Bulletin 71-01: Niagara Mohawk Power Corporation
IEB 71-01 November 24, 1971 UNITED STATES ATOMIC ENERGY COMMISSION DIVISION OF COMPLIANCE REGION 1 970 BROAD STREET NEWARK, NEW JERSEY 07102 Niagara Mohawk Power Corporation Attention: Mr. F.J. Schneider, Vice President-Operations 300 Erie Boulevard West Syracuse, New York 13202 Gentlemen: We recently received information, from a licensee operating a boiling water reactor, which may relate to the performance of the main steam isolation valves in your facility. The information is as follows: During a planned test, one main steam isolation valve failed to close fully due to interference in the hydraulic dash pot (Model N2K) of the valve operator caused by a segment of a broken cushion spud. The valve was an air operated Atwood and Morrill valve with a Hydro-Line Manufacturing Company operator (Model 612-003-1B). The licensee's investigation of the condition of the other valve operators for the main steam isolation valves in the plant disclosed that one additional operator had a cracked cushion spud. It is requested that you provide this office within 10 days, in writing, with the following information: a. Whether valve(s) equipped with the described make and model operator are installed in a safety system of your facility. b. If the answer to the above question is in the affirmative, provide the date when each valve operator will be inspected. c. If the results of the inspection indicate the existence of the deficiency described above, submit the specific findings from your inspection to this office within 10 days from the date of the inspection, together with the description of the corrective action taken or planned, including the scheduled completion date of your planned action. Should you have any questions concerning this matter, we will be pleased to discuss them with you. Very truly yours, James P. O'Reilly Director cc: A. Burt, Station Superintendent
Page Last Reviewed/Updated Tuesday, March 09, 2021
Page Last Reviewed/Updated Tuesday, March 09, 2021