ML20091D589

Provides Addl Info Re 910531 License Amend Request to Revise Fuel Assembly Description in Tech Spec 5.3.1,per 910814 & 21 Meetings W/Nrc

ML20091D589
Person / Time
Site:	Davis Besse
Issue date:	10/15/1991
From:	Shelton D CENTERIOR ENERGY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
1990, TAC-80507, TAC-M80507, NUDOCS 9110250108
Download: ML20091D589 (4)

Text

_ _ _ _ _ _

, pC h w CENTERDOR ENERGY conned c. shdon 300 Maesen Avenue Vce PreWent.Nudear Toledo, OH 436520001 DavisBesse (419)249 2300 Docket Number 50-346 License Fumber NPS-3 Serial Number 1990 October 15. 1991 United States Nuclear Regulatory Commission Document Control Desk Vashington, D. C. 20555 Subject License Amendment Request to Revise Technical Specification 5.3.1, Fnel Assemblies: Additional Information Gentlemen:

In anticipation of the need to conduct fuel repair activities during the Davis-Besse Nuclear Power Station (DBNPS) Seventh Refueling Outage (7RFO), Toledo Edison submitted a License Amendment P quest (LAR) to revise the Fuel Assemtly (FA) description in Technical Specification S.3.1 (reference letter Serial Number 1924 dated May 31, 1991). In subsequent meetings with the NRC staff on August 14 and 21, 1991, '

Toledo Edison agreed to provide supplemental information relative to the LAR. A follovup letter (reference letter Serst,' Number 1976 dated August 29, 1991) provided the supplemental informr*,lon. This letter provides additional information as requested by the NRC Staff in phorn calls earlier this month. As a result of the FA inspe.tlon and repair activities described belov, Toledo Edison is pleased to have met its objective of beginning the upcoming Cycle 8 with no known fuel defects.

Ultrasonic Testing (UT) was performed on all FAs intended to be reinserted for Cycle 8. Eleven FAs which were to be discharged, but which vere potertial substitute candidates, vere also tested. "ive FAs scheduled for reinsertion vere found to have one defective fuel pin each. Three of these five FAs are from Batch 8 (initially inserted in Cycle 6). The other two FAs are from Batch 9 (initially inserted in Cycle 7). The Batch 9 FAs have design features which allow defective pin replacement. The Batch 8 FAs do not have those features.

By inserting eleven FAs which vere originally intended to be discharged, and shuffling the core, the three Batch 8 FAs and one of the Batch 9 FAs were replaced.

c-,n g-

. ti t . Ok I

Operchog Compomes ciewanc eecme muwnonng 9110250108 511015 PDR ADOCK 05000346 {k bemoson P PDP

~

Docket Number 50. 6 License Nurber NPF-3 Serial Number 1990 Page 2 The remaining Batch 9 FA had a defective fuel pin in a location adjacent to a control rod guide tube. This FA vas reconstituted by removing the upper end fitting, extracting the defective fuel pin, moving an adjacent fuel pin into the location vacated by the defective fuel pin, inserting a solid stainless steel (SS) filler rod into the location vacated by O good pin, and then replacing the upper end fitting. The attached Figure 1 shows the location of the SS filler rod lo the FA and the location of the FA in Cycle 8. The resulting configuration has the SS pin surrounded by heated rods (i.e., there are no adjacent cold valls). As discussed in the above-mentioned previous meetings with the NRC Staff, this FA configuration does not require any critical heat flux (CHF) penalties. The channels with the SS pin and surrounding fuel pins are not the lead channels for '>over generation in this FA. The minimum thermal margin for this FA vill be greater than 5 percent relative to the lead power generation FAs in the core.

The cycle-specific vendor analyses to support the Cycle 8 redesign are underway. Preliminary results show that the existing Reload Report conclusions vill remain bounding. The cycle-specific analyses vill further verify that acceptable safety margins are maintained.

Conformance to existing design criteria and safety analysis limits will be confirmed. The attached Figure 2 shows the core r.ap for Cycle 8.

The failure mechanism for the five defective fuel pins is not presently known. Grid fretting is the likely failure cause for the three Br.tch 8 FAs. Based on visual observation, grid fretting did not appear to be the cause of failurc of the defective rod which was pulled from the reconstituted FA. Any follovup investigation of fuel defect causes vill be controlled under the DBNPS fuel integrity program.

