ML19253C902
| ML19253C902 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 08/31/1977 |
| From: | COMMONWEALTH EDISON CO. |
| To: | |
| Shared Package | |
| ML19253C898 | List: |
| References | |
| DTS-1600-6, NUDOCS 7912120327 | |
| Download: ML19253C902 (61) | |
Text
,
Unit 1 N
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DTS 1600-6 Revision 2 INTEGRATED SPHERE LEAK RATE TEST August 1977 A.
PURPOSE The purpose of this procedure is to determine the overall leakage from the sphere.
B.
REFERENC~S 1.
Dresden Nuclear Power Station, Unit 1 Final Hazards Summary Report.
2.
10 CFR Part 50, Appendix J, January 1975 - Primary Reactor Containment Leakage Testing For Water-Cooled Power Reactors.
3 ANSI N45.4-1972 - Leakage-Rate Testing of Containment Structures for Nuclear Reactors.
4.
Bechtel Corporation Topical Report BN-TOP-1, Revision 1, November 1972 - Testing Criteria For Integrated Leakage Rate Of Primary Containment Structures For Nuclear Power Reactors.
],
5.
Bechtel drawings:
a.
142F288 b.
142F289 6.
Data Reduction & Error Analysis For The Physical Sciences, Phillip Bevington McGraw Hill.
7 Chicago Bridge & tron Company Report:
Leakage Rate Determination C.
PREREQUISITES 1.
A signed and dated events log must initiated by the respon-sible Tech Staff Engineer and will be kept up to date at all times by the Cognizant Engineer on shift.
2.
A familiarization by Tech Staf f personnel of all regulations, standards, and procedures applying to the ILRT including, but not limited to, those listed in REFERENCES.
3 All local leak rate tests on valves, seals, and penetrations of the primary containment must be completed before the ILRT can begin.
NOTE Local leak rate tests must b'e done prior ki to and af ter any repair work being done on any penetration or associated isola-1542 002 tion valve.
In the special case of double gasketed seals, local leak rate tests must be done prior to opening the seal and af ter closing the seal.
1 7 91212 0 3 d-
Unit I
+
DTS 1600-b Revision 2 4.
All pre-test checklist must be completed and returned to the
.((
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responsible Tech Staff Engineer prior to the start of the test.
NOTE The work to be performed in these checklists involves various departments within the station.
It also involves items which may be scheduled months or more in advance of the test.
It is the responsibility of the cognizant Tech Staff Engineer to schedule the items and coordinate the work so as to facilitate the execution of the ILRT.
5 All Instruments to be used for the ILRT will be calibrated over the full range of expected use prior to their placement in the primary containment for each test.
The calibration must be in accordance with approved procedures.
6.
The primary drum water level as monitored on L1-6, Panel P-3 should indicate approximately 0 inches.
7 Contact the NEL - PIA Insurance Co. prior to performing
~
the test.
8.
Load and save the computer program on the computer if it t(
is to be used.
9 If it is desireable to have CPS available throughout the test, notify the Computer Systems Departmen't at least two weeks in advance.
10.
Prepare an instrumentation error analysis for the equipment used.
See the example in Appendix B, attached.
D.
PRECAUTIONS 1.
Varning signs shall be posted at ALL containment air locks.
ANY containment entry af ter pressurization has begun and prior to the test completion must have prior approval from both the Shif t Engineer and the cognizant Tech Staff Engineer.
2.
All station radiation protection and safety practices and rules will be strictly followed for this test.
3 All requests for equipment out-of-service for repairs during the test must be evaluated with respect to the fact that the primary containment will be under approximately 20 psig.
4.
Prior to performing any pressurization.of the primary con-(
tainment, Isolation of ECCS sensors is mandatory to prevent automatic actuation.
5 If use of the UNLOADING HEAT EXCHANGER is anticipated at anytime during the test, the pump may be run for the entire 1542 003 2
Unit 1 DTS 1600-6 Revision 2 C
duration of the test.
This is to avoid transients in the vessel water level. A minimum reactor head flange tempera-ture of 130*F shall be maintained.
Reactor water should be kept between 135'F and 140' if possible.
NOTE It is important to maintain the reactor water at a coastant temperature.
The unloading heat exchanger can be used for cooling and recirculation pumps can be started for heat.
DO NOT use heating steam to the unloading heat exchanger and avoid excessive cycling of recircula-tion pumps.
E.
LIMITATIONS AND ACTIONS 1.
The integrated leakage rate test will be conducted at the calculated maximum peak accident pressure of 20 psig. Time duration of the test pressure settings will be a minimum of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of continuous leakage rate measurements. Measurements as specified by the cogni: ant Tech Staff Engineer responsible for the ILRT will be taken at least once an hour.
2.
After the preoperational leakage rate tests, a set of three type A tests shall be performed, at approximately equal intervals during each ten year service period.
The third test of each set shall be conducted when the unit is shutdown for the ten year inservice inspections.
3 Successful completion of this test will obtain all of the data necessary to demonstrate the integrity of the primary containment consistent with all station, license, and Nuclear Regulatory Commission requirements.
a.
The indicated leak rate shall be less than Lto (75% Lp).
b.
The upper 95% confidence limit of the indicated leak rate, which includes appropriate consideration for random measurement errors, shall be less than Lp.
4.
Sphere pressurization will be discontinued if leakage above the maximur. allowable rate is obvious or the sphere pressure cannot be increased.
Repairs will be made and the test restarted.
k NOTE Before terminating ti.e test, a leak rate must be determined for reporting 1542 004 to the NRC if the leak rate is above Lp as defined in the Technical Speci-fications.
Unit i DTS 1600-6 Revision 2
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5 If the test is terminated due to excessive leakage, or if the calculated leak rate is above Lp, then a Reportable Occurence must be issued.
6.
During the period between the initiation of the con-tainment inspection and the performance of this Type A test, no repairs or adjustments shall be made so that the containment can be tested in as close to the "as is" condition as practical.
7 During the period between the completion of one Type A test and the initiation of the containment inspection for the subsequent Type A test, repairs or adjustments shall be made to components whose leakage exceeds that specified in the Technical Specifications as soon as practical after indentification.
8.
If during a Type A test, including the supplemental in-duced leakage test, potentially excessive leakage paths identified which will interfere with satisfactory com-pletion of the test or which result in the Type A test not meeting the acceptance criteria, the Type A test shall be terminated and the leakage through such paths shall be measured using local leakage testing methods.
