ML17174A495

Forwards LER 80-008/03L-0

ML17174A495
Person / Time
Site:	Dresden
Issue date:	03/25/1980
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17174A496	List: ML17174A495 ML19322E867
References
80-242, NUDOCS 8004020363
Download: ML17174A495 (3)

Text

• B . cdmmonwealedison e Dresden Nuclear Power Station A.fl. #1 Morris, Illinois 60450 Telephone 815/942-2920

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, __ March 25, 1980 BBS LTR #80-242.:

James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Connnission 799 Roosevelt Road Glen_ Ellyn, IL 60137 Reportable Occurrence Report #80-8/03L-O, Docket #050-249, is being 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 tech-.

nical specifications but which do not prevent the fulfillment of the functional requirements of affect:ed systems.

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

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icav~z~3~s

~MR 3 1 1980

RC FORM 366: --* ...... --* U/S.NUCLEAR REGULATORY COMMISSION* *

>.77) .. ~ "' * .

---~\~ * . eeNSEE EVENT REPORT

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car-i:rROL BLOCK:

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1 1 1 10*

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)*

O:IJ I I I LI 8* 9 DIR L.ICENSEE CODE I s ,. 3 IG)I

. 14. 15 0 I ol'--1 0 I 0 lo* lo* I 0 L.ICENSE NUMBER

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• lo ro IG')f 4 I ii 25 26*

1 I L.ICENSE TYPE 1 r l l©I*

JO 57 CAT SB 1* I©

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~~~~~ W©I. o I 5 I o I o Io 60 61 DOCKET NUMBER 1*2 I 4 I9

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101 o 13 Io I1 I a .Io 58.. 69 . EVENT DATE

.l©I 74 75 o I 3 J 2 I s I a 1* o IG)

REPORT DATE 80

-=ev'ENT 0EscR1P~10N A~.D PROBABLE coNSEQUENces@. . *. * . . .

f[ITI. I During Unit 3. refueling outage, while* performing temperature switch calibration I

~: I surveillance,. nrs* 2300""'. T,. three temperature* switches failed to. trip <l=, 200 degree F. 1.

as per tech ... spec *. table 3*.2*.i. Safetrimplications were minimal. since at least two I' remaining switches in. channels B and" D were operable as. were: redundant channels A and I.

w* I C, and would have :auto isolated the HPCI system at 180 degree F. Similar* events: R.O

• f m I 50.,-237/74...;.63 and 50-249/80-11, I-3-73-4 .and* I-3-74-6. r lill 8-9 80 SYSTEM<< CAUSE CAUSE' COMP: VAL.VE CODE*

nu*

CODE suscoDE COMPONENT CODE'. suBCODE. SUBCODE IS IF I@ L!J@ l!J@ I I 9 10 12 13 I NI s I T'I R: I u 1@ ~@) Ul@

20 8 11 18 19 SEQUENTIAL. OCCURRENCE REPORT REVISION*

~- L.ER/RO CEVENT YEAR REPORT NO. CODE. TYPE NO.

• .

~ REPORT NUMBER I s1 01 l=J. 10 10 18 T 1/r Io 13 I ~ l=1 L~.l 21 22 23 24 26. 27. 28. 29 30 31 32 ACTION FUTURE EFFECT SHUTDOWN ~ ATTACHMENT NPR~**

• PRIME COMP. COMPONENT TAKEN* ACTION ON Pl.ANT. METHOD HOURS ~. SUBMITTED FORM SUB. SUPPLIER MANUFACTURER L.:J@L.:.J@

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36 37 40 41 42 L!!J@. IF Io is 111@

43 44. 4T CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

IIIJ. 1 The cause of failures were drift, excessive gap between actuator and switch plunger,

rm* I or dirty contacts. ** The necessary adjustments were made to the switches, and they were

!IIJ. I recalibrated to 180 degrees F +/-5 degrees. All HPCI area temperature switches shall I

ITIJ I continue to be tested during each refueling outage.

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8 9 ~

FACILITY STATUS  % POWER . OTHER STATUS.

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\:::;:J METHOD OF*

DISCOVERY .

• DISCOVERY DESCRIPTION

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8 9. 10 12. 11 ACTIVITY CONTENT * @* 44 45 46 80 7"T:1REL.EASED O.F REL.EASE AMOUNT OF ACTIVITY 35 l.OCATION OF REL.E.ASE @

~* Ll.l@ L.Ll@I . N/A . 1_:, N/A 8 9 10 11 44 45 80 PEASONN EL EXPOSURES* *r::;:;:.,

~TYPE .

m.1 OI OIOl~~~-N/_A_-----------~--------------~

NUMBER DESCRIPTION 8 9 11 12* 13 80*

PERSONNEL. INJURIES * ~

NUMBER DESCRIPT10N6

!TI]. I 01 01 Ol@)L------N~/A-------------------------------------~

8 9* 11 . 12 80 LOSS OF OR DAMAGE TO FACI L.ITY f'43\

71n'1 TYPE. DESCRIPTION \;.::J

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• N/A 8 9 10 . 80 PUBLICITY G\ NRC USE ONLY 1sr* '".".lt,;"'.;'\ DESCRIPTION~ "'

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ATTACHMENT. TO LICENSEE* EVENT REPORT* 80-008/03L-0 COMMONWEALTH EDISON COMPANY (CWE)

. ----------

---~~-*-* DRESDEN UNIT (ILDRS.,-3)

., DOCKET' II 050;249 HPCL area. high* temperature: switch Ts*: 3-2J71B tripped repeatedly at: 204.3°F' iI1creasing.. The failure* can. be* attributed to instrument:

drift:. *

. HPCI area. high* temperature switch TS3-2370D*tripped repeatedly at 273.6°F increasing. The failure can.be. attributed to excessive gap between the actuata.r and switch plunger-. *The switch was found to _have a. gap of' approximately 0.120 in., as compared to a proper*

gap setting of. approximately . 060 in-.. The .gap was adjusted* to . 060 in.

HPCI area high temperature.switch TS 3~2370B.tripped repeatedly at 235°'7°F increasing*.

• The failure* was attributed. to loose mounting bolts on the. micro-:-swit_ch and dirty switch contacts. Bolts* were tightened. and switch contact_s Clea1!_ed.

All switches were recalibrated to a setting of 180°F + 5° *in com-*

pliance with Tech. Spec. :'able 3. 2.1.. All. HPGT area temperature switches* shall continue* to be tested. during each refueling outage.