ML20093A399
| ML20093A399 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 07/06/1984 |
| From: | Kemper J PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Schwencer A Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8407100440 | |
| Download: ML20093A399 (6) | |
Text
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PHILADELPHIA ELECTRIC COMPANY 2301 MARKET STREET P.O. BOX 8699 PHILADELPHIA PA.19101 (215)841-4502 VIC E#R ESID E NT July 6, 1984
..............u.a==
Mr. A. Schwencer, Chief Licensing Branch No. 2 Division of Idcensing U. S. Nuclear Pegulatory Ca mission Washington, D.C. 20555
Subject:
Lirerick Generating Station, Units 1 and 2 Post Accident Sarpling System (PASS)
Chemical Engineering Branch
Reference:
BKR Owners Group (BWROG) and NRC Meeting dated May 2, 1984.
File:
GOVT 1-1 (hTC)
Dear Mr. Schwencer:
At: discussed and agreed to at the reference BWIOG and NPC meeting, attached, are IES draft FSAR page changes to Section 11.5.5 describing the nodified dissolved gas nuasurement capability of the post accident canpling systen.
The infouration contained on the draft FSAR page changes will be incorporated into the FSAR, exactly as it appears on the attachments, in the revision scheduled for July, 1984 Sincerely, L
h y e g..
PJS/gra/06288408 cc: See Attached Service List g
8407100440 840706 a1 PDR ADOCK 05000352 (ACV A
PDR Y/
I I
cc: Judge Lawrence Brenner (w/o enclosure)
Judge Richard F. Cole (w/o enclosure)
Troy B. Conner, Jr., Esq.
(w/o enclosure)
Ann P. 'iodgdon, Esq.
(w/o enclosure) t Mr. Frank R.' Panano (w/o enclosure)
Mr. Robert L. Anthony.
(w/o enclosure)
-Charles W. Elliot, Esq.
(w/o enclosure)
. Zori G. Ferkin, Esq..
(w/o enclosure)
Mr. 'Ihanas Gerusky (w/o enclosure)
Director, Penna. Daergency (w/o enclosure)
Management Agency Angus R."IcVe, Esq.
(w/o enclosure)
David Wersan, Esq.
-(w/o enclosure)
Pdert J. Sugarman, Esq.
(w/o enclosure)
Spence U. Perry, Esq.
(w/o enclosure)
Jay M. Gutierrez, Esq.
(w/o enclosure)
Atanic Safety '& Licensing (w/o enclosure)
Appeal Board Atanic Safety & Licensing (w/o enclosure)
Board-Panel Docket & Service Section (w/o enclosure)
Martha W. Bush, Esq.
(w/o enclosure)
Mr. James Wiggins (w/o enclosure)
'Mr. Timothy R.' S. Campbell (w/o enclosure)
Ms. Phyllis Zitzer (w/o enclosure)
Judge Peter A.' Morris (w/o enclosure)
I i
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LGS FSAR 11.5.5 POST-ACCIDENT SAMPLING SYSTEMS l
l The post-accident sampling systems iPASS) are designed to obtain representative liquid and gas grab samples from the primary coolant system and from within the primary and secondary containments for radiological and chemical analysis under accident conditions.
The grab samples are subsequently transported to the radwaste enclosure chemistry laboratory and counting facility for chemical and radiosotopic analyses, or shipped offsite for analysis.
t The PASS is designed to satisfy the requirements of'NUREG-0737 i
item II.B.3.
The system design minimizes operating complexities and "in-liae" instrumentation, is modular for maintenance and contamination control purposes, and is compact in size to reduce the amount of shieldir.g required.
The system can be used to provide samples.under all plant. conditions, ranging from normal shutdown and power operation-to post-accident conditions.
The PASS piping and instrument diagram is.shown in Figure 11.5-2.
The equipment includes isolation ~andEcontrol valves, piping racks, shielded sample" stations (gas-and liquid), liquid'
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group classification,'and corresponding codes and standards that i
chillers, and control. panels.
The seismic category, quality apply to the design of the PASS'are discussed in Section 3.2.
A separate PASS is provided for each unit with common demineralized water, nitrogen _and tracer gas support systems.
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11.5.5.1 System Descrip': ion
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11.5.5.1.1 Sample Points l
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a.
Wetwell and Drywell Atmospheres l
Sample lines are installed to obtain atmosphere samples from two separate areas in both the drywell and wetwell.
i Drywell samples are taken at El 291 and 242 ft.
Wetwell samples are taken at El 222 ft on opposite sides of the containment.
The sample lines tap into the containment atmospheric contrcl system (CACS) sample lines outside l
the primary containment and outboard of the second containment isolation valve.
Containment gas samples l
will be representative of conditions throughout the l
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primary containment because the contai'iment is not compartmentalized and the atmosphere ia fully mixed.
11.5-25 Rev. 17, 02/83
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and a measured volume of diluent (generally 10 milliliters) through the valve and into the sample bottle.