Repairs and/or adjustments to equipment shall be made
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and the Type A test restarted.
The corrective action and the change in leakage rate determined from the tests and overall integrated leakage determined from the local leak and Type A tests shall be included in the report submitted to the Commission.
9 Closure of containment isolation valves for the Type A test shall be accomplished by normal operation and wi th-out any preIiminary exercising or adjustments.
Repairs of maloperating or leaking valves shall be made as necessary.
Information on any valve closure malfunction or valve leakage that requires corrective action be-fore the test, shall be included in the report submitted to the Commission.
10.
The containment test conditions shall stabilize for a minimum period of four hours.
11.
All vented systems shall be drained of water or other fluids to the extent necessary. to assure exposure of the system containment isolation valves to containment air test pressure and to assure that they will be sub-jected to the pos t-accident dif ferential pressure.
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1542 005 r
Unit 1 DTS 1600-6 Revision 2
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Systems that are required to maintain the plant'in a
(
safe condition during the test shall be operable in their nor N mode, and need not be vented.
Systems that arc.
really filled with water and operating under post-acci4.cc,c condi tions, such as the containment heat removal system, need not be vented.
12.
Results of the supplemental induced leakage test are acceptable provided that the difference between the supplemental test data and the Type A test data is within 0.25 Lp:
Induced phase total -
t.' 24 hr. phase + L suoerimposed ]
<.25 Lp L(calculated leak rate) [ (Calculated leak rate) (leak rate)
If results are not within 0.25 Lp, the reason shall be determined, corrective action taken, and a successful supplemental test performed.
- 1 3.'
A general inspection of the accessible interior and
=
exterior surfaces of the primary containment structure ' ' -
and components shall be performed prior to any Type A test to uncover any evidence of structural deteriora-tion which may affect either the containment structural integrity or leak tightness.
If there is evidence of b(
structural deterioration which may affect either the containment structural deterioration, Type A tests shall not be performed until corrective action is taken.
Such structural deterioration and corrective actions taken shall be reported as part of the test report.
14.
The integrated Primary Containment Leak Rate Test will consist of five phases.
Each phase will have a definite starting and ending point and is so defined because of the different types of activities that will occur in each.
a.
The preparation phase.
b.
The pressurization phase.
c.
The 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> leakage rate at 20 psig phase, d.
The induced leakage phase at 20 psig.
e.
The depressurization phase.
NOTE The signed and dated events log started
((.
by the responsible Tech Staff Engineer will'be kept up to date at all times by the Cognizant Engineer on shift during all phases of the test.
1542 006 5
Unit i DTS 1600-6 Revision 2 F.
1.
Test Preparation.
a.
Prior to starting the sphere pressurization, the pre-test checklists must be completed:
CHECKLIST DEPARTMENT VERIFIED 1
Maintenance 3
operations 5
Instrument Mechanics 7
Technical Staff
~
9 Rad. Protection Pre-test preparation complete.
.a
.,-,.__3,.-
s.
b.
Obtain the Operating Enginears approval for sphere pressurization.
2.
Pressuri za tion C.
Begin pressurizing the sphere.
a.
NOTE The Operating Department is responsible for maintaining and operating the air compressors.
b.
The operating personnel assigned to the air compressors will also check the air injection line for an explosive mixture on an hourly basis.
c.
After the system is at 2 psig, inspect all appropriate bellows, penetrations and valves for excessive leakage.
d.
If sources of leakage are found or containment instrumentation indicates excessive leakage, pressurization should be stopped and this leakage should be estimated, if repairs cannot be achieved without depressurization, the sphere should be vented to facilitate repairs.
k 1542 007 6
Unit 1 DTS 1600-6 Revision 2 NOTE
. C The results of the local leak rate test or the estimated leakage rate from all repaired leaks must be totaled and added to the results of the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> leak rate calculation to determine a lea.kage rate at the beginning of the test.
If this resultant leak rate is above Lp, an Reportable Occurrence must be initiated.
e.
When the system is at 5 psig, hold for review of the leak rate as referenced by pressure decay in-
- - ~
dications.
NOTE CLOSE the pressurization line isolation valves and vent the air receiver tanks during this period.
f.
Resume pressurizing the containment until a pressure of 20 psig is obtained.
b(
g.
CLOSE the pressurization line isolation valves and VENT the air receiver tanks h.
The pressurization phase is ccmplete after a MINIMUM of 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> at 20 PSIG.
Temperature stabilization may require additional pressuri-2stion until a balance is achieved.
NOTE A continuous monitoring of the containment penetrations should be maintained during the pressurization phase.
If any leaks are found, an estimate of the leak rate must be n-ade before any repairs are attempted.
Pressurization Phase Complete 3,
24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> leak rate at 20 PSIG a.
Check all accessible primary containment penetrations that exhibited Icakage at 2 PSIG with soap solution before the start of data taking.
Note any char.ges in apparent icak rate.
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b.
A dated log of events and pertinent observations will be continued during the test, and the correctness of data shall be attested to by those responsible for 542 008
Unit i DTS 1600-6 Revision 2 c.
Record the following data at least once every hour:
(1)
Time (2) Ambient temperature, pressure, and relative humidity.
(3) Absolute pressure of the primary containment (4) Air temperatures inside the. primary containment.
(5)
Dew point temperatures inside the primary con-tainment.
(6)
Primary steam drum water level and reactor water temperature may be moni tored for information only.
(May help explain any transients).
d.
Calculate using either the hand method (an example of which is in Appendix C or by computer, the following data at least once every hour:
(1)
Average Temp. by subvolumes (*F)
(2) Average vapor pressure by sub volumes (psi).
(3)
Average containment volume weighted temperature (*F).
L (4) Average containment volume weighted vapor pressure (psi).
(5)
Primary containment dry air pressure (PSI A).
(6) Mass of contained dry air (Ibs).
(7)
Measured leak rate (weight %/ day).
(8)
Linear least, squares fit leak rate (weight %/ Day).
e.
Record the information calculated in F.3.c. and F.3.d.
on data sheets of the type found in checklist 11 attached unless computer print outs are available.
f.
Plot the information in F.3.d as a function of time.
g.
Leakage rate measurements will be made at an average containment pressure over the time period of the test of at least 20 PSIG.
Data accumulation will continue for at least 24 consecutive hours.
h.
