ML20032B977
| ML20032B977 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 11/04/1981 |
| From: | Sargent C COMMONWEALTH EDISON CO. |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8111060573 | |
| Download: ML20032B977 (12) | |
Text
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"N) one Rrst N1tional P!aza, Chicago, Illinois
[C Commonwealth Edison
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(, C Address Reply to: Post Office Box 767 Chicago, Illinois 60690 1l 5
November 4, 1981 i
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A. Schwencer, Chief g/
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Division of Licensing I
5 1937 U.S. Nuclear Regulatory Commission
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Washington, D.C.
20555
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Subject:
L-calle County Station Units-1 and 2.
Proposed FSAR Change - Chlorine N
Detection NRC Dockets Nos. 50-373/374
Dear Mr. Schwencer:
The purpose of this letter is to transmit a proposed change to the LaSalle County Station FSAR.
The proposed change was discussed in a telephone conversation with Mr. A. Bournia on October 26, 1981.
The change includes a clarification of the detector calibration technique and a revision to the minimum detectable concentration.
This revision was necessary due to the difficulty in obtaining calibration gas below 5 ppm concentration.
Also enclosed is a copy of the vendor recommended calibra-tion procedure as requested by Mr.
A. Bournia on October 26, 1981.
The proposed changes will be included in the next Amendment to the FSAR.
If there are any questions in this regard, please contact this office.
Very truly yours, C. E. Sa rgent Nuclear Licensing Administrator cc:
NRC Resident Inspector - LSCS I*
A 3I 2812N l
8111060573 811104 i
PDR ADOCK 05000373 A
ATTACHMENT Chlorine Detection - Proposed FSAR changes.
Add:
Paragraph 6.4.5, 9.4.1.1.4 and 9.4.1.2.4 - Testing and Inspection (FSAR) (pg's 6.4-7, 9.4-6a and 9.4-12).
i (1)
The calibration 'of the chlorine detectors will be performed on a normal bases -in accordance with the manuf acturers recom-mended procedures.
No other codes or standards shall apply.
The calibration frequency is defined in the Technical Specification.
Change:
Paragi
'h 9.4.1.1.3h (page 9.4-6) and 9.4.1.2.3h (page 9.4-11,
'FSAR):
5 ppm vice 3 ppm.
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o LSCS-FSAR AMENDMENT 24 SEPTFMBFR 1977
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contamination level, during and after a LOCA.
It is possible that due to outside wind direction after a LOCA, one of the air intakes may not have.any contaminants, while the other intake may have contaminants.
The former may be utilized for makeup air in the control room.
This provides additional se-curity towards maintaining the habitability of the control room.
6.4.5 Testirg and Inspection The control room HVAC system and its components are thoroughly tested in a program consisting of the following:
f actory and component qualification tests,
a.
b.
onsite preoperational testing, and onsite subsequent periodic testing.
c.
Written test procedures establish minimum acceptable values Test results are recorded as a matter of per-for all tests.
formance record, thus enabling early detection of faulty performance.
All equipment is factory inspected and tested in accordance with the applicable equipment specifications, codes, and
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quality assurance requirements.
System ductwork and erection
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of equipment is inspected during various ccnstruction ' stages for quality assurance.
Construction tests are performed on all mechanical components and the system is balanced for the
- Controls, design airflows and system operating pressures.
and safety devices on each system are cold checked, in terlocks,and tested to ensure the proper sequence of operation.
- adjusted,
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)6.4.6 Instrumentation Requirements
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All the instruments and controls for the control room HVAC, f
system are electric or electronic.
Each redundant control room HVAC system has a Jo-4 a.
cal control panel and each is indcpendent ly controlled.
Important cperating functions are j
controlled and monitored from the main control rceom.
b.
Instrumertation is provided to mo cor important variables associated with normal i eration.
Instruments to alarm abncrmal con 62tions are provided in the control room.
A radiation detection system is provided to moni-c.
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. tor the radiation levels at the system outside air
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' intakes and inside-the control rcom.
A high rar diation signal is alarmed on the main control boar,d.
