ML17252A276
| ML17252A276 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 03/22/1977 |
| From: | Stephenson B Commonwealth Edison Co |
| To: | James Keppler NRC/RGN-III |
| References | |
| 50-249/1977-5 BBS Ltr. #177-236 | |
| Download: ML17252A276 (2) | |
Text
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Co~~monwea9Edison D~sden Nuclear Power Station R~R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS Ltr. /177-236 March 22, cl-977
'REGULATORY DOCKET FILE C0PI r--
- ~
Mr. James G.
Kepp~~~' Regional Director
~
Directorate of Regulatory Operations-Region III U. S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137
(
. Enclosed please find Reportable bccurrence report number 50-249/1977-5.
This report *is being submitted to your office in accordance with the Dresden Nuclear Power Station Jechnical Specifications, Secti 6.6.B.
BBS :jo cc:
Director of Inspection & Enforcement Director of Management Information & Program.Control File/NRC
.( **'
MAR 2 5 1977
LICENSEE EVENT REPORT
- -f...
\\
CONTROL' BLOCK:'!
I
- 1 I I
(.SEiPRINT ALL REQUIRED INFORMATIONj
,.1 1
6 LICENSEE NAME.
LICENSE NUMBER
'/@12]. I r I LI nl aj
-~ aj i I o I o I""'."" I al al 01 01 o 1-1 o I o I 7
89
~~-~1_5 25 CATEGORY REPORT*. REPORT TYPE.
SOURCE DOCKET NUMBER LICENSE TYPE 14111111111 26 30 EVENT DATE EVENT TYPE t 01. 31 31*
32 REPORT DATE
@TI]coNT I I I L1J. lJJ
- 7. 8 57 58 I ol 51 ol~I ol 21 41 91 1012121011111 I o I 3 I 21 21 11 11 59 60 61 68 69 74 75 80 EVENT DESCRIPTION ldl2f I. During routine.start-up operation checks, APRM' s 113 and 116 were found with rod 7
8 9 lol31 I block trip points of 12.5% and 13.2%, respectively (Tech Spec limit: less than 1* **0 9 lol4.l. I or equal to 12% of rated power).
7. 8 9 Safety implications of this event wer.e minimal,
@Ifil* I since* the remaining four APRM channels. in the trip system would have provided.
7 8' 9.
IQ:ffi]' I tFedundant. reactor protection.
7*
8* 9*
This is not a repetit.ive occurrence.
(50".'249/ 1977-5)
SYSTEM CAUSE COOE CODE COMPONENT CODE
@E]JrlAI W 7
8 9 10 11 12 rl N* I s I TI RI u I 17 CAUSE DESCRIPTION PRIME COMPONENT SUPPLIER
~
43 COMPONENT MANUFACTURER GI o1s101,.:.
44 47~
VDLATIJN LU 48 lol0I I The event was attributed to electronic drift.
The trip reference cards for both 7
8 9
- lolsl I, APR.M's 113 and f/6_ were adjusted to provide the. correct trip point prior to power 7
8 9 IT@ I operation.
7 B 9 The APRM rod block trip points will continue to be checked periodically lillJ*
7.. B FACILITY STATUS L-9 9
FORM OF
.,ACTIVITY
- RELEASED LzJ 9
PERSONNEL
% POWER OTHER STATUS I
- I 0 I 0 I 0 I..... I __
NA_* ______ __,
12 13' 10 44 CONTENT OF RELEASE AMOUNT OF ACTIVITY *.
lzJ l ___
N
....... A..___ ___
- 10.
11 EXPOSURES 44 METHOD OF (Continued)
DISCOVERY DISCOVERY DESCRIPTION L!J I.
45 46 I
LOCATION. OF RELEASE..
NA 45 I
80 I
80 I
80 I
80 I
80 BO
.
- l 80 I
BO 80 80
.NUMBER
'TYPE
. DESCRIPTION
- j1]3l l oJ ol d liJ ~----NA~-----------------------------___,
. 7. 8 9
.11 12
. 13 BO PERS'ONNEL INJURIES NUMBER DESCRIPTION EEJ I al al o I.'::---..u"6......;._ ______________
......,J 7
B 9.
11 12 BO OFFSITE CONSEQUENCES Erfil.
NA 7
B 9 80 LOSS OR DAMAGE 1TO FACILITY TYPE DESCRIPTION Efil L~J NA
- 7. B 9 10 BO PUBLICITY
- . =Ailll- *
- NA.
7 B 9 BO ADDITIONAL FACTORS
~ I CAUSE DESCRIPTION (C'ontinued) to ensure timely identification of any re-7 B 9 BO.
.Elfil I curring problem,
. 7 8 9 The trip reference cards are Gener.al Elect~ic type GE 136Bl319G~-
80
- . components.
NAME:_,_.._...,.!_
D~e...:s~l.;!,,,....iS~a=..!n~t=.:a=..!n~n~a::.._ ____ __; ______ PHONE: ___ E_x_t_. _4_2_1_._
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