ML19291B127

LER 79-032/01T-1 on 790626:insp of Seismic Class I Supports Revealed 92 W/Safety Factors of Less than 5,w/8 Having Safety Factors of Less than 1.Caused by Inadequate Design. All Mods Completed by 790719

ML19291B127
Person / Time
Site:	Peach Bottom
Issue date:	06/26/1979
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19291B126	List: ML19291B125 ML19291B127
References
LER-79-032-01T, LER-79-32-1T, NUDOCS 7908290455
Download: ML19291B127 (1)

Text

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LC FORAl Em6 *" U.~E NUCLEAR REGUL'A1084Y COMMisSIUN Tit Unit 2 LICENSEE EVENT REPORT Report No. 2-79-32/1T-1

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ER QATE EVENT DESCRIPTION AND PROSA8LE CONSEQUENCES h 3 2 I In restonse to the analysis required by IE Bulletin 79-02, Rev.1,12h3 I w,j i seismic class I supports have been analyzed. Ninety two supports have i "TI Ii safety factors less +han five based on a design basis earthquake. Eight i EI of these have safety factors less than one; i.e., may fail during a de- t

) o I sian baeis earthcuake. Safety significance is mini ~.1, because calcula- l

) 7 l tions indicate sutports will withstand the operating basis earthquake. I O a l O&SR Co-4 ttee approved continued plant operation. I 8 9 80

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SE QUE NTI AL OCCURRENCE REPORT HEVISION LE RIRO EVENT Y EAR REPORT NO. CODE TYPE NO.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 i o i The cause of this occurrence was inadequate initial support design. I i6i l Seismically qualified pipe nodifications of all eight supports were i 2 I ccepleted on July 19, 1979 i ila l I i .t l l 8 g 80 ST 5  % POWER OTHER STATUS Ots RY DISCOVERY OESCRIPTION i 3 l El@ l110 l0 l@l U/3 at 100% l [Dl@l Work in IE Bulletin 79-02 l ACTIVITY CO TENT RELEASED OF RELE ASE AMOUNT OF ACTivlTY LOCATION OF RELEASE i c- l N/A l l N/A l LZ_] @ l Z l@SES NUM9ER PEnso~~EL E POS TYPE DESCRIPTION i 7 l 0 l 0 l 0 l@[ Z_J@l N/f l

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NAME OF PREPARER V M.rJ. Cooney /

PHONE:

(215) 841-5020 g o