ML20132B600

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Forwards Memo,Prepared for Signature,Authorizing USGS to Commence Phase II of Analysis of Potential Flood Levels at Trojan Nuclear Power Plant, Due to Spirit Lake Debris Dam Failure.Statement of Work Encl
ML20132B600
Person / Time
Site: Trojan File:Portland General Electric icon.png
Issue date: 07/12/1983
From: Ballard R
Office of Nuclear Reactor Regulation
To: Vollmer R
Office of Nuclear Reactor Regulation
Shared Package
ML19264D658 List:
References
CON-FIN-B-8649, FOIA-85-353 NUDOCS 8307220608
Download: ML20132B600 (9)
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. 1 O W, UNITED STATES j y .; NUCLEAR REGULATORY COMMISSION j WASHINGTON, D. C. 20555

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,j r i MEMORANDUM FOR: Richard H. Vollmer, Director i Division of Engineering

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THRU: William V. Johnston, Assistant DJ e6to [

Materials, Chemical & Environme a chnology Division of Engineering FR0fi: Ronald L. Ballard, Chief Environmental & Hydrologic Engineering Branch Division of Engineering

SUBJECT:

" ANALYSIS OF P0TENTIAL FLOOD LEVELS AT THE TROJAN i NUCLEAR POWER PLANT - PHASE II" The attached memorandum, prepared for your signature, autho'rizes the USGS to commence Phase II of their analysis of potential flooding at the Trojan site as a result of the Spirit Lake debris dam failure.

Mike Fliegel, Dick Codell, and I have reviewed the USGS's written report (Attachment 2) and conversed with the authors by telephone. Based on -

their initial assumptions, the USGS Phase I effort conclud6d that: '

l. A " clear water" flood alone would not flood the site.

Taking the physical properties of the mud into account, however, the dam break could cause a flood in excess of 45 feet mean sea level at the site if it occurred coincident with a major Columbia River flood (e.g., 50 year recurrence).

2. A Spirit Lake dam failure during low water flow on the Columbia River could deposit large quantities of mud at the mouth of the Cowlitz River. Large winter floods have been known to follow low flow periods by only a few days. This scenario could cause a flood above plant grade even..for a relatively frequent (2 year) Columbia River flood.

Phase II of this study would investigate refined models for the deposition of sediment in the Toutle and Cowlitz Rivers, which would be expected to -

reduce the predicted load to the Columbia River. The study would also investigate the slope of mudf1 w in um Cal bia River.

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Richard H. Vollmer - JUL 1 Z 1983 The licensee, PGE, transmitted to NRC an independent assessment, dated i

July 1,1983, of potential mudflows and resulting effects at the Trojan site (Attachment 3). Their assessm:nt, using somewhat different assumpt.iuns, i* concluded that flooding at Trojan is not credible (maximum water level of 39 feet). As the report is deficient of cupporting documentation, we are

.; preparing questions to elicit the needed information for our review.

However, as we do not have the required skills to authoritatively review

, their analysis, we would almost certainly require outside assistance; '

5 probably the USGS.

4 Taking all matters into consideration, including the proposed Trojan start-up of mid-July and projected August request for spent fuel pool expansion, it appears to be in NRC's best interest to proceed with the Phase II . study. At the same time, they will have the opportunity to review the licensee's analysis. Thus, we recomend that you approve the j conduct of Phase II by means of the attached memorandum.

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Ronald L. Ballard, Ch'ief Environmental & Hydrologic Engineering Branch Division of Engineering Attachaents: 2 As stated ~

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MEMORANDUM FOR: Edward L. Halman, Director

I' Division of Contracts, ADM o

$ FROM: Richard H. Vollmer, Director l Division of Engineering, NRR

SUBJECT:

REQUEST FOR PROCESSING OF AN NRR PROCUREf1ENT ACTION; RFPA NO.: NRR-83-109 i

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Title:

Analysis of Potential Flood Levels at the Trojan Nuclear Power Plant - Phase II a

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l FIN No.: 88649 The attached request for Procurement Action (RFPA), NRC Fonn 400, Parts 1 and 2, is forwarded for your action. This RFPA requests that incremental funds be provided to complete Phase II of the project. The initial request for Phase I was forwarded to you in my memorandum of May 27, 1983. -

If you have any questions concerning acceptan:e and processing of this request, please contact Mr. E. Pentecost, extension 27067. ~

Richard H. Vollmer, Director i Division of Engineering

Office of Nuclear Reactor Regulation Attachments

As stated 4

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3. TYPE OF ACYlON REQUESTED (Che.A arNr e elete es empr.Prietes c

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Analysis of Potential Flood Levels at the Trojan Nuclear Power Plant - Phase II.

