05000237/LER-1979-032, Forwards LER 79-032/03L-0

Forwards LER 79-032/03L-0

ML17173A892
Person / Time
Site:	Dresden
Issue date:	05/30/1979
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A893	List: 05000237/LER-1979-032, Forwards LER 79-032/03L-0 05000237/LER-1979-032-03, /03L-0 on 790501:intermediate Range Monitors in Trip Sys Found Downscale During Rod Pulls to Heating Power, Resulting in Manual half-scram.Caused by Faulty Connector & Loose Input Connector
References
BBS-LTR-79-433, NUDOCS 7906050245
Download: ML17173A892 (3)

LER-1979-032, Forwards LER 79-032/03L-0

Event date:
Report date:
2371979032R00 - NRC Website

text

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Commonwe& Edison Dresden Nuclea;Wwer Station,.

R.R. #1 Morris, Illinois 60450

- Telephone 815/942-292(1 May 30, 1979 BBS LTR /179-433 James G. Keppler, Regional Director Directorate of Regulatory Operations U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Region III Reportable Occurrence Report #79-32/031-0, Docket #050-237 is hereby submitted* *to your office in _accordance wf°th Dresden Nuclear Power Station Techriical Specification 6.6.B.2.(b), condittons leading to operation in a degraded mode permitted by a limiting condition for operation or plant shutdown required by a limi~ing condition for oper?-

tion.

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B. B. Stephenson Station Superintendent Dresden Nuclear Power.Station BBS:lcg Enclosure cc:

Director of Inspection & Enforcement

• Director of Management Information &

File/NRG

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LICENSEE CODE 14 15 I o I - lo Io Io Io Io 1-lo Io 1014 LICENSE NUMBER 25 26 I i I 1 I 1.1 1 10l

• 1 10 LICENSE TYPE 30 57 CAT 58 CON'T

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[§TI] I IRM.' s 17 and 18 in the "A" trip system were found downscale during rod pulls to heat-I [QJJ] I ing power.

Since T.S.*Table 3.1.1 requires three operable instrument channels per J

[.QJJJ. I trip system, operator immediately initiated a manual.half-scram.

Event had minimal I

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safety significance since remaining two chann~ls in the iiAi' *.trip system were operable.

[QJTI I No effect on public health or safety.**

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SYSTEM CODE I II Al@

9 10 LER/RO CVENT YEAR REPORT I 7 I 9 I NUMBER 21 22 ACTION FUTURE TAKEr~

ACTION EFFECT ON PLANT

_:.* COMPONENT CODE.

CAUSE

CAUSE CODE SUBCODE.

COMP.

VALVE SUBCODE

. SUBCODE w ~@. I i NI s I T I R I u I@ ~@

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11 l=.I 23 SHUTDOWN METHOD 12 13 18' 19

20.

SEQUENTIAL OCCURRENCE REPORT REPORT NO.

CODE TYPE 10131 2 1 I/I 1°1 3 1

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ATTACHMENT NPRD*4 PRIME C.OMP *.

SUPPLIER*

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MANUFACTURER 80

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS@

• 43 44.

47 I IRM 17 failed because of a faulty connector' due to 'apparent minor damage during *re-

[IIJJ fueling.

Connector was replaced and tested satisfactorily.

IRM 18 had a loose input

• .CIIIJ preamp connector.

It was tightened and the downxcale. alarm cleared. - This was. the.1':S.\\::q [ITIJ.__f_i_* r_s_t_o_c_c_u_r,....e_n_c....,e_* o_f_

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using surveillance DIS 700-4.

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FACILIT'f

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% POWER OTHER STATUS ~ *DISCOVERY

. *.. DISCOVERY DESCRIPTION 32 ITTIJ UJ@ I 0 I 0 I 0 l@I NA I ~@

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• .*_>_***_:*I B ATIVITY cJ~TENT 12 l1

• 44 45 46 RELEASED OF RELEASE

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LOCATION OF R~~E;A,SE @ ;.<. ~...... '

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. 110 11 PERSONNEL EXPOSURES

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. *. :i'* *:* LOSS OF OR DAMAGE TO FACILITY 143'

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DEVIATION REPORT

_ Commonwealth Edison DVR t-10.

STA UNIT YEAR N~

D 2 -

79-5 PART 11 TITLE OF DEVIATION Unit 2 IRM 17 & 18 Downscale SYSTEM AFFECTED 700

PLANT CONDITIONS

Neutron Monitoring System StartuE MODE*

PWR (MWT)

DESCRIPTION OF EVENT

iRM's 17 & 18 both downscale during rod pull to heating power DESCRIPTION OF GAUSE

.Unknown at this time

' I'

• *-.:..~.'

OCCURRED 5-:1-79 2200

.DATE TIME TESTING 0

CJ.m

. : LOAD (MWE}

• YES NO EQUIPMENT DD YES FAILURE.

• CJNO DR NO.

. N/A WR NO.

3174 Randall Black

• • 5-1-79

~w;i..w.&J~_~R~ES-P~O~N~S~l~BL-E~SU_P_f-RV-l~S~O-R~~~--

DATE PART 2 I OPERATING ENGINEERS COMMENTS All control rods inserted and mode switch moved to refuel position.

Manual half scram initiated immediately on Channel B.

SAFETY-TYPE OF DEVIATION EVENT OF POTENT I AL TECH SPEC "NON-REPORTABLE ANNUAL

. RELATED REPORTABLE OCCURRENCE PUBLIC INTEREST VIOLATION

,OCCURRENCE REPORT I NG : - WR ISSUED D

D 10CFR21 14 DAY D

~

30 DAY NOTIFICATION 6.6.B.2.b

~..

REPORTABLE CCCURRENCE ACTION ITEM NQ.

NUMBER *

• N/A

~- 79-32-03L--0 24-HOUR NRC NOTIFICATION DTPH NLA REGION I I I DATE TIME DTGM NLA REGION 11 I Be DOL CATE TIME RESPONSIBLE* COMPANY OFFICER INFORMED OF 10CFR21 ND ONS AND THEIR REPORT TO C

. *. REVl EW AND COMPLETED YES CB YES 5J D

,D NO D NO D PROMPT ON-SITE NOTIFICATION A. Roberts - Asst. Supt.

- S/15/79 1600 TITLE DATE TIME N/A TITLE DA.TE

• TIME PROMPT OFF-SITE NOTIFICATION F..A. Palmer 5/16/79

. 10: 30 TITLE DATE-TLME -

J. R. Gilliom

... 5/16/79 10:30 TITLE DATE TIME.

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