ML20217N006

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Rev 6 to MP 743.1, DG Injection Nozzle Replacement
ML20217N006
Person / Time
Site: Millstone  Dominion icon.png
Issue date: 08/20/1997
From:
NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20217M993 List:
References
MP-743.1, NUDOCS 9708250415
Download: ML20217N006 (11)
v • d • e


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O) hill.LSTONE NUCLEAlt l'OWER STATION A1AINTENANCE l'ItOCEDUllE Diesel Generator Injection Nozzle Replacement MP 743.1 Rev. 6 A

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,iV Level of Use Sh1E: J. Pernal General

Millstone Unit 1 Maintenance Procedure Diesel Generator Injection Nozzle Replacement TABLE OF CONTENTS 1.

PURPOSE....................................................2 2.

P R E R EQ U I S ITES.............................................

2 3.

P R E CAUTI O N S...............................................

3 4.

I NSTR U CTI ON S..............................................

4 4.1 injection Nozzle Assembly Removal.........................

4 4.2 Injection Nozzle Assembly Installation.......................

5 5.

R EVI EW A N D S I G N - O FF.....................................

8 6.

R E FE R EN C ES................................................

8 7.

S U M M A RY O F Cl l AN G ES.....................................

8

. A1 TAC 11MENTS AND FORMS

-, " Injection Nozzle Assembly"........................

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1. PURP.QSE 1.1 - Objective This procedure provides instructions for the replacement of a diesel generator injection nozzle assembly.

1.2 Discussion The diesel generator injection nozzles are enclosed in the injection nozzle compartment and are located symmetrically with one pump and nozzle on each side of each cylinder.

The injection nozzles are the closed, differential, hydraulically ope /ated type. The nozzles use a spring-loaded valve with a seat near the spray orifice to close the orifice after each injection of fuel into the combur. tion chamber. The valve is hydraulically operated by the pressure of the fuel oil being delivered by the injection pump.

1.3 Applicability This procedure applies to the diesel injectar nozzles installed on M8-8

" Emergency Diesel Engine and Ocnerator."

2.13EREOUISITES 2.1 General I

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2.1.1 N/A 2.2 Measuring and 1bst Equipment (M&TE) 2.2.1 All M&TE has been calibrated in accordance with WC 8,

" Control and Calibration of Measuring and 1bst Equipment" and the calibration is current.

2.2.2 QA torque wrenches (click or dial type) with a minimum accuracy and maximum torque wrench full _-scale value listed in the table below for the specified torque application range.

Specified 7brque Maximum Ibrque Wrench Minimr.m L

Application Range Full Scale Value

_ Accuracy 20 to 25 ft+1bs Between 75 and 100 ft'Ibs 5%

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2.3 Tools and Consumables O

2.3.1

'Ibols Mechanivs standard tool kit

'Ibrch 2.3.2 Special'lbols Injection nozzle holder removal tool 2.3.3 Spare Parts Spare injector nozzles Nozzle holder assemblies Nozzle holder gaskets 2.3.4 Consumables Approved cleaning solvent such as Polywater flydrafoam 2020 l

lbmporary cover for injection nozzle opening l

2.4 Definitions 2.4.1 OUENC11 - lb cool hot snetal by thrusting in water.

3. PRiiCAUTIONS 3.1 Avoid striking nozzle assemblics against hard suifaces 8 hat can dent or othetwise damage seal surfaces or contours affecting the injection spray pattern.

3.2 llefore installation, verify cicanliness and freedom from defects of the nozzle assemblies and gasket.

3.3 Ensure :dl consumables to be used in or on power plant components are controlled in accordance with CC 1, " Control of Chemical Consumable Produck and a Restricted Use Permit has been issued as necessary."

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4. INSHtuCI1ONS NOTE Since either or both of tlic two injection nozzles inay be faulty in a given malfunctioning cylinder, both injection nozzles are nornially replaced.

4.1 Injection Nonic Assembly Removal 4.1.1 DISCONNECT injection tube from injection pump.

4.1.2 DISCONNECT drain tube from lower drain header.

4.1.3 Visually INSPECT fuel lines for degradation and IE necessary, REPLACE fuel line(s).

4.1.4 COVER fuel line openings.

4.1.5 Itefer 'lb Attaciunent 1, and REMOVE stud nuts (3) from sleeve collar adapter (2).

4.1.6 O

REMOVE nozzle holder collar (4) from sleeve collar adapter (2).

4.1.7 INSTAL.L injection nozzle holder removal tool as shown in 1 igure 1.

O Level of Use MP 743.1 STOP' THINK '

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STOP WARNING STOP Specialinjection nozzle holder removal toolis a slide hanuner. Avoid p nehing hand between slide hammer and end stop.

