ML19343B060
| ML19343B060 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 08/19/1975 |
| From: | Vandenburgh D YANKEE ATOMIC ELECTRIC CO. |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| WYR-75-88, NUDOCS 8011250244 | |
| Download: ML19343B060 (13) | |
Text
-
a er Proposed Changa No. 126
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Islephone 617 366-90!I
._a TWX 750 390-0739 YANKEE ATOMIC ELECTRIC COMPANY
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20 Turnpike Road Westborough, Massochusetts 01581 Yamm, es August 19, 1975' T
'l United States Nuclear Regulatory Commission Washingten, D. C.
20555 Attention: Office of Nuclear Reactor Regulation
Reference:
1.
License No. DPR-3 (Docket No. 50-29) 2.
Proposed Change No. 112, Revised Technical Specifications and Final Safety Analysis Report submitted, January 3, 1974.
3.
Yankee Rowe Final Hazards Summary Report.
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Dear Sir:
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Pursuant to Section 50.59 of the Commission's Regulations, Yankee Atomic Electric Company hereby requests to make the following change:
PRCPOSED CHANGE: We propose to modify the Primary vent Stack Monitor described in Secticn 11.4.1.3 of Reference 2 to include an isokinetic Qb
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sampling and monitoring arrangenent for radioactive particulates, gases, and iodine.
REASON FCR CHANGE: The system presently installed and described in Section 11.4.1.3 of Reference 2 provides monitoring capability for radio-active gases only and cannot be conveniently calih ated.
The proposed i ystem is a complete state-of-the-art airborne radioactivity sampling and monitoring system.
It provides for continuous off-line monitoring of radioactive particulates, gases, and iodine with the advantage of convenient calibratien.
DESCRIPTIC" CF CHA'!GE:
1.
Remove the present stack monitoring equipment and seal all existing.
plant vent stack penatrations that this removal entails.
2.
Install (through four stack penetrations at the 1133 foot, 6 inch elevation level of the plant vent stack) the monitoring system
isokinetic sampling nozzles.
3.
Locate the particolate, gas, and iodine detectors and associated electronics in an enclosure on the Primary Auxiliary Building roof near the plant vent stack.
4.
Locate renote chart recorders and alarm modules in the Main Control Room.
Details in Enclosure 1.
8011250 2 W
United States Nu ar Regulatory Commission August 19, 1975 Attn: Office of Nuclear Reactor Regulation Page Two 5.
Replace Page 215:2 of the Final Hazards Summary Report with Enclosure 1.
6.
Replace Westinghouse drawing 548D638 following Page 215:1 in the Final
' Hazards Summary Report with Enclosure 2.
7.
Replace Page 215:4 of the Final Hazards Summary Report with Enclosure 3.
8.
Replace Pages 11.4-1 and 11.4-2 of the Final Safety Analysis Report with Enclosv.re 4.
9.
Replace Figure 11.4-1 of the Final Safety Analysis Report with Enclosure 5, Pages 1 and 2.
10.
Add Paragraph 5 to Page 16.5.1-3 of the Final Safety Analysis Report as in Enclosure 5.
11.
Change Page numbering of the Final Hazarus Surmary Report as follows:
1.
Replace Page 215:2 as per Enclosure 1 2.
Add Page 215:2a as,ar Enclosure 1 3.
Replace Page 215:4 as per Enclosure 3 4.
Add Page 215:4a as per Enclosure 3 12.
Change Page numbering of Final Safety Analysis Report as follows:
1.
Replace Pages 11.4-1 and 11.4-2 as per Enclosure 4 2.
Add Page ll.4-2a as per Enclosure 4 SAFETY CONSIDERATIONS:
The proposed changa does not present significant.
hazard considerations not described in the reference license as amended.
This proposed change has been reviewed by the nuclear Safety Audit and Review Committee.
SCHEDULE OF CHANGE: The changes will be effected prior to our October 1975 refueling period and the system will be placed in service upon approval of this Proposed Change.
Very truly yours, YANKEE ATC*1IC ELECTRIC COMPANY
@.t.V D. E. Vandenburgh Vice President COf0IONWEALTH OF MASSACHUSETTS)
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COUNTY OF WORCESTER
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Then personally appeared before me, D. E. Vandenburgh, who being duly sworn, did state that he is a Vice President of Yankee At.omic Electric Company, that h2 is duly authorized to file the foregoing request in the name and on the behalf of Yankee Atomic Electric Company, and that the statements therein are true to the best of his knowledge and belief.
