ML20086F911

Telecopy AO 75-71:on 751107,cracked Weld on Line to RV-35B Observed.Caused by Throttling Down on MO-2-10-154B Resulting in Weld Crack.Repairs Completed.Pipe Vibration Readings Taken to Determine If Mods Required

ML20086F911
Person / Time
Site:	Peach Bottom
Issue date:	11/10/1975
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086F909	List: ML20086F906 ML20086F911
References
AO-75-71, NUDOCS 8401090656
Download: ML20086F911 (1)

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PHILADELPUTA UI.ECTH IC: C0!! PANT

. Pench Botton Atomic Power Station

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• Del t a ,. Penn sylvaninc.'

=s 17314 November 10 Mr James F. O'Reilly, Director .

1975 e

Office of Inspection and Enforcement

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' , United Gtaten Nuclear Recu-latory Con =iscion. g g h y g,/,2., ' g

- 631 Park Avenue l , King of Prunnia,. Pennsylvania 19h06 *

.Gub$cetg A h n o r r.n l Occurrence PL-Hour Tio t i fi c at ion C 'iConfirning.V.

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Ullrich't phone cenversation with Mr. Jim Portlov.

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,' Unit %. T Ut at i!s t'urd e rftMe guf ht~c.r'p=comm

- --. - . Inci=on7 en" Ir/_07 75.,

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Reference:

Licence Number DPH leh m- .. . a,cm

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Technien1 Specification

Reference:

3.5.A.4

' TE UDYt-~nd .. : - 70:277 75 4 r3;;. -- "- - - - - * - - '

- RoTRrt Evenunc.p.cnO2ran'_Itann1nT"-?z1?Y-5**

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.__ pove=.ber C-2f 1975 _ ,

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• kEErdd W'.L - c h ilP.I.&m'+ )_t_n.nj.c PoVer St.tition -% ~*

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h.D. 1,. Delt a ,"E en n syl v aEI'n'.~17 31F~~~~~ ~ ~~ ' ~ ~ ~ '--

Identification of Occurrench:

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• Cruched veld on line' to .RV-353 .(1 inch pipe) .

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Conditions Prior to Occurrence:

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Resetor

.D,5 shutdovadot':C3:oolinctnzeperatio:

.lb?b3.bVdC, ..and ,depree;surized. /; . Reactor _,hhad renay.ed, and RUR G-----,

Description. of Occurrence r ~. .. .. ..

While "B" RER loop .

water. leak.vas. observed inwas operating:in the shutdown cooling mode,.c the vicinity of the MO-2-10-154B valve.

,, j Designction..of Apparent Caute of Occurrence: '~

D ec e.un with lov heat. e the HHR loads.it cysten vac operatinC in the shutdown cooling mode

\ vac necennary to throttle down on 9

MO-2-10-15 A B . ,3,'.Thir. vibration apparently caused the tAnalysis of occurrence:

failure.

The safety inplientions ,

of this occurrence are minimal because.the I 1cotage did not.

ability to deliverrepresent decicn flov. signifteant impairment of the RHR ryston's safely contained to the innedict eY.i. quid. e f fluent from the leak van j

, , area in the torus room. L'eak occurred externel.to the isolation valves.

'- Corrective. Action: '

Pipe. vibrntion in readings vill be.tehen to- determine if modifications nre recuIred o er

. have Failure mata.: b6cn complethd.nting procedures or in pipe supports. Repairs None.

t-5.Very truly yours,

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[ 7 ' M '22 7. 8 T. Ullrich, Superintendent * ,. '

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Peach. Botton Ator-ic Power Stat-lon- ,,

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8401090656 751117 ,

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