ML19344A860
| ML19344A860 | |
| Person / Time | |
|---|---|
| Site: | Duane Arnold  |
| Issue date: | 07/17/1978 |
| From: | Leslie Liu IES UTILITIES INC., (FORMERLY IOWA ELECTRIC LIGHT |
| To: | Case E Office of Nuclear Reactor Regulation |
| References | |
| REF-GTECI-A-36, REF-GTECI-SF, TASK-A-36, TASK-OR IE-78-1073, NUDOCS 8008220368 | |
| Download: ML19344A860 (51) | |
Text
{{#Wiki_filter:. IOWA Etscraic IIGHT AND POwnn COMPANY General Quice CEDAR RAPIDS. IOWA LEE LIU semoancz enzsmem_ esammenma July 17,1978 IE-78-1073 c' pl (,g (: '
,,f 33' Mr. Edson G. Case, Acting Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Comission Washington, D.C. 20555
Dear Mr. Case:
A letter from Mr. Victor Stello, Jr. , dated May 17, 1978, requested additional information regarding procedures and plant systems for movement of heavy loads near spent fuel. Transmitted i with this letter are the responses to the information requested in j the enclosure to the May 17, 1978 letter. l l One signed original and 39 copies are transmitted here- I wi th. Sincerely yours, Lee Liu l Senior Vice President-Engineering l l l LL:D cc: R. Salmon
.D. Arnold l R. Lowenstein R. Clark (NRC)
L. Root File A-105 MM
- 1. Provide a diagram which illustrates the physical relation between the reactor core, the fuel transfer canal, the spent fuel storage pool and the set down, receiving or storage areas for any heavy loads moved on the refueling floor.
RESPONSE
Drawings C-429 and C-430 are included which show the relationship between the Reactor, the Steam Dryer and Separator Storage Pool, the Spent Fuel Storage Pool and the Cask Storage Pool.
- 2. Provide a list of all objects that are required to be moved over the reactor core (during refueling), or the spent fuel storage pool. For each object listed, provide its approximate weight and size, a diagram of the movement path utilized (including carrying height) and the fre-quency of movement.
RESPONSE
The following is a list of objects that are required to be moved over the reactor core during refueling. f Approximate Approximate Object Size Weicht Control Rod 10"x10"x14'-8 200 pounds Fuel Bundle 5.4"x5.4"x14'-8 780 pounds LPRM 1"0x40'-0 400 pounds Maintenance Platform & Support 16'-00xl'-8 5 tons Moisture Separator 13' -70x16 '-1 39 tons Steam Dryer 15'-00x17'-6 24 tons Reactor Head 15'-00x7'-8 48 tons Dryer Separator Shield Plugs 13'-0x3'-0x33'-0 76 tons Movable Source Range Detec-tor (Dunking Chamber) 6"x6"x14'-0 100 pounds Sipping Machine l ' - 5 xl ' -4 x2 ' -9 135 pounds
The following is a list of objects that are required to be moved over the Spent Fuel Pool (SFP,). Approximate Approximate Height Over Objpct Size Weight SFP Floor Frequency Pool Gate 6'-0x1.75"x26'-0 11,200 lbs. 14'-0 Refueling Pool Gate 4'-0x1.25"x25'-0 5,100 lbs. 14'-0 Refueling Worktable 4'-lx3'-7x15'-1 760 lbs. 40'-0 Once for Pemoval New Racks 6'-4x6'-4x16'-0 16,500 lbs. 40'-0 Once for In-sta11ation Old Racks 2 ' -Ox10 ' -O x16 ' -0 2,020 lbs. 40'-0 Once for Removal LPRM Section 1"0x5'-0 50 lbs. 40'-0 For Storage Control Rod 10"x10"x14'-8 200 lbs. 25'-4 Infrequent Dunking 6"x6"x14'-0 100 lbs. 40'-0 Full Unload Chambers Full Refuel Sipping l'-5x1'-4x2'-9 135 lbs. 40'-0 To test for Machine Fuel Failure Drawing APED-A61-5-4, which shows laydown areas on the refueling floor is included.
- 3. What are the dimensions and weights of the spent fuel casks that are or will be used at your facility?
RESPONSE
Iowa Electric, at this time, does not intend to move fuel elements from the SFP for any reason in the near future. Therefore, the dimensions and weights of the Spent Fuel Casks have not as yet been determined. This information will be provided prior to the first movement of a diipping cask.
'4 Identify any heavy load or cask drop analyses performed to date for your facility. Provide a copy of all such analyses not previously sub-mitted to the NRC staff.
RESPONSE
Please refer to page 16 of report, " Design and Safety Evaluation for Replacement of Spent Fuel Storage Racks", transmitted via Iowa Electric letter dated Octobcr 13,1977 (Rev.1 dated June 6,1978) from Mr. Lee Liu to Mr. Edson Case.
- 5. Itentify any heavy loads that are carried over equipment required for the safe shutdown of a plant that is operating at the time the load is moved. Identify what equipment could be affected in the event of a heavy load handling accident (piping, cabling, pumps, etc.) and discuss the feasibility of such an accident affecting this equipment. Describe the basis for your conclusions.
RESPONSE
It is presently intended that 'P.ere will be no heavy loads carried over operating equipment required for the e .fe shutdown of the DAEC.
- 6. If heavy loads are required to be co ried over the spent fuel storage pool or fuel transfer canal at your facility, discuss the feasibility of a handling accident which could result in water leakage severe enough to ur. cover the spent fuel. Describe the basis for your conclusions.