The fuel shuffle for Cycle 8 has been completed, and Mode 5 was entered on October 9, 1991. Toledo Edison requests that the NRC process the LAR in an expeditious manner to avoid a delay in the startup of the DBNPS from 7RFO.

If you have any further questions regarding the amendment request, please contact Mr. Robert V. Schrauder, Manager - Nuclear Licensing, at (419) 249-2366.

Very tr yours, gnK MKL/dlm cc: A. B. Davis, Regional Administrator, NRC Region III J. B. Hopkins, NRC Senior Project Manager V. Levis, DB-1 NRC Senior Resident Inspector J. R. Villiams, Chief of Statf, Ohio Environmental Management Agency, State of Ohio (NRC Liaison)

Utility Radiological Safety Board

~

s > vr r- o

~ E~$5S

~

ASSE!!Bl.Y NJ0542 k $ o $ m.

o ::r

• a ,

DATCil 9 RECOflSTITIITABI.E 5=*=

3555

,? e"r o ,?

Core Map Fuel Assembly Map - "w 3%?

A $.

?"

we

_ B

+ C X X o

D k 9 X X E

7 F X X X X O G p __

D0 H G K o I L . _ _ _ . _

J X X X X

,M K 09 L X X 3 -M X X D) N _ .

00 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 O Cyde 7 Locasum O insar. Tube

+ Cyde 8 Locaskm x GuWe Time

(_ g ,

e ton = u ren == mucuve m Q. tona ec wma ss nann a

Docket Nunbar 50-346

. p ec m Number ner-3 DAVIS-BESSE UNIT 1, CYCLE 8

, Serial Number 1990 Attechhent X 7 m3 Figure 2 i , 3 . . . ,

i

. , in g u g ,, ,i ,4 1, i m .d u. .. m .. b.o .. 4As .d A

t -

3 4 s 3;n 6e ba N be b4 A We 6uh 10 JVJ 6d Wd to bh6 9e ber $$ 44J ge e Ccos i en2 cmr i esus Cois 44 e e e Si 4. i e  ? e 11 0 30 to it it is 14 37W to nyt 10 bad be 6tu to be ud . WA la b44 ed 6VN to k)M We 6V6 C

90 3VI ed C0:3 7 eta 2 0037 6 sal C007 7 B&J2 cms C X

t s, r e si X ri e I is to in S in.

i r0 n ei n r2 n nu n 3AQ be til 10 _blJ $$ $V) 10 3VJ 64 Suk 10 3ft et .tw 10 3YH 6d buW to km ed tvA to 3AJ 64 0 C012 4 96KT A00f 4 RcKD Mel :4 GCKY A0GL 4 06mA C013 Nui 74 e si r-i i o er  : e D

?$ 77 ?g 31 79 33 31 37 i 21 77 34 31 M 37 61 $$

bead be bal 98 6v6 lt LAG 89 bug to 376 60 ke to 3Al sie lla 10 3AW 6e bvA 10 6a 3 94 6a4 te C C0ff 4 $6KH C079 3 90K4 $ BaA 3 SMS C042 4 60 C03a me at e S it X e E 39 40 34 41 of 43 X

44 44 67  :

7 di 5 47 7e sa et go gt m .. >>. .d .<w 10 m .6 .iW 0 m .. W6 io uu .. Wi iO 3AA .. .vi 0 m .. 6m u, F 7 B&Ja

,0 ,d u. ..

