ML20092D697

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Forwards Info Re Repair of Reactor Pressure Vessel Jet Pump Instrument Nozzle,Seals N8-A & N8-B.Info Includes Results of Ultrasonic Test & Fracture Mechanics & Nozzle Seal Safety Evaluations.Drawings Will Be Submitted in 30 Days
ML20092D697
Person / Time
Site: Peach Bottom Constellation icon.png
Issue date: 06/20/1984
From: Daltroff S
PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To: Eisenhut D
Office of Nuclear Reactor Regulation
Shared Package
ML20092D702 List:
References
GL-84-11, NUDOCS 8406220110
Download: ML20092D697 (4)


Text

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  • 7 PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET P.O BOX 8699 PHILADELPHI A. PA.19101
  • ]v E,s}.;a,.{[' June 20, 1984 Docket No. 50-278 Mr. Darrell G. Eisenhut, Director Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555

SUBJECT:

Repair to the Jet Pump Instrumentation Penetrations

Dear Mr. Eisenhut:

This letter and the enclosed attachments provide information related to the repair of the Peach Bottom Atomic Power-Station Unit 3 Reactor Pressure Vessel Jet Pump Instrument Nozzle Seals N8-A and N8-B, as discussed in a June 18, 1984, meeting with the NRC staff in Bethesda, Maryland.

Attachment A, " Ultrasonic Indications in the- Jet Pump Instrumentation Penetrations", contains the findings of ultrasonic examinations performed on the Peach Bottom Unit 3 Reactor Pressure Vessel Jet Pump Instrument Nozzle Seals N8-A and N8-B. These examinations were performed on Peach Bottom Unit 3 following the discovery of indications in one of the Jet Pump Instrument Nozzle Seals in Unit 2.

Attachment B, " General Electric Company's Fracture Mechanics Evaluation and Overlay Weld Repair Design", describes  ;

the analysis and overlay designs for dispositon of the welds with  ;

indications. The weld overlay design included within Attachment B was performed in accordance with the requirements described in '

Attachment 2 of Generic Letter 84-11.

In addition to-the weld overlay repair, both welds will 1 be instrumented with moisture sensing equipment prior to operation.

These moisture devices are identical to the leak detection devices described in Attachment G, " Identification of  ;

h 0 hg 3 PDR

c . o Mr. Darrell G. Eisenhut June 20, 1984 Page 2 Placement of Leak Detection Devices and Monitoring of These Devices to Assure Safe Operation of Plant", to the October 19, 1983 Peach Bottom Unit 2 Supplemental Response to I.E. Bulletin No. 83-02, S. L. Daltroff (PECo) to Dr. T. E. Murley (NRC) .

Attachment C, " Safety Evaluation for the Operation of Peach Bottom Atomic Power Station Unit 3", contains the safety evaluation for both Jet Pump Instrument Nozzle seals.

As discussed with the NRC staff, a detailed sketch of the Reactor Pressure Vessel Jet Pump Instrument Nozzle Seals N8-A and N8-B configurations and a report addressing the instrument tube spacer plate effect on residual stresses following the weld overlay will be submitted within 30 days.

Should you have any questions or require additional information, please do not hesitate to contact us.

Very truly yours,

  1. L$ -

Attachments cc: A. R. Blough, Site Inspector Dr. T. E. Murley, Administrator I _

1 PHILADELPHIA ELECTRIC COMPANY PEACH BOTTOM UNIT #3 REPAIR TO THE JET PUMP INSTRUMENTATION PENETRATIONS June 1983 TABLE OF CONTENTS ATTACHMENT A Ultrasonic Indications in the Jet Pump Instrumentation Penetrations of Peach Bottom Atomic Power Station Unit 3 ATTACHMENT B General Electric Company's Fracture Mechanics Evaluation and Overlay Weld Repair DeEign ATTACHMENT C Safety Evaluation for the Operation of Peach Bottom Atomic Power Station Unit 3 9

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Q PilILADELPilIA ELECTRIC COMPANY PEACil BOTTOM UNIT #3 REPAIR TO Tile JET PUMP INSTRUMENTATION PENETRATIONS 9

June 1983 TABLE OF CONTENTS ATTACllMENT A Ultrasonic Indications in the Jet Pump Instrumentation Penetrations of Peach Bottom Atomic Power Station Unit 3 ATTACllMENT U General Electric Jompany's Fracture Mechanics Evaluation and Overlay Wold.

Repair Design ATTACliMENT C Safety Evaluation for the Operation of Poach Bottom Atomic Power Station Unit 3 1

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