ML20137Y043
| ML20137Y043 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse, Oconee, Arkansas Nuclear, Crystal River, Rancho Seco, Midland, Bellefonte, 05000000, Washington Public Power Supply System |
| Issue date: | 02/18/1986 |
| From: | Stolz J Office of Nuclear Reactor Regulation |
| To: | Wilgus W FLORIDA POWER CORP. |
| Shared Package | |
| ML20137Y048 | List: |
| References | |
| RTR-REGGD-01.045, RTR-REGGD-1.045 GL-84-04, GL-84-4, NUDOCS 8603120103 | |
| Download: ML20137Y043 (3) | |
Text
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Fcbruary 18, 1986 Docket No. 50-302 Mr. Walter S. Wilgus Vice President, Nuclear Operations Florida Power Corporation ATTN: Manager, Nuclear Licensing
& Fuel Management P. O. Box 14042; M.A.C. H-3 St. Petersburg, Florida 33733
Dear Mr. Wilgus:
SUBJECT:
SAFETY EVALVATION OF B&W OWNERS GROUP REPORTS DEALING WITH ELIMINATION OF POSTULATED PIPE BREAKS IN PWR PRIMARY NAIN LOOPS Re:
Crystal River Unit No. 3 Nuclear Generating Plant The NRC staff has reviewed the B&W Owners Group reports BAW-1847 Rev.1, and BAW-1889P which apply " leak-before-break" technoloqy as an alternative to designing against dynamic loads associated with postulated ruptures of primary coolant loop piping. As discussed in the enclosed letter to the BAW Owners Group, we have concluded that an acceptable technical basis has been provided to eliminate, as a design basis, the dynamic effects of large ruptures in the main loop piping of those B&W Owners Group facilities listed in the enclosure. Authorization by the NRC to not provide protection against the dynamic loads resulting from postulated breaks of prim:rj main loop piping will require an exemption from General Design Criterion 4 (GDC4).
Such exemptions must be justified on a facility specific basis. Each request for an exemption should include a safety balance in accordance with the guidance provided in NRC Generic Letter 84-04, " Safety Evaluation of Westinghouse Topical Reports Dealing With Elimination of Postulated Pipe Breaks in PWR Primary Main Loops," February 1,1984 In addition, information for each facility should be submitted to demonstrate that leakane detection systems installed at the facility comply with Regulatory Guide 1.45.
Generic Letter 84-04 inforned all operating PWR licensens, construction permit holders and applicants for construction permits of the staff's intent to proceed with rulemaking changes to GDC-4 to permit the use of analyses that demonstrate the probability of rupturing piping is extremely low under design basis conditions. On July 1,1985, the Comission published a proposed modification to GDC-4 which would permit the use of such analyses for PWR primary coolant loop piping.
The NRC staff is currently in the l
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Mr. Wilgus process of final rulemaking.
Promulgation of the final rule will eliminate the need for exemption requests and performance of safety balances; however, the requested information on leakage detection systems should be submitted.
Sincerely,
" UssGl.' G ;;; g SM Ee ChyQe John F. Stolz, Director PWR Project Directorate #6 Division of PWR Licensing-B
Enclosure:
As Stated cc w/ enclosure:
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I Mr. W. S. Wilgus Crystal River Unit No. 3 Nuclear l
l Florida Power Corporation Generating Plant cc:
Mr. R. W. Neiser State Planning and Development Senior Vice President Clearninghouse and General Counsel Office of Planning and Budget Florida Power Corporation Executive Office of the Governor P. 0. Box 14042 The Capitol Building St Petersburg, Florida 33733 Tallahassee, Florida 32301 Nuclear Plant Manager Mr. Wilbur Langely, Chairman Florida Power Corporation Board of County Comissioners P. O. Box 219 Citrus County l
Crystal River, Florida 32629 Inverness, Florida 36250 i
Mr. Robert B. Borsum Babcock 8 Wilcox Nuclear Power Generation Division Suite 220, 7910 Woodmont Avenue l
Bethesda; Maryland 20814 Resident inspector U.S. Nuclear Regulatory Comission Route #3, Box 717 Crystal River, Florida 3?629 Regional Administrator, Revion !!
U.S. Nuclear Regulatory Comission i
101 Marietta Street, Suite 3100 L
Atlanta, Georgia 30303 Mr. Allan Schubert, Manager i
l Public Health Physicist Department of Health and Rehabilitative Services 1323 Winewood Blvd.
Tallahassee, Florida 32301 i
Administrator Department of Environmental Regulation Power Plant Siting Section State of Florida 2600 Blair Stone Road l
Tallahassee, Florida 32301 L
Attorney General Department of Legal Affairs
(
The Capitol Tallahassee, Florida 32304 i
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