ML18031A171

Notifies of Plans to Replace Reactor Pressure Vessel Recirculation Nozzle safe-end & Thermal Sleeves.Mod Aimed at Increasing Reliability & Protection Against Interganular Stress Corrosion Cracking

ML18031A171
Person / Time
Site:	Susquehanna
Issue date:	05/04/1979
From:	Curtis N PENNSYLVANIA POWER & LIGHT CO.
To:	Parr O Office of Nuclear Reactor Regulation
References
PLA-350, NUDOCS 7905090346
Download: ML18031A171 (4)

Text

REGULATORY I" ORMiATION DISTRIBUTION SYST (RIDS)

ACCESSION NBft:7905090346 DOC ~ DATE: 79/05/04 NOTARIZED NO DOCKET FACI QUEHANNA STEAM ELECTRIC STATION ~

UNIT 1

g PENNSYI VA 05000387 50 388

'EHANNA STEAM ELECTRIC STATION ~

UNIT 2e PENNSYLVA 05000388 AU

~

AUTHOR AFFILIATION CURTIS, IN,W, PENiVSYLVANI A POWER 8

LIGHT CO ~

REC IP. NAME RECIPIENT AFF ILIATION PARREO ~ DE LIGHT WATER REACTORS BRANCH 3

SUBJECT:

NOTIFIES OF PLANS TO REPLACE REACTOR PRESSURE VESSEL RECIRCULATIOV NOZZEL SAFE EhlD 8

THERMAL SLEEVES ~ MOD AIMED AT IiVCREASIIVG REL, IABILITY 8 PROTECTION AGA INST IiVTERGANULAR STRESS CORROSION CRACK ING ~

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18101 PHONEME (215) 821-5151 ve'1979 Mr. Olan D, Parr, Chief Light Water Reactors Branch No.

3 Division of Project Management U. S. Nuclear Regulatory Commission Washington, D.

C.

20555 Docket Nos.

50-387 50-388 SUSQUEHANNA STEAM ELECTRIC STATION RECIRCULATION RISER PIPING MODIFICATIONS FOR IGSCC ER 100450 FILE 883 PLA-350

Dear Mr,

Parr:

For your information Pennsylvania Power and Light Company is planning to replace the Reactor Pressure Vessel (RPV) Recirculation Nozzle Safe End and Thermal Sleeves on Unit ¹1 and ¹2. This replacement is in keeping with our previous design modifications aimed at increasing reliability and protection against Intergranular Stress Corrosion Cracking (IGSCC). This is a supplement to our previous documents PLA-291 and PLA-139.

A modified design of the thermal sleeve on the reactor recirculation piping inlet to the vessel has been proposed by General Electric NEBG and PPhL has elected to incorporate this change into the Susquehanna design.

This change in design is basically an effort to provide a

geometry which is more optimized for resistance to IGSCC.

The attached sketches provide outlines of the old and new designs (Figure 1).

The changes will be accomplished in accordance with ASME Section XI, 1974 Edition with addenda to and including the summer 1975 paragraph IWA-4100. The additional ASME codes used for this modification are:

(A)

Section III, 1974 Edition including Summer 1976 Addenda (B)

Section IX, 1974 Edition including Summer 1976 Addenda (C)

Section V, 1974 Edition including Summer 1976 Addenda All welders and welding operators will be qualified in accordance with the requirements of the ASME code.

Appropriate procedures will be written for this installation. Unit ¹1 and ¹2 material for the replacement of safe ends and thermal sleeves will be Type 316L.

If you have any questions, please contact us.

Very truly yours, N.

W. Curtis Vice President-Engineering and Construction CTC/thm CC:

Bob Gallo NRC PENNSYLVANIA POWER 8

LIGHT COMPANY

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