ML20037B604

Requests Licensees W/Operating BWRs to Review Records for CY77 & Respond within 30 Days,Stating That Either No Events Occurred or That within 90 Days of Receipt of Ltr Summary Tabulation of Events Will Be Provided

ML20037B604
Person / Time
Site:	Dresden
Issue date:	09/06/1978
From:	Ziemann D Office of Nuclear Reactor Regulation
To:	Reed C COMMONWEALTH EDISON CO.
References
NUDOCS 8010220727
Download: ML20037B604 (2)

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Connonwealth Edison Company F

1.TTH:

Mr. Cordell Reed E

Assistant Vice President Post Office Box 767 b

Chicago, Illinois 60690 C-entl even:

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A nu:acer of instances of control rods failing to fully insert on screa-have occurred over the past feu years.

The typical reported event

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and then settling back to notch position "02" or six. inches short of p

full insertion.

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It is the staff's understanding that while failura to fully insert to

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the "00" pos'ition has occurred at a number of plants, not all of these l-events have been reported, perhaps because the event was not considered to have sufficient safety significance. Therefore, it is difficult for the staff to determine if instances of control rods failing to insert I

are decreasing or are indicative of a generic problem with potential safety implications. To enable a better understanding of the nunber of facilities affected and any trend in the number of rods failing to insert on each scram, we are requesting all licensees with operating BL?.s to review their records for calendar year 1977. We would appreciate receiving a letter within 30 days that states that either no sucn events occurred at your facilities or that within 90 days of this letter you will provide a sunnary tabulation of the events. For each such event, you should identify the number of reds not fully inserted, the position of the rods, the cause of failure to fully insert and any related ncin-tenance activities. Refercnce to reports that alreaey describe such events is acceptable.

He recrmend that you nalntain an ongoing tabulatic. of any ccditional such events that nay occur during the calendar year 1975. Should our 4

evaluation of the 1977 data warrant, we may nete a similar request for data covering calencar year 197P..

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- m This request for generic infomation was approved by GAD under a blanket

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clearance number B-160225(R0536); th'is clearance expires June 30, 1981.

fl:., m Sir.cerely.

Original Si.7,d by:

-Dennis L. Ziemann, Dennis L. Zieaann, Uhief h5e Operatino Reactors Branch r2 Division of Operating Reactors cc: See next page UTION:

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P' 'Connor:sh WRussell DLZiemann 9/ 6 /78,__.

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