ML19268B826

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Forwards Info in Response to V Stello 790525 Request Re Design Fabrication History & Insp of Feedwater Lines.Sys Meets Code Requirements & Can Continue to Operate Safely
ML19268B826
Person / Time
Site: Millstone Dominion icon.png
Issue date: 06/18/1979
From: Counsil W
NORTHEAST NUCLEAR ENERGY CO.
To: Reid R
Office of Nuclear Reactor Regulation
References
TAC-11793, NUDOCS 7906210198
Download: ML19268B826 (27)
v • d • e


Text

{{#Wiki_filter:' IMHFI'HI!AfiT trrII.ITII!!i ^ RTFoRo CONNECTICUT 06101 (203) 6E6-6911 C * * ^ L L A 'll June 18, 1979 Docket No. 50-336 Director of Nuclear Reactor Regulation Attn: Mr. R. Reid, Chief Operating Reactors Branch #4 U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Reference:

(1) V. Stello, Jr., letter to All PWR Licensees dated May 25, 1979. Gentlemen: Millstone Nuclear Power Station, Unit No. 2 Feedwater Lines in Ref erence (1), tha NRC Staf f requested, pursuant to 10CFR50.54 (f), informa-tion regarding the design, f abrication history, and inspection of feedwater lines at Millstone Unit No. 2. In response to that request, Northeast Nuclear Energy Company (NNECO) hereby provides Attachment 1, Information on Feedwater Lines. As stated in the Attachment, NNECO notes that the feedwater piping system inside containment has been qualified to applicable Code requirements. This, in conjunction with the acceptable operating history, coufirms that Millstone Unit No. 2 can continue to operate safely in accordance with the requirements of DPR-65. This retponse includes all information available regarding your request; taerefore, NNECO has no plans to provide a 60-day supplement to this letter. Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY /) $'ll4L k G. Counsil Vice President Attachment 95003059 790621aJ75 '

DOCKET No. 50-336 ATTACEMERf 1 MILLSTONE NUCLEAR POWER STATION, UNIT NO. 2 INFORMATION ON FEEDWATER LINES JUNE,197 9 95003000

  1. 1 NILLSTONE UNIT NO. 2 INFORMA TION REQUESTED ON PWR FEEDWA TER LINES DESIGN 1.

Providc ac-built piping or isometric dravings of the fecduater linc to steam generator sparger uithin containment. Shou details of the design euch as dimensiono, pipe schedule, support typc and loca tions, pipe restrainto, and valve (c).

RESPONSE

The piping icome tric for the Hillstonc Unit No. 2 fecduator piping cya tcm incide containment io provided in enclocad drauing 2503-SKH-320. The dcoign details for the etcan generator fccduater nonnic are shown in the enclooed drauing. 95003061

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P2 MILLSTONE UNIT NO. 2 INFORl!ATION REQUESTED O!! PWR FEEDWA TER LI!!ES DESIGN 2. Provide the rceutto of any stress or fatigue analyces which was performed for this system. RESPONSE _ The Milletone Unit no. 2 fceduater piping inside containment wac Jccigned to ANSI B31.7. Claco II-1969. !!o fatigue analycco arc ecquired for Clace II p. ping systems. l A copy of the otroso analgeis summary for thermal expansion, operating carthquake conditions, design basic carthquake conditions for the feedvatc1 piping system inside containment, and a cummary of forces and momanto at both ctcam generator fecduater nonnico for decign bacia conditions, is enclosed for i nfo rma t.io n. 95003065

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  1. 3 MILLSTONE UNIT NO. 2 INFORMATION REQUESTED ON PWR FEEDWATER LINES FABRICA TION HISTORY 1.

Supply a list of the materials for the steam generator sparger, etcam generator facduater nozzles, and fccduater piping uithin containment.

