ML20199B218

Forwards Request for Addl Info Re Jet Pump Riser Cracking for Peach Bottom Atomic Power Station,Unit 3

ML20199B218
Person / Time
Site:	Peach Bottom
Issue date:	11/07/1997
From:	Padovan L NRC (Affiliation Not Assigned)
To:	Hunger G PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
References
TAC-M99832, NUDOCS 9711180247
Download: ML20199B218 (4)

Text

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November.7.-1997-Mr. George A. Hunger, Jr.

Director-Licensing, MC 62A-1 PECO Energy Company '

Nuclear Group Headquarters Correspondence Control Desk

~ P.O. : Box No.195 Wayne, PA 19037-0195

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION ON JET PUMP RISER CRACKING, PEACH ,-

BOTTOM ATOMIC POWER STATION, UNIT 3 (TAC NO. M99832)

Dear Mr. Hunger:

4 We developed the enclosed request for additional information (RAI) during our review of your jet pump weld indication 10 CFR 50.59 analysis-transmitted to us in your October 30, 1997, _ letter, j Please provide your response to us within 15 days of the date of this letter.

.Please contact me at (301) 415-1423 if you have any questions.

Sincerely,

/s/-

L. Mark Padovan, Project Manager Project Directorate I-2 Division of Reactor Projects - I/II '

Office of Nuclear Reactor Regulation Docket No. 50-278 Enclosiire: M'.

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Mr. George A. liunger, Jr.

Director-Licensing, MC 62A-l' PECO Energy Company Nuclear Group liendquarters Correspondence Control Desk P.O. Box No. 195 Wayne, PA 19087-0195

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION ON JET PUMP RISER CRACKING, PEACH BOTTOM ATOMIC POWER STATION, UNIT 3_(TAC NO. M99832)

Dear Mr. Hunger:

We developed the enclosed request for additional information (RAI) during our review of your jet pump weld indication 10 CFR 50.59 analysis transmitted to us in your October 30, 1997, letter.

Please provide your response to us within 15 days of the date of this letter.

Please contact me at (301) 415-1423 if you have any questions.

S ncerely, C 6, -

L. ar adovan, P j t Manager P oject Directorate I-2 ivision of Reactor Projects - I/II Office of Nuclear Reactor Regulation Docket No. 50-278

Enclosure:

RAI cc w/ enc 1: See next page

Mr. George A. Hunger, Jr. Peach Botton Atomic Power Station,

. PECO Energy Company Units 2 and 3 CC:

J. W. Durham, Sr., Esquire Chief-Division of Nuclear Safety Sr. V.P. & General Counsel PA Dept. of PECO Energy Company Environmental Resources -

'2301 Market Street, S26-1 P.O. Box 8469 Philadelphia, PA 19101 Harrisburg, PA 17105-8469 PECO Energy Company ATTN: Mr. T. N. Mitchell, Vice President Board of Supervisors Peach Botton Atomic Power Station Peach Botton Township 1848 Lay Road R. D. #1 Delta, PA 17314 Delta, PA 17314 PECO Energy Company Public Service Comission of Maryland ATTN: Regulatory Engineer, A4-5S Engineering Division Peach Bottom Atomic Power Station Chief Engineer 1848 Lay Road 6 St. Paul Centre Delta, PA 17314 Baltimore, MD 21202-6806 Resident Inspector Mr. Richard McLean U.S. Nuclear Regulatory Commission Power Plant and Environmental Peach Bottom Atomic Power Station Review Division P.O. Box 399 Department of Natural Resources Delta, PA 17314 B-3, Tawes State Office Building Annapolis, MD 21401 Regional Administrator, Region I U.S. Nuclear Regulatory Commission Dr. Judith Johnsrud 475 Allendale Road National Energy Committee King of Prussia, PA 19406 Sierra Club 433 Orlando Avenue Mr. Roland Fletcher State College, PA 16803 Department of Environment 201 West Preston Street Manager-Business & Co-owner Affairs Baltimore, MD 21201 Public Service Electric and Gas Company A. F. Kirby, 111 P.O. Box 236 External Operations - Nuclear Hancocks Bridge, NJ 08038-0236 Delmarva Power & Light Company P.O. Box 231 Wilmington, DE 19899 Manager-Peach Bottom Licensing PECO Energy Company PECO Energy Company Nuclear Group Headquarters Plant Manager Correspondence Control Desk '

Peach Bottom Atomic Power Station P.O. Dox No. 195 1848 Lay Road Wayne, PA 19087-0195 Delta, PA 17314

L, Reauest for Additional Information i Peach Bottom Atomic Power Station. Unit 3 Jet Pumo Riser Weld Crackino Please provide the following information: .

To perform an adequate assessment of the jet pump cracking for Peach Bottom Unit 3, the staff needs the following information.

(1) Provide the test data establishing the oK threshold. For each subgroup of the test data corresponding to a specific testing program, provide the associated AK and K values, and verify whether the test was conducted _in the boiling water reactor environment (temperature, chemistry,etc.). Provide sample oK and K values for the longest crack found in the jet pump subjected to flow-induced vibrations under normal operating conditions, and justify the use of the oK threshold to the current crsck growth evaluation.

(2) Explain the simplified finite element model (FEM) which simulates the cracked jet pump. Also, provide the criteria that were used to establish the-equivalence of the simplified model to the full FEM for the tracked jet pump. Confirm that the simplified model has considered the 13-inch long crack.

(3) Provide information, preferably from test, regarding the relationship among the stresses used in your stress intensity factor calculations, jet pump flow rate, and the percent of rated power.

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