, om b Armand R. Soucy Notary Public My Commission Expires September 9, 1977 L
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" #' U4 ENCLOSURE 1 215:2
. f. WW Alarms, tith. visible and' audible, are als6 ~provided i6ich operate when:
The air flow rate becomes either too high or too low.
The filter breaks or fails to advance in the normal manner.
The valve closure circuit is energized.
The alarms remain tripped until the alarm reset buttoit on the panel front is actuated; the visual unit remains lit until normal conditions are restored.
Main Plant Stack Radiation Monitor - Four isokinetic probes are bstalled 1-in the main plant vent stack.
Two probes are calibrated for a stack flow rate experienced during power operation, and two for a purge operation flow rate.
The probes are connected through stainless piping to two sample effluent lines lo.cated within the Monitoring Equipment Building on the roof of the Primary Auxiliary Building.
One sample effluent line comprises a fixed particulate filter which may be removed periodically for laboratory analysis, and an iodine charcoal cartridge which is continuously monitored.
The other sample effluent line-contains a moving particulate filter and gas detector.
The iodine detector is a NaI crystal and a count rai:e meter with a
- single channel analyzer set to discriminate against all but the I-131 gamm'a.
The particulate detector, which views a moving filter tape is a beta scintillation detector with a count rate meter.
The noble gas.T.onitoring channel uses a beta scintillation detector identical to the one in the particulate channel, and also has a count rate meter.
4 The three count rate meters are identical except for the single channel analyzer included in the iodine channel.
Each has a five decade range fron
- 10 to 106 counts per minute, and is equipped with a two level alarm system.
Both indication and alarm appear locally at the detector cabinet, and in the Main-Control Room chart recorders and alarms are provided for all three channels.
Each channel alarms at a preset high 1cvel, and in the event of loss of signal, loss of high voltage, detector failure, or any other failure resulting in.a preset low reading.
Each of the.two pumping systems is provided with a high and low flow alarm in the Main Control Room.
The sensitivity of the partictilate channel is such that a concentration of 5 x 10-12 pCi/cc of gross beta activity wi11' produce a counting rate of.
approximately 90 C/M' above a background counging rate of 30 C/M.
On the noble gas channel, a concentration of 3 x 10-UCi/cc of Xc-133 will produce a counting rate of 88 C/M above a background of 30 C/M.
The iodine channel can detect a count buildup of ~approximately -17 C/M per hour of co11cetion above a 30 C/M background.
Three motor driven upscale check sources which may be actuated locally at the detectors a-d remotely in the Main Control Room will check the operation of each channel.
5
1 C
C ENCLOSURE 1 215:2a l
Page 2 CohponentCoolingWaterDetector-Thecomponentcoolingwaterdetector is a singic Geiger-Muller tube, together with an impedance matching circuit, housed in a weatherproof probe.
The detector assembled in its housing is inserted in a thimbic welded into the main return pipe upstream from the
' component cooling pump suction block valves.
The component cooling water detector ontinuously measures the activity of the component cooling water. A high cctivit; indication closes a solenoid operated trip valve in the vent line of the component cooling water surge tank.
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.3 1
ENCLOSURE 3 215:4 Page 1 Air Ejector Effluent Detector - The air ejector effluent leak detector is a scintillator together with impedance matching circuit and is housed in a
. weatherproof probe.
The detector and its housing is mounted'in the air ejector effluent line to the primary auxiliary building exhaust fan suction.
i I
The leak detector is a medium sensitivity beta-gamma detector, with a sensitivity range of.01 to 10 mr per hr, with a. gamma energy response of 0.25,
mer to 2.5, and a beta energy response above 0.154 mev.
The computer-indicator, mounted on the radiation monitoring equipment panel, includes a pulse amplifier and a logarithmic count-rate integrator and meter amplifier.
i 1
The indicator includes a backgrcund flasher, alarm lamp, and indicating meter.
The computer-indicator has a range of 1 to 1,000 counts per second on a 3 decade log scale.
