ML20205F614

Part 21 Rept Re Connecting Rod Bolts for Dsrv Engines.Listed Procedures Recommended for Next Connecting Rod Insp, Including Replacement of Bolts Due to Cracked Threads & Large Grooves & Galls in Threads

ML20205F614
Person / Time
Site:	Perry, Catawba, Harris, Vogtle, San Onofre, Comanche Peak, Midland, Bellefonte, 05000000, Washington Public Power Supply System, Hartsville
Issue date:	08/13/1986
From:	Barich A TRANSAMERICA DELAVAL, INC.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-86, REF-PT21-86-267-000 PT21-86-267, PT21-86-267-000, NUDOCS 8608190266
Download: ML20205F614 (7)

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Tibnsamenoa  ;'n;;;;*l%';ti ,fn 1 ggl g l Enterprise W;y & 85th Avenue 8{ jj. !9 P.O. Box 2161 6 \ '6 T

Oakland, California 94621 ky' (415) 577-7400 100 years August 13, 1986 g g-l[

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Connecting Rod Bolting ,g~

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Reference:

TDI 10CFR21 Letter, July 2, 1986 l '-

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Gentlemen:

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Pursuant to reference 10CFR21 letter, TDI recommends the following i ecti n procedures be implemented at the next scheduled connecting rod inspection for your engines. -

A. Washer Replacement - Change out all connecting rod washers to the g new style electroless nickel plated washers (P/N R-1317). I f nec 7 essary, stone the rod surface and the bolts to remove any galls in the washer seating surfaces.

g The electroless nickel plated washers effectively eliminate bolt and rod galling on the washer mating surfaces and, therefore, reduce bolt to bolt preload variations.

Identify alI bolts as they are removed as to their respective position in the rod.

B. Bolt inspection - Bolts should be replaced if the threads show either of the following conditions: ,

1. Cracked threads.

2. Large grooves and galls in the threads, large being defined as greater than 25% of the width of a thread load bearing face.

If the bolt is replaced for galling, then it is probable that there are matching galls in the conn rod box threads. These galls must be removed in order to restore proper contact between the new bolt and the box threads and to avoid load-intensifying ef fect of a gall pushing on a non galled surface.

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Page Two C. Conn Rod Bolt Bore Galling Repair Procedure -

1. Remove the link rod, piston and conn rod box from the engine.

2. Thorcughly clean the box bore threads.

3 Smooth out the galls in the threads using Enterprise Tool P/N 02-550-01-80, following the procedure outlined below.

Use this step only on the box threaded holes which are suspected of having galled threads.

Use of the RV-4 Conn Rod Box Thread Lapping Tool

a. Lubricate the lapping tool, Enterprise P/N 02-550-01-B0, and bore threads with kerosene.

b. Thread the tool into the conn rod box bolt bore which is galled.

c. Pulling on the tool with a steady force of between two to four pounds, rotate it counter-clockwise until the threads disengage.

d. Clean the subject box bore threads.

c. Examine the subject threads with a borescope to determine if the galls have been removed. I f not, repeat this procedure as necessary until the galls have been reduced to the level of the thread surface. Do not continue lapping after the high spots have been removed. Continued lapping will result in ex-cessive clearance in the box threads.

I Examination of the bolt which was removed from this hole should provide help in locating the gall or galls in the box bolt bore i threads.

I Note: The tool lap charge is good for only five box bolt bores. It should be discarded or sent to TDI for recharging.after five uses (or if noticeably reduced cutting action is observed).

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! 4. Check to ensure that the new bolt turns freely by hand into and out

! of the cleaned threads.

l 5 Reinstall the conn rod box into the engine.

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Page Three D. Bolt installation - Reinstall the conn rod bolts into the holes from which they were removed. Use an Ultrasonic Bolt Gage (P/N AR-149-000) to ensure even tightening of the conn rod bolts and nuts. The four upper bolts need to be stretched a total of 221 mils (+ mil). The two lower through bolts need to be stretched a total of 38 miTs (+ 1 mil).

A torque wrench must be used during the tightening steps. The torque steps listed in SlH 64, Rev. 1, should be followed until the final step.

At this point, the bolts should be tightened to the above listed stretch values. The tightening must be done with the torque wrench. If the torque required to stretch the bolts to their full stretch (listed above) exceeds 2,000 f t-lbs, remove the bol t and examine for the cause of ex-cessive friction.

Step 5 of the method section of SIM 64, Rev. 1, still applies when torque-Ing the two lower through bolts.

Should you have any questions regarding the foregoing procedures or if you require further information, please contact this office.

Very truly yours, w (I Alan C. Baricb i Manager, Customer Service ACB:rw cc:Di rector, Of fice of Inspection and Enforcement l U.S. Nuclear Regulatory Commission

! Washington, DC 20555 l

Bruce Guntrum, TDI l

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cc: Tennessee Valley Authority W7C126, 400 West Summit Hill Drive Knoxville, Tennessee 37902 Attn: Mr. I.L. Beltz Mashington Public Power Supply System Post Office Box 460 Richland, WA 99352 Attn: Mr. G.K. Dyekman Acting Asst. Program Director frexas Utilities Services Inc.

P.O. Box 2300 Glen Rose, Texas 76043 Attn: Mr. J.T. Merritt, Jr.

Engineering & Construction Manager 3Bechtel Power Corporation P.O. Box 60860 T.erminal Annex Los Angeles, CA 90060 Attn: Project Engineer Georgia Power Company - Plant Vogtle Bechtel Job 9510-001 File X4AK01

! ' Consumers Power Company 1945 West Parnall Road Jackson, Michigan 49201 Attn: J.W. Cook, Vice President Projects A

Tennessee Valley Authority - Hartsville W 10 D224-400 Commerce Avenue Knoxville, Tennessee 37902 l Attn: Mr. C.A. Chandley, Chief I Mechanical Engineering Branch I

. Georgia Power Company l Plant Vogtle l P.O. Box 282 Waynesboro, Georgia 30830 Attn: Mr. George Bockhold, Jr.

Plant Manager l

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cc: #C arolina Power & Light Company Shearon Harris Nuclear Plants P.O. No. 101 New Hill, North Carolina 27562 Attn: Mr. R.A. Watson, Vice President Duke Power - Catawba Mill Power Supply Company P.O. Box 32307 Charlotte, North Carolina 28232 Attn: W.T. Robertson, President

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Nuclear Quality Assurance i

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cc: Mr. C.Y. Chow, Plant Superintendent Taiwan Power Company Maanshan Nuclear Power Project P.O. Box 9, Hengchun 924 Pingtung Hsien, Taiwan, Republic of China Mr. Yoon, B.K.

KNU 5/6 Site Manager Korea Electric Power Corporation Kori, Jang-Ahn Myun Yangsan Kin, Kyung-Nam Korea Mr. Park, Y.T., Project Manager Korea Electric Power Co rporation 86, Samseong-Dong, Kang Nam-Gu Seoul , Korea Bechtel Mr. H. Farin/Mr. W. Gould l P.O. Box 60860 - Terminal Annex Los Angeles, CA 90060 Mr. Kim, Jong Sok KNU 7/8 Site Manager

! Korea Electric Power Corporation l Gaemari, Hong-Nong Myun l

Yeong Gwang Kin, Jeon-Noon Korea Mr. Chol, D.Y.

KEPCO, LA 12440 E. Imperial Highway Norwalk, CA 90650 I

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