ML18283B726
| ML18283B726 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 11/14/1975 |
| From: | Purple R Office of Nuclear Reactor Regulation |
| To: | Watson J Tennessee Valley Authority |
| References | |
| Download: ML18283B726 (20) | |
Text
PCollins SVarga CHebron AESteen ACRS (16)
OELD OltrE (3}
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LRubenstein DRoss VSt'ello 80c4l" ~4 Docket Nos.
50-259 arrd 50-260 Tennossee Valloy Authority ATPt:
Mr. Jamos E. Natson Manager of Power 818 Powor Buildin'g Chattanooga, Tennessee 37201 DISTRIBUTION, Docket Files(2)
NRC PDRs (2)
NOy g,'g ]g7g ORB¹l Reading Local "PDR" TBAbernathy, TIC KRGoller JMcGough TJCarter RAPurple TVtfambach SMSheppard DEisenhut SVarga BJones (8)
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JSaltzman The Commission has issued the onclosod Amondmonts No. 1 V hand ~ 4 to Facility Licenses No.
DPR-33 and. DPR-S2 for the Browns Ferry Nuclear Plant, Units 1 and 2.
Theso amendments aro in response to your request of November 5, 1975, for authorization to plug the bypass flow holes in tho lower coro support plato and drill holes in the fuol assembly lowor tio platos.
Tho amondments authorize the p1ugging modification but do not authorize the drilling of tho fuel assembly lower tie plates nor operation under-any condi.tion.
These latter items are sti.ll under review and will bo the subject of another liconsing acti.on..
Copies of the Safety Evaluation and tho Federal Rogi.ster Notice-related to the present amendments are also enclosed.
Sincerely, Original signed bg 3, A, Purylo Robert A. Purple, Chief
- Oporating Reactors Branch ¹1 Division of Reactor Licensing
Enclosures:
1.
Amendment No. I V to DPR.-33 2.
Amondmont No.i 4 to DPR-S2 3.
Safety Evaluati.on 4.
Federal Rogistor Notice cc w/enclosures:
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Tennessee Valley Authority CC w/enclosures:
Robert H. Marquis General Counsel 629 New Sprankle'uilding Knoxville, Tennessee 37919 Athens Public Library South and Forrest
- Athens, Alabama 35611 Mr. Thomas Lee Hammons
- Chairman, Limestone County Board of Revenue
- Athens, Alabama 35611 cc w/enclosures and incoming:
Ira L. Myers, M.D.
State Health Officer State Department of Public Health State Office Building Montgomery, Alabama 36104 Mr. Dave Hopkins Environmental Protection Agency 1421 Peachtree
- Street, NE.
Atlanta, Georgia 30309
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~ I 4 TENNESSEE VALLFY AUTHORITY DOCKET NO. 50-259 BR018JS FERRY NUCLEAR PLANT UNIT 1 AhPNDNBNT TO FACILITY OPBRATING LICENSE Amendmont>'No.l V
License No. DPR-33 1.
The Nucloar Regulatory Commission (the Commission) has found that:
A.
The application for amendment by Tennessoo Valley Authority (the licensee) dated November 5, 1975, complies with the standards and'requirements of tho Atomic Bnorgy Act of 1954, as amendod (tho Act), and the Commission's rules and regula-tions set forth in 10 CFR Chapter I; 8.
The facility will operate in conformity with the application, the provisions of the Act, and the rules and xogulations of the Commission; C.
Theeo is reasonable assurance (1) that tho activities authorized by this amendmont can be conducted without endangering the health and safoty of the public, and (ii) that such acti-vities will be conducted in complianco with tho Commission's regulations; and D.
Tho issuance of this amendment will not bo inimical to the colon dofenso and security or to the health and safety of the public.
2.
Accordingly, add Raragraph 2.C.(5) to Facility Liconso No. DPR-33 to road as follows:
"2.C.(5)
The facility may bo modified by plugging the bypass flow holes in tho lower coro support plato as described in Browns Ferry Nuclear Plant Units 1 and 2 Safety Analysis Report
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WJ for Plant Modifications to Eliminate Significhnt In-Core Vibrations PlEDC-21091),
October 1975.
The reactor shall not bo oporatod with the plugs installed in the lower core support plato bypass flow holes without further authorization by tho NRC."
3.
This liconso amendmcnt is effoctivo as of the date of its issuance.
FOR THE NUCLEAR REGUlATORY COMHSSION Dato of Issuance:
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p1'Jginnl signed by.
