L-80-389, Forwards Info Re Air Lock Leakage Testing Per 790312 Request
| ML17340A441 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 11/26/1980 |
| From: | Robert E. Uhrig FLORIDA POWER & LIGHT CO. |
| To: | Varga S Office of Nuclear Reactor Regulation |
| References | |
| L-80-389, NUDOCS 8012020079 | |
| Download: ML17340A441 (11) | |
Text
REGUL'A "RY INFORMATION DISTR IBUT I 'YSTEM (RIDS)
ACCESSION NBR: 8012020079 DOC ~ DATE: 80/11/26 NOTARIZED:
NO FACIL:50"250 Turkey Point Pil anti Uni t 3i Fil orida Power and Light C,
50 251 Turkey Poiint Pl anti Uni t 4i F>>l or i de Power and L>>i ght C
AUTH ~ NAME.
AUTHOR AFF>>ILIIATION UHRIGi R ~ E ~
F>>loride Power L L,ight Co.,
RECIP,NAME REC>>IPiIKiViT AFF ILiIATI ON VARGAiS ~ AD Ooerat.ing Reactors Bra'nch 1
SUBJECT:
Forwards info>> re aIir lock leakage test ing per 790312 requests
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FLORIDA POWER 5 LIGHT COMPANY November 26, 1980 L-80-389 Office of Nuclear Reactor Regulation Attention:
Mr. S.A. Varga, Chief Operating Reactors Branch ¹1 Division of Operating Reactors U.S. Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Varga:
Re:
Turkey Point Units 3
8 4
Docket Nos.
50-250 8 50-251 Air Lock Leaka e Testin The information requested in, a NRC letter dated March 12, 1979 concerning the above subject is attached.
Very truly yours, Robert E. Uhrig Vice President Advanced Systems 8 Technology REU/PLP/md Attachment cc:
J.P. O'Reilly, Region II Harold F.
Rei s, Esquire oo/
5 s/z 8 0/2080 PEOPLE... SERVING PEOPLE
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USNRC INFOIQ1ATION REQUEST DATED MARCH 12, 1979 ATTACKiENT 1 Item 1 The actual vacuum value to be'used in the testing of personnel air locks.
The test will begin at a absolute pressure of 12.92" Hg (17" Hg vacuum) and alarm if pressure increases to 14.42" Hg (15.5" Hg vacuum).
Item 2
The method to be used for the extrapolation of testing results to a leakage rate at the accident pressure.
Res onse 2
To determine the leak rate at 50 psig (64.7 psia),
the design basis accident pressure, the following derivation was used:
Flow for a compressible fluidmay be calculated as follows:
F =.K Y~hP (1) where F = Flow or leakage K = Coefficient of resistance Y = Expansion factor AP = Pressure drop across seal The maximum value for Y is 1.0 and calculates the leakage for a non-compressible
'fluid.
The coefficient of resistance is constant for each seal tested.
Therefore:
F=K AP or L = K ~DP A ratio between the leak rate at Lpp and L becomes:
test LGO K
P64,.7 P14. 7 L
K Py4 7 P LGP = L P64.7 P14.7 14.7 Ptes where P64 7= 131.73" Hg P)4.7
= 29 '2" Hg LGP = L 131.73 29.92
- 29. 92 Ptest Chemical Engineer's Handbook, NcGraw-Hill, Inc.,
1963 Section 5 (Fluid Hechanics, Flow Heasurement)
Pages 5-8
& 5-9
QSNRC INFOR'IATION REQUEST DATED IIARCH 12, 1979 ATTAC19IENT 1 PAGE 2
Res onse 2 cont.
LSP
=
102.52 29.92 Ptest
~'SP
= 10 13 Ltest 29.92 Ptest with pressures in inches of Hg item 3 A discussion of the bases on which the leakage limits for a vacuum pressure test were established.
Res onse 3
The set points for. the vacuum test system are as follows:
P
= 12;92" Hg'1%
14.42" Hg
+1%
fail T = 1 minute
+1%
These values are set by the vacuum pump and timers to be used.
To calculate the actual leak rates involved, the following derivation was used:
= Pressure 9 the beginning of the.test 8 tI ("I(g)
P2
= Pressure (I the end of the test 9 t2 ("Ilg) t = Time interval during test
= t2 tI (minute)
TI = Temperature 9 tI, PI ('R)
T2 = Temperature 9 t2, P2 ('R)
MI = Mass of contained air 8 tI, PI (lb m)
M2 = Mass of contained air 9 t2, P2 (lb m)
V = Volume of annulus between 0-ring -.(cc)
Z, =
% leakage per interval of time (%/min)
L = Change in volume per interval of time (cc/min)
R = Gas constant
= 53.35 ft lbf/ibm'R from III M2 x 100 MIt PIV = MIRTj P2V = M2RT2 substitute PIV P2V RT)
RT2 PIV t
RTI x 100
USNRC INFORMATION VEST DATED MARCH 12, 1979 ATTACHMENT 1, PAGE 3
Res onse 3 cont.
equation Ql 100 T
P T
P "ZxV let I =
100 equation 5
2 V
L = t T
P 1-T P.
equation Pr3 For a test time (t) of 1 minute, T
= T V
P L = t 1
Pl pe sonnel airlock L = 27.0 cc/min. at a leak rate test pressure of 12.92" Hg.