From the third data set to the 24th hour, the mass versus time data will be linear least squares fitted.
k 1542 009 8
Unit i DTS 1600-6 Revision 2 The result will be termed the statistically averaged
- (C leak rate.
(refer to Appendix C, attached, for hand method of calculation)
I..
Compare the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> leakage rate to Lt (0.3 WT %/ Day) and Lp (0.4 WT %/ Day).
Should the leakage rate approach Lt, every effort should be made to find the source of leakage.
Phase ), ends with the calculation of the 24th hourly set of information.
If Section E.3. is satisfied, phase 4 can begin immediately.
If not, the responsi-ble leaks must be repaired and the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> phase re-peated.
20 PSIG test phase success fully completed.
24 Hr. Indicated Leak Rate
%/ Day Verified 4.
20 PSIG Induced Leak Rate Phase Phase 4 is the induced leakage portion of the ILRT. During this test a deliberate leak of known magnitued will he super-imposed on the leakage rate already calculated during the 24 f
hour phase.
This will provide reassurance against any un-((
certainties associated with the performance of the leak rate k
test.
This leak should be of the same magnitued as the 24 hr. leak rate, if possible.
The induced phase leakage rate is then determined and should approximately equal the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> leakage rate plus the superimposed leakage rate.
This phase then acts as a verification of the accuracy of the data obtained in phase 3 a.
The suction to the flowmeter for the induced leakage should be taken from the temporary tap provided at the equipment hatch. A dehydration and particulate filter should be installed.
b.
Request that the Radiation Protection Department obtain an air sample.
This can be obtained from the discharge of the ILRT flowmeter. While obtaining the sample, maintain a flow rate approximately equal to the desired superimposed value.
c.
After the air sample has been taken, begin recording data as in step F.3.c. at least once every hour, in addition to the above data, record the induced leakage flow rate.
d.
Perform the calculations listed in F.3.d. at least every k
hour until sufficient data is obtained to adequately fulfill the appropriate criteria.
1542 010 9
Unit 1 DTS 1600-6 Revision 2 If the induced leak rate cannot be accurately detected,
, ((
an investigation of the cause should be made, corrective e.
actions taken, and an induced" leakage phase satisfactorily completed.
An evaluation and the corrective actions should be included in the report to the NRC.
Induced leakage phase completed Superimposed Leak Rate:
1440 MIN T + 459 69 *R 14.696 psia 100% =
WT%/ DAY SCFM DAY 60 + 459 69"R P + 14.696 psia V0L where i = induced phase average containment Temperature,
- F.
~
~ ~
P = induced phase" average containment dry air pressure, PSIA.
V0L = Free volume of the containment, F t.'
(see Appendix C, Section C)
Induced phase indicated leak rate:
WT t/ DAY nduced Phase 4 HR. Phase
+bSuperimposed
<.025(0.4) ndicated Leak Rate)
Indicated Leak Rat eak Rate
]
< 0.I
+
=
Verified G
1542 011 b
10
Unit I DTS 1600-6
~
Revision 2
(:
5 Depressurization Phase 5, the depressurization phase, can begin with the end of the successful completion of the induced leakage phase.
a.
Request Air sample be taken by Rad Protection.
Sample will be taken off of sample point in front of Turbin side of equipment hatch.
b.
Verify that the results of the air sample taken in
'tep A are below the allowable activity limits.
Slowly open 4" valve (at M-15) until a pressure of c.
~
5 PSIG is noted at the test connection.
(Pressure gage is located between isolation valves on 4" pressurization line.
This precaution is used to prevent over pressurization of the filters in the chimney.
d.
To achieve a higher flow rate for blowdown purposes use core spray piping:
(1)
Close plug valves on both strainers.
Open strainer backwash valves.
(2)
Open CS-16, then rack out.
(3) Manually fully open CS-17, then rack out.
e.
When sphere pressure reaches.25 PSIG:
(1)
Restore normal ventilation.
(2) After sphere pressure is at atmospheric pressure, take air samples:
CO (Rad Protection)
Explosive Mixture (Operator) f.
Secure Slowdown:
(1) Manually close CS-17.
(2)
Rack in CS-16.
Leave Open.
(3)
Open strainer backwash plug valves.
(4)
Close sphere pressure inlet valves in skirt and local leak rate test.
k-VERIFIED
}f)k 11
Unit 1 DTS 1600-6 Revision 2 Af ter air sample are results obtained and sphere is ready g.
-(.
)
for entry, with the approtal of the Rad Protection
(
Department, the first suosequent sphere entry will be by Technical Staff personnel.
The puroose of this entry is to note any deviation from original position of any instrumentation or fans used for the test.
Any deviations found will be noted and accounted for in the log book. Operators will Insure all high rad doors are closed and locked.
h.
Only after the Technical staff inspection will the instrument mechanics remove all test equipment from the primary containment.
~
I.
The responsible technical staff engineer should notify the shif t engineer of satisfactory completion of the test so that all equipment with altered position status can be returned to normal.
VERIFIED 6.
Post Test Checklist After depressurizing the sphere the post tess,3ortion of the following checklist must be completed:
G.
CHECKLISTS 1.
Pretest maintenance department checklist.
- 2. ' Posttest maintenance department checklist.
3 Pretest operating department checklist.
4.
Posttest operating department checklist.
5 Pretest instrument maintenance department checklist.
6.
Posttest instrument maintenance department checklist.
7 Pretest technical staff checklist.
8.
Posttest technical staff checklist.
9 Pretest radiation protection checklist.
10.
Posttest radiation protection checklist.
11.
Data Record Checklist.
Appendixes 1542 013 a.
Definitions of Terms b.
Instrument accuracy error analysis c.
Data analysis mathematics
O O
Unit 1 DTS 1600-6 Revision 2
~
H.
Tachnical Specification Reference
- 4. 7. A.1 C
l 1542 014 (L
13
Unit i DTS 1600-6 Revision 2
, (
MAINTENANCE PRETEST CHECK LIST 1 INITIAL 1.
Install air compressors, piping, coolers, and manifolds to existing penetrations. Also in-stall temporary lighting to permit night operation.
2.
Provide and install a means of blocking the air operated valves in the line from the poison tank to the reactor, closed.
3 Insure zero f reon leakage f rom the sphere air conditioning system.
4.
Prepare the sphere ventilation system for the test to prevent damage of the electric motors.
a.
Change the pulleys on the 10 ventilating units on elevation 529'.
