05000416/LER-1983-136, Updated LER 83-136/03X-4:on 830830,Div 1 Diesel Generator Shut Down Due to Failure of Exhaust Gaskets on RB1 & LB5 Cylinders & Two Broken Welds on Intercoolers.Caused by Loose Manifold Bolts & Turbocharger misalignment.W/840330

Updated LER 83-136/03X-4:on 830830,Div 1 Diesel Generator Shut Down Due to Failure of Exhaust Gaskets on RB1 & LB5 Cylinders & Two Broken Welds on Intercoolers.Caused by Loose Manifold Bolts & Turbocharger misalignment.W/840330 Ltr

ML20087P814
Person / Time
Site:	Grand Gulf
Issue date:	03/30/1984
From:	Byrd R, Dale L MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
AECM-84-0196, AECM-84-196, LER-83-136-03X, LER-83-136-3X, NUDOCS 8404090393
Download: ML20087P814 (4)

LER-2083-136, Updated LER 83-136/03X-4:on 830830,Div 1 Diesel Generator Shut Down Due to Failure of Exhaust Gaskets on RB1 & LB5 Cylinders & Two Broken Welds on Intercoolers.Caused by Loose Manifold Bolts & Turbocharger misalignment.W/840330 Ltr

Event date:
Report date:
4162083136R00 - NRC Website

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'*' ,- Attachm:nt to c.~ AECM-84/0196 Page 2 of 2 SUPPLEMENTARY INFORMATION TO LER 83-136/03 X-4 Mississippi Power & Light Company Grand Gulf Nuclear Station - Unit 1

' Docket No. 50-416 Technical _ Specification Involved: 4.8.1.1.3 Reported Under Technical Specification: 6.9.1.13.b Event Narrative:

The bolts used to attach the exhaust manifolds to the Diesel Generator exhaust ports were 304 stainless steel..Transamerica Delaval Inc. part number GB-079-118 (item 63, drawing '02-380-06) . The bolts were difficult to unscrew and a visual inspection revealed high temperature discoloration. A subsequent-review determined that 304 stainless steel is not the best choice for the application. The bolts were replaced with 316 stainless steel until replacement bolts of a type more suitable for this service are obtained.

The' crack in the base metal of the LB intercooler was caused by vibration that was induced by the turbocharger misalignment and mounting problems reported in LER 83-107.

The broken stay rod welds on the RB intercooler were caused by insufficient fillet welds. The failures may have been aggravated by the turbocharger bolt problem reported in LER 83-107. The fillet _ welds were specified in the vendor manual to be 1/4" but were discovered to be less than 1/8". The broken welds resulted in small air leaks at the juncture point between the rods and the intercooler. The welds were removed and the area was weld repaired to specifications.

There was no effect on the health and safety of the public nor was there a

-threat to plant safety. All Technical Specification action requirements were met. This is reported pursuant to Technical Specification 4.8.1.1.3 and is submitted as a final report.

• O E MISSISSIPPI POWER & LIGHT COMPANY Helping Build Mississippi P. O. B O X 16 4 0. J CKSON, MISSISSIPPI 39205 A O *. U 4

March 30, 1984 NUCLE AR PRODUCT:ON DEPARTMENT U.S. Nuclear Regulatory Commission Region II 101 Marietta St., N.W., Suite 2900 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Regional Administrator

SUBJECT:

Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-13 File: 0260/L-835.0 Update Report - Division 1 Diesel Generator Shutdown Due to Failure of Exhaust Gaskets on RBI and LB5 Cylinders LER 83-136/03 X-4 AECM-84/0196 This letter submits an update to a previous update report submitted on January 13, 1984. The event for which the report was submitted occurred on August 30, 1983, during a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> surveillance test run. The Division 1 Diesel Generator was shutdown when the right bank number 1 and left bank number 5 cylinder exhaust gaskets failed and a crack and two broken welds were discovered on the intercoolers. The diesel was 98 minutes into the test run.

This was considered a valid successful test pursuant to Regulatory Position C.2.e(3) of Regulatory Guide 1.108. This was reported pursuant to Technical Specification 4.8.1.1.3 and 6.9.1.13.b.

Our investigation into the cause is complete. Corrective actions for the above event are complete or are in the process of being completed. This is a final report. Attached is LER 83-136/03 X-4 with Supplementary Information.

Yours truly,

. . )

L. F. Dale Manager of Nuclear Services EBS/SHH:rg Attachment cc: See next page OFFICIAL COR gzt Il Member Middle South Utilities System

. AECM-84/0196 MISSISSIPPI POWER Q LI2HT COMPANY #8' cc: Mr. J. 7. _ Richard (w/a)

'Mr. R. B. McGehee (w/o)

Mr. T. B. Conner (w/o)

Mr. G. B. Taylor (w/o)

Mr. Richard C. DeYoung, Director (w/a)

Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Document Control Desk (w/a)

U. S. Nuclear Regulatory Commission Washington, D. C. 20555 I

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