{B.A.Purple ~
Robert A. Purple, Chief Operating Reactors Branch Pl Division of Reactor Licensing I
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sI TENNESSEE VALLFY AUTHORITY DOCKET NO. 50-260 BRONNS FHRRY NUCLEAR PLANT UNIT 2 PMNDbfBNT TO FACILITY OPERATING LICENSE II Amendment hfo. i 4 License No. DPR-52 1.
The Nuclear Regulatory Commission (tho Commission) has found that:
A.
Tho application for amendment by Tennessee Valley Authority (the licensee) dated Novembor 5, 1975, complies with tho standards and requirements of the Atomic Energy Act of 1954, as amended (the Act), and the Commission's rules and regula-tions set forth in 10 CFR Chaptor I; B.
The facilitywill oporate'n conformity with the application, the provisions of the Act, ancl the rules and regulations of tho Commission; C.'here is reasonable assurance (i) that the activitios authorized by this amondmont can bo'onducted without endangering tho health and.safety of the public, and (ii) that such acti-vities will be conductod in compliance with the Commission's regulations; and D.
Tho issuance of this amendmnnt will not be inimical to the common dofonso and security or to tho health and,safety of tho public.
2.
Accordingly, add Paragraph 2.C.(5) to Facility License No. DPR-52 to read as follows:
"2.C.(5)
Tho facility may be modified by plugging the bypass flow holes in the lower core support plate as doscribed in Drowns Ferry Nucloar Plant Units 1 and 2 Safety Analysis Roport.
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for Plant Modifications to Eliminato Significant In-Coro Vibrations PJEDC-21091),
October 1975.
Tho reactor shall not bo oporatod with the plugs installed in tho lowor coro support plate bypass flow holes without further authorization by tho NRC."
'S.
This licenso amendmont is effoctivo as of tho date of its issuance.
FOR THE NUCLEAR REGULATORY COhNISSION D'ato of Issuance:
za 1975 Prlginnl signed bg R. A. Puzzle Robert A. Purple, Chiof Opeatting Reactors Branch 81 Division of Reactor Licensing OPPIOEW SURNAME&
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D.
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20555 SAFETY 'EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION SUPPORTING AlIENDtKNT NO. I V TO FACILITY OPERATING LICENSE NO.
DPR-33 AND AMENDMENT NO. I 4 TO FACILITY OPERATING LICENSE NO.
DPR-52 BROWS FERRY NUCLEAR PLANT UNITS 1 AND 2 TENNESSEE VALLEY AUTHORITY DOCKET NOS.
50-259 AND 50-260 Introduction By letter dated November 5,
- 1975, Tennessee Valley Authority (TVA) submitted a safety analysis in support of proposed plant modifications to eliminate in-core vibrations at Browns Ferry Nuclear Plant (BFNP) Units 1 and 2.
Although TVA concluded that the proposed modifications did not involve an unreviewed safety question, they requested that, if the Nuclear Regulatory Commission (NRC) disagreed, the submittal be considered as an application for amendment to Facility Operating License Nos.
DPR-33 and DPR-52 for the BFNP Units 1 and 2.
Discussion The submittal proposed plant modifications which consisted of plugging the bypass flow holes in the lower core support plate and drilling holes in the fuel assembly lower tie plates.
- However, due to a delay in the availability of the required drilling equipment, full implementation of the proposed modifications has also been delayed.
Since the plugging modification is scheduled for november 15, 1975, this amendment to authorize plugging only is being taken at this time.
The drilling of
'oles in the fuel assembly lower tie plates, and operating of the facility with plugged holes in the lower core support plate and drilled holes in the fuel assembly lower tie plates, is still under review.
Evaluation The plug consists of five basic parts, as shown in Figure l.
Identical plugs have previously been installed at Vermont Yankee, Pilgrim, Cooper, and Duane Arnold.
The body provides a means of guiding the device into the bypass flow holes as well as a shoulder to support the plug and form a seal against water flow.
The shaft extends through the body.
A knob is provided at the top of the shaft to provide a means of grabbing the plug during installation and extraction.
At the bottom, the latch is attached to the shaft by a pin.
The latch is free to rotate during'nstallation.
The spring acts against, the body and shaft during normal operation to provide the force necessary to offset the pressure differ-ential acting on the body.
During installation, the plug has its latch rotated 90 degrees from its installed position and withdrawn and locked in the body.. The shaft is gripped by the installation tool, and the plug is inserted into the bypass flow holes.
The body engages the rim of the hole.