RESPONSE
Please refer to page 16 of report, " Design and Safety rwaluation for Replacement of Spent Fuel Storage Racks", transmitted via I~.a Electric letter dated October 13,1977 (Rev.1 dated June 6, lo sj from Mr. Lee Liu to Mr. Edson Case. Also, refer to Item No. 2 e this report which lists all of the material which is carried over '.ne Spent Fuel Pool (SFP). For-the rack replacement procedure, please refer to Item No. 7 of the enclosure to Iowa Electric letter dated MarcL 14, 1978 from Mr. Lee Liu to Mr. Edson Case. That letter transmitted additional information requested on the replacement of spent fuel storage racks.
- 7. Describe any design features of your facility which affect the potential for a heavy load handling accident involving spent fuel, e.g., utilization of a single failure-proof crane.
RESPONSE
Refer to DAEC FSAR Section G.13 for a description of and the use of cranes in the Spent Fuel Pool area. The Cask Storage Pool is physically separatcd from the Spent Fuel Pool (SFP) which eliminates the necessity of the heavy cask load being moved over the SFP.
- 8. Provide copies of all procedures currently in effect at your facility for the movement of heavy loads over the reactor core during rofueling, the spent fuel storage pool, or equipment required for the safe shutdown of a plant that is operating at the time the move occurs.
RESPONSE
A copy of the DAEC refueling procedure is included.
- 9. Discuss the degree to which your facility complies with the eight (8) regulatory positions delineated in Regulatory Guide 1.13 (Revision 1, December,1975) regarding Spent Fuel Storage Facility Design Basis.
RESPONSE _: Please refer to Appendix G.13 of the DAEC FSAR. I 1
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w-SECTION III REFELI:TG ASSOCIATED OPERATIC::S I:IST?.UCTIC::S I l l 1 I l l l 1 1 l
- - - - - - - - ~ - - .
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- ( ,) III. REFUELING ASSOCIATED OPERATIONS INSTRUCTIONS A. REMOVE SHIELD BLOC'G Each shield block is constructed with one or more lifting rings to accept a 4
clevis so that it can be lifted with the main crane. Slings should be selected to lift safely' the individual blocks whose veights are as follows: Shield Bleek Nu=ber Tons Per Block Fuel pool canal shield block Lover separator /d.ryer pool block Upper sepa ator/d=yer pool block Lower vessel vell plug
. 7 Upper vessel vell plug D
Because of the tre=endcus veight of the shield blocks, they must be arranged so as not to exceed the design floor loadings as they are removed. Refuel-ing Equip =ent Storage drawings show where each shield block should be placed during refueling. This layout is recen= ended in light of floor loadings, 1 maxi =u= crane travel, and efficiency of refueling operations. These three factors must each be carefully studied prior to deviating from the reco== ended layout, if such need arises. 1 I The order of re= oval is as follows.
- 1. Upper vessel vell plugs p;
.._ 2. Lower vessel vell plugs v
III-1 I l
- - . , . -- ~.
; 3. Separator / dryer pool blocks 14 . Fuel pool ce.nal biceks 4
B. VENT GAS FRCM REACTOR HEAD As the reactor is depressurized, gases which has been dissolved in the water will escape, forming a. bubble of noncondensible gases in the vessel head. To preclude the escape to the atmosphere of these potentially radioactive gases as the head is lifted, the following ventin5 procedure should be executed:
- 1. Following resetor shutdown, co==ence vessel cooldown and pressure blevdown as no. 1 C1 2.
V Raise the reactor vnter level to the vessel flange using the most feasible =ethed availrble at that time. CAUTIO:i: Tollov vessel tenperatures during this step. Be particularly careful as the water level reaches the flance so that ther=al limits are not exceeded.
- 3. After reactor pressure reaches atmospheric, open the reactor head vent valves. This vill vent any gases present in the head to the dryvell i
atmosphere. , O
, v
.' III-2
- k. Continue to raise the water level very slowly to preclude pressurin-ing the reactor. Note the level en the vessel flooding level indicator.
i When that indicator reads upscale, watch for a change in the Dryvell Equipment Drain Su=p Flov Recorder. (This vill indicate that all gas has been forced out of the vessel head and that water is passing through the vent line.)
- 5 Terminate the addition of water to the vessel and reject vater to lover the level to below the main stea= lines.
- 6. close vent valves in preparation for MsI7 air leakage testing.
C. RDIO7E DR'"aEL :. _AD
~ ;(
The dryvell head is held in place with 192 bolts. The end of each bolt is leveled so as to direct it squarely into its mating thread. The bolt end is slotted so that when removed, the bolt can be lifted and set into a re-tainer ring, held in place by the slot. A strongback is provided for lifting the k0 ten dryvell head. e s The drvvell is de-inerted prior 'to removing the head. As a precaution, the oxygen concentration in the reactor well should be measured as the head is lifted. The head should be located on the refueling floor as shown by the equipment storige drawing. 4 D v . III-3
9 i * ,/ . ',v D. REMOVE VESSU,EEAD, STUDS, STUD UUTS, /JID FI).NGE 0-RINGS 1.. Prerequisites Prior to removins or installing the RPV head, the following must be completed:
- a. Reactor water must N lowered to i==ediately below the level of the RPV flange,
- b. Vent and head cooling system piping and instru=entation leads must be disconnected and re=oved from the flanges on the RPV head, and the flanges sea 2ed.
- c. All surfaces in the reactor well and dryer-separator storage pool ID to be ficcded =ust be cleaned and hosed down.
non: Deleted . . e ,
- 2. Special tools and equipment required:
- a. Head Stud Tensioner Assembly .
- b. Stud Handling Tool
- c. Stud Wrench
- d. ' Nut Runner v
III-b 9_;4_74 , Re /. 2 1 l I
(~'g - ' e. Stud Thread Protectors
\s'
- f. Head Guide Caps
- g. Bushing Wrench
- h. Seal Surface Protector
- 1. Heat Nut and Washer Rack
- j. Head Stud Rack
- k. Vessel Nut Handling Tool
- 1. Head Strongback
~
- m. Pin Insertion Tool (supplied with Head Strongback, above) '
3 Vessel Head Eeroval The.followin5 are general instructions on the renoval of the reactor pressure vessel head. For more details consult General Electric manual ( _ titled: Operation and Maintenance Instructions - Reactor Assemb3y - GEF-166kO.