Provision is also made to operate a recorder and an alarm circuit with visible and audible indications. The alarm remains tripped until I
the alarm reset button on the panel front is actuated; the visual unit rema2ns l
lit until normal conditions are restored.
i Radiation Monitoring Equipment Console - A radiation monitoring equipment console is located in the control room.
A console consists of two cabinets providing mounting space for eight channels (computer-indicators), a relay unit and a calibratica unit, a power distribution panel, a plate voltage and '. lament power supplies.
Line regulators are also mounted in the cabinet.
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The radiation monitoring equipment exclusive of the detectors is. mounted in equipment racks. All equipment housed in the two cabincts, except for the power supplies, is mounted in pull-out drawers for casy access.
A large removable door allows entry to the rear of each rack.
A single equipment console in the Main Control Room houses the particulate, nob'le gas, and radiciodine monitors for the plant vent stack, including chart recording and alarms.
Site and Fortable Radiation Detection Equipment General - The site and portable radiation detection equipment includes the instrumentation required for providing the radiation Icvel information necessary for the protection of plant personnel and for determining any increase in normal background activity of the plant site.
The da. pails of the use of all the equipment listed are described in Section 507, RADIOLOGICAL HEALTH AND SAFETY, Dosimeters and Film Badges - Personnel dosimetry and film badges /TLD's are provided.to measure integrated exposure on all personnel working in contami-nated areas.
The dosimeters are the direct reading type.
Hand and Foot Monitor - A hand and foot monitor is located adjacent to the entrance of the lockerroom.
This unit monitors both hands and feet simultaneously.
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- l' ENCLOSURE 3 215:4a l
Page'2
- l Portable Radiation Detectors - A total of ten portable radiation l
detectors are provided for radiation survey work.
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y ENCLOSURE 4 Page 1 11.4 Process and Effluent Radiological Monitoring Systems Radiation detectors monitor and indicate radiation levels and concentrations throughout various plant areas and systems.
ThTs monitoring system includes both detectors for monitoring liquid and gaseous media at various points throughout the plant as well as detectors for monitoring direct radiation icvels in various plant areas.
The purposes of this monitoring system are as follows:
1.
to provide warning of any radiation exposure hazard within the
- plant, 2.
to provide warning of releases of radioactivity from the plant in excess of the per=itted values, 3.
to provide early warning of a plant malfunction which might result in a radiation exposure hazard or plant damage.
A diagram of the radiation tonitoring system is shown on Figure 11.4-1.
The location and nonitoring characteristics of each of the detectors within the system are presented below.
11.4.1 Operational Radiation Monitoring 11.4.1.1 Radiation Monitoring System Console A radiation monitoring systeu console is located in the control room. A console consists of two cabinets providing counting space for ten channels (corputer-indicators), a relay unit and a calibration unit, a power distribution panel, plate voltage and filament power supplies.
Line regulators are also mounted in the cabinet.
The radiation tonitoring equipment exclusive of the detectors is mounted in equip:ent racks.
All equipment housed in the two cabinets, except for the power supplies, is counted in pull-out drawers for easy access. A large renovable door allows entry to the re'ar cf each rack.
A single equiptent console in the Main Control Room houses the particulate, noble gas, and radiciodine conitor for the plant vent stack, including chart recording and alarms.
11.4.1.2 Vapor Container Air Particulate Detector The vapor container air particle detector continuously samples and checks the air for presence of particulate matter in the vapor container.
The air is drawn through a section of moving filter. paper upon which the particulate tatter is coilected. Directly behind the filter paper, at the point where collection occurs, is a scintillation counter.
The output signal pulses from the scintillation counter are amplified by a preamplifier and fed to the computer indicator located in the radiation monitoring console.
The vacuum pu'=p that pulls the air through the flow meter and filter paper is located in the vapor container.
The filter paper transport mechanism, scintillation detector and preamplifier are located in a weatherproof enclosure nounted on the outside of the vapor container near the personnel
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ESCLOSURE 4 Page 2 I
i The ccmputer-indicator mounted in the radiation monitoring system console. includes I
a discriminator, a pulse shaper amplifier, and a logarithmic countrate integrator and meter amplifier. Mounted on the front panel is a background flasher, alarm lamp, alarm reset pushbutton, indicating meter and a recessed sub panel containing all the operating controls. The indicating meter has a range of 10 to 10,000 cps on a three decade log scale.
