ML20127B888

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Comments on May 1984 Draft Tdi Diesel Generator Owners Group Program Plan.Full Insp of One Engine to Owners Group Spec Recommended
ML20127B888
Person / Time
Site: Grand Gulf, 05000000
Issue date: 05/21/1984
From: Laity W
Battelle Memorial Institute, PACIFIC NORTHWEST NATION
To: Berlinger C
Office of Nuclear Reactor Regulation
Shared Package
ML19263A614 List:
References
FOIA-84-459 NUDOCS 8407240367
Download: ML20127B888 (3)
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I OBattelle Pacific Northwest Liooratories P.O. Sos 999 Richland, Wnhington ll 5A. M32 Telepho37512514 May 21, 1984 relu 15.an i

Mr. Carl Berlinger Division of Licensing' Office of Nuclear. Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Dear.Mr. Berl' insert,

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SUBJECTi Technical Basis for Recomnendation That At Least One TDI

., Engines ~ at_ Grand Gulf Should Be Desassembled and Inspected ~.

Reference:

'f 1)' Mis'sissippi Power ~ and Light (MP&L) submittal to

'Mr7 Harold R. Denton dated May 6, 1984 p 2) PNL Review and Evaluation of TDI Diesel Generator Owners' Group' Program Plan dated May 1984 (draft).

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Y PNL and its consultants have reviewed the ref erence submittal and

~s other submi'ttals f rom MP&L dealing with the TDI engines at the s Grand Gulf Nuclear Power Station. Two underlying concerns

. dominate our present position; they are:

1. The recent inspection of the TDI engine following 795 hours0.0092 days <br />0.221 hours <br />0.00131 weeks <br />3.024975e-4 months <br /> of operation on Division 1 and 655 hours0.00758 days <br />0.182 hours <br />0.00108 weeks <br />2.492275e-4 months <br /> on Division 2 were not adequate to determine potential problems. Specifically, visual inspections were employed to detect defects in 7

critical components (conrods, bearings, bushings, engine

block, etc.).

2 There is not convincing evidence that results of the inspection of the TDI engine at the Catawba Nuclear Power Station are applicable to the engines at Grand Gulf. This conclusion stems f rom the absence of QA/QC records to confirm the comparability"of the engines at Catawba and Grand Gulf.

We are therefore in a position of evaluating an "uninspected" engine for licensing without that engine being either a lead or following engines (see Reference 2, Section 2.1 and 2.3).

The areas of significant uncertainty that exist are listed below:

o Wrist Pin Bushines - There were casting defects noted in bushings used (and supplied to) the Shoreham Nuclear 61$72uj4SG7 X&

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OBattelle

] Mr. Carl Berlinger

j May 21, 1984

) Page 2 Station.- It is possible that defective bushings have been g' installed at Grand Gulf. The inspection provided is not j

adequate to rule this out. Further, compression failure of the bushings into the clearance space is possible. Such a f ailure .can lead to engine shutdown. -

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! o Connecting Rods - The inspection given to the conrods was 1 insufficient to determine if cracked rods were replaced j in the Grand Gulf engines. These rods had operated j -. ,- for. sev eral, hundred hours prior to the design change requiring bolt- modification and the TDI SIM 64 to rectify

, th's suspected 'clampin8 force problem (recorquing). We note j .. ~ also that MP&L did not implement the bolt diameter design j

change. ,

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o ' Engine' Bas @ S$ThA FaAA conc 1usions on the inline units do not adequately ' address the narrow margin they calculate between crankshaft lateral forcea (which may be greater in V-engines) and the bearing cap hold down/ immobilization h forces. In the absence of an Owners' Group submittal on the

, problem for "V" engines or an adequate inspection by MP&L, J

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this area remains' unresolved.

( o Engine Block - The MP&L belief that cracks are incon-

.i sequential and stable is not shared by the PNL consultants.

Recent findings at Shoreham raise new concerns on the prob-p2 lem. The FaAA explanation of temperature contrast between a liners and blocks on quick starts is not fully credible; these units reportedly are kept warm via jacket water 1;' circulation at all times, whereas most stationary units are B nat. ,Yet there naa uv reports from these laccer units of comparable problems.

o Heads - The results of the Owners' Group investigation are M not complete. MP&L e valuates the likely cause of f ailure j- as quick starts; this reinforces the present concerns

? of the PNL consultants. Prolonged use without failure

- in other applications does mitigate this concern. I j' o Main Bearing - The photographic inspection data provided by

H~P&L at our May is meeting were inconclusive concerning j torsional load induced' pitting. '

o Turbocharner -

Pre- and port-operational lube system has not i been confirmed to be adequate.

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Mr. Carl Berlinger OBattelle May 21, 1984 .

Page 3 I hope this information'is sufficient for you to communicate our concerns to MP&L and to establish with them the need f or a f ull '

inspection of one engine to the Owners' Group specification. We believe that the need for disassembly and inspection of the second engine will depend on the findings for the first.

Sincerely, D. A. D1haea -

c PNL Diesel O/ Project ,

[ s Concurrence: '

DAD:ri W. W. Laity cc M. Plahuca, DOE /RL f M. Williams, NRC M. Carrington, NRC (2) ,

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