ML20138N971

Responds to NRC Re Violations Noted in Insp Repts 50-282/85-14 & 50-306/85-11.Corrective Actions:Program Underway to Upgrade Alarm Response Procedures

ML20138N971
Person / Time
Site:	Prairie Island
Issue date:	09/30/1985
From:	Larson C NORTHERN STATES POWER CO.
To:	Norelius C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20138N948	List: IR 05000282/1985014 ML20138N971 ML20138P000
References
NUDOCS 8512240232
Download: ML20138N971 (6)

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Northem States Power" Company 414 Nicoilst Mall Minneapobs, Minnesota 55401 Telephone (612) 330-5500 September 30, 1985 i

C*E N@orelius, Director

. J 1)ivisi'on'of Reactor Projects US Nu'elear Regulatory Commission Region,lII

-799 Roosevelt Road Glen Ellyn, IL '60137 3

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PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 J

s This-letter is in response to your letter of August 30, 1985, which trans-mitted Inspection' Reports No.- 50-282/85014(DRP) and 50-306/85011(DRP).

' Responses are provided to the violation and to each item of safety concern.

V[plation t

Technical Specification 6.5. A.3 requires, ira part, that detailed written procedures shall be prepared and followed covering actions to be taken to corrset' specific and foreseen potential or actual malfunction of systems or components including responses to alarms'.

4 Contrahy;to the above, a complete' alarm response procedure for annunciator location 47501-501 was' not ava'ilable in the control room from August 23, 198 to June 24, 1985.

1 This is a Severity Level V violation (Supplement 1)'.

Response

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The' alarm response _ procedure in question pertains to the new intake screen-house. When the

lnew screenhouse was turned over to the operations depart-mentiin early 1SE4, temporary operating instructions were issued. The alarm response procedure.was part of Temporary Memo (TM) 84-10.

The

" permanent" alarm response procedure,C47.26 issued in June 1984 made

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reference to1TM 84-10.

On August 23', 1984 the temporary operating instruc-tions were reissued as TM 84-42 and:TM 84-10 was cancelled; however, the s.

G5.12240232 851220

'P PDR ADOCK 05000282 OCT 2 1985 O

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'C47.26 procedure"still;ref<rrenced TML84-10. 'On January 25, 1985, the" J

itemporary operating instioctionsiwere:again reissued, this time as TM M 04'. :TM 84-42.was"came'elled, but the':old reference to T f. 84-10 V

' remained!in C47.26. Ir:now appeared ~that no procedure was available,-since

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TN 84-10 had been chn A lv, when in~

fact.the procedure.waa in'effect under g

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• InDJune31985'.the C47.26 procedure..was. corrected to provide a. proper Treference. Fulli compliance has been. achieved. There.is a program now i-Q

under wayjto upgrade theTalarm response

procedures.

- G Items' offs'afety Concern h i

' 7kThe[five concerns list'ed below'all relate.to modifications:to'the facility.

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- Specific corrective actions'are listed for'each concern noted.

. orrective C

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section forithe.. broader area of modifications includes.the following manage-fJ

i. ment. actions:

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21) : More) detailed review-offmodification work packages by members of J e

(p1 ant-staff knowledgeable in integrated plant operations and

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tengineering criteria.-

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-:Use i f the "tieam" con, cept intthe modification process to: identify-P

' ; interfaces'and interferences early.

~ ' 3)" [Strengtheriing) the' ties-be' tween. the' plant-and construction QC

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organizations to ensure timely resolution'of problems..

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J' L4)) :S'trengthening'NSP supervision 4 of'construetion crafts to ensure

,thatLcraft supervision-is= aware'of the special' concerns required i

'~n for~ work in an operating facility.

II't-is:believedithat.these actions: support:the. specific corrective' actions-111sted below and; address'the broader concern of physical / control of plant

" modification.1

-: a. ; 1 Concern' y

' NSP[ Corporate QA Audit.No.; AG 85--16-Outage resulted in a Finding (No.

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FG-85-5)'that'CommonwealthiElectric'Co., a' contractor.to NSP at (Prairie Island,thad conducted! work activities which were ineffective f

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,3 Corporate'Administrativa Work Instruction N1AWI15.1.15, Revision _0.'

'iThis; instruction specifies'in Sections 6.5.2'and 6.5.3, among other-Ethings',' that;an Engineering 1 Change RequestL(ECR) is_to be'. released"for

< r bisplementation.only;after-resolution of!the ECR. Specifically, the y

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J Corporate:' QA Auditor' foundh that conduit support hangers and.other electrical components were installed without prior' engineering approval fand not;in accordance with existing design documents.

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-September' 30, 1985

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y.g, g-In-plant corrective actions have included review of the existing.

' installations of conduit support hangers. To date, two safety related b:

electrical cable supports have been found which willcrequire special 4

seismic analysis. This analysis is-to be completed by August 30,

'1985.

Corrective actions by the construction forces have. included management

. review of the. Finding, review and updating.of construction standards, personnel additions'to the NSP Nuclear Engineering and Construction

, ~ field staff, and personnel changes in Commonwealth Electric Company.