- CAUTIO:i: Do not loosen closure studs until the water temperature in the vessel is below 200 F and.the pressure is reduced to O psiS . The minimum vessel netal te=perature for unbolting is-100 F. The upper vessel and closure head shall not be cooled belov LOO OF at any time when bolted.
- a. Using the reactor building main crane and stud tensioner assembly, loosen the vessel head studs in proper sequence.
O
<d III-5 9-24-74 Rev. 2 4 3..4,...h-ma M .syd % -m M)Ws '*
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- b. Using-the nut vrench and nut handling tool, remove the head nuts and washers. Store in th'e head nut and washer rack. !
NOTE: The. studs, nuts, and washer sets are numbered serially'in accordance with the hole location in which they are installed. In storing the nuts and vashers, keep matched sets together in the same racks.
- c. Remove the studs in line with the refueling slot. Proceed as follows:
(1) Renove the threaded plug from the top of each stud. (2) If required, use the stud vrench to loosen the studs. 1 l (3) Thread the head stud handling tool into the top of each stud I l in sequence. Unthread the stud from the flange, and after the threads are free, lift the stud out of the vessel flange using
, the reactor building auxiliary crane. .
(h) Store the studs in the head stud rack.
- d. Using the reactor building auxiliary crane, transport each head nut and vasher rack and the head stud rack to the storage area on the refueling floor.
III-6 9-24-74 Rev. 2
- s
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d.1 Install the head align =ent sleeves on two diametrically opposite studs.
- e. Install the stui thread protectors on the remaining studs.
i l l l III-6a 9-24-74 Rev. 2 y ,.a , a .ge' m k . Ls L E O- **= ' ' ~
#'s f. Attach the reactor building main crane hook to the head strongback J
as follows: (1) Verify that the two centerplate hook pins on the head strongback are retracted onto the pin supports. (2) Lower the, crane hook'into the strongback hook base. NOTF.: The semicircular' groove in each hook pin must be facing downward prior to the performance of Steps f.(3) and f.(h). (3) Using the pin insertion tool, push one of the two hook pins
/*h tj through the centerplate. Secure the ball-lock pin through the opening in the end of the hook pin to secure the hook pin in place.
(h) Repeat Step f.(3) for the second hook pin.
- g. Operate the crane as required to raise the head strongback off the operating floor approxinately h feet. ,
- h. At each of the four lifting ams on the strongback, move the vessel turnbuckle assembly from the stowed position to the downward-handing lifting position.
O III-T , l 4
p - 1 O J NOTE:
-- The vessel head turnbuckle is the inboard of the two turn-buckle assemblies at the end of the lifting arm. The out-board assembly is used to transport the dryuell head and must remain stowed on the lifting arm during this procedure.
- 1. Using the reactor building main crane, carefully lift the' head strong-back and position it over the reactor well.
NOTE: Two technicians are required in the reactor vell for the
, perform 5nce of Steps j. and k.
- j. Carenilly 1cuer the head strongback into the reacter well and manually align the lifting arms with the lugs on the vessel head.
(n; V v .
- k. With the lifting ar=s properly positioned, asse=ble the four turn-buckle assemblies to the four shackles on the vessel head lugs.-
NOTE: Radiation monitoring personnel must be present during performance of the following steps. -
- 1. With all personnel clear of the reactor well, carefully lift the strengback and vessel- head off the vessel flange.
- m. Carefully raise the vessel head " cut of the reactor *.:c11, and trans-port it to the head holding pedestals on the operating floor.
A T) 9-24-74 lII-6 Rev. 2
I i NOTE: Prior to lowering the vessel head onto the pedestals v (see Step n), lay new vessel head flange 0-rings on the operating floor within the pedestals to facilitate sub-sequent installation into the vessel head flange (see, Step t).
- n. Carefully lover the vessel head and seat it on the head holding pedestals.
- o. With the vessel head properly seated, lover the crane hook as re-quired to slacke's the cables.
NOTE: If the strongback is to remain attached to the vessel head until the head is reinstalled, omit Steps p. and q. below. OO
- p. Disasse=ble the turnbuckles from the shackles on the vessel head lifting lugs. Stow the turnbuckle asse=blies in their stowed posi-tions on the head strongback lifting arms.
4 q. Operate the crane to carefully raise the head stron6back, and r.ove it to its stora6e area on the refueling floor. 4
- r. Slacken the crane cable. Disengage the ball-lock pins from the
; ends of the head strongback hock" pins, and using the pin insertion tool, push the hook pins onto the pin supports to free the crane hook from the hook box.
}
III-9 9_24_74 Rev. 2
() s. Raise the hook out of the hook box. NOTE: Im=ediately following RPV head re= oval, install the flange seal surface protector.
- t. With the vessel' head resting on the head holding pedestals, proceed as follows to replace the vessel head flange 0-rings.
(1) Remove the old vessel head flange 0-rings, and thoroughly clean the flange 0-ring grooves. Do not use tools which vill scratch or gouge the grooves. (2) Inspect the new O-rings for defects. NOTE: To prevent danage, the 0-rings must be handled in a horizontal fully supported position. Personnel handling 0-rings must wear soft lint free gloves to prevent tarnishing the silver plated surface. l (3) Place the new O-rings in the vessel head flange grooves, using the retainer clips provided. k) \s 111-10 l
E. REMOVE STEAM DRYER ASSEMBLY -]J
- 1. Prerequisites
- a. The RPV head must be removed and stored on the operatin6 floor.
- b. The dryer -seperator canal shield blocks must be removed fro = be-tween the reactor well'and the dryer-separator stora6e pool and stored on the refueling floor,
- c. The reactor vell (and dryer-separator pool) must be drained to the level of the RFY flange.