L TEST 50 29.92 P TEST 10.1 27.0 69.47 cc/min at a leak rate test pressure of 64.7 psia emergency airlock 65cc
~12.92" H )
l..min 14.42" Hg J L = 6.8 cc/min at a leak rate test pressure of 12.92" Hg.
L50 = 10.13 29.92 P TEST y 6.8
=. 10.13 (
29.92 14.42
= 17.50 cc/min at a leak rate test pressure of 64.7 psia.
Safety Factor due to 1% instrument error.
Assumption is that instruments have a
1% error showing a smaller than actual leak rate.
260 cc g P
12.79$
personnel airlock L =
.99min]
Q 14.56)
L = 31.93 cc/min,at 12.79" Hg L
= 10.13 29.92 12.79
= 78.15 cc/min at 64 '
psia
USNRC INFO ION REQUEST DATED MARCH 1 2 g ATTACHMENT 1, PAGE 4 Therefore total
% error would be 69;47 78.15K
) x 100 error
=
69.47
= 12.5%
(65 cc 5 (
12.79 Emergency airlock L =g.99min) h 14.56
)
= 7.98 cc/min at. 14.56"'g.
( 7.98 L50 10 13 ) 'j29 92 14 56
= 20. 63 cc/min at 64. 7 psia.
Therefore Total 0 err'or would be Error
=
17.50 20.63 x 100 17.50 17.89%
Therefore, the leak rates with maximum error per instrument are 78.15 cc/min for the personnel airlock and 20.63 cc/min for the emergency airlock.
These limits are well below the acceptable allowable local leak rate of 0.250% wt/day or 45,000 cc/min.
ATTACHVENT 2 Additional Information Hr. Earl Brooks, USNRC Inspector, requested several low pressure tests to be conducted on Turkey Point Plant's personnel airlocks.
On January 22, 1980, 0.2 psig was applied between the outer door "0"-ring seals.
A pressure decay test was used to determine if leakage occurred at low pressure.
Thirteen (13) minutes were allowed and no leakage was observed.
The Heise gauge used indicates in hundredths of a psi.
Pefer-ence Data Sheet 1.
On February ll, 1980, during the personnel airlock strong back test, four low pressure decay tests were performed using the same LLRT pressure equip-ment (with the calibration data given on the data sheet for the 0.2 psig decay test).
No leakage was observed from the airlock through either of the "0"-ring door seals.
Reference Data Sheet 2.
The automatic vacuum leak detector was used to verify the results of both tests,.
The vacuum leak detector certified that both sets of "0"-ring seals were leak free.
DATA SHEET 1
Fl~~ida Power 8) Light Compa Turkey Point Plant LOCAL LEAI< RATE TEST DATASHEET UNIT NO.
COMPONENT(S) TFSTEO PCNeTAAT)ON No.
SVSTCrvl
>PI"SC J
.=
1~ r"WC I;:5 cr /ll
\\-'otv Comereion C"ctor: Lotv =
/rt cc/mtn ncr %
A,IG NO.
High"-M ~
cc/min per%
PAOCKOURK No 0.00 Tl)VIE
{Hr5 Mein)
/ Fdz>
PRESSURE
{PSIAI
/4 fd TEMP
{OF)
AAT TAT FLOtt/ INDICATOR READING
/
~P/'cc/min or HIGH LON FLOVJ cc/min 0)5 gy/9 0-3 060 INSTRUMENT DATA PRESSURE INDICATOR
. FLOVJ INDICATOFI Manufacturer Model No.
I 8c C No.
Calibration Date Eieise 100 PSXA CÃf 22699 PTP 10002 12-11-79 Bxooks Ro tame ter 1110-05P191Z 1110-olrlalZ 771lkkl)3609-1 7808EI58872-1 PT 10008 PTP 10006 2-09-78 2 09 78 Tested by
- .Approved by J
'.catk5'.
n,+
AAT - Ambient AirTentgerature TAT - Test AirTemnerature Am Date
/
r Date I
i4 INd Form 5426 tNoi)-stoc)ced) Rev. afl
I @Qp FLORIDA POlVER Za LIGHT Coh1PANY INTER-OFFICE CORRESPONDENCE DATA SHEET 2
Russ Gouldy
~ocn YION FPL Turkey Point.
DATE February 12, $980 FROM BillHaley COPIES TO PERSOiiHEL ATR LOCK LOU PRESSURE THSTXMG On February ll, 1980 the Unit 4 Personnel Aix Lock eras pressurized to four.(4) different pressures up to 2psi in approximately 1/2 lb increments.
Each step xras monitored for ten (10) minutes.
No pressure decay was noticed at any pressure.
The following is a list of times, pressures (PSXA) and temperatures monitored:
Time 1400 1410 1420 1430 1435 1445
.1455 1505 Pxessure (PSXA) 15.22 15.72 16.21 16.72 Test Air'cm er'ature 65 F
66 66 66 Bill Haley PTP Technical Depaxtment pGO~c)M A~/
~ X'Tk)w S>>+ ~
'THIS WG'6'7.
P e.zD y~Y COURTESY NIHS FRIENDS...FQR FLoRIDA...FQR YQUR corhPANY...Foft YQU.