ML19224B041

Maint Procedure 2401-6.1:reactor Internals Vent Valve Removal &/Or Replacement

ML19224B041
Person / Time
Site:	Crane
Issue date:	02/06/1976
From:	Metropolitan Edison Co
To:	Mullinix W NRC/IE
References
2401-6.1, TM-0057, TM-57, NUDOCS 7906130463
Download: ML19224B041 (12)

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IMI DOCUMENTS DOCUMENT NO:

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METROPOLITAN EDISON COMPAfri.

Wilda R. Mullinix, NRC 7906130%s gg40%

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2401-6.1 AFR 2 3 579 _

THREE MILE ISLAND NUCLEAR STATION UNIT f 2 MAI!!TE!!A :CE PRCCECURE 2401-6.1

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REACTOR IllTER?lALS VENT VALVE REMOVAL At;D/0R REPLACE.'iENT Table of Effective Pags Pace Date Revision Pace Date R evision Pace Date Revision 1.0 02/C6/75 0

26.0 51.0 2.0 02/C5/76 0

27.0 52.0 3.0 02/06/75 0

28.0 53.0 4.0 02/06/76 0

29.0 54.0 5.0 02/C6/76 0

30.0 55.0 6.0 02/C5/76 0

31.0 56.0 7.0 02/CG/75 0

32.0 57.0 8.0 02/C6/75 0

33.0 58.0 9.0 02/C6/76 0

34.0 59.0 10.0 C2/CE/76 0

35.0 60.0 11.0 02/CS/76 0

36.0 61.0 12.0 37.0 62.0 13.0 33.0 63.0 14.0 39.0 64.0 15.0 40.0 65.0 16.0 41.0 66.0 17.0 42.0 67.0 18.0 43.0 68.0 19.0 44.0 69.0 20.0 45.0 70.0 21.0 46.0 71.0 22.C 47.0 72.0 23.0 48.0 73.0 24.0 49.0 74.0 25.0 50.0 75.0 Unit 1 Staf' Recommencs Apprcval Unit 2 Staff Recommends Approval Approval b

Date Approval

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D ate Ccgnizant Dept. Head Ccgnizant De;t. Head Unit 1 PORC Recommends Approval Unit PORC Recommends Approval N$

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Chairman of PC RC wc-Chairman of P0RC

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PORC ccmments cf included PORC ccmments of inciuded (date)

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Revision 0 02/06/76 THREE MILE ISLAND NUCLEAR STATION UNIT #2 MAINTENANCE PRCCECUP,E 2401-6.1 Reactor Internals Vent Valve Removal and/or Replacement 1.0 PURPOSE t

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..r tablish and define conditions, preparations, ai.d maintenance r.~cc Jure for the removal and/or replacement cf reactor internal vent valves.

2.0 DESCRIPTION

2.1 Atwcci and Morrill Company, Salen, Massachusetts la" Internal Vent Valve.

2.2 Free swinging gravity closing ty;e check valve.

2.3 Cesign Conditions.'

Pressure 600 PSIG 0

Temperatur? 650 F.

2.4 Approximate gross weight 1450 lbs.

D 2.5 Dimensions 24" x 5".

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3.0 REFERENCES

3.1 Instruction Manuals.

3.1.1 Instruction Manual, la" internal Vent Valve by 2:wced & Marrill Company No. 620-0C05 - B&R Spec. 7.CO.

3.1.2 Reactor Vessel Instruction Manual Nc. 01-C205-00 B&R Spec.

7.00.

3.2 Drawings 3.2.1 20762-H Atwood 5 Morrill Campany - Internal Vent Valve.

3&R 7.00 2313.

3.2.2 2012292 B&W Vent Valve Handling Tcci, GAI EM RA.

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1.0 184 038

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2401-6.1 Revision 0 I

02/06/76 3.3 Operating Procedures Blanketing of Reactor Coolant.

3.3.1 2103-1.6 Draining and N2 3.4 TMI Nuclear Station Radiation Protection Manual AP 1C03.

