05000277/LER-1978-038-01, /01T-0 on 780908:one Point on Piping Outboard MO-12-15 Had Stress During DBE Above Code Allowable. Restraint to Be Added to Code

/01T-0 on 780908:one Point on Piping Outboard MO-12-15 Had Stress During DBE Above Code Allowable. Restraint to Be Added to Code

ML19289F168
Person / Time
Site:	Peach Bottom
Issue date:	09/22/1978
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19289F167	List: 05000277/LER-1978-038, Forwards LER 78-038/01T-0 05000277/LER-1978-038-01, /01T-0 on 780908:one Point on Piping Outboard MO-12-15 Had Stress During DBE Above Code Allowable. Restraint to Be Added to Code
References
LER-78-038-01T, LER-78-38-1T, NUDOCS 7906040368
Download: ML19289F168 (1)

LER-1978-038, /01T-0 on 780908:one Point on Piping Outboard MO-12-15 Had Stress During DBE Above Code Allowable. Restraint to Be Added to Code

Event date:
Report date:
2771978038R01 - NRC Website

text

NRC FORM 366 L

WUCLEAH $4EGULATOM LUAtAiaSslurd (7 77)

. Unit. 2 LICENSEE EVENT REPORT Report No. 2-78-38/1T CONTROL BLOCX: l l

l l

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) l P l A l P l B l S l 2 l@15 0l0 l-l0 l0 l0 l0 l0 l0 l 0l 0l@l 4 l 1l ll 1l 1l@l l

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9 LICENSEE CODE 14 LICENSE NVMSER 25 26 LICENSE TvrE JO

$7 CAT $8 i

8 CON'T

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OuRC i

8 60 61 COCKET NUMBER 68 69 EVENT CATE F4 75 REPORT CATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h )-unconfirmed accelera l

RWCU inboard isolation valve ( D-12-15 I

O 2

o 3 l DBE in excess of valve's certification. Subsequent evaluation using more l

o 4

l accurate physical parameters and higher valve capability (as certified l

c s l by manufacturer) show valve capable of performing design function as l

0 6

I installed. Unit 2 calculation'however,showed 1 point on piping outboard 1

Ot7 I of m-12-15(thus isolable from reactor)to have a stress during the DBE I

O a I above code allowable.

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8 9 80 E

ODE SUSC E COMPONENT CODE SUB DE S

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9 10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LE R/Ro EVENT YE AR REPORT NO.

CODE TYPE N O.

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Rf 21 22 23 24 26 27 23 29 30 31 32 K N AC ON ON P T

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35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND COHRECTIVE ACTIONS i

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Walworth 6" mark No.N14M3 gate valve-unconfi med excess acceleration of I

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t MO-12-15 proved in error via subsequent calculation and valve certifica-i e i tion. Unit 2 calculated DBE pipe stresses in excess of code will be re-3 l

duced to within allowable by addition of restraint prior to returning l

l the Unit to power.

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8 9 80 STA

% POWER OTHER STATUS O SCOV RY OISCOVERY DESCRl* TION lE l@ l 0 l 9 l 0 l@l NA l

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to 11 44 45 80 PERSONNEL EXPOSURES NUMBEH TY8E

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i PERSONNE L INJURIES DESCRIPTION @

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M. E. Cooney (215) 841-5020 2