05000237/LER-1979-003, Forwards LER 79-003/03L-0

Forwards LER 79-003/03L-0

ML17173A572
Person / Time
Site:	Dresden
Issue date:	01/31/1979
From:	Stephenson B COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A574	List: 05000237/LER-1979-003, Forwards LER 79-003/03L-0 05000237/LER-1979-003-03, /03L-0 on 790105:PS 2-1430-1466D Tripped at 105 Psi.Caused by Instrument Drift
References
79-99, NUDOCS 7902060241
Download: ML17173A572 (2)

LER-1979-003, Forwards LER 79-003/03L-0

Event date:
Report date:
2371979003R00 - NRC Website

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Comrr10nwA Edison Dresden Nuclear Power Station R.R. #1

, Morris, Illinois 60450 Telephone 815/942-2920

• BBS LTR ff 79-99 James G. Keppler, Regional Director January 31, 1979 Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Corrnnission 799 Roosevelt Road Glen ~llyn, IL 60137 Reportable Occurrence Report ll79-03/03L-0, Docket II 050-237 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 fulfillment of the functional requirements of affected systems.

BBS:lcg Enclosure cc:

Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC

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LICENSEE EVENT REPOP.T U.S. NUCLEAR REGULATORY COM1vllSSIOi~

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CONTROi= BLOCK;._I _...____..

_ _.__._l*_..._l-'---'18 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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1111 I DIR/ s1 21010 10~1-IOJO 10 10 10 I-jo 10 10)14 Ji 11 11 11 IG)I I 1@----

LICENSEE CODE 14 15 LICENSE NUMBER 2.5 26 LICENSE TYPE

JO 57 CAT 58 CON'T

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GO 61 DOCKETNUM8ER 68 69 EVENTDA~E

• • ~.'?;.~~~75 REPORTDATE.

80 EVENT DESCRIPTIO_~_'.AN.9-,~B*lE CONSEQUENCE~@..

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!While perforning Surv. DIS 1400-3, PS 2-1430.,.1466D tri"pp"ea at l05PSI incr.

Two [2J}] I subsequent loadings revealed trips at lOlPSI.

• T.S. 4.5.A and Table 3.2.2 requires [IIO_ 1trip at 50 </= pr</= 100 psig.

Dresden setpt. is 95+/- 5 psig.

Safety significance

~

!minimal, three. redundant core spray.pp. discharge press sw. 's were operable and would [QJTI I have provided necessary permissive at 95.8 psig. *Similar occur;rence ref. in R.O. ff

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78-031/031-0.

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SYSTE~.i C.ODE is IF I@

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LERIRO c-VENT YEAR 0

REPORT I 7 I 9 I NUMBER.

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C..:>.USE C.>.USE CODE SUSCOOE.

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COMPONENT CODE.,

I r I N I s I T I R l~-u I@

11 12 13 18 SEQUENTIAL OCCURRENCE°*

flE?ORT NO.

CODE I o I o I 3 I I /I I o I 3 I 23 24 26 2 7 28 29 CO,'.~P. '*..

VALVE SUBCODE SUBCODE L!J@ LLJ@

19 20

. REPORT TYPE L!J 30 31

. ACTION FUTURE EFFECT SHL.'TDCi'fN Q

ATTACHMENT NPRD-4 PRIME COMP.

SUPPLIER REVISION NO. w

32.

• COMPONE~H

. MANUFACTURER 80 TAKEN ACTION Oi*J ?LANT METHOD HOURS ~ SUBMITTED FORM :>UB.

~@~@ ~@ ~ 101010101

~@ LI 33 34 35 36 37 40 41 42 L!U@

I s I 3 I 8 I 2 I~

CAUSE DESCRIPTIOi\\J A~D CORi=lECTIVE ACTIONS@

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• 44

. 47

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fa use attributable to_ ~ns trumen t drift. _s_w_i_t_c_h_w_a_s_i_rrrrn_e_d_i_a_t_e_l....:y_r_e_s_e_t_t_o_9_4_. 2_p~s_i-"g,__ _ __,

ITIIJ jincr. and tested for repeatability.

The Core Spray Purrip Auto Blowdown Permissive [IJj] !Pressure Switches will continue to be tested monthly per DIS 1400-3.

Switch is mfd. byJ [JJ]J IStatic-Q.,.Ring model ff5N-AA3.

rr::m 0.9 80 METHOD OF

~32 DISCOVERY OiSCOVERY DESCRIPTION 1..:::.::J l.~J@LI __

s_u_rv_e_i_l_l_an_c_e_T_e_s_t..;...i_n.:::g ________ ___,/

44 45 46

80.

.LOCATION OF RELEASE@

NA 45 80 NA

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