ML19270H443

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Forwards Suppl to 790713 Response to IE Bulletin 79-02, Revision 1 & Response to Six Informal NRC Questions.Suppl Identifies Hangers Being Upgraded to Appropriate Safety Factor During Present Outage
ML19270H443
Person / Time
Site: Crystal River Duke Energy icon.png
Issue date: 07/20/1979
From: Stewart W
FLORIDA POWER CORP.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
3--3-A-3, 3-0-3-A-3, NUDOCS 7908170259
Download: ML19270H443 (26)


Text

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t Florida Power

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July 20, 1979 File: 3-0-3-a-3 ,

Mr. J. P. O'Reilly, Director Of fice of Inspection & Enforcement U.S. Nuclear Regulatory Commission 101 Marietta Street, Suite 3100 Atlanta, GA 30303

Subject:

Crystal River Unit 3 Docket No. 50-302 Operating License No. DPR-72 IE Bulletin 79-02, Rev. 1

Dear Mr. O'Reilly:

Enclosed is a supplement to our response of July 13, 1979 to IE Bulletin 79-02, Rev. 1, dated June 21, tit 79, and our response to six (6) informal questions raised by members of your staff.

This supplement revi.ses our earlier submittal in order to reflect correctly the completed hanger inspection at CR #3. Specifically, this response identifies which hangers are being upgraded to an appropriate safety factor during the present outage and which hangers will be upgraded at a later date. Enclosed is the Table III which provides a detailed schedule for each hanger not being modified during the present outage.

As of this submittal, FPC has responded to all NRC questions and adequately responded to IE Bulletin 79-02 such that Mode 2 operation of Crystal River 3 is justified. The completion of the modification to hangers identified in this submittal for this outage is presently scheduled for July 22, 1979.

If you have any further questions on this subject, please contact us as soon as possible in order that Mode 2 operation of CR #3 can be achieved without further delay.

Sincerely, 2393 318 FLORIDA POWER CORPORATION bl W. P. Stewart Manager, Nuclear Operations WPSemhF01 D43 79081709 59 ,

OpyECLAL COF z r

33733 813 -866 5151 General Off ce 32o1 Tngygurtn sireet soutn . P O Bos 14042. st Petersbu g Fiorida

SUPPL.Ef1ENT TO Jul. 13, 1979 RESPONSE Our response of . inly 13, 1979 identi' ed, in Table II. 191 h a n y.o r - t h.it re-quired undatication to bring them to elthin an acceptable saiet v tietor.

i Hanger DCR-59 was inadvertently left off the table and has now be. n includ-ed on the attached iable II bringing the total of the table to 192 ha u,;e rs.

llowe ve r , you will notice that 5 of the 11 hangers with Indication of ove r-stressed plates have been deleted t r ou t i.c attached Table II (maiked in red ink). These f ive ha nge rs are DCR-68, l>CR-6 9, SWil-10, Swil-125A a n,1 SWR-90.

These were deleted from the list of hangers requiring mo.lification as additional detailed plast ic analysis h is shown that the plates for these five hangers are not ove rs t ressed. This deletton now brings the total number of hange rs requi ri ni; modi f ica t ion , as a result of the completed inspection, to 181.

Of the 187 hangers, 93 will be upgraded to an acceptable safety lactor dor-ing this outage prior to ent erin;; !!vde 2 operat ion at G # 3. The remaining 94 hangers will be upgraded to the appropriate .itety tacte- In accor.lanc.

~

with the attached schedule (Table 111). The breakdown of the 93 nangers is as follows:

76 - moditled because Fs <2 15*- modi f i ed to brin,; hange rs with F3 <2 <4 up to the e<pi l va le nc e of 3 hangers with a safety f actor greater than 4 both upst rea.a an.1 dounstream 2**- moditi"d to bring all hangers in the.pOS column up to the equiva.ence of 3 hangers with a sa fety f actor greatei than a both upstream and downstream of a hanger with an ove r ,t ressed plate.

~39

  • Taole 11 of our submittal of July 13, 1979 identified 32 hangers with a safety factor between 2 and 4 and not having 3 hangers with a safety factor 13 ater than 4 both upstream and downstream. By modi f yini; 15 of the 32 hangers, we were able to provide 3 hangers with a safety factor greater than 4 both upstream and downstream of any hanger with a safety tietor be t wee n 2 a nd 4. The 15 ha nge rs that were modifled are

!!Uil-5 57 SW!!-40 3, 40 2, 17]A, 475 Ddll-514, 585, 529 DilR-19, 18A, 53, 25, 9 DitC-106 DCR-19 ..

    • Of the 6 hangers ident if ied with overstressed plates, 2 (SUH-:;1A o 163) did not have 3 hangers with a safety f actor greater than 4 both upstream and downstream. This required the modification of SWil-161 A 6 165 or the modification of adjacent hangers to provide 3 hangers with,a safety factor greater than 4 both upstream and downstream of SWit-161 A 6 165. It was decided to modi fy hange rs Sull-162 & 166 during %is outago in order to pro-vide 3 hangers with a safety factor >4 up and down f rom SWit-lbl A & 165.

