ML19254D639

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Forwards Util Operational Commitment to Limit Use of Main Feedwater.Provides Details Re Design Flow Path of Feedwater Leaking from feedring-sleeve-nozzle Area Into Steam Generator
ML19254D639
Person / Time
Site: Calvert Cliffs  Constellation icon.png
Issue date: 10/15/1979
From: Lundvall A
BALTIMORE GAS & ELECTRIC CO.
To: Reid R
Office of Nuclear Reactor Regulation
References
NUDOCS 7910290257
Download: ML19254D639 (8)
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Text

{{#Wiki_filter:. 9 BALTIMORE GAS AN D ELECTRIC COMPANY GAS AND ELECTRIC BUILDING BALTIMORE, MARYLAN D 21203 Aarsua E. LUN DVALL,JR. october 15, 1979 Vscs PatslOENT Swmv Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Co= mission Washington, D. C. 20555 Attn: Mr. Robert W. Reid, Chief Operating Reactors Branch #h Division of Operating Reactors Sub.j ect: Calvert Cliffs Nuclear Power Plant Units Nos. 1 & 2, Dockets Nos. 50-317 & 50-318 Steam Generator Feedvater Water Hammer

Reference:

BG&E letter dated 11/13/78 from A. E. Lundvall, Jr. to H. R. Denton, request for amendment. Gentlemen: The referenced letter contained our initial request for the deletion of the feedvater flow restriction contained in the Calvert Cliffs Unit No. 2 operating license (para. 2.c.3). That request was made based on our having made a design modification to the feedvater sparger ring which resulted in a top discharge rather than a discharge from the bottom of the ring. babsequent to the above request, NRC notified us that they were absorbing our request into their generic water ha=ner review effort and that additional information would be required to aid the NRC Staff in this effort. Several verbal and written co==unications have ensued concerning operating procedures and design configurations. As a result of those comunications, the water ha=mer issue has effectively been resolved, and the purpose of this letter is to fo: Ally document our operational commit-ment to limit the use of main feedvater under certain conditions and also to provide details on the design flow path of feedvater as it " leaks" from the feedring-sleeve-nozzle area into the steam generator. Accordingly, the enclosures to this letter provide the following information: Enclosure (1) Cleanar.ces between labyrinth seal area of sleeve and feedvater nozzle. Enclosure (2) Clearances between sleeve and feedvater nozzle. Enclosure (3) Operational commitment and discussion of design leakage. b r 4[ J Enclosure (h) Combustion Engineering Drawings: E 233-173-6 E 233-180 E 233-189 bg7 1 7910200

Mr. R. W. Reid October 15, 1979 r All of this information has been provided verbally to your Staff. It is assumed that your generic vr.ter hammer review encompasses both Units of Calvert Cliffs and that the resultant license e.nendment vill include both Units since both have the sa=e feedring modification and both will have the same operational commitnent detailed in Enclosure (3). Also, we have determined that the enclosed information constitutes supplem-entary information to our previous referenced request, and that no additional fee is required pursuant to 10 CFR Part 170. 7: Very truly yours, ') ~. @ h <___.[ ~ + 'rb4b cc: J. A. Biddison, Esquire G. F. Trowbridge, Esquire Mr. E. L. Conner, Jr. - NRC Mr. P. W. Kruse - CE 1221 061 N N

1 ENCLOSURE (1) i 1.abyrinth Seal Assembly Drawing 233-180, Detail "F" { +.000" l 0.D. 16.122 " .005" Feedwater No::le Assembly Drawing 233-173, Detail "A" +.005" I.D. 16.125 " .000"

1) Minimum Seal to Nozzle Tolerance 16.125" - 16.122"=.003" Radial Clearance 003" t 2 =.0015"
2) Maximun Seal to No::le Tolerance 16.130" - 16.117" =.013" Rndini Clearance 013" t 2 =.0065" 122!

062 4 mew w e m m w.~ wsm m -

t ENCIDSURE (2) Feedwater Sleeve Assembly Drawing 233-180, Step #2 0.D. 15-7/d" + 1/i; ' Feedwater Nozzle Assembly Drawing 233-173 I.D. 16-1/4" + 1/32" -0

1) Minimum Sleeve to Nozzle Tolerance 16-1/4" 15/32 = 25/32" or.78125" Radial Clearance.78125" 2 =.391"
2) Maximum Sleeve to Nozzle Tolerance 16-9/32" 13/32" = 28/32" or.875" Radial Clearance.875" 2 =.4375" 1221 063 k g-

~ ENCLOSURE (3) A. Discussion of Desian Leakare Path \\ Combustion Engineering, Inc. (CE), our NSSS Supplier, has informed us that since all other possible drainage paths from the main feedring are seal velded, the only drainage (leakage) path would be behind the sleeve, past the labyrinth seal. CE has also conducted a brief review concerning the amount of leakage during a trip condition when the flow 0 rate in the main feedvater nozzle is reduced to 55 flow at 70 F vhich is approximately 750 gpm. It is their engineering judgement that, with the basic geometry and obvious flow restrictions involved in the labyrinth region of the liner, the flov leakage behind the liner during these conditions vill be less than the mass flow in the pipe, and therefore, with the top discharge modification to the feedvater ring, the pipe and feed ring should remain full of water. We concur with this en6 neering 1 judgement and have concluded that a detailed design calculation is not necessary. B. Operational Commitment Given the initial condition that the steam generators are being supplied with feedvater from the main feedvater system via the main feed ring, we propose to continue to supply feedvater using this path provided the following conditions do not exist simultaneously: a) The volumetric flow rate of main feedvater being supplied to a steam generator drops belov 5 percent of full (100%) feedvater flov; b) The water level in the steam generator drops below the top of the main feedring. If the above conditions exist simultaneously, ve propose to cease feeding the steam generator from main feedwater and to commence feeding the steam generator using the auxiliary feedvater system via the separate and independent auxiliary feedring at such time as it is determined that this flow path should be initiated based on the operating conditions in effect at that time. When the steam generator water level has once again risen above the top of the main feed ring, the normal feed path using the nain feed vater system vill be permissible. 1221 064

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