ML20044G010
| ML20044G010 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 05/19/1993 |
| From: | Office of Nuclear Reactor Regulation |
| To: | |
| Shared Package | |
| ML20044G008 | List: |
| References | |
| NUDOCS 9306010315 | |
| Download: ML20044G010 (6) | |
Text
i ff ENCLOSURE t
UNITED STATES
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NUCLEAR REGULATORY COMMISSION
't WASHINGTON D.C. 20505 4 001
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SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION DifRGENCY DIESEL GENERATORS OVALIFICATION REPORT BALTIM0RE GAS AND ELECTRIC COMPANY CALVERT CLIFFS NUCLEAR POWER PLANT. UNIT NOS. 1 AND 2 DOCKET NOS. 50-317 AND 50-318
1.0 INTRODUCTION
On July 21,1988, Part 50 of Title 10 of the Code of Federal Regulations was amended to include a new Section 50.63, entitled, " Loss of All Alternating Current Power," referred to as the station blackout (SBO) rule.
lhe SB0 rule requires that each light-water cooled nuclear power plant be able to withstand and recover from an SB0 of specified duration. Baltimore Gas and Electric Company (BG&E) is planning to add two additional emergency diesel generators (EDGs) at the Calvert Cliffs Nuclear Power Plant, Units 1 and 2, in response to the SB0 rule.
By letters dated January 29, 1993, as superceded by letter dated April 7, 1993, BG&E submitted a request for NRC review and approval of a proposed qualification program for two new safety-related (Class IE) EDGs for the Calvert Cliffs Nuclear Power Plant, Units 1 and 2.
By letter dated May 7,1993, BG&E indicated that is had reviewed the initial commitment to the SB0 rule for adding two safety-related EDGs and determined that it would add one safety-related and one nonsafety EDG. The proposed design, as the result of this change, will have two dedicated safety-related EDGs per unit with the installed nonsafety EDG being capable of providing power to either of the Calvert Cliffs Units as an alternative ac power source.
BG&E further indicated that it would provide the details necessary for the NRC staff's review and approval of the proposed change in its initial response to the SB0 rule. The proposed change does not affect the NRC staff's review of the qualification program for the safety-related EDG.
The safety-related EDG is rated at 5400 kW nominal,1200 RPM, 4160 V ac, 60 Hz i
and is manufactured by Societe Alsacienne de Construction Mecanique de Mulhouse (SACM) of France. The set is a tandem unit using two SACM Model 0D45, 16 cylinder engines coupled with a single generator manufactured by Jeumont Schneider of France.
The following support systems will be supplied by SACM:
fuel oil, lube oil, j
water cooling, starting air, combustion air, exhaust system, governor, and an auxiliaries desk.
BG&E has also comitted to submit a description of the EDG and support systems to the NRC in a separate report.
i gRo6010315 930529 p
ADOCK 05000317 PDR i
. 2.0 EVALUATION The EDG will be designed and qualified in accordance with Regulatory Guide 1.9, Revision 3 (draft), and IEEE 387-1984. The proposed qualification plan for the EDG is based 'on a combination of testing, engineering analysis, and functional testing which is to be performed both at the manufacturer's facilities and at the site prior to placing the EDG in service. The qualification test results will confirm that the EDG meets the engineering design requirements of BG&E for the Calvert Cliffs plant and is qualified for its intended service. The following test program for the EDG has been l
proposed by BG&E.
A.
Factory Testina The unit will be subjected to a factory production test. After " break-in" test runs, the EDG will be tested to verify the capacity, capability, and reliability of the EDG by performing the following factory tests:
1.
Load Capability Tests The unit will be tested to demonstrate its capability to carry load as i
follows:
a.
Load equal to 90-100% of the continuous rating until engine oil and water system temperatures are stabilized plus I hour b.
Short-time overload (105-110%) operation for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> continuous I
i c.
Rated continuous nameplate load (90-100%) for continuous period of 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> d.
Short-time rating load rejection test to verify the acceptable overspeed limits e.
Light or no load operation followed by a load equal or greater than 2700 kW (50%) of the continuous rating) for a minimum of 0.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> 2.
Start and load Acceptance Tests A series of tests will be conducted to establish the capability of the unit to start and accept loads within specified periods of time to meet the plant design requirements.
The EDG will be subjected to one simulated loading sequence based on Calvert Cliffs, Units 1 and 2, load profile values.
This simulation of the loading :;equencing will be continued until the rated 5400 kW generator load value is achieved. Also, a loss of 105-110% load (load rejection test) will be initiated with voltage and frequency monitored. Acceptance will be based on successfully starting, accelerating to rated speed, and supplying the first and succeeding simulated loads until rated load is
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. 1 achieved. Acceptance of load loss will be based on the EDG speed not i
exceeding 75% of the difference between nominal speed and the overspeed trip setpoint or 15% above nominal, whichever is lower.
In lieu of 300 valid start and load tests with no more than 3 failures, as recommended by IEEE 387-1984, BG&E will perform 35 tests consisting of i
30 start and load tests from the " keep warm" conditions, and 5 additional start and load cycles from the normal engine operating temperatures.
The ability of the EDG to start, to accelerate to rated speed in s 10 seconds, and supply the 2700 1 5% kW step-load for a period of time to reach engine equilibrium conditions, will be the acceptance criteria for this test.
To justify the lower number of tests (35 start and load tests), BG&E submitted in the attachments to their letter of April 7,1993, technical data, information, references, and test results of similar EDG units tested at the factory.and at different sites. These tests and their r
results are semmarized as follows:
1.
