05000237/LER-1979-027, Forwards LER 79-027/03L-0

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Forwards LER 79-027/03L-0
ML17173A894
Person / Time
Site: Dresden Constellation icon.png
Issue date: 05/30/1979
From: Stephenson B
COMMONWEALTH EDISON CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A895 List:
References
BBS-LTR-79-428, NUDOCS 7906050268
Download: ML17173A894 (5)
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LER-1979-027, Forwards LER 79-027/03L-0
Event date:
Report date:
2371979027R00 - NRC Website
v • d • e

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Commonweillllla Edison Dresden Nuclea.Wwer Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920. --~-____,_ __

May 30, 1979 BBS LTR #79-428 James G. Keppler,. Regional Director Directorate of Regulatory Op~rations - Region III U.S. Nuclear Regulatory COIDillission 799 Roosevelt Road Glen Ellyn, IL 60137 Reportable Occurrence Report f/79-27/03L-0, Docket #050.,...237 is hereby submitted to your office in accordance with Dresden Nuclear Power Technical Specification 6.6.B.2.(b), conditions ieading to operation in a degraded mode permitted by a limiting condition for operation or plant shutdown required by a limiting condition for operation.

nson Station* Superi~tendent**.

Dresden Nuclear.Power Station BBS:lcg_

Enclosure cc:

Director o,f Inspection & '**Enforcement Director of Man~gement Information & PrograIIl Control FileiNRC