C035 ACES 3 DeKA Corf a texw COM 4 DeKC C040 3 SoK7 A:su t esM0 Cc33 GuS 47 I 63 Se e e 63 F

12 13 35 S4 65 Se 17 ta e St e ed X 43 s it to et 47 74 a3 73 g4 gg ga bdQ kW buu 10 63W Vu buu 60 3AH 6d 6dt 10 3YN 82 abo be 3fH 6d 6U2 to 3Yf tu but 10 O 63V kW 6v9 10 ba t ud t 85N Co70 4 Dang 4 94iML C043 Came ' 4 BaxP 4 esAn ceso ' i ggtJ1 e 6 10 X e 14 e ti X e 63 0

57 14 to At 70 t 71 0 77 73 74 3 71 70 # F5 77 7s 77 75 to og t he to 3*e seIW4 3fD 4W t 133 #d b6i 9d W-w Codi n ea0 1

CO2 Sw5

. ca.o Con 3Y0 ed t C=i l hhd Wu W tu til

. sac 10 3fL 6d 6fH 10 JaA ed 661 9a e 77 e 3d e Cod Cm. s aar Cois u -Y

$7{ 4.je 3: 23 e $3 37 82 83 84 95 to 98 87 88 t 89 7 'l0 91 97 73 ft 64 9% 04 i

$44 6e 6vp 19 l 632 SW $11 to 3AV 6e Sue 13 3YS ed: !63 sd 3u se 6UJ 10 3AG ad bum 10 See gg g yb 10 gg4 gg K l 85ft Cm4 4 p2 4 gal 3 Cc30 CO1F 4 DanV 4 esMS Cmt t $1u0 X K 07 04 Se 99 i

t3 12 X e 64 cu.s  !

100 11 tot 102 103 tfd 101 108 89 107 70 108 tM 110 111 3A9 68 6664 bd WW 10 2fu 88 6U64 10 3AA ed LUS 10 534 9e bus to 3v9 69 Slu 10 3Al te bv4 10 L CDs0 7 B&JV 6bG de 314 se AcrA 3 B&G Cote 4 86xJ Coos 4 66 4 Cci2 3 Su1 AcsN t tml e 44 X 65 e se :13 64 e se X Cose L 117 43 edie 34 t il 29 114 115 14 'It 11F 190 199 170 17t' 14 177 1 73 to 124 124 t yg b4M 94 64 0 %d buF 10 3YY 4d Sly to 3A3 M'P at 2AH 4e SUl u 10 kw he be W $8 CO,0 4 e.x, C0t. . .. ed'. WI. 10 . SUL . .10

, Com . esi cm. .

e to 54 X X e 6s 33 e up 127 a0 92s in 13o tSt 13 13? 111 to 134 17 139 1M 137 iu as sie 1

N 317 6e VJ 10 t>t ud WV C073 4 86Ku 10 3AJ ed 6UQ 10 3YG ed llP to ADGO 4 $6KU Cott 4 06KZ att te blY AOLP 4 96KN to 6J0 92 bvi i0 312 .. O C076 e 74 67 e 76 e 64 74 N

140 14 9 41 147 14 3 144 14% 14 144 il 14 7 148 let l'A 191 1$2 Jfv 80 %d4 10 had ud tvt 10 13A be bug 10 bet 9d $UN 10 %e l 9d 6VG 10 O 3YU 44 '

Cosi 2 os>Y Cc:2 n sets Ceti r euw Coos e is X $7 Se X o

24 8 tt) 154 47 155 4) 156 *sr its its of ico ist es ter it)

JTS $$ be d 9d b$e I'd lve 10 JTS #d Svu 10 be f 96 be l 9d all ed P

co44 8 8 51/ 2 CC?$ l 8W4 C031 p e 46 46 44 ind ist 44 isa 147 isa f at 17ts 171 1 77 3Af $d bdG 96 6%Q 9d bee 9d 3%A Se e o "

in as na 17s os as 1 77 5 4 3 4 & b / e e IW 11 12 la e4 gg O '

.O

.a me z

- NORTil l Ft12, AlltMSLY fD.

fVEL Al%D4 SLY D Atot(D i AllID'S t'91FIXtD 8 8 t17) BL1L%T D 7%10 9 Y 'NRt" tB fie) DVILNTV ONCY 40 taal M W f1TL leM EMI10(LD

. m n m u.

,,wtr vr 3YO 88 tosm mums m >ourm

. . 3 m inniurto, A . A,m

..um 2 C001 . . .m i.i. m c . mA

4. i > W$ g 3.in u 49 g j (

omenmere= __

QQ C'OYT*0t.(m00Nt'%7 C80t7 000 iramiC Denerm X t t INCutLE DtitCTM CO%OVria AtticsTD 1TR NC WWM A Ainusu.y WNt at ja I