At Krummel Nuclear Plant (Germany) where the site was supplied with three V16 and three V20 versions of the Model UD45 diesels, the V20 version was selected for load and acceptance test. The tests included over 600 start and load cycles without a failure.
2.
At Electricite de France - Cruas Nuclear Plant (France), a Model UD45 engine was tested with 1500 start and load tests without a failure.
3.
The ASCO Nuclear Plant (Spain) is equipped by four Model UD45 EDGs.
The units were tested at the factory and at the site successfully. At the factory the tests included over 100 start and load tests without a failure. At the site 35 valid tests were successfully performed on each EDG.
4.
At Prairie Island (USA) two tandem EDGs (UD45) were tested per NRC-approved qualification plans. The intent was to qualify EDGs consistent with IEEE Standard 387-1984, Regulatory Guide (R.G.) 108, Revision 1, and R.G. 1.9, Revision 2.
The test results confirmed the ratings and capabilities of the two EDGs.
5.
The Yonggwang NucTear Plant (Korea) has four tandem EDGs powered by Model UD45 engines. A total of 300 valid start and load tests have been m.rformed successfully on one of the four units.
The reliability of similar SACM EDGs has been satisfactorily demonstrated based on the test results discussed above. Taking into consideration the results of the previous testing, the staff has concluded that testing the unit 35 times, as requested by BG&E in its letter of April 7,1993, is justified and, therefore, acceptable.
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i i l 3.
Marain Tests The purpose of the margin tests is to demonstrate the EDG capability to start and carry loads that are greater than the magnitude of the most severe step load. Two margin tests will be performed and a total load value equal to the largest single sequenced load plus 10 percent will be used.
In addition, loss of the largest load will be initiated with the voltage and the frequency monitored during the transient.
The staff has reviewed the proposed factory production test program and, based on the details provided above, have concluded that it is acceptable.
B.
Site Testina i
After installation, BG&E will use guidance contained in draft R.G.1.9, Revision 3, to verify in-situ performance of the EDG and its associated support systems. The test program will be as per Table 1 of R.G.1.9, Revision 3, "Preoperational and Surveillance Testing."
1.
Component Prerecuisite Testina This testing is to verify the proper operation of controls, setpoints, and initial operation of the various components.
2.
Preocerational Testina The new EDG will undergo the preoperational testing program as listed in Table 1 of R.G.1.9, Revision 3, which will concentrate on testing the controls, interlocks, alarms, monitoring systems, and support systems such as the starting air system, and lube oil system.
In addition, the unit will be subjected to a minimum of 25 valid start and manual loading to 90-100% of continuous rating without failure to demonstrate that an acceptable level of reliability is achieved. Of the 25 start demands, 12 will be fast starts and 13 will be sis: : tarts. All of the slow starts will be from a preheated, normal standby conditions as will 9 of the 12 fast starts. The remaining three fast starts will be from a hot engine conditions. One f the tests included in this test series will be a demonstration of tne EDG hot engine restart capability
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(after a 24-hour test run).
The above proposed site testing program is in accordance with R.G. 1.9, Revision 3, and is, therefore, acceptable.
In addition to the above test program, the licensee addressed the following additional items:
1.
Seismic Oualification i
The EDG (engine & generator) has been previously quslified to criteria which will be confirmed to envelop the Calvert Clif ts site specific seismic response spectra. Some peripheral equipment, such as the auxiliary desk and the control panel, will be directly qualified to the Calvert Cliffs specific criteria. Diesel generator protective devices are Class 1E devices and are seismically qualified.
2.
Environmental Oualification and Aaina Recuirements The EDG will be located in a mild environment. The engine room design air temperature ranges frdm +50*F to +120*F based on an outside ambient temperature range of 0*F to +95'F.
The humidity design criteria for the equipment is 10 to 100% relative humidity, non-condensing.
1 The aging requirements of the components and assemblies will be classified and qualified for the EDG prior to being placed in service as per the requirements of Section 7.3 of IEEE 387-1984.
In addition the manufacturer has performed calculations cf the torsional
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vibration and determined that no harmful vibrations occur within 15% of the synchronous speed or 110% of the subsynchronous speed as required in Section 5.5.1.2 of IEEE 387-1984.
3.
CONCLUSION Based on the evaluation discussed above, the staff concludes that the factory I
production testing and in-situ testing of the EDG will provide reasonable assurance that the new safety-related EDG will meet the intent of the regulatory and engineering design requirements (capacity, capability, and reliability).
This conclusion is predicated on the results of the 35 start and load tests confirming the ratings and capabilities of the safety-related EDG as discussed l
above.
l Principal Contributor:
S. Saba Date: Mby 19, 1993 t
6
Mr. Robert E. Denton M y 19, 1993 This acceptance is predicated on the results of the 35 start and load tests
. confirming the ratings and capabilities of the EDG as discussed in the enclosed SE.
We have completed all actions related to TAC Nos. M85715 and M85716.
New TAC Nos. will be opened for tracking the staff's actions in reviewing BG&E's proposed change to the SB0 rule Sincerely, Original signed by:
Daniel G. Mcdonald, Senior Project Manager Project Directorate I-1 Division of Reactor Projects - I/II Office of Nuclear Reactor Regulation
Enclosure:
Safety Evaluation cc w/ enclosure:
See next page Distribution:
Docket File CVogan PGill, 7/E/4 NRC & Local PDRs DMcDonald CBerlinger, 7/E/4 PDI-l Reading OGC SVarga ACRS (10)
CMiller, Acting AD CCowgill, RGN-I RACapra SSaba, 7/E/4 m
LA:PDI-l PM:PDI-D:PDI-l s
y DMcDonald:smm RACapra CVogan v
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OFFICIAL RECORD COPY FILENAME: CC85715.LTR f
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