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Forwards Response to IE Bulletin 79-23 Re Potential Failure of Emergency Diesel Generator Field Exciter Transformer. Review of Excitation Circuitry Indicates Primary Windings of Power Transformer Do Not Exist
	ML19254F407
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	10/31/1979
From:	Bixel D; CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler; NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
	IEB-79-23, NUDOCS 7911090234
	Download: ML19254F407 (7)
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._ s',nr Lj) W General Offices: 212 West Michigan Avenue. Jaciason, Mschigan 49201 e Area Code 517 788 0550 October 31, 1979 Mr James G Keppler, Director Office of Inspection and Enforcement Region III US Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-155 - LICENSE DPR BIG ROCK POINT PLANT - RESPONSE TO IE BULLETIN NO 79-23:

POTENTIAL FAILURE OF EMERGENCY DIESEL GENERATOR FIELD EXCITER TRANSFORMER Consumers Power Company's response to the subject bulletin is forwarded as an attachment to this letter.

David A Bixel (Signed)

David A Bixel Nuclear Licensing Administrator CC Director, Office of Nuclear Reactor Regulation Director, Office of Inspection and Enforcement 1304 329 c-7911090 L

RESPONSE TO IE BULLETIN 79-23 Question 1:

Determine whether or not connections have been made between low KVA rated transformers and high KVA rated EDGs without adequate limitations on the flow of circulating currents. If applicable, provide a description of the~

corrective action being taken to address this problem.

Response

Review of the excitation circuitry used for the EDG at Big Rock Point Plant indicates that connections between the neutral of the generator and neutral of the primary windings of the excitation power transformer do not exist.

The EDG is a " package" unit utilizing a Caterpillar diesel engine rated at 350 bhp and Electric Machinery Manufacturing Company generator rated at 200 kw, 0.8 power factor. The generator utilizes an integral static ex-citer / voltage regulator as shown on the attached drawing (CPCo Dwg. #0740B 30833; Electric Machinery Manufacturing Company Dwg. #358B710).

Sensing voltage for control transformers used in the regulator is obtained from 480 V'AC taps (T2 and T3) on the emergency generator output leads.

The generator output is ungrounded (To tap unused) and is connected to the ungrcunded 480 V AC Emergency Bus 2B through the generator air circuit breaker t. hen an undervoltage condition exists (see Dwg. #0740G30105).

It is concluded that Question 1 is not applicable to Big Rock Point Plant.

Question 2:

Provide a schedule for the completion of a sustained full-load operation test of the EDGs for a duration of not less than 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , or provide the results of a similar long duration, full-load test which has already been completed on the EDGs inst-lled at your facility. The test thould demon-strate full-load carrying capability for an interval of not less than 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , of which 22 hours2.546296e-4 days 0.00611 hours 3.637566e-5 weeks 8.371e-6 months should be at a load equivalent to the continuous rating of the diesel generator and 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months at a load equivalent to the 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months rating of the diesel generator. The test should also verify that voltage and frequency requirements are maintained and that the cooling system functions within design limits.

Response

Presently, load testing of the EDG at Big Rock Point Plant is performed each operating cycle as required by the Plant Technical Specifications (Section 11.4.5.3.A.l(a)).

This is a short interval test of at least twenty (20) minutes at a load of 180 to 200 kw.

This test is performed using a 200 kw, 3 phase resistive load bank.

1304 330

RESPONSE TO IE BULLETIN 79-23 (contd)

Question 2 Response (contd):

Actual testing consists of loading the EDG to 100 kw for 20 minutes; record-ing load, voltage, current, frequency, oil press' ire and cooling water temper-ature parameters. The load is then increased t 190 t 10 kw and maintained for a period of 30 minutes. The same parameters are monitored throughout i

the test interval. Acceptance criteria for a full load test is 190 210 kw at 60 Hzt 5% for a period of not less than 20 minutes.

The preoperational testing of the EDG was performed in September of 1962.

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I This test consisted of loading the EDG to an average load of 185 kw for four (4) hours. During the last hour of testing, a load of 340 amperes and 225 kw was applied intermittently to the EDG for 3-4 minutes of every 10 minutes. The overload was handled satisfactorily.

Original specification, on the EDG indicate that the diesel engine ds rated at 10% overload for one-hour. This is based on a 330 bhp rating at the site (600 ft. elev.) and ambient temperature of 900F DEMA Standard Practice.

Full load rating of the generator is 200 kw at 80% power factor. Specific information regarding a two-hour rating is not provided.

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Name Plate Data is as follcws:

Engine Caterpillar Serial #62B289, Series A Model #343A 6 cyl 5.4 Bore 6.5 Stroke RPM 1800 H.P. 319 Bill of Itterial or ESO No.15260 Generator Electric Machinery Manufacturing Company Serial #IR980611 Type BRKT Frame R27 KVA 250 RPM 1800 V

480 Cycle 60 Phase 3 P.F.

0.8 AMP 300 Inst. Book 67 Based upon the one-hour 10% overload rating on the engine, lack of two-hour rating on the generator, absence of neutral connections between the generator and excitation transformer and maximum load demand on our generator of 215.8 kva (172.6 kw at 0.8 power factor) we do not feel that the test as outlined in this question is applicable to the EDG at Big Rock Point Plant (see attached load profile).

1304 331

RESPONSE TO 1E BULLETIN 79-23 (contd)

Question 2 Response (contd):

i We do feel, however, that a full load 24 hour2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months test at 190 210 kw is a l

reasonable test to assure satisfactory operation of our EDG and we have no objection in performing such a test. Procurement of materials, test 8

I equipment, services (if required), etc.; preparation of a suitable test procedure and scheduling at a convenient outage will di tate the earliest opportunity to perform such a test.

In any case, the test will be per-formci no later than the next refueling outage, currently scheduled for October, 1980.

1304 332 i

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