6.4-7
u ANENDSENT}5pyff;Md
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s s ps JULY 1981
- directs the supply air delivered to the conditioned
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spaces through a normally bypassed charcoal absorber for smoke and odor removal.
A manual override is provided for this function as well as the ability t'6 introduce 100% outside air to purge the control room
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as may be necessary.
Four radiation monitors are provided for each outside d.
air intake of the control room HVAC system to detect l
I high radiation approaching the outside air intakes.
The four These monitors alarm in the control room.
monitors are divided into two channels.
The high radiation actuation signal causes automatic closure of the normal outside air supply to the system and diverts the outside air through the emergency makeup air filter train before delivering it to the control room.
The emergency makeup air filter train and control room shielding are designed to Ibnit the occupational e.
dose below levels of 5 rem as required by criterion 19 of 10 CFR 50 Appendix A.
The introduction of a minimum quantity of outside air f.
to maintain the control room and other areas served by the control room HVAC system at a positive pressure with respect to surroundings, at all the plant operating conditions except when the system is in recirculation mode, precludes infiltration of unfiltered air into the control room.
The physical location of the two redundant outside g.
air intakes provides the option of using either intake opening, which, due to separation has lower contamination levels during and after a LOCA.
Two chlorine detettors are provided at each control h.
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room HVAC outside air intake to detect a chlorine UV On d~
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concentration of Q and above by volume.
detection of high chlorine concentration at the outside air intake louvers, the outside air supply to the control room is automatically shut off and the control room HVAC system is operated on recirculation mode, through the charcoal absorber.
Two ammonia detectors are provided in each redundant i.
outside air duct to annunciate ammonia concentration of 20 ppm and above on the main control panel and automatically close the outside air dampers so that mode through the system opetates in 100% recirculation the charcoal absorber.
9.4-6
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LSCS-FSAR''" [-
MiE%~p;h AMENDMENT 48 FEBRUARY 1980 j.
For the closing of the outside air dampers during the abnormal conditions of chlorine, ammonia and high radiation detection, the single failure criterion is met with a combina-tion of automatic and manual features.
9.4.1.1.4 Testing and Inspection All equipment is factory inspected and tested in accordance with the applicable equipment specifications, quality assurance requirements, and applicable codes.
System ductwork and erection of equipment are inspected during various construction Construction tests are performed stages for quality assurance.
on all mechanical components and the system is balanced for the
- Controls, design airflows and system operating pressures.
interlocks, and safety devices on each system are cold checked, adjusted, and tested to ensure the proper sequence of operation.
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AMENDMENT 39 LSCS-FSAR
' OCTOBER 1978
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A failure analysis is presented in Table 9.4-4.
b.
A local equipment fire in the auxiliary electric equipment rooms does not cause the abandonment of the I
aantetary electric equipment rooms and does not prevent a remote shutdown of the reactors, because early detection is provided, fire fighting apparatus is available, and air filtration and purging capabilities are provided.
In the event of smoke in the outside air or products l
c.
of combustion in the auxiliary electric equipment rooms, the smoke ionization detection system automatically directs the supply air delivered to the conditioned spaces through a normally bypassed charcoal absorber for smoke and odor removal.
A manual override is pro-vided for the function as well as the ability to introduce 100% outside air to purge the auxiliary electric equipment rooms as may be necessary.
d.
A radiation monitoring system is provided to detect high radiation in outside air intakes.
These l
monitors alarm in the auxiliary electric equipment The high radiation at the intake air louver room.
will automatically ~close the normal outside air supply to the system and divert the outside air through the emergency makeup air filter train before delivering it to the auxiliary electric equipment rooms.
The emergency makeup air filter train and auxiliary e.
electric equipment shielding are designed to limit the occupational dose below levels of 5 rem as required by Criteria 19 of 10 CFR Appendix A.
f.
The introduction of a minimum quantity of outside air to maintain the auxiliary electric equipment rooms at a positive pressure with respect to surroundings, at all the plant operating conditions except when the system is in recirculation mode, precludes
. _ _l __.
- _ infiltration of. unfiltered -air =into :the_au_xilia ry_ _n _
2-electric ~ equipment-room's.~
The physical separation of the locations of the two g.
