ML17252A465
| ML17252A465 | |
| Person / Time | |
|---|---|
| Site: | Dresden  (DPR-019, DPR-025) |
| Issue date: | 07/10/1978 |
| From: | Stephenson B Commonwealth Edison Co |
| To: | James Keppler NRC/RGN-III |
| References | |
| Download: ML17252A465 (2) | |
Text
Comm..
- ealth Edison Dresden ear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr. #78-1047 J\\Uy 10, 1978 James G. Keppler;, Regional I;lirector Directorate of Regulatory Operations.- Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road G.len Ellyn, IL 60137 *
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Reportable Occurrence Report #78-027/031-0, Docket #OSO~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 instrument settings which are found to be less conservative
- than those established by the technical specifications but which do not prevent the fulfill~ent of the functional requirements of affected systems.
BBS/kmh Enclosu:r.e nson Station Sup~rintendent Dresden Nuclear Power Station CC:
Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC JUL 1 81978.
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,. NRC mum
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"ff.111d't.'t'l!fm'lft'G'ot.'""°""'t'OMM1'S$'1("1 17-77)
LICENSEE EVENT REPORT**
..,Y -::~~cl~TROL BLOCK: I *.1. 1 * *
- 10.
- (PLEASE PAI.NT olvPE ALL REQUIRED INFORMATION)
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IIILIDIR!sl3IG)lo lo I-lo lo lo lo lo 1-- lo lo 1014111111! 1101 I IG) 7 B
9 LICENSEE CODE 14 15 LICENSE NUMBE~.
. 25 26 LICENSE TYPE JO
- 57 CAT 58 CON'T
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~;~~~~ W©l o I 5 I o I o I o I 2 I 4 I 9 101 o I 6 12 11 I 7 I a '(V lo ! 711 Io I 7 I a I G) 60 61 DOCKET NUMBER 68 69 EVENT DATE i4 75 REPORT DATE BO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@*
I While performing sur'1. DIS 250-1, MSL Hi Flow !sol. Sw. dpis* 3-261-2C tripped at
@JI] I> 130 psid *.
(T.S. limit</=115.9 psid 120% Flow; Table 3~2.1). The.16 MSL Hi Flow
[TITI I !sol switches l)rovide containment isolation protection whenev:er primary integrity.regu!red.
[)))) 1safety significance minimal because both trip sys~.were operable and would have
[))))*!isolated containment at 111.Spsid,.conservative to T.S. limit of 115.9psid. *Similar1
~
I events ref. in LER/1050-249/1977-4 & 78-022/03L-0.
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7 B 9 BO SYSTEM CAUSE CAUSE COMP.
VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE
.* SUBCODE I I IB~I@ l§J@ 'LLJ@-1 I IN Is IT IR I u-1@ L!..J* tu@*;:-~ ~...
9 10 11 12 13 18 19 20 I:":;\\
LE R/RO CV ENT YEAR
. ~
REPORT I 7 I 8 I NUMBER 21 22
- .SEQUENTIAL OCCURRENCE*
REPORT REPORT NO.
CODE TYPE I I I o I 21 Tl 1.......-1 Io I 3 I lLl l=J 23 24 26 27 28 29 JO 31 ACTION FUTURE EFFECT SHUTDOWN
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ATTACHMENT NPRD-4 PRIME COMP.
TAKEN ACTION ON PLANT METHOD
.. HOURS ~ SUBMITTED FORM :;us.
. SUPPLIER l!.J@l!.J@ L!J@
~ I o Io I o Io 1.. L!J@
L!J@ Li@
33 34 35 36 37 40 41
. 42 43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS@
REVISION NO.
l.QJ 32 COMPONENT MANUFACTURER I BI 0 I 8 I 0 I@
44 47
!III] I Cause attributable to. apparent corrosion deposits in meter movement gear teeth.
Gears I ITIIl twere cleaned and switch was promptly reset to Dr.'esden setpoint. of 113+/-2. psifi
- I o::::ITJ jincreasing.
Other switches checked satisfactorily.* The (16) MSL Hi Flow !sol. Sw's
[J))] jwill continue to be tested monthly using DIS 250~1.
No* further corrective action
~
tdeemed necessary.
7 B
- 9.
FACILITY STATUS
% POWER rJ:ITl l.§J@ I o I 9 I 4 l@.._I --"'N"""'A......_ __
. OTHER STATUS @
80 METHOD OF
~
DISCOVERY DISCOV.ERY DESCRIPTION L!!J~~'----S~u~rv:..;..;e~i~l~l~an==c~e:....:.T~e~s~ti~n~g:.-____________ -'I 1
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10 12 n
44 ACTIVITY CONTENT.
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. RELEASED OF RELEASE AMOUNT OF.ACTIVITY ~
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. LOCATION O~ RELEASE @.
NA 80 PERSONNEL t:XPOSURES
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NUMBER
(.;':;\\TYPE
. DESCRIPTION ITI2J I o I o I o l0L!J@..__, ____ __..._...... N._A...__ ________________ __.
1 8
9 11 12 13 PEFISONNEL INJURIES
(,;":\\
NUMBER DESCRIPTION~
ITE] Io Io Io l@'-----------.......... ------------..,....------
1 8
9 11
- 12 BO LOSS OF OR DAMAGE TO FACILITY."4J'I.
TYPE DESCRIPTION o,;:::,J
[QI) !.Aj@)~-..,....--*-,_-------N=A..__ _______________ ___.
8 9
10
.80 80 PUBLICITY
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- ISSUEDt,;:;\\ D. ESCRIPTION ~
NRC USE ON l y j
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