ML19345A799
| ML19345A799 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 11/20/1980 |
| From: | Delgeorge L COMMONWEALTH EDISON CO. |
| To: | Youngblood B Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8011250212 | |
| Download: ML19345A799 (3) | |
Text
O one Fast National P! art Chscago. I bnois Commonwealth Edison Audress Reply to-Post Off<ce Box 767 Chicago. Ilhnois 60690 November 20, 1980 Mr. B.
J.
Youngblood, Chief Licensing Branch No. 1 Division of Licensing U.S. Nuclear Regulatory Commission dashington, DC 20555 Suoject:
LaSalle County Station Units 1 and 2 Supplemental Response to NRC Question Concerning Conformance to Regulatory Guide 1.56 NRC Docket Nos. 50-373/374 Reference (a):
L.
O. DelGeorge letter to B.
J.
Youngolood dated Octooer 27, 1980.
Dear Mr. Youngblood:
This transmittal provides ir formation *o supplemant the response provideo in Reference (a) concerning tne LaSalle County conformance to Regulatory Guide 1.56.
The specific information provided in the enclosure responds to questions posed oy Mr. Bournia o f your sta f f on November 10, 1980, concerning previously transmitted responses to Q200.2, Q200.4 and Q200.6.
If there are any further questions in this regard, please direct them to this office.
Formal documentation of this information will De made in an amendment to the LaSalle County FSAR.
Very truly yours, f
L. O. DelGeorfe Nuclear Licensing Administrator Enclosure
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cc:
RIII Resident Inspector - LaSalle 9, t 8011250S/A 8319A
d.
The utilization of the criteria in Section 4.c.
is sufficient for maintaining resin capacity, thus tne verification of resin capacity by actual sampling is unnecessary.
Such sampling would involve radiation exposure to the person doing the sampling, and in keeping with our ALARA policy, such exposure cannot be justified.
Question Section 10.4.6 of the FSAR descriDes only qualitatively 200.o the measurement of conductivity of the condensate demineralizer influent and effluent.
Describe your water chemistry control program to assure maintaining condensate conductivity within the limits of Table 2 of Regulatory Guide 1.56, revision 1.
Include conductivity meter alarm set points and the corrective actions to be taken if the limits of TaDie 2 are exceeded.
Resoonse The condensate demineralizer system has in line conductivity meters whicn continuously monitor the inlet and outlet conductivities.
The conductivity meter readings are reviewed on a regular basis.
Calibration checks on the conductivity meters will be performed on a regular basis in accordance with Station Procedures.
Conductivity meters alarm set points will be set in accordance with the guidelines provided in Table 2 of Regulatory Guide 1.36 (Revision 1).
Exceeding the demineralizer effluent set points will normally require resin cleaning and/or resin regeneration.
If accompanied by condensate demineralizer inlet water quality also exceeding the limit, which might indicate condenser tube leaks, actions would be taken in accordance with the LOA 1(2)PLO5J 5-3 procedure.
The frequency of resin cleaning and/or regenerations would be increased to maintain water quality in accordance with Table 2, Regulatory Guide 1.56 (Revision 1), and to maintain reactor water quality within Technical Specifications limits.
If regenerations and resin cleaning could not be performed at a rate necessary to maintain the water quality within limits, corrective actions would be initiated in accordance with Technical Specifications.
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d
ENCLOSURE Question Describe the sequential resin regeneration frequency or 200.2 replacement frequency that will oe estaDlished in order to maintain adequate capacity margin in the condensate treatment system (Regulatory Position C.2 of Regulatory Guide 1.56, revision 1).
Include the basis for the resin regeneration or replacement frequency.
Response
The resin regeneration frequency and the basis for resin regeneration are addressed in FSAR 10.4.6.2 and FSAR Appendix B, Amendment 30, 1978.
Based on Dresden Nuclear Power Station deep bed condensate polisher nistory, it is expected that regenerations would occur at least annually, and more frequently if deemed necessary, in order to maintain water quality within the guidelines of Regulatory Guide 1.56, (Revision 1), Table 2.
Question Describe the method that (a) the conductivity meter 200.4 readings for tne condensate polishing system will oe calibrated; (b) the flow rates through the demineralizers of the reactor water cleaning system will be measured; (c) the quantity of the principal ions likely to cause demineralizer breakthrough will be calculated; and (d) the accuracy of the calibration of resin capacity will be checked (Regulatory Position C.4 of Regulatory Guide 1.56, revision 1).
Resoonse a.
The conductivity meter readings for the condensate polishing system will be compared to flow cell conductivity readings which have Deen measured against a vendor supplied standardized conductivity cell.
The expected error in the plant conductivity instrumentation is estimated to be : 0.02,gmhos/cm based on the vendor's instrument specifications.
This is 2% of full scale of the condensate polisher conductivity recorders, b.
Flows through the reactor water cleanup cemineralizer are measured with orifice plates and flow transmitters.
Individual demineralizer flow and system flow is measured.
c.
Resiti breakthrough is first noted by the presence of silica in the ef fluent.
The practice of regenerating resins based on silica breakthrougn or the exceeding o f the setpoints, set in accordance with Table 2 o f Regulatory Guide 1.56 (Revision 1),
has shown to be an effective program for maintaining water quality and combating cooling water inleakage.
LaSalle Station intends to follow this program in the operation of the condensate polisher system.
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