A .q) 2. Special Equip =ent The d fer-separator sling; and the pin insertion tool supplied with the
-sling are required for steam dryer assembly removal and installation.
- 3. Stes: D:fer Assently Re= oval Proceed as follows to remove the steam dryer assembly: -
- a. Attach the reactor building main crane hook to the dryer-separator sling as follows:
(1) Verify that the two hook pins on the sling hook box are re-tracted onto the pin supports.
>D
?!) III-11 . g e 6 W- m.... - ~ - ~ '
.~ ~ .. . . - . _ . .. _.-___ _ _ __ _ _ /~N (2) Lover the crane hook into the slot on the hook box.
U. NOTE: The semicircular groove in each hook pin must be facing downward prior to the performance of Steps a(3) and a(h) below.
.(3) Using the pin insertion tool, push one of the two hook pins through the hook box.
(k) Repeat Step a(3), above, for the second. hook pin. NOTE: During the performance of Step b belov, one technician must hold the pneumatic control box as the sling is () transported. The control box vill be operated from the VJ / . operating (refuelin5) floor during the steps that follow. I
- b. Operate the crane to transport the slin6 over the reactor well.
- c. With one technician on the refueling floor holding the sling control
, box, and with the sling suspended over the reactor well, test-operate the slin5 as follows to demonstrate operational readiness.
(1)' Connect' the control box to a source of 100 psi service air from the refueling floor.
- (2) With the control box control valve in the, IUSERT position, check ;
the four pressure cauge's on the control box, nnd verify that all four air cylinders' on the sling are pressurized. 9-24-74 III-12 Rev. 2
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(3) Observe the four pressure gauges on the control box, and verify that the four lifting pins have inserted through the sockets. (4) Move the control box control valve to the RETRACT position. Check the pressure gauges, and verify that control pressure has been relieved. Observe the pressure gauges and check that the four lifting pins have retracted out of the sockets.
- d. Operate the main reactor building crane to. lover.the sling down into the reactor. -
- e. From the reactor well, nanually guide the sling so that the four sockets (Figure 33, Section II) seat over the steam dryer lifting d(~m lugs.
- f. Move the control box control valve to the INSERT position to insert the four lifting' pins through the sockets and lifting lugs. Verify that the pins have inserted through the sockets.
CAUTIOR: EIvery tine the dryer-separator sling is used to lift the dryer assembly, the load distribution at the four lifting points should be checked to insure that the load is dis-tributed equally to the four turnbuckles on the dryer-separator sling. An unequal load could result in severe equipment damage and possible injury to personnel. l h
- W. ' .
III-13 9-24-74 Rev. 2
7 L . 2S g. Operate the crane to carefully raise the dryer assembly out of 'the L.) reactor vessel until the bottom edge of the dryer assembly skirt is in position to clear the curb of the dryer-separator canal.
' h.
Transport the dryer assembly to its storage area at the far end of the dryer-separator pool.
- i. Operate the crane to carefully lover the dryer assembly onto the
~
floor of the dryer-separator pool. Slachen the sling cables. WARIIING RADIATION HAZARD: The steam dryer assembly must be kept vet to prevent airborne contamination until such time as the dryer-separator pool is flooded.
) -
- j. Move the cor. trol box control valve to RETRACT. Check tht.: all four pins have retracted by verifying that all four pressure gauges indicate zero pressure. '
, k. Operate the crane to carefully lift the sling, and verify that the sling has disengaged from the dryer assembly lifting lugs.
NOTE: The shroud head and steam separator assembly is nora- lly removed following removal of the steam dryer assembly. In this event, disregard Steps 1 and m. Leave the dryer-separator sling suspended on the main crane hook until the i js steam separator assembly is removed. l b III-114 9-24-74 Rev. 2 l
. . . . _ ~ _
l
j 1. Operate the crane to transport the dryer-separator sling t5 its storage area on the operating floor. .
- m. Slacken the crane cable. Using the pin insertion tool, push the lock pins onto the pin supports onthe hook box to free the crane book.
I F. PLUG MAIN STEAM LINES For additional s details, refer to General Electric Instruction GEK-331013 l contain-d in DAEC Operation and Maintenance Manual, GEK-9692; Volu=e VI. l The steam line plug is used with the reactor building auxiliary hoist, a manually operated chain hoist (1/2 ton), the stes: line plug installation t erg ! \- i -s ; tool (See Figure 53, section II), and an actuating pole with an L-hoch l . I ' attach =ent. A line is required to lash the plug to a vessel stud after it
- has been installed.
I I To install the steam line plug, perform the following steps: l l
- 1. Place the hanger plate assenbly (air control panel) on the safety l
railing where it will not interfere with-other operations.
-2. Connect service air (100 psig) to the air control panel quick connect stem. Insure that the regulator and globe valve are closed.
i 1, iL) III-15 9-24-74
. Rev. 2 L
- - s
m , I l l. l
- 3. Connect 50-foot hose between the air control panel bottom connector and the connector on the line at the steam line plug vent pipe.
'k. Use the hand hoist to suspend the steam line plug installation tool from the hook of the auxiliary hoist.
~
- 5. Latch the stezn line plug in the installation tool. ;
- 6. Using the auxiliary hoist, position the steam line plug adjacent to the reactor vessel no::le. .
7 . While a man reaching over the studs is guiding the plug, lower it such that it slides along the vessel vall until it slips into the nochle.
- 8. Use the hand hoist to adjust elevation for vertical clearance of the plus in the no::le, and move the auxilia'ry. hoist horizontally to insert the plug farther into the no::le unt'il the 0-ring touches the reactor vessel vall.
9 Adjust the regulator at the air control panel for 30 pais.
- 10. Lash the handle of the ' vent pipe to the nearest stud with tie line.
