ML19338E430
| ML19338E430 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 10/27/1965 |
| From: | Hoyt H COMMONWEALTH EDISON CO. |
| To: | Boyd R US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| NUDOCS 8009290561 | |
| Download: ML19338E430 (3) | |
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Mr. Roger S. Boyd, Chief 7J Research and Power Reactor Safety Branch U. S. Atomic Energy Commission L
Washington, D. C.
Dear Roger:
This letter is to confirm our telephone conversation of October 18, 1965, respecting the status of reactor control rod drive J 2 of Unit 1 of Dresden Nuclear Power Station, referred to in our letter of October 14, 1965 Before starting to bring the reactor to criticality last Saturday, October 16, shut down margin tests were performed on the cold (1200F) xenon free core and it was verified that, with control rod J-2 fully withdrawn and control rod C-9 at notch 8 the reactor would be suberitical by a margin of at least 0.014 K.
Later that day during the process of bringing the reactor to criticality, although difficulty was experienced in withdrawing control rod J 2 at nomal actuating pressures, full withdrawal to position 12 was obtained by using increased actuating pressures.
Early Sunday morning, October 17, with the reactor coolant heated up to 546 F (1,000 psi) J-2 responded in a normal manner when given the insert signal and scracmed properly when given the scram signal but it could not be withdrawn at normal actuating. pressure.
Despite the fact that control rod J 2 was fully inserted, the operation of the reactor was continued to provide the steam necessary for starting up and running the turbo-generator to determine that the drain line from the high pressure turbine had been repaired. Upon verification that this repair had been accomplished, the plant was shutdown and the reactor cooled sufficiently to permit plugging a condenser tubo, in which cooling water in-leakage had been discoverod
, shortly before t,he turbo-generator start-up, as well as to allow further attempts at J-2 withdrawal.
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When the roactor had cooled to approximately 392 F (211 psi) withcirawal of control rod J 2 was accomplished.
In order to avoid joopordizing the capability of establishing symmetrical rod patterns which impose the least distortion of power distribution and since it had been verified that the shutdown criteria specified in DIR-2 could be satisfied with control rod J-2 fully withdrawn, J-2 was valved out of service and de-energized at notch 12.
Plugging off of the leaking condenser tube having bccn completed, the plant was restored to regular service when its turbo-generator was synchronized onto the cou:pany's electric system at 5:05 A. M. on October 18, 1965 We have prepared an additional operating order which utilizes a separate log to provido a ready reference record on our regular monitoring of control rod drive operation.
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Very truly yours,
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. K. Hoyt Superintendent Dresden Nuclear Power Station HKH:jjk 1
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