ML19330B466

LER 80-020/01T-0:on 800715,during Severe Electrical Storm Several Breakers Operated.Main Generator Was Separated from Grid & Reactor & Reactor Coolant Pumps Tripped.Caused by Electrical Storm.Next Day Conditions Returned to Normal

ML19330B466
Person / Time
Site:	Prairie Island
Issue date:	07/29/1980
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19330B462	List: ML19330B461 ML19330B466
References
LER-80-020-01T, LER-80-20-1T, NUDOCS 8008040054
Download: ML19330B466 (1)

Text

CRC FORM 306 U.1. NUCLEA*3 f.EIULATORY COMMISSION (7 771 LICENSEE EVENT REPORT CONTROL BLOCK: l 1

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i 8 9 LICENSEE CODE I4 15 LICEPSE NUM8ER 28 LICENSE TYPE JO 57 CAT 58 CON'T RE O i 7 8 3U l60Ll@l680 l 5 l DOCKET 0 l 0NUMRER l 0 l 3l 0l 886l@l0 89 l EVENT 711DATE l 518 l O'l@l0 74 75 17 1219l810l@

REPOR T ?) ATE 80 EVENT DESCRIPTION AND PROBA8LE CONSEQUENCES h O 2 l With Unit 2 at 100% power and Unit 1 at cold shutdown. a severe electrical storm 1 0 a l caused operation of several breakers in the substation. At about 2030 the main _l 0 4 l Renerator was separated from the erfd and rho ronnent and rancenr enninne nnmna l l

10151 l trioned. Natural circulation unn egenblinhed fnr enre ennling. At thfm nnine run l l

O e i offsite nnuar enneroe ce<11 ov4cema e.

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i At about i ITI'Tl l 2338, No. 10 transformer was locked out and with oniv one off-site source remaining!

(a degraded one), the diesel generators started and closed in on the safeguards buses.

l0l8l l No safety injection ves actuated. Not repetitive. No effect on oublic health l 7 8 9 safety. SYSTEM CAUSE CAUSE COMP. VALyg l CODE CODE SUSCODE COMPONENT CODE SUBCODE SUBCO'EO l 7

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7 8 9 10 68 69 80 E NAME OF PREPARER A A Hunstad 612-388-4767 0 PHONE: h