ML20058J063
| ML20058J063 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 12/06/1993 |
| From: | Saccomando D COMMONWEALTH EDISON CO. |
| To: | Murley T NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM), Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 9312130364 | |
| Download: ML20058J063 (3) | |
Text
Commonwesith Edison O'
1400 Opus Place Downers Grove, libnois 60515 December 6,1993 Dr. Thomas E. Murley, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C. 20555 l
Attn:
Document Control Desk
Subject:
Supplemental Information Pertaining to j
Emergency Technical Specification Amendment l
Facility Operation Licenses NPF-72 and NPF-77 Technical Specification Section 4.4.5.0 b!RC Docket Nos. 50-456 and 50-457
References:
December 1,1993, Teleconference between Commonwealth Edison Company and the Nuclear Regulatory Commission
?
Regarding Supplemental Information Pertaining to Emergency Technical Specification Amendment D. Saccomando letter to Dr. Murley dated November 12,1993, transmitting Request for Emergency Technical Specification Amendment
Dear Dr. Murley:
The following documents the conversation that took place between Commonwealth Edison Company (CECO) and the Nuclear Regulatory Commission (NRC) during the reference teleconference. Specifically addressed were Attachment C section 1 of the referenced letter, which dealt with compensatory actions.
The NRC requested that CECO provide justification for the selection of the revised setpoints for the Steam Jet Air Ejectors and the Main Steam Line radiation monitors. CECO response described :
The new alert setpoint for the Main Steam Line monitors was lowered as much as possible, to.2 mR/hr, which is just above background.
(Background radiation levels for that area are typically.1 mR/hr.)
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' Dr. Murley December 6,1993 l
The Steam Jet Air Ejector alarm set point was derived based upon data collected during the Unit 1 C Steam Generator Leak. Braidwood Chemistry trended the radiation monitor readings and the associated chemistry samples. The Chemistry Department used the radiation monitor-readings which were observed at 300 gallons / day (gpd) subtracted background radiation readings and extrapolated radiation readings to correlate to 150 gpd. This extrapolated reading is now used as the revised alarm setpoint.
3 The revised alert setpoint on the Steam Jet Air Ejector monitors I
corresponds to approximately three times the background reading.
1 The NRC asked CECO to clarify the revision to the abnormal operating procedure l
which provided guidance to Operations and Chemistry personnel regarding monitoring to detect increases in leakage rate when known primary to secondary leakage exists. The temporary procedure change to BWOA SEC-8 " Steam Generator Tube Leak Unit 1" contains the following guidance:
When a primary to secondary leak is detected:
Chemistry will perform BwCP 310-4 "SG-Primary to Secondary Tube l
Leak Rate," once per hour if the leak rate is changing. When the j
leak rate is determined to be constant, then chemistry samples will l
be taken once per 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, then once per day.
i Operations will display group 12 (secondary monitors) on the RM 11 (radiation monitors) and trend once per hour. If the radiation level increases, then Operations will have Chemistry perform a leak rate determination.
.}
Consideration will also be given to moving portable N-16 monitor to j
the affected Steam Generator and checking that monitor once per l
hour. This monitor will be used for trending purposes; therefore, if 1
the reading increases, then a leak rate determination should be made
-l' via chemistry samples.
The station has aise issued a corresponding temporary procedure change for l
Braidwood Unit o 1
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" Ifr. Murley
-3 December 6,1993 If you have any questions concerning this information please contact me at (708)663-6484.
. Sincerely,
. hna. /
n, Jg Deiiise M. Sa pando Nuclear Licensing Administrator j
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- R. R.-Assa, Braidwood Project Manager - NRR S. G. Dupont, Senior Resident Inspector - Braidwood B. Clayton, Branch Chief-Region III Office of Nuclear Facility Safety - IDNS i
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