ML19329E400
| ML19329E400 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 07/24/1978 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Howell S CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| References | |
| NUDOCS 8006120721 | |
| Download: ML19329E400 (1) | |
Text
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CIN:o.L Fii.ES JUL 2 41978 l
Docket No. 50-329 Docket No. 50-330 Consur ars Power Company ATIN:
Mr. Stephen H. Howell Vice President 1945 West Parnall Road Jackson, MI 49201 Centlemen:
The enclosed IE Circular No. 78-15, is forwarded to you for information., If there are any questicas related to your under-standing of the suggested actions, please contact this office.
Sincerely.
. Tames G. Keppler Director
Enclosures:
1.
IE Circular No. 78-15 2.
List of IE Circulars Issued in 1978 cc w/encls:
gneralPiles Director, NRR/DPM Director, NRR/ DOR PDE Local PDR NSIC TIC Ronald Callen, Michigan Public Service Consnission Dr. Wayne E. North Myron M. Cherry, Chicago p
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7-24-78 7-24-78 DATE >
NRC Form 318A (R2EE) (5-76) NRCM 02040
- U. S. GOVERNMENT PRINTING OFFICE: 1978-253-81 8006120 72/
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i U. S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT i
July 24, 1978
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IE Circular No. 78-15 TILTING DISK CHECK VALVES yAIL TO CLOSE WITH GRAVITY IN VERTICAL POSITION The Anchor / Darling Valve Company reported to the NRC on May 23, 1978 a condition at the San Onofre Nuclear Plant where an 8" - 1500# tilting disk check valve failed to close with gravity because it was installed in a vertical rather than a horizontal pipeline. The valve disc was counter weighted to close with the forcs of gravity when installed in i
a horizontal pipe. The manufacturer did not eetermine the reverse flow necessan to close the improperly installed valve. The check valve 1:
located in the Low Pressure Safety Injection System as the first valva inside the containment and may not have closed as required to maintain the containment integrity.
Anchor / Darling has notified all purchasers of such valves and iM' md to them possible implications of vertical installations.
It should be noted that similar problems may arise with tilting disk checx valves from other manufacturers.
Tilting disk checkvalves can be designed for either horizontal or vertical piping but not for both. Improperly installed tilting disk check valves will not function properly.
All holders of operating licenses or construction permits should be aware of the potential for malfunction of safety-related systems caused by improperly positioned tilting disk check valves. Consideration should be given to the importance of verifying that all such valves 2
in critical systems are installed only in the orientation specified by the manufactursr.
No written response to this circular is required.
If you require additional information regarding this matter, contact the Director of the Regional office.
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.f IE Circular No. 78-15 July 24, 1978 LISTING OF IE CIRCULARS ISSUED IN 1978 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 7'-02 Proper Lubricating 011 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 Quantities of Reactor OLs, cps, Lov Specific Activity Fuel Cycle, Radioactive Material Priority I Material for Transport and Waste Disposal Licenses 76-04 Installation Error That 5/15/78 All Holders of Could Prevent Closing of Reactor OLs or Fire Doors cps 7*-35 Inadvertent !:afety Injection 5/23/78 All Holders of During Cooldown Reactor OLs or cps 78-06 Potential Cor: mon Mode 5/23/78 All Holdere 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-Pateraon 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 cps 78-09 Arcing of General Electric 6/5/78 All Holders of Company Size 2 Contactors cps Enclosure Page 1 of 2
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s IE Circular No. 78-15 July 24, 1978 LISTING OF IE CIRCULARS ISSUED IN 1978 Circular Subject Date of Issued to No.
Issue 70-10 Control of Sealed 6/14/78 All Medical Sources Used in Licensees in Radiation Therapy Categories G and G1 73-11 Racirculation M-G 6/15/78 All Holders of Set Overspeed Stops BWR OLs or cps 78-12 HPCI Turbine Control 6/30/78 All Holders of Valve Lift Rod Bending BWR OLs or cps for plants with HPCI Terry Turbine 78-13 Inoperability of Multiple 7/10/78 All Holders of Service Water Pumps Reactor OLs and cps except for plants located in: AL, AK, i
CA, FL, GA, LA MS, SC 78-14 HPCI Turbine Reversing 7/12/78 All Holders of BWR Chanber Hold Down Bolting OLs or cps for plants with a HPCI Terry Turbine excepting Duane Arnold and Monticello Enclosure Page 2 of 2 l
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