ML19330A237
| ML19330A237 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 08/13/1971 |
| From: | Castleberry R BECHTEL GROUP, INC., CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | |
| Shared Package | |
| ML19330A236 | List: |
| References | |
| NUDOCS 8007151013 | |
| Download: ML19330A237 (6) | |
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I RESPONSES TO SAGINAV I!TTERVENORS' CROSS-EXAXINATION QUESTIONS WITH RESPECT TO THE EMERGENCY POWER SUPPLY SY3 FEM 1.
What degree of constancy of speed vill be maintained by the Diesel Generator (DG) during the first two minbus of loading and operation?
tsasver:
Speed governing stability is expected to be in accordance with the re-quirements of Section IV of IEEE Standard No.126 (renaaed fran AIEE 606),
"Recomnended Specificaticn for Speed Goveming of Internal Ccabustion Engine Generator Units" attached bereto.
2.
What amount of speed droop during.the first two minutes of loading eni operation of the DG will be considered acceptable?
Answer:
When each diesel generator is operatir.g independently, as is required in the event of LOCA sequence loading, the govemor vill be req" ired to maintain isochronous operaticn, wh1G means there vill be no speed dmop.
3 what provisier.s vill be made to prevent the DG from hunting or tending to hunt?
Answer:
Steady state goveming speedband is expected to be in accordance with the requirements of Section IV of IEEE Standard No. 126, "Reccumended Specificaticr. for Speed Govemin6 of Internal Ccubustica Engine Ge. era-tor Units."
The need for stability aids such as buffer compensation systems vill be detemined in accordance with the engine generator manufacturer's recczanendations at the time of purchase.
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is. '. tith Wat type of speed governor vill the DG be equipped?
Answer:
The engine generator manufacturer's specific recomendation vill be considered at the time of purchase. However, it is expected at this time to be of Woodward EG series.
5 ht amount of voltage dip vill be censidered' acceptable for the generatorf Answer:
1 A voltage dip to 75 percent of nnminal on the utilization volt.16e base vill be considered acceptable during sequence loading steps.
6.
What is the recovery time for voltage to return to 90 per cent of rated voltage after application of each load step?
Answer:
A recovery tine of 2 seconds for the volta 6e to return to nomal vill be considered acceptable following the application of each load step.
7 What vill be the nor.nal jacket temperature of the DG prior to start?
Answer:
This is a design detail which will be detemined in cooperation with the engine manufacturer. Temperatures vary frcxn one manufacturer to another.
8.
How is the nonal standby jacket water temperature controlled?
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Answer:
Stendby Jacket vater temperature vill be themostatically controlled and will be monitored by high and lov temperature alams.
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l 9 Will cooling water from the heat exchangers be permitted to flow through the jacket when the DG is not r - int?
Insver:
Engine jacket water does not nomally flow through the test exchangers when the diesel engine is on standby. Until the engine is at oper-ating temperature, the jacket water bypasses the cocling dence.
10.
How long can tae DG run at full load without op ration of the jacket water cooling pump?
I' Insver:
It is not a deJign objective to operate without the jacket water cooling pump. However, it is expected the engine vill be capable of full load operation without cooling water circulaticn through the heat exchanger for a period cf 3 minutes following a standby start.
11.
ht will be the nemal crankesse temperature prior to start? How is it controlled?
Answer:
This is a design detail which will be detemined in cooperation with the engine mar.ufacturer. Heating means which inherently introduce the danger of lubricating oil carbonizing, with ccusequent foulina, vill be avoided.
- 12. What vill be de Diesel engine heat load during full operation?
Answer:
This is a design detail which will be determined at the tim of se-lection of the manufacturer.
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l 13 ht vill be the 6enerator heat load during full operation?
Answers Generator beat load at Nll operation is expected to be less than 120 W.
1 16 Vill the DG trip and automatically shut down on a lov oil pressure signal?
Answer:
Yes.
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15 Will the DG trip and autcenatically shut down on a high jacket water temperature sigral?
Answer:
Yes.
- 16. With respect to maintenance of the diesel, how frequently vill the diesel be run?
Answer:
Each diesel generator shall be manually started each month and demon-strated to be ready for loading within 10 seconds. The generator shall be synchronized to the emergency bus from the control roan, and loaded to the nameplate rating.
17 For how long a time period during each test run vill the diesel operate?
I,nswer:
The diesel generator shall be operated witn a load equal to the engine nameplate rating for the time required to reach a temperature equilib-rium.
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- 18. What design and operating procedures have been incorporated for the Midland Plant that vill prevent the sort of DG failure which occurred on all three DGs at the Connecticut Yankee plant April 27,1%87 Answer:
It is our understanding, based on the description published in Vol.15,
!!o. 5 of the At:rsic Energy Clearing House, February 3,1%9, that load sharing capabilities of the 3 diesel generators were smehov affected during repeated attempts to restore outside power. The diesel ganera-tors and engineered safeguards buses as designed for the Midland Plant are in accordance with the recommendations set forth in Safety Guide 6 for independence between redundant standby onsite power sources and between their distribution systems. The diesel generators are never autcxiatically paralleled and manual synchronizing, conducted only for load testing, vill be supervised by interlocks.
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The foregoing responses to Saginaw intervenors cross examination questions with respect to the emergency power supply and the response to the question from Dr. Goodman on emergency power supply systems have been prepared under my supervision and are true to the best of my knowledge.
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4 Y M M '1 Robert L. Castleberry Bechtel Corporation Fifty Beale Street i
San Francisco, California 94119 Subscribed and sworn to before me this 13th day of August, 1971 w fk) M Notar$7ublic San Francisco County, California My Commission Expires November 7, 1971 m m HENRY c. wlLLIAkl5 9 mouir muc.cAuram an no cou m or san FRAp05c0 I