3.5 Rules for the Protection of Men Working on Mechanical and Electrical Apparatus AP 1002.

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4.0 PLANT STATUS AND/CR PREREOUISITE CONDITIONS 31 nketing of 4.1 Plant conditions as per 2103-1.6 Draining and N2 Reactor Coolant Systen.

4.2 Internals indexing fixture in place on ' Reactor 'lessel Flange.

Plenum Assembly removed and stored in internals stcrace stand 4.3 Tempcrary platform installed cn internals indexine fixture 4.4 Refueling. canal water level shall be ber.veen 2 to 6 inches beicw underside of temporary handling platform, unless radiation levels permit a icwer level.

5.0 LIMITS AND/CR PRECAUT!CNS 5.1 Insure Radiation work permit is initiated per Ref. 3.5 two high portable range icn chamber radiation monitors to be in operation at all times.

5.2 Initiate tools, equipment and materials check in, check out CAUTICN: The maintenance of Reacter Internal Vent Valve is hazardcus both to workmen and internals of reactor vessel.

Extreme care and caution must be exercised at all times.

5.3 Curing vent valve handlir.g cperations, refuelinq canal water level shall be maintained at least 2 and r.o greater than 5 inches celow under side of access platfccm.

6.0 SPECIAL TCCLS. MATERIALS AND/CR CUALIFICAT!CNS 5.1 Tcols 2.0 184 039

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02/06/76 One 1 ton chain fall as an intermediate link to hold the 6.1.1 Cearse roverents internal vent valve tool during fine movenents.

to be performed by the polar crane.

1.0-1000 R/hr.

6.1.2 Two portable high range icn chambers a

6.1.3 Portable Submarine lighting system.

1 6.1.4 One vent valve handling tool.

6.1. 6 One 1 ton nylon sling x 5 f t.

6.2 Qualifications Three workmen required to operate vent valve handlinn tool, 6.2.1 and must have been appropriately instructed in the operation of this tool.

7.0 PROCETURE_

Initial conditions - valve installation.

l.1 Internal indexing fixture in place en reactcr vessel flanne.

7.1.1 Plenum assembly removed and stored in internals storage stand.

Access platform installed on internals indexing fixture 7.1.2 Refueling canal water level shall be between 2 to 6 inches 7.1.3 belcw underside of access platform, unless radiation levels permit a lcwer level.

One ton chain bicck is co provide small increr.ents NOTE:

of movements by workmen on access platforn.

Attach tool to valve by er.gacing bcdy dowels with upper jaws of 7.2 Use caliper to measure span of talve retaining eines, tools.

adjusting rings, if necessary to cbtain ecual span.

Turn handwheel tight tc clamo tac 1 to valve.

7.3 001 to auxi'iary hock on the Polar 7.4 Attach vent valve handling crane using a pick-up shackle and One ton chain block.

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.k that valve hangs with f ace plumb or with tcp slightly tipped 7.5 Cht away from opening in the core support shield. Adjust pickup shackle Move valve to reactor and icwcr to approximate position.

if required.

Move valve towards its seat using hand grip on tool to position.

7.6 Ho'd jaws of too' parallel to face of mounting ring and align 1

As valve seats center cf tool with marked center of mounting ring.

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in place the contact will " telegraph" through t e tool to the operatcr.

Operator should check that. valve is squarely seated by rockina valve vertically with the handgrip on the tcol.

Turn both wrenches to "cn" position and operate tool to ennace

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Operator cust ;se Cautien to hold tcol retaining rings jackscrews.

steady (with handgrip abscrbing wrenching reacticns).,hile retaining rings are entering their slots.

A sudden increase in torque will indicate that rinos are C?UTIC'i:

not entering the =cunting cir.g and jackscrews must be

" backed-off" and positioning rechecked.

Use dials en CAUTICN: Synchronize wrenches by pinning linkage.

wrenches tc aid in insuring that screws are synchrcnized to prevent binding and seizing.