- 11. Using an actuating pole with L-hook, release the plug from the installa-tion tool.
i l 9-24-74 ' III-16 Rev. 2 i 1
I 12. Using the auxiliary hoist, move the installation tool horisontal17 away fro = the plug and then raise it out of the reactor vessel. 13 Using the same procedure, install the retaining stea= line plugs.
- 14. Raise the reactor vessel water level up to the vessel flange.
15 Recove the vent cap on the vent pipe of the steam line plug.
- 16. Drain the stea line.
UCTE: The pressure differential between vessel and stea= line _, vill ec:plete the insertion of the plug and ccepress the 0-ring until the square face plate of the plug is approxi-tately 1/k inch from the vessel vall. 17 Using the regclator and globe velve at the 'a'ir control panel, bleed all air frc: the inflatable seal. The seal' vill reposition. e
- 18. At the air control panel, insure that the globe valve is closed, and adjust the air supply for 30 psig.
19 Tighten the locknut on the regulator ste: to insure that the regulator vill maintain 30 5 ps; during the outage. Do not remove s.ervice air l from the air control panel. l h III-17 9-24-74 Rev. 2
=N 4 m - --
,f' d 20. When steam lines have drained, replace the vent caps on the vent pipes of the stea::2 line plugs. 21. Tie the hoses down so that they will stay out of the way during refuel-ing operations and when reactor well is flooded. 4 C h ! i l l l 1 l l l e 0 III-18 9-24-74 Rev. 2
e-G. ~ DELETED . H. REMOVE STE.cf SIDARATOR '
- 1. Prerequisites a.
The RP7 head cust be removed and stored on the refueling floor. b. The dryer-separator pool plugs must be removed from between the [ reactor well and the dryer-separator storage pool and stored on i i the refueling floor. - e c. The steam dryer assembly must be removed and stored in the dryer aeparator pool. . I i s d. The fuel pool gates must be in place and the fuel pool shield plugs . removed and stored in the designated areas of the refueling floor. III-19 9-24-74 I Rev. 2 I h -- - -
(3 WARNIUG RADIATION HAZARD: Fuel movement in the fuel storage pool V near the fuel pool gates must be suspended while water in the reactor well is lowered to the RPV flange level, and work is in progress. The fuel pool gates have no shielding to prevent radio-active exposure of personnel in the reactor vell.
- 2. Special Equipment Required ,
- a. Dryer-Separator sling
- b. Pin insertion tool (part of dryer-separator sling, above)
- c. Shroud Head Bolt Urench .
- d. Service Platform (if required)
(:) 3 Steam Separator Re= oval Re= oval of the steam separator assembly consists of unlockin5 the shroud head hold-down bolts, flooding the reactor well and dryer-separator pool, and physical re= oval of the 'asse=bly. Proceed as follows: NOTE: If conditions permit, loosen the shroud head hold down bolts operating from the vessel flange without the use of the service . platform to permit the dryer-separator sling to remain attached to the reactor building crane.
- a. Install service platfor= (if required) onto the service platform
() support using the reactor building crane and the service platform sling. . III-20 9-24-74 Rev. 2
NOTE: Four personnel, each with a shroud head bolt vrench, are re-quired on the'. service platform to perform the following step:
- b. Using the shroud head bolt vrench, loosen the unlock each of the '
shroud head hold-down bolts as follows: (1) Slip the vrench socket over the end of the hold-down bolt. (2) Using the vrench handle, push downwa-d to' release the nut re-tainer. Maintain downward force and loosen the nut, and back it off until it contacts 'the stop. (3) Using the locator handle, engage the locator socket on the flat on the end of the holddown bolt.
- c. Recove the service platform (if used) and place it on the operating floor using the crane and service platform sling.
NOTE: During the following step, the pneumatic control box must be held while the sling is transported.
- d. Perform Step a of Section E.3, above, to attach the Reactor Building cain cr'ane hook to_the dryer-separator slin6 (if required).
- e. Perform Steps b through f of Section E.3 to transport the sling to the reactor (if required).
,III-21 9-24-74 '
Rev. 2 l x I i
_, f. Test operate the dryer-separator sling before taking any co.'nection to the asse=bly.
- g. Fro = the reactor well, manually guide the sling so that the sockets seat over the shroud head lifting lugs. -
- h. Move the sling control box control valve to the INSERT position to insert the four lifting pins through the sockets and lifting lugs.
Verify that the pins have inserted through the sockets by observing line pressure on the four control box pressure gaugts.
- i. Raise the assenbly sufficiently to verify free movement.
- j. Flcod the reactor vell and dryer-separator pool to the level of the fue? storage pool.
NCTE: The following step may be connenced when water has reached a point approximately 8 feet above the curb of the dryer-
, separator pool. ,
- k. Operate the crane to ccrefully raise the shroud head and steam separator assembly out of the reactor vessel until the bottom edge of the shroud head is in position to clear the curb of the dryer-separator canal.
9-24-74 ~ III-22 -' Rev. 2
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1. Transport the separator assembly to its storage area in the dryer-separator storage pit. m. Operate the crane to carefully lover the steam separator assembly onto the floor of the dryer-separator storage pit. Slacken the sling cables. n. Move the control box control valve to RETRACT to disconnect the assembly from the dryer-separator sling, check that the pressure gauges indicate zero pressure and that all four engagement pins are retracted. o. Operate the crane to carefully lift the sling, and verify that the sling han disengaged frc= the separator assembly lifting It:gs.
- p. Operate the crane to transport the dryer-separator sling to its s:crage crea on the operating floor.
- q. 31achen the crane cable. Using the pin insertion tool, push the lock pins onto the pin support on the hook box to free the crane hook.
