ML18139A266
| ML18139A266 | |
| Person / Time | |
|---|---|
| Site: | Surry, North Anna  |
| Issue date: | 05/14/1980 |
| From: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | Ferguson J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| References | |
| NUDOCS 8005290197 | |
| Download: ML18139A266 (6) | |
Text
e UNITED STATES e
NUCLEAR REGULATORY COMMISSION REGION II In Reply Refer To:
RII:JPO 50-338, 50-339 50~4 50-405
~o Sso-2s1:=:::>
101 MARIETTA ST., N.W., SUITE 3100 ATLANTA, GEORGIA 30303 MAY 1 4 1980
,Virginia Electric and Power Company
'Attn:'. J. H. Ferguson
- Executive Vice President-Power P, O. Box 26666 Richmond, Virginia 23261 Gentlemen:
The enclosed Circular No. 80-12, is forwarded to you for information.
If there are any questions related to your understanding of the suggested actions, please contact this office.
Enclosures:
1 *. IE Circular No. 80-12
- 2.
List of Recently Issued IE Circulars Sincerely,
~~-
James~ O'Reilly~
Director
- ~-.r_......-
Virginia Electric and Power Company cc w/encl:
e W.R. Cartwright, Station Manager Post Office Box 402 Mineral, Virginia 23117 P. G. Perry Senior Resident Engineer Post Office Box 38 Mineral, Virginia 23117 J. L. Wilson, Manager Post Office Box 315 S_urry, 'Virginia 23883 MAY 1 4 198D e
UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 May 14, 1980 e
SSINS No.: 6830 Accession No.:
8005050052 IE Circular No. 80-12 VALVE-SHAFT-TO-ACTUATOR KEY MAY FALL OUT OF PLACE WHEN MOUNTED BELOW HORIZONTAL AXIS Description of Circumstances:
Tenness~e Valley Authority has identified and reported to the NRC a nonconformance 01,1 a Bettis Robot-Arm actuator installed on a Pratt Butterfly valve at the Sequoyah nuclear_ 'plant.
It is reported (ref. attached 10 CFR 50.55(e) report) that a valve became inoperable when the valve-shaft-to-actuator key fel] out of place. It is further noted that the orientation of this valve assembly was such that the operator was on the bottom of the valve (below the horizontal axis).
The Pratt Butterfly Valve furnished with Bettis actuator is designed with a press-fit keyway connection valve/actuator.
We believe other manufacturer's connections may be of similar construction and therefore subject to this failure mode.
On May 1, 1980, Pratt Company sent letters to their customers who have these connec-tions (enclosed list). They recommended that their customers review their installa-tion of such connections, and if the keyway is oriented below horizontal, make one of the following field modifications:
- 1.
Add a spacer bushing, or shim plate to fill the void between the top of the shaft and the indicating plate on the actuator.
- 2.
Locally upset the end of the valve shaft in the area of the keyway using a hand punch in such a way that the key could not work loose.
- 3.
_Install new keys of longer length which extend above the end of the valve shaft whereby the key is up to the actuator plate and cou.ld not slip down if inverted.
Recommended Action for Licensee Consideration:
We request that all plants make the above recommended inspection of all connections simi1ar to the above described Bettis/Pratt connection, whether or not supplied by those particular manufacturers.
If connections are found* that are susceptible to
.failure, one of the above recommended actions or other appropriate action should be taken to correct the potential problem.
No written response to this Circular is required. If you desire additional informa-tion regarding this matter, contact the Director of the appropriate NRC Regional Office.
Attachments:
- 1.
10 CFR 50.55(e) Report
- 2.
List of Addresses
e ATTACHMENT 1 SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 NCR 19P 10 CFR 50.SS(e)
REPORT NO. 1 (FINAL)
LOOSE KEY IN BETTIS ROBOT-ARM VALVE ACTUATORS Description of Condition A containment isolation valve in Unit 1 became inoperable when the key which locks the actuator to the valve shaft fell out of place.
Thi~ problem could occur with Bettis Robot-Arm valve actuators (model numbers 732C-SR80, 721C-SR60, 521C-SR§O, CB525-SR60) when installed upside down or sideways.
With the valve shaft mounted below horizontal, there is a potential for the.key to work itself.. loose.
Safety Implications If the valve actuator were to fall out, it would result in a loss of valve control.
Since these valve actuators are on safety-related valves, this condition could have adversely affected or reduced the redundancy of safety-related systems.
Corrective Action TVA has identified 51 suspect operators in the Purge Air System, Emergency Gas Treatment System and the Chilled Water System.
Those operators that are installed so that the key can work loose will have spacer bushings installed in the actuator as recommended by the vendor.
Installation of the spacer bushings will be completed before fuel loading.
All TVA design project managers are being asked to ensure that this problem does not occur at other TVA nuclear plants.
e e
ATTACHMENT 2 LIST OF ADDRESSEES FOR MAY 1 LETTER FROM HENRY PRATT COMPANY Metropolitan Edison - Three Mile Island #2 Arkansas Power & Light Arkansas Nuclear One 1 Wisconsin Public Service - Pioneer Service Kewaunee Northern States Power - Prairie Island 1 & 2
- Balti~ore Gas & Electric - Calvert Cliffs 1 & 2 Florida Power Corporation - Crystal River #3 Florida Power & Light - St.
Lucie #1 & 2 Toledo Edison - Davis-Besse #1 I
Alabama Power Company - Joseph M. Farley 1 & 2 Tennessee Valley Authority - Sequoyah 1 & 2 Pennsylvania Power & Light - Susquehanna 1 & 2 Mississippi Power & Light - Grand Gulf 1 & 2 Cleveland Electric Illuminating Company - Perry 1 & 2 Commonwealth Edison Company - Zion 1 & 2 Rochester Gas & Electric - Robert E. Ginna 1 Westinghouse Hanford/FFTF Westinghouse~ Phillipines Northeast Utilities - Millstone #3 Tennessee Valley Authority - Stride
... ~, __,_... --:*.---,-..
IE Circular No. 80-12 May 14, 1980 e
RECENTLY ISSUED lE CIRCULARS Circular No.
80-12
- 80-11 80-10 80-09 80-08 80-07 80-06 80-05 80-04 80-03 02 Subject Valve-Shaft-To-Actuator Key May Fall Out of Place when Mounted Below Horizontal Axis Emergency Diesel Generator Lube Oil Cooler Failures Failure to Maintain Environmental Qualification of Equipment Problems With Plant Internal Communications Systems BWR Technical Specification Inconsistency - RPS Response Time Problems with HPCI Turbine Oil System Control and Accountability Systems for Implant Therapy Sources Emergency Diesel-Generator Lubricating Oil Addition and Onsite Supply Securing of.Threaded Locking Devices on Safety-Related Equipment Protection from Toxic Gas Hazards Nuclear Power Plant Staff Work Hours Date of Issue 5/14/80 5/13/80 4/29/80 4/28/80 4/18/80 4/3/80 4/14/80 4/1/80 3/14/80 3/6/80 2/1/80 e
Enclosure Issued to All holders of a power reactor 01 or CP All holders of a power reactor OL or CP All holders of Reactor OLs and CPs All holders of a power reactor 01 or CP All General Electric BWR's holding a power reactor 01 All holders of a power reactor 01 or CP Medical licensees in Categories G and Gl All holders of a power reactor 01 or CP All holders of a power reactor 01 or CP All holders of a power reactor OL All holders of Reactor OLs, including research and test reactors, and CPs