ML20234D622
| ML20234D622 | |
| Person / Time | |
|---|---|
| Site: | 05000000, Quad Cities |
| Issue date: | 04/13/1972 |
| From: | Skovholt D US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Seiss C Advisory Committee on Reactor Safeguards |
| Shared Package | |
| ML20234A777 | List:
|
| References | |
| FOIA-87-40 NUDOCS 8707070280 | |
| Download: ML20234D622 (2) | |
Text
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W UNITED STATES g ^
ATOMIC ENERGY COMMISSION ~
i d b..x*s WASHINGTON. D.C. 20545
'O April 13,.1972 7 M 1101 Docket No. 50-254
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P.'lSORY COMMlf TEE ON LU.CTC A SAFEGUARDS Dr. Chester P. Siess Chaiman, Advisory Comittee on Reactor Safeguards U. S. Atomic Energy Commission Washington,'.D. C.
20545
Dear Dr. Siess:
Sixteen -(16) copies of the following are transmitted for the -
Comittee 's information:
-TWX from Commonwealth Edison Company dated April 12, l
1972, reporting an incident involving the reactor core isolation cooling system of Quad Cities Unit No. 1.
Sincerely, fli
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Donald J. Skovholt Assistant Director f +r Reactor Operations Divt.sion of Reactor Licensing
Enclosures:
As stated I
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SUPPIEENT No. ' 152 CATBOORY B Quad Cities HrGI & ACRS Water Hammer 4/20/72 By WK dated 4/5/72, howealth Edison reported a water kw which occurred during surveillance testing of the Unit 1 RER system and left one loop of the containment spray system in-i operable. The reactor will ransin shut down until repairs and testing have been completed.
No ACRS action is recommended although more information may be available by the time of the May 1972 ACES meeting.
The enclosed material may be discarded after your review.
M*
i IDG1 Technical Specifications 4/20/72 l
By letter dated 4/7/72, Commonwealth Edison applied for a change i
in Tech. Specs. which would allow the scram setpoint on the turbine control system oil pressure to be reduced from 1100 to 900 psig. At 1100 pais sperious scross occurred at Dresden 2 6 3 due to the proximity to the normal operating pressure -- 1250 psig; at 900 psig there is adequate margin between the trip point and the pressure at which the control valves begin to close -- 600 peig.
It is also noted that identical changes were approved for Dresden 2 63.
19G1 RCICS Failure 4/20/72 A Commorarealth gdison TWK dated 4/11/72, reported failure to operate of the reactor core isolation cecling system during a start-up test. No further details were included, but some
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elaboration can be expected by letter.
No ACRS ection is recommended.
The enclosed material may be discarded after your review'.
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Form AEC-33 8 (Rev. 9-53) AECM 0240 u, s, covenuggy pgg,TINo orrict i sevo o. 4es.34s