The shaft is pushed to its full extension, thus lowering and unlocking the latch below the underside of the core plate.
The latch then rotates 90 degrees and bears on the bottom of the core plate.
After insertion, the plug is pulled with about 30-pound force to test the placement.
All fuel has been removed from Units 1 and 2.
Therefore,'.the plugging operation involves no risk of fuel assembly damage and fission product release.
The plug can be removed by gripping the top of the shaft with an extracting tool and applying a force of about 500 pounds.
The latch's legs will be plastically deformed and the entire plug withdrawn.
The plugs pre-viously installed, at Vermont'Yankee were removed with no abnormalities or loose pieces reported.
The force required for removal varied from 500 to 1300 pounds.
Based on a review of the design, the installation methods and the pre-viously successful operating experience't Vermont Yankee, Pilgrim, and Duane Arnold, we conclude that the plugs can be installed without damage to core components, that they will not fail during operation so as to result in loose parts in the core or result in unplugging of the bypass flow holes, and that they can be removed, if necessary, without damage to core components.
The modification is thus reversible.
Accordingly, we conclude that the installation of the plugs is acceptable.
The present license amendments, which authorize plugging of the core lower support plate bypass holes, do not authorize operation of the facility with these holes plugged.
Such operation is not presently intended by the licensee and would be the subject of a separate licensing action if such operation is proposed.
It is presently TVA's intention to complete the drilling modification, subsequent to our approval, prior to return to operation.
This modification also will be the subject, of a separate licensing action.
Conclusion Ne have concluded, based on the considerations discussed above, that:
(1) because the modification does not involve a significant increase in the probability or consequences of accidents previously considered and does not involve a significant decrease in a safety margin, the modification does not involve a significant hazards consideration, (2) there is reasonable assurance that the health and safety of the public will not be endangered by modification of the facility in the proposed
- manner, and (3) such activities will be conducted in compliance with the Commission's regulations and the issuance of these amendments will not be inimical to the common defense and security or to the health and safety of the public.
NOV 14 1975
r Safety Evaluation Supporting Anendments
!No. l V. and 1 4 to Facility Operating Licenses DPR-33 and DPR-52 Date: +y yg g75 SHAFT g ~
SPRING BODY CORE SUPPORT PLATE BOTTOM LATCH
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FIGURE l Pl<<g Installed in Core SUpport Plate
'UNITED STATES NUCLEAR REGULATORY COMMISSION DOCKET NOS.
50-259 AND 50-260 TENNESSEE VALLEY AUTHORITY NOTICE OF ISSUANCE OF AMENDMENTS TO FACILITY OPERATING LICENSES Notice is hereby given that the U.S. Nuclear Regulatory Commission (the Commission) has issued Amendment go. 1 V to Facility Operating License No.
DPR-33 and Amendment>No.g. 4 to Facility Operating License No.
DPR-52 issued to Tennessee Valley Authority for operation of the j
Browns Ferry Nuclear Plant, Units 1 and 2, located in Limestone County, Alabama.
The amendments are. effective as of the date of issuance.
The amendments authorize the plugging of the bypass flow holes in the lower core support plate.
The amendments do not authorize operation of the plant which will be the subject of another'icensing action.
The application for these amendments complies with the standards and requirements of the Atomic Energy Act of 1954, as amended (the Act),
and the Commission's rules and regulations.
The Commission has made appropriate findings as required by'the Act and the Commission's rules and regulations in 10 CFR Chapter I, which are set forth in the license amendments.
Prior public notice of these amendments is not required since the amendments do not involve a significant hazards consideration.
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For further details with respect to this action, soe (1) tho appli-cation for amondments dated November 5,. 1975, (2) Amendment lNo. X V to "
License No. DPR-33 and Amendment'No.l 4 to Licenso No. DPR-S2; and (3) thd Commission's related Safety Evaluation.
All of these items are available for public inspection at the Commission's pubfio Document'oom, 1717 H
- Street, NW., Washington, D.C., and at the Athens Public Library, South and Forrest,
- Athens, Alabama 35611.
A copy of items (2) and (3) may be obtained upon r'equest addressed to the U.S. Nuclear Regulatory Commission, Washington, D.C.
- 20555, Attention:
Diroctor, Division of Reactor Licensing Dated at Bethesda, Maryland, this FOR THE NUCLEAR REGULATORY COiI911SSION Original 81gned bF, Q, A.Purylo Robert A. Purple, Chief Operating Reactors Branch 01 Division of Reactor Licensing OCCICC~
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