RESPONSE

The list of materiale is as follous: 1. Stcam Generator Feeduator Nozzle SA-F08, Clace 2 2. Steam Gcncrator Facduatcr Nozzle Safc End SA-508, Class 1 3. Steam Generator Sparger ASTM-A-106, Grade B 4. Fecduatcr System: (a) Piping 18" Schedulc 60/ ASTM-A-106, Grade B (b) Fittings ASTM A-234, Grade WPB (Wall Thickncse to Hatch Pipc) 95003071

  1. 4 MILLSTONE UNIT NO. 2 INFORMA TION REQUESTED ON PWR FEEDWATER LINES FABRICATION HISTORY 2.

Provide the details of the ociding process (ce) used to make the nozzle-to-pipe, pipe-to-oparger, and piping veldo. include details of uciding such as preheat, joint configuration (include vith or without baching ring), and post acid treatment, if any.

RESPONSE

(a) The ucid joint configuration for the feedvater piping and pipc-to-cafe cnd velds is as shoun on the enclocad drauing 7604-US-2, Rev. 7, for pipe class EBB 18" Schedulo 60 piping. (b) The opccific uciding procedure for the cafc cnd to piping and fecduatcr piping velds " Welding Procedure Specification PI-A T-Lh ( C VN ) " is enclosed for information. The root paco of the butt ocido vac done by the Gac-Tungsten Arc procces. The use of consummable incerto vae optional. Ho uc v e r, if used the cons ummab le inserts vere of the same material as the ocid filler metal. Permanent backing rings ucre not used in the subject system aciding. (c) Prcheating of ucide uas in accordance with Paragraph 1, 2-7 31-2 of ANSI B31. 7. (d) Post ocid heat treatment for pressure piping ocido vac in accordance with Paragraph 1, 2-731 of ANSI B31.7. 95003072

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Ch Fmt mpt snL. chs /c l s* % P I n - u M v ri ) P wer L Industrial DECHTEf CORPOR ATidNA , Materials & Fab'rication ivision Welding Procedure Specificah Quality Control e rvice s Pr epa r ecO/ od nyk/ [d h h)ise. y_ g, Q P1-AT-Lh (CV )pg M a n a c e r o f E n c in'e c r in:' Revision 0 Date 4/15/71 G. B. G rabld Authorized for use only when siened by the Division Manacer of Encineerinc. This welding procedure specification must be used in conjunction with the General Weldine Standard (s) GWS-FM Scope: Combination manual gas tungsten-arc and shielded metal-arc welding of impact quality carbon-steel piping materials using the open butt technique without an internal This procedure is to be used where impact properties are required. r,a s pu rce. ase Metal: Ca rbon steel Typical Joint Design Welded to Carbon steel 1: j ASMF Sect. IX: P# 1 _t o P # 1 k,, ; '/n,, M n-arc (G1 A) and Welding Process: G a s tur p~ shielded metal-a rc (SM A. f g Filler Material SF A

