ML20151X955

Final Response to FOIA Request for Documents.App a Document Encl & Available in PDR

ML20151X955
Person / Time
Site:	LaSalle
Issue date:	08/02/1988
From:	Grimsley D NRC
To:	Harlow S AFFILIATION NOT ASSIGNED
Shared Package
ML20151X958	List: IA-88-362, Status Rept Evaluation of Lasalle Instability Event ML20151X955 ML20151X962 ML20151X974
References
FOIA-88-362 NUDOCS 8808260161
Download: ML20151X955 (2)

Text

U.S. NUCLEA 9 REGULATORY COMMISSION Nac5044 mioutst Nuveta s, ce m ,, ,, .. F01A-88-362

m. .e., .-- sis &oNs 7,n f# 5 RESPONSE TO FREEDOM OF X X '^^' I l '*

\e es..h INFORMATION ACT (FOIA) REQUEST g2 1800 DOCatt Nuveta Sr ur spe.com IEoutSTta Ms. Susan J. Harlow PART 1.-RECORDS RELEASED OR NOT LOCATED (See checked bonest No agency records subrect to tne request have been located.

No addnorial agency records subiect to the request have been located Agency records subiect to tPe request that are ioentded e Appenes are already avadable for pubhc espectw and copywg m the NRC Puth Document Room, 1717 H Strest, N W., Washegton, DC yy Agency records subrect to the request that are identif.ed m Append.. A are be.ng made avaasu. fo, puu.c inscecison and copyeg in the NRC Puu.c Documeri Room,1717 H Street. N W , Washegton, DC, in a folder unden the FOI A number and requester eams.

The nonpropretary verson of the proposalts) that you agreed to accept m a teiephone cor versaton uth a enomber of my staM e now becg made avadable for publec espect.on and coymg at the NRC Pwohc Document Room,1717 H Street, N W , Washegton, DC. m a folder under tNs FOIA number and requester name.

Enclosed e informaton on how you may obtae access to and the charges for copyeg records placed m tre NRC Pubbe Document Room,1717 H Street, NV' . Washegton, DC XX Agency records sobre ct to the request are enclosed Any appi<able charge for coces of the records provded and payment procedures are noted m the comments secton.

Records subi ect to the request have been referred to another Federal agencyl.est for review and d. rect response to you in www of NRC's response to the request, no further acton e becg taken on appesi tener cated PART li.A-INFORMATION WITHHELD FROM PU8LIC DISCLOSURE Certam informaton in the requested records is bemg uthheld from pubhc esclosure pursuant to the FOf A esemptons described in and for the reasons stated in Part 11 sec-tons 8, C. and D. Any released portons of the documents for which on y part of the record to beeg ethbed are being made avadable for pubhc inspecton and copyeg m the NRC Pubhc Documen* com,1717 H Street, N W., Washeg*on, DC. in a foeder under the FOiA number and requester name.

Comments The staff ras been unable to locate enclosure 2 of the status report which consisted of tutorial material on LPRM/APRM (Local Power Range Monitors and Average Power Range Monitors)instrumentationconfigurations.

8808260161 FOIA 880802 PDR PDR HARLOWBB-362 s m Arvar - Tom orvisioN os av s aNo arm f

N R C F O R M 464 3.1 o rg O

Re: FO!A.88-362 APPEN0ix A RECORDS MAINTAINEO IN THE POR UNDER THE ABOVE REQUEST NUMBER NUMBER DATE DESCRIPTION

1. 4/7/88 tiemorandum from L. E. Phillips to Mark A.

Ring, subject: NPR Input For AIT Report For LaSalle Unit 2 with attached status report. (21 pages) l

. o, .

AE00 SPECIAL ;E:T;T

"' 1 UN!I- La$r.lle ? '5PEC:A. PEPOPT NO. AE00/5C03 CCCKE' %. 50 374 OATE: June 7, 1988 t!CEN EE:

Cormenwe61 th Ecison EVAL.A'OR/ CONTACT: J.rauffron/G.Lanik I SUBJE !.

AE00 CONCERNS REGARDING THE POWEP OSCILLATION EVENT AT LASALLE 2 (BWR-5)  !

EVEh : !E: March 9,1988 1

SUPS: -

The LaSelle event involved power oscillatier.s caused by r.eutron flux / thermal hydra.lic instabilities of a magnitude that were not predicted by design unalysis, unanticipateo by the operators, anc cotentially in conflict with Generi! Cesign Criterion (GDC) 12.

!ssues als) hao prev 1nusly been resuived cc cerning stability of BWRs; and this event raises questions regarding the acc0uacy of those resolutions. ~~ y Since analyses predicted that these oscillations would not occur, little guida ce and training were pr.ovided fcr operator detection and response.

Further, operation in unsfable areas of the En power / flow map has potential adverse safety consequences. Because LaSalle 2's core was calculated to be snore stable than the typical BWR core, other BWDs may be more susceptible to this :rcolem.

r li:nt of the present uncertainties, we re:: rcnd that BWP licensees should be re:ared to implement procecures to:

a) 't.ediately insert control rods to bele. tr.e 80s rod line following

! ec.ction a

or loss of recirculation flow Or other transients which result entry into potentially unstable regt:95 cf the pcwer/ flow map, t/, :ccretse recirculatiun flow ouring rout e "eactor stdrtups ar.d irisert 5:. e control roos prior to reducing rec c.lation flow belu 50t during snutonwt.s to avoid operation in potentit'.l unstable areas of the cower / flow ra p.

l c) :7. 4diately scram the reactor if a) or t' above are not successful in

reventing and suppressino ostillations.

We also rer.omend that NRR revisit Gls B-19 and B-59 and ATWS mitigation in j light of the LaSalle operating experience.

Descr stion of the Event (Compiled from licersee's 50.72 report, March 9 TGo, anc referenTes I through 5).

While :erforming the functional test on a di"erential pressure switch, an Instr. e t maintenance technician inadvertency valved in the variable and referet:e legs with the equalizing valve oper, thereby connecting the variable and reference legs. This initiated a "presst.re equalization" between the variaMe and reference legs, and resulted in a high "indicated" level to the Opeg eno600

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-9 REFERE"?ES

1. Con?onnealth Edison Cor:1 y. LER 88-003, Docket No. 50 374, ce e: April 7, 1988.

s.

?. PHO-ill 08-18. dated Ma

.. 10, 1988.

9.

3. PN0-!!!38-18A, ca ted Pa r:5 17,1988.

h 4 PN0-Ill-88 18B, dated Par:h 25, 1983.

t-JL 5. NRR Event followup Rept : 88 03, date$ March 30, 1988. (Not a.e iable in

't POR)'

P- Percrandum from L.E. Phl'ips (HRC) to H. A. Ring (NFC), dated ':rtl 7, 6.

1988. (Not available M ~DP)

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