ML20005E457
| ML20005E457 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 12/27/1989 |
| From: | Davis A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Larson C NORTHERN STATES POWER CO. |
| References | |
| CAL-RIII-89-27, NUDOCS 9001050266 | |
| Download: ML20005E457 (2) | |
Text
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.DEC 2 7 ;g39 Docket No. 50-282 CAL RIII-89-027 Docket Wo. 50-306 Northern States Power Company
-ATIN: Mr. C. E. Larson Vice President, Nuclear Generation 414 Nicollet Mall Minneapolis, MN 55401 Gentlemen:
This confirms the telephone conversation between Edward G. Greenman of this office and you on December 27 1989 related to the Prairie Island Unit 2 plant trip caused by the opening of,both Reactor Protection System motor generator set output breakers. With regard to this event, we understand that you will:
1.
Conplete an investigation to determine the cause of both Reactor Protection System motor generator set output breakers opening on 12/26/89, 2.-
Investigate and determine the root cause of the lockout for the 345kv substation Bus 1.
3.
In light of the root causes determined for the above, assess your investigation of the trip that occurred on December 21 and determine if there are lessons learned that should be factored into your root cause analysis.
4 Inform the Augmented Inspection Team leader or the Senior Resident Inspector prior to the performance of any testing of any equipment associated with the Reactor Protection System Motor Generator Sets and
-their output breakers and the Turbine Generator substation output breakers.
5.
Submit to NRC Region III a formal report of your findings and conclusions and corrective actions within 30 days of receipt of this letter.
We also understand that you will maintain complete documentary evidence of your investigative effort and furnish this evidence to the NRC's Augmented Inspection Team.
F We'further unoerstand that reactor startup (power operation) will not occur until you have received concurrence of the Regional Administrator or his designee.
Issuance of this C. nfirmatory Action Letter does not preclude the l
issuance of an order requiring implementation of the above commitments, p[
&$of CONFIRMATORY ACTION LETTER
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'None of thesel actions specified herein should be construed to take precedence over actions which you feel necessary to ensure plant aid personnel safety.
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Please advise us immediately if your understarding differs from that set forth above.
Sincerely.
Original signed by A. Bert Davis A. Bert Davis-Regional Administrator
'cc: DCD/DCB :(RIDS)l Licensing-Fee Management Branch Resident Inspector, RIII Prairie
' Island John W.;Ferman, Ph.D.,
Nuclear Engineer, MPCA State Liaison Officer, State of Minnesota J. M. Taylor, EDO T. E. Murley,'NRR E. L. Jordan, AE0D J..Lieberman OE G. M.--Holahan, NRR-J.'A..Zwolinski, NRR J. O. Thoma, NRR J. R. Goldberg, 0GC R. J, firasma, RIII i
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