ML20127B482

Forwards Addendum to Torsiograph Tests of Emergency Diesel Generators,Divs 1 & 2 at Perry Nuclear Power Plant-Unit 1 on Cylinder Imbalance, Prepared by Failure Analysis Assoc. Related Correspondence

ML20127B482
Person / Time
Site:	Perry
Issue date:	06/20/1985
From:	Silberg J CLEVELAND ELECTRIC ILLUMINATING CO., SHAW, PITTMAN, POTTS & TROWBRIDGE
To:	Bright G, Gleason J, Kline J Atomic Safety and Licensing Board Panel
References
CON-#285-537 OL, NUDOCS 8506210487
Download: ML20127B482 (7)

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SHAW, PITTMAN, PoTTs & TROWBRIDGE A PARTNERSMip OF PROFESS:ONAL CORPORATIONS 1800 M STREET. N. W.

WASHINGTON, D. C. 20036 TELEcopiER sacar saa-son & saa-sies TELEM 89-26e3 (SMAWLAW WSH4 CASLE ' SHAWLAW

June 20, 1985 DOCKETED USN C

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JAY E. SILBERG. P.C. ,,,,,,,,.,,,,

James P. Gleason, Chairman Atomic Safety and Licensing Board 513 Gilmoure Drive CFFICE OF SECEG?-

Silver Spring, Maryland 00CKETg' /.jEPV!U Dr. Jerry R. Kline Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Mr. Glenn O. Bright Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Wachington, D. C. 20555 Re: The Cleveland Electric Illuminating Company (Perry Nuclear Power Plant, Units 1 and 2)

Docket Nos. 5 0-4 4 0 and 50-4 410 L-Gentlemen:

My letter to you of June 10, 1985 transmitting the torsiograph test report prepared by Failure Analysis Associates indicated that a supplement to the report would cover the cylinder imbalance test. Enclosed for your information is a copy of that supplement.

Very truly,you s, j . (, -

tr

y. g . ilberg Counsel for Applicants"

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! JES:L Service List 8506210487 850620 b

PDR ADOCK 05000440 Q PDR

t i UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION

. BEFORE THE ATOMIC SAFETY AND LICENSING BOARD In the Matter of )

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THE CLEVELAND ELECTRIC ) Docket Nos. 50-440 ILLUMINATING COMPANY ) 50-441

)

(Pcrry Nuclear Power Plant, )

Units 1 and 2) )

4 SERVICE LIST James P. Gleason, Chairman Atomic Safety and Licensing 513 Gilmoure Drive Appeal Board Panel Silver Spring, Maryland 20901 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Mr. Jerry R. Kline Docketing and Service Section Atomic Safety and Licensing Board Office of the Secretary U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Washington, D.C. 20555 Mr. Glenn O. Bright Colleen P. Woodhead, Esquire Atomic Safety and Licensing Board Office of the Executive Legal U.S. Nuclear Regulatory Commission Director Washington, D.C. 20555 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 l Christine N. Kohl, Chairman 1 Atomic Safety and Licensing Terry Lodge, Esquire  !

Appeal Board Suite 105 U.S. Nuclear Regulatory Commission 618 N. Michigan Street ,

Washington, D.C. 20555 Toledo, Ohio 43624 Dr. W. Reed Johnson Donald T. Ezzone, Esquire l Atomic Safety and Licensing Assistant Prosecuting Attorney Appeal Board Lake County Administration U.S. Nuclear Regulatory Commission Center Washington, D.C. 20555 105 Center Street Painesville, Ohio 44077 Gary J. Edles, Esquire Atomic Safety and Licensing Atomic Safety and Licensing Appeal Board Board Panel U.S. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Washington, D.C. 20555 John G. Cardinal, Esquire Ms. Sue Hiatt

, Prosecuting Attorney 8275 Munson Avenue Ashtabula County Courthouse Mentor, Ohio 44060 Jefferson, Ohio 44047

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FaAA-PA-R-85-06-11 QRCEI ADDENDUM TO "TORSIOGRAPH TESTS OF EMERGENCY DIESEL GENERATORS, DIVISIONS 1 AND 2 AT PERRY NUCLEAR POWER PLANT - UNIT l'-

ON CYLINDER IMALANCE Prepared by Failure Analysis Associates Palo Alto, California Prepared for TOI Diesel Generator Owners' Group June 1985 O

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, *l INTRODUCTION AItorsiograph test of the emergency diesel generators Unit 1 Division 1 (U101) and Unit 1 Division 2 (01D2) at Perry Nuclear Power Plant was performed to measure the . angular displacements of the gear train end of the crank-

, shaft. Data was obtained during steady state, transient (startup and coast-down), and cylinder imbalance conditions. This supplement report deals only with the cylinder imbalance test. This test was conducted to determine the response of the engine should a cylinder imbalance occur during normal operation. The effect of imbalance is typically greatest in the half order response. Since the 4th order critical speed (436 rpm) at Perry is close to the normal operating speed of 450 rpm, the response of the 4th order under cylinder imbalance conditions was also determined. The equipment and procedure used for this test along with the results of the steady-state and transient tests were addressed in a separate report [1].

