Text

Revised Page 2 to Insp Rept 50-416/87-02,correcting Typos
	ML20206C500
Person / Time
Site:	Grand Gulf
Issue date:	04/02/1987
From:	; NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:	;
Shared Package
ML20206C486	List: ML20206C483; ML20206C500;
References
	50-416-87-02, 50-416-87-2, TAC-61930, NUDOCS 8704130070
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, ,

. APR 0 01987

Corrected Page 2 2

April 2, 1987

5.

Review of Test Results and Witnessing of Core Stability Testing

The inspector performed a review of Technical Special Test Instruction

IJ11-86-002-0-S. The test

setup was reviewed and the methodology of

stability testing was discussed with ORNL and ANFC representatives. A

meeting was held to discuss the sequence of testing. A determination was

made that two test points out of the original five suggested would not be

tested due.to core limitations.

The test placed the reactor in -:onditions corresponding to regions of the

power-flow map with estimated decay ratios of 0.6 to 0.9. The test measured

actual core stability and compared it to the predicted values. Data was

taken on GETARs for later analysis and with ORNL equipment for real time

analysis of core stability.

it was for data gathering only.The test did not have acceptance criteria, as

~

The results of the test are to-be the basis

for determination of possible future operating restrictions for the reactor.

L. Phillips, Section Leader, RSB/ DBL /NRR, was also present to witness -

testing.

~

.- -

Stability measurements taken dc fng the testing at the selected test points

ranged from decay ratios .0.09.t0.03 at 100% power and 100% flow to

0.28 0.15 at 52% power and 39% flow. In order to obtain one flow / power

point,

flow map.the reactor had to be taken temporarily into Region IV of the power

Stability in this region

noving through Region IV showed actual decay ratios ofbased upon measurementl

0.31 0.10. The decay

ratios measured at

ratios of 0.6 to 0.9. the time of testing were well below the estimated decay )

Within the areas inspected no violations or deviation were identified.

l

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8704130070 870402

PDR ADOCK 05000416 .

ML20206C500