ML19350C183

Hydraulic Snubber Surveillance & Maint Program.

ML19350C183
Person / Time
Site:	Point Beach
Issue date:	05/05/1977
From:	WISCONSIN ELECTRIC POWER CO.
To:
Shared Package
ML19350C182	List: ML19350C180 ML19350C183 ML19350C186
References
PT-R-2, TAC-10142, TAC-10143, TAC-11300, TAC-11321, NUDOCS 8103310475
Download: ML19350C183 (7)

Text

.-_,.,

,PT R-2

t.A.;en- he* - j- A Revision 2 05-05-77 HYDRAULIC SNUJBER SURVEILLANCE AND MAINTENANCE PROGRAM 1.0 . PURPOSE The purpose of this procedure is to establish a consistant guideline for periodic inspection, rebuilding and functional testing of the

.. safety related hydraulic snubbers in accordance with the Technical Specifications section 15.4.13. L

2.0 REFERENCES

2.1 Technical Specifications Section 1L 3.13 and 15.4.13 2.2 Anker-Holth Technical Instruction Manual for Hydraulic Shock Suppressors (12.12620.007 furnished to Bechtel Corporation.

(Bechtel Order #6118-C27-AC, Anker-Holth Order #77-37149) 2.3 Grinnell Catal*og PH-74

• i 2.4 ~ PT R-3, Safety Related Hydraulic Snubber -Inspections for

(.. Units:1 and 2 J.0 SPECIAL EQUIPMENT (ANKER-HOLTH SNUBBERS)

- 3.1 - = Gather the necessa'ry special tools made for disassecbly and maintenance of snubbers.

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'3.1.1 Piston spanner wrench (Anker-Holth only) 3.1.2 Cylinder . clamp . (Anker-Holth only) 3.1.3' Snubber control block bypass rig 3.1.4l Control block fill line (Anker-Holth only) 3.1.5 Enerpac rams 3.1.6 Miscellaneous hand teols as required 3.2 psyra spare parts avail'able and necessary oil (Vess*tebe dfb bbh General Electric for Anker-Holth and Grinnell #SF-1154GE

- hydraulic shock and sway s1.ppressor fluid for the Grinnell-

. snubbers).

3.2.1L __800K snubbers requirc approximately five gallons.

28,10 881'0475 ,

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PT R-2 Page 2 3.2.2 500K snubbers require approximately three gallons.

3.2.3 Grinnell snubbers require approximately one gallen.

4.0 PREREQUISITES 4.1 Determine which snubber is to be disassembled and inspected.

i 4.1.1 At each refueling one Anker-Holth and two Crinnell are to be completely disasserbled and refurbished. A dif-ferent snubber will be done each time (unless PT R-3 inspection dictates otherwise) in an effort to do all snubbers within a given time span (10 years for Anker-Holth and six years for Grinnell) which represents less -than ona-quarter of design life.

4 .1. 2 . Perform hydraulic snubber inspection as per PT R-3

. to determine if any snubbers are leaking.

NOTE: IF ANY SNUB 3ERS ARE SUSPECTED OF BEING INCPERATIVE, (EMPTY RESERVOIR, IIAKING SEALS, ETC.) NOTIFY THE MAINTENANCE'SUPERINTENCENT, WHO WILL'CCNSULT THE TECHNICAL SPECIFICATICNS TO DETERMINE WHICH

[ SNUBBERS ARE TO'BE REPAIRED. IF A SNUBBER IS

.4 " SUSPECTED OF BEING IMOPERATIVE IT MUST BE TESTED PRIOR TO DISASSEMBLY FOR REPAIR.

NOTE: THIS PROCEDUPS IS WRI? FEN WITH DIP 2CT APPLICATION TO THE ANKER-HOLTH SNUBBERS, BUT THE GRINNEL SUUBBERS'ARE DCNE BASICALLY-

'THE SAME WAY, 'EXCEPT THAT SINCE THEY HAVE THEIR CN'T RESERVOIRS A SIMULATED RESERVOIR IS NOT SECESSARY.

5.'O PROCEDURE

,2 5.l' Remove s ubber from system.

l5.1.1. Measure .and record piston extension.

5 '. l . 2 . Remove reservoir line from control block. _Immediately rinstall- swagelock cap's to prevent loss of _ oil - (Anker-

_Holth only).

5.1.31 Install' control block bypass to -enable relatively .

- free motion -of snubber piston. (Anker-Holth caly) 5.l'.4 - iRemove snubber and takerit to. the shop for rebuiiding f and testing. :

CAUTION: DO'NOT IDISASSEMBLE CONTROL BLCCK OR MOVE PRESSURE'AD-

' JUSTING ' SCREWS '- ~ THESE ARE FACTORY SET.