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- -- redundant outside air-intakes provides the~optibH~of
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using whichever intake. opening has lower contamination levels during and af ter a LOCA.
~~% h-k{N' Chlorine detectors are provided at each: auxiliary -
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electric equipment: room-H"AC-outside air intake to
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detect the chlorine concentration of Q and above 1
by; volume.
Onl detection of high chlorine 9.4-11
b SC 2
OCTOBER 1978 concentration at the outside air intake louvers,
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the outside air supply to the auxiliary electric room is automatically shut off and the auxiliary electric equipment room HVAC system is operated on recirculation mode, through the charcoal absorber.
i.
Ammonia detectors are provided in each outside air in-take to detect ammonia concentration of 10 ppm and above.
On detection of high ammonia concentration at the outside air intake, the outside air supply to the auxiliary electric equipment room is auto-matically shut off and the auxiliary electr:c equipment room HVAC is operated on recirculation mode through the charcoal absorber.
9.4.1.2.4 Testing and Inspection All-equipment is factory inspected and tested in accordance with the applicable equipment specifications, quality assurance requirements and codes.
System ductwork and erection of equipment are inspected during Pre-various construction stages for quality assurance.
operational tests are performed on all mechanic'al components and the system is balanced for the design airflows and system C,,'
operating pressures.
Con trols, inter 1 0ks, and safety devices 9
on each system are cold checked, adjusted, and tested to ensure the proper sequence of operation.
Provisions are made for routine insgnyjna testing of the equip-ment and filters as discussed inqgection 6 4 ) The maintenance 3f is performed on a basis generally in accordance with the equip-ment manufacturer's recommendations.
Operation of each redun-dant equipment-train is rotated to provide on-line checking and testing of the performance.
The emergency makeup filter trains are subjected to the factory, preoperational, and subsequent periodic tests described in y
Subsection 6.4.5.
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9.4.2 Spent Fuel Pool Area Ventilation System hef m
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~ ~,..~ w f-kV The spent fuel pool area ventilation hystem is an inseparable
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part of the reactor building ventilation system.
This system serves cubicles and various areas in the reactor building fuel storage, steam dryer, and separator
- pools.
Each Un'it: 1 and 2 possesses an independent reactor bui-lding ventilation system.
9.4.2.1 Design Bases The reactor building ventilatio.n system limits the-temperature
(-
within served areas, thereby conforming with equipment rec-ommendations.
Additionally, th'is system provides-protection from 9.4-12
13 IDEbNR4LT wALLAce c.TIERNAN COAPORAi1ON suite 210 ?001 VIDWEST ROAD OAK BROOK itLINOIS EJ521 (312, 620 8R20 EcumiNT. CM VMS HE ALTH 5HODUCTS October 8, 1981 Commonwealth Edison Company P. O.
Box 767 Chicago, Illinois 60690 Attention: Mr. James L. Clark, Jr.
Station Ntelear Engineering Department Subj ect :
Chlorine Detector Test Kit #U-26500 Gentlemen:
The subject kit was demonstrated at your LaSalle Station on October 6, 1981.
The objective was to show the practicability of our recommended method making a calibration check of our Model 50-125D chlorine detector.
Two previous visits for this purpose had failed due to test kit component malfunction.
Two things of importance should be noted in this regard:
- 1. The test kit used is a prototype and com-ponents for future standard kits have been selected to minimize such malfunctions.
- 2. Malfunctions which have occurred will be noted in future kit instructions so that they can be prevented or corrected by proper maintenance and/or periodic component replacement.
The chlorine detectors are capable of responding to 5 ppm chlorine in air within five (5) seconds after introduction af such mixture into a 1" IPS air sample line twelve (12) feet from the detector.
The tests run on October 6 utilized ten feet of 1" tubing from the chlorine source to the detector sample piping.
The rates of response for the four detectors checked were as follows:
- 1. Detector 0AE-VC090A 4.0 secs.
- 2. Detector 0AE-VC090B 5.0 secs.
- 3. Detector 0AE-VC091A 3.0 secs.
- 4. Detector 0AE-VC091B 3.4 secs.
