ML20086H933

Telecopy AO 75-29:on 750426,MSIV 86D Closed Fast.Caused by Minor Oil Leak in Valve Control Hydraulic Circuit. Adjustments Made to Hydraulic Control Circuit

ML20086H933
Person / Time
Site:	Peach Bottom
Issue date:	04/28/1975
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086H927	List: ML20086H924 ML20086H933
References
AO-75-29, NUDOCS 8401200354
Download: ML20086H933 (1)

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PIIILAD}1rHI A TLECTRIC CO.TPA!.*/

Perch 2'ot ten Ato:nic Powr Station IMita, Pennnylvania 17314 April 28, 1975 Hr. J.ma P. O'Re!Ily,, Director _J) -,

• 3ffico-oTJno;.s-et ioit -end h etw& u u NM

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United States liuclear Regulatory Cor:sistaion 631 Pt.tk Avenuo g f h C)/./?7tL C-Etos of Pru:mia, Pennsylvenia 1940G

Subject:

A%orral Occurince_ 21-Hour Ibtification Contir:sinn W. T. U11 rich's phone convercation vith Mr. J. Partlow, Regioit 1, Faited States I?ucicar Retult. tory Cr:cienfon, on April 26, 1975.

IMfercuco: License Uttt.ber DTR-44 Technical Specification Referent.e:

4.7.L.1.b(2) and Table 3.7.1 .

Ecport no.: 50-277-75-29 Report Date: 1pril 20, 1975 Decurrence Date: April 26, 1975 Faci.11ty: /

Pecch Lotto:t Atenic Power Station 5 E.D. 1 Dalta, Pennsylvania 17314 4 Identifiention of Occurrence: b, 3'e Fast closuro of 1:31V GCD.

Conditions Prior to Occurrence Unit 2 operating at upprorhtely 75% of full pover. '/

Decer/pcion of Occurrence:

Durint a rcutine r.u:veillance test the h onter ir.olctie i vrim en Unit 2 c.lrd:;J in 2.5 cceands. Clocura tism an r.Mcified in the Technical Specificctions in tree tcr than 3 r er a-.da. A--*-

.? r r t'.n 0 w: 2w.

Denignatiert of Apparent ('ause of Occurrence:

liinor oil ic4k in valve control hydraulic circuit.

Axualynia of occurrenca:

The curvc111 race tect perforr.-d on April 1"G,1975 indicated that all but one of the eight l*3IV's clor,ed within the allot.mbin tira. Fast closure of the CSD valve by 0.5 eetends vould not cinnific.-ntly chr r the cax.f tnra presrure reachi d in um reactor vnenet if .n icolation occurred.

safety cinnificance. .

is F

occurrence, therefore, has ninire,r2

.h e-Corrective Action:

Adjustnants at 3.5 c.ecords.were rude to the hydraulic s tru h circuit to cet the valve closing tfr.a railure Data:

A previcu2 occurrence of this typo was repertes as A.O. 50-277-74-7.

A Very truly yours,

/N?

U. T. Ullrich, Superintcadent Fcach 1.oteca Ato'alc Puer Station 8401200354 7505d6 1~

PDR ADOCK 05000277 S PDR .

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