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• - . PT R-2 Page 3 NOTE: PRIOR TO DISASSEMBLY OF A SNUBBER, CHECK WIT!! THE MAINTENANCE SUPERVISOR TO UETEPJiINE IF THE SNUBBER REQUIRES A PP2-DIS-ASSEMBLY FUNCTICNAL TEST.

5.2 Disasserbiv, 5.2.1 . Follow asserbly instruction in reverse. Save all "O" rings and seals for inspection by a Maintenance Supervisor.

5.2.2 The cylinder clamp will have to be used with hydrau12.c jacks to remove cylinder from the heads (Imker-Holth only).

5 .'2 . 3 Clean all parts throughly with acetone.

CAUTION: BE EXTREMELY CAREFUL NOT TO SCRATCH CR DAMAGE ANY POLISHED SURFACE WHEP2 0-RINGS MUST SEAL. USE NO ABRASIVES CN SEALING SURFACES.

5.3 Assembly

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5.3.1 General asserbly instructions ,

~a. - All components -shall be throghly degreased and *

'- . cleaned before asserbly.

'b. Lubricate all 0-rings and backup rings 'with snubber oil during asserbly,

c. Exercise extreme care in handling' parts which are hard chrome plated for sealing surfaces.

d. Maintain constant inspection of 0-ring seals

- when assembling components over and through their-

' O-rings ;to prevent cutting or otherwise damaging seals during asserbly.

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e. -Use only lint free-rags-for. cleaning.

NOTE: DUE TO THE EXTP2.v2LY SMALL VALVE THECATS IN THE CONTRCL BLOCK,. CLEANLINESS DURING ASSEMBLY.CANNOT BE OVERSTRESSED.

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CRAFTSMANSHIP IS PAPM CUNT

~5.3.2 . Specific asserbly instructions a'. [ Refer to specific ' instruction manuals - (see

. reference section) '

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• PT R-2 Page 4 6

b. It has been found from experience that when assembling the Anker-Holth snubber, if you install the old 0-ring (17) on the piston rod (5) prior to Step 4 and removu the old 0-ring (17) after Step 4, the busing 0-rings and backup rings (11 & 12) will not

. be cut by the piston 0-ring groove edges (Anker-Holth ring) .

,. 5.4 Post-assembly venting of snubber 5.4.1 Prior 'to installing control block, position snubber on bench and fill with General Electric Versilube P-50 until oil issues frca vont holes (30). This is neces-sary to prevent a large pocket of air from forming in cylinder above inlet and outlet connections (refer to Figure 1 of this procedure) (Anker-Holth only).

5.4.2 Install vent plugs and control block.

5.4.3 Install . vent / bypass and filling rig as shown on Figure 2 of- this procedure.

/- 5.4.4 With valves As .B, and C open, continue filling snubber

. k, until all. funnels show oil level.

5.4.5 . Shut valves (A,; B and C) , open valve (E) and pressurize

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system with'10 psig service air to simulate reservoir.

5.4.6' Open bypass valve.D and . slowly exercise _ snubber. piston back and forth using the -variable vise and core-along .

while periodically. opening valves (B & C) to expel all the air from the snubber.

5.4.7f After the' bulk of air 'is removed from the system, remove the service . air -regulator and pressurice snubber to full service: air pressure and inspect-carefully for leaks.

i5.4.8 /If no leaks are evident, remove high pressure service air and reinstall 10 psig regulator.

5.5 Post-assembly testing .

. 5.5.1 Withl oil in reservoir, shut bypass valve (D) and perform snubber ' lockup .by rapidly turning variable : vise. handle.

' NOTE: SOFT AND SPONGY FEELING WILL' INDICATE THAT AIR lIS PRESENT AND..MORE. BLEEDING _IS NECESSARY.

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PT R-2 Page 5 5.5.2 If snuober locks up properly in Step 5.5.1 above, the constant application of force to the vise handle should cause very slight snubber movement.

5.5.3 During lockup and bleed test, check for leakage of fluid around joints and 0-ring seals.

5.6 Reinstallation 5.6.1 If snubber has tested 'out satisfactorily, remove reservoir, leave control block bypass en, and position snubber to correct position as measured in Step 5.1.1.

Leaving the bypass on will enable relatively easy adjustment of snubber during installation.

5.6.2 Mark on side of snubber with indelible marker the date of repair so it is visible during the snubber inspections as per PT R-3.

. Inspection, replacement of O-rings, and testing complete on the following snubbers.

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