ML20234C089
Text
,__
i
[ ~'
[3, '*'" 4 UNITED STATES
' *l ATOMIC ENERGY COMMISSION
- S, L WAS9mGTON. DC. 20545 gg{NEC s
,,,,n,
May 7, 1973 Docket No. 50-254 1,hh(rM$a COMM.
TTEE ON i J 31c 3AFEGUARDS Mr. Harold G. Mangelsdorf Chairman, Advisory Committee on Reactor Safeguards U. S. Atomic Energy Commission Washington, D. C.
20545
Dear Mr. Mangelsdorf:
Sixteen (16) copies of the following are transmitted for the Committee's information:
Letter from Commonwealth Edison Company dated April 18, 1973, furnishing the details of exceeding the limiting condition of operation for Quad-Cities Unit 1 reactor coolant conductivity.
TWX from Commonwealth Edison Company dated April 27, 1973, reporting that during routine calibration of the low level scram sensors, three switches were found to have drifted t-beyond the set point required by the Quad-Cities Unit 1 Technical Specifications.
Letter to Commonwealth Edison Company dated May 2, 1973, requesting justification for treating " Summary of Results at Quad-Cities 1" regarding vibration test program as proprietary information.
Sincerely, i
?
h,yf k Donald J.
vholt Assistant Director for Operating Reactors Directorate of Licensing
Enclosures:
As stated meu u. m a am vou a
i 8707060328 e70610 PDR FDIA j
THOMASB7-40 PDR I
f g.
J llo
>Q up
-kb 0FFICIAL USE ONLY jE "
CATEGORY B M.T[' * '
1 SUh N NO. 165 P.;
~
Quod Cities Unit 1 May 29, 1973 R 4 y Dk'
SUBJECT:
PROPRIETARY DATA DO AEC/L letter dated May 2,1973 challenges the proprietary nature of data supplied by GE in the docusient entitled "Susanary Results ACRS at Quad-Cities 1".
If the proprietary nature of the report is not justified in 30 days the AEC will make it public.
l No ACRS action is recommended.
The enclosed material may be discarded af ter your review.
(JCM)
SUBJECT:
PRESSURE SWITCH SET POINT DRIFT DO Commonwealth Edison Co. TWX dated April 27, 1973 reports that three reactor low water level scram pressure switches had drif ted out ACRS of calibration. They were recalibrates and returnsd to service.
No ACRS action is recommended.
3 The enclosed material may be discarded af ter your review.
(JCM)
SUBJECT:
HICH REACTOR COOLANT CONDUCTIVITY DO Commonwealth Edison Co. letter dated April 18, 1973 reports that MB on April 6 the primary coolant conductivity exceeded Technical Specification limits. The increase is attributed to an inadvertent addition of air during a shifting of flow thru the cleanup de-mineralizes.
No ACRS action is recommended.
The snelosed material may be discarded af ter your review.
.I'. "J O J
- f;,_;a -
m w.;
'dtM) l'ILE : QUAD CITIES"#1' ACRS omcc >
WABurns/ peg OFFICML USE ONLY suRNAuc >
5/29/73 omn Form AEC-318 (Rev.9 53) AECM 0240 oro
.43-16-siseH seH7s
/:
m.
N g-1 *.*.d
. OFFICIAL jlgE, g&y.
~
l 8UFF12 MENT NO.166 CATE00KI B ound Cities 1 & 2 Jens S 1978 wi r[.
v
SUBJECT:
DESIGN WIRING ERAS IN LOQP SEIACT IAGIC CIRCE 121Y Licensee letter, B. B. Stephenson to A. Giambasso dated WRS May 11, 1973 reports wiring error (due to incorrect circuit DO diagram) which could have prevented proper loop selection.
MB Cenpinuancis.: Licensee reports that.the Wing arrer would have caused ECCS difficulty only during operation with one recirc pump and in the event of a IACA in that loop.
gg,e.: Operation with oma recirc pump prohibited until aan-e pletion of circuit corrections (completed May 5,1973).
Note: DL (Riesland) reported that this wiring arrer uma discovdred only during the final phases of the startup test program and then only because a test engineer intuitively modified a prescribed test procedure. The wiring of this circuit at the Dresden Station was also checked (same A/E) and verified to be correct. The Monticello circuit was also checked (because of system similarities) and verified to be correc t.
REG now feels that this was a non-generic, isolated inc ident.
No ACRS action recommended.
The enclosed material may be discarded following your review.
NAB) l 3
FILE: Quad Citias 1 S 2..
J CATEGORY B ACRS omet >
-0FFIGMIi-USE--SNLY~
JABurns/pe g j
SURNAME >
6/5/73 DATE>
Form AEC418 (Rev.9 53) AECH 0240 o.o
.4a-is-sicos.: 44a-e7s
k
- (?
0FFICI AL USE ONLY w
SUFFIDENT NO 165 CATEGORY B b
AWNy l{$il l
Quad Cities Units 1 & 2 May 29, 1973 ~
Dresden Units 2 & 3
SUBJECT:
ADDITIONAL INFORMATION REGARDING ROD WORTH MINIMIZER p93 AEC/L letter dated May 2,1973 requests information on the een-i templated modifications to the rod worth minimiser system and on the consequences of thchnical specification requirements for a scram if the rod worth minimiser is not operagile and the reactor is at less than 10 percent power. A reply is requested within 30 deys.
No ACRS action is recommended.
The enclosed material may be discarded af ter your review.
(JCM)
Str8 JECT:
FEEDWATER CON 11tOL SYSTEM MODIFICATIONS SHB DO Commonwealth Edison Co. letter dated April 13, 1973 forwards Revision l' to the "Feedwater Control System Modifications" ACRS special report for these units. The earlier report had er.
roneously identified some feedwater system responses as automatic when, in fac t, theyyhad been manually controlled. This revision describes modifications amede to the systems at Dresden Unit 2 and Quad Cities Unit 2.
Test' results from a full power turbine trip are presented.
No ACRS action is recommended.
The enclosed material should be retained as part of the permanent record.
(JCM)
FILE: QUAD CITIES UNITS.1 & 2 TEGORY B Dresden Units 2Sh 3 ACRS omcE >
JCMcKinley/pel; 0FFICIAL USE ONLY
$URNAME >
DATE>
Form AEC-318 tRev 9 53) AECM 0240 oro
.43-sc~siess.: 446-c7s
.