Text

Submits Addl Info Re Feedwater Piping & Inservice Insp Sys, in Response to NRC
	ML19225C615
Person / Time
Site:	Rancho Seco
Issue date:	07/27/1979
From:	Mattimoe J; SACRAMENTO MUNICIPAL UTILITY DISTRICT
To:	Stello V; Office of Nuclear Reactor Regulation
References
	NUDOCS 7908010350
	Download: ML19225C615 (9)
	v • d • e

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?l'SMUD SACRAMENTr MUNICIPAL UTILITY DISTRICT C) 6201 S Street. Box 15830, Sacramento, California 97J13; (916) 452-3211 July 27, 1979 Mr. Victor Stello, Jr.

Director, Division of Operating Reactirs Office of Nuclear Reactor Regulation Nuclear Regulatory Commission Washington, DC 20355 Docket No. 50-312 Rancho Seco Nuclear Generating Station, Unit 1

Dear Mr. Stello:

Enclosed, please find the balance of information requested in your letter of May 25, 1979.

All feedwater piping weld joints inside the containment received mag-netic particle examination during fabrication and 100% radiographic examination af ter fabrication.

The feedwater piping within the containment was fabricated to ANSI B31.7, Nuclear Power Piping,1969 edition.

All piping, fittings and weld filler material was inpact tested in accordance with the 1969 edition of Section III of the ASME Boiler and Pressure Vessel Code, at -11* F or lowe r.

The minimum impact energy for the average of three specimens and for any individual specimen was 20 foot-pounds.

No preservice examinations were performed other than the examinations outlined above following construction. These examinations may be used in lieu of p eoperational examinations per paragraph ISC-230 of Section XI (1971 Edition, Winter 1972 Aadenda) as the examination results are suitable for comparison with subsequent inse.vice examinations and examination records are available at the plant and are identified in a form conciatent with requirements of ISC-600.

Inservice examinations performed to date are outlined in Table 1.

No repo rtab le indications have been noted in inspections to date.

The schedule and extent of inservice inspection is attached as Table 2.

During hot functional testing, there was one occurrence o f "wate r hamrer."

This occurred when feedwater cleanup was being maintained concurrent with supplying los feedflow tc the steam generatoro, shen feedwater cleanup flow was reduced, the feedwater line to the steam generator was exposed to I

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Mr. Victor Stello July 27, 1979 condenser vacuum. This problem has been permaaently corrected by installing a feedwater cleanup line upstream of the steam generator feedwater ccatrol valve.

With this arrangement, feedwater cleanup flow and steam generator feedwater flow can be controlled '.adependently.

Feedwater l'.ne pressure downstream of the feedwater control valve cannot be exposed to condenser vacuum.

This occurrence of water hammer was not related to feedwater nozzle uncovering. The ana. lyses of the main and auxiliary feedwater systems did not include the use of dynamic forcing functions to acco=modate flow instabilities associated with uncovering of steam generator feedwater nozzles.

Since the steam generator reedwater nozzles are not submerged, Rancho Seco Unit No. 1 is not susceptible to the same type of occurrence experienced with systems using submerged feedwater nozzle design. There is no plan to investi-gate a potential trar.sient involving uncovering of steam generator feedwater nozzles.

Water chemistry control is maintained with the AVT process.

Full flow demineralizers are utilized through all ranges of power operation and during startup. A summary of operating cbenistry specifications appears in Table 3.

Sincerelysyours, s

~"

J. J. Matticoe Assistant General Manager and Chief Engineer JJM:WBC:sc Enclosures e,.,

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PGH an3 -02 ULW CGNSTWUCTION CO. - IteSE4VICE INSPECTION SY3rts DATL - 07/16/19 TIME - 1152 PAGL 45 T EN Y EA 4 IN SER V ICE N SPECT !ON SCH c0ULE U.! T - 4.NCnD sECO CUSTUMER SMUD CGNT4aCT - 19J-04d-007 REV 1 OATE - 04/05/79 LOCATION - HERALO, CA COMPONEt.T - PIPING CXAMINATION SCnLDULEO AT OUTAGE SdO'N a

---FIGU4E----

1 2

3 4

5 6

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9 10 SCHED

REM HKS-------------------

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_FIM'. A1E!! CIIDiTSTI:V - ::0*!*!AI. I'0*. ER (Continued)

ANAI.YSIS FRE0t;ENCY SPEC.

SAMPI.E 1.0Cf. TION Total Iron Daily 10 ppb (cax), Note 1 Last Fecdwater !!tr.

Out. (TSS-107) TP-1 Lead Eesirable ucekly on 1 ppb (nax)

Po]ir.h. Denin. Eff.

startup for 4 vecks (TSS-045) TP-l.

i then reduce to once every 3 weeks if Icad is undetcetable.