Cylinder Imbalance Response The imbalance test was performed with the fuel to cylinder five left bank disabled. This cylinder was chosen because analyses show that the lar-gest increase in stress due to imbalance is produced by disabling this cylin-der. The engines were operated for two to five minutes at rated speed (450 rpm) with no load and then with a 3500 kW load (50% of rated load), while the torsiograph output was recorded. The effect of imbalance was observed at no i load and at 50% of rated load. The analytical model developed by Failure Analysis Associates for the TDI Diesel Generator Owners' Group was used to

extrapolate the effect of inbalance to full load (7000 kW). This model uses i the modal superposition technique to perform a dynamic analysis of a I

crankshaft. A discussion of the results at 100% load is noted below in item 5 and the test results at 50% load are sumamrized in Table 1. The results of

! similar steady-state conditions with normal cylinder balance are included in i this table for comparison.

The following conclusions and coments can be made from the results of the imbalance tests:

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1) Emergency diesel generator Unit 1 Division 2 is better balanced (i.e.,

the pressure vs. tinie curve is close to the same for each cylinder) I

than engine Unit 1 Division 1. This is indicated by the lower half order response of U102 during both normal and imbalanced steady state tests. The half order response for both engines was within the normal

. range.

2) The total response during the cylinder imbalance tests with no load is  !

Il essentially the same.as the response during normal balanced operation l

} with no load.

3) During the imbalance tests, the half order response increased as expected.

., 4) The added imbalance of disabling a cylinder imparts a rigid body j vibration to the crankshaft. This rigid body vibration does not j induce any stress in the crankshaft. This rigid body vibration

, accounts for the significant increase in the half order during the

! imbalance tests.

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5) During the cylinder imbalance tests performed at 50% of rated load, I the total response and single order response for significant orders increased. Analytical results indicate that at rated load (7000 kW) the maximum amplitude of nominal stresses would increase from 5330 psi to 6910 psi due to this imbalanced condition. This increase is not )

j large enough to affect the adequacy of the crankshaft in either engine. t l

6) The presence of the fourth order in the V-16 engine is caused by both the difference in timing and imbalance between the left and right k

banks., which is a normal condition for these engines. The fourth l order response showed a small increase in engine U101 and a large t

increase in engine U102. The difference in fourth order response between the two engines is due to the different balance between left and right banks in the two engines. The magnitude of the fourth order l

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1 is not large enough to affect the ade uacy of the crankshaft in either engine. .

References ~

l' "Torstograph Tests of Emergency Diesel Generators. Divisions 1 and 2, At Perry Nuclear Power Plant - Unit 1 " FaAA-85-4-1, May 1985.

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i ki Table 1: Imbalance Test Response Unit 1 Division 1 '

Amplitude of Free-End Vibration (degrees)

No Load 3500 kW Order No Imbalance 5 LB* Disabled No Imbalance 5 L8 Disabled 0.5 .022 .103 .095 .378

1. 0 .002 .002 .005 .004 1.5 .043 .045

! .103 .093 2.0 .012 .014 .006 .016 2.5 .064 .072 .130 .138 3.0 .002 .008 .002 .020

, 3.5 .072 .085 .133 -

.161 4.0 .094 .073 .095 .104 4.5 .016 .015 .027 .028 5.0 .002 .002 .003 .005 5.5 .005 .005 .009 .008 6.0 .003 .004 .007 .008 TOTAL .225 .235 .368 .645 Unit 1 Division 2

• Amplitude of Free-End Vibration (deprees)

No Load 35CO kW

, Order No Imbalance 5 LB Disabled No Imbalance 5 LB Disabled 0.5 .007 .053 .013

.268 1.0 .003 .003 .003 .006 1.5 .041 .042 .098 .096 2.0 .011 .012 .005 .013 2.5 .068 .072 .138 .154 3.0 .004 .009 .008 .024 3.5 .069 .077 .129 .163 4.0 .088 .065 .080

.169 4.5 .075 .015 .029 .033 5.0 .001 .001 .001 .005 5.5 .005 .005 .010 .009 6.0 .004 004 .008 .010 TOTAL .215 .198 .330 .605 LB denotes left Bank.

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