5. IR /.

8 A 5.18, Cla s sifi. THICKNESS 3 /16" T HROUG H 3 /'8"~ cation E7 0s-2 a nd S F A -5.1/ AWS A 5.1, Cla s si- }O 12* fication E7018 (Note 2) 10 t 1 d ASME Sect. IX: F# 4&6 A li 1 _4 f -- -.{ Yy a 67 \\ Positionis) Qualified: All nositions Thickness Range Qualified: (Note 3) n -f 'a & y*a A P 2 A s -welded: M in. 3 /16" Max.2-1/4" 3 ~ O~ U f Postweld Heat T reated: Min. 3 /16" Max.2-1/4" I Backing Material None M in. Preheat Temp. 60"F (Mate 4) d I*-- Y I '! 8 Interna ss temne rature 350"F max. ~~T_gyf Postweld Heat Treat:(When reouired) one hour / inch at 1100 F -1200 F ( r e f e r t o R fr-5 00 h FHT-501) THICKNESS GREATER TRAN 3/8 Applicable Procedure Qualification Record (s): pQ R -19 h PO R - 20 Procedure Qualified to: ASM E Section IX and ASM E Section III. Pa ra. -N-541 Weldinc Proces s GTA GTA SMA SMA SMA Lave r Numbe r 1 2 3L Rem. R emaind e r Remainder Travel Speed (in. / mini 16 1.6 2-11 2 - 11 l 2 -11 Ampe ra ce Rance 60-100 60-100 I 70-100 l 115-165 140-180 A C / DC. Polarity nccP DCSP l DCRP DCRP DCRP Voltace to-16 1 10-16 1 22-28 22-28 22-28 , rgon Argon Torch Gas - cfh. w ~" ~" "~ ,,13,- 2 5 18-25 Backing Gas - cfh. .r.;.. n e None Elect rode Diamete r 3/32" or 1/8" 3/32" o r 1/ 8" 3/32" 1/8" 5/32" Tungsten Type 11%2 % T ho r. it'" 2 c~n T ho r. Filler Wire Diameter l }/8" 3/32" o r 1/d" Ad.ditional FAntructions Note 1: File the top corner at about 45 to produce approximately a 1/32-inch land (Q thickness. l Note 2: AWS A 5.18 may be u.d when identical to ASME SFA-5.18. AWS AS.1 may be used when identica* o ASM E SFA-5.1. Note 3: See PIIT-500 for maximum allowable as-welded thicknens permitted unt!cr the pa rticula r Code governing the fabrication, p

gr.j

,95~00 m:.a 2

5 S 4 l m I Welding Proci dure 9pecification Pl-AT-Lh (CVN) Revision 0 Date 4/15/71 Additional Instructions (Continued from Page 1) ) i l Note 4: See Drawing GWS-FM-1 for special circumstances where higher pre-l heat temperatures are required, i, t ) i 1 ) i \\ i l ? i i I l 950030/3 I Pagi 2 of 2 i

95 MILLSTONE UNIT NO. 2 INFORMATION REQUESTED ON PWR FEEDWATER LINES FABRICATION HISTORY 3. Provide the NDE performcd during and after fabrication of the veld jointe requested in Question 2.

RESPONSE

For shop fabricated feeduatcr pipc, the NDE during and after fabri-cation of the ucid jointe vae basically in conformance with the procedural and quality requiremente act forth in the applicable acetion of B31.7 (1909) and Scotion IX of the ASME Codc. For field fabricated and installed fcedvater pipe inside containment, the NDE during and after fabrication of the veld jointe vac performed in accordanac vith the requiremento of ASME III (1971 Edition), Clase II. In addition to the above requiremente, the follouing NDE vas per-formed: (a) Each layer of uciding uas inspcoted for smoothneco, slag inclusion, cracks, pin holce, undercut, and fusion to adjacent ocld beado and bacc metal. (b) All butt ucido in the feeduater piping sys tem incide cont ain-mont acro 100% radiographed in accordance uith the applicabic code. 95003076

fi C MILLSTONS UNIT NO. 2 INFORMATION REQUESTED ON PWR FEEDWATER LINES FABRICATION HISTORY 4. Provide the Code edition to uhich the lceduatcr piping cyctcm vac fabricated.

RESPONSE

The chop fabrication of the fecduatcr cyctem piping incido contain-ment vac donc in accordance uith the code for nuclear poucr piping A NSI B31. 7-19 69. The fictd fabrication and installation of the facduator piping incide containment uac donc in accordance uith ASME III (1971 edition), Clace II. 95003077

H7 MILLSTONE UNIT NO. 2 INFORMA TION REQUESTED ON PVR FEEDWATER LINES PABRICA TION HISTORY 5. Stato t.hc fracturc toughnces rcquircments, if any, for the feeduator piping cyctem.

RESPONSE

A Charpy V-notch NDTT temperature of +20 F vac spccifica for the 18" 0 Schedu?c CO pipe class EBB (fccduater piping insido containment) piping. The minimum absorbed energy vac in accordance uith H-421 of the ASME III Code. 95003]78

68 MILLSTONE UNIT NO. 2 INFORHATION REQUESTED ON PWR FEEDWATER LINES PRESERVICE/ INSERVICE INSPECTION AND OPERATING HISTORY 1. State whether the fecduatcr system ucido rcccived a precervice inspcotion in accordance uith ASHE Boiler & Precourc Vcccel Codc, Section XI.

