ML20009E007
| ML20009E007 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 07/17/1981 |
| From: | Tedesco R Office of Nuclear Reactor Regulation |
| To: | Parris H TENNESSEE VALLEY AUTHORITY |
| References | |
| NUDOCS 8107240578 | |
| Download: ML20009E007 (4) | |
Text
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Docket No. 50-328
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fir. H. G. Parris
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500A Chestnut Street, Tower 11 c,
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Dear Hr. Parris*
SUBJECT:
IhSPECTION AnD TESTING OF ShuBBERS Due to the safety significance of inoperable snubbers in safety-related systeu, the HRC has determined that a preservice/preoperational inspection and testing pro v m for snubbers shall be a part of the licensing process. The intent of this,)rogram is to assure the correct installation and operability of the snubbers which have been exposed to construction activitiy and environment. In that Sequoyah Unit 2 has essentially completed preoperational testing, this letter describes a modified progran relative to tne inspection and testing program issued to all applicants entitled "Preservice Inspection and Testing of Snubbers". This uodified program will provide reasonabic confidence that tiie safety-related snubbe-s in Sequoyah Unit 2 remain operable subsequent +,o completion of constru; tion activity.
It is requested that you perform an inspection and testing program on Sequoyah Jnit '2 snubbers as follows.
1.
Manual testing of snubbers to be completed prior to plant neatup after initial fuel loading:
Select a sample of mechanical snubbers composed of 10% of the installed a.
Model PSA 1/4,10% of the installed Model PSA 1/2 and 10% of the
-installed Model PSA 1.
b.
Perform a nanual stroke test on tne above sample over the full range of travel to verify freedom of movement.
If greater than one inoperable snubber is icentified in the initial saaple, select a lot sizer equal to one-half of the initial sample for each failed snubber in excess of tne one allowed failure and continue testing in f
accordance with.the requirements of Technical Specification 3/4.7.9.f. The models specified for the initial sample are those nost likely to sustain damage from physical abuse. The sampling methodology is based on the Sequoyah Unit 2 Technical Specification. The initial sample should be selected from those areas of tne plant where the snubbers would be most susceptible to dacage from construction activity and environme..c.
nhearvaHnn nf snu%or c.ovment dt rino olant heatim but nrior to initial 9
critical i ty.
OFFICE)
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8107240578 810717 PDR ADOCK O5000328 c4rE P
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Tennessee Valley Authority 2
For those snubbers expected to have observable movement during the plant heatup:
a.
Verify the freedom of novement for all of those snubbers which are accessible without the use of scaffolding.
b.
Verify freedom of novemes for 10% of those snubbers which are not accessible without scaffuloing.
E.
Exemptions Snubbers for which the freedom of movement has been demonstrated and documented within the last 12 nonths are exerapted from the above program.
Sincerely, N daned by atabet A nsgese, Robert L. Tedesco, Assistant Director for Licensing
.Division of Licensing cc w/ encl:
H. J.' Green, Divisien Director G. G. Stack, Project llanager J. M. Ballentine, Plant Superintendent J. F. Cox,1 Supervisor, Nuclear Licensing Section H. J. Burzynski, Project Engineer H. N. Culver, Chief. Nuclear Safety RevipwStaff blind 2I4-bec w/ehcl:
NRC Resident Inspector
- Central l Files Local Public Document Roon Washington Public Document Room Nuclear Safety Infomation Center Technical Information Center Document Management Branch State of Tennessee r
- See previous white
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a Tennessee Valley Authority 2
X For those snu6bers expected to have observable movemnt during the plant heatup:
a.
Verify the freedom of novement for all of tnose snubbers which are accessible without the use of scaffolding.
b.
Verify freedom of movement for 1D% of those snubbers which are not accessible without scaffolding.
E.
Exemptions snubbers for whico the free om of movement has been demostrated and documented within the la.it 12' months are exempted froa the above program.
x$1nceraly, N
x Robert L. Tedeico, Assistant Director for Li:'ensing N
Division of Licensirigs
'N DISTRIBUTION cc w/ enc 1:
Docket File H. J. Green, Division Director LB#4 Reading G. G. - Stack, Project flanager DEisenhut J. it.- Ballentine, Plant EAdensam Superinter "qt CStahle J. F. Cox, Superviscr, Nuclear MDuncan Licensing Section SHanauer-H. J. Burzynski, Project E.ngineer RTedesco li. N. Culver, Chief. Nuclear Safety RVollmer Review Staff j
TMurley RMattson blind 2 4 bec w/ encl:
RHartfiald, MPA OELD NRC Resident Inspector.
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Central Files bec: TERA Local Public Docuw nt Room NSIC/ TIC Wa:hington Public Document Roon LocalPD3 Nuclear Safety Infc.mation. Center
,NRC/PDR i Technical Information Center Document itanagement Branch State of Tennessee
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SEQUOYAH Mr. H. G. Parris Manager of Power Tennessee Valley Authority 500A Chestnut Street, Tower II-Chattanooga, Tennessee 37401 cc: Herbert S. Sanger, Jr., Esq.
General Counsel
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Tennessee Valley Authority 400 Commerce Avenue E 11B 33 Knoxville, Tennessee 37902 Mr. H. N. Culver Tennessee Valley Authority 400 Commerce Avenue, 249A HBB Knoxville, Tennessee 37902 Mr. Bob Faas Westinghouse Electric Corp.
P.O. Box 355 Pittsburgh, Pennsylvania 15230 Mr. Mark Burzynski Tennessee Valley Authority
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400 Chestnut Street. Tower II Chattanooga, Tennessee 37401 Mr. J. F. Cox Tennessee Valley Authority 400 Commerce Avenue, W10C131C Knoxville, Tennessee 37902 Resident Inspector /Sequoyah NPS c/o U.S. Nuclear Regulatory Commission 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379
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