ML20138J437

Rev 0 to Departmental Instruction 1-MPM-12.17, Torque & Fasteners

ML20138J437
Person / Time
Site:	Millstone
Issue date:	03/22/1985
From:	NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20138J405	List: B11820, Forwards Reviews for Integrated Safety Assessment Program Topics 1.40, Bolting Degradation or Failure & 1.49, Reactor Vessel Surveillance Program, Per . Departmental Instruction 1-MPM-12.17 Also Encl ML20138J437
References
1-MPM-12.17, NUDOCS 8510290343
Download: ML20138J437 (12)

Text

.

MILLSTONE NUCLEAR POWER STATION UNXT 1 4

Yh TO:

DISTRIBUTION DEPARTMENTAL INSTRUCTION NO.

1-MPM-12.17 FROM:

/

M REVISION 0 DEPARTME HEAD DATE 3 -J g 8 [

SUBJECT:

TORQUE AND FASTENERS PAGE 1 of 10 1.

OBJECTIVE This instruction is to define the department standard practice for torquing fasteners when no other specific guidance is provided, for non category one work or for category one work where inspection plans or procedures do not provide guidance.

2.

REFERENCES 2.1 ASME B&PV Code 1983 Edition,Section VIII, Division I, Appendix 2 2.2 Piping Handbook by Reno C. King, 5th Edition, McGraw Hill 2.3 Flexitallic Gasket Co. Inc. Bullctin 171 2.4 General Electric Company Instruction Document GEI-3077C 3.

PRECAUTIONS 3.1 All bolting components shall be inspected for damage and cleanliness before use.

Burrs, nicks, gall marks, rust are not acceptable.

Nuts shall rotate freely over studs or fasteners.

3.2 Flange seating surfaces shall be clean and free of defects which could form a leakage path.

8510290343 851016 i

DR ADOCK 05 j5

1-MPM-12.17 R2v. O Page 2 of 10 4q

.C -

3.3-The correct tools shall be available for properly torquing the bolting components.

Torque wrenches should be in calibration and should also be checked for accuracy before and after use.

The torque being applied should fall between 1/4 and 7/8 of the torque wrench scale.

3.4 Replacement fasteners should be identical to_those originally installed.

If there is any question to-the proper material, or size of fastener guidance can be provided by the Job Supervisor, Foreman or Maintenance Engineer.

3.5 If the overall length of the torque wrench is changed by the use of adapters or extensions, the scale may no longer be accurate.

To determine the actual torque applied refer to Figure 5.4.

4.

PROCEDURE

)

4.1 Torquing Flanged Connectiens 4.1.1 Every. effort should be made to replace used gaskets.

Determine the proper gasket material from the previous application, verify the acceptability of this gasket material for the service intended.

Refer to Figure 8.1 for a cross reference of services and materials.

If some doubt still remains see the Job Supervisor, Foreman and Maintenance Engineer for guidance.

4.1. 0 Inspect the fasteners to be used prior to reassembly.

Burrs, nicks, gall marks, rust are not acceptable.

Nuts shall rotate freely over studs or fasteners.

Repair or replace as required.

4 1-MPM-12.17 R;v. O Page 3 of 10 eh 4.1.3 Replacement fasteners should be identical to those originally installed.

If there is any question to the proper material, or size of fastener guidance can be provided by the Job Supervisor, Foreman, or Maintenance Engineer.

4.1.4 Fit up the flanged connection using the new gasket selected.

Lubricate the fastener threads, and nut faces with nickel special never seez or other approved lubricant.

Tighten nuts to hand tight around the flange and remove excess lubricant.

4.1.5 In the absence of specific torque requirements in the applicable procedure or inspection plan.

The proper torque must be determined.

Refer to historical information for torque data previously h

recorded, consult with the Job Supervisor, Foreman Vendor / Manufacturer and Maintenance Engineer.

If the proper torque.has not been previously determined, the following is required.

Flange size, design (raised face, serrated, etc.) pressure rating, or #

of bolts and their size, fastener markings or material if available the gasket type, gasket ID and OD, system pressure.

4.1.6 Torque should be calculated to achieve minimum preload, (adequate loading necessary to seat the gasket and resist hydrostatic loads) to a maximum of approximately 70% of'the tensile strength of the fastener.

For flexitallic gasket joints refer to p

Section 4.1.8.

1-MPM-12.17 Riv. O Page 4 of 10 4.1.7 Number the bolts so that a torquing sequence can be followed.

Refer to Figure 8.2 for typical torque sequences.

Fasteners should be torqued in multiple passes, the first pass should achieve 25%

of tLe final torque value.

(Flexitallic gasket flange connections should not be torqued beyond 25% on the first pass to avoid local over compression of the gasket)

The second pass should achieve 50% of the final torque value.

The third pass should achieve full torque.

The fourth pass should be used to even the torque on all fasteners at the final torque value.

4.1.8 Torquing of performed spiral-wound, stainless steel / asbestos gaskets.

)

Spiral-wound ring gaskets may be provided with a reinforcing ring of solid metal on the OD, which performs three functions.

1.

Prevents lateral expansion of the gasket when compressed.

2.

Acts as a compression gage; when the flange surfaces are pulled up to touch the ring the bolts are properly loaded.

3.

Centers the gasket in the bolt circle when used in a flange with the same size pressure rating as the gasket and reinforcing ring.

s 1

1-MPM-12.17 l

Rsv. O Page 5 of 10 j

ST:

4.1.9 For spiral-wound gaskets without compression gauges, use the following table to control compression of the gasket during assembly.

Sequences should be the same as described above to ensure even compression to the values given below.