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L REauoREo o~FORMATIONI

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9 LICENSEE CODE 14 15

. _t;ICENSE.NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 1 CON'T 1 0I]

~~~~~~ W© I o I s I o I o I o I 2 I 3 I z 101 o I s I o I 2 I z I 9 I© I o I s I 3 I o I z I 9 10 j, 7"

. 8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT OATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES @

had I t ** [§]2]. I During startup main turbine trip~ed on high water. level.

"B" yarway reference leg f

drained because of a leak<<)rt **lo:cal pressure indicatio~ isolation val;e.. High Rx rorJ1 LI~~~~~~~~~~~~~~;__~_;_;.~~~~~~~~~~--:-~-=~~:---~

1*;;. pressure switches PS-263-SSC and D were isolated to is~late. leak.*. Since T. S. Table.

lnTi:l,.. 3.1.1 requires 2.. :instrument. channels p~r.. trip system,*. an orderly ~ shutdown was. be-.

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Minimal safety significance. since both trip systems were still oper-1

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ATTACHMENT NPRD-4*

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C.OMPONENT.

MANUFACTURER 80 TAKEN ACTION ON PLANT METHOD HOURS SUBMITTED FORM SUB.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

44 47 [I)):] I A packing leak wa,s found.on the isolation valve for-PS-263-60B.

The l~ak.. was :i.solatedl

. which also isolated 263-ssc* and 55D (high reactor press.ure), and yarway hfgh side. for 263-59B, 58A; 58B~ 72B, and 72D.

The packing was adjusted, tested, and the system

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line up was r_eturned_ to normal:* *All instrUrnents returned to the pr_. op~r. range a$ ~he 1*

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. j.* fill?,!c, ::: er enc e leg filled..

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. STATUS

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DISCOVERY.

DISCOVERY DESCRIPTION @ *

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ATTACHMENT TO LICENSEE EVENr REPORT 79-027/031-0 COMMONWEALTH EDISON COMPANY (CWE)

DRESDEN UNIT (ILDRS2)

DOCKET # 050-237 During startup on Unit *2.at 1918 on May 2, 1979, the main turbine tripped on high water level. It was discovered that a packing leak existed on the isolation valve for the local pressure indi~atiori, PS-263-60B.

The "B" reference leg drained to an abnormally low level through*

the packing leak.

This resulted in an: upscale reading on all the yarways on instrument rack 2206.

The "B" reference leg _root valve was shut to isolate the leak which isolated the following components:. PS-263-SSC, SSD, LIS-263-58A, 58B, 72B, 72D, and LITS-263-59B.

A control systems.

technician locally isolated PI-263-60B (local pressure indica.tion) and PS-263-SSD (reactor.high pressure scram) via their comm9n,.. SeQSing line

  • root valve.

The "B" reference leg root valve was then opened and the reference leg filled.

Since. Tech. *Spec *. Table 3.1. _l requires two in-**.,,;*

strument channels per trip system, an orderly. reactor shutdqwn was begun immediately.

The packing was tightened-and subjected to a hydro of 1000 psi.

No leaks were discovered.

The isolation valves. for PS-263-SSD and PI-263-60B were opened and the common sensing line root valve was opened, returning the system to normal.

This. event was* of minimal safety significance, since one -instrument channel per trip system was still capable of performing its intended function as. designed.

This was the first.occurrence of this type on Unit. 2.

There was no* ~ffect on public health or safety.

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e DEVIATION REPORT DVR NO.

Commonwealth Edison

,ST.~L* l.!NIT YEAR NO.

D 2 48 PART 1( TITLE OF DEVIATION OCCURRED 5-2-29

] 9J8 "B II Yarway level instrumentation r.eading upscale

.DATE TIME SYSTEM AFFECTED 263 PLANT CQNDITIONS TESTING Reactor Yessel. P~e$sure*~-

C. Rx pr. @)

D OCJ Startu*p TnC: t-*,.-:11mi>nt-c::--

MODE PWR(MWT) '585 psi

. LOAD(MWE) 0 YES NO

DESCRIPTION OF EVENT

At 1918 hrs cm 5-2-79 the main turbine tripped on high water level. It was discovered that a packing leak on the local pressure indicator 263-60B isolation valve had caused the. 'B' yarway reference leg to drain.

This caused yarway level instruments 263-59B, 263-58B, 263-72B, {ov.er)1;(!

DESCRIPTION OF GAUSE Packing leak on isolation valve to Pl-2_63-60B OTHER APPLICABLE INFORMATION When leak was isolated, level indication came back on scale as the condensing chamber began.

filling the reference leg.

EQUIPMENT IB:::J YES DR NO.

FAILURE ONO N/A WR NO.

3218 PART 2 I OPERATING ENGINEERS COMMENTS W. Pietryga 5-2-79 RESPONSIBLE SUP~RVISOR DATE Initiated insertion of Control Rods and completed insertion of all control rods within four hours.

Redundant ECCS and Rx scram instrumentation would have functioned* a.'s designed.

,

  • SAFETY-TYPE OF DEVIATION EVENT OF POTENTIAL TECH SPEC

'NON-REPORTABLE ANNUAL RELATED REPORTABLE OCCURRENCE PUBLIC INTEREST VIOLATION*

OCCURRENCE REPORT I NG*

WR ISSUED D

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(il 14 DAY 10CFR21 YES YES D

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6.6.B.2.b REPORTABLE CCCURHENCE ACTION ITEM NQ.

NUMBER

~. 7-9-27-..03L-0 N/A 24-HOUR NRC NOTIFICATION (Courtesy)

~TPH J. Barker.

  • 5/3(79 REGION I I I DATE TIME
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REGION I I I & DOL CATE TIM_E RESPONSIBLE COMPANY OFFICER INFORMED OF 10CFR21 ND ONS AND THEIR REPORT TO C

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REVIEW AND ACCEPTANCE BY iTATLON REVIE~*

AS REQUIRED DATE PROMPT ON-SITE NOTIFICATION

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B. B.

Stephenson 5/11/79 TITLE DATE*

TIME.

N/A

- TITLE DATE TIME PROMPT OFF-SITE NOTIFICATION F. Palmer 5/11/79 12:20 Tl TLE J. R. Gilliom 5f1Yh9

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.DATE TIME.

TIME

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DESCRIPTION OF EVENT

and *263-58A to fail high.

The leak was isolated which also isolated pressure switch 263-SSD (Rx High Pressure Scram~ ~eactor shutdown commenced at 2103 as required by Technical Specifications.

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