ML20154H202

Forwards Metallurgical Lab Note 85-990, Metallurgical Analysis of 3A & 3C Wear Rings Removed from RHR Pump Impellers,Peach Bottom Unit 3, Per 851219 Meeting & NRC 860114 Request.No Crack Indications Noted for Unit 2

ML20154H202
Person / Time
Site:	Peach Bottom
Issue date:	03/06/1986
From:	Daltroff S PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Muller D Office of Nuclear Reactor Regulation
Shared Package
ML20154H206	List: ML20154H202 ML20154H221
References
NUDOCS 8603100211
Download: ML20154H202 (2)

Text

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t PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET l P.O. BOX 8699 PHILADELPHI A. PA.19101 sHitLos L. DALTRorr WNM*NI stsc n$c"e'nN$on March 6, 1986 Docket Nos. 50-277 50-278 Mr. Daniel R. Muller, Director BWR Project Directorate #2 Division of Boiling Water Reactor Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555

Subject:

Peach Bottom Atomic Power Station,

! Units 2 and 3, RHR pump wear ring cracks

Reference:

Summary of Meeting With Philadelphia Electric Company Concerning Shroud Head Bolt Cracks and RHR Wear Ring Cracks, Gerald E. Gears, NRC to Philadelphia Electric Company, dated January 14, 1986 Dear Mr. Muller l

l On December 19, 1985, representatives of Philadelphia j Electric Company met with the NRC staf f in Bethesda, Maryland to discuss, in part, intergranular stress corrosion cracking (IGSCC) of residual heat removal (RHR) pump wear rings. The NRC staf f l

requested that we present our findings concerning the IGSCC l cracks on the RHR pump wear rings. Detailed metallurgical l

examination of the Unit 3 'A' and 'C' RHR pump wear rings has been completed and the laboratory report is attached.

[ Since the meeting, the Unit 2 'B' RHR pump has been

! disassembled and inspected for cracked wear rings (on January 28, 1986). No crack indications were visually found. The impeller previously removed from the Unit 3 'A' RHR pump was installed in the Unit 2 'B' RHR pump with new impeller wear rings. The casing wear rings were replaced as well. This completes the installation of new wear rings in all eight of the Peach Bottom RHR pumps. [ [

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Mr. Daniql R. Muller, Director March 6, 1986

• Page 2 r-Details of the inspection of the other seven RHR pump wear rings were submitted to the Commission on January 15, 1986 in LER 3-85-20.

Should you have.any questions or require additional  ;

information, please do not hesitate to contact us.

i

, Very truly yours,

~.

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Attachment cc: Dr. T. E. Murley, Administrator, Region I, USNRC T. P. Johnson, Resident Site Inspector i

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