ML19242B333

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Submits Analyses of Probable post-LOCA Flow Conditions Across Containment Purge Valves,For Use in Evaluating Valve Operability
ML19242B333
Person / Time
Issue date: 07/10/1979
From: Lainas G
Office of Nuclear Reactor Regulation
To: Reeves E
Office of Nuclear Reactor Regulation
References
REF-GTECI-B-24, REF-GTECI-ES, TASK-B-24, TASK-OR NUDOCS 7908080106
Download: ML19242B333 (7)
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{{#Wiki_filter:jff J' } f c j: I'.'. }: JUL 101979 s i I -:.3. ::.- MEMORANDUM FOR: E. Reeves, Lead Engineer, Operating Reactors Branch #1 3=s= .f{f~.~~ Division of Operating Reactors FR0ri: G. Lainas, Chief, 91 ant Systems Branch, Division of F - Operating Reactors I

SUBJECT:

CONTAINMENT PURGING GENERIC TASK B-24 g.. Enclosed are our analyses of the probable post-LOCA ficw conditions [:.: evaluating valve operability. The maximun differential pressure f across containment purge valves for use by the Engineering Branch in ii across the containment purge valve in the BWR analy;:ed was found to F be 45 psid. PWR valves were found to experience a maximum i differential pressure of 38 psid. These specific differential pressures F are plant specific and should be providt d by the licensees if it is an important parameter in your evaluation. l;l= G. Lainas, Chief Plant Systems Branch Division of Operating Reactors ,c -

Contact:

J. Kerrican r. -- - X-27110 ~ [1 - y-

Enclosure:

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ENCLOSURE ANALYSES OF POST-LOCA FLOW CONDITICNS ACROSS CONTAINMENT PURGE VALVES A sensitivity study was performed using the CCMPARE code to find the most probable limiting flow conditions which could exist across the containment purge valves after a DBA. Flow conditions in both a BWR (Peach Bottom) and a PWR (Trojan) were simulated. The sensitivity of the response to valve size, vent length, valve closure time, Moody flew multiplier, valve closure initiation time, and one isolation valve failed open were examined. The valve size (36" and 72" for the PWR's and 18" and 24" diameters for the BWR's) was found to have no influence on vent flow conditions. The diffe crces in flow conditions between the BWR and the PWR valves are due to di ?ferences in the containment back pressures. Two vent piping lengths (5 and 10 feet) were simulated to examine the effect of inertia on flow conditions. The results of these cases indicated that inertial effects could be neglected. l Valve closure times of 2, 5 and 10 seconds were simulated. The largest valve differential pressure occurred with a closure time of 10 seconds. The r ate of increasing differential pressure was largest with a valve closure time of 2 seconds. r Two values for the Mcody flow multipler,1.0 and 0.6, were u ed and were fcund to have no appreciable effect en tne vent flow conditions. Calculations were performed in which one of the two containment isolation valves in a line was simulated as being failed open. This caused the differential p essures across both tne BWR and PWR valves to increase by 50%. Cases were run in which valve closure was nct initiated until containment pressure tripped the isolation signal (PWR a' 4 psig; BWR at 2 psig). Centainment pressure trioced the signals very shortly after initiaticn of bicwacwn. This time delay centric'uted insignificantly to tne nominal vent flow conditions. Table I summarizes the cases which were run during the sensitivity portian of this task. Generic assumptions used in all analyses were: 1. Valves closed at a ccnstant rate.

/ y, r-a u -

, For butterfl valves, angle-dependent Idel'ch ik loss 2. ccef ficients{ were used, K=exp (1.039 - 1.66). 3. The entrance loss from containment into the purge line was set to 0.78; the exit loss from the purge line to atmosphere was set to 1.0. -- n 4. Only one vent line~ was modeled for conservatism in dynamic loading on the valve. 5_. Tha vent line was assumed to be a straight line of piping connecting the containment with the outside atmosphere. Conditions in the ventupiping upstream of the valve were found by letting the upstream stagnation volume consist o# the containment (vent piping entrance loss =.78). The downs tream stagnation volume consisted of the vent piping downstream of t,e valve and the outside air (vent exit less = (Idel'chik K - 1.0)). Conditions in the vent piping dcwnstream of the valve were found by performing an adjitional calculation in which the upstream stacnation volu a consisted ci the containment and the vent piping upstream of t e valve ' vent entrance loss ~ = (Idel'chik K + 0.78)), the downstream stagnav on voiume. consisted of only the outside environment (vent exit loss = 1.0). The attached figures summarize the most limi, ting flew conditions for both the EWR and the PWR examined. The SWR case is for an 18" valve (results identical to 2d" valve) with one isolar en valve f ailed open, a valve cicsure time of 10 seconds (initiated

a. start ;f blowdown), and a Moody flow multiplier of 0.6.

The PWR case i, for a 72" valve with cne isolation valve failed coen, a valve closure time of 10 seconds (initiated at start of blowcown), and a Moody ficw multiplie-of 0.6. The differential pressure across the valve is plotted in Figure 1. The grachs were terminated when the valves ccmpietely closed. After this time, only a static pressure differential exists acrcss tne valve. Impi n gemen t forces on the valve can be found by using Figures 2 and 3 which grachically show the fluid velocity and density in the vent piping ucstream of tne isolaticn valve. I I.E. Idel'chik, Handbcok of Hydraulic Resistance Ccefficients c' uccal Resistance and of Frictier., r:L .n-co0, United States Clearinghcuse for Federal Scien!'fic and Tecrr.ical Information (1966). t b bc > ~

TABLE I - SENSITIVITY STUDY

SUMMARY

BWR Valve Inertial Moody Valve No. of Initiation of Case Size E f fec ts Multiolier Closure Time V a l '. - Valve Closure 1 18" 0 0.6 5 2 blowdown 2 24" 0 0.6 5 2 blowdown 3 18" 0 1.0 5 2 blowdown 4 18" 0 0.6 2 2 blowdown 5 18" 0 0.6 10 2 bl owdown 6 24" 0 0.6 10 2 blowdown 7 24" 5' O.6 10 2 blowdown 8 24" 10' O.6 10 2 blowdown 9 18" 0 0.6 5 1 blowdown 10 18" 0 0.6 10 2 containmen t pressure =2 psig 11* 18" 0 0.6 10 1 olowdcwn PWR 1 36" 0 0.6 5 2 blowdcwn 2 72" 0 0.6 5 2 bicwdown 3 72" 0 l.0 5 2 blowdown 4 72" 0 0.6 2 2 blowdcwn 5 72" 0 0.6 10 2 blevdown 6 36" 0 0.6 10 2 blowdown 7 72" 5' O.6 10 2 blcwdcwn 3 72" 10' O.6 10 2 bl cwdcwn 9 72" 0 0.6 5 1 ol owdcwn 10 72" 0 0.6 5 2 con tai nme3t. pressure = psig 11

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