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! To determine the potential flood levels at the Trojan Nuclear Power Plant site

based upon hypothetical failure of the Spirit Lake Blockage.

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9 PSOGRAM OFFICE RECOMMENDATION DEGARDING SOClO ECONOMac SET ASIDES tcerasiete where act.en reevested.n J. see e es for a connper.#, e soweret,ea a ees.e ereer,ap sesca t er e netwomerno.r e e.ntract t 100% SET.ASIDE FOR SMALL SU$iNESS PARTIAL $ET.ASIDE FOR SMALL BU$tNE55 '\

JOINT SMALL RU$iNESS-LABOR SURPLUS ARE A SET AsiDE 100% LA80R SURPLUS ARE A 5EY A$iDE

  • NONCOMPE fiTivF CONTRACT PROCE!$EO UNDER THE PPOCEDURES OF SECTION 8 ai O8 UNRE STRICTE D ACDON l THE SMALL BUSNE55 ACF F081 AWARD TO A $ MALL DISADVANT AGED SU$4NE15 X

10 MAN AGEMENT O'RECYivES APPLICABiUTV DE SCRIPTsON APPLIC ABL E IN A PPp* A BL E 4 E k[VeTION N W es g OY8 CIRCULAR A 76 (See N9C d=**a Stes is AUTOuAT'C DATA PROCES$rNG COOR0sNADON (See NACM 0904 enn knc evoorran 2 tor.1$>

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4 REQUEST FOR PROCUREMENT ACTION (RFPA)

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sPECIAL REOulREMENTS (Jn A@C Appead,e Si07. (ah 6,e F. Pepe $f 1

CONTROLLER's APPROVAL OF A.76 DETERMINATION

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1 AMou=T NAME OF CERTiFviNo OFFICIAL rtr eeseass,, age oATE 520,000 Bernard L. Grenier, Technical Assistance Program fianager, NRR

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a 20-19-10-12-2 $40e000 B8649 S40.0Q0 31X0200m2J13

.. ,eoaci 0,,,cE R s he ME p AIL sTO,  ; mEracNE Nuseum Richard Codell P-314 492-8117

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Richard H. Vollmer Director ORGANi2AfiON Division of Engineering (

if REMAR s . L This RFPA provides incremental funds for authorization of work in accordance with the enclosed SOU.

The staff exercises its option to perform Phase II of this project, and authorizes the balance of the $60,000 allocated for FY 83 ($40,000). The staff's decision to commence Phase II is based on the results of the Phase I study contained in the USGS letter report on Phase I (Laird to Ballard, June 20, 1983), and telephone discussion with the USGS staff.

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STATEMENT OF WORK l

1 ii Ti tle: Analysis of Potential Flood Levels at the Trojan Nuclear Power '

.. Plant . .

q FIN No.: B8649 1

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. B&R No.: 20-19-10-12-2 .

9 h Project Officer: Richard Codell (FTS 492-8117)

I j BACKGROUND , ,

1

! The U. S. Geological Survey (USGS) has recently released a draft report describing the postulated down stream effects of a hypothetical failure

.t of the debris dam (blockage) impounding Spirit Lake. This 1983 report i (Water-Resources Investigations 82-4125) prepared in cooperation with

! the Federal Emergency Management Agency, is entitled "Mudflow hazards

, along the Toutle and Cowlitz Rivers from a hypothetical failure of

, Spirit Lake blockage." The scope of the above report was limited to the confluence of the Cowlitz and Columbia Rivers and does not consider the effect on the Columbia itself.' The effects of the hypothetical mudflow at the location of the Trojan Nuclear Power Plant, some 5 miles .

upstream on the Columbia River from that confluence was .not addressed in the USGS report. Considering the potential flood hazard posed by the hypothetical failure of the Spirit Lake blockage, the U. S. Nuclear Regulatory Commission must determine the potential flood levels at the Trojan Nuclear Power Plant due to the mudflow described in the early 1983 USGS Spirit Lake blockage report. -

OBJECTIVE The objective of this report is to determine the potential flood levels at the Trojan Nuclear Power Plant based upon the hypothetical failure

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of the Spirit Lake blockage.