RESPONSE

A proccrvice c=anination of the too (2' steam generator fccduater nonnic to chall ucido vac conducted for information only in January 1975. Theco craminations ucrc performed to the criteria of ASME Scotion XI, Winter, 1972 Addendum. No reportabic indications ucre noted. The balance of the fccduater system did not roccive a preservice incpcotion ac requiremente to invoke the Summer 1975 Addendum to ASHE XI did not becomo effcotive at Millotonc Unit No. 2 until April 2C, 1979. 95003079

IID MILLSTONE UNIT NO. 2 INFORMATION REQUESTED ON PWR FEEDWATER LINES PRESERVICE/ INSERVICE INSPECTION AND OPERATING HISTORY 2. Provide the c: tent of inscruice inopcotion pcrformed on the fcedoater pipe to otcan generator nocale ocide. Include the results of the a:aminatione, any corrcotive actions takon, and caucco of any failurce.

RESPONSE

There hav: been no inecrvice inopcotione of the Class 2 portionc of the fecduator cystem to date. 95003080

f!10 MILLSTONE UNIT NO. 2 INFORMATION REQUESTED ON PVR FEEDVATER LINES PRESERVICE/ INSERVICE INSPECTION AND OPERATING HISTORY 3. Provide the schedule and c tent of inservice inopection for the fecduator ayotem for the nc t inopcotion interval.

RESPONSE

Present plano call for volumetric c amination of one 18" fecduatcr piping to o tcam generator nozzle ucid before July 1982 and tuo 18" piping ucido before the end of the prcocnt (first) inopcotion interval in December 1985, per Category C-G, Summer 1975 Addenda. 950030BI

  1. 11 MILLSTONE UNIT NO. 2 INFORMATION REQUESTED ON PWR FEEDWATER LINES PRESERVICE/ INSERVICE INSPECTION AND OPERATING HISTORY 4.

Provide any hictory of water hammer or vibration in the feed-ua tcr cyc tcm and decign changes and/or actions tahcn to prevent thcoc occurrenecc.

RESPONSE

During the performance of T-INT-3000, Precore Hot Functional Test, a valcr hammer vac obocrocd coincidcnt vith a cooldoon transient resulting from a precouri::cr relief valve that lifted. This has been the only obcarved vater hamme r. The engineering colution con-cis ted of inctalling standpipcc in the fccd ring of both etcam generators. Thic fi: vac implemented between precorc and postcorc hot functionale and vac caticfactorily tested during the Postcore Hot Functional Tcot. A further refinement of the modifications vac made during December 1970 and January 1977. This conciated of removing all of the standpipcc and blanking the holes. Thirty-cix (3G) three and one-half inch (3%") clbouc ucre inotalled around the top of the feed ringo. This modification uac tcoted uith fcad ratcc up to 600 gym after the food ring had been uncovered for fiftcen (15) minutco with,no obacrued water hammer. Thcoc arc the procent rectric-tione as opccified in Amendment No. 32 of our operating licensc. 950030EL2

M12 MILLSTONE UNIT NO. 2 INFORMATION REQUESTED ON PWR FEEDWATER LINES PRESERVICE/INSER VICE INSPECT TON AND OPERATING HISTORY 5. Provide a deceription of feedvater chemistry controle and a summary of chemistry data.

