings, the governing (control) system and the hydrogen seal system receive oil from a main centrifugal type pump whichis mounted in the No. I bear-ing pedestal and driven directly from the turbine shaft. During starting or stoppir.g operation, oil is supplied by a full capacity sub-merged centrifugal main auxiliary oil pump, driven by a motor; or by a reduced capacity motor driven centrifugal oil pump for turning gear operation and a re-duced capacity motor driven centrifugal oil pump for hydrogen seal operation. A reduced capacity de motor driven centrifuga1 oil pump is provided to supply bear-ing oil and a reduced capacity de motor driven centrifugal oil pump is provided to supply hydrogen seal oil in case of an emergency when all other pumps fail, such as in the case of the loss of the ac auxiliary power supply. 1 The oiling system furnished on the unit consists of an oil reservoir, twin main oil coolers, regulating valves and the necessary oil piping for lubricating each bearing and for operating the various hydraulic devices. Sight flow indicators are Provided to assure that lubricating oil is being supplied to each bearing. Auto-l matic pressure switches for starting the motor driven auxiliary oil pumps are also i furnished as part of the equipment. The piping between the oil coolers and the turbine oil system is furn.shed with the unit.

ALLIS-CHALDERS as OANUFACTURING COMPANY /. i.. i / [/ GENERAL DESCRIPTION j i STEAM TU RBINE i i The oil opera;cd speed governing system on the turbine unit is arranged for I accurate automatic control of the speed over the entire capacity range of the unit. { However, in normal operation, the speed governing system will be under initial-pressure contro1with provisionfor the speed governor to override the initialpres-sure regulator in any position to prevent dangerous overspeed, if the generator load should become disconnected. The high-pressure steam supply to the turbine unit is controlled by two gov-erning valves located in a separate steam chest manifold assembly, below the floor line and just in front of the No. 1 pedestal. These valves are controlled by an oil operated oil relay type governor gear. An oil operated power cylinder assembly is provided to open and close the valves in response to the demands of the speed governor. The steam supplied to the turbine is carried from the two governing valves in J'] the steam chest assembly to the lower half of the HP turbine by two flexible "U" U Here it passes through two ports in the outer and inner cylinders to the bends. full-admission inlet area in the HP inner cylinder. With the straight-reaction design, all steam enters the first stage of bladini; 1 and no by-pass arrangement is provided. A hydraulically operated stop valve is located in the steam chest assembly s and it is provided with an above-seat drain and a below-seat drain. After the steam has passed through the high pressure section of the HP tur-bine, it is led out (at the reheat diaphragm)through two ports anda piping arrange-j ment to a moisture separator. Two by-pass lines with relief-dump valves are taken off of the above piping arrangement and connected into the condenser through the LPturbine exhaust con-j j l nection. l I reheater) This permits dumping the bottled-up steam (stored energy in the excessive overspeed in case the intercept directly into the condenser to prevent valves fail, and also provides protection against excessive pressure build-up in This arrangement withthe a the reheat system when the intercept valves function. j two relief-dump valves permits the by-pass system to be exercised while the unit s,) is carrying load. {

i9 I ALLIS-CHALMERS As MANUFACTURING COMPANY In q l .-3 / GENERAL DESCRIPTION ,l jl STEAM TURBINE l i J I, The oil operated speed governing system on the turbine unit is arranged for fI accurate automatic control of the speed over the entire capacity range of the unit. y l the speed governing system will be under initial-However, in normal operation, Q pressure controlwith provisionfor the speed governor to override the initial pres-sure regulator in any position to prevent dangerous overspeed, if the generator E j load should become disconnected. The high-pressure steam supply to the turbine unit is controlled by two gov-erning valves located in a separate steam chest manifold assembly, below the floor [ line and just in front of the No. 1 pedestal. These valves are controlled by an oil operated oil relay type governor gear. 1 y An oil operated power cylinder assembly is provided to open and close the valves 1 in response to the demands of the speed governor. .e N The steam supplied to the turbine is carried f rom the two governing valves in ,] p the steam chest assembly to the lower half of the HP turbine by two flexible "U" G' Here it passes through two ports in the outer and inner cylinders to the j bends. 4 full-admission inlet area in the HP inner cylinder. I With the straight-reaction design, all steam enters the first stage of blading and no by-pass arrangement is provided. 4 = ) A hydraulically operated stop valve is located in the steam chest assembly i and it is provided with an above-seat drain and a below-seat drain, l After the steam has passed through the high-pressure section of the HP tur-j l bine, it is led out (at the reheat diaphragm)through two ports and a piping arrange-h j ment to a moisture separator. I Two by-pass lines with relief-dump valves are taken off of the above piping i arrangementand connected into the condenser through the LP turbine exhaust con-j nection. 1 reheater) This permits dumping the bottled-up steam (stored energy in the [ l directly into the condenser to prevent excessive overspeed in case the intercept valves fail, and also provides protection against excessive pressure build-up in ) } l This arrangement with the the reheat system when the intercept valves function. j two relief-dump valves permits the by-pasu system to be exercised while the unit l t/ is carrying load. I b I h

