ML20037D413
| ML20037D413 | |
| Person / Time | |
|---|---|
| Site: | La Crosse File:Dairyland Power Cooperative icon.png |
| Issue date: | 06/30/1981 |
| From: | Linder F DAIRYLAND POWER COOPERATIVE |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| GL-81-04, GL-81-4, LAC-7643, NUDOCS 8107100208 | |
| Download: ML20037D413 (5) | |
Text
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D DA/RYLAND h
[k COOPERAT/VE eO box 817 2615 EAST AV SOUTH
- L A CPOSSE WISCONSIN 54601 (EO8) 788-4000 June 30, 1981 In reply, please refer to LAC-7643 DOCKET, NO, f Q,409
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U.
S. Nuclear Regulatory Commission g
's Attn:
Mr. Darrell G. Eisenhut, Director 9'/
N Office of Nuclear Reactor Regulation
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Division of Licensing Division of Operating Reactors
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Washington, D.
C.
20555 af
SUBJECT:
DAIRYLAND POWER COOPERATIVE M
"4 LA CROSSE BOILING WATER REACTOR (LACBWR)
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PROVISIONAL OPERATING LICENSE NO. DPR-45 GENERIC LETTER 81-04 EMERGENCY PROCEDURE AND TRAINING FOR STATION BLACKOUT EVENT
REFERENCE:
(1)
NRC Letter, Eisenhut to Linder, dated February 25, 1981 (2)
DPC Letter, Linder to Ziemann, dated December 21, 1979 Gentlemen:
Enclosed find Dairyland Power Cooperative's (DPC) itemized response to Reference 1.
After reviewing the information requested by your staff, DPC concludes the existing procedures and training practice fully encompasses and adequately addresses the question of a station blackout event.
i If there are any questions regarding this report, please contact us, Very truly yours, DAIRYLAND POWER COOPERATIVE lad d
Frank Linder, General Manager FL:LK/RB:ee 06 cc:
J. G.
Keppler, Dir., NRC-DRO III NRC Resident Inspectors 3
/ /
8107100208 810630 PDR ADOCK 05000409 F
o EMERGENCY PROCEDURES AND TRAINING FOR STATION BLACKOUT EVENTS (GENERIC LETTER 81-04) a.
The actions necessary and equipment available to maintain the reactor coolant inventory and heat removal with only DC power available, including consideration of the unavailability of auxiliary systems.
LACBWR Operating Manual Volume I, Section 3.3.2
" Comp le t c Loco of Electrical Psucr", comp le t e ly covers the actions necessary and the equipment avai lab le to maintain reactor coolant inventory and decay heat removal.
b.
The estimated time available to restore AC power and its basis.
There is a minimum of seven (7) hours to restore AC pouer.
LACBWR Technical Specifications Scotion 5.2.l7.2.3.2.d requirca that cach battery bank in the D.
C.
distribution system be tested to encurc its " capacity is adequate to supply and maintain in OPERADLE status all of the actual emergency load for 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />".
Actual conduct of thic test indicatco the batteries may have greater than 80% capacity in exceso of 8 houro of diacharge.
The longest custained loss of off-site power occurred on July 5,
2975.
The duration of thic outage uas 5 hourc 35 minutes.
During this time the emergency diesel geacrator supplied essential loado.
A aummary of loss of off-site power events through the end of 2979 was previously submitted to y our staff in Reference 2.
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Based on the infrequent occurrence of loca of off-site power, the high reliability and redundancy of the LA and LB Emergency Dicact Generator and the battery systema capacity, restoration of AC pouer uithin the rated 7 hour8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> battery capacity is assured.
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The actions for restoring off-site AC power in the event of a loss of the grid.
Dairyland Pouer Cooperative employa personnel for line, breaker, and substation maintenance and con-struction.
These personnel are available 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> per day, 7 days per veck.
In addition, Dairyland Pouce Cooperative has entered into agreements with i
surrounding utilitica to provide for an augmented pool of experienced personrel to reat' ore pouer in an emergency.
i In addition to the LACBWR Generating Station, the
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Genoa Site includes tuo conventionally povered i
Generating plante and a major suitchyard in the Dairyland Pouer System.
This suitchyard has a 34KV Buo, 69KV Bus and 16LXV Bus.
There are l
presently seven inter-connecting bus ties from these major busses to the grid which can supply
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off-cite pover.
l LACBWR is equipped uith redundant Emergency Diesel Generators and diesel driven High Pressure Service Water Pumps.
Each diesel has its own dedicated starting battery bank.
These four diesels conaume a total of approx:'mately 25 gallons of fuel oil per hour.
On-site fual oil supplies must be greater than 20,000 gallorsa, ensuring a 400 hour0.00463 days <br />0.111 hours <br />6.613757e-4 weeks <br />1.522e-4 months <br /> fuel suppty uith all discels operating.
d.
The actions for restoring off-site AC power when its loss is I
due to postulated on-site equipment failures.
LACBWR procedures delincate the electrical inolation of improperly operating electrical equipment.
The 480 V busca (LA and IB) can be croca-connected in an emergency after a determination is made that a fault does not exist on the de-energized bus.
In the case uhere the fault is in the Racerve Auxiliary Transformer, the answer to concern He above applies.
I e.
The actions necessary to restore emergency on-site AC power.
The actions required to restart diesel generators should include consideration of loading sequence and the unavail-ability of AC power.
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l LACBWR Emergency Procedures delineate the actione necessary t o restart an Emergency Dicael Generator.
Because of oversizing, neither Emergency Dicael Generator requires a loading acquence.
Each Emergengy Dicael Generator is capable of assuming all emergency loads upon auto start, or manua l restart.
Neither Emergency Dicact Generator requires any AC power to start and/or operate.
Each has its con independent starting
.batterice, and the fuel oil pumps are cupplied i
from its output.
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Consideration of the availability of emergency lighting, and any actions required to provide such lighting, in equipment areas where operator or maintenance actions may be necessary.
t LACBWR is equipped uith emergency lighting that automatically energises on a loss of p00e1.
These consist of battery povered and/or DC Bus pcuered lighting.
Although all safety related areas are already covered by emergency lighting, LACBWR is in the process of adding more emergency lighting.
Portab le lighting is provided to supplement the operational needs in areas where access is required.
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Precautions to prevent equipment damage during the return to normal operating conditions following restoration of AC power.
For example, the limitations and operating sequence requirements which must be followed to restart the reactor coolant pumps following an extended loss of seal injection water should be considered in the recovery procedures.
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' LACBWR Operating Manual Procedures for nach individual system include cold and hot
'r~t precautiona and directives.
Since LACBWh nas experienced loca of on-site and off-site AC electric power, thece procedures have been triad and shoun to be effective.
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The annual requalification training program should consider the emergency procedures and include simulator exercises involving the postulated loss of all AC power with decay heat removal being accomplished by natural circulation and the steam-driven auxiliary feedwater system for PWR plants, and by the steam-driven RCIC and/or HPCI and the safety-relief valves in BWR plants.
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The NRC approved LACBWR Requalification Program 1
already incorporates annual review of all emergency I
procedures including " Loss of Electrical Power" drille.
Since LACBWR is the only operating Allia Chalmera Nuclear Reactor there are no simulator exercises required.
i LACBWR in a unique reactor design and does not i
incorporate steam driven amergency cooling pumps.
Natural circulation and/or diesel or gas driven
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pumps can supply the nececeary cooling water.
As stated in concern Hg above, actual experience, and tested Emergened procedures are in effect.
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