Response

Corrective actions outlined-in the above concern.have been effective in 1res'olving this= problem. The'special seismic analysis'of eight supports for p

two' safety-related conduits has been completed. Capability to do such analyses in-house is also being. developed.

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Concern-NSP Corporate:QA Audit No. AG 85-17-Outage resulted in Findings that the Prairie Island plant. staff, the Nuclear' Technical Services staff, s

-.and the Nuclear Engineering and; Construction' staff'all failed to properly implement the NSP uniform modification processes described in Corporate,N.uclear Administrative Work Instruction NIAWI 5.0, Modifica-tion and-Maintenance,. Revision'1, which contains an overall description

.and general instructions for the use:of the process.- The Corporate QA 1 Auditor found.in his report for-the period January 14 - March 18, 1985 that the Prairie Island plant staff, the Nuclear.. Technical Services Lstaff,'and the Nuclear: Engineering and Construction staff all failed to properly i.mplement the uniform modification process. 'These failures

were:in the areas'of planning'and coordination.. design, logging / tracking,

. document control, project control, and turnover.

Corrective actions _ implemented by the licensee have included retraining

'.of the users of the modification process.

In addition, further audits

.of the use of the process are.to be conducted by Corporate QA during-the' Unit-2'10-year outage scheduled to begin in September.1985. The resident inspector.will review the results of these audits.

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Respo'nse

A follow-up audit was ' completed just before the refueling. outage.

Conclusions of that' audit were.that:

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Training was conducted as required for correction of the previous audit findings.

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2.. ;There was general l improvement in modification processing.

(Another follow-up audit is being conducted-during the present outage, m

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i:A(f. 'T,.{C(E N5rslius,jDir:ctsr;

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(Page[44 Northom States Power Company 1

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During th'e conductiof and in thei. location.of Appendix R~ work in the.

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• Auxiliary,BuildingLon May;8, 1985, the two-inch. instrument: air supply 1

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J11ne'for; Unit;11 failed.;L0ne' result of.this~ failure was a trip ~of Unit

21. 1(SeesInspectioniReport 50-282/85010(DRP);T50-306/85008(DRP)).

. 9Possible;causesiof;the breaktincludeiaccidental bumping of the line 4

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Hand;relocationfof/the.linelto accommodatefAppendix R work.

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Corrective' actions

have! include'd. inspection'ofthe[line.andreinforce-

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ment? of leaking - soldert joints.1 The licensee's; final' Investigative.

u Report will.be reviewed by_the'Re'sident: inspector.

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%Responsei IThisfeventwasL; reported'as. Unit'IfLER'85-009.

J LonMay 8,~ !1985',{Un'itil(wasla't 100% ' power [ At about 1323, a 2-inch' copper'

- { instrument ' air?lineTseparatedat a soldered" elbow joint. As.a result, the-FUnitTliside:of the instrument.airLsystem depressurized enough to causeithe f

7 eedwater regulating valve to No. 12 steam' generator to close..At 1326,

~ Unit 011trippedfonLlow steam generator level plus feedwater flow / steam flow

,y,Ymismatch.

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l Cable tray; wrapping for Appendi:ic Ricompliance' was;in progress in the v :.

Wicinity;of the = break,fa' d the air line may1have been moved 'somewhat to n

% 70 t accomplishithe.wrapiiilThis could-have; placed. enough'stiress on the elbow to T@ !

~ C cause;it etio separate.

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The unit;was maintained:in hot shutdown.while1 repairs;were made.-'A walkdown iinsp'ection'of thelinstrument air system was p'erformed in areas of:the plant

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Mwherescable tray; wrapping 1hadJtaken' place er was.in progress; no additional-T

. : problem: areas ~were identified. ?The unit was returned to service at 1847 on' f, ';n iMayl 9.-

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• [Plansfareibeingmadeito.upgradeLthecompressedairpipingsystems'overthe'

, :p (next-ifew;. years with higher strength materials.-

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OAs1notedfearlier, stepsLare being'taken td strengthen supervision of:

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Jconstruction craftfpersonne1 which will' reduce the probability of future

incidents of'.this nat!ure.'

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-: Concern 4 ;

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40n?Julyi26;51985, a temporaryicab1e splice in the power supply.to-LMCCLITA12 failed.by shorting 4toiground.

This fault disabled many of l

the~D-1Ldiesel generator auxiliaries. -The' fault occurred in a location-

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[where-Appendix;R work'hadLbeen done and.might b'e related to=that-y l activity.i -

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- iAn.'inve'stigation by.the. licensee /is underway.

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Page:51 Northern Stdes Pour Cornpany

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iResponse?

_ ion July-26t k Unitil wasLincreasing power following a. routine load 1 follow

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Toperation,'andl Unit 2;was atj90% powerJcoasting;down'to-refueling'.