This provides an initial dilution of up to 100:1.
The sample bottle is contained in a shielded cask and remotely positioned on the sample needles through an opening in the bottom of the sample enclosure.
Non-Diluted Liquid and Dissolved Gas Samples
-- 27 I hJ S c.v 4 h C ternatively, the sample.can be diverted throug 70 13111ter holdup cylind er to obtain'depre rized sampl of primary coolant gas and liquid ses.
A coolant le is circulate d through a h up cylin6er, the cylinder then isolat ed and the ntents circulated thro a gas.lo ap conta ing a measured amount.of. inert kr on.
The ga are vented to an and a'.fractionJof the evacuatedjgas collect ch a'm cm..
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[ ti5n of krypton in the ~
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cbromAtEgr5phy..T sample is used to cal ate the action of the
, dissolv'ed gases rec ered.-
The kr ontalso serves as a stripping agent low gas. concentrat s.
Ten
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milliliter al ots of degassed, liquid c then be taken A
for offsite or'onsite depending on activit evel) analyses ich require a re latively large undi ed sampl
.This sample is obt ained remotely using th l
lar volume cask and cask positioner through needles underside of the sample station enclosure.
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l 11.5.5.1.4.3 Sample Station Ventilation 1^
l The sample station enclosure will be vented to a Zone V room in the secondary containment.
Ventilation is facilitated by differential pressure between the control structure and reactor enclosure.
The ventilation rate required for heat removal and proper sweep velocity during operation is about 40 scfm.
A pressure gauge is attached to the sample station enclosure to L
l monitor the pressure differential between the enclosure and the l
general sampling area in the control structure.
The pressure j
differential will assure the cperator that airborne activity in the samble enclosure will be swept into secondary containment.
l l
l Rev. 17, 02/83 11.5-30 l
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11.5.5.4.4
;22 CI. :::t ;!:;I Jill b; _C f 10 2:::::: '?f! ;;; : f 0;y;-.
co ntrations in containment atmosphere and dissolved gas l
71NS*d b a.
Dissolv ydrogen concentrations -
n accuracy of +10 percent can expected over the nge of concentrations from 50 to 200
/Kg.
Below cc/Kg, the accuracy will be +0.05 cc/K.
Gas omatography has been succc;; fully d: ;nstra -
fer the deter =inction cf hydrogen in THI-2
-ac nt gas samples.
-b.
Dissolved ygen concentrations - -
olved oxygen will b easured indirectly using the re ual hydrogen me of analysis.
Using this method, diss ed oxygen ncentration is. verified to be less than 0.1 p by measurement of positive hydrogen residuals:of great su -
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t 11.5.5.4.5 Determi, nation of Extent of Core Damage f
A gencric procedure to assess the extent of core damage based on radionuclide concentrations and other parameters has been prepared by the BWR Owners Group and transmitted to the NRC by letter from Mr. T. J. Dente to D. Eisenhut dated June 17, 1983.
A Philadelphia Electric corporate proceduce based on this niethodology has been prepared and tcansmitted-to-the-NRC.
r 11.5.5.4.6 Storage and Disposal of Sample Short-term sample storage areas will be provided in the chemistry laboratory and counting room facilities.
An area for long-term storage of the samples will be designated at a later date.
Low level wastes generated by the chemistry procedures will be flushed to radwaste.
Ultimate procedures for disposal of the r
samples will be determined later; however, after a sufficiently long decay period, the activity levels will be significantly I
reduced.
This will ease exposure problems during disposal.
f 11.5.5.4.7 System Testing and Operator Training
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11.5-39 Rev. 32, 05/84
DRAFT ms A
The sanple station can provide depressurized samples of the primary coolant gas and liquid phases.
A coolant sample is circulated through
.a holdup cylinder and the dissolved gases are vented into a partially evacuated gas collection chanber. Total dissolved gas concentration is determined by measuring the resulting collection chamber pressure rise.
A fraction of gas may be removed for analysis by gas chranatography and/or gama ray spectroscopy. Ten milliliter aliquots of degassed liquid may be taken for offsite (or onsite depending en activity ' level) analyses which require a relatively large undiluttd carple.
'Ihis sanple is obtained remotely using the large volume cask ard cask positioner.through a needle en the underside of the sample station eaclosure.
INSEIU B Gas Analysis
' Total dissolved gas concentrations will be determined by measuring gas collection chamber pressure rise, as discussed above. The accuracy of this measurment has been determined by testing and analycic to be at least:
+. 50% between 25 cc/kg and 50 cc/kg
} 30% betwen 50 cc/kg and 400 cc/kg A gas chranatograph will be used to treasure hydrogen and oxygen concentrations ' in containment atmosphere and dissolved gas sanples.
The accuracy of the contalment gas analysis will be at least:
15% between.1 and 30 volume percent of the constituent The accuracy of the dissolved oxygen analysis will be at least:
160% between 4 ppn and 8 ppn 3 30% betwen 8 ppn and 20 ppn
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