III-22a 9-24-74 Rev. 2 y y Kjgg-;; .~~ ' -~u,,------
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- I. RD!OVE FUEL POOL GATES G
The fuel pool gates are designed to be held in place by their own weight. The hangers counted on the pool valls are beveled such that the weight of the gate forces it closer to the fuel pool vall, compressing the gate gasket. In addition, the water pressure on the pool side (with the reactor well drained) further compresses those gaskets. Also, two bolts on the top of each gate assist in compressing the gasket. The gates are removed by the following steps. Refer to Figure 59, Section II. l' . Flood the reactor well to equalize the pressure across the gates.
- 2. Connect slings frem the two lugs on the top of the south gate to the reacter building crane; raise the crane to recove slack cable.
/ \_] .
- 3. Loosen the belts for that gate.
- h. Lift the gate until it clears the support lugs. 11ove it to the storage hangers for that gate on the vest fuel pool vall and set the gate in place. ,
5 Replace steps 2 through h for the north fuel pool gate. J. INSERVICE It!SPECTIO: Table k.6.1 of the Technical Specifications outlines the basic inservice inspection requirements . A more detailed schedule for the various aspects
', of the continu'ing inservice inspection program vill be prepared at a la;.er date.
III-23 9-24-74 Rev. 2 "yM m -- E 'y g- ME"."' W,3- b F% W" , V ;'R ' M "
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K. - COlffROL ROD AND NUCLEAR INSTRUMENTATION OPERATION DURING REFUELITG r j
. During refwling, the reactivity of the core is being altered. 'Certain
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Id interlocks and refueling procedures assure that inadvutent criticality does not occur. When the mode switch is in the REFUEL position, as
- required b;- the Technical Specifications, interlocks prevent the Refueling Platform from being moved over the core if a control rod is vitlidrawn and fuel is on a hoist. Also, if the refueling platform is over the core with fuel on a hoist, control rod motion'is blocked by the interlocks. With the mode switch in the REFUEL position, only one control rod can be withdrawn.
The Source Range Monitors (SP24s) are provided to monitor the core during periods of shutdown and to guide the operator during refueling operations and startup. By requiring two operable SRMs, one in and one adjacent to any core quad ant inere fuel or control rods are being =oved, the Technical O Specificatiens assure adequate monitoring of that quadrant during alterations. The Technical Specifications require a mini =u= response of 3 counts per l second on the operable SP24 channels, to assure that neutron flux is being i monitored.
' Normally during initial fueling, four boron-10, moveable Fuel' Loading
(" dunker")~Cha=ters (FLC) vill be connected to the SFl4 channels to enhance lov level neutron monitoring close-in to the partially loaded core. III-24 1-21-Th Rev. 1
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) Deleted L. REPLACE FUEL POOL GATES
- 1. ~ Connect slings from the two lugs on the top of the north gate to the Reactor Building crane.
- 2. Lift the gate clear of the storage hangers and set' in place. Tig~aten the holddown bolts for the gate.
- 3. Repeat Steps 1 and 2 for the south gate.
.O h. Drain the reacter vell and verify leak tightness of the gate gaskets, d
M. REPIJ.CE STE.O' SE?ARATOR 1.' With all. preli=inary operations ccmpleted, and with the reactor well and dryer-separator pool flooded to the level of the fuel storage. pool,
.e .
proceed as follove to install the steam separator assembly,
- a. Perfom Steps a(1) through a(h) of Section E.3 to attach the Reactor Building; main crane hook to the dryer-se'parator sling.
i 9-24-74 V III-25 Rev. 2 l
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n , (,) h. Perform Steps b through d of Section E.4 to transport the sling to the dryer-separator pool.
.b.1 Align the four sockets on the sling with the lifting eyes of the shroud head and separator assembly. ,
t
- c. Operate the crane to lover the sling down .into the dryer-separator
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pool and guide the sling so that the four sockets seat over the separator assembly lifting lugs.
- d. Move the sling control box control valve to the INSERT position to insert the four lifting pins through the sockets and lifting lugs.
Check that all four pressure gauSes indicate line pressure and that
- all four pins are properly engaged.
d.1 Verify that the T-bar is positioned correctly.
- e. Operate the crane to raise the separator asseibly approxicately 6
-feet off the floor of the storage pit ficor.
- f. Transport the. separator assembly through the dryer-separator canal, and center it over the reactor vessel. -
- g. Operate th>:. crane to carefully lover the separator assemb,1y, and manually rotate the sling as required to align the two slotted pads on the assenbly with the two shroud head guide rods in the reactor
(~} n III-26 l 9-24-74 Rev. 2 l
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vessel. h. With the guide rods captured by the two slotted pads, operate the crane to carefully lover the separator assembly into the reactor vessel until the shroud head is properly seated on the upper shroud. The sligrment pins on the assembly engage the shroud during the last few inches of the travel. i. Move the sling control box control valve to the RETRACT position.
- j. Operate the crane to carefully lift the sling, and verify that it Eaise the has disengaged from the separator assembly lifting lugs.
sling out cf the reactor vessel. UC/"R: Tne steam dryer assembly is normally installed following In this event, installation of the separator assembly. disregard Step k. Leave the dryer-separator sling sus-pended on the main crane until the steam dryer assembly is installed. e k. Perform Steps 1 and m of Sect. ion E.3.to store the dryer-separator sling and disengage it from Ehe crane hook. . k.1 Install the fuel pool gates to isolate the fue? storage pool. III-27 9-24-74 Rev. 2
o
- 1. Drain the reactor well and dryer-separator pool to the level of the
( }) vessel refueling bellows. Using decontamination equipment, thoroughly hose down and decontaminate the valls of the reactor well as required to permit personnel access. . NOTE: If conditions permit, tighten the shroud head hold down bolts operating from the vessel flange without the use of the service platfor=. . 1.1 Install the service platfors (if required) onto the service platforn support using the reactor building auxiliary crane and service platform sling. l (<;}' NOTE: Four personnel, each with a shroud head bolt vrench, are ) l required on the service platform for the following step. i
- m. Using the shroud head bolt vrench, loch .and tighten each of the shroud head hold-down bolts as follows:-
e (1) Slip the vrench socket over the end of the hold-down bolt. , l I (2) Usin's the locator handle, engage the locator cocket onto the flat on the end of the hold-down bolt. (3) Apply downward force and turn the locator handle 90' degrees l clockwise so that the flat is in position to lock the teebar III-28 9-24-74
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. hroud.