The air particle detector has a sensitivity of 10-9 to 10-6 microcuries per cubic centimeter of beta radioactive particulate, detectable in less than 15 minutes with fixed filter, or 30 minutes with filter moving at 1 inch per hour.
A fast advance filter paper speed of 6 inches per mirate is provided which makes it ponsible to clear the contaminated tape from the detecting area within a very
[
short time.
The filter paper supply is sufficiant for 30 days at the normal i
speed of 1 inch per hour.
Remote provision is made to allow the operator to j
select the desired speed of a tape drive mechanism.
In order to check the cali-bration of the system a remote controlled source, consisting of a small piece of Radium DEF foi? 10 mils thick with a 22 year half life, can be positioned in front of the detector. Alarms both visibic nnd audible, are also provided which operate when:
1.
The air flow rate becomes either t6o high or too low.
2.
A specified concentration is reached.
The alarms remain tripped until the alarm reset butten on the panel front is actuated; the visual unit remains lit until normal conditions are restored.
l 11.4.1.3 Primary Vent Stack Radioactivity Detector Four isokinetic probes are installed in the main plant vent ntack. Two probes are calibrated for a stack flew rate experienced during power operation, and two for a purge operation flou rate. The probes are connected through stain-less piping to two sample effluent lines located within the Monitoring Equipment Eailding on the roof of the Primary Auxiliary Building.
One sample effluent line comprises a fixed particulate filtcr whjch may be removed periodically for lab analysis, and an iodine charcoal cartridge which is continuously monitored. The other sample effluent line'contains a'doving i
particulate filter and gas detector.
i, The iodine detector is a NaI crystal and a count rate meter with a singic channel analyzer set to discriminate against all but the 1-131 gamma.
The particulate detector, which views a moving filter tape, is a beta 4
scintillation de;;cctor with a' count rate meter.
1 Tne noble gas monitoring channel uses a beta scintillation detector identical to the one in the particulate channel, and also has a count rate meter.
4 11.4-2 i
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.Page 3 J
i The three count rate meters are identical exuapt for the singic channel j
analyzer included in the iodine channel.
Each has a five decade tange from 10 to 106 counts per minute, and is equipped with a two'~1evel alarm system.
Both indication and alarm appear locally at the detector cabinet, and in the Main Control Room, chart recorders and alarms are provided for all three channels.
Each. channel alarms at a preset high level, and in the event of loss of signal, loss of high voltage, detector failure, or any j
other failure resulting in a preset low reading.
Each of the two pumping systems is provided with a high and low flow alarm in the Main Control Room.
The sensitivity of the particulate channel is such that a concentration' of I
5 x 10-12 pCi/cc of gross beta activity'will prcMuce a counting rate of approximately 90 C/M above a background counting rate of 30 C/M.
On the noble gas channel, a concentration of 3 x 10-6 pLi/cc of Xe-133 vill _ produce l
a counting rate of 88 C/M above a background of 30 C/M.
The iodine channel can see a count buildup of approximately 17 C/M per hour of collection i
I above a 30 C/M background.
i Three motor driven upscale check sources which may be actuated locally at l
the detectors and remotely in the Main Control Room will check the operation of each chanrel.
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11.4-2a-
DHTECTOR 10 CATION AND IIUMBER CONTROL ROOM CONSOLE RECORDER
. VC AIR PARTICI1---------------- E4-ND-1 l l PRE-/JIP !
AMPLIFIER I INDICATOR l n
i MECRANICAL FAILUP3 d
[A1AE4 l SWITCH l
l COMPONE!~r COOLING--------------lRM-ND-3 l
l/diPLFIER l
[ INDICATOR l
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- 1 S.G. 'BIDWDOWN---------------[R4-ND-b l
lAtiPLIFIERI l INDICATOR l l ALAE 4 l Fil
- 2 S.G. BIDWIO;Cl---------------IRM-ND-g l l_id4PLIFIER l l INDICATOR l
!ALAP24 l l6I
- 3 S.G. BLOWD010!---------------l E4-ND-6 ]
[ AMPLIFIER l l INDICATOR l l ALAE 4 l l
l7I h74 S.G. BIDWD0;C?------ -- ------- E4-ND-7 l l/d4PLIFIER l
[ INDICATOR l I
lALAEI l AIR EJECTOR EFFLUE;I----------- E4-ND-8 l lld4PLFIER INDICATR l ALAE 1 l LOOP SFA L-- ---- --------- -- -----l E4-UD-9 l
l PRE-AMP!