It is notable that, during testing, the unacceptable performance of two detectors resulted in the troubleshooting of deficiencies, correction of the problems and subsequent successful testing.
The prototype test apparatus used at LaSalle Station has pre-viously been used at Grand Gulf Nuclear Station, Mississippi Power '& Light Company, Point Gibson, Mississippi and at Plant i
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RE: Commonwealth Edison Company October 8, 1981 Chicago, Illinois Page 2 Chlorine Detector Test Kit 1
1 I
Hatch Nuclear Station, Georgia Power Company,.Baxley, Georgia.
Both series of tests were successful-and Georgia Power Company i
has ordered standard kits for regular testing use at Plant Hatch.
i.
The test kit incorporates devices similar to those used several years by us for our own testing purposes.
We continue to use the techniques in routine factory testing of shock resistant chlorine detectors prior to shipment.
We have used it repeatedly during seismic qualification testing.
Demonstrations of the tests were performed in some nuclear stations with the result being several requests to assemble a' test kit and make it available to i
the industry, Simply described, the test. kit includes a supply of 1%'(10,000 ppm) a mixture of chlorine in air, syringes for measuring quantities of the chlorine and a 100 liter bag for mixing measured quantities of chlorine in dry air.
Each 10 cc of 1% chlorine will equal 1 ppm in 100 liters of air.
We appreciate that the method and some of the devices may sound and appear cumbersome or archaic.
To some extent this is true, but if you grant the premise that the absolute best test of'the detector is to introduce 5 ppm of chlorine into the control room air duct then this method has to-be second best--5 ppm chlorine
-mixture introduced to the detector only.
The best test of any alarm device is to expose it to the actlal conditions under which it'should alarm.
Not some artificial impressed electronic value--
this does not test the prime sensor and is therefore inferential.
The reason for using the awkward bag is simply that a 5' ppm mixture t-of chlorine and air is unstable and must be used as soon as pre-i pared.
It is doubtful that a detectable quantity of chlorine would be present after one hour in such a mixture.
It presumably 1
has combined with other air constituents to become bound in mole-cular form.
This phenomenon in a 1% mixture has negligible effect on concentration value.
The test mixture used at LaSalle Station is several months o13 We feel that our posi+ Lon i-this re :ommendation (a positive response testing systen) is wei' fouaded in experience.
We have manufactured equipment which metet-and vaasures chlorine since 1913.
Residual chlorine analyzers have been part of our line for forty years, and we have manufactured chlorine detectors for i
nearly. thirty years.
About ten' years ago we switched from chemi-cally sensitive tape /reficcted light principles to a simple, 1
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RE: Commonwealth Edison Company October 8, 1981 Chicago, Illinois Page 3 Chlorine Detector Test Kit reliable, wet chemistry, current sensing device which can be reset a few minutes after exposure to alarm level chlorine concentrations.
If we can be of service to you, please let us know.
Very truly yours, Wallace & Tiernan Division PENM1 ALT Corporation lu j r;
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Beals Wallace & Tiernan Division JLB:ch cc: Mr. John Damron Commonwealth Edison Company LaSalle Nuclear Station P. O. Box 220 Marseilles, Illinois 61341 Enc 1:
Test Kit U-26500 Description Test Procedure (L2473)
i INSTRUCTIONS FOR CAllBRATION CHECK OF WALLACE & TIERNAN DIV.
CHLORINE DETECTOR MODEL 50.125D & D-1 USING TEST KIT NUMBER U-26500.
MATERIAL REQUIRED:
Test Kit Clean, Dry Nitrogen or Air under.5" H O 2
Pressure (Minimum) to fill a 100 Liter Bag PROCEDURE:
1.
At a location well away from the chlorine detector, thread the lecture bottle control valve (2) onto the valve stem (0) of the lecture bottle of compressed gas (12).
Check that the control valve is closed.
Using the wrench (14) provided open the lecture bottle valve stem by turning the stem and control valve one turn counterclockwise, insert the lecture bottle into its stand (11) and using the 1/4 !.D. tubing provided, connect the outlet of the control valve to the nippie on the 1 liter gas sampling bag (10).
