ML20040E726

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Responds to NRC 811019 Ltr Re Violations Noted in IE Insp Rept 50-228/81-03.Corrective Actions:Main Effort of Redesigning Shield & Restacking Blocks Completed.Overall Work Will Be Completed by 820228
ML20040E726
Person / Time
Site: Aerotest
Issue date: 01/25/1982
From: Newacheck R
AEROTEST OPERATIONS, INC.
To: Sternberg D
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML20040E725 List:
References
NUDOCS 8202050287
Download: ML20040E726 (2)


Text

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OME!\'Eg p% m e AEROTEST OPER ATIONS, INC.

  1. 4 3455 FOSTORIA WAY SAN RAMON, CALIFORNIA 94583).1415thp374 4248

~ "At 46 tre r r i: y 25 January 1982 G"~Z l '

D. M. Sternberg, Chief Reactor Operations Projects Branch U. S. Nuclear Regulatory Commission Region V 1450 Maria Lane, Suite 260 Walnut Creek, California 94596

Reference:

Inspection Report 50-288/81-03; Docket No. 50-288

Dear Mr. Sternberg:

The referenced inspection report discussed various upgrading actions Aerotest agreed to complete as a result of Mr. D. J. Willett's inspection on September 24, 25, and 28 of 1981. One of the items, noted in item 2 of the " Details", deals with our agreement to make changes in our concrete block shielding to make them more earthquake resistant to falling. The main effort of redesigning the shield and restacking the blocks to provide an interlocking arrangement has been completed. However, we may not complete the steel work prior to the end of our stated completion date of January 31, 1982.

The specific steel frame along the wall separating the reactor and the control room could be easily finished by this date; however, we are installing a more extensive steel frame around the top of all the blocks. To make certain we have adequate time to finish this work we will need an extension of one month to the end of February. We believe this extension should be acceptable since, 1) we have completed the interlocking restacking, which improves substantially the integrity of shielding and its resistance to falling, and, 2) the inclusion of more extensive steel bracing will improve the overall shielding resistance to falling.

Unless we hear from you to the contrary, we will proceed with our present plan to complete the overall work by 28 February 1982.

A second item should be brought to your attention although it has no safety implications. In paragraph 1 of item 1 of the " Details" section of the referenced report, a regulated power supply is mentioned. In this case, we agreed to a December 31 completion date. Due to circumstances beyond our control, this installation has not been finalized. The uninterruptible power supply (UPS) was received, but when connected to the battery section, the cable shorted and rendered the system inoperable. The manufacturer replaced the cable; however, several components were damaged. After numerous telephone calls and repairs, the manufacturer's representative came to the 8202050287 820128 A SUBSIDI ARY OF .A PDR ADOCK 05000288 G PDR

[.- J plant to analyze and repair the system. As a result of his analysis he requested that we return the unit to their plant. It has now been fully tested on the test bench and returned to us. We have again placed the system in operation this date but cannot yet state that it functions properly until we observe it a few days.

The spurious trips attributed to line fluctuations were finally resolved bt replacement of the compensated ion chamber. Thus, our major problem j was resolved before the new UPS was received. We have high hopes that the UPS will isolate and terminate all the line noise problems. We will keep you informed of the progress in this matter.

4 Very truly yours, AER0 TEST OPERATIONS, INC.

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