l AMPLFIER I l INDICATOR I l ALAE 4 l
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. ELEED LINE------l E4-ND-10 I I/J4PLFIERI t.
e-l INDICATOR]
--l AIAE1 l PODR GEGINAL SPARE---- IC i
Enclosurc 5, page 1,
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P002DEiggt Yar.kee 2:: lear Figure Pcwe: S ation OPERATI0IIAL RADIATION MOUITORIUG SYSTDI 11.h-1 Sheet 2
. Enclosure 5, page 2
o Table 16.5.1-3 MINIMUM FREQUENCTES FOR CllECKS, CALIBRATIONS AND TESTING OF
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M !"CEI.I.A Ni:Olff; IN:;rRlDil:NTATION AND CONTROI.S Clo unie,I, _l!c :c r i p t i ott
- urvelIlance Function.
Frequency, Surveillance !!ethod Proce:., 1:adiation Monttorn a.
Ch.uutel Functional Test M
a.
Internal test signals usal to verify instrument operation.
v,9 b.
Channel Calibration Tent M
b.
Exposure to known external radiation source.
Accident-Emergency High a.
Channel Functional Test M
a.
Internal test signal used Level Radiation Monitor to verify instrument operation.
b.
Channel Calibration Check A
b.
Exposure to known external k
radiation source.
(Oh DaT9 C2h iccident-Emergency Channel Check M
Operational Check.
[5[I Environmental Monitors OT wn)
Verify proper operation of(7-~.,. ;.J
- ontrol Rod Drive System Channel Functional Test R
[nterlocks all control rod Rod Blocki~
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interlocks using simulatalC s
signals.where necessary.
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Mnt Stack Monitors Es
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Channel Functional Test M
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Exposure to calibration ryc check sources.
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Channel Calibration Test R
b.
Exposure to known externa 1 G radiation source.
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- ach Refueling ENCLOSURE 6
O O
NRC DISTRIBUTION FOR PART 50 DOCKET MATERIAL (TEMPORARY FORM)
CONTROL NO:
8968 FILE:
FROM: Yankee Atomic Electric DATE OF DOC D ATE R ECD LTR TWX RPT OTHER Co.
k'estborough, Mass. 01581 8-19-75 8-23-75 XX D.E. Vandourgh TO:.
ORIG CC OTHER SENT NRC PDR XX NRC 3 signed 37 SENT LOCAL PDR W -
4 C L. ASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:
XXX 40 50-29 DESCRIPTION: Ltr notari::ed 8-19-75 requesting ENCLOSURES:
Revised Tech Spec Change Pages fer Proposed Change No.126 to Tech Specs for Proposed Tech Spec Change No. 126....
in re to Primary Vent Stack Monitor & trans tLe following:
(40 cys enc 1 rec'd) 4 p,;,-,-
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SCHWENCER (L) ZIEMANN (L)
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W/ Copies W/ Copies W/ Copics W/ Copies CLARK (L)
STOLZ (L)
DICKER (E)
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W/ Copies W/ Copics W/ Copies W/ Copies PAR R (L)
VASSALLO (L)
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SPIES W/ Copies W/ Copies W/ Copies W/ Copies KNIEL (L) 4URPLE (L)
YOUNGBLOOD (E)
LPM W/ Copies W/ opies W/ Copics W/ Gopies INTERNAL DISTRIBUTION FfYh TECH REVIEW DENTON LIC ASST A/T IN D.
PGC ROOM P-506A RC PDR SCHROEDER GRIMES R. DIGGS (L)
BRAITMAN MACCARY GAMMILL H. GE ARIN (L)
SALTZMAN 40SSICK/STAF F KNIGHT KASTNER E. GOULBOURNE (L)
MELTZ CASE PAWLICKI BALLARD P. KREUTZER (E)
GIAMBUSSO SHAO SPANGLER J. LEE (L)
PLANS BOYD STELLO M. RU3HEROOK(L)
MCDONALD MOORE (L)
HOUSTON ENVIRO S. REED (E)
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HARTFIELD (2)
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