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

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Forwards LER 81-028/01T-0.Detailed Event Analysis Also Submitted
ML20126K687
Person / Time
Site: Peach Bottom Constellation icon.png
Issue date: 05/11/1981
From: Cooney M
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20126K690 List:
References
NUDOCS 8105200244
Download: ML20126K687 (2)


LER-2081-028, Forwards LER 81-028/01T-0.Detailed Event Analysis Also Submitted
Event date:
Report date:
2772081028R00 - NRC Website

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^i Td PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET

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}~ , d PHILADELPHIA. PA 19101 .

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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

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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 ,

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/ 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