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

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

ML20126K687
Person / Time
Site:	Peach Bottom
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: 05000277/LER-1981-028, Forwards LER 81-028/01T-0.Detailed Event Analysis Also Submitted 05000277/LER-1981-028-01, /01T-0:on 810428,determined That More Detailed Analysis Was Required & Minor Mods Were Necessary to Assure That Certain Fans Would Perform During Earthquakes.Caused by Fan Supports Not Meeting Seismic Requirements
References
NUDOCS 8105200244
Download: ML20126K687 (2)

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

Event date:
Report date:
2771981028R00 - NRC Website

text

-

.-3.n

^i Td PHILADELPHIA ELECTRIC COMPANY 2301 M ARKET STREET [T.' Y,'

_i,..

t' P.O. BOX 8699 d

}~, d PHILADELPHIA. PA 19101

,/

7 M/

m si e414ooo

? OY\\3. ' N

.Q,g

-(-!O,j 9

• igy y. ',>,J y 3

a

?

.,.e 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."

Agoo}

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 ?

l will. perform during both a Design Earthquake and a Maximum 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,

'?

lf 1% 6 j

/

/

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