WORK REOUIREMENTS .

Work under this project will be performed in two phases where phase II will be performed as an option, dependent on the results obtained in phase I. C < .

Estimated Completion from Phase I Initiation of Phase Using the results of the USGS Water- 2 weeks Resources Investigations Report ,

82-4125 on mudflows entering the Columbia River from the Cowlitz River, determine the maximum flood elevation .

at the location of the Trojan Nuclear Power Plant using appropriate conservative 'I USGS hydrological modeling techniques and ,

assumptions.

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Estimated Completion from

] Intttation of Phase Phase II (Option) y

, If the results of Phase I show that flood 3 weeks elevations at Trojan are above 4S ft, msl, i perform additional hydrological analysts -

i but using progressively more realistic 4 model assumptions based upon USGS engineering judgements concerning the tributary and ~

Columbia River routined models. ,

LEVEL OF EFFORT AND PERIOD OF PERFORMANCE j The level of effort is estimated at 0.5 professional staff years over

] a.2 month period; 0.15 psy for Phase I and 0,35 psyTor Phase II, J

REPORTING REQUIREMENTS -

] 1. One week after completion of Phase I, a letter report is to be submitted to the Project Officer that contains an estimate of the flood level at the Trojan site including a summary ofthe analyses perfo,rmed and assumptions used, .

2. One week after completion of Phase II, a ' letter report is to be submitted to the Project Officer that contains a summary of the analyses performed, the assumptions.used and the results obtained concerning the flood levels at the Trojan site. ,
3. A busines's letter report is to be submitted at the completion of the project to the Project Officer with copies provided to the Contracting Officer, DC, the Director, Division of Engineering, ATTN: E. Pentecost, to R. Ballard, DE, and to B. L. Grenier, ~

NRR that contains a' brief summary of the work performed, problems encountered, if any; the amount of professfonal staff years expended; and the amount of funds expended in the accounting categories used by the USGS. The report will identify the Interagency Number, the FIN No., the Princiapal Investigator end the period of performance.

' MEETINGS AND TRAVEL' 0,n,e two person trip to Bethesda, MD to discuss the results of the analyses.

Travel to Bay St. Louis, Mississippi is anticipated to perfom the analyses i

and should be described as part of the USGS proposal.

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.i Estimated Completion from Initiation of Phase Phase II (Option)

, If the results of Phase I show that flood 3 weekg elevations at Trojan are above 45 ft. ms1,

! perform additional hydrological analysis j but using progressively more realistic ,

l model assumptions based upon USGS engineering

i judgements concerning the tributary and Columbia River routined models, *

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LEVEL OF EFFORT AND PERIOD OF PERFORMANCE -

The level of effort is estimated at 0,5 professional staff years over 1

a 2 month period; 0.15 psy for Phase I and 0,35 psy'for Phase II, '

REPORTING REQUIREMENTS -

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1. One week after completion of Phase I, a letter report is to be submitted to the Project Officer that contains an estimate of the flood level at the Trojan site including a summary of'the analyses perfo,rmed and assumptions used, .
2. One week after completion of Phase II, a letter report is to be submitted to the Project Officer that contains a summary of the analyses performed, the assumptions used and the results obtained concerning the flood levels at the Trojan site.
3. A business letter report is to be submitted at the completion of the project to the Project Officer with copies provided to the Contracting Officer, DC, the Director, Division of Engineering, ATTN: E. Pentecost,' to R. Ballard, DE, and to B. L. Grenier, NRR that contains a brief summary of the work performed, problems encountered, if any; the amount of professional staff years expended; and the amount of funds expended in the accounting categories used by the USGS. The report will identify the Interagency Number, the FIN No., the Princiapal Investigator and the period of performance.

1 MEETINGS AND TRAVEL ~ '

One two person trip to Bethesda, MD to discuss the results of the analyses. ,

L Travel to Bay St. Louis, Mississippi is anticipated to perfonn the analyses 2 and should be described as part of the USGS proposal, q

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