ML17252A456
| ML17252A456 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 09/08/1978 |
| From: | Stephenson B Commonwealth Edison Co |
| To: | James Keppler NRC/RGN-III |
| References | |
| 78-033/03L-0 | |
| Download: ML17252A456 (2) | |
Text
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Comm.ealth Edison Dresden ear Power Station R.R. #1.
REGULATO' DOCKET AU OOPY S!
co Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr 1178-1257 James G. Keppler, Regional Director September 8, 1978 Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137
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Reportable Occurrence Report fl78-033/03L-0, Docket //050-249 is hereby submitted to your office in accordance with.Dresden Nuclear Power Station *Technical Specification 6.6.B.2.(a), reactor protection system or engineered safety feature instrllinent settings which are fqund to
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~ t be less conservative than those established by the technical specifications but which do not prevent the.fulfillment of the functional requirements of affected systems..
. nson Station Superintendent Dresden Nuclear Power Station BBS/deb Enclosure cc:
Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC
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1 Q LICENSEE EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) i 1
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8' 9 I LICENSEE CODE 14 15 LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 CON~T/
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DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80
.:,;*- EVE~T DESCRIPTION AND PROBABLE CONSEQUENCES@
@ID 'I Wh~le performing surv. DIS 250-1, MSL Hi Flow Isol. Sw.
dpis 3-261-2C tripped at I
CD]:Jli3~.5 psid.
(T.S. limit</= 115.0 psid at 120% Flow; Table 3.2.1).
The 16 MSL Hi I
CQ:ill* I Flpw Isol. Sw. 's provide containment isolation whenever primary integrity required.
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[~JII I sa:fety. significance minimal because both trip sys. were operable and would have l
EQI[J is'olated containment at 111.5 psid, conservative to T.S. limit of 115 psid.
Similar jIE) I ev~nts ref. in _LER. f/050-249/1977'-4; 78-022/03L-O, 78-027/03L-0 & 78-028/03L-0 also
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a SYSTEM CODE I II B!@
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\\~;REPORT Ll7 ! 8 I
- NUMBER 21 22 CAUSE CAUSE CODE SUBCODE w@ w@
11 12 13 SEQUENTIAL*
REPORT NO.
! o I 31 31 COMPONENT CODE IIN Isl Tj*RI ul@
18 OCCURRENCE.
CODE' I o I 3 I 23 24 26 27 28 29 COMP.
VALVE SU8CODE.
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. 19 20 REPORT TYPE LU 30 1-i 31 ACTION FUTURE.
EFFECT SHUTDOWN r::::;..
ATTACHMENT NPRD-4 FORM 5UB.
PRIME COMP.
SUPPLIER REVISION NO.
L2J 32 COMPONENT MANUFACTURER I
80 TAKEN ACTION
. ON PLANT METHOD HOURS ~-
SUBMITTED
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36 37 40 41 l!Ll@ uu0* l Bl o I 8 I ol@
42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS.@
I C~use - bent indicator pointer dragging across-face. plate prohibiting proper operation.~
cm:J 1PO:inter had been straightened after similar occurrence last month but apparent metal i
.I fa.'tique resulted in repetitive bending.
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Pointer replaced.
Sw reset to Dresden setpt. I QTI] I 110+/-2 psid and retested **sat. on 8/28/78 for verification of fix.
Monthly testing I
- of MSL sw's will continue.
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i FACILFTY STATIJS 80 GE W@
METHOD OF
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DISCOVERY DIS_COVERY DESCRIPTION \\(31 l.J!JG2)1.__~S~u~r~v~e~i~l~l~a~n~c~e'--'T~e~s~t~i~n~g2--~~~--,~~~---'I
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M LOCATION OF RELEASE @
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NA 80