The nipple on this bag is also a valve and must be turned counterclockwise to be open.
Open the control valve mounted ca the lecture bottle and fill the 1 liter sampling bag.
Do not build up any pressure in this bag or it may split open.
Start filling the 100 liter sampling bag (13) with dry air or nitrogen.
If using 2.
a compressed gas supply, connect to the small hose nipple on the sample bag as was done in Step 1, but do not use the same piece of tubing.
If using a blower, to the large hose nipple.
Connect the unused nipple to a length of connect 1/4" 1.D. Tygon and immerse the other end in the 100 cc graduate (1) half filled with water.
3 Using one of the syringes (8 or 9) supplied, and the rubber pads sealed to each sampling bag, extract 13 cc of gas from the 1 liter gas sampling bag for each part per million desired in the 100 liter bag and inject this amount into the 100 liter bag while the air (or nitrogen) supply is filling this bag.
For example, if a 5 ppm of chlorine in ai r mixture is desired, extract 50 cc f rom the one liter bag (1% mixture) and inject it into the 100 liter bag.
As soon as gas starts to bubble f rom the end of the tube submerged in the graduate, 4.
stop filling the sample bag and seal off the inlet and outlet.
The sample bag will now contain 100 liters of the desired test mixture.
Use rubber stopper in the 1" tubing connection.
5 At a point well away from the sample intaks of the chlorine detector, allow a small amount of the gas mixture to escape from the inflated bag to relieve any excess pressure.
6.
Connect one end of the 1" 1.D. tubing to the sample intake of the chlorine the other end to the 1" hose nipple of the sample bag and detector.
Connect start the stop watch (5).
Observe the red alarm light on the detector and stop the watch as soon as it comes on.
CAUTIONS:Because this calibration requires precise and careful technique, only a qualified familiar with these instructions should perform this calibration.
person results hefore each series of tests the 100 li ter gas sampling bag For best soould be filled with the test mixture to be used, left inflated for a few minutes, then emptied at a point well away from the sample intake of the chlorine This stabilizes the bag and prevents a rapid loss of c51orine from the detector.
Even with this mixture due to absorption and/or adsorption by the bag material.
precaution the mixture should not be used after 10 to 15 minutes as it will lose chlorine as time passes.
The connecting passage from the sample bag to the chlorine detector must not inch pipe.
contain any restriction greater than the restriction of 20 feet of 1 Any restriction greater than this will prolong the time to alarm.
WALLACE LDERNAN L2473 SIDEBNWALT i
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m Q#1mbtEN%fANWh5WiifdWeb M&JN'r5#25M CONTENTS OF U 26500 KEY NO.
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DESCRIPTION
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l 1
1 100 mL PLASTIC GRADUATED CY L i t;D E R l
2 1
MODEL 13M LECTURE BOTTLE CONTROL VALVE j
3 10' 1"
ID TYGON TUBING 4
6' 1/4" ID TYGON TUSING 5
1 STOP WATCH - 30 SECONDS 6
2
=3 RUBBER STOPPERS CONE) WITH NIPPLE FCR 1/4" ID TUBE 7
1 REPLACEMENT NEEDLES (20 GAUGE X 1" LG) 8 1
t1 A G NUM SERIES SYRINGE C50CC) 9 1
A-2 SERIES GAS TIGHT SYRINGE (10CC) 10 1
CAS SAMPLING BAG (1 LITER)WITH 1 VALVE & SEPTUM 11 1
LECTURE BOTTLE STAND l
12 1
LECTURE BOTTLE WITH 1% CHLORINE IN AIR l
13 1
GAS SAMPLING BAGC100 LITERS)WITH 1" HOSE CONNECTION & SEPTUM 14 1
WRENCH FOR CYLINDER VALVE
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l NOTE: o8TAIN REPL ACEMENT PARTS FROM: 10E AL GAS PRODUCTS INC.
PO. BOX 709 EDISON, N.J. 08817 U26500-CHLORINE DETECTOR CALIBRATION TEST KIT WALLACE r. TIER N AN (3 PEfNWALT L2473 i AAGE 2
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