ML20235E014

Informs AEC of Status of Vibration Program & Iowa-Illinois Gas & Electric Evaluation Justifying Program W/Remaining Sensors.Results of Investigation Show That Initial Program to Measure Two Structural Areas,Remains Feasible

ML20235E014
Person / Time
Site:	Quad Cities, 05000000
Issue date:	06/20/1972
From:	Butterfield L COMMONWEALTH EDISON CO.
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20235B311	List: IA-87-111, Submits Rept on Plant,As Discussed in ACRS 150th Meeting on 721012-14.Listed Items Can Be Resolved During Const & Facility Can Be Constructed W/Reasonable Assurance for Operation W/O Undue Risk to Public Safety IR 05000254/1972009 IR 05000358/1972003 IR 05000358/1973001 IR 05000358/1973002 IR 05000358/1973003 IR 05000358/1973005 IR 05000358/1973006 IR 05000358/1973007 IR 05000358/1974001 IR 05000358/1974002 IR 05000358/1974003 IR 05000358/1975004 ML20235B308 ML20235B364 ML20235B401 ML20235B405 ML20235B424 ML20235B456 ML20235B461 ML20235B465 ML20235B477 ML20235B488 ML20235B507 ML20235B552 ML20235B582 ML20235B585 ML20235B588 ML20235B605 ML20235B618 ML20235B623 ML20235B649 ML20235B656 ML20235B662 ML20235B670 ML20235B679 ML20235B683 ML20235B687 ML20235B702 ML20235B708 ML20235B713 ML20235B714 ML20235B718 ML20235B720 ML20235B730 ML20235B734 ML20235B748 ML20235B754 ML20235B762 ML20235B764 ... further results
References
FOIA-87-111 NUDOCS 8709250450
Download: ML20235E014 (3)

Text

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June 20,, 1972 g

} l Mr. A. Giambusso ,

Deputy Director, Reactor Projects U.S. Atomic Energy Commission Washington, D.C. 20545 * *

Subject:

Quad-Cities Unit i Vibration Instrumentation

Dear Mr. Giambusso:

Several of the vibratica instruments contained in Quad-Cities Unit 1 reactor vessel have become unusable during the early stages of the'startup test program due to the various operations with the reactor vessel head. The purpose of this letter is to inform you of the status of the vibration program ac Quad-cities Unit 1 and Commonwealth Edison's and Iowa-Illinois Gas and Electric's evaluation justifying the program with the remaining sensors.

The vibration program, as discussed in the Quad-Cities startup test instructions, utilizes acceleration and displacement sensors on the shroud, strain gages on two of the riser pipe brace and displacement sensors on two jet pumps. The location and , ,

status of these sensors are tabulated below:

4 Location Status y

1. Shroud Acceleration sensors A-1 at 134 Good b7dh A-2 at 2240 Good O Displacement sensor D-3 at 2280 Bad (o

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2. Riser Pipe on: Strain gages S1,S2,53 at 188 All bad Co Jet Pump On bottom side of S4,SS,56 at 212 64 bad, S5&S6 good Assembly riser brace

3. Jet Pump: Displacement sensors on throat of Both good Jet pumps JP-11, JP-12 0

8709250450 870921 PDR FOIA MENZ87-111 PDR

Jommonwezith Edison Compai,.

. 6 Mr. A. Giambusso June 20, 1972 As indicated in Quad-Cities FSAR Amendment 13, Question /

Answer 3.3, Amendment 16, Question / Answer 3.4, and Amendment 19, General Electric Company has sufficient confidence in their overall vibration program for BWR's to consider any vibration program for Quad-cities to be superfluouar however, to be responsive to both AEC and ACRS concerns in this area, Commonwealth Edison Company, Iowa-Illinois Gas and Electric Ccapany and the General Electric Company agreed to provide a confirmatory vibration program for both units. A detailed generic presentation was given to the AEC in San Jose, Californis on 5/12-13/71. As was indicated at that time, all General Electric vibration programs have built-in redundancy designed to handle a certain amount of service losses expected for such sensitive instrumentation. Since a critical factor which determines service losses ic the frequency with which the reactor vessel head is removed (thereby causing further movement of the sensitive instrument lines) , limited losses of vibrction instrumentation were sustained when the reactor vessel head of Unit 1 was last removed to renew sources for startup.

a thorough investigation of the available vibration instrumentation has been made at Quad-cities. The results of this I investigation show that the initial program to measure two structural areas, the jet pump assembly and the shroud asrembly remains feasible.

An indicated previously, each of these assemblies was instrumented l

with redundancy because it was expected that all such instrumentation might not survive such occurrences as head removal or service testing.

Although some of this redundancy has been lost (i.e., instrumentation on one riser brace), both assemblies have confirmatory type instruments still functioning (i.e. , shroud, one jet pump and one jet pump riser brace) .

Additionally, Quad cities Unit 2 reactor vessel is instrumented like Quad-cities Unit 1 and measurements will be taken on Unit 2 in its startup test program which will be representative of Unit 1 and will assist in verifying the adequacy of the Unit 1 re stilta.

Dresden Unit 3 contained similar instrumentation with the exception that Dresden Unit 3 did not have a displacement sensor on the shroud. The results of the Dresden Unit 3 vibratbn tests were satisfactory and will be part of the test program results submitted in accordance with the requirements of the Technical Specifications.

L_ ____1 _ __ _ _ _ _ _ _ _ _ _ __ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

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u-Commonwealth Edison Compai., !

f Mr. A. Giambusso June 20, 1972 Thereforn, with the satisfactory results of Dresden Unit 3 and the startup test program scheduled for Quad-cities Unit 2, comanonwealth Edison Company and Iowa-Illinois Gas and Electric Company are satisfied that a ureful evaluation of the test can be made on Quad-Cities Unit 1 utilizing the remaining usuable vibration instruments. ;

No additional installation of-instruments or testing beyond the scope of the present test program is contemplated at this time.

Three originals and 19 copies are enclosed for your use.

Very truly yours,

-3% \

L. D. Butterfield, Jr.

Nuclear Licensing Administrator l

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