ML19312C366
| ML19312C366 | |
| Person / Time | |
|---|---|
| Site: | Oconee, Mcguire, McGuire  |
| Issue date: | 07/24/1978 |
| From: | Thompson D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Parker W DUKE POWER CO. |
| References | |
| NUDOCS 7912130896 | |
| Download: ML19312C366 (1) | |
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",7 UNITED sT ATEs p* DCoq'c, NUCLE AR REGULATORY COMMISSION J
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JUL 2 41978 InReplEEe.fer To:
I RII:JPO 50-369, 50-370 50-269, 50-270 50-287 Duke Power Company Attn:
Mr. William O. Parker, Jr.
Vice President, Steam Production P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242 Gentlemen:
The enclosed Circular 78-15, is forwarded to you for information.
If there are any questions related to your understanding of the suggested actions, please contact this office.
Sincerely, O
W "f udley mpson Deputy irector
Enclosures:
1.
IE Circular No. 78-15 2.
List of IE Circulars Issued in 1978 cc w/ encl:
J. C. Rogerts, Project Manager McGuire Nuclear Station P. O. Box 2178 Charlotte, North Carolina 28242 M. D. McIntosh, Plant Manager McGuire Nuclear Station P. O. Box 488 Cornelius, North Carolina 28031 MCb J. E. Smith, Station Manager Oconee Nuclear Station P. O. Box 1175 Seneca, South Carolina 29678 7912130 N bcf I
UNITED STATES NUCLEAR REGULATORY COMMISSION OITICE 07 INSPECTION AND ENFORCEMENT WASHINGTON, D. C.
20555 July 20, 1978 IE Circular No. 78-15 TILTING DISC CHECK VALVES FAIL TO CLOSS 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 force of gravity when installed in a horizontal pipe.
The manufacturer did not determine the reverse flow necessary to close the improperly installed valve. The check valve is located in the Low Pressure Safety Injection System as the first valve 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 indicated to them possible implications of vertical installations.
It should be noted that similar problems may arise with tilting disc check valves from other manufacturers.
Tilting disc checkvalves can be designed for either horizontal or vertical piping but not for both.
Improperly installed tilting disc check valves will not function properly.
All holders of tperating licenses or construction permits should be aware of the potential for malfunction of safety-related systems caused by improperly positioned tilting disc check valves.
Consideration should be given to the importance of verifying that all such valves in critical systems are installed only in the orientation specified by the manufacturer.
i 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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w IE Circular No. 78-15 July 20, 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 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 Quantities of Reactor OLs, cps, Low Specific Activity Fuel Cycle, Radioactive Material Priority I Material for Transptrt and Waste Disposal Licenses 78-04 Installation Error That 5/15/78 All Holders of Could Prevent Closing of Reactor OLs or Fire Doors cps 78-05 Inadvertent Safety Injection 5/23/78 All Holders of During Cooldown Reactor OLs or cps 78-06 Potential Common 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 cps 78-09 Arcing of General Electric 6/5/78 All Holders of Company Size 2 Contactors cps Enclosure Page 1 of 2
IE Circular No. 76-15 July 20, 19'8 LISTING OF IE CIRCULARS ISSUED IN 1978 Circular Subject Date of Issued to No.
Issue 73-10 Control of Sealed 6/14/78 All Medical Sources Used in Licensees in Radiation Therapy Categories G and G1 78-11 Recirculation M-G 6/15/78 All Holders of Set Overspeed Stops BWR OI.s or cps 78-12 HPCI Turbine Control 6/30/78 All !!olders 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, CA, FL, GA, LA, MS, SC 78-14 HPCI Turbine Reversing 7/12/78 All Holders of BWR Chamber Hold Down Bolting OLs or cps for plants with a HPCI Terry Turbine excepting Duane Arnold and Monticello i
Enclosure Page 2 of 2