ML18114A728

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Accepts Util Provisions for Minimizing Possibility of Water Hammer Events Due to Rapid Steam Condensation in Feedwater Sys
ML18114A728
Person / Time
Site: Surry  
Issue date: 06/07/1978
From: Schwencer A
Office of Nuclear Reactor Regulation
To: Proffitt W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
Shared Package
ML18114A726 List:
References
343-060778, 343-60778, NUDOCS 7906250351
Download: ML18114A728 (7)
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UNITED STATES Cef'l(') JCl-.

NUCLEA!1 REGUL_AT011Y COMMISSION

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WASHINGTON, D. C. 20S55

.. /,;,(:,017 'i Docket Nos. 50-280 and 50-281 1

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JUNE 7 1978

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. r-Virginia Electric'& Power Company ATTN:. Mt~. \\*J. L. Proffitt JUI~ 1 2 *1ci:o m r p

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Senior Vice President - Power Post Office Box 26666 Richmond, Virginia 23261 Gentlemen:

As part of our generic reviev, of secondary systemfluid flow instabilities at nuclear power plants, \\'le have reviewed your submittals dated May 10, 1976, and December 2, 1977, for the Surry Pm*1er Station, Unit Nos. l and 2.

Based on *our review, we find that the prov1s10ns \\'1hich you have made for minimizing the 1 i kel ihood of water ham;ner events due to the rapid condensation of steam in the feed1*1ater systems at Surry are acceptable.

Enclosed is our Safety Evaluation Report supporting our fi;iding.

Enclosure:

Safety Evaluation Report cc \\*1/ enc 1 :

See next page

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A. Schwencer, Chief Operating Reactors Branch #1 Division of Operating Reactors

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._/r-; 1-e R~fer to T;t:-1lcs 7-2, 7-3 nnd 7-4 for

.:1. coi7lprcher:sive di.s;:>lcty of the c\\::.-::ic:.i..

tce.?..c:.1,~nt sc~ccifi.c;iti.ons for vario*Js opcr-ati~g and *rest conditions..

Thcs~ specifications in g2~eral are based on:

1.

The use of 2mm6nium hydroxide or. an. amine ror feedwater and sten::1 prt control.

r\\~oniu::1 h..tdro~*:ide is pr~2ferred; however, QOrpholine and cyclohexylamine are acceptable provided they.do not reduce the sensitivity of the free hydroxide determination.

in the feedwater train.

3.

Continuous hlowdown and continuous chemical addition.*

4.

Limiting the concentrations of contaminants in the feed-water and in the steam generator.

Each chemistry parameter is discussed in detail in the follo,,ing sections.

7.2.2 Feedwater Chemistry Control Parameters Both the feedwater and steam systems are orice~t;,.rough systems requiring*that any chemical tr.eatment of these systems be based on the AVT concept regard-less 0£ the chemistry used in the steaI:t generator.

This conc2pt has been adhered to by Westinghouse in its previous and present speci-fications re.lat-

. ing to feedwater chemistry control*.

Any discrepancy between the* specifica-tions stated in Table 7-2 and those required by the equipment supplier ~ust be brought to the attention of ~estinghouse and the equipment supplier.

Dissolved Oxygen For co!'rosion preventi.on, oxygen must* be eliminated as far as possible from the feedHater enterin_g

There must be no detectable oxy-gen ( <O. 005 ppm) present Tn the blowdown under any operating or test: condi-tion.

Oxygen is controlled by the addition of hydrazine at the discharge of the co.ndensate pumps.

THE USE OF SULFITE FOR THIS PURPOSE IS PROHIBITED.

For hot functional testing and hot standby, the concentration of oxygen in the feedwatcr can be 0.1 ppm or less provided the concentration of hydrazine injected into the steam generator is 3 to 5 times the oxygen concentracion in the fe~dwater sour~e.

7-4 Revision 1 J.::rnu.J.ry, 1975

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H;draztne is add2J to the.fe~d~atcr ta control o~y~en ~s rnentioried 2~cve.

T~~ concentratic~ of hydrazine in the ste~~ drum durin~ hydro and ~et l~yu?

s~st oe in the ran;e 75 -

150 pp~.

For hot function~l testing and hot

_standby tne hydrazine conce!".tr2.tion in the feed,.:ater should.be maintai!!ed at 3 to 5 tir:,es the oxygen concentration in the feed,.;ater source.

For po~er operation, it is reco::;_--:iended that a T--wdrazine residiial of >0.005 !J~S in excess of the E_eedwater oxygen be maintained downstrear:z. of the highest

7. 2.3 Stear.,. Generator Cnemistry Control Para..iete.rs pH When controlling stea..i generator chemistry on Avr chemistry it.;iust be rec-ognized that 1) AVf provides no buffering cap.a city-foi: contaminants entering the steam generator and 2) the steam generator bulk water pH is at: or slightly*

in excess of the neutral pr!° for water at: the operating temp~raL1.1,re of the stea-::1* generator.