RESPONSE

Feedaatcr chemistry controle for Hilletone Unit N>. 2 are cummarized in Tabic 1. When the normal value is exaceded, the cause of the probicm io inocotigated and corrected. Plant responces to cxeccding a normal chemistry cocalate, depend on the parameter and nature of the problem. Control valuce in chemistry conditions that require are listed in various actions including power reduction and shutdoun Tabic 1. Some chemistry parametcre are monitored continuoucly by means of on-linc analyncrs, as indicated in Tabic 1. The other listed parameters arc determined on a campling baeio. Facduater chemistry is also controlicd indirectly by means of stcan gencrator chemistry control. Thus, uith some parameters, a fau l t feeduator condition vould be detceted in the etcan gencrator prior to becoming detectable in the fecdoater, due to the concentrating action that occuro in steam generatore. On-line analyzero and chemistry controle for etcan gancrator chemistry are provided in Tabic 1. Typical chemistry data for Millstone Unit No. 2 is given in Table 2. 95003083

M13 "U 4 43 b 4 m L Q W L Q O O O to l N D D L

.o W

N *, D W G O

  • U t

q gn O OO .W N NN N N y g q ts O

  • H Q

Q 'M M Z c 4 D N t o O U fr O 'n D td a

t at ts NO 04 L
  • ta O

Q o o N to Q to .Q 4 43 t.r3 R (b ga va '9 Uo y 'O E' Li Q N '9 q O '9 EL 'U k: lt; to ts 1: U 4 W N y 0 N N h =< 1: Q e) O cel

  • c 70 et

( m l

  • Q 4

4 Q Ic to I W C1 N 'M O "U L 'ra U DDO O, to' W. D D to' ts M Q N O' Ca O ca ga [c' rrf t-tw ewNN N. q g n gg s, gj g g o v vv vvvv vv vvvv O N Q N "U t It; +R

  • C 0

o O fc Ic q U l4 4 ,' 4 ,Q q N I' O W u

?,

,3

s O

C M E, c U

  • 9

[5 q to La Ch 14 m a e o a ry c o t, L to D Q R N Q H ta to to ta to to to to to 0 N O g" Q g*D N D E M I4 O QN O';.4 g,.4 .D D 4 q b ct; iM O Oo e M Q O' E4 h: M ,R DQ b o '9 H Eq Oh R tt O t G a N O = Q L tr 'U % '9 L3 O N G .O U L H ft; "U O EL E-4 N 4 O M 4, q{? 4 (32 L O =:- E o ex 9 2 n 9 e o m e ? O Q "U O D O Et1 0 n, tu F .c e 'o N h O N EL 12 4 m 4a "U f4 lb d 4 0 0 O N ft; + M, p O HN 4 I4 ,a ch U eO i s .n U

u. E r

I4 EL U Q EL (L.O *Q R dN E EL E M f! to C L t EL O ft (L Q. D, CL O Et it O EL e r *9 Q % sh (% LL O LL 3 o q* O it Q, CL EL n q N v= "U 9 N O N O o. tt: to % to %O 44

  • f
  • 9 Lt* O N ca tt* 1 %N tt!

3 tu ao N OU U NO it 4 Q,0 O b, a b It. O Q. M O % O O E?. D 4 Q QN s U O to

  • Q A e

Q .c mQ a o E E O OQ "U R '9 "U e g g g o o +1 2 3 +a O .R 0 0 W Dt "J.* O W e,0 8{s tosD 4 et 0 M ~, %e N W 95003Ud4

  1. 14 MILLSTONE UNIT NO. 2 INFORMATION REQUESTED ON PWR FEEDWATER LINES TABLE 2 TYPICAL CHEMISTRY DATA AT MILLSTONE UNIT NO. 2 (DA TA FROM WEEh' ENDI','C 1/0C/79)

SYSTEM PARAMETER VALUE FeedJatcv pH S.95 Cat.Cond, u~thoc/cm O. C5 Orygen, ppb

3. 0 H rdrx:inc, ppb 8

A":monia, ppb 201 Copper, ppb C.1 Iron, ppb

2. 7 St ca": Generator pH
8. 71 Cat.Cond. umhoc/cm 0.6 Cond u~; hoc /cm 1.70 Sue. Sol., ppm

<0.010 Chloride, ppm <0.05 Sodium, ppb 9.4 Amonia, pp": 0.144 Copper, ppb 0.35 Iron, ppb

2. C Silica, ppm

<1.0 95003085}}

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