SPIRAL-WOULD GASKET COMPRESSION GASKET RECOMMENDED THICKNESS, IN COMPRESSION COMPRESSION, %

0.0625 0.0075-0.0125 12-20 0.100 0.020-0.025 20-25 0.125 0.025-0.035 20 0.175 0.040-0.050 23-28.5

)

0.250 0.050-0.070 20-28 l

0.285 0.065-0.085 23-30 l

4.1.10 Refer to Figure 5.4 for common calculations relating to torque.

!I' 5.

FIGURES l

l 5.1 Gasket Selection Chart 5.2 Torque Sequence 5.3 Torque Required to Produce Indicated Bolt Stress 5.4 ~ Torque for SAE Grade Fasteners 5.5 Common Calculations CW: dip f.

1-MPM-12.17 Ree. 0 e'.

Page 6 of 10 (h

,'/

S*!*ctiores of Casket Materials for Difrarent Services Fluid App! cation Gasket matenal Steam (begh pressare)...

Temp up to 1000 F 5piraf. wound comp asteses Temp up to 1000 F 5:eef. corrugated or plam Temp up to 3000 F Mone!, corrussico or plam Temp up tc 1000 F Hydrogen annsated fumture iron Tem; up to 1000 F 5tainten saael12 to 14%

chromium, corrugated Temp op to 1000 F Ingotiron specialneg.typejoint Temp up to 750 F Comp. asbestos, spira). wound Temp up to 600 F Wosen asbestos. ene af asbestos Ter: p up to 600 F Copper, corruga:ed or plam Sicam (lom pressure)..

Temp up to 220 F Red rubber. wire ins'ened Wa ter.

Hot. rodum, and high Black rubber, red rubber wire preswes insertad Hot. los pressures Browr. rubber. clotb inseriad Hot Comp. astestos Water..

Cold Red rubber. mire annened Cold Black rubber Cold Soft rubber

-}

Cold Asbestos Cold Brown ru%er. cloth insened Ods (hot)....

Temp up to 750 F Comp. astnstos Temp up to 1000 F Jaget iron, special ring-type joint Oils (cold).

Temp up to 212 F Cork.Sber Temp up to 300 F Neoprent cm.9p asbestos Air.....

Temp up to 750 F Comp. asbestat Temp up to 220 F Red rubber Temp up to 1000 F 5prral-wound comp asbestos Gas........

Temp op to 1000 F Asbestos, snetaLe Temp up to 730 F Comp asbesms Temp op to 600 F Woven asbes.os Temp up to 220 F Red rubber Acids.......

Sheet lead of aDoy saael Hot or cold trdners) ands Comp blue asbestos Woven blue asbestos Amrnonsa......

Temp up to 1000 F Asbestos rnetabc Temp up to 700 F Comp asbestos Weak schroons Red rubber Hot Thin asbestos Cold Sheet lead

• - See Paint. Ihgr.

FIGUFZ 5.1

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1-MPM-12.17 Rsv. 0 2

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-kW COMMON CALCULATIONS T =, ?. x D

• W T = TOROUE (FT-LDSe

}; = FRICTION CONOTAt4T Dn FASTENER DIAMETER (IN INCHES)

W = DESIRED BOLT TENSION (DOLT LOAD IN POUNDS)

TYPICAL VALUES FOR K:

1.

LUBRICATED STEEL O.12 2.

CADMIUM PLATED STEEL O.15 3.

UNPLATED STEEL O.20 4.

SiAINLEEb 07 EEL O.30

'TO DETERMINE THE ACTUAL TOROUE APPLIED TO FASTENER WHEN AN EXTENEION OR ADAPTER IS USED.

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6EIVE*= MBEUEd 5:EUGId T

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EFFECTIVE LENGTH TOROUE WRENCH SCALE READING WHICH TW=

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Figure 5.5 1

y

I L

Docket No. 50-245 ISAP TOPIC 1.49 REACTOR VESSEL SURVEILLANCE PROGRAM

(

October,1985 l

L w

b ISAP Topic No.1.49 Reactor Vessel Surveillance Program I.

Introduction Appendix H to 10CFR50 requires a reactor. vessel material' surveillance program to monitor changes in the fracture toughness properties of ferritic materials in the reactor vessel beltline region of reactors resulting from exposure to neutron irradiation and the thermal environment. Under this program,' fracture toughness test data are obtained. from material specimens withdrawn periodically from the reactor vessel. Based on the

' data, operating pressure and. temperature limits are established for the period of reactor vessel operation between any two surveillance specimen withdrawals.

The purpose of this topic is to provide'an update on this issue for Millstone Unit No. l.-

II.

Review Criteria 1.

10CFR50, Appendix G 2.

10CFR50, Appendix H.

III.

Related Topics / Interfaces None.

IV.

Evaluation At the end of Fuel Cycle 9, NNECO removed surveillance capsule number 2 from the Millstone Unit No. I reactor vessel. On April 12,1985 (Reference

'l), NNECO submitted the results of evaluations conducted on the capsule specimens, in accordance with 10CFR50, Appendix H, Section III.A and Millstone Unit No. 1 Technical Specification 3/4.6.B.5.

Pressure-temperature operating limits curves valid to 16 effective full power years were developed to the May,1985 requirements of 10CFR50, Appendix G.

V.

Conclusions.

NNECO will evaluate new pressure-temperature operating limits curves and prepare requested revisions to Technical Specification Figure 3.6.1 through 3.6.3, prior to the expiration of the Amendment 62 version of these figures.

' VI.

References l

l.

W. G. Counsil letter ' to Director, Office of Nuclear Reactor Regulation, U. S. Nuclear Regulatory -Commisison, dated April 2, 1985.

i

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