View source for 05000277/LER-1981-028, Forwards LER 81-028/01T-0.Detailed Event Analysis Also Submitted

{{Adams
| number = ML20126K687
| issue date = 05/11/1981
| title = Forwards LER 81-028/01T-0.Detailed Event Analysis Also Submitted
| author name = Cooney M
| author affiliation = PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
| addressee name = Grier B
| addressee affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION I)
| docket = 05000277
| license number = 
| contact person = 
| document report number = NUDOCS 8105200244
| package number = ML20126K690
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
| page count = 2
}}
{{LER
| Title = Forwards LER 81-028/01T-0.Detailed Event Analysis Also Submitted
| Plant = 
| Reporting criterion = 
| Power level = 
| Mode = 
| Docket = 05000277
| LER year = 2081
| LER number = 28
| LER revision = 
| Event date = 
| Report date = 
| ENS = 
| abstract = 
}}

=text=
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                ^i            Td                    PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET
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May 11, 1991             .it                o."49 s                                 .
Mr . Pc yee . H . Crier, Director Of fice o f Inspection and En fo r c em en t                                                                                    -
3egion I US Nuclear Be ?, ul a t o r y Cc mm :. s s i o n 631 Park Avenue King =of Pr ussia , PA 194N

==SUBJECT:==
LTCEN."Q FVENT REPORT MARRATTV7 D F".C R T PT T o ri

==Dear >'r . Crier:==

The fo l lo wi nfr, o c c ur r e nce was reported to Mr . C. Cowgill, Region'I, Office of Inspection and En fo r c em e nt on April 28, 1981.
Re ference :                Do c ke t No . 40-277 Report No . :               2-41-23 /1T-0 Report Date1                May 11, 1921 Occurrence Date:            April 13, 1991 Facility:                   Peach Po t t om At om i.c Po we r St a t io n RD #1, Delta, PA 17314 Technical Specification Re ference :
Technical Speci ficatio n 6. 9. 2.a . (9 ) requires "nerformance o f structures, systems, or components that require remedial action or corrective measures to prevent operation in a manner less conservative than nssumed in the accident analyses in the safety analyais report, technical specification bases , or discovery d ur i ng pl a n t life of conditions not specifically considered in the safety anal ysis report. . .that require remedial action or corrective measures to prevent the existence of an unsafe condition."                                                                                                        A goo}
Description of the Fvent                                                                                                5 Peach Cottom personnel were informed on April 29, 1991, by the                                                         / /
Engineering Department that a review of the s e i smi c qualifications of selected fans listed in the FSAR revealed that minor modifications are neces sary to assure that certain fans NU Y                                                                     THIS DOCUMEf1T CONTAMIS S                                                       POOR QUAUTY PAGES

Phr.o ?
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will . perform during both a Design Earthquake and a Maximum                       l Credible Earthquake. The f an systems af fected include the                        ;
l follo wing :
Star;dby Gas Treatment System                             OAV20,0BV20,0CV20 Em e r ge nc y Switchgear Exhaust                         OAV15,OBV35 Datter y Room Exhaust                                     0AV36,CBV16 Control Room Fresh Air Supply                             GAV79,0RV79 Diesel Generator Room Fupply                              O A V 611, ODV64 Control Room Em er ge ncy Fresh Air Su p pl y             0AV30,cBV30 Cardox Boom Supply in Diesel Generator Building                                             OAV52,0BV52 Probable Consequences o f the Occurrence Roth units were shutdown at the time o f the discover y o f the de fi cie nc y . Additional structural bracing is required on some of the f an bases a id all bases require dampening vith a snubber or bumper arrangemant in order to be operable during the Design Earthquake.        Due to the low probability o f a scismic event, the safety significance is minimal.
Cause of the Occurrence The fan supports were not designe:i tc meet the seismic requirements.
Tmgediate Corrective Action Design of modifications necessary to upgrade the equipment to withstand the Max im um Credible Earthquake has been completed and the- modificatior.s have beg un . Sufficient f ans will be modified to meet the Technical S)ecification requirements prior to startup.
Ver y trul y yo ur s ,
                                                  '?
j '$           f l1% 6        /
                                             /      J     Coo ne y Su ppfr i n t e n de nt Ce r/er ation Division /Muclear cc: Director, flRC - Office of Inspection and Enforcement Mr . No rm an M. Haller, NRC - Of fice o f Management &
Program Analysir
}}

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