WpSeahF01 khh) hlh D43 .

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TABLE il llULLETIf4 79-02 & 02A IIAfiGLR CliAfiGl 5 RLQUIRLD BY 1)LSIGfl COULS:

RDR - REDESIGfi REQULST f4CR - fiOfiC0!iFORMAfiCE REQULLI FS - SAFETY FACTOR POS - PLATE OVLRSTRLSSED R!l - RED llEAD fillii - fiUMBER OF llAfiGERS TO IllL liEXT llA iGER WITil A SAFETY F Ar, TOR >2 and <4 UP - Upstrea:a D4 - Downstream ,

239'] 320 1BA - One llanger an Anchor A - Anchor is flext E - End of System

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RESI'ONSE TO I NF01 " At. NRC Qllu;I loMS Question 1 Provide a detalled listing of hangers with a safety factor less than 4 and their proximity to other hangers in the system.

Response 1 .

This information is provided in Table II of this submittal.

Question 2 Indicate wh ich ha ng" rs with a safety factor less than 2 are on 1:n ,i nee red Safety Feature Systems (ESF).

ES_s_pon s e ,2 This information is provided in Table 11 of this submittal.

Question 3 Provide description on the testing of redhead anchors at CR #3 and insure they are compared to a 5 to 1 safety factor.

Response 3 .

Shell type (redhead) anchors were tested by insuring bolts were not bottomed ou either threads or plugs and that the re was at least 1/8" between the shell and plate or backing unit, then applying a tension load on the bolt by torquing to specified valves. The shell to plug distance and shell recession were also raeasured. Shells were accepted Lf the shell to plug distance indicated the shell was teated according to manufactor.ar's data. A pre-load was applied to all shell type (redhead) anchors included in this test sample equivalent to five times the analyzed design load or great e r.

Question 4 Provide detailed information or the method of analysit used to est ablish the present safety factor and the new safety factor.

Response 4 All seismic 1 (SI) supports or seismic III supports ad jach t to SI systems (SIII/1) on large bore (2-1/2" or larger) piping that have concrete expansion anchor bolts were analytically reviewe,'. The analysis considered s t ruct ural adequacy for all membe rs, welds, and 3 y expansion-type ho'ts.

In gene ra t ing the load rating, the most conservative geonote ry conbi na t ion of the maxinun distance from the pi pe to the sttoeture was used fu connection with the smallest allowed spacing between anchor bolts which resulted in the wo rs t load case.

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. Responne 4 (Con t '.I)

Mos t supiu rt s were .u 11yzed wi th r i;; I plate analyslu at the ons l . :iow 43 supports were reviewed ut ilizing the flexible plate analy,i, at the o n'.e t . For those . supports that were checked using th: flexible ,' late analysis (FPA) and yielded saf ety f actors greater than 4, no a.blitional cons iderat ion was c,1 ven provided a non co n f o rma n c e report (NCR) eu not issued. .

For those supports t h:it ut ilized the rigid plate analysis (RPA) t echo lque and yielded safety factors greater than 8, no PPA war, considered.

Justification for this approach is based on supports for which RFA and fl%

techniques were utilized and determined that the FFA technique did not reduce the safety factor by more than a factor of 2.

Supports that were checked using the RPA techulques that yleided safety f ac tors of between '. and 8 were then analyzed with the FPA techalque.

Safety factors of 4 or more based on FPA were conaldered satisfactory, provided an NCR did not exist.

Supports that were checked using either the RPA technique or the FPA technique with cafety f ac tors less than 4 were re des i p,.icit to yi. id final saf et-f factors that are consistent with the approach de cribed asuve.

In all of the above cases, NCRs were considered. As of this dat e , field verification of alI supports has been completed. When they were reported, analytical determination w s made that the as-built co n fo ras to the m

approach described above. ,

All supports associated with NCRs or RL)Rs (redesign request ) have bee n design ve ri fied to assure compliance with lli 79-02.

Question 5 Provide a more detailed schedule of the hangers to be upgraded an.1 also thei r acces ;ibility durlug operat ion.

Response 5 A det lied schedule for modif icat ion to each hanger, including accessibility during operation, is included in Table ill of this submittal.

Question 6 l>e sc r i be the difterence he t ween the original design a n.1 t . .da v 's ilo lgo thar is causing so many redesinns. -[

Response 6 The need for redesign of hanger at CR /83 can be summarir ql,into 3 main categories or reasons-

1. Inadequate installation resulted i n 63 Redes ign Request s (RDR).

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1:es p.in..e t. (i:o I ' .t )

2. I;ighty five'(85) RDRs were result ot underdesign for the calculated loads.
3. A change in the prying criteria (11exible vs igid pl.it -)

resulted in 20 RDRs.

Th e : ,.

  • redesigns were a direct ren u i t oi 1- 4'C 's iles i gn , e s i t I c.it ion n1 approximately 1670 hangers and the new flexible plate criteria.

2395343

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