ML19347F788
| ML19347F788 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 05/18/1981 |
| From: | Tauber H DETROIT EDISON CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| EF---53-291, NUDOCS 8105260316 | |
| Download: ML19347F788 (3) | |
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i Mr. Darrell G. Eisenhut, Director Division of Licensing Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C.
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Dear Mr. Eisenhut:
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Reference:
Enrico Fermi Atomic Power Plant, Unit 2 NRC Docket No. 50-341 i
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Subject:
Emergency Procedures ar i Training for Station Blackout '_pnts l
In response to your letter of February 25, 1981 regarding Emergency Procedures and Training for Station Blackout Events, Detroit Edison has conducted an assessment of existing and planned facility procedures and training programs with respect to the items mentioned in your letter.
The results are as follows:
a.
The actions necessary and equipment available to maintain the reactor coolant inventory with only DC power available are adequately addressed in Emergency Operating Procedures 29.000.01 and 29.000.05, " Level Control" and " Contingency for Level Restoration", respectively.
Operator direc-tion is provided in the use of the steam driven Reactor Core Isolation Cooling (RCIC) system to maintain an adequate reactor coolant inventory in the event no AC powered systems are available, b.
Operating time of the RCIC system would be limited by the unavailability of the Suppression Pool Cool-ing (RHR) with a resultant increase in the suppres-sion pool temperature.
Our analysis indicates that l
the shortest time required to reach a limiting j
suppression pool temperature is approximately seven (7) hours.
Restoration of an AC power supply within this time period is certainly feasible.
Se 0 81 o s se q3 big i
Mr. Darrell G. Eisenhut May 18, 1981 EF2 - 53,291 Page 2 c.
Actions necessary for restoring offsite AC power supplies to the plant following restoration of the grid are des-i cribed in System Operating Procedures 23.320 " Balance of Plant Auxiliary Electrical Distribution System" and 23.321 " Engineered Safety Features Auxiliary Electrical Distribution System".
The functions of these procedures are included in the licensed operator System Qualifica-tion training, and the need for additional instruction in these functions is not required.
d.
There are no postulated onsite equipment failures which could result in a total loss of offsite AC power.
There-fore, no plant procedures or operator training material have been developed to address this contingency.
e.
The actions necessary to restore onsite AC power will be included in Abnormal Operating Procedures 20.000.27
" Emergency Diesel Generator Failure".
This procedure will include the actions necessary to restart the emer-gency diesel generators and will consider the operation of the automatic load sequencer and the unavailability of auxiliary AC power.
f.
The battery powered emergency lighting is presently arranged to provide lighting at stairwells and. passageways in the event of a loss of the plant normal and essential lighting systems.
Additional battery powered emergency lighting will be installed in the areas of the remote shutdown panel, l
the HPCI room, the RCIC room, and the divisional battery rooms.
g.
The actions necessary to prevent plant equipment damage during the return to normal conditions following the restoration of AC power are described in the System Operating Procedures particular to those systems and components.
Operating procedures pertaining to energizing auxiliary power buses require complete bus unloading prior to energizing the bus.
System Qualification train-l ing includes the above stated procedures and the associated l
steps and precautions.
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As described, the present operator training program adequately l
prepares the Enrico Fermi Unit 2 operators for proper response l
and mitigation of any credible loss of AC power event.
The l
annual requalification program is in the development stage l
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Mr. Darrell G. Eisenhut May 18, 1981 EF2 --53,291 Page 3 and will include the Emergency Operating Procedures and after
- completion of the Termi 2 simulator will Anclude simulator exercises involving the postulated' loss of all AC power with decay heat removal being. accomplished by the steam-driven RCIC and/or HPCI and the safety-relief valves.
The procedures, training, and installation of emergency lighting as described will be accomplished at least six months prior to fuel load except for development of the requalification program which will be complete at least 90 days prior to fuel load.
Sincerely,
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