at the bottom of the hold-down bolt to the upper s d on Insert a torque vrench into the 0.52 inch diameter hol (la) dle is the outer vrench block so that the torque vrench han parallel with the head bolt vrench handle. d Maintain downward force to keep she nut retainer disengage , (5) hten the nut at the top of and using the torque vrench, tf S hold-down bolt to 50 foot-pounds torque. leted, n. When all vork requiring the service platform has been comp i platform sling f use the reactor building auxiliary crane and serv ce the refueling floor. to remove the service platform, and store it en N_ . DELETED i e 9-24-74 III-29 Rev. 2 w ,a u.a.:.a.a,w
> 0. UNPLUG MAIN STEAM LINES To remove the steam line plugs frem the reactor vessel nostles, perfom I the following steps:
- 1. Lower the reactor vessel vater level to the vessel flange.
9 CAUTION: Do not use air pressure in the steam lines to remove the plugs. This will not work and can cause accidents. CAUTION: All four vent caps must be' removed when filling steam lines with vater. Since all four ateam lines are inter-connected, the rising vater and entrapped air at a capped vent pipe vill blow that plug out of the nozzle.
)
- 2. Remove the vent caps frem the vent pipes of the steam line plugs.
3 Using the air control panels, vent the air from the inflatable seals.
- b. Fill the stecs lines with water by raising the water level in the reactor vessel until the water flows into the vent pipes. If the particular plant has other means of filling the steam lines with vater, th'ose means should be utilised to save time.
NOTE: When the pressures in the reactor vessel and in the steam lines are equalized, the plugs vill be free to cove. III-30 9-2.'e -7 's Rev. 2
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,q Using the hand hoist for elevation adjustments, rencve the plugs in A/ 5
.the same manner in which they were installed. Transport them to a decontamination area where they can be cleaned and dried. .
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w t~ WARNING - RADIATION HAZARD: The equipment described in these i instructions is subject to radioactive contamination in varying degrees, depend'ing upon the particular application of the equip-ment. It.is assumed that radiation monitoring and protective measures established at the power station 4117 be strictly
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observed to avoid personnel conta=ination durin6 operation and maintenance of the equipment described herein. 9 F. Disconnect service air from the air control panels and stow the panels and hoses. e a' e e e 9 ~ III-31 9-24-74
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TIIIS PAGE DELEIED ] i I s III-32 9-24-74 Rev. 2 e e
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l l l 1 1 1 l 1 l l l q l l 1 i e O e 1s ' 9 III-33 9-24-74 Rev. 2 1 1 1 GO OO * ( -- .. -- -... _ .._
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l P. REPLACE STEMI DRYER ASSELSLY a . In the following instruct' ions, it is assumed that all' operations preli=inary to installation of the steam dryer (stea= separator and shroud head assembly installation, etc. ) have been co=pleted. With all such operations cc pleted, proceed as follows to install the steam dryer asse=bly.
- 1. Perfors Steps a(1) through a(h) of Section E.3, above, to attach the Reactor Building main crane hook to the dryer-separator sling-HOTE: The dryer-separator pit and reactor well should be drained prior to performing this instruction.
- 2. With cne technician on the refueling platfern holding the sling control t
'/ box, use the crane to transport the sling over the dryer assembly in the dryer-separator pool.
' 2a. Test operate the dryer-separator sling before =aking any connection to the dryer.
e 3 Verify that the control box control valve is in the REIRACT position i l I and that the four lifting pins on the sling are retracted out of the s oc kP' s . .
- h. Operate the crane to lover the sling down into the dryer-separator pit and canually guide the sling so that the four sockets seat over
~s the stemm dryer lifting lugs.
(J L-l l
,III-34 9-24-74 Rev. 2 0
{} 5 Move the control box control valve to the INSERT position to insert the four lifting pins through the sockets and lifting lugs. l Sa. Verify that the pins have inserted through the sockets. l l l 6. Operate the crane to raise the dryer assembly approximately 6 feet l off the floor of the dryer-separator pit. 7 Transport the dryer assembly through the dryer-separator canal and center it over the reactor well.
- 8. Lover the dryer assembly until the lover edge of the dryer skirt is in line with the RPV flange.
,O 'O 9 Manually align the dryer assembly so that the sockets on the dryer-l separator sling are aligned with the lifting lugs of the dhroud head I
guide rods in the reactor vessel. Continue lowering the dryer assembly l - ! into place in'the reactor. , i ,e 1 4
- 10. Hove the sling control box control valve to the RETRACT position. l l
Verify that +,he pins have retracted through the sockets. l l
- 11. Operate the crane to carefully lift the sling, and verify that the sling l has disengsged from the dryer assembly lifting lugs.
L I 3 (D . III-35 9-24-74 Rev. 2
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.ee
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' 1 Perform Steps 1 and n of Para 5raph E.3, above, to store the sling and
( ll 12. k { disengage it from the'erane hook. ! t l Q REPLACE REACTOR VESSEL HEAD In the instructions that follow, it is assumed that the reactor well and dryer-separator storage pit are drained, hosed down, and thoroughly decon-taminated, dryer installation ec=pleted, service platform support removed, With all such preliminary ; vessel head 0-ring installation co=pleted. For operations co=pleted, proceed as follows to install the vessel head. more details constit General Electric =anual titled: Operation and Maintenance Instructions - Reacter Assenbly - GEK 166h0.