Fans K 173, AK (Normal 6" pulleys - Test. 5" Pulleys.
b.
Change the pulley on the isolation cooling
(
unit in the unloading heat exchanger room.
(K-186) c.
Change the pulley on one exhaust booster (A) fan in the west decontamination room at elevation 502' (K-170 North West side of the sphere by the ceiling in the decon room) d.
Change pulley on the A pipe way cooling fan on elevation 565 NW (K-172 A, change from 6" pulley to 4" pulley) e.
Change pulley in the instrument and scanning rooms - location 570' south east area - South stairway to RX canal.
5 Install hose and piping in U-1 heating boiler house to provide fuel oil for air compressors.
k 1542 015 14
Unit 1 DTS 1600-6 Revision 2
- [(
MAINTENANCE POST TEST CHECK LIST 2 INITIAL 1.
Remove piping required for ILRT compressors.
2.
Remove blocks installed on the air operated valves in the line from the poison tank to the reactor.
NOTE Verify that the instrument air system has been returned to service first.
3 Change sphere ventilation system back to original condition.
a G
O L(.
1542 016 o
S e
15
Unit 1 CTS 1600-6 Revision 2 CHECK LIST lli OPERATING PRETEST CHECK LIST The operating group will be responsible for setting up the various systems as indicated prior to test. A caution card log shall be maintained in order to record valve changes.
s INITIAL 1.
The Reactor should be in a scrammed condition during the test with the reactor switch in SHUTDOWN posi tion.
This will allow scram valve disphragm to be vented to the sphere during the test.
Scrammed 2.
Verify that the poison system positive displacement pumps are not running. During extended running periods a large volume of boron solution could be lost due to pump leak off.
a.
Bring boron solution temp. to approx 120' F.
(
b.
Place external immersion heaters in the low pressure poison tank to ensure the solution temp. does not drop below 90*F.
3 Check to see that blocks are installed on upstream poison injection valve and on equalizing valve to prevent opening.
(See Itan (7).)
Injection valve blocked closed Equalizing valve blocked closed 4.
CLOSE instrument air supply valve to pressure receiver tank supplying poison system valve operators. Vent pressure receiver tank cerefully observe that no valves open.
Air supply valve closed
(,
Tank vented Poison valves closed 1542 017
Unit 1 DTS 1600-6 Revision 2
, ((~-
~
INITIAL 5
Verify closed Emergency Condensor sample valve Verify closed Emergency Condensor drain valves (3) 6.
Sphere closed cooling water head tank T-i20 is supplied with contaminated makeup water. The supply line shutoff manual valves at the tanks will be shut off, so that on loss of instrument air, flooding will not occur.
T-120 Makeup valves closed 7
Heating and cooling system head tanks T-116A & B are supplied with contaminated makeup water from "A" demin storage tank.
The supply line manual shut off valves at the tanks will be shut off so that on loss of instrument air, flooding will not occur.
T-116 A Makeup Valves, closed T-il6 8 Makeup t(
Valves closed 8.
OPEN emergency condenser vents S0-100 and 50-101 from the control rcom. Connect hoses to the vents and run them to a floor drain so that reactor water will not spill onto the floor.
9.
Close fuel transfer line & bypass.
M0542 M0541
- u. u. -...
Record reactor canal level 10.
The valves on the nitrogen bottles on the 565' level for the poison system are to be closed, bottles disconnected and checked for leakage.
Leaking bottles are to be removed f rom the sphere or capped.
Nitrogen bottles Leakage
(
11.
Instrument air is to be shut off to sphere and system vented.
Venting will be done in E in-('
strument room by removing a plug f rom the lines on the east wall.
}
SV-562 closed System vented
Unit i DTS 1600-6 Revision 2 12.
Service air will be shut off to the sphere and vented; the system should be vented at the service air station in front of E instrument room on the 548' level.
Check telitale for leaks.
SV 563 Vented 13 Drain and vent secondary steam generators.
If possible.
A.
NOTE:
Tube leaks may B.
make this impossible.
If impossible delete C.
this step.
D.
- 14. The heating system steam supply to the sphere will be shut off (Trackway) 15 Four Secondary Steam Generator Room Coolers off.
16.
Isolation cooling unit in unloading heat ex-changer room shut of f.
17.
Service water system is to renain in service.
in service
'8.
Reactor closed cooling water system (serving equip-ment, pipeway coolers, and reactor shield coolers) shall renain in service.
In service 19 Reactor shield coolers in service.
20.
Pipeway coolers in service with fan A running.
21.
Reactor shutdown cooling unit.ia service.
22.
Out-of-core ion chamber ventilating fan shut of f.
23 Doors to sphere rooms open.
(Check with Radiation Protection).
24.
Periphery cooling units on 529' elev. will all have fans running for air circulation.
Fans on manual 1542 019 18
DTS16bO-6 Revision 2 INITIAL 25 S.phere air conditioning system is to be shut down.
(,
Circulate wate.r one hour and shut off pumps on systems No. I and No. 2.
G-135A & B G-136A & ".-
26.
Shut down sphere service water pump (cleandemin)
G-159 27 Close 2" sump drain f rom reactor canal (unloader room) 28.
Open.
Secondary steam gen. blowdown valves.
NOTE:
M0537 If there are tube leaks in M0538 the secondary steam generators these valves may be closed at M0539 the Shift Engineers dis-cretion M0540
~
29 In "A" cleanup pump room closn resin transfer pump suction from demineralizer.
C 30.
Open telitale on suction line.
31.
Accumulators will be bled off and the air re-ceiver will be bled off and isolated. The air can be bled out of the 1/2 inch drain valve at the bottom of the accumulators.
There are two valves in the line from the air receiver to the two banks which can be closed to isolate it.
It can be bied off through the drain.
~
Accumulators Receiver Close inlet to CRD Feedwater filters B.
a.
Close the manual inlet and outlet isola-tion valves to the control rod drives.to
(
prevent loss of water from reactor.
32.
The Post incident system sphere valves on the
}f)42 020 478' level are to be open; these are two eight inch valves under the floor.
Valves open
Unit 1 DTS 1600-6 Revision 2 33 REDT tanks are to be empty at start of test, if possible. Otherwise, record level prior to and following testing.
REDT East REDT tiest Open cross tie valves between "A" a.
and "B" REDT's.
34.
Close.
Personnel hatch A responsible person will be Equipment hatch stationed at each entrance to the reactor containment.