The absence of alkalinity in the steam generator at its operating temperature is due to the lo,;.;r ior'_ization of* the feed-.:ater pH con-trol amines at these ter;i;i'eratures.

Therefore, cqnta:uinants errt.ering.the steam generator that are more strongly ionized *than: tile fee4water pH control amines have the potential for* producing major pertu-rbations to the bulk water either ~n the form of free hydroxide (from fresh waters) or acidity (sea water or treated circulating water -

cooling towers).

Clearly then, the objectives of th~ steam generator pH control parameters stated in Tables 7-2,

  • 7-3 and 7-4 are to provide a means for controlling free hydroxide or free acidity in the steam generator bulk water to minimze cor-rosio!! of the steam generator materials and turbine cycle and to provide a

~eans ~hereby perturbatLons to the steam generator cbemistry from sources such.as condenser_ lea.kage can be recognized.

Such a determina.tion is possible for alkaline producing fresh water using the relationship bern-2en the pH and the concentration of the contr_ol ami.ne a~ a sample temperature.of 2S'"C.

Fig~

m:'e 7-1 presents such a relationship for ammonium hydroxide.

In the case of a sea water intrusion into a steam ~enerator on-AVT che~istry control a blowdoi,.rn pH depression is ex.pee tcd.

The ~.ngnitude of the pH depres-sion at temperatur~ ~as calctil~ted from d~t~ developed by D. J. Tutner 7-5 R...:!vision 1 January, 1975

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./) r.. ~1,1ator (Au,111.ry, feoduoter) 1hall be or conJonut1 Mk*up qu4\\ltf to which alllllQnlum hydroddu nnd hydrulno *aro add*J ut _cl19 Jnlqt lrto tho '"'""

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hl284622-lu System and Prob. No.

322B 334B Aux. Feedwater 417 607 Pressurizer Sprav.& Relief 635 630 Residual Heat

  • Removal 540 508 Service t.Jater 465 Com~onent Coolin£ 488/480 507/481 614 512 603A

-06103/79

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TABLE 3-2 !CONT'D)

SURRY POQER SIAIIOH, UNI! 1 NOZZLE AND PENETRATION

SUMMARY

.Total No..

of Nozzles and Pene-trations 111 1/1 0

3 1

5 0

4 4

4 4

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l Uo. Accep-table_

Evaluatiori* No. Under (Complete)

Evaluation lh NIA 2

0 NIA 0

4 NIA NIA N/AIO NIA/0 U/A.

l l

NIA 4

0 NIA NIA

  • S~ress analysis not cocplete; loads not available NIA not applicable Modifi-cations or Additions Reouired 0

NIA 0

Page 3 of 7 Comment*

. Original ARS 3.11 SSI/ARS SSI-ARS SSI-ARS Inc or.::;i 1 et: e Inco::-:plete Incomplete SSI-AF..S Inco::iplete Incomplete Incomplete 3.13 3.16 3.18 3.21

3. Z.:.

3.25 3.27 3.Z~

3.32 3.J3 3.35 3.37 3.40 3.42 3.45 3.47 3.50 3.S:

3.S4 1

  • hl2&'4622-lu Syst:em and Prob. No.

545/5600 546IS620 54SC 547 744/754.

548A 548B 544 544A

  • s44B 751 562/546 745 Main St.earn 323A 322A 334A 346 Feedwate:.

323B

-0610317.9 TABLE 3-2 (COllI'Dl SURRY POUER SIAIION, UNII l NOZZLE Mm PEHEIRAIION

SUMMARY

Total No,.

No. Accep-of Nozzles table and Pene-Evaluation trations (Compl~tel 0

l 0

1 212 2

2 i

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1/l 1/l 1/1 0/3 111 NIA.

0 NIA 1

2/2 2

l 2

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Modifi-cations or No. Under Additions Evaluation Reauired NIA l

NIA 0

010 0

l 0

N/A l

0/0 0/0 010 N/A/0 NIA NIA 0

010 0

0 0

NIA 010

  • S:ress analysis not complete; loads not available N/A not applicable P ag.e Z of 7 Co::;nent 2.25 2.27

. 2. 29 Original ARS 2.31 Incor.:plete 2.33 SSI-ARS 2.35 SSI-ARS 2.37 SST-ARS 2.3.9 Orisinal ARS 2.~3 Orisinal ARS 2.45 2.47 Incor::-;:,lete 2.49

  • 2.sz SSI-ARS
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SSI-ARS 2.. 57 SSI-ARS 3.1 Incc::i;:ilete 3.3 SSI-ARS 3.8

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