ML17174A111

LER 79-053/03L-0:on 791003,trip of Fuel Pool Area Radiation Monitor Resulted in Autostart of Standby Gas Treatment Sys & Isolation of Rx Bldg Vent Sys.Caused by Diaphram Drift to Setpoint Shift

ML17174A111
Person / Time
Site:	Dresden
Issue date:	11/01/1979
From:	Badran S COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17174A112	List: ML17174A111 ML19250C020
References
LER-79-053-03L-01, LER-79-53-3L-1, NUDOCS 7911060423
Download: ML17174A111 (2)

Text

Common.th Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 ,Y*"

Telephone 815/942-2920 October 31, 1979 BBS LTR #79-873 James G. Keppler, Regional Director Directorate of Regulatory Operations.- Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report ft79-53-03L-0, Docket #050-237 is hereby submitted to your office in accordance with Dresden Nuclear Power. Station Technical Specification 6.6.B.2.(b), conditions leading to operation in a degraded mode permitted by a limiting condition for operation or plant shutdown required by a limiting condition for operation.

.tep nson Station Superintendent Dresden Nuclear Power Station BBS:lcg Enclosure cc: Director of Inspec.tion & Enforcement Director of Management Information & Program Control File/NRC

e LICENSEE EVENT REPORT.* e

, . I I .....6\..Y

,___._~....___..~_._____..___

If,\ (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

E I r I LI n IR Is I 2 8 9 LICENS.EE CODE 14 10)1 15 o lo I- lo lo lo

__ . LICENSg.NUMBER 1.-<Y~lo I- lo 10 101411 11111 1 25 26 LICENSE TYPE l©I JO I I© 57 CAT 58

.JN'T J:2J ~~:~~~ L!:J©I o I s I 0 I 0 Io- 1 2~1 3 17 101 1 1° 1° 1 3

17 19- IG)l 11 1

I 0 '1 1 I 7 19 10 8 60 61 DOCKET NUMBER 68 69 i:VENT CATE *74 75 REPORT DATE BO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@ . * * .

CID I During normal operation, a spurious trip of U-3 "A" fuel pool ARM resulted. in ciuto CIIJ I .start of "Au SBGTS and isolation of RX Bldg. vent system.* "A" train ran for approx.

18 sec and tripped. '*'B train auto started in standby. Sub sequent

• 1Y, "A" t rain

• was ITTI manually started and ran properly with a flow of approx. 3800 CFM. Since secondary QI]

containment integrity was maintained, safety significance of this event was minimal.*

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~ ~l~T_h~i_s~e_v_e_n_t~i_s~n_o_t~r_e_p~e_t_i_t_i_v_e_._*~~~----"~~~~~~~~~~~~~~~~~~~~~~~~___.I SYSTEM CAUSE CAUSE COMP. VALVE CODE . CODE SUBCODE COMPONENT CODE *suBCOOE SUBCOOE Is le I@ LI@ w@

9 10 rl NI sl rl RI ul@ ~@ ~@

11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION

~ LEA/RO c-vENT YEAR REPORT NO. CODE TYPE 11;0.

\;.!.) REPORT

• . NUMBER I7 I9 I 21 22 I

23 I I 01 s1 31 24 . 26 1/1 27 I oI 3 I 28 29 L!:J l=J L2.J JO 31 .32 ACTION FUTURE EFFECT SHUTDOWN . c::;.. ATTACHMENT NPRD-4 PRIME COMP. COMPONENT

• TAKEN ACTION ON ?LANT METHOD HOURS SUBMITTED FORM SUB. SUPPLIER MANUFACTURER UJ@W@ W@ W I 01 01 01 01 ~@ L!J@ L!!J@ IM 12 I 3 1s '

33 34 35 36 37 40 41 . 42 43 44 . 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS .

I 'Low flow switch (2/3-7541:...4SB) had a high flow setting and caused the "A SBGTS train to trip. Set point shift was due to diaphram drift. Flow switch was recalibrated to normal setting and *proper operation of system was verified.*. A yearly surveillance ill] I will be initiated to ensure proper setting of low flow switches.

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8 9 80 FACILITY f:iQ\ METHOD OF ~

STATUS  % POWER OTHE:=! STATUS \:::::) DISCOVERY DISCOVERY DESCRIPTION ~

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I) 9 10 12 11 44 45 46 80 ACTIVITY CONTENT ~

RELEASED OF RELEASE

• AMOUNT OF ACTIVITY~ LOCATION OF RELEASE @

QI) 8 liJ @ W@._I---'--N"""'"/A'"---_ _ _ ___.

9 10 11 44 45 N/A 80 PERSONNEL EXPOSURES r::;;::;,.

NUMBER r::;,. TYPE DESCRIPTION

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8 9 11 12 ' 13 80 PERSONNEL INJURIES (.;\

- NUMBER DESCRIPTION~

iliJ8 I 0 I 0 I 0 I@

9 11 1:.!

N/A 80 LOSS OF OR DAMAGE TO FACILITY t4:J'I TYPE DESCRIPTION '.:.:::,;

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8 g

. N/A

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PUBLICITY ~ B 0

ISSUEDQ DESCRIPTION~ NRC USE ONLY "'

IT£J LtLlei 8 9

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