(Sphere side door only)
Escape Hatch CAUTION Verify all personnel are.out of sphere.
35 Vent the heating system steam supply to the
(
sphere through a service station in the sphere and then close M0 522.
Manual Valve closed 36.
Insure primary steam lines are drained.
37 Then set the folicwing valves in turbine pipeway.
Open North & South Drain Valves a.
b.
Open drain tie valve Close primary steam drain to condensor valve c.
d.
Close Primary Steam drain to blowdown tank valve.
Open test connection next to FCV 365 e.
NOTE
- b., c., d., have reach rods in trackway or entrance to pipeway.
(
VALVE GALLERY 1542 021 38.
On secondary feed system set the following valve.
a.
Close E sec. HTR cutlet valve b.
Drain water between E secondary HTR and
...n
Unit 1 DTS 1600-6 Revision 2 INITIAL
. (
Open vent between E outlet and MO 8 c.
d.
Close D inlet e.
Close C Inlet f.
Open Header drain g.
Close B & C bypass Leave primary feed system valves as is.
POST INCIDENT & CORESPRAY AREA 39 Rack out post incident pumps.
CAUTION Assure that steps G.3, L, & 5 of the operating pretest checklist are done (block closed poison valve injection and equalizing valve, reactor cooling head tank manual valves and reactor closed cooling water head. tank manual valves are closed) before isolating Ins trument Air.
/
40.
Instrument Air manual valves.
Close manual valve on compressor side of SV 562 I
a.
b.
OPEN vent on compressor side of SV562 c.
Verify sphere side manual is OPEN d.
Verify sphere side vent is CLOSED.
41.
Service Air manual valves Close manual valve on compressor side of SV 563 a.
b.
OPEN vent on compressor side of SV 563
'c.
Verify manual on sphere side open d.
Verify vent on sphere side closed Open drain on heating steam line in sphere skirt area.
42.
Close the foll'owing valves in corespray post in-cident area (See PC 10 M-595)
(A strainer backwash manual)
CS 118A500 a.
b.
("B" S trainer backwash manual) CS 1188500 1542 022 2'
Unit i DTS 1600-6 Revision 2 c.
Crosstle bypass CS 306-500
(
CS 307-500 d.
Drain tie manual CS 303-500 CS 304-500 e.
Tie valves to radwaste from Post incident system (Under floor.
2 valves 43 Doors to pipeways from secondary steam generator rooms and at emergency condenser elevation open.
44.
OPEN following valves in core spray Fost incident area.
a.
Manual isolation valves for Post incident.32-501 33-501 45 Check fuel pool level before test start.
46.
The follcwing isolation valves shall be set as follows in the Control Room and verified locally -
PANEL B-3 a.
Close Secondary Steam Generator Sampling Line.
M0-529 MO-532 M0-533 MO-534 FCV-510 b.
Close secondary steam upstream M0-163 M0-161 M0-165 MO-159 c.
Close Filtered water to canal A0-513 d.
Close secondary steam drain FCV 517 FCV 518 FCV 519 1542 023 FCV 520 e e
Unit 1 DTS 1600-6 Revision 2 e.
Close Instrument Air SV 562 f.
Close Service Air SV 563 g.
Close Sphere REDT Drain Line MO 506 MO 505 h.
Close primary & secondary feedwater & heater bypass.
Ho 8 MO 9 MO 4
~
MO 5 1.
Close Fee'dwater to control rod" MO 24
'~
drives J.
Close heating steam inlet-MO 522 k.
Close reactor cleanup demin bypass MO 523 1.
Close.
MO 1211-1 2.
Close.
MO 1212-1 1.
Leave OPEN service water inlet MO 520 Place cautioncard on control switch Leave OPEN service water discharge.
RACK. 0.0.5 OPEN MO 521 RACK 0.0.S OPEN MO 510 Close cleanup demin resin TRANSFER VFC 508 m.
VFC 509 n.
Close secondary steam generator blowdown FCV-515 5516 o.
Close clean demin water sphere booster FCV 504 i
\\_
1542 024 21
Unit I DTS 1600-6 Revision 2 p.
Close cont. denin makeup water inlet C
MO-527 Close PRIMARY steam line drain (50-31) q.
FCV 365 r.
Close heating steam condensate return FCV 534 Close cleanup demin waste line MO 103 s.
MO 104 PANEL C-5 t.
Close North & South Primary Steans isolation
- MO 169 MO 170 NOTE:
~~~" Bypass emergency coadensor operating switches u.
Close North & South primary steam drains M0 167 & MO 168 v.
Leave EMERGENCY condenive North & South C
INLET OPEN M0 100 MO 108 w.
Close electromatic relief RV 351
.I RV 352 x.
Close Emergency consensor North & South outlet M0 101 MO 109 y.
Open vent on EMERGENCY condenser "A"
SO 100 "B"
S0 101 PANEL C-4 Close Sphere vent INLET and EXHAUST (A0501-504) 1542 025 24
~ Unit 1 DTS 1600-6 Revision 2 PANEL C-3 aa.
Close secondary steam 150 MO 160 MO 162 H0 164 H0 166 bb.
OPEN secondary Feedstater valves MO 112 MO 114 NO 140 MO 150 l
cc.
Turn secondary feedwater control to 100% flow A0 6 A0 7 A0 8 A0 9 PANEL C-2 dd.
Close all primary, bypass, secondary steam stops PANEL B-2 ee.
Close steam seal regulator supply M0 49 ff.
Close steam to air ejectors H0 1 gg.
Close post incident valves H0 511 H0 512 b
1542 026 25
~
Unit 1 DTS 1600-6 Revision 2 C
PANEL B-2 gg. MO 513 MO 514 MO 515 MO 516 hh.
Close and take 0.0.S Post incident Supply MO 545 MO 546 II.
Close Core spray valves CS 11 CS 12 CS 13 CS 14 CS 17 CS 31 CS 32
-j CS 33 MO 517 MO 518 JJ. Open core spray valve CS 16 OPEN & drain line bet. ween CS 31 & 517
& 518 47 Take the sphere siren switch out of service.
1542 027 t
26
Unit I
~
DTS 1600-6 Revision 2
, ((
CHECKLIST 4 POST TEST OPERATIONS 1.
Return all valve line ups to proper operating conditions.
2.
Place siren switch back into proper operating condition.
