ML20101N218
| ML20101N218 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 04/03/1996 |
| From: | Querio R COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9604080294 | |
| Download: ML20101N218 (2) | |
Text
Commonwealth lilison Conyuny tasalle Generating 5tation 2 Nil North list Road Marseilles, IL 613 41-9~'57 Tcl HI 5-35Nc61 i
April 3,1996 United States Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555
Subject:
LaSalle County Nuclear Power Station Units 1 and 2 Submittal of Additional Information discussed during the March 28,1996 Conference Call Regarding Modifying the Main Steamline Tunnel Automatic Isolations NRC Docket Nos. 50-373 and 50-374
References:
1.
G. Benes letter to U. S. NRC, dated I
January 18,1996, LaSalle Submittal Regarding Main Steamline Tunnel Leak Detection isolations 2.
R. Querio letter to U. S. NRC, dated March 22,1996, Comed Submittal of Additional l
Information Reference (a) provided LaSalle Station's proposal for revising the Technical Specification requirements for the Main Steamline Tunnel Automatic Isolations. Reference (b) provided additional Comed information. The i
purpose of this letter is to provide additional information that was discussed during the March 28,1996 conference call between NRR and Comed.
Response 11 to Reference (b) stated "that a persistent 100 gpm steam leak in the main steam tunnel would result in offsite radiological doses which are well within applicable regulatory limits." The acceptance criterion used to make this statement were the "short term", (instantaneous) limits of 10 CFR 20. As stated in the Comed Offsite Dose Calculation Manual (ODCM), Equation A-28, this acceptance is based on the adult thyroid inhalation dose (100 mrem / year TEDE). Equivalently, the offsite concentration of I-131 was noted to be well below the concentration limit t
given in 10 CFR 20, Appendix B, Table 1, Column 2. Long term, large leaks in the Main Steam Tunnel (i.e.,100 gpm) may cause Off-Site Dose releases i
0 that could exceed 10 CFR 50 Appendix 1, Concluding Statement, C.1 thyroid 9604080294 960403 PDR ADOCK 05000373 P
PDR A l'nwoni Company
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doses (i.e., thru the cow milk pathway during the outdoor pasture season) if undetected. However, all gaseous releases are monitored by the station vent stack Wide Range Gas Monitor (WRGM) and are kept within all applicable regulatory limits. The release of lodine is monitored by the station vent stack WRGM using a continuous charcoal sample cartridge unit, which is changed and counted weekly in accordance with the Comed ODCM, j
LaSalle Annex, Chapter 12, Table 12.4.1-1.
1 The original Significant Hazards Consideration, that was included in the Reference (a) submittal, remains valid.
i If there are any further questions or comments concerning this letter, please i
j refer them to me at (815) 357-6761, extension 3600.
l l
Respectfully, l
/
L ad R. E. Querio Site Vice President l
LaSalle County Station Enclosure cc:
H. J. Miller, NRC Region ill Administrator l
D. M. Skay, Project Manager - NRR - LaSalle P. G.- Brochman, NRC Senior Resident inspector - LaSalle F. Niziotek, Office of Nuclear Facility Safety - IDNS Central file Il l
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