MANUFACTURING C00PANY 4 f ALLISoCHALOERS as GENERAL DESCRIPTION .F STEAhi TURBINE t The moisture separator removes excess moisture entrainedin the steam. The l dry steam passes to the reheater whe: e the tempe rature is raised. i each with an intercept The reheated steam then passes through two lines, valve, to the two inlet ports in the IP section of the high-pressure turbine (after [ the reheat diaphragm). The inlet ports are located in the lower half of the cylin-I der of the HP turbine. If the turbine unit should speed up i Normally the intercept valves are open. after a load dump, the intercept valves will close at 103% speed to isolate the re-heater steam and prevent ove rspeeding the unit. After the steam has passed through fg the IP section of the high-pressure turbine, it is led out through two side cross-j under pipes into the inlet ports of the double-flow LP turbine. From this point, the steam flows in opposite directions through several stages of reaction blading and then exhausts to the condenser. G When the turbine unit.s tripped, the stop valve, governing and intercept valves i l close and shut off the steam supply. The turbine unit is anchored to the foundation near the centerline of the LP turbine exhaust and the expansion is in both directions from that anchor point. The 4 Allis-Chalmers non-sliding pedestal design is employed on all pedestals. The No. 1 bearing pedestal is anchored to the foundation and the high-pressure end of the HP turbine cylinder is supported on this pedestal and slides on spherical self-The low-pressure end of the HP cylinder is anchored to aligning support blocks. l and supported on the exhaust end of the LP turbine in such a manner as to permit j and at the same lateral movement due to temperature changes in the cylinder f l time, prevent axial movement with respect to the LP turbine The general arrangement of the turbine is shown by the cross-sections fol-i The maximum operating steam conditions with the maximum short time lowing. swings are given under OPERATION - Pressure and Temperature Limitations. ) 1 e i I v t_ I

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Y p C1LE55-CHALOERS as MANUFACTURING C00PANY . m u _ _. __. C'\\ - \\ /' MAJOR TURBINE COMPONENTS BLADING The blading in the turbine is made up of rows of reaction blading to the ex-haust with a reheat diaphragm between the HP and IP sections. The reaction blad-ing consists of a11 milled blades in the spindle bodies and both milled and cast type in the cylinder casings. This blading has either riveted or welded shrouds for all of the rows except the two outer rows on each end of the double-flow LP spindle, which require no shrouds. The shrouding of this blading seals with cooperating seal strips of the radial clearance type, except for the shroudless rows of blading (referred to above) which require no seals. The last two rows of cylinder blades of each half of the LP turbine have radial seals in their shrouds. O J i L h o a ._.--..--_--.-_--.-4

f. [ L. ALLIS-CHALMERS $... MANUFA4fURING ...~- ~ . ---..-.~ ~. ...s..... _,_ j .--..a. l REACTION BLADING SIIOWING REPLACEABLE RADIAL, tl HEAT-DISSIPATING STEAh! SEALS k t k [. RADIAL CYLIN DER SEALS m p 5 e O f / 1 o 1 f Y p / ? SN e i f A ,u, r SPINDLE RADIAL SEALS l O .___._-. -005-154 03 l l

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