((
-1 1542 028 g
9 G
27
Unit 1 DTS 1600-6 Revision 2 CHECKLIST 5
(
Instrument Group:
Pretest Checklist The instrument group will be responsible for the following work prior to the test:
COMPLETED 1.
Install Instruments and connect as required.
2.
Close isolation valves on the following instruments.
Sphere Scram switches PSH 5, 6, 7 s 8.
a.
b.
Low Range Pressure Transmitter PIT 15 c.
Sphere Pressure Switches for the evacu-ation stren. PSH 11 & 12.
3 Valve out level transmitter on emergency condenser.
4.
Calibrate all required ILRT test instru-mentation.
1542 029 b
28
Unit 1 OTS 1600-6 Revision 2 CHECKLIST 6 POST TEST
(
Instrument HechanicS COMPLETED 1.
Remove ILRT Instrumentation 2.
Restore valves and switches changed in step 2 checklist 5 to their normal operating position.
C 1542 030 0
L L
29
Unit I DTS 1600-6 Revision 2
(_C, TECHNICAL STAFF PRETEST CHECKLIST 7 1.
Arrange for the calibration of the instrumentation to be used.
WRf Verified 2.
Make a survey of the primary containment for the purpose of establishing any tendencies for regional variations in temperature. This survey will be used in determining where to place the temperature sensing devices.
Verified NOTE Where testing experience with a given containment structure has pr eviously estabilshed appropriate locations for temperature sensors, temperature surveys may be eliminated.
3 At the same time as the temperature survey, conduct a survey for the purpose of determining the placement of the humidity indicators so that a repres ntative sampling of the primary containment air can be made.
/
I Verified NOTE As in the case of the temperature survey,
- b. m this humidity survey may be eliminated for a containment structure which has known and characteristic humidity patterns.
4.
Verify the placement of all temperature and humidity sensing devices from the surveys in steps 2 and 3 above.
Verified 5
Obtain the instrument accuracles for all instruments and read-out devices to be used in the ILRT.
Perform an error analysis to verify that the accuracy of the collected data is consistent with the magnitude of the specified leakage rate. This analysis must be done prior to the placement of any instrumentation in the primary containment for the test.
(See Appendix A, attached, for a sample calculation.)
INTERPRETATION Specifically, the combined instrum&nt hs.
repeatability error should be less than4} }}} 25 percent of Lp, the maximum allowable leak rate. Verified 30
vast I DTS 1600-6 Revision 2 , (( 6.- Arrange for the availability of the air compre.ssors for use in pressurizing the containment. s WR# Verified 7 Examine LLRT results for all tests and verify that all Tech-nical Specification ilmits have been met prior to the start of the ILRT. Also, obtain the total calculated leakage from the primary containment penetrations both prior to and after repairs (in the case of double gasketed seals, before and after opening the seal). This information will be required when the results of the ILRT are analyzed. Verified 8. Arrange with the Instrument Mechanics for placement of the calibrated instrumentation in the primary containment and its connection to read-out devices outside the primary containment. Verify the location and operabillty status of the instrumentation. WR# Verified ~ 9 Verify the availability of " instrumentation for the recording of ambient atmospheric changes. These devices need only be of such accuracy that they will indicate gross barometric (C_ variations for correlation to test results. Verified ) 10. Determine the volume of the primary containment associated with each temperature and humidity sensing device. This 7 information will be used during the test for volume weighting the data. Verified 11. Insure that the air compressors, piping, manifolds and connections to the penetrations are installed by the Main-tenance Department as required. Also verify proper operation of the compressors. WR# Verified 12. Conduct a. thorough examination of the sphere to remove any pressurized vessels, gas pressure cylinders, sealed or semi-sealed containers, and anything which, in the judgement of the Test Director, could be damaged by the pressure test atmosphere or have a direct bearing on the resul ts of the leakage rate measurement. h Verified '7 1542 032 31
Unit 1 DTS 1600-6 Revision 2 ~ ( 13 Verify valve line-up of Operating Department Checklist prior to starting the test. Verified 14. Vertfy that the air locks are closed. Vertfled 15. Direct the Operations Department in the pressurizing of the primary containment. Verified 16. Inittate a dated log of events and pertinent observations. This log must be maintained for the duration of the ILRT. Verified 17 Prepare graph paper for the plotting of the appropriate data. Verified 18. Ensure that the follcwing penetrations are closed and have ( been local leak rate tested. 16' Bolted Hatch Emergency Condenser Manway Verified ~~ ~~~ 19 Store the 3" threaded pipe cap removed from the temporary te st penetration (H-1501 located in the equipment air lock. The original cap must be used in sealing the penetration after the test. Verified .) 1542 033 32
Unit 1 DTS 1600-6 Revision 2 TECH STAFF ~ POST TEST CHECKLIST S 1. Have the original 3" cap replaced on penetration H-1 50 (temporary electrical penetration) and perform a final local leak rate test. Verified 2. Verify that all temporary instrumentation is removed. Verified 3 Perform a final local leak rate test on the line ~ used for pressurization and depressurization. Verified 4. Notify W.E. upon completion of ILRT. Verified 1542 034 W 9 e W 33
