ML20207J552

Forwards Amend 1 to post-defueling Monitored Storage (Pdms) Sar.Amend Provides Basis for Licensee Calculated person-rem Savings for Decommissioning Following 20 Yrs of Pdms

ML20207J552
Person / Time
Site:	Three Mile Island
Issue date:	09/19/1988
From:	Standerfer F GENERAL PUBLIC UTILITIES CORP.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
4410-88-L-0151, 4410-88-L-151, NUDOCS 8809280039
Download: ML20207J552 (12)

Text

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. GPU Nuclear Corporation

', Y g gf Post Office Box 480 Route 441 South Middletown, Pennsylvania 17057 0191 717 944 7621 TELEX 84 2386 Writer's Direct Dial Number:

(717) 948-8461 September 19, 1988 4410-88-L-0151/0422P US Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

Dear Sirs:

Three Mile Island Nuclear Station, Unit 2 (TNI-2)

Operating License No. OPR-73 Docket No. 50-320 Post-Defueling Monitored Storage Safety Analysis Report Amendment 1 Attached is Amendment 1 to the Post-Defueling Monitored Storage (PDMS) Safety Analysis Report (SAR). This amendment provides the basis for the GPU Nuclear-calculated person-rem savings for decommissioning following 20 years of PDMS.

Sincerely,

/^' '? l 3s--S

i. . Stander r Director, TMI-2 EDS/ emf Attachment cc: R. J. Conte - Senior Resident Inspector, TMI W. T. Russell - Regional Administrator, Region 1 J. F. Stolz - Director, Plant Directorate IV L. H. Thonus - Project Manager, TMI Site Aco l G809280039 880919 /

PDR ADOCK 05000320 P PDC GPU Nuclear Corporation is a subsidiary of the General Pub 11c Utilities Corporation i

POST-DEFUELING MONITOREO STORAGE SAFETY ANALYSIS REPORT

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s IA.7.3 ACTIVITIES DURING PDMS m

f Work performed in radiation areas during PDMS includes maintenance in the L Reactor Building and in the AFHB, surveys and inspections in these facilities and radioactive waste processing.

lA.8 JOB-HOUR EST. DATES The most comprehensive study pertaining to the work scope and approach for decontamination activities is the DTFR which defines decontamination tasks

.- necessory~ tW~~actilev'e' the Phase III endpoint criteria, along with the associated job-hours required to cornpla ce these tasks. The information presented in Reference 2, categorized by Reactor Building and AFHB activities, assumes 3 years to complete the decontamination tasks.

The OTFR is used as the basis for the job-hour estimates for this present evaluation as many of the tasks specified in the report will also be required i

for future decontamination. However, the total number of hours required to reach the base case criteria from current or Phase !!! endpoint conditions will differ from those listed in the DTFR, and no time dependence is assumed for reducing the dose rates to the base case criteria. In addition, the hours i

developed in the report were initially used for budget purposes and hence were billable hours (i.e., total hours committed) rather than an estimate of the actual hours spent in a radiation fleid. Therefore, the job-hour estimates in the DTFR were modified for this evaluation. This modification considers:

<

• The difference in scope between the DTFR estimates and the Post-Phase III required additional decontamination; and i d

• The fraction of the total job-hours that will be spent in radiation l

areas. .

Table IA-7 lists the estimated job-hours that will be spent in radiation fields, using the categories in the DTFR, with the DTFR total job-hours included for comparison. The radiation area job-hours are given for three cases: 1) immediate additional decontamination following Phase III; 2) final decontamination as a part of decommissioning following 20 years of PDHS (the Reference 1 base case); and 3) final decontamination as a part of decommissioning following 30 years of PDHS (the base case assum2d in this SAR). These categories were expanded for this evaluation, as shown in Table

! 1A-S. The job-hours assumed for each of these categories are also listed.

4 Previous history has shown that person-rem attributable to health physics support is a percentage of total person-rem, therefore no job-hours are listed for this task.

j 1A.8.1 SCOPE M00!FICATIONS Identified modifications to the work scope are used to estimate the change in i total job-hours based on a change in the desired endpoint of the tasks or a change in the decontamination program starting point.

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TABLE 1A-7 RADIATION AREA JOB-HOURS

[U OTFRI TOTAL RADIATION AREA JOB-HOURS 2 TASK OESCRIPTION JOB-HOURS Post-Phase III Post-POMS 20-Year PDMS 30-Year PDMS

1. RB Characterization 6,400 1,280 1,280 1,280

2. RB Visual Survey 21,060 421 421 421

3. Studge & Core Bore Visual 13,330 200 20 20

4. RB Decon/ Dose Reduction 24,320 4,864 3,405 2,432

5. RB Decon Halntenance 69.680 13.936 9,755 6,968

6. Desludge RB Basement 63,650 9.548 9,548 9,548

7. Decon D Rings Above 282' 37,120 14,848 12,992 11,136

8. RB Basement Recovery 114,610 51,575 42,979 34,383

9. Establish HVAC Control 104,250 0 0 0

10. Decon 347' and above 190,320 38,064 26,645 19,032

11. Decon 305' and above 190,320 38,064 26,645 19,032

12. Robotics 22,880 0 0 0

13. Non RCS Systems Decon 119,600 2,392 2,392 2,392

14. RCS System Decon 13.360 267 267 267

15. Site Engineering 76,190 3,810 3,810 3,810 SUBTOTAL 1,067,090 179,268 140,158 110,720 AFHB O 1. AFHS Characterization 45,760 686 686 686 h 2. Decon Maintenance 109.200 2,730 1,538 546

3. Tech Spec 106,080 0 0 0 Decontamination

4. AFHB Cubicle Decon 291,200 14,560 10,192 7,280

5. Systems Characterization 27,040 406 243 81

6. Non RCS Systems Decon 239,200 2,392 1,196 239

7. Site Engineering 55,640 139 28 28 SUBTOTAL 874,120 20,913 13,984 8,861 j TOTAL 1,941,210 200,181 154,141 119,581 a

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NOTES:

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1. OTFR - Decontamination Task Force Report

< 2. Post-Phase !!! - 1 mediate additional decontamination Post-PONS - Final Decontamination as a part of decommissioning 1A-26 AM. 1 - SEPTEMBER 1988

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