Note 3 See graded action IcVels below:

FEEDUATER CPdDED ACTTON I.EVEl.S s

.S_o_d i um

~

0-3 pph Nornal Operation.

3-6 ppb Investigate for polisher. bed sodiun break-ti rough and for condenser leakge.

Ma:<irun of 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months operation, ther. corpletc hat shut-doun uithir additiocal 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

6-15 ppb Maximun 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months of operation, then complete hot shutdern within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

>15 ppb Co:aplete hot shutdown within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months of verification.

Cation Conductivity 0 to 0.3 pmho/ca 0.3 to 1.0 L ho/cn Nornal operation.

Maxinun of 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months operation, then complete hot shutdoun eithin additional 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

1.0 to 2.0 paho/ca Maxinua o f 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months operation, then complete hot shutdern eithin additionni 4 houre..

>2.0 reho/c2 Complete hot shutdo.71 within 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months of verification.

Chlorid _e 0-3 ppb Moiral creratien.

3-6 ppb Monitor conder,er hotuell cation condue t t...y for evide::ce cf ccalen wr leak ce Ma:<ir c c f 48 heurr. eperat f or:, t N a complete hot

c. : u' c -

vithin additien:1 '. h e u r r..

6-15 pph Maxir:o:. 2?. hours of oce.ation, then ec:N et e hot shutdc :n wirSin 4 hourn.

>15 rph Cenplete het shar deva iiithin 4 hour:= ei verifJea;iva.

TARLF 1 lof3

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=

FEEDUATl]!_C1!!?tiSTI:Y

';0P':AL PO' ER A::ALYS1 S FCEOUCNCY SPEC.

SAPLE I.0CATTON Total Solida Desirabic u'aily 40 ppb (may.)

Last Fcedwater litr (Includin;; sus-Approxinated fron Out.

(TSS-107) TP-1 pended) sum of iron, sodium, silica and copper Suspended Solids NA Color Cotparison Chart Dissolved Oxygen 7 ppb (cax)

, ~ "

Ilydrazine 20-100 ppb Ammonia Desirable weekly 0.5 - 1.5 ppa Total Silica Three tices a week 10 ppb (na r.), No t e 1.

Last Feedwater Htr Out.

(TSS-107)

TP-1 or Polish Denin.

Eff (TSS-045)

TP-4 preferred.

Total Copper Desirable veckly 2 ppb (tax) p!! at 77*F Desirable daily 0.3 - 9.5 Last Feedwater Her Out. (TSS-107) TP-1 Chloride Three times a treek 3 ppb (r.),

Pote J Conductivity 5.7 - 8 4 tcho/cm Cation Cand.

Daily 0.3 paha/en, Note 1 Sadlur as '.1 Daily 3 ppb (max), Note 1 1.as t Peed a ter 11t r Out.

(TSS-107) TP-1 and Polir,h Denin. Eff.

(TSS-045) TP-4.

3;"t on NairaLI.: wcal:e NA

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TADLE 3 20f3

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TEEC'.*ATi: '. C"!..':IS1!;Y - STARTI'P-If:AfYSIS F_:F7:!'F'!CY SPEC.

St.MPI.E LCCATIO:-

Dissolved 0:qgen As required.

100 ppb (rax). Must I.ast Feeductor i!tr be <7 ppb 3 hrs.

Out.

(TSS-107) after feeding OTSC's.

TP-1 Hycfrazine Daily.

20 - 100 ppb Total Irc.n 100 pp5 (cax).

Must (as le) be <10 ppb S hrs, after feeding OISG's.

pil 9.3 - 9.5 Condenser Hotwell (TSS-033) TP-5; and last Feeduater Htr.

Out. (TSS-107) TP-1

' Catic: Ccaduct.

1.0 ::nho/cn '(22x) belcu 15% 'over (::ote 1) 0.5 t:pho/en (na::) between 15% cud 50% Power (::ote 1) 0.3 t.tho/cn (cax) above 50 Power (::ote 1)

Sodiu.a No specification Silica Chloride Note 1 See graded actica levels below:

FEE 0"3.T::' C?.W3 '.tTIC:: '?"r' q - STA? iP Catica Coriuctivity

>l t:r.ho/cn Max. 12 heure to dre? belor 1.0 ::tho/cn, or cenplete hot shutdeun.-ithin 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

0.5 to 1.0 :- he/cn :: x. M hours ta drop belou 0.5 t: rho /ca, or cocplete hot shutee m uit hia 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

0. 3 to 0. 5 1:r+c /cn ":.

' S !.eu r c, t o d r. n bel o.. 0.3 t.rhe/ce, or cer.plete hat shut Jeun vi t!.in 4 i.ours 7:0'

orral cre rm ica.

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ML19225C615

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