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fAhi0800danToperatormaking< rounds $discoversdthatthe;auxiliariesto-D1

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Diesel Generator were not inLoperation.j(Investigation revealed the supply

[ breaker;to'MCC(1TAlt(which~ powers the auxiliaries for Dl; Diesel Generator)

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qwas; tripped. ;A fault;hadl occurred;in a' splice in a temporary power' supply 2to:MCC: ITAL from MCC:1Kl.

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.$PoweringLofjMCC'lTAlifromapermanentsourcehadbeen':planne'dforthe

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(following week,lso!instead?of repairing the tiemporary feed the permanent-

'* ' installation 1was1completedithatiday.

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s The ; temporary 1 power Esupply: to' MCC. ITA1: had-been ' spliced to a - temporary.

i cable fed from'MCC(1K1;sthe. splices were located on top of;the:MCC. The-J

.. < fault occurred <where:the; splice rested on;a switchgear bolt. 'It is surmised

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- - i" :that.duringfeable tray wrapping work lthefspliceiwas-steppedLon',;causingian indentation andilossTof; protective 11nsulation, eventually resulting in a 1 fault.c

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The cablS4fEultire~ suited ~in~1oss of D1 Diesel GAnerator auxiliaries. The-Psignificantlauxiliaries affected were ' generator. ventilat! ion', room ventila- -

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tion and

the clean fuel.' oil pump;=the others-were minor = keep-warm systems,'

etc. 4Dieselfgeneratorjoperability depends on none.of-these auxiliaries.-in 4

rtheishort term;'theidiese L generator would'have started and loaded as

required.-' ;In; the 'long te % without. operator action,* generator insulation -

c i may - have :' degraded since ; generator:: ventilation 'was unavailable. -It-is felt

'JthatjessonableL operasor: action in restoring power to the auxiliaries would' M

ihave^ prevented any' adverse;effact:on D11 Diesel' Generator-and operability-

, Cwould have been maintained..

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's DAs noted:earliir,: steps.are b'eingLtaken;to. strengthen l supervision of-

[ construction. craft; personnel;which'will reduce the probability of future

, - js c Jincidents.of;this nature.

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1 Concern 1

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10n August 1,'.?i9'85, breaker:228l tripped, thus disabling'certain safe-jguards' equipment momentarily. 4The: tripping might accidentally have Jbeen caused. byEconstruction activity near th'e breaker. 2 Subsequent m

l electrical; testing:of the: breaker?showed no fault conditions in'the V

ibr'eakeriitself.

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~ xf! n investigatihn by the'licenseelis_ underway.

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?Responsel

H?C iThis wasireported(as:a Nnitli LER 83-011.

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10n August 1,11985,1 Unit:_1 wa.s at'100% power, and. Unit 2 was at 83% power-in-Ecoastdown for,. refueling..!D1; Diesel' Generator was out'of1 service for-

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.. Investigation showed that

?At?1030; No.K22 control" room chiller tripped..

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J480' volt! Bus 220-Breaker 228lhad: tripped.,deenergizingimotor control

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lcentersLIT2i(which powers the control room chiller)iand'1TA2'(which powers-s P

~the~auxilissies for.D2 Diesel; Generator). At:1056 : Breaker.228 wa's reclosed,

. restoring l power /toMCC-IT2Landd1TA2.

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IBdeakert:228 wasiapparent lyj accidentally [ tripped by construction electricians -

i working -in ;the Larea.: -Breakers-ofEthis type;usually have a manual trip...

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- e 1 iblocking. device finstialled to prevent accidental ttrips such as this, but~ in lthisJcase theldeviceiwas' missing..'(The devices themselves are'quite easily S

Yr (removed (solthat; manual trip of ths bre'akers can be accomplished quickly, if

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The(significant;auxiliarie's'affected.were' generator ventilation, room

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" iventilation'and(thelclean.fuelloilopump;fthe others were minor keep-warm csystems,letc.; Dies'el' generator operabilityEdepends,on:none of these'.

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[auxil_iaries in the'shortLterm; the dieselJgenerator would have started.and i

Eloadedfas required.

Ir,ithe long term, without operator action, generator Linsulation may have' degraded eince generator ventilation'was; unavailable.-..

11t'.is' feltithat reasonable operator action:in restoring power to the

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. fauxiliaries'would"have prevented anyjadverse effect on D2 Diesel Generator

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, 'and operability.would:have~been maintained.-

[A[noted[ earlier, steps 7are.beingtaken.tostrengthen'superOision'of-

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' construction l craft personnel which will reduce;the probability of future

1. Jincidents"ofE his nature.

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iInvolved workmen were1 counseled conce'rning the'ir activitiies. ~

AnLadditional

- physicaljbarrier Vas erectedLin the work area:to. minimize the' chance of, 5:2 Irecurrence'._'A search for'a'more effective manual trip blocking" device'is

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1Please contactius if you'have anyxquestionsfrelated to our' resolution of, 1

Anis, violation orfany.of the matters'ofLeoncern.

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ys C;E,Lar on?

y y Vice1 Pres nt: Nuclear. Generation:

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• JRegional4 Administrator - III, NRC' g

- W rNRC' Resident' Inspector l

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