ML20236B051
| ML20236B051 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 10/21/1987 |
| From: | Tam P Office of Nuclear Reactor Regulation |
| To: | Sieber J DUQUESNE LIGHT CO. |
| References | |
| TAC-65107, NUDOCS 8710230311 | |
| Download: ML20236B051 (3) | |
Text
October 21, 1987 i
Docket No. 50-334 Mr. il. D. Sieber, Vice President l
l Duquesne Light Company Nuclear Operation Post Office Box 4-Shippingport, PA 15077
Dear Mr. Sieber:
SUBJECT:
BEAVER VALLEY UNIT 1 - REMOVAL OF LARGE-BORE SNUBBERS (TAC 65107) l By letter dated September.24, 1987, you responded to our request for additional information on the subject matter. We have reviewed your response and uncovered further information need (see enclosure).
Please respond to I
this request as soon as possible such that we have two weeks to complete this review. We understand that, upon NRC approval,'you plan to remove the snubbers in the upcoming refueling outage commencing in early December.
The reporting and/or recordkeeping requirements contained in this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.
Sincerely,
/s/
Peter S. Tam, Project Manager Project Directorate I-4
Enclosure:
As-stated cc w/ enclosure:
See next page DISTRIBUTION:
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Mr. J. D. Sieber Beaver Valley 1 Power Station l
Duquesne Light Company cC*
Mr. W. S. Lacey Pennsylvania Power Company Station Superintendent James R. Edgerly Duquesne Light Company Post Office Box 891 Beaver Valley Power Station New Castle, Pennsylvania 16103 Post Office Box 4 Shippingport, Pennsylvania 15007 Mr. W. F. Carmichael, Commissioner State of West Virginia Department Mr. Kenneth Grada, Manager of Labor Safety and Licensing 1800 Washington Street, East i
Duquesne Light Company Charleston, West Virginia 25305
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Post Office Box 4 I
Shippingport, Pennsylvania 15077 David K. Heydinger, M.D.
State Director of Health Mr. John A. Levin State Department of Health Public Utility Comission 1800 Washington Street East Post Office Box 3265 Charleston, West Virginia 25305 Harrisburg, / pennsylvania 17120 i
Regional Administrator, Region I Gerald Charnoff, Esquire U.S. Nuclear Regulatory Connission Jay E. Silberg, Esquire 631 Park Avenue Shaw, Pittman, Potts and Trowbridge King of Prussia, Pennsylvania 19406 2300 N Street, N.W.
Washington, DC 20037 Mr. R. Janati Bureau of Radiation Protection Charles. E. Thomas Esquire Pennys1vania Department of Thomas and Thomas Environmental Resources 212 Locust Street P.O. Box 2063 Box 999 Harrisburg, Pennsylvania 17120 Harrisburg, Pennsylvania 17108 John D. Burrows, P.E.
Marvin Fein Director of Utilities Utility Counsel State of Ohio City of Pittsburgh Public Utilities Connission 313 City-County Building 180 East Broad Street Pittsburg, Pennsylvania 15219 Columbus, Ohio 43266-0573 Resident Inspector Pennsylvania Office of Consumer U.S. Nuclear Regulatory Comission Advocate Post Office Box 298 ATTN: Michael Bardee Shippingport, Pennsylvania 15077 1425 Strawberry Square Harrisburg, Pennsylvania 17120 t
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-l REQUEST FOR ADDITIONAL INFORMATION ON ELIMINATION OF POSTULATED PRIMARY LOOP PIPE RUPTURES AS A DESIGN BASIS l
l DUQUESNE LIGHT COMPANY BEAVER VALLEY POWER STATION UNIT 1 DOCKET NO. 50-334 i
l (1).The staff has performed independent flaw stability computations based on i
elastic-plastic fracture mechanics (EPFM) procedures using data specific to Beaver Valley Unit 1 as provided by the licensee..However, the l
staff's results disagreed with those provided in Table 5-1 in WCAP-11317, Supplement 1,. relative to the-factor of 2 on the leakage flaw size. The licensee used the EPFM procedures in Reference 5.1 in WCAP-11317, Supplement 1.
The staff benchmarked the licensee's procedures with the staff's procedures in NUREG-1061, Volume 3, and concluded that the licensee's procedures resulted in higher-values of the crack driving force parameter " applied J" as compared with the staff's procedures.
However, the " applied J" values presented in the top half of Table 5-1 in
= WCAP-11317, Supplement 1 to demonstrate the factor of 2 on the leakage flaw size were less than those obtained by the staff. The licensee should verify the calculations and resubmit the " applied J" values used to demonstrate the factor of 2 on the leakage flaw size.
(2) In Section 3.0 in WCAP-11317, Supplement 1, the licensee stated that the average austenitic material properties were determined by multiplying the Code minimum values by a factor of 1.25.
The licensee should provide a brief justification for this estimation procedure.
Principal contributor:
Sanson Lee, reviewer i
I