Figure 1 Injection Nozzle lloider Removal'1bol

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4.1.8 Refer'Ib Attachment 1, and REMOVE injection nozzle assembly (1) from injection nozzle adapter (11).

4.1.9 REMOVE and DISCARD nozzle gasket (5).

CAUTION Care must be exercised to prevent foreign material entry into cylinder any time that injection nozzle is removed.

4.1.10 Unless another fuel injection nozzle assembly is to be installed immediately, COVER nozzle hole in cylinder liner.

4.2 Injection Nozzle Assembly Installation -

4.2.1 Using an approved solvent, CLEAN gasket seating surface.

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C A UTIO N lleating of nozzle gasket must not be performed in diesel room.

NOTE lleating and quenchin ensure proper m:ating.g of copper nozzle gasket will soften the gasket to 4.2.2 TRANSFER nozzle gasket to maintenance shop or approved work area outside of diesel room.

4.2.3 Using torch or open flame, llEAT new nozzle gasket (5) to a dull "cheny red," and quickly OUENCil in water until nozzle gasket is cool.

4.2.4 -

INSPECT nozzle gasket and ENSURE there are no signs of overheating such as irregular or blistered surfaces.

4.2.5 IE installed, REMOVE cover from nozzle hole in cylinder liner.

4.2.6 Refer 'Ib Attachment 1, and INSTALL new nozzle gasket (5) onto injection nozzle (1).

4.2.7 ENSURE nozzle gasket is properly seated.

4.2.8 INSTALL new injection nozzle with gasket into injection nozzle adapter (11).

4.2.9 ENSURE " TOP" indication stamped on outside face of nozzle assembly is positioned at top center.

4.2.10 POSITION nozzle holder collar (4) onto sleeve collar adapter (2).

4.2.11 REMOVE covers from fuel lines.

4.2.12 ENGAGE threads of injection tube to injection pump and nozzle drain tube to lower drain header, but do not tighten connections

- at this time.

4.2.13_ INSTALL stud nuts (3) onto sleeve collar adapter (2).

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as CAUTION Uneven or excessive tightening may distort no:21e body or damage adapter.

4.2.14 Evenly TORQUE stud nuts to 20 to 25 ft+1bs.

4.2,15 1(ECOltD the following onto AWO:

Measured torque M&TE scrial No.

Calibration due date 4.2.16 TIGilTEN fuel tubing connections, n

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5. REVIEW AND SIGN-OFF O

V 5.1 Review and sign-oif for this procedure is satisfied by review and sign-off of the AWO.

6. REFIIRENCES 6.1 NNECO Accident Prevention hianual 6.2 Vendor hianuals 6.2.1 25202-261-001 A, Fairbanks-htorse Diesel Service hianual 6.2.2 25202-261-002A, Fairbanks-hiorse Opposed Piston Engine Service Manual,"hiodel 3800TDS-1/8 Diesel Stationaty" 6.2.3 25202-261-003A, " Renewal Parts P3800TD8-1/8 hiodel 3800 8-1/8 Diesel Stationary

6.3 Administrative Procedures 6.3.1 -

CC 1," Control of Chemical Consumable Products" O

6.3.2 WC 8," Control and Calibration of hieasuring and 1bst Equipment" 6.4 Other Documents 6.4.1 Fairbanks Morse Service Information Letter, Volume A Issue 10 l

6.4.2 Fairbanks hiorse Service Information Letter, Volume A Issue 15 6.4.3 PIR-1 085 l

7. SUhthiARY OF C11ANGES 7.1 Various editorial changes were made as a result of the Biennial Review.

7.2 Added inspection of fuel tubes per' PIR--_1-91-085.

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7.3 Added step to transfer nozzle gasket to maintenance shop or approved

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work area outside of diesel room when heating. Amplified instructions for heating and inspecting nozzle gasket.

7.4 Added applicability section to procedure.

7.5 Modified Figure 1 to remove the nozzle holder collar in order to install nozzle remeval tool.

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Att,qchjugnt 1 Injection NonIe Assembly (Sheet 1 of 1)

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l1 If,I DESCRIPTION QUANT 11T 1

Injection Nozzle 2

2 Sleeve Collar Assembly Adapter 2

3 Collar Stud Nut, %-24 4

4 Nozzle Holder Collar 2

5 Nozzle Gasket 2

6 Ad er Gland Nut 2

7 Ad

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8 Injection Nozzle Water Jacket Adapter 2

9 Adapter Seal Ring 2

10 Adapter Gasket 2

11 Injection Nozzle Adapter 2

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