Continue operating wrenches until appreciable torcue (50-75 #:

7.3 Check pcsiticn of retaininc ring usino lbs.) is required to turn.

submarine light and cbserving frcn oppcsite side of workino platform-Ccatinue wrenchina until inngs should appear to ce nearly seated.

audible click signal indicates one jackscrew (or both) nave reached their present torque cf 110 f t.

lbs.

Check pcsition tc verify that retaining r'ngs are in place.

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g 2401-6.1 42 8 I Revision 0 02/06/76 7.9 Remove pin frca wrench linkage and check torque on jackscrews individually.

7.10 Back-off handwheel two full turns.

(This pernits shroud to raise and expose valve splines to pressure plate).

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7.11 Use chain hoist to raise tool to stcp.

(This lifts shroud but j

leaves socket engaged).

0 7.12 Turn jackscrew slightly (no more than 30 ) with wrench position on An increase in torque will indicate that soline has entered

."0FF".

slot in the pressure plate.

Reverse wrench and tighten slinhtly.

Repeat this operation (alternately icosening and tigntenina several times to insure that key has seated).

Repeat for second jachscrew CAUTICN:

Do not exceed 120 f t. Ibs. Of :crcue in either d'rection Due to lipMt 7.13 Release wrench by backing cff hand; heel to stc;.

weight of tool and cicse fits en valve tne wheel may rise on the A slight movement of the toci or a bicw cn the end of the stea.

shaft will free the tool.

7.14 Using chainfall raise toci until tool wrench sockets clear valve-Tool can new be manually moved clear of valve and j ackscrews.

hoisted.

RE!!CVAL 7.15 Position indexing fixture and a working platfern over apen reactor.

7.16 Attach vent valve handling tool to auxiliary Scok on Poler Crane.

Tcol jaws should be fully coen.

7.17 ilorking fron platform, icwer the tcci until the ends of the sccket are just abcVe the top of the jacsacrews with the tcol clearina the valve.

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7.18 Move tool towards the valve until sockets are directly above the jackscrews. Wrench linkage should be released by removing pin to permit sockets to " find" their position while lowering.

7.19 Using a chainfall lower tool over sockets, (using handgrip to guide s

tool) until slack beccmes evident in rigging or dial registers loss i

of load.

Should tool come to rest at an intermediate point it will indicate that sockets have not properly aligned. Wrenches should be moved slightly to bring scckets into engagement with hex on jackscrews.

7.20 Lcwar tool to rest.

Note that u;per jaws will engage dowels in

' valve as tcol is lowered to engage sockets.

7.21 Turn handwheel tight to clamp tool to valve.

7.22 Take all slack cut of rigging using chainfall.

7.23 Synchronice wrenches by pinning linkace.

Turn on-off selectors on wrencres as required to permit free movement.

(Do not turn jackscrews).

Turn selectors to "off" cn both wrenches.

CAUTICN:

Use dial on tool wrenches to aid in keeping jackscrews synchroniced.

7.24 Using center handle te operate wrenches and handgrip on tcol to take reaction, the jackscrews can be fully released.

7.25 '<,' hen jackscrews are fully released, valve can be moved away from its seat usinc main fuel crane and manually guiding valve with handgrip cn tool.

7.26 Y.ove valve clear of internals and hoist clear.

CAUTION:

Mclitcr radiaticn levels as valve is raised.

If appreciable increase as deterair.ud by H.P. persenr.el is noted personnel shCJld be evacuated from Working platform and valve m '

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2401-6.1 Revision 0 02/06/76 be raised and stored with H.P. providing conitorina of the valve.

8.0 POST REPAIR ACTIVITIES 8.1 Exercisc valve manually to insure proper operaticn.

I' 8.2 Temporary platfora removed, cleaned and stored.

8.3 Internal indexing fixture removed, cleaned and stored.

8.4 Handling tcols recoved, cleaned, and stcred.

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