ML19326B501
| ML19326B501 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 12/09/1971 |
| From: | Jennifer Davis US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Phillips J ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 8004150837 | |
| Download: ML19326B501 (3) | |
Text
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DIVISION OF COMPWANCC
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In Reply Refer to:
December 9,1971 C0:II:50-313 and 368 Arkansas Power and Light Company Attn:
Mr. J. D. Phillips Vice President and Chief Engineer Sixth and Pine Streets Pine Bluff, Arkansas 71601
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Gentlemen:
We recently received information from two licensees operating pressurized water reactors which may relate to the future performance of reactor scram circuit breakers in your facility.
This letter provides you with a copy of the body of the letter that was forwarded to the licensees of operating pressurized water reactors by cognizant Regional offices of the Division of Compliance.
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No action on your part is required; however, we will review this matter during our continuing inspection program.
Should you have any questions concerning this metter, we will be pleased to discuss them with you.
mVery truly yours, f
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%.J BODY OF LETTER TO LICENSEES OF OPERATING PRESSURIZED WATER REACTORS We recently received information relating to the performance of reactor i
scram circuit breakers from two licensees operating pressurized water reactors. The reactor scram circuit breakers are Westinghouse, type DB-50.
The information is as follows :
Plant A Three failures to operate occurred at this facility. Each failure involved the undervoltage trip attachment. No connon mode of failure could be identified. One failure was attributed to a broken latch pin, the second to mechanical binding of the trip lever, and the cause of the third was not specifically identified.
Plant B Two of the two reactor scram circuit breakers failed to trip on undervoltaga riuring surveillance testing. The failure to trip was attril-
.rt accumulation on exposed linkages. This failure c
.a after completion of inspection of the scram j
g breakers to determine the applicability of the problems observed at Plant A.
It is requested that you inform this office within ten days, in writing, whether reactor scram circuit breakers of the described make and model are installed in your facility. If the answer to this question is in the affirmative, provide the date when each of your reactor scram circuit breakers will be inspected and tested.
In addition, it is requested that you inform this office within ten days, in writing, following completion of your inspection and test, of youc specific findings, including a description of corrective 7
action taken or planned and the scheduled completion date of planned actions.
Should you have any questions concerning this matter, we will be pleased to discuss them with you.
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