Unit 1 DTS 1600-6 Revision 2 (( RADIATION PROTECTION PRETEST \\- CHECKLIST 9 1. Remove portable radiation detectors from sphere just prior to test. Verified 2. Remove end window chamber from continuous air monitor. Verified NOTE Several sphere air samples may be required during the tes t. RADIATION PROTECTION POST TEST CHECKLIST 10 1. Take a sphere air sample and monitor the sphere blowdown as required. 2. Replace the sphere portable, radiation detectors. Verified kC. Replace the end window chamber on sphere CAM. Verified h. D. L. l \\.. 34
v m 4 h em 4 5
- Gq 1
D / TR 4 1 DTR 3 1 E T D T l Ai T t D U R 2 1 DTR 1 1 D TR 0 1 ) F D T .!l ~ ( R S l 9 G t S i D T D T E A R lE1 E H R l Sd 0 8 T R D r S T L H l R LAS l KD E l' C. AS ET T 7 liRAE CLD R D l U T T R I. AR E 6 P M D E T T R 5 D TR 4 DTR 3 D TR 2 D TR 1 D T R e R U O H 0gB o C r
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n e 0 - A 3 DTR 9 2 D TR 8 2 E T Tl D A T i t D U R 7 2 D TR 6 2 DTR i! I r' 5 2 ) F D T ( R j ,i.tI! S 4 G 2 i t i D D T A R 2 E R G,O0 3 R 2 S D f l T S l R E A S T 2 A E 2 D R U D T T A R R E 1 P 2 M E D T TR 0 2 DTR 9 1 D TR 3 1 DTR 71 D TR 6 1 I I._, C DTR R U 0 l I t D#N 0wN l
F, '. T "..8 N I ) O0* g5EE P1 F W ( E D . o,A TN I ) O 9* P F W ( E D f ~ 3 T 9m N E T IO8F h ) T I A N P D U W ( E D T N I ) O7F P W ( E D l. i' i l' TN I ) F O 6 P t i. il' j'. N1 (, 1 I. I l
- l i
E D S G N T 3 1, h D t ) pO. A P }F 0 E R W ( E t T D S N A I O T P T A W N D E I ) D O F i 4 P W - ( f i E D i! TN I ) O F 3 P O W ( E D TN I ) O F 2 PW ( E D TN I ) O1 F P W ( E D Q W. N YA D s 4N aVo c o D
5;-
- 58
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i g - i i R O T L C E A^V E E e i iI 1I 0i R L l It I T hU A E L R R U B O RT iS A T EA T CTf A AF AT A E WP A T R M D A E D T E N V I A TT NN OE C M EY T VT l l I I E T I Al B Li r M Eu A l Ri E T i t E I B M A P E R ETU G NT AE RI R E BE 7' t Vl P AAi t E T Mn4N aUe O C e ,i' I l .li I i
c3;;._ O$ __$o& N $ ;; oa w g E T T I A N D U ) F '( S G I i i j l i. N D A E R R O S NN OE 5I S OOR E l U iB T S AA TR A E T AP A TM D AE DT T N E I B M A ~ O( i d Cu o*D ii = C e
~ c1 " - w.$?m ~ O< m53~ . k' T EN RE UM TN AI RA ET PN MO) ECF T Y( ER GA AM E T RI ER T I A N VP D U A N I TN E EM RN UI SA ST i l! 1 t 1 i l!t T EN) R RO a L PCl C s P RY p I I R( AA E tt i Yi l T RR DP R l O i 6 F t 4 ]P 1 S AM A R T O E A F R N U C. D I S SP D E ) E RN a T PI i A s L L0 p U A C I 12( L T 1 A F C O P T l l E M N I E AR) TU a NSi OS s CE p R( YP R AM I ~ R P RFT ' HOS i M a_.i._ E T RpY HoA J i CAN C4. r l
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. H-E Y L AR O Tk Nb [0 C l i Y FT A ON D OM Y E T R FA H OD T I A N D U T I M I L) y Ea CD N/ E% SI D( o F N O 'f C a, I T R L L E G ? I R A m O R a F EL e V 7 N AE O T) hI MA y i R a A D i M AK/ t S R CA% E( I O A F TL T N S A I I T D D A E e TA L U C L T A A N C lo P )y a D / ( L AT A O T H N I S AS A NM) s Rb I l A( Y R S D A H 4* ROT VTS 0NE 1 T 1 I e ( Lod,DPN, 6 E D C
Unit 1 DTS 1600-6 Revision 2 ( APPENDIX A Definition of terms: Pa Means the calculated peak containment internal pressure related to the design basis accident and specified either in the technical specification or associated bases. Lp Means the maximum allowable leakage rate at pressure Pa as specified for pre-operational tests in the technical specification or associated bases, and as specified for periodic tests in the operating license. Lp, as defined in Dresden U - 1 Tech Specs, is 0.4 weight percent of the contained air per 24 hrs at a pressure of 20 psig. ' Lto Means the maximum operational leakage rate at pressure Pa. - Ij i By definition Lto = 75% Lp, thus allowing a 25% margin of ' i ~ i e i I safety. s i i iLam i Means the total measured containment leakage rate at pressure.,
- Pa obtained f rom tes ting the containment with components and systems in as close to as practical the state which would exist under design basis accident conditions.
4 e e 1542 043 t 9 (* 47
Unit I DTS 1600-6 ~ ~ ' Revision 2 APPENDIX B A. INSTRUME T ACCURACY ERROR ANALYSIS Per ANSI N45.4-1972, the computation of the leak rate is given by the equation: L(%)=( H )(100)( 1 - 2)_2400 (j, M 2) P W1 H T2 1 where L = primary containment leak rate (%/ day) H = time interval between data sets #1 r, #2 (hours) W1= weight of the contained dry air mass at test data set #1 (1bs) 9 t of. contained dry. air mass.. _.. _ _ _. _ _ V " WJ i h 2 at test data set #2 (1bs) T1= volume weighted primary containment temperature at test data set #1 (OR) t-T2= volume weighted primary containment t'emperature at test data set #2 - (OR) 'a Pl= dry air absolute pressure at test data set #1 (psla) ^ ~ "'- P2= dry dir abso1~ut'e 1 ressure at' test data 5 set #2 (psia) ~ The standard variation on L due to the uncertainties in the measured variables is given by: 6(P ))2 + ( 6(P2))2 + (3l 6(TI))2 + (3 6 (T2))2] 6(L) = {( 1 2 g 32 substituting H = 24 hours 3L, T1 P2 1_ = Z 391 T2 P1 P1 3L T1 ,,L 3P2 T2 P1 P1 3L P2 1 3T1 T2 P1 T2 EL T1 P2, L T 4P1 T2 3T2 2 assuming P1 =P2 = P and T1 = T2 = T where [ = average absolute dry air pressure spsia) T = average volume weighted primary containment absolute teeperature ( R) \\ = i 43 i
Unit 1 DYS 1600-6 Revision 2 Therefore, 6(L) = 100 [ 2(6 @ ') + 2(6 @ )) t P T 1. Calculation of 6(T) NVOL T = I (VF )(Tave,y) j J=1 where VF) = the volume weighting factors NVOL = the number of containment subvolumes Tave,y = the average absolute temperature in the Jg subvolume 3 I'I Tave,J = ;J NJ i where TI,J = the absolute temperature ... of the Ith RTD in the jg... subvolume ~ NJ = number of RTD's in the J g subvolume Now, 6 (T) is calculated f rom NVOL 6(T) = I 6 (L.ve,j ) BT J=1 where BT__ = VFJ 3Tav e,). 3(Tave,J) = RTD accuracy 3 Therefore, NVOL 6 (Y) = I (VFJ) (RTD accuracy) (Nj)2 j.i 2. Calculation of 6(P) 6(@ = [ 6(PT)2 + 6(Py)2]i where PT = total absolute primary containment pressure PV = partial pressure of water vapor in the primary containment ( a u 44 1542 045
