ML20086K352

AO 75-16:on 750212,excessive Leakage Found on HPCI Turbine Exhaust Check Valve 23-65.Caused by Minor Surface Imperfection in Disc & Seat.Valve Disassembled,Disc Machined & Seat Lapped

ML20086K352
Person / Time
Site:	Peach Bottom
Issue date:	02/22/1975
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A Office of Nuclear Reactor Regulation
Shared Package
ML20086K355	List: ML20086K352 ML20086K371
References
AO-75-16, NUDOCS 8401270039
Download: ML20086K352 (2)

Text

.

l O O

• l PHILADELPHIA ELECTRIC COMPANY .,

.hg;

%'. c , g U

~

2301 MARKET STREET

- kfg~ s ,,p ! ..

U% Cf PHILADELPHIA, PA.19101

'(

taim e4i.4ooo ,N v r

,(s,.-

Fcb mary 22, 1975 Mr. A. Gianbusso, Director Division of Reactor Licensing Office of Nuclear Reactor Regulations United States Nuclear Regulatory Costission Washington, D.C. 20555

Subject:

Abnomal Oce':rrence The following occurrence was reported to Mr. Walt Baunack,'

Region 1, Office of Inspectlen and Ihforcenent, United States Nuclear Regalatory Cordssion on Fcbraary 13, 1975 Written notification was nade to Mr. Jones P. O'Reilly, Office of Inspection nnd Enforcenent, Region 1, United States Nuclear Reguletory Cc:nission on Febmary 13, 1975 In accordance with Section 6.7 2.A of the Technical Specifications, Appendix A of DPR-hh for Unit 2 Peach Botto:a Atenic Power Station, the follcWing report is being subnitted to the Directorate of Reactor Licensing as nn Abnornal Occurrence.

Reference:

License Number DPR-hh Technical Specification

Reference:

h.7. A .2.f Report No.: 50-277-75-16 Report Date: Febmary 22, 1975 Occurrence Date: Febmary 12, 1975 Facility: Peach Botto:a Atomic Power Station R.D.1, Delta, Pennsylvania 1731h Identification of Occurrence:

Ocessive leakage of HPCI Turbine Fahaust Check Valve (23-65).

Conditions Prior to Occurrence:

Unit 2 chutdown for piping inspection. (IE Dalletin 75-1).

fb ' r n.,e.

8401270039 840222 PDR ADOCK 05000277

/d 2 t' o J S PDR COPY SENf REGION b

F. 3 Mr. A. Gir.mbusso ~s - a. I Febmary 22, 1975 (J O r c= 2 1

l Description of Occurrence:

During a routine local leak rate test, the HPCI Turbine Exhaust Check Valve, was found to leak in excess of 2000 cc/ min.

Designation of Apcarent Cause of Occurrence:

The check valve's failure to seal tightly was caused by minor -

surface imperfections in the disc and seat.

Analysis of Occurrence:

The safety implications of this occurrence are minimal since the inner turbino exhaust isolation stop check valve (23-12) closed and sealed satisfactorily.

Corrective Action:

The valve was disassembled, the disc machined and the seat lapped. The valve was satisfactorily leak tested and returned to servic e. ,

Fniluvo Dnt.n. .

None.

Very tmly yours,

/

M. '. Cooney Ass't Gen'1 Su erintendent Generation Division ,

cc: Mr. J. P. O'Reilly Director Office of Inspection and Enfomment Region 1 United States Nuclear Regulatory Cec: mission 631 Par:c Avenue

! King of Pmssia, PA 19h06 l

F L

.. . . _ . - . - _