- 1. In the reactor vell, replace the studs removed in Section D.3, Step C as folicas:
- a. Using the Reactor Building auxiliary crane, transport the head stud
~ rack with the studs to the reactor vell adjacent to the refueling cana1.
e
- b. Verify that the bushings are in place in the enpty stud holes in the vessel flange.
c. Verify that the studs and stud holes are thoroughly clean, col Lubricate the stud and stud hold threads with an approved thread m compound. III-36 9-24-74 Rev. 2
a With the threaded plugs recoved from the studs, use the Reactor h d. Building auxiliary crane and the head stud handling tool to lift each stud out of the rack, and carefully seat it into the corres-Pondingly nu=bered vessel flange hole. NOTE: DELETED
- e. Using the stud-bolt vrench, thread each stud into place. Tighten in accordance with the reactor pressure vessel manufacturer's instruc-tions.
- f. Install stud protectors on the studs.
O g. Using the Reactor Building auxiliary hoist, remove the ecpty head stud rack to the operating floor,
- h. D" ZED
- 2. DELETED 3 Perfor= Step f(1) through f(h) of Section D.3 to attach the Reactor Building main crane hook to the head strongback.
i
- h. Perform Steps g and h of Section D.3 to prepare the head strongback for vessel. head lifting.
J 9-24-74 III-3T Rev. 2
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() 5 Using the main Reactor Building crane, . lift the head strongback and position it over the vessel head, stored on the operating floor.
- 6. Manually guide the strongback lifting arms over the four 1ugs on the ,
. . vessel head.
- T. With the lifting arms properly positioned, assemble the four turnbuckle assemblies to the four shackles on the vessel head lugs. -
CAUTICU: Evary time the vessel head is lifted, the load distribution at the floor lifting points should be checked to insure that the load is distributed equally to the four turnbuckles on the strongback. An unequal load could result in severe 0 equipment damage and possible injury to personnel.
- 8. Operate the crane as required to lift the vessel head off the head holding pedestal.
' NOTE: At this point, the vessel head should be thoroughly cleaned and inspected. The flange seal should also be closely in-spected for integrity.
9 Operate tr.e Reactor Building crane to transport the vessel head over the~ - reactor vessel until the head is positioned approximately 3, feet over the head alignment sleeves. III-30 9-24-74 Rev. 2
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- 10. Manually guide the head as required to align the stud holes over the
(] correspondingly numbered studs. Operate the crane to carefully lower the head to within 12 inches of the vessel flange, checking that the holes are properly centered over the head align =ent sleeves. i 1 9 s . 1 1 !O - i i I i
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2 s 1
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0 9-24-74 III-39 l . . Rev. 2
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Before performing Step 11, verify that the vessel flange'is l CAUTION: i thoroughly clean and free of foreign matter, and that no material has sheared off the head alignment sleeves. Foreign matter on the vessel flange would prevent an effective seal [ and result in damage to equipment.
- 11. Carefully lover the head onto the vessel flange until it seats.
l
- 12. With the vessel head in place, perform Steps p through s of Section D.3 \
to remove the head strongback and. store it on the operating floor. f l 12a. Using the ?.eactor Building auxiliary crane, transport the head nut and vasher racks, with the head nuts and washers, to the reactor vell.
~
l NOTI: Check the serial numbers of the nuts and vashers in the in- l
)
dividual racks. Locate the racks adjacent to the correspond-ingly numbered flange holes and studs. 12b. Lubricate the nut threads and all bearing surfaces of the nuts and washers with an approved thread compound. 13 Remove the stud protectors from each stud and place the special vasher , I l with the convex side up over the correspondingly numbered stud. III ho 9-24-74 Rev. 2 l l m -
eg CAUTION: After re=oving the stud thread protectors, verify that the studs are thoroughly clean of foreign =aterial and insure that no shavings fall down into the flange area. Similarly, nahe certain the vashers and nuts are thor-oughly clean prior to installation.
- 14. Using the nut handling tool, install each nut on its correspondingly numbered stud. -
15 Using the nut vrench, turn each nut until it is snug against the vashers. NOTE: Do not turn the nut behond the snug condition causing binding en the vasher. s
- 16. Using the Reacter Building auxiliary crane, transport the head nut and
~
vasher racks to the storage area on the refueling floor. l l 17 Remove the threaded plug frca the top of each stud. l l l
- 18. Insert a stud elongation ceasuring rod into each stud, and in sequence perform stud tensioning in accordance with the manufacturer's instructions.
NOTE: Upon completion of stud tensioning, remove the rods from the studs and install the threaded plugs renoved in Step 17 III L0a 9-24-74 Rev. 2 . e a--~~--,.. e_ - _ _ . _ _
.( R .' REPLACE DRYWELL HEAD
- 1. As disetJsed in Section D, attach the Reactor Building main crane hook to the dryvell head reactor vessel head strongback. ,
l I
- 2. At each of the four lir ing s arms on the strongback, meve the dry-ell l head turnbuckle assembly from the stowed position to the lift position. l i
- 3. Remove the dryvell flange protectors. ,
)
i 4. CompletethefinalinspectionoftNedryvellpriortocloseup. 5 Using the Reacter Building crane with the strongback, lift and transport the dryvell head and set in. place on the flange.
- 6. Replace the 102 bolts and torque.
7 Perfer= the dryvell' leak tightness test. , ; l t S. REPLACESHIELD$ LOCKS The shield blocks are replaced in the following order: ,
- 1. Fuel pool canal blocks (b)
- 2. Separator / dryer pool blocks (3) -
i 3 Lover vessel vell plugs ('2) - I i
.%-) .
III-bl 9-24-74 Rev. 2 1 l
- 4. Middle vessel vell plugs (2) 5 Upper vessel vell plugs (2) 4 Y
e 4 0 . S. . III-42 ___ _}}