ML17338B156

Responds to IE Bulletin 79-14 Seismic Analysis for As- Built Safety-Related Piping Sys. Two Noncompliances Found After Insp.Renews Request for Extension of Insp Schedule. Next Status Rept Will Be Submitted by 791115

ML17338B156
Person / Time
Site:	Turkey Point
Issue date:	09/26/1979
From:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
L-79-273, NUDOCS 7910100048
Download: ML17338B156 (6)

Text

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u 79-14. (F.pi mi wm'r) ~~~~) r 9P~N Viol isa Pelfer 5 Lij4~ Cm>ra::y subftiis this le'=ter for Turkey Point t;.nits 3 ind 4 H response tc the ss~biec". Ballet;ift. Iflspect.]cfls, subseqrfent. eyalua~ioffs, an.'eef'.alysis (if req~-'.red} are Ls'ing perforlfled for Turkey Poif . usia

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J axles P: O'Pail ly, Director., Region Il PngR 2 The desi 9A se st'fc response i spcctr'a for Tur 1;Qy Po if)t Unit s 3 Ad 4 i s e)",tr ci1elv 1&.>, but hi>s bien conservativel!r azpl i fied by a ac'.or of three

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inaxiraun earthquake piping r esponse. This conserv tive a-proach ce~binef for'i~e

>lith the Use of .5%i dampening provides for an ultra-con -"r'active ana)ysis sr'~en coripared to present techniques.

'the Turkey Po)nt Plant has been safely operating fot at. least five years. under normal operating loads and the contr ibg" ion of seismic loads is small in CQnparison.. lt ls highly ispr obable that 8 significant, ear ~hquake '.(auld occur, before completion of the inspection. Prel ieinary results of a probabflistic acceleration study by our A/E support this posi'ion. 1f, during the rmaining, evaluations, a>>y non>>confdrvences are identified i'hich s<.uld affect sys:m operability, ti:ey v'ill be corrected in a"cordance with the Technical Specific@ ions.

Thus, the probability cf a seismic event dvring +he period of the re~>>ested exte'nsion is extremely s~all. Eut"t;her, or.o, it. is our -udge~nent. that should a is'Sic OY "t occur) f4 ~ho p>~

~ ~'11 ) tp' hat cl its t6.". rIcc";ssar)' v7" 8 5816 cbQbi shu".down of'he plant would faH to opere.:e is also e~tr<<mely sna11. Fcr these reasons Fl Ql ida POHBl 8 Li9ht Cca)pand 1 a conclu(ed ha" Qgcf 0 i'3n du<In~ the period of the requested extension ~i11 not pose a threa'o the b.o.alth anrj safe y'f'e publ 'ic p and k'Iat 1 I ttl 6 addi t ional benef i p i derived irto an earlier irspection. On the other hound, si".n i'icant cos's ~rHl f ny 7 sri 1 be ircut red by our custori>ebs during t'.)e add) ~ion)1.shv>doe ~er~ads requir8 only for an ear ) ier'nscechfon. T!ipse costs were discusse" in our letter of August 2. subunit

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'or the reasons given in this letter, Florida Power 8 Ligh".. O'G~pzny has concluded that an. exte~>Cion is 'ustihed, and we request.:0 " you respond to oUr request bj October 10> 1979.

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4!e plav. to arrr rlext s atus.report by Ho'refer l97".r- He ei)1, of cevrsr=, continue to keep. tie n>enbers of .your staff .ap;.rais.d of our- f:r."cir ess in the <nterig:. Please feel. free to call roe if vov have any quastiors recardirj this mt',e"..

Very tru"'y yours,

.o'r~~ E. tlhrig =

Vic.e Pr es4!es~',dvan".cd Sy ~e-s P>> .eci;rolrgy P,~UPON"'g '"a r ce: Actinc Director, Division of Gperati!;, R;-actors Robert Loire<<steer>, Esq<:ire

P O. BOX 529100, MIAMI,FL 33162

~Xb~l//y RE <<IMP US'H-.~G REGt'-O'J:!