Unit 1 DTS 1600-6 Revision 2 substituting 6(PT) = PPG accuracym (# of PPG's) 2 6(Py) = (VFJ)( **"* Y) N 1=1 where PPG = precision pressure gage NJ = number of dewcells 'in the Jg subvolume Therefore, 6 (F) = [ ( 0 *CfPG;) + (E (VFJ)(dewcell a uracy))2]3 f 3 Determine the appropriate variable quantities and perform the above analysis twice - once for the system accuracy and once for the system repeatability. b 1542 046 ( () 45 i
Unit i i DTS 1600-6 ),, APPENDIX.C Revision 2 CALCULATIONS. PERFORMED A. Average 'Subvolume Terperature and Dewpoint. TJ=I(1 RTD's in jth_ subvolume) op Humber of RTD's in the jg subvolume D.P.J = I(all dewcell in jth subvolume) F Number of dewcells in jg subvolume where Tj = average temperature of t e jth_ subvolume D.P.j = average dewpoint of the jt_h_ subvolume h ~' (NOTE. By definition D.P.j<_ Tj) ~ ~ B. Primary Containment Temperature and Dry Air Pressure. - - - iiVOL - I f Tj = undefined, then T = I (VFj)(Tj) *F TJ = T (j + 1) for i < j<(NVOL-1) J=1 TJ = T (j - 1) for j = NVOL NVOL If D.P.j = undefined, then D.P. = I (VFJ)(D.P.j) *F D.P.j = D.P. (j + 1) for i < j< (NVOL-1) J=1 0.P.j = D.P. (j - 1) for j = NVOL D.P. (* K) = 273.16 + 0.P. (*F) - 32 X = 647.27 - D.P. (*K) 1.8 EXPON X (A + ZX + CX ) ~~ ~ ~ ~ - ~ ~ ~ ~A = 3.2437814 3 ~ ~ ~ ~ (D.P. (*K)) (1 + DX) Z = 5.86826.10-3 Pv = (218.167)(14.696) PSI C = 1.1702379.10-0 e (EXPON in 10) D = 2.1878462.10-3 P = I (All absolute pressure gauges) , gy p,; Number of absolute pressure gauges where: NVOL = number of primary containment subvolumes VFJ = volum,e weighting factor of the jt_h subvolume h T = volume weighted containment temperature D.P. = volume weighted containment dewpoint X,A,Z,C,D,EXPON = dewpoint to vapor pressure conversion constants & coefficients Pv = volume weighted containment vapor pressure P = contained dry air absolute pressure NOTE The subvolume numbering sequence is from the warmest to the cooles t subvolume. (assuming top to bottom ' due to stra tification.) 1542 047 e 46
Unit 1 DTS 1600-6 Revision 2 C. Contained Dry Air Mass 6 W = (28.97)(144)(P) (2.87 6 x 10 ) Ibs. 1545.33 (T + 459 69) r 2.876 x 106 = primary containment volume (ft ) ~ -" 3 D. Measured Leak Rates.
- ~
Lm(TOTAL) = ( ) (g g, ) %/ Day Lm(POINT) = (ti~- t g y ) (M0_0) ~ %/ Day V ;..; where, V Base = mass of contained air at t=0 (Ibs) WI = mass of contained air at t=1 hrs (1bs) tl = test duration at the i,t_h, data set (hrs) {' h 2. Statistical Leak Rate and Confidence Limits. LINEAR LEAST SQUARES FITTING OF THE IPCLRT DATA The method of "Least Squares" is a statistical procedure for finding the best fitting regression line for a set of measured data. The criterion for the best fitting line to a set of data points is that the sum of the squares of the deviations of the observed points from the line must be a minimum. When this criterion is met, a unique best fitting line is ob-tained based on all of the data points in the ILRT. The value of the leak rate based on the regression is called the statistically average leak rate. Since it is assumed that the leak rate is constant during the testing period; a plot of the measured contained dry air mass versus time would ideally yield a straight line with a negative slope (assuming a non-zero leak rate). Obviously, sampling techniques and test conditions are not perfect and consequently the measured values will deviate from the ideal straight line situation. Based on this statistical process, the calculated leak rate is obtained from the equation: V = _At + B-~ where W = contained dry air mass at time t (1bs) B = calculated contained dry air mass at time t=0 (1bs) A = calculated leak rate (1bs/hr) t = test duration (hours) LL 1542 048 47
Unit I DTS 1600-6 Revision 2 B Contained Dry op,
- 4 Air Mass (1bs)
Test Duration (hrs) The values of the constants A and B such that the regression line is best fitting to the ILRT ' data are A = { NE(tI) (Wi}} - [(ItI) (IWI)] ~ [ NI(ti)' - (Eti)'] I~ I B= N In order to reduce the round-off error in the above calculations, the equations are rearranged such that: ^ " II (t i-D (Wi-II)] [I(ti-t)dj (E (t i) 2) (EWI)] - [(It i) (E (t 1) (Wi)~)'] ' B= [ NZ (ti) 2] - (Eti)2 } By definition, leakage out of the primary containment is considered positive leakage; therefore, the statistically average leak rate in weight percent per day is given by: Ls = (-A) (2400)/.B (weight %/ day) Statistical Uncertainties In order to calculate the 95% confidence limits of the statistically average leak rate, the standard deviation of the least squares slope and the Student's T-Distribution function are used as follows: 1 NE(Wi)2_(gy;)2 ~^2 i ' " I(N-2) NE (t i ) Z- (It i ) 4 UCL = ls+ 6 1542 049 e-48 L, i
Unit I DTS 1600-6 e - 2 a Revision 2 where TE = 1.645 + 1.5068 + 1.7136 (N-2) (N-2)" g N = number of data sets tl = test duration at the Ith data set ~ Wi = contained dry air mass at the I,y1 data set a = standard deviation of least squares slope TE = value of the single-sided T-Distribution function with 2 degrees of freedom Ls = calculated leak rate in %/ day UCL = 95% upper confidence limit in / day ( 3.. 1542 0150 9 8 4 l' 5,_ L u.u.. e e O 49(final)
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