ML19326D983
| ML19326D983 | |
| Person / Time | |
|---|---|
| Site: | Prairie Island  |
| Issue date: | 07/16/1980 |
| From: | Tierney F NORTHERN STATES POWER CO. |
| To: | |
| References | |
| NUDOCS 8007250340 | |
| Download: ML19326D983 (1) | |
Text
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TO ' O ? b-So to M f3 9 NORTHERN STATES P'O W E R COMgANY PIL\\llllE ISLAND NUCLEAll GENEllATING PLANT 1111 # 2 Welch,.\\lN 35089 July 16, 1980 Mr. James G. Keppler, Director Regica III Office of Inspection and Enf orcement 4
U S Nuclear Regulatory Corr.ission 799 Roosevelt Road Glen Ellyn, IL 60137 ATIN:
W. S. LITTLE Reportable Occurrence No. 80-20 On 7/15/80 with Unit 2 at 100% power and Unit 1 at cold shutdown, a severe electrical storm caused operation of several breakers in the substation. At about 2030 the main generator was separated from the grid and one of fsite source was lost and the reactor and reactor coolant pumps tripped. Natural circulation was established for core cooling.
At about 2138, No. 10 Transformer was locked out and with only one offsite source remaining (a degraded one), th diesel generators started and closed in on the safeguards buses. Ne safety injection was actuated.
At about 2240 the Cr11 source was restored and at 2319 No. 10 Transforcer was restored putting the plant back within Tech Specs.
At 0137 the next day, the substatien was completely nornal and Unit 2 is now operating at 100% power.
- ely,
M A
y F. P. Tierney, J r.
Plant Manager Prair4.e Island Nuclear Plant FFT/maj cc:
L. O. Mayer
~
eDirector, MIPC (2) m
- " N = tr(bution Services Branch, DDC, ADC C. D. Feierabend Gdh
/g 8007250.3/tf