ML20209G941

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Rev 0 to Technical Bulletin TB 86-36, Characterization of Sediment on Reactor Bldg Basement Floor
ML20209G941
Person / Time
Site: Three Mile Island Constellation icon.png
Issue date: 08/21/1986
From: Eidam G, Fillnow R, Wood H
GENERAL PUBLIC UTILITIES CORP.
To:
Shared Package
ML20209G934 List:
References
TB-86-36, TB-86-36-R, TB-86-36-R00, NUDOCS 8609150109
Download: ML20209G941 (4)


Text

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TB 86-36 REV. 0

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DATE 8/21/86 TMI-2 TECHNICAL BULLETIN PAGE 1 0F 2

SUBJECT:

CHARACTERIZATION OF SEDIMENT ON REACTOR BUILDING BASEMENT FLO_0R

REFERENCES:

1. GEND-042. October 1984. TMI-2 Reactor Building Source Term Measurements.
2. GPUNC Memorandum and attached Agenda of November 20, 1985 from G. Cremeans to Meeting Attendees. " Sludge Removal Program Open Issues." 4341-85-068.
3. GPUNC Memorandum of July 11, 1986 from P. Bengel to G. Eidam.

" Standardization of Reactor Building Basement Sediment Volume Estimate."

4320-86-0445.

4. GPUNC Calculation No. 4320-4340-86-036. June 20,1986. " Sludge Mass on Reactor Building Basement Floor."
5. GPUNC Memorandum of December 5,1986 from K. Hofstetter to G. Eidam.

" Analyses of Reactor Building Sludge Samples." 4240-85-0427.

6. Technical Bulletin. January 14,1986. "Robotic Sediment Sampling." TB-85-35, Rev. 1
7. Technical Bulletin. May 13,1985. " Reactor Building Basement Fuel Es timate. " TB-85-08, Rev. 1 ii SUMMRY:

Several estimates of the mass of sediment on the reactor building basement floor were combined and averaged to provide a single value that is considered to be the most accurate currently available. In addition, the wet sediment density, fuel content, and curie values for Cs-137 and Sr-90 have been derived (directly or extrapolated) from existing data (Reference 1).

Average Sediment Total Mass from Recent Samples 1.5 x 107 gm Wet Sediment Density 1.03 gm/ml Total Fuel Content in Sediment 1.7-3.2 kg as U02 Cs-137 1540-2540 Ci Sr-90 654-687 Ci PREPARED BY: /h'/bl.

H. P. Wood Phi /4 8720 APPROVED BY: du G.-~R

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TB 86-36 REV. 0 DATE 8/21/86 TMI-2 TECHNICAL BULLETIN pAGE 2 0F 2 DISCUSSION: -

Three recent calculations have been made of the mass of sediment on the reactor building basemont floor. The calculations were based upon reasoned assumptions and interpretations of video tapes taken during remotely controlled reconnaissance vehicle surveys of accessible basement areas. The bulk of the sediment was found to be concentrated in the impingement area; fuel and associated fission products were more uniformly deposited as determined by sampling and area gamma surveys.

The mass projections, as noted below, lie within a narrow range.

Site Engineering - 1.47 x 107 gm (corrected to a density of 1.03 gm/ml, Reference 2)

Decon. Planning - 1.58 x 107 gm (derivgd from a reported volume Cf 540 fta at a density of 1.03 gm/rr1, Reference 3)

Data Management - 1.43 x 107 gm (note calculations, Reference 4)

Average Value 1.5 x 107 The calculations are summarized and referenced to supporting documents in Table 1.

Since not all basement areas have been sampled or inspected by remotely controlled video equipment, it was necessary to infer appropriate volumes and analytical information. The results obtained are not uniformly firm and factual, but can be considered the best available. This bulletin will be updated as more information is obtained.

IMPLICATIONS & USE:

The sediment characterization noted is based on the most credible data at hand and is recommended for use in planning. It should be used carefully in recognition of some basic uncertainties in source information.

ATTACHMENTS:

Table

1. Characterization of Reactor Building Floor Sediment Figure
1. Reactor Building Basement Zones / Areas Doc. Id. 0336V i[CII!Cai IItttIIIS SIE IS$8tl If IIE PIOJECI PitIIIIG AII 11011515 IEP8BIIEIf 10 QE!CItf Costilltall IECalltet IIF0 bit 1105. IIE IIF0 bit 110E IS COE110Lt!I SII VILL It IPIt1EI esI/0E IIcotroteitl IIIe Feelet 13CIIII15 es APPIOPIIsit.

- . ~ - -

' TABLE 1 TB-86-36 .

CHARACTERIZATION OF REACTOR BUILDING BASEMENT FLOOR SEDIMENT .,

08/20/86 I FUEf. Cs-137 S r-9(I ANALYSIS CONTENT ANALYSIS CONTENT SEDIMENT J

MASS (gm) ANALYSIS CONTENT (Kg) (pCi/p) (pCi) (pCi/p) (pCi)

BASEMENT LOCALE 0.2-1.4 x 10-1 15 - 30 (5) 10-20 x 108 7 - 12 (6) 4.7-8.0 x 107

! Impingement Area 6.7 x 106(1)16-140 gm in gen'1.

l imping area (5) 2.6 x 10-1 1.1 x 103 (3) 1.4 x 108 1.7 x 103 (3) 22 x 107 D-rings 1.3 x 105 (2) 2.0 mg/gm (3)

Covered Hatch Area 1.8-2.4 gm/ft 2 from 0.9 - 1.2 1.0 x 103 (2) 1.9 x 107 3.5 x 103 (3) 6.6 x 107 RCDT Dischg. Area 0.2 x 105(2) Open Stairwell Open Stairwell .

TB-85-8 (0) 1.2 x 10-1 54 (2) 3.2 x 10 7 150 (2) 9.0 x 10 7 j Sump 6.4 x 105 (2) 0.2 mg/gm (3) 1.1 x 10 3 (3) 2.1 x 10 7 1.7 x 103 (3) 3.2 x 10 7 Incere Area 0.2 x 105 (4) From TB-85-8 (1) 0 - 1.1 1.6 x 10-I 3.6 x 103 (2) 2.6 x 108 1.2 x 103 (2) 8.7 x 107 Enclosed Stairwell 0.7 x 105 (2) 2.2 mg/gm (2) Covered Hatch Area Arsa Covered Hatch Area Covered Hatch Area 0.6 x 10-1 30 (2) 5.7 x 105 84 (2) 0.2 x 107 LS:k Cooler Area 0.2 x 105 (2) 3.0 mg/gm (2)

Penetr. 225 Penetr. 225 Penetr. 225 l

1.3 x 10-I 1.1 x 103 (3) 7.0 x 10 7 1.7 x 103 (3) 11.0 x 107

] Remaining Area 0.6 x 105(2) 2.0 mg/gm (3) j 1.7 - 3.2 Kg 1540-2540 Ci 654 - 687 Ci Totals i

1984.

a (1) Mass calculations based on sediment sampling in Nov., 1985 and R9V video surveys made during 3rd Q.

(2) Mass estimates and analyses taken f rom data presented in GEND-042. Table 6. Reference 1.

j (3) Analyses from GEND-042 Table 6, averaged for use in preparation of above table. Reference 1.

' (4) Sludge Removal Program, 4341-85-068, 11/20/85, with table attached. Reference 2.

i (5) Data f rom TB-85-35 Table 1, Ref erence 6.

(6) Hofstetter Memo, page 2, item 5. Reference 5. I 1517B PP

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