FLORIDA POWER 4 LIGHT COMPANY 79SEPR8 ~8: 57 September 26, 1979 L-79-273 Mr. James P. O'Reilly, Director, Region II Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission 101 Marietta Street, Suite 3100 Atlanta, Georgia 30303

Dear Mr. O'Reilly:

Re: RII: JPO 50-250, 50-251 IE Bulletin 79-14 Florida Power 8 Light Company submits this letter for Turkey Point Units 3 and 4 in response to the subject Bulletin. Inspections, subsequent evaluations, and reanalysis (if required) are being performed for Turkey Point using our Architect/Engineer's generic program with certain modifications necessitated by plant specific details.

I A total number of 366 isometrics and an estimated 2500 supports have been inspected on both units outside of containment. An estimated 240 isometrics and 1600 supports remain to be inspected for both units inside of containment.

An evaluation of approximately one-half of the isometrics outside of containment have been completed, with the result that only two non-conformances have been identified that had the potential for affecting operability. One case applied to the Unit 3 blowdown piping and was reported and corrected under the requirements of the Technical Specifications (Reportable Occurrence 250-79-26).

A second non-conformance potentially affecting operability of a system Its found in evaluating the main steam atmospheric dump valve vent piping.

(Corrective action has been developed and will be implemented by September 30, 1979). It involves a partial restraint downstream of one Unit 3 atmospheric steam dump valve (a non-safety related piping section). There are six configurations of this type on the steam dump system at Turkey Point (3 on each unit), but a deviation was found on only one of the six locations.

Since only two'ignificant non-conformances have been identified on approximately half of the total piping runs, it is reasonable to expect a minimal number of. significant non-conformances on the remaining pipi ng systems. On Unit 4 at least one analysis has been reviewed in each system, and overall, the deviations reviewed are representative of those found on both units.

In accordance with your letter of August 22, 1979, we are renewing our August 2, 1979 (L-79-210) request to extend the inspection schedule for piping inside containment until the next scheduled outage of significant duration (about November 20, l979 for Unit 3, and May, 1980 for Unit 4). This renewed request is based on the inspection program and results described above, plus the additional justifying information given below.

O" >I>ALcopY 7PfQ J Q+ Qf~g PEOPLE... SERVING PEOPLE

fIr. James P. O'Reilly, Director, Region II Page 2 The design seismic response spectra for Turkey Point Units 3 and 4 is extremely low, but has been conservatively amplified by a factor of three for the maximum earthquake piping response. This conservative approach combined with the use of .5$ dampening provides for an ultra-conservative analysis when compared to present techniques.

The Turkey Point Plant has been safely operating for at least five years under normal operating loads and the contribution of seismic loads is small in comparison. It is highly improbable that a significant earthquake would occur before completion of the inspection. Preliminary results of a probabilistic acceleration study by our A/E support this position. If, during the remaining evaluations, any non-conformances are identified which would affect system operability, they &ill be corrected in accordance with the Technical Specif ications.

Thus, the probability of a seismic event during the period of the requested extension is extremely small. Furthermore, it is our judgement that should a seismic event occur, the probability that a system necessary for a safe shutdown of the plant would fail to operate is also extremely small. For these reasons, Florida Power 8 Light Company has concluded that operation during the period of the requested extension will not pose a threat to the health and safety of the public, and that little additional benefit, if any, will be derived from an earlier inspection. On the other hand, significant costs will be incurred by our customers during the additional shutdown periods required only for an earlier inspection. These costs were discussed in our letter of August 2o For the reasons given in this letter, Florida Power 8 Light Company has concluded that an extension is justified, and we request that you respond to our request by October 10, 1979.

We plan to submit our next status report by November 15, 1979. We will, of course, continue to keep the members of your staff appraised of our progress in the interim. Please feel free to call me if you have any questions regarding this'atter.

truly yours,

~~

Very

)A obert E. Uhrig-Vice President Advanced Systems 8 Technology REU/GDW/YAS/paf cc: Acting Director, Division of Operating Reactors Robert Lowenstein, Es'quire

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