ML19323B425

Forwards Results of Analysis of Containment Vent & Purge Sys Large Isolation Valve Operability,Provided by Fisher Controls Co.No Limitation of Valve Opening Is Necessary

ML19323B425
Person / Time
Site:	FitzPatrick
Issue date:	05/06/1980
From:	Early P POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	Ippolito T Office of Nuclear Reactor Regulation
References
JPN-80-26, NUDOCS 8005120358
Download: ML19323B425 (8)

Text

=- - - . _ _ _ _ _ _ _

80051A0 368 i

POWER AUTHORITY OF THE STATE OF NEW YORK to CoLUMaus CIRCLE NEW YORK. N. Y. loo 19 GroaGE t sEmmy 4212) 397-6200 UpanavI=a creIc'an TnusTErs JCHN W. SCSTCN JOHN S DYSON ess et ?e etctoe

• **'" C"*"*"8 GEORGE L ING ALLS vaca CMaf 4M AN JCSEPH R. SCHMIECER P El CR 4 CwitP mtCHARD M. PLYNN ROBERT 4 MILLO N n May 6, 1980 LE=ov w. smetain ratoEnic< a clan < JPN-80-26 "cT.". E1'c1'

C F FIC E R

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& GENE 44bCQWNSEL Director of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Attention: Mr. Thomas A. Ippolito, Chief Operating Reactors Branch No.3 Division of Operating Reactors

Subject:

James A. FitzPatrick Nuclear Power Plant Docket No. 50-333 Containment Purge and Vent System Isolation Valve Operability

References:

1) Letter, Darrell G. Eisenhut (NRC) to All Light Water Reactors dated September 27, 1979

2) Letter, Thomas A. Ippolito (NRC) to George T.

Berry (PASNY) dated October 22, 1979

3) Letter, Paul J. Early (PASNY) to Thomas A.

Ippolito (NRC) dated November 26, 1979

4) Letter, Thomas A. Ippolito (NRC) to George T.

Berry (PASNY) dated December 19, 1979

5) Letter, Paul J. Early (PASNY) to Thomas A.

Ippolito (NRC) dated February 29, 1980

6) Letter, Pa'11 J. Early (PASNY) to Thomas A.

Ippolito (NRC) dated March 19, 1980

Dear Sir:

Enclosed are the results of an analysis of Containment Vent and Purge System large isolation valve operability conducted and provided to the Authority by Fisher Controls Company. Fisher conducted this analysis with consideration of the operability guidelines provided by the NRC letter of September 27, 1979 and after having met with the NRC. The analysis results show that no limitation of valve opening is necessary. The enclosed in-formation is the result of the " consultation with the valve supplier" required by the NRC letter of October 22, 1979. Thus, the Authority l

[o3'/s di l

l l

)

is in compliance with the NRC Interim Position 2a contained in the October 22, 1979 letter.

Discussion of Results Fisher has used a simplifying and very conservative assumption that the total containment pressure is seen across each isolation valve and that it is seen throughout the valve travel from fully open to closed. Consideration was given to LOCA induced stresses in valve parts and the ability of valve operators to overcome resisting torque.

Drywell The temperature (2850 F) and pressure (39 psig) used in the analysis of valves in lines coming from the drywell envelope all values obtained from the most recent analysis of containment response to DBA for the duration of such an accident.

The lowest maximum allowable differential pressure for protection i

of valve internals identified is 40 psid. Table 1 shows that sufficient operator torque is available for closure. Therefore no limitation on valve travel is required.

Suppression Chamber The pressure (22 psig) used in the analysis of valves is the lines coming from the suppression chamber is that obtained from the most recent analysis of containment response to DBA at 8 seconds into such an accident. Required closure time for these valves per the Technical Specifications is 5 seconds. The peak suppression chamber pressure over the first 30 seconds of a DBA is approximately 27 psig. The lowest maximum allowable differential pressure for protection of valve internals identified is 48.7 psid. Therefore, valve integrity is assured. The torque requirement analysis indicates a large margin of available torque vs required operator torque for a LOCA differential pressure of 22 psid. It is expected that available torque would be sufficient for closure even against 27 psid. The assumed suppression chamber temperature of 270 0F is conservative.

Conformance with NRC Interim Position of October 22, 1979 As indicated in the Authority's letter of February 29, 1980, step have been taken to minimize the use of purge and vent valves.

(NRC Condition 1) I l

This letter and the enclosure show compliance with NRC Con-dition 2a.

_ - - . - ~ _ - . _

- . _ . .-~ - - - . _-_ _- - - - . - _ - . . _ _ - _ _ _ _ _ _ _ _ _ _ _ . __

1 . .

t 3-l l Regarding NRC Condition 2b, the only area of disagreement l relates to the JAF Emergency Manual Override which the Authority i has committed not to use without prior NRC approval. The Authority i is concerned that the NRC position (1) does not take into account j the separation of override logic for redundant isolation valves I and that (2) unquestioned compliance with the NRC position may preclude post-LOCA purging which is part of the design basis for

JAF. The Authority has provided a substantial amount of information I on the override feature in our letter of March 19, 1980 responding j to the request for additional information in the NRC's letter of l

December 19, 1979. We suggested, at that time, a meeting to discuss this information and we now reiterate that suggestion.

I Very trul ,y yours, la l Q..

s. ..

/

/ /, LL A i Paul J. Early Vice Presiden and Assistant

,i Chief Engineer-Projects I

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j FISIIEli CONTROLS COMR\NY j .\l.\lbil.\LI. TOW.N. IOW.\ Mt.M avtcuarc c e=*=ot a tu+=s =f s.=es i eo I'

26;'y to: FISHER ccNTrot,$ ccv.*ANY. R A. En dl ?<c%c si c, -*vr. 7 o. ios i t, uz u .ats.s.'s s .. ~

April 22, 1980 l

i l

4 Power Authority of the State of New York i 10 Columbus Circle New York, New York 10019 E

Attenti:n: Mr. Paul Rcichert

Subject:

James A. Fitzpatrick Nuclear Pcwer Plant Containment Vent and Purge Isolation Valves 21" 9222 Butterfly Valves; 3/N: BF171050 thru 53 20" 9222 Butterfly Valves; S/N: EF171054 thru 57 Gentlemen:

1. Attached is the analysis printout data substantiating the capability of the subject valves to elese from the full open angle of 90* against the stated LOCA conditions for each size valve. A brief cy.planation of this analysis folle.ws:

a. The horizontal colu=n labeled "EP" shows the allowable d.f ferential pressure across the valve, for various opening, angles. (listed at the bottom of the page) for the valve construction.

Note that for the 20 inch valves, the allowable differential pressure for all angles of opening are greater than the accident condit ion of 22 psid. The sa.'e is true for the 24 inch valves with an accident condition of 39 psid. Therefore, both the 20 inch and 24 inch valves may continue to operate at a 90* open angle.

b. The actuator torque listings provided on the printout sheets do not apply because these torque values are for the =aximum allowable aP values at each angle. The appropriate torque values for ficw into the place valve disc were manually calculated using the specified LCCA differential pressure conditions.

c. The analysis for the 20 inch valves was done using material strength values far 270* rather than the identified LOCA c ndition of 115'F.

This dif ference in temperatures does not have a significant effect on the autput for this case.

2. These valves are provided with Bettis actuators with an air operation signal of 90-120 psig. With this air signal range in mind, the 20 'ach valves Sh.uld have a 3ettis type 732C-SRS0 actuator and the 24 inch valves should j have a Bettis type 733C-SR80 actuator.

4 d if FLCa$ fa#CCGM P'PE . . CnawCES &#t it'S C0'etDLLf 3 87 {ky, 2;g itLEPCNE +515i '54-30:1. . rat 910 5201420 . . ?ttu 47Pt!6

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a. The torque requirement for the 20 inch valves are calculated to be 3,831 in.-15 torqse required at o' and 5.613 in.-lb. at 90*. The Ecttis cat 21og data indicates an available actuator torque of 8,200 in.-lb. at O' valve opening and 16,400 in.-lb. at 90* valve

] opening for a Bettis type 732C-SRSO actuator. This indicates that the

! stated Bettis will be adequate to close the 20 inch valve in the case of a LCCA condition.

b. The torque requirements for the 24 inch valves are listed for each 10* valve increments in Table 1. These torques are based on a 39 psid dif ferential pressure across the valve. The available actuator torque values for the Bettis type 733r R80 actuator are also listed in Table 1. These available torques are based upcn the published data i a: 12,900 in.-lb. at 0* ar.d 25.700 in.-!b. at 90' alcnz vith a graph j showing approximate torque vs. valve rotation for spring return actuators. It is noted that the available torcue always exceeds the total calculated torque required through the complete rotation of the valve. Therefore, f rom a torque consideration, the valve can safely close from a 90* posit 1on during the LOCA condition of 39 psid.

3. It should be noted the the subject valves are capable of closing frcm fully open due to various factors. The LOCA conditions of 39 psid dif ferential pressure at 285'F for the 24 inch valves and 22 psid dif f erential pressure at !!5'F for the 20 inch valves are not as severe of _ -- as some that Fisher has previously investigated. The subject valves are constructed with higher strength shaf ts which allow higher stresses due to LOCA 4 condit ions . A plate disc is used for each valve allowing for lesser dynamic torque ef fects at larger angles than that for a cast disc. These major

! factors allow the subject valves to close from fully open rather than requiring a maximum valve opening of less than 90* as has been the case of

some other nuclear containment vent valves.

I i

i 4 This should answer the questions that you had about the subject valves.

Sincerely, FISHER CONTROLS COMPANY f _.,M3M 1

, / '7-va r m i ,- >

, .. :q

! David L. Cerny ,/

Design Engineer i

. DLC:km j

Encl.: 1. Analysis Printout for S/N: BF171054-57, P-96940-05/08, lated 2-7-80, 1 page ,

2. Analysis Prinout for S/N: 3F171050-53, P-96940-01/04, dated 2-7-80, I page.

ec - Larry Fleetwood l Dick Baumann i

- --. .- - - - .- .,-=_ - - - , - -- - h.--

Table 1: Angle of Opening ','s. Allevab l e Prescure Differential for 2 4" 9200 containment Ventti, tion Valves S/N 171050, 51, 52, & 53 REQUIRED ACTUATOR APPROXIMATZ ACTUATOR A!:CI E 'P TrMt'E (IN-L3)" TC P.f r_'E W A II.A.H.E ( I!,*-I.3 ) *

• O --

8 , '. A d 12,900 10 74 i,;0t I!,223 20 7; 6,63M 10.191

0 74 6,658 10,191 4J 74 6,638 10.955 30 74 8 , ',7 8 11,610 60 62 11,452 13.545 70 41 13,196 15,430 80 40 15,561 19,350 90 40 15,561 25,700

= Sized using 39 psid dif ferential pressure

• • Actuator torque values are for a Bettis 7 33C-5R30 i p,g g W 9'TMg ljg gs A ND k s

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