ML19305A190
| ML19305A190 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 01/16/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 7901220227 | |
| Download: ML19305A190 (7) | |
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9, t NUCLE AR REGULATOnY COMMISslON
,b ItEGION V LUI TE 2 02, W ALPdU T C R E E K PL A Z A
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WALfeUT C RE EK C AltFon ril A 9459f, JAN 14 Fi9 Docket tio. 50-312 Sacramento Municipal Utility District P. O. Box 15830 Sacramento, California 95813 Attention: 11r. John J.
tattinoe Assistant General fianager Gentl enen:
The enclosed IE Circular flo. 79-02, is forwarded to you for information.
If there are any ouestions related to your understanding of the suggested actiens, please contact this office.
Sincerely, fil d?$~
R. H. Engel ken Director
Enclosures:
1.
IE Circular t!o. 79-02 2.
List of IE Circulars Issued in the last 12 months cc w/ encl:
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IE Circular No. 79-02 Januarv 16, 1979 Daqe 2 of 2 of the inverter static switches is that durina one of the transfers of site loads, the instantaneous inductive load caused these trip set points to be exceeded. The licensee has subsequently adjusted the transfer sensinq circuitry to higher overcurrent and lower undervoltage trip settings to assure that the inverter will naintain load over the widest possible range of voltage and current.
(Note that in this case, once the SCI inverter transfers to the alternate source, it will not automatically transfer back to normal source.)
All holders of operating licenses should be aware of the potential problems of the types noted above.
It is recommended that the following items be considered in your review of this natter:
1.
Determine whether or not time delay circuitry is used i your inverter units.
If so, have they been adjusted to the appropriate set point as required by equipment and the integrated systen designs?
2.
Determine if the AC input voltage and transformer tap settings are optinized to prevent exceeding the inverter component name-nlate naximur rated DC input voltage in the event of a high AC input voltage transient.
3.
If an alternate 120 volt source is used in your design, determine if the protection transfer circuitry of the inverter has been optinized within design limits to ensure naximun nossible avail-ability of the inverter systen during transient loadine conditions.
An operatina history of inexplicable transfers may be indicative of the above.
4 Determine if the administrative controls enoloyed by your facility ensures operability of safety systems after its subcomponents (e.g., time delay relays, switches, etc.) have been subjected to maintenance or testing.
This Circular is also being forwarded to all holders of construction permits for their information with regard to preoperational and startup testing.
No written response to this Circular is required.
If you require additional information regarding this natter, contact the Director of the appropriate lRC Regional Office.
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IE Circular "o.
79-02 January 16, 1979 LISTING OF IE CIRCULARS ISSUED IN LAST TWELVE M0"THS Circular Subject Date Issued To No.
of Issue 78-01 Loss of Well Logging 4/5/78 All Holders of Source Well Logging Source Licenses 78-02 Proper Lubricating Oil 4/20/78 All Holders of for Terry Turbines Reactor OLs or cps 78-03 Packaging Greater Than 5/12/78 All Holders of Type A Cuantities of Reactor OLs, cps, Low Specific Activity Fuel Cycle, Radioactive Material Priority I Material for Transnort and Waste Disposal Licenses 78-04 Installation Error That 5/15/78 All Holders of Could Prevent Closing of ReactorCLs or Fire Doors cps 78-05 Inadvertent Safety Injection 5/23/78 All Holders of During Cooldown Reactor OLs or cps 78-06 Potential Cormon Mode 5/23/78 All Holders of Flooding of ECCS Equipment Reactor OLs or Rooms at BWR Facilities cps 78-07 Damaged Components of a 5/31/78 All Holders of Bergen-Paterson Series Reactor OLs or 25000 Hydraulic Test cps Stand 78-08 Environmental Qualification 5/31/78 All Holders of of Safety Related Equipment Reactor OLs or at Nuclear Power Plants CDs 73-09 Arcing of General Electric 6/5/78 All Holders of Company Size 2 Contactors cps Enclosure Page 1 of 3
IE Circular No. 79-02
.lanuary 16, 1979 LISTI"1 0F IE CIRCULARS ISSUE 9 I!!
LAST TWELVE 'OMTHS Circular Subject Date of Issued to flo.
Issue 70-10 Control of Sealed 6/14/78 All "edical Sources Used in Licensees in Radiation Therapy Cateaories G and G1 73-11 Recirculation '!-G 6/15/78 All Holders of Set Overspeed Stops BWR OLs er cps 78-12 HPCI Turbine Control 6/30/78 All Holders of Yalve Lift Rod Bending BUR OLs or cps for plants with HPCI Terry Turbine 73-13 Inoperability of Multiole 7/10/73 All Holders of Service Water Pumps Reactor OLs and Ces except for olants located in: AL, AK, CA, CL, GA, LA, MS, SC 73-14 HDCI Turbine 7eversino 7/12/73 All Holders of BWR Cham.ber Hold Dcun Boltinq OLs or CDs for plants with a HPCI Terry Turbine exceoting Duane Arnold and !1onticello 78-15 Checkvalves Fail to 7/20/78 All Holders of Close In Vertical Reactor OLs or CDs Position 78-16 Limitorque Valve 7/26/78 All Holders of Actuators Reactor OLs or CDs 78-17 Inadequate Guard Training /
10/13/78 All Holders of Qualification and Falsified and applicants Training Records for Reactor OLs.
Enclosure Dage 2 of 3
IE Circular No. 79-02 January 16, 1979 LISTING OF IE CIRCULARS ISSUED IN LAST TWELVE MONTHS Circular Subject Date of Issued To No.
Issue 78-18 UL Fire Test 11/6/78 All Holders of Reactor OLs or cps 78-19 Manual Override (Bypass) 12/28/78 All Holders of of Safety Actuation Signals cps 79-01 Administration of 1/12/79 All Medical Unauthorized Byproduct Licensees except Material to Humans Teletherapy Medical Licensees and